Hydrologic Soil Group —Riverside County, Coachella Valley Area, California (Skilled Nursing Facility)
MAP LEGEND MAP INFORMATION
Area of Interest ( AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
ND
B/D
C
LJ C/D
D
Not rated or not available
Soil Rating Line s
. r A
..r ND
,ry B
B/D
. 0 C
C/D
D
r Not rated or not available
Soil Rating Points
A
▪ ND
■ B
▪ B/D
▪ C/D
D
▪ Not rated or not available
Wat er Feature s
Str eams and Canals
Tr ansportatio n
+-a-+ Rails
Int erstate Highways
US R outes
Major Roads
Local Roads
Background
® Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale .
Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. Th e m aps do not sh ow th e small areas of contrasting soils that could have been sh own at a more detail ed scale.
Ple ase rely on the bar scal e on each map sh eet f or map measurem ents.
Source of Map: Natural Resources Conservation Service
Web S oil Survey URL:
Coordinate System: W eb Mercator (EPSG:3857)
Maps from the W eb Soil Surv ey are based on the W eb Merc ator projection, which preserves direction and shape but distorts distance and area. A projecti on that preserves ar ea, such as the Alb ers equal-area conic projection, should be used if more accurate calculati ons of distanc e or are a are required.
This product is generated from the USDA-NRCS certified data as of the v ersi on d ate(s) list ed b elow .
Soil Survey Area: Riverside County, Coach ella Valley Area, California
Survey Area Data: Version 14, Sep 1, 2022
Soil map units are labeled (as space allows) for map scales 1:50,000 or larger .
Date(s) aerial images were photographed: Mar 15, 2022 —May 28, 2022
The orthophot o or other b as e map on which the soil lines w ere compiled and digitiz ed probably differs from the background imag ery displayed on these maps. As a result, some minor shifting of map unit b oundaries may be evid ent .
USDA Natural Resources
Conse rvation Service
Web Soil Survey
National Cooperative Soil Survey
9/29/2023
Hydrologic Soil Group —Riverside County, Coachella Valley Area, California Skilled Nursing Facility
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
MaD
Myoma fine sand, 5 to A
15 percent slopes
Totals for Area of Interest
Description
6.6 6.6
Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
100.0%
100.0%
USDA Natural Resources Web Soil Survey 9/29/2023
Conservation Service National Cooperative Soil Survey Page 3 of 4 11-682
Hydrologic Soil Group —Riverside County, Coachella Valley Area, California Skilled Nursing Facility Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 9/29/2023
Conservation Service National Cooperative Soil Survey Page 4 of 4 11-683
APPENDIX E
NOAA PRECIPITATION DATA
RCFC&WCD HYDROLOGY MANUAL - PLATES E-6.1 & E-6.2
www.mbakerintl.com
75-410 Gerald Ford Drive., Suite 1001 Palm Desert, CA 92211 Office: 760-346-7481
11-684
NOAA Atlas 14, Volume 6, Version 2
Location name: Rancho Mirage,
California, USA*
Latitude: 33.7881°, Longitude:
-116.4051°
Elevation: 312 ft**
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan
NOAA, National Weather Service, Silver Spring, Maryland PF_tabular I PF graphical I Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years)
Duration
1 2
5 10
25 50 100
200 500
1000
5 -min
0.062
(0.052-0.075)
0.097
(0.081-0.118)
0.151
(0.126-0.184)
0.203
(0.167-0.249)
0.285
(0.227-0.362)
0.360
(0.280-0.467)
0.447
(0.340-0.595)
0.552
(0.407-0.755)
0.723
(0.511-1.03)
0.978
(0.668-1.45)
10 -min
0.089
(0.074-0.108)
0.139
(0.116-0.169)
0.217
(0.180-0.264)
0.290
(0.239-0.356)
0.409
(0.325-0.519)
0.516
(0.402-0.669)
0.641
(0.487-0.853)
0.791
(0.584-1.08)
0.957
(0.706-1.31)
1.50 (1.11-2.06)
1.04 (0.733-1.48)
1.40 (0.957-2.07)
15 -min 0.108
(0.090-0.131)
0.169
(0.140-0.205)
0.262
(0.218-0.319)
0.351
(0.289-0.431)
0.494
(0.393-0.627)
0.624
(0.486-0.809)
0.776
(0.589-1.03)
1.25 (0.886-1.79)
1.70 (1.16-2.51)
30 -min
0.169
(0.141-0.205)
0.265
(0.220-0.321)
0.412
(0.342-0.502)
0.552
(0.454-0.677)
0.776
(0.617-0.985)
0.979
(0.763-1.27)
1.22 (0.925-1.62)
1.97 (1.39-2.81)
2.66 (1.82-3.94)
60 -min
0.245
(0.204-0.297)
0.382
(0.318-0.464)
0.596
(0.494-0.725)
0.797
(0.656-0.978)
1.12 (0.892-1.42)
1.42 (1.10-1.84)
1.76 (1.34-2.34)
2.18 (1.66-2.90)
2.17 (1.60-2.97)
2.84 (2.01-4.06)
3.84 (2.63-5.69)
3.94 (2.69-5.83)
4.36 (2.98-6.44)
2 -hr 0.345 0.530
(0.287-0.418) (0.441-0.643)
0.806
(0.669-0.981)
1.06 (0.872-1.30)
1.24 (1.02-1.53)
1.45 (1.15-1.84)
1.79 (1.40-2.33)
2.63 3.31
(1.94-3.60) (2.34-4.73)
3 -hr
0.414
(0.345-0.502)
0.633
(0.527-0.767)
0.954
(0.792-1.16)
1.69 (1.34-2.14)
2.07 (1.61-2.68)
2.49 (1.89-3.32)
3.24 (2.46-4.31)
3.96 (3.01-5.27)
4.78 (3.88-6.02)
2.98 (2.20-4.07)
3.83 (2.83-5.24)
4.69 (3.46-6.41)
3.71 (2.62-5.29)
6 -hr
0.563
(0.470-0.683)
0.857
(0.713-1.04)
1.28 (1.06-1.56)
1.66 (1.37-2.04)
2.23 (1.77-2.83)
2.71 (2.11-3.51)
4.72 (3.34-6.74)
5.47 (3.74-8.10)
12 -hr
0.679
(0.566-0.823)
1.04 (0.868-1.26)
1.57 (1.30-1.91)
1.87 (1.65-2.17)
2.03 (1.67-2.49)
2.44 (2.13-2.84)
2.73 (2.17-3.46)
3.32 (2.58-4.30)
5.76 (4.08-8.23)
6.68 (4.56-9.88)
24 -hr
0.794
(0.703-0.916)
1.24 (1.09-1.43)
3.28 (2.78-3.95)
4.00 (3.32-4.91)
5.66 (4.47-7.32)
6.98 (5.29-9.39)
7.78 (5.90-10.5)
8.10 (5.94-11.3)
9.00 (6.60-12.5)
2 -day
0.885
(0.783-1.02)
1.39 (1.22-1.60)
2.11 (1.86-2.44)
2.74 (2.40-3.20)
3.69 (3.13-4.44)
4.49 (3.72-5.51)
5.36 (4.35-6.74)
5.66 (4.59-7.12)
6.33 (5.00-8.19)
6.68 (5.27-8.64)
3 -day 0.928
(0.822-1.07)
1.46 (1.29-1.68)
2.22 (1.96-2.57)
2.89 3.89
(2.53-3.38) (3.30-4.69)
4.73 (3.93-5.82)
8.20 (6.22-11.0)
9.49 (6.96-13.2)
4 -day
0.956
(0.847-1.10)
1.50 (1.33-1.74)
2.30 (2.02-2.66)
2.99 (2.62-3.49)
4.03 (3.41-4.85)
4.90 (4.07-6.02)
5.85 (4.75-7.36)
6.91 (5.46-8.94)
8.48 (6.43-11.4)
9.81 (7.20-13.7)
7 -day
1.02 (0.907-1.18)
1.62 (1.44-1.87)
2.48 (2.19-2.88)
3.24 (2.84-3.78)
3.44 (3.01-4.01)
3.82 (3.34-4.45)
4.37 (3.70-5.27)
5.32 (4.41-6.53)
6.35 (5.15-7.99)
7.49 (5.91-9.68)
9.18 (6.96-12.3)
10.6 (7.77-14.7)
10 -day
1.08 (0.954-1.24)
1.71 (1.52-1.98)
2.63 (2.32-3.04)
4.64 (3.93-5.59)
5.64 (4.69-6.94)
6.74 (5.47-8.48)
7.56 (6.13-9.52)
7.95 9.75
(6.28-10.3) (7.39-13.1)
11.3 (8.25-15.7)
20 -day
1.17 (1.04-1.35)
1.88 (1.66-2.17)
2.91 (2.56-3.37)
5.18 (4.39-6.23)
6.32 (5.24-7.76)
8.94 (7.06-11.6)
11.0 (8.32-14.8)
12.7 (9.30-17.6)
30 -day
1.31 (1.16-1.51)
2.11 (1.86-2.43)
3.27 (2.88-3.78)
4.31 (3.77-5.02)
5.86 (4.97-7.06)
7.17 (5.96-8.81)
8.60 (6.98-10.8)
10.2 (8.04-13.2)
12.5 (9.50-16.9)
14.5 (10.6-20.2)
45 -day
1.43 (1.26-1.64)
2.31 (2.04-2.66)
3.60 (3.18-4.17)
4.76 (4.17-5.56)
6.52 (5.52-7.85)
8.01 (6.65-9.84)
9.64 (7.81-12.1)
11.4 (9.03-14.8)
14.1 (10.7-19.0)
16.3 (12.0-22.7)
60 -day
1.55 (1.37-1.78)
2.51 (2.22-2.89)
3.93 (3.46-4.54)
5.21 (4.56-6.08)
7.15 (6.06-8.61)
8.80 (7.31-10.8)
10.6 (8.62-13.4)
12.6 (9.98-16.3)
15.6 (11.8-21.0)
18.1 (13.3-25.2)
It Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). 11-685
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAAAtlas 14 document for more information.
Back to Top
PF graphical
PDS-based depth -duration -frequency (DDF) curves
Latitude: 33.7881 Longitude: -116.4051°
17.5 15.0
2 ▪ 12.5
a
0J
▪ 10.0
▪ 7.5
5.0 2.5
0.0 17.5
15.0 7.5
.Q
5.0 0_
2.5 0.0
1 2
5 25 50 100 200
NDAA Atlas 14, Volume 6, Version 2
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Duration
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1 b r0 no
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tv rh'' A
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Average recurrence interval (years)
500 1000
: eaked (GMT): Fri Sep 23 15:53:51 2023
Back to Top
Maps & aerials
Small scale terrain
Average recurrence
interval
(years)
1 2
5 10
25 50
100
200
500
1000
Duration
— 5 -min — 2 -day
— 10 -mm — 3 -day
15 -min — 4 -day
— 30 -min — 7 -day
— 60 -min — 10 -day
— 2 -hr — 20 -day
— 3 -hr — 30 -day
— 6 -hr — 45 -day
— 12 -hr — 60 -day
— 24 -hr
11-686
r..-, mon Rd
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.ity°
,Thousand Palms
3km
2mi
Large scale terrain
Lancaster
•
Palmdale t,ictarsille
?S * Angeles River side t+ ffp n',a,�,e,
•
Beach Anaheim Cathedral Ci r I"
S ante Ana' Palm Desertr Indio
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Murrieta
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60mi
Large scale aerial
Yuma
11-687
Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: [email protected]
Disclaimer
11-688
RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL -COVER COMPLEXES FOR PERVIOUS AREAS -AMC II Cover Type (3)
Quality of
Soil Group
Cover (2)
A
B
C
D
NATURAL COVERS -
Barren
78 86
91 93
(Rockland, eroded and graded land)
Chaparrel, Broadleaf
Poor
53 70
80 85
(Manzonita, ceanothus and scrub oak)
Fair
40 63
75 81
Good
31 57
71 78
Chaparrel, Narrowleaf
Poor
71 82
88 91
(Chamise and redshank)
Fair
55 72
81 86
Grass, Annual or Perennial
Poor
67 78
86 89
Fair
50 69
79 84
Good
38 61
74 80
Meadows or Cienegas
Poor
63 77
85 88
(Areas with seasonally high water table,
Fair
51 70
80 84
principal vegetation is sod forming grass)
Good
30 58
72 78
Open Brush
Poor
62 76
84 88
(Soft wood shrubs - buckwheat, sage, etc.)
Fair
46 66
77 83
Good
41 63
75 81
Woodland
Poor
45 66
77 83
(Coniferous or broadleaf trees predominate.
Fair
36 60
73 79
Canopy density is at least 50 percent)
Good
28 55
70 77
Woodland, Grass
Poor
57 73
82 86
(Coniferous or broadleaf trees with canopy
Fair
44 65
77 82
density from 20 to 50 percent)
Good
33 58
72 79
URBAN COVERS -
Residential or Commercial Landscaping
Good
32 56
69 75
(Lawn, shrubs, etc.)
Turf
Poor
58 74
83 87
(Irrigated and mowed grass)
Fair
44 65
77 82
Good
33 58
72 79
AGRICULTURAL COVERS -
Fallow
76 85
90 92
(Land plowed but not tilled or seeded)
R C F C a W C D
RUNOFF INDEX NUMBERS
'HYDROLOGY MANUAL
FOR
PERVIOUS AREAS
1PIATb n (I of 2)
RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL -COVER COMPLEXES FOR PERVIOUS AREAS -AMC II Cover Type (3)
Quality of
Soil Group
Cover (2)
A
B -
C
D
AGRICULTURAL COVERS (cont.) -
Legumes, Close Seeded
Poor
66 77
85 89
(Alfalfa, sweetclover, timothy, etc.)
Good
58 72
81 85
Orchards, Deciduous
See
Note
4 (Apples, apricots, pears, walnuts, etc.)
Orchards, Evergreen
Poor
57 73
82 86
(Citrus, avocados, etc.)
Fair
44 65
77 82
Good
33 58
72 79
Pasture, Dryland
Poor
67 78
86 89
(Annual grasses)
Fair
50 69
79 84
Good
38 61
74 80
Pasture, Irrigated
Poor
58 74
83 87
(Legumes and perennial grass)
Fair
44 65
77 82
Good
33 58
72 79
Row Crops
Poor
72 81
88 91
(Field crops - tomatoes, sugar beets, etc.)
Good
67 78
85 89
Small Grain
Poor
65 76
84 88
(Wheat, oats, barley, etc.)
Good
63 75
83 87
Vineyard
See
Note
1 4
1 1
Notes:
1. All runoff index (RI) numbers are for Antecedent Moisture Condition (AMC) II.
2. Quality of cover definitions:
Poor -Heavily grazed or regularly burned areas. Less than 50 per- cent of the ground surface is protected by plant cover or brush and tree canopy.
Fair -Moderate cover with 50 percent to 75 percent of the ground sur- face protected.
Good -Heavy or dense cover with more than 75 percent of the ground surface protected.
3. See Plate C-2 for a detailed description of cover types.
4. Use runoff index numbers based on ground cover type. See discussion under "Cover Type Descriptions" on Plate C-2.
5. Reference Bibliography item 17.
R C F C& W C D
RUNOFF INDEX NUMBERS
TH`/DROL OGY MANUAL
FOR
PERVIOUS AREAS
PLATE E -6.i (2of 2)
11-690
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.7
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.4
.3
.2
0 NOTES:
I. R.I. Number -Infiltration relati onships are derived from rainfall — run off relationships in Bibliography item No. 36.
30 40
50 60
70 80
90 100
11111
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For RI =68� Fp= .20„38 and
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- 40
20 30
40 50
60 70
RUNOFF INDEX NUMBER (RI)
80 90
.0
9 8
7 6
5 .4
.3
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0 100
APPENDIX F
NATIONAL FLOOD HAZARD LAYER FIRMETTE
www.mbakerintl.com
75-410 Gerald Ford Drive., Suite 1001 Palm Desert, CA 92211 Office: 760-346-7481
11-692
National Flood Hazard Layer FIRMette
FEMA
Legend
116°24'37"W 33°47'32"N
Feet
116°24'W 33°47'2"N
0 250 500
1,000
1,500
2,000
1:6,000
Basemap Imagery Source: USGS National Map 2023
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOOD
HAZARD AREAS
Without Base Flood Elevation (BFE)
Zone A, V. A99
With BFE or Depth Zone AE. Ao. AH. VE, AR
Regulatory Floodway
OTHER AREAS OF
FLOOD HAZARD
OTHER AREAS
GENERAL
STRUCTURES
OTHER
FEATURES
MAP PANELS
9 0.2% Annual Chance Flood Hazard, Areas
of 1% annual chance flood with average
depth less than one foot or with drainage
areas of less than one square mile zone x
% Future Conditions 1% Annual
Chance Flood Hazard zonex
Area with Reduced Flood Risk due to
Levee. See Notes. zone x
Area with Flood Risk due to Levee zone D
NO SCREEN Area of Minimal Flood Hazard zonex
Effective LOMRs
Area of Undetermined Flood Hazard Zone D
- — - - Channel, Culvert, or Storm Sewer
WW1 Levee, Dike, or Floodwall
D 20.2 Cross Sections with 1% Annual Chance
17S Water Surface Elevation
e — — — Coastal Transect
su Base Flood Elevation Line (BFE)
Limit of Study
Jurisdiction Boundary
Coastal Transect Baseline
— Profile Baseline
Hydrographic Feature
Digital Data Available
No Digital Data Available
Unmapped
The pin displayed on the map is an approximate
point selected by the user and does not represent
an authoritative property location.
This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.
The basemap shown complies with FEMA's basemap
accuracy standards
The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 9/29/2023 at 12:46 PM and does not
reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or
become superseded by new data over time.
This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for
regulatory purposes.
APPENDIX G
ADS STORMTECH UNDERGROUND STORAGE CHAMBERS PLANS
www.mbakerintl.com
75-410 Gerald Ford Drive., Suite 1001 Palm Desert, CA 92211 Office: 760-346-7481
11-694
1//kb/dOS
User Inputs
Chamber Model:
Outlet Control Structure:
Project Name:
Engineer:
Project Location:
Measurement Type:
Required Storage Volume:
Stone Porosity:
Stone Foundation Depth:
Stone Above Chambers:
Average Cover Over Chambers:
Design Constraint Dimensions:
EMBEDMENT STONE SHALL BE A C LEAN, CRUSHED ANDANGULAR
STONEWITHAN AASHFO M43 DESIGNATION BETWEEN 83 ANON
CHAMBERS SHALL MEET AMA F2418 "STANDARD
SPECIFICATION FOR POLYPROPLBNE(PP)CORRUGATED
WALL STORMiA/ATER COLLECTION CHAMBERS".
ADS GEOSYNTHETICS 6017 NONWOVEN
GEOTBITILE ALL AROUND CLEAN, CRUSHED,
ANGULAR Bu1BECMENT STONE
PERIMETER STONE
IXCAVATION WALL
(CAN BE SLOPED
OR VERTICAL)
6" (150 mm)MIN
MC -3500
END CAP
MC -3500
No
Skilled Nursing Facil-
ity
N/A
California
Imperial
3500 cubic ft.
40%
9 in.
12 in.
18 in.
(21.75 ft. x 80 ft.)
SITE DESIGN ENGINEER IS RESPONSIBLE FOR ENSURING
THE REQUIRED BEARING CAPACITY OF SOILS
Results
System Volume and Bed Size
Installed Storage Volume:
Storage Volume Per Chamber:
Number Of Chambers Required:
Number Of End Caps Required:
Chamber Rows:
Maximum Length:
Maximum Width:
Approx. Bed Size Required:
3725.06 cubic ft.
109.90 cubic ft.
18 4
2 74.18 ft.
15.33 ft.
1137.45 square ft.
System Components
Amount Of Stone Required: 157 cubic yards
Volume Of Excavation (Not Including 232 cubic yards
Fill):
Total Non -woven Geotextile Required:435 square yards
Woven Geotextile Required (excluding17 square yards
Isolator Row):
Woven Geotextile Required (Isolator
Row):
Total Woven Geotextile Required:
Impervious Liner Required:
(150 mm) MI N
80 square yards
97 square yards
0 square yards
GRANULAR WELL -GRADED SOIVAGGREGPTEMDTTURES, <35'A
FINES, COMPACT IN 1Y' (300 mm) MAX LIFTS TO 95% PROCTOR DENSITY. SEE THETABLE OF ACCEPTABLE FILLMATERIALS.
CHAMBERS SHALL BE DEIGNED IN ACCORDMICEIMTH ASTM F2787
"STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THEFAAOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
PAVE/ENT LAYER (DESIGNED
BY SITE DESIGN ENGINEER)
12"(300 mm) MIN
(1140 mm)
non -n -1r IT -u
77"(1950 mm) 12"(300 mm)TYP
Ru11N MUM COVER TO BOTTOM OF FLBI IBLE PAVTAENT. FOR UNPAVED INSTALLATIONS WHERE RUTTING FROM VEHIC LES MAY OCCUR, INCREASE COVER TO 24' 18" 8,
(450 mm) MIN' MCI'
-1 DEPTH OF STONE TO BE DETERMINED BYSITE
DESIGN ENGINEER 9" (230 rrm)MIN
11-695
PROJECT INFORMATION
ENGINEERED PRODUCT
MANAGER
ADS SALES REP
PROJECT NO.
Advanced Drainage Systems, Inc.
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
MC -3500 STORMTECH CHAMBER SPECIFICATIONS
1. CHAMBERS SHALL BE STORMTECH MC -3500.
2. CHAMBERS SHALL BE ARCH -SHAPED AND SHALL BE MANUFACTURED FROM VIRGIN, IMPACT -MODIFIED POLYPROPYLENE COPOLYMERS.
3. CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS" CHAMBER CLASSIFICATION 45x76 DESIGNATION SS.
4. CHAMBER ROWS SHALL PROVIDE CONTINUOUS, UNOBSTRUCTED INTERNAL SPACE WITH NO INTERNAL SUPPORTS THAT WOULD IMPEDE FLOW OR LIMIT ACCESS FOR INSPECTION.
5. THE STRUCTURAL DESIGN OF THE CHAMBERS, THE STRUCTURAL BACKFILL, AND THE INSTALLATION REQUIREMENTS SHALL ENSURE THAT THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS, SECTION 12.12, ARE MET FOR: 1) LONG -DURATION DEAD LOADS AND 2) SHORT -DURATION LIVE LOADS, BASED ON THE AASHTO DESIGN TRUCK WITH CONSIDERATION FOR IMPACT AND MULTIPLE VEHICLE PRESENCES.
6. CHAMBERS SHALL BE DESIGNED, TESTED AND ALLOWABLE LOAD CONFIGURATIONS DETERMINED IN ACCORDANCE WITH ASTM F2787, "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
LOAD CONFIGURATIONS SHALL INCLUDE: 1) INSTANTANEOUS (<1 MIN) AASHTO DESIGN TRUCK LIVE LOAD ON MINIMUM COVER 2) MAXIMUM PERMANENT (75-YR) COVER LOAD AND 3) ALLOWABLE COVER WITH PARKED (1 -WEEK) AASHTO DESIGN TRUCK.
7. REQUIREMENTS FOR HANDLING AND INSTALLATION:
• TO MAINTAIN THE WIDTH OF CHAMBERS DURING SHIPPING AND HANDLING, CHAMBERS SHALL HAVE INTEGRAL, INTERLOCKING STACKING LUGS.
• TO ENSURE A SECURE JOINT DURING INSTALLATION AND BACKFILL, THE HEIGHT OF THE CHAMBER JOINT SHALL NOT BE LESS THAN
• TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT SHALL BE GREATER THAN OR EQUAL TO 450 LBS/FT/%. THE ASC IS DEFINED IN SECTION 6.2.8 OF ASTM F2418. AND b) TO RESIST CHAMBER DEFORMATION DURING INSTALLATION AT ELEVATED TEMPERATURES (ABOVE 73° F / 23° C), CHAMBERS SHALL BE PRODUCED FROM REFLECTIVE GOLD OR YELLOW COLORS.
8. ONLY CHAMBERS THAT ARE APPROVED BY THE SITE DESIGN ENGINEER WILL BE ALLOWED. UPON REQUEST BY THE SITE DESIGN
ENGINEER OR OWNER, THE CHAMBER MANUFACTURER SHALL SUBMIT A STRUCTURAL EVALUATION FOR APPROVAL BEFORE DELIVERING CHAMBERS TO THE PROJECT SITE AS FOLLOWS:
• THE STRUCTURAL EVALUATION SHALL BE SEALED BY A REGISTERED PROFESSIONAL ENGINEER. • THE STRUCTURAL EVALUATION SHALL DEMONSTRATE THAT THE SAFETY FACTORS ARE GREATER THAN OR EQUAL TO 1.95 FOR DEAD LOAD AND 1.75 FOR LIVE LOAD, THE MINIMUM REQUIRED BY ASTM F2787 AND BY SECTIONS 3 AND 12.12 OF THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS FOR THERMOPLASTIC PIPE. • THE TEST DERIVED CREEP MODULUS AS SPECIFIED IN ASTM F2418 SHALL BE USED FOR PERMANENT DEAD LOAD DESIGN EXCEPT THAT IT SHALL BE THE 75 -YEAR MODULUS USED FOR DESIGN.
9. CHAMBERS AND END CAPS SHALL BE PRODUCED AT AN ISO 9001 CERTIFIED MANUFACTURING FACILITY.
C)
CO
C)
///IDS
SiteAssist
FOR STORMTECH
INSTALLATION INSTRUCTIONS
VISIT OUR APP
IMPORTANT - NOTES FOR THE BIDDING AND INSTALLATION OF MC -3500 CHAMBER SYSTEM
1. STORMTECH MC -3500 CHAMBERS SHALL NOT BE INSTALLED UNTIL THE MANUFACTURER'S REPRESENTATIVE HAS COMPLETED A PRE -CONSTRUCTION MEETING WITH THE INSTALLERS.
2. STORMTECH MC -3500 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".
3. CHAMBERS ARE NOT TO BE BACKFILLED WITH A DOZER OR AN EXCAVATOR SITUATED OVER THE CHAMBERS.
STORMTECH RECOMMENDS 3 BACKFILL METHODS:
• STONESHOOTER LOCATED OFF THE CHAMBER BED.
• BACKFILL AS ROWS ARE BUILT USING AN EXCAVATOR ON THE FOUNDATION STONE OR SUBGRADE. • BACKFILL FROM OUTSIDE THE EXCAVATION USING A LONG BOOM HOE OR EXCAVATOR.
4. THE FOUNDATION STONE SHALL BE LEVELED AND COMPACTED PRIOR TO PLACING CHAMBERS.
5. JOINTS BETWEEN CHAMBERS SHALL BE PROPERLY SEATED PRIOR TO PLACING STONE.
6. MAINTAIN MINIMUM - 6" (150 mm) SPACING BETWEEN THE CHAMBER ROWS.
7. INLET AND OUTLET MANIFOLDS MUST BE INSERTED A MINIMUM OF 12" (300 mm) INTO CHAMBER END CAPS.
8. EMBEDMENT STONE SURROUNDING CHAMBERS MUST BE A CLEAN, CRUSHED, ANGULAR STONE MEETING THE AASHTO M43 DESIGNATION OF #3 OR #4.
9. STONE MUST BE PLACED ON THE TOP CENTER OF THE CHAMBER TO ANCHOR THE CHAMBERS IN PLACE AND PRESERVE ROW SPACING.
10. THE CONTRACTOR MUST REPORT ANY DISCREPANCIES WITH CHAMBER FOUNDATION MATERIALS BEARING CAPACITIES TO THE SITE DESIGN ENGINEER.
11. ADS RECOMMENDS THE USE OF "FLEXSTORM CATCH IT" INSERTS DURING CONSTRUCTION FOR ALL INLETS TO PROTECT THE SUBSURFACE STORMWATER MANAGEMENT SYSTEM FROM CONSTRUCTION SITE RUNOFF.
NOTES FOR CONSTRUCTION EQUIPMENT
1. STORMTECH MC -3500 CHAMBERS SHALL BE INSTALLED IN ACCORDANCE WITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".
2. THE USE OF EQUIPMENT OVER MC -3500 CHAMBERS IS LIMITED:
• NO EQUIPMENT IS ALLOWED ON BARE CHAMBERS.
• NO RUBBER TIRED LOADER, DUMP TRUCK, OR EXCAVATORS ARE ALLOWED UNTIL PROPER FILL DEPTHS ARE REACHED IN ACCORDANCE WITH THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".
WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT CAN BE FOUND IN THE "STORMTECH MC-3500/MC-4500 CONSTRUCTION GUIDE".
3. FULL 36" (900 mm) OF STABILIZED COVER MATERIALS OVER THE CHAMBERS IS REQUIRED FOR DUMP TRUCK TRAVEL OR DUMPING.
USE OF A DOZER TO PUSH EMBEDMENT STONE BETWEEN THE ROWS OF CHAMBERS MAY CAUSE DAMAGE TO CHAMBERS AND IS NOT AN ACCEPTABLE BACKFILL METHOD. ANY CHAMBERS DAMAGED BY USING THE "DUMP AND PUSH" METHOD ARE NOT COVERED UNDER THE STORMTECH STANDARD WARRANTY.
CONTACT STORMTECH AT 1-888-892-2694 WITH ANY QUESTIONS ON INSTALLATION REQUIREMENTS OR WEIGHT LIMITS FOR CONSTRUCTION EQUIPMENT. ©2023 ADS, INC.
PROPOSED LAYOUT
CONCEPTUAL ELEVATIONS:
*INVERT ABOVE BASE OF CHAMBER
18 4
12 9
STORMTECH MC -3500 CHAMBERS
STORMTECH MC -3500 END CAPS
STONE ABOVE (in)
STONE BELOW (in)
STONE VOID
INSTALLED SYSTEM VOLUME (CF)
(PERIMETER STONE INCLUDED)
(COVER STONE INCLUDED)
(BASE STONE INCLUDED)
SYSTEM AREA (SF)
SYSTEM PERIMETER (ft)
MAXIMUM ALLOWABLE GRADE (TOP OF PAVEMENT/UNPAVED):
MINIMUM ALLOWABLE GRADE (UNPAVED WITH TRAFFIC):
MINIMUM ALLOWABLE GRADE (UNPAVED NO TRAFFIC):
MINIMUM ALLOWABLE GRADE (TOP OF RIGID CONCRETE PAVEMENT):
MINIMUM ALLOWABLE GRADE (BASE OF FLEXIBLE PAVEMENT):
TOP OF STONE:
TOP OF MC -3500 CHAMBER:
12" x 12" TOP MANIFOLD INVERT:
24" ISOLATOR ROW PLUS INVERT:
BOTTOM OF MC -3500 CHAMBER:
BOTTOM OF STONE:
12.50 6.50
6.00 6.00
6.00 5.50
4 50
2.95 0.92
0.75 0.00
PART TYPE
PREFABRICATED END CAP
ITEM ON
LAYOUT
A
DESCRIPTION INVERT* MAX FLOW
24" BOTTOM CORED END CAP, PART#: MC3500IEPP24BC / TYP OF ALL 24" BOTTOM
CONNECTIONS AND ISOLATOR PLUS ROWS
12" TOP CORED END CAP, PART#: MC3500IEPP12T / TYP OF ALL 12" TOP CONNECTIONS 26.36" INSTALL FLAMP ON 24" ACCESS PIPE / PART#: MCFLAMP
12" x 12" TOP MANIFOLD, ADS N-12 26.36"
2.06"
40 PREFABRICATED END CAP
FLAMP
MANIFOLD
NYLOPLAST (INLET W/ ISO
PLUS ROW)
B
C
D
3726
E
30" DIAMETER (24.00" SUMP MIN)
2.5 CFS IN
1137
179.0
ISOLATOR ROW PLUS
(SEE DETAIL)
PLACE MINIMUM 17.50' OF ADSPLUS175 WOVEN GEOTEXTILE OVER BEDDING
STONE AND UNDERNEATH CHAMBER FEET FOR SCOUR PROTECTION AT ALL
CHAMBER INLET ROWS
— BED LIMITS
NOTES
• MANIFOLD SIZE TO BE DETERMINED BY SITE DESIGN ENGINEER. SEE TECH NOTE #6.32 FOR MANIFOLD SIZING GUIDANCE. • DUE TO THE ADAPTATION OF THIS CHAMBER SYSTEM TO SPECIFIC SITE AND DESIGN CONSTRAINTS, IT MAY BE NECESSARY TO CUT AND COUPLE ADDITIONAL PIPE TO STANDARD MANIFOLD COMPONENTS IN THE FIELD.
• THE SITE DESIGN ENGINEER MUST REVIEW ELEVATIONS AND IF NECESSARY ADJUST GRADING TO ENSURE THE CHAMBER COVER REQUIREMENTS ARE MET. • THIS CHAMBER SYSTEM WAS DESIGNED WITHOUT SITE -SPECIFIC INFORMATION ON SOIL CONDITIONS OR BEARING CAPACITY. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR
DETERMINING
THE SUITABILITY OF THE SOIL AND PROVIDING THE BEARING CAPACITY OF THE INSITU SOILS. THE BASE STONE DEPTH MAY BE INCREASED OR DECREASED ONCE THIS INFORMATION IS PROVIDED.
• NOT FOR CONSTRUCTION: THIS LAYOUT IS FOR DIMENSIONAL PURPOSES ONLY TO PROVE CONCEPT & THE REQUIRED STORAGE VOLUME CAN BE ACHIEVED ON SITE.
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
DRAWN: DP
CHECKED: N/A
PROJECT #:
DESCRIPTION
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Chamber System
888-892-2694 I WWW.STORMTECH.COM
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ACCEPTABLE FILL MATERIALS: STORMTECH MC -3500 CHAMBER SYSTEMS
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
DRAWN: DP
CHECKED: N/A
THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.
MATERIAL LOCATION
DESCRIPTION
AASHTO MATERIAL
CLASSIFICATIONS
COMPACTION / DENSITY REQUIREMENT
D
FINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THE TOP OF THE 'C'
LAYER TO THE BOTTOM OF FLEXIBLE PAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THAT PAVEMENT SUBBASE MAY BE PART OF THE 'D' LAYER
ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS.
CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS.
N/A
PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED
INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND
PREPARATION REQUIREMENTS.
Li
0 PROJECT #:
C
INITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THE TOP OF THE EMBEDMENT STONE ('B' LAYER) TO 24" (600 mm) ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENT SUBBASE MAY BE A PART OF THE 'C' LAYER.
GRANULAR WELL -GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR PROCESSED AGGREGATE.
MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS LAYER.
AASHTO M145'
A-1, A-2-4, A-3
OR
AASHTO M431
3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 BEGIN COMPACTIONS AFTER 24" (600 mm) OF MATERIAL OVER
THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN
12" (300 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR
PROCESSED AGGREGATE MATERIALS.
B
EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS FROM THE FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYER ABOVE.
CLEAN, CRUSHED, ANGULAR STONE
AASHTO M431
3, 4
NO COMPACTION REQUIRED.
DESCRIPTION l
A
FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE SUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER.
CLEAN, CRUSHED, ANGULAR STONE
AASHTO M431
3, 4
PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE.2'3
PLEASE NOTE:
1. THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE".
2. STORMTECH COMPACTION REQUIREMENTS ARE MET FOR 'A' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 9" (230 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR.
3. WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FOR COMPACTION REQUIREMENTS.
4. ONCE LAYER 'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER 'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION.
ADS GEOSYNTHETICS 601T NON -WOVEN GEOTEXTILE ALL PAVEMENT LAYER (DESIGNED
AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS BY SITE DESIGN ENGINEER) I
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(SEE NOTE 4)
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BY SITE DESIGN ENGINEER 9" (230 mm) MIN
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HILLIARD, OH 43026
1-800-733-7473
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12" (300 mm) MIN
END CAP SUBGRADE SOILS (150 mm) MIN
(SEE NOTE 3)
NOTES:
1. CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS" CHAMBER CLASSIFICATION 45x76 DESIGNATION SS.
2. MC -3500 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
3. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH CONSIDERATION FOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS.
4. PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS.
5. REQUIREMENTS FOR HANDLING AND INSTALLATION:
• TO MAINTAIN THE WIDTH OF CHAMBERS DURING SHIPPING AND HANDLING, CHAMBERS SHALL HAVE INTEGRAL, INTERLOCKING STACKING LUGS.
D • TO ENSURE A SECURE JOINT DURING INSTALLATION AND BACKFILL, THE HEIGHT OF THE CHAMBER JOINT SHALL NOT BE LESS THAN 3". ) • TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT SHALL BE GREATER THAN OR EQUAL TO 450 LBS/FT/%. THE ASC IS DEFINED IN SECTION 6.2.8 OF ASTM F2418. AND b) TO RESIST CHAMBER DEFORMATION DURING INSTALLATION AT ELEVATED TEMPERATURES (ABOVE 73° F / 23° C), CHAMBERS SHALL BE PRODUCED FROM REFLECTIVE GOLD OR YELLOW COLORS.
SHEET
3 OF 6
COVER PIPE CONNECTION TO END
CAP WITH ADS GEOSYNTHETICS 601T
NON -WOVEN GEOTEXTILE
STORMTECH HIGHLY RECOMMENDS
FLEXSTORM INSERTS IN ANY UPSTREAM
STRUCTURES WITH OPEN GRATES
ELEVATED BYPASS MANIFOLD
SUMP DEPTH TBD BY
SITE DESIGN ENGINEER
(24" [600 mm] MIN RECOMMENDED)
INSPECTION & MAINTENANCE
STEP 1)
STEP 2)
NYLOPLAST
INSTALL FLAMP ON 24" (600 mm) ACCESS PIPE r OPTIONAL INSPECTION PORT PART #: MCFLAMP
MC -3500 CHAMBER
24" (600 mm) HDPE ACCESS PIPE REQUIRED
USE FACTORY PARTIAL CUT END CAP PART #:
MC3500IEPP24BC OR MC3500IEPP24BW
MC -3500 ISOLATOR ROW PLUS DETAIL
NTS
INSPECT ISOLATOR ROW PLUS FOR SEDIMENT
A. INSPECTION PORTS (IF PRESENT)
A.1. REMOVE/OPEN LID ON NYLOPLAST INLINE DRAIN
A.2. REMOVE AND CLEAN FLEXSTORM FILTER IF INSTALLED
A.3. USING A FLASHLIGHT AND STADIA ROD, MEASURE DEPTH OF SEDIMENT AND RECORD ON MAINTENANCE LOG A.4. LOWER A CAMERA INTO ISOLATOR ROW PLUS FOR VISUAL INSPECTION OF SEDIMENT LEVELS (OPTIONAL) A.5. IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.
B. ALL ISOLATOR PLUS ROWS
B.1. REMOVE COVER FROM STRUCTURE AT UPSTREAM END OF ISOLATOR ROW PLUS B.2. USING A FLASHLIGHT, INSPECT DOWN THE ISOLATOR ROW PLUS THROUGH OUTLET PIPE i) MIRRORS ON POLES OR CAMERAS MAY BE USED TO AVOID A CONFINED SPACE ENTRY ii) FOLLOW OSHA REGULATIONS FOR CONFINED SPACE ENTRY IF ENTERING MANHOLE B.3. IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.
CLEAN OUT ISOLATOR ROW PLUS USING THE JETVAC PROCESS
A. A FIXED CULVERT CLEANING NOZZLE WITH REAR FACING SPREAD OF 45" (1.1 m) OR MORE IS PREFERRED B. APPLY MULTIPLE PASSES OF JETVAC UNTIL BACKFLUSH WATER IS CLEAN C. VACUUM STRUCTURE SUMP AS REQUIRED
STEP 3) REPLACE ALL COVERS, GRATES, FILTERS, AND LIDS; RECORD OBSERVATIONS AND ACTIONS.
STEP 4) INSPECT AND CLEAN BASINS AND MANHOLES UPSTREAM OF THE STORMTECH SYSTEM.
NOTES
1. INSPECT EVERY 6 MONTHS DURING THE FIRST YEAR OF OPERATION. ADJUST THE INSPECTION INTERVAL BASED ON PREVIOUS OBSERVATIONS OF SEDIMENT ACCUMULATION AND HIGH WATER ELEVATIONS.
2. CONDUCT JETTING AND VACTORING ANNUALLY OR WHEN INSPECTION SHOWS THAT MAINTENANCE IS NECESSARY.
MC -3500 END CAP
ONE LAYER OF ADSPLUS175 WOVEN GEOTEXTILE BETWEEN
FOUNDATION STONE AND CHAMBERS
8.25' (2.51 m) MIN WIDE CONTINUOUS FABRIC WITHOUT SEAMS
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
DRAWN: DP
CHECKED: N/A
PROJECT #:
DESCRIPTION
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12" (300 mm) MIN INSERTION —
MANIFOLD STUB
MANIFOLD HEADER
12" (300 mm)
MIN SEPARATION
MC -SERIES END CAP INSERTION DETAIL
NTS
STORMTECH END CAP
12" (300 mm)
MIN INSERTION
NOTE: MANIFOLD STUB MUST BE LAID HORIZONTAL
FOR A PROPER FIT IN END CAP OPENING.
12" (300 mm)
MIN SEPARATION
MANIFOLD HEADER
MANIFOLD STUB
VALLEY
STIFFENING RIB
MC -3500 TECHNICAL SPECIFICATION
NTS
CREST
CREST WEB
STIFFENING RIB
UPPER JOINT CORRUGATION
BUILD ROW IN THIS DIRECTION 01>
77.0"
(1956 mm)
NOMINAL CHAMBER SPECIFICATIONS
SIZE (W X H X INSTALLED LENGTH)
CHAMBER STORAGE
MINIMUM INSTALLED STORAGE*
WEIGHT
LOWER JOINT
CORRUGATION
FOOT
77.0" X 45.0" X 86.0"
109.9 CUBIC FEET
175.0 CUBIC FEET
134 lbs.
(1956 mm X 1143 mm X 2184 mm)
(3.11 m3)
(4.96 m3)
(60.8 kg)
NOMINAL END CAP SPECIFICATIONS
SIZE (W X H X INSTALLED LENGTH) 75.0" X 45.0" X 22.2" (1905 mm X 1143 mm X 564 mm) END CAP STORAGE 14.9 CUBIC FEET (0.42 m3)
MINIMUM INSTALLED STORAGE* 45.1 CUBIC FEET (1.28 m3)
WEIGHT 49 lbs. (22.2 kg)
*ASSUMES 12" (305 mm) STONE ABOVE, 9" (229 mm) STONE FOUNDATION, 6" SPACING BETWEEN CHAMBERS, 6" (152 mm) STONE PERIMETER IN FRONT OF END CAPS AND 40% STONE POROSITY STUBS AT BOTTOM OF END CAP FOR PART NUMBERS ENDING WITH "B" STUBS AT TOP OF END CAP FOR PART NUMBERS ENDING WITH "T" END CAPS WITH A WELDED CROWN PLATE END W TH "C"
END CAPS WITH A PREFABRICATED WELDED STUB END WITH "W"
PART #
STUB
B
C
6T
MC35001EPP06T
6" (150 mm)
33.21" (844 mm)
---
MC3500IEPPO6B
0.66" (17 mm)
MC3500IEPPO8T
8" (200 mm)
31.16" (791 mm)
---
MC3500IEPPO8B
---
0.81" (21 mm)
MC35001EPP10T
10" (250 mm)
29.04" (738 mm)
---
MC3500IEPP10B
---
0.93" (24 mm)
MC3500IEPP12T
12" (300 mm)
26.36" (670 mm)
---
MC35001EPP12B
---
1.35" (34 mm)
MC3500IEPP15T
15" (375 mm)
23.39" (594 mm)
---
MC3500IEPP15B
---
1.50" (38 mm)
MC35001EPP18TC
18" (450 mm)
20.03" (509 mm)
---
MC3500IEPP18TW
MC3500IEPP18BC
1.77" (45 mm)
MC3500IEPP18BW
MC3500IEPP24TC
24" (600 mm)
14.48" (368 mm)
MC3500IEPP24TW
MC3500IEPP24BC
2.06" (52 mm)
MC35001EPP24BW
MC3500IEPP3OBC
30" (750 mm)
---
2.75" (70 mm)
NOTE: ALL DIMENSIONS ARE NOMINAL
86.0" (2184 mm)
INSTALLED
90.0" (2286 mm)
ACTUAL LENGTH
22.2"
(564 mm)
INSTALLED
B
25.7"
'1 (653 mm) I�
CUSTOM PRECORED INVERTS ARE
AVAILABLE UPON REQUEST.
INVENTORIED MANIFOLDS INCLUDE
12-24" (300-600 mm) SIZE ON SIZE
AND 15-48" (375-1200 mm)
ECCENTRIC MANIFOLDS. CUSTOM
INVERT LOCATIONS ON THE MC -3500
END CAP CUT IN THE FIELD ARE NOT
RECOMMENDED FOR PIPE SIZES
GREATER THAN 10" (250 mm). THE
INVERT LOCATION IN COLUMN 'B'
ARE THE HIGHEST POSSIBLE FOR
THE PIPE SIZE.
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
DRAWN: DP
CHECKED: N/A
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DESCRIPTION
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NYLOPLAST DRAIN BASIN
NTS
INTEGRATED DUCTILE IRON
FRAME & GRATE/SOLID TO
MATCH BASIN O.D.
12" (610 mm) MIN
(FOR AASHTO H-20)
INVERT ACCORDING TO
PLANS/TAKE OFF
VARIOUS TYPES OF INLET AND
OUTLET ADAPTERS AVAILABLE:
4-30" (100-750 mm) FOR
CORRUGATED HDPE
WATERTIGHT JOINT
(CORRUGATED HDPE SHOWN)
NOTES
1. 18" (457 mm)
MIN WIDTH
AASHTO H-20 CONCRETE SLAB
8" (203 mm) MIN THICKNESS
TRAFFIC LOADS: CONCRETE DIMENSIONS
ARE FOR GUIDELINE PUPOSES ONLY.
ACTUAL CONCRETE SLAB MUST BE
DESIGNED GIVING CONSIDERATION FOR
LOCAL SOIL CONDITIONS, TRAFFIC LOADING
& OTHER APPLICABLE DESIGN FACTORS
ADAPTER ANGLES VARIABLE 0°- 360°
ACCORDING TO PLANS
VARIABLE SUMP DEPTH
ACCORDING TO PLANS
[6" (152 mm) MIN ON 8-24" (200-600 mm),
10" (254 mm) MIN ON 30" (750 mm)]
4" (102 mm) MIN ON 8-24" (200-600 mm)
6" (152 mm) MIN ON 30" (750 mm)
BACKFILL MATERIAL BELOW AND TO SIDES
OF STRUCTURE SHALL BE ASTM D2321
CLASS I OR II CRUSHED STONE OR GRAVEL
AND BE PLACED UNIFORMLY IN 12" (305 mm)
LIFTS AND COMPACTED TO MIN OF 90%
8-30" (200-750 mm) GRATES/SOLID COVERS SHALL BE DUCTILE IRON PER ASTM A536 GRADE 70-50-05
2. 12-30" (300-750 mm) FRAMES SHALL BE DUCTILE IRON PER ASTM A536 GRADE 70-50-05
3. DRAIN BASIN TO BE CUSTOM MANUFACTURED ACCORDING TO PLAN DETAILS
4. DRAINAGE CONNECTION STUB JOINT TIGHTNESS SHALL CONFORM TO ASTM D3212 FOR CORRUGATED HDPE (ADS & HANCOR DUAL WALL) & SDR 35 PVC
5. FOR COMPLETE DESIGN AND PRODUCT INFORMATION: WWW.NYLOPLAST-US.COM
6. TO ORDER CALL: 800-821-6710
A
PART #
GRATE/SOLID COVER OPTIONS
8 (200 mm)
2808AG
PEDESTRIAN LIGHT
DUTY
STANDARD LIGHT
DUTY
SOLID LIGHT DUTY
10"
(250 mm)
2810AG
PEDESTRIAN LIGHT
DUTY
STANDARD LIGHT
DUTY
SOLID LIGHT DUTY
12"
PEDESTRIAN
STANDARD AASHTO
SOLID
(300 mm)
2812AG
AASHTO H-10
H-20
AASHTO H-20
15"
PEDESTRIAN
STANDARD AASHTO
SOLID
(375 mm)
2815AG
AASHTO H-10
H-20
AASHTO H-20
18"
PEDESTRIAN
STANDARD AASHTO
SOLID
(450 mm)
2818AG
AASHTO H-10
H-20
AASHTO H-20
24"
PEDESTRIAN
STANDARD AASHTO
SOLID
(600 mm)
2824AG
AASHTO H-10
H-20
AASHTO H-20
30"
PEDESTRIAN
STANDARD AASHTO
SOLID
(750 mm)
2830AG
AASHTO H-20
H-20
AASHTO H-20
SKILLED NURSING FACILITY
RANCHO MIRAGE, CA, USA
DRAWN: DP
CHECKED: N/A
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DESCRIPTION
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11-702
2014 Whitewater River Region WQMP
Project Specific
Preliminary Water Quality Management Plan
For: Skilled Nursing Facility
NEC Gerald Ford Drive and Bob Hope Drive, Range Mirage, CA 92270 DEVELOPMENT NO. APN 685-120-003, 685-120-004
DESIGN REVIEW NO.
Prepared for:
Advanced Health Care
310 W. Park Lane
Farmington, UT 84025
Telephone: TBD
Prepared by:
Todd Pitner, P.E.
Danielle Peltier, E.I.T.
Michael Baker International
75-410 Gerald Ford Drive Suite 100
Palm Desert, CA 92211
Telephone: (760) 346-7481
Original Date Prepared: October 2023
Revision Date(s):
11-703
2014 Whitewater River Region WQMP
Skilled Nursing Facility
OWNER'S CERTIFICATION
This project -specific Water Quality Management Plan (WQMP) has been prepared for:
Advanced Health Care
by Michael Baker International
for the project known as Skilled Nursing Facility at NEC Gerald Ford Drive and Bob Hope Drive, Range Mirage, CA 92270.
This WQMP is intended to comply with the requirements of the City of Rancho Mirage for APN 685- 120-003, 685-120-004, which includes the requirement for the preparation and implementation of a project -specific WQMP.
The undersigned, while owning the property/project described in the preceding paragraph, shall be responsible for the implementation of this WQMP and will ensure that this WQMP is amended as appropriate to reflect up-to-date conditions on the site. This WQMP will be reviewed with the facility operator, facility supervisors, employees, tenants, maintenance and service contractors, or any other party (or parties) having responsibility for implementing portions of this WQMP. At least one copy of this WQMP will be maintained at the project site or project office in perpetuity.
The undersigned is authorized to certify and to approve implementation of this WQMP. The undersigned is aware that implementation of this WQMP is enforceable under the City of Rancho Mirage Water Quality Ordinance (Municipal Code Section 15.64.140).
If the undersigned transfers its interest in the subject property/project, the undersigned shall notify the successor in interest of its responsibility to implement this WQMP. "I, the undersigned, certify under penalty of law that I am the owner of the property that is the subject of this WQMP, and that the provisions of this WQMP have been reviewed and accepted and that the WQMP will be transferred to future successors in interest."
ATTEST
Owner's Signature
Owner's Printed Name
Notary Signature
Owner's Title/Position
Printed Name
Date
Title/Position
310 W. Park Lane
Farmington, UT 84025
Telephone TBD
Date
THIS FORM SHALL BE NOTARIZED BEFORE ACCEPTANCE OF THE
FINAL PROJECT SPECIFIC WQMP
11-704
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Contents
SECTION PAGE
I. Project Description 1
II. Site Characterization 5
III. Pollutants of Concern 7
IV. Hydrologic Conditions of Concern 8
V. Best Management Practices 9
V.1 SITE DESIGN BMP CONCEPTS, LID/SITE DESIGN AND TREATMENT CONTROL BMPs 9 V.1.A SITE DESIGN BMP CONCEPTS AND LID/SITE DESIGN BMPs 11 V.1.B TREATMENT CONTROL BMPs 17
V.1.0 MEASURABLE GOAL SUMMARY 19
V.2 SOURCE CONTROL BMPs 20
V.3 EQUIVALENT TREATMENT CONTROL BMP ALTERNATIVES 24
V.4 REGIONALLY -BASED BMPs 24
VI. Operation and Maintenance Responsibility for BMPs 25 VII. Funding 28
TABLES
TABLE 1. POLLUTANT OF CONCERN SUMMARY 7
TABLE 2. BMP SELECTION MATRIX BASED UPON POLLUTANT OF CONCERN REMOVAL EFFICIENCY 10 TABLE 3. IMPLEMENTATION OF SITE DESIGN BMP CONCEPTS 12
TABLE 4. LID/SITE DESIGN BMPs MEETING THE LID/SITE DESIGN MEASURABLE GOAL 16 TABLE 5: TREATMENT CONTROL BMP SUMMARY 18
TABLE 6: MEASURABLE GOAL SUMMARY 19
TABLE 7. SOURCE CONTROL BMPs 20
APPENDICES
A. CONDITIONS OF APPROVAL
B. VICINITY MAP, WQMP SITE PLAN, AND RECEIVING WATERS MAP C. SUPPORTING DETAIL RELATED TO HYDROLOGIC CONDITIONS OF CONCERN (IF APPLICABLE) D. EDUCATIONAL MATERIALS
E. SOILS REPORT (IF APPLICABLE)
F. STRUCTURAL BMP AND/OR RETENTION FACILITY SIZING CALCULATIONS AND DESIGN DETAILS G. AGREEMENTS — CC&Rs, COVENANT AND AGREEMENTS, BMP MAINTENANCE AGREEMENTS AND/OR
OTHER MECHANISMS FOR ENSURING ONGOING OPERATION, MAINTENANCE, FUNDING AND
TRANSFER OF REQUIREMENTS FOR THIS PROJECT -SPECIFIC WQMP H. PHASE 1 ENVIRONMENTAL SITE ASSESSMENT — SUMMARY OF SITE REMEDIATION CONDUCTED AND
USE RESTRICTIONS
I. PROJECT -SPECIFIC WQMP SUMMARY DATA FORM
October 2023 1-i
11-705
2014 Whitewater River Region WQMP
Skilled Nursing Facility
I. Project Description
Project Owner:
WQMP Preparer:
Advanced Health Care
310 W. Park Lane
Farmington, UT 84025
Telephone: TBD
Todd Pitner, P.E.
Danielle Peltier, E.I.T.
75-410 Gerald Ford Drive Suite 100
Palm Desert, CA 92211
Telephone: (760) 346-7481
Project Site Address: NEC Gerald Ford Drive and Bob Hope Drive Rancho Mirage, CA 92270
Planning Area/
Community Name/
Development Name:
City of Rancho Mirage/
Skilled Nursing Facility
APN Number(s): 685-120-003, 685-120-004
Latitude & Longitude: 33.788075°, -116.405137°
Receiving Water: Whitewater River, Coachella Valley Stormwater Channel Project Site Size: 5.4 acres
Standard Industrial Classification (SIC) Code: 8051
Formation of Home Owners' Association (HOA)
or Property Owners Association (POA): Y n N N
October 2023 1-1
11-706
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Additional Permits/Approvals required for the Project:
AGENCY
Permit required
State Department of Fish and Wildlife, Fish and Game
Code § 1602 Streambed Alteration Agreement
Y NO
State Water Resources Control Board, Clean Water Act
(CWA) Section 401 Water Quality Certification
Y N
US Army Corps of Engineers, CWA Section 404 permit
1' NN
US Fish and Wildlife, Endangered Species Act Section 7
biological opinion
y I I N
Statewide Construction General Permit Coverage
Y ' N
Statewide Industrial General Permit Coverage
1' NN
Other (please list in the space below as required)
City of Rancho Mirage Building Permit Y // N
City of Rancho Mirage Grading Permit Y /1 N
• The commercial project will not divert or obstruct the natural flow or change the bed, channel, or bank of any stream, river, or lake. Therefore, a State Department of Fish and Game, 1601 Streambed Alteration Agreement is not required. • The commercial project will not result in discharge into navigable waters; therefore, a Clean Water Act Section 401 Water Quality Certification permit is not required. • The commercial project will not result in the discharge of dredged or fill materials into the waters of the United States, including wetlands. A Clean Water Act Section 404 Permit is not required for this project.
• The commercial project site is not recognized as a habitat of an endangered species, nor does it form part of a Conservation Area under the Coachella Valley Multiple Species Habitat Conservation Plan. A U.S. Fish and Wildlife, Endangered Species Act Section 7 biological opinion is not required for this project.
• The commercial project is not industrial in nature. Therefore, coverage under the General Permit for Storm Water Discharges Associated with Industrial Activities is not required.
This project will obtain coverage under the State Water Board NPDES General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities.
October 2023 1-2
11-707
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Project Description:
The Skilled Nursing Facility is a proposed commercial development in the City of Rancho Mirage that consists of the new building, concrete flatwork, paved parking areas, landscape areas, and various associated site improvements. The project is approximately 5.4 acres and is located at the northeast corner of Gerald Ford Drive and Bob Hope Drive, Figure 1 shows the general vicinity of the project.
Cathedral
City
DINAH SHORE DR
Rancho Uirag
Thousand
Palms
VICINITY MAP
WARING
111
FAIRWAY -
NO SCALE
Figure 1. Vicinity Map
The project site is vacant with a meandering sidewalk on the south and west perimeters, which is the only existing impervious surface on the property. Runoff generally flows in the southerly direction until meeting Gerald Ford Drive — the proposed site has a similar drainage pattern.
The development proposes 3.73 acres (69.1%) of impervious land cover and 1.67 acres (30.9%) of pervious land cover. Approximately 4.41 acres of the project site drains to the proposed infiltration basins, and the rest consists of self -treating areas. The potential pollutants generated by this commercial and parking lot land use includes bacteria/viruses, heavy metals, toxic organic compounds, sediment/turbidity, trash & debris, and oil & grease. The harmful effects of these pollutants shall be reduced through proposed BMPs for the development.
Activities:
The project doesn't have any specific area where heightened activities would warrant additional site design, source control, or treatment measures.
Materials and Storage Delivery:
The project doesn't include any outdoor material storage areas.
October 2023
1-3
11-708
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Generated Wastes:
The project is expected to generate waste typical of commercial land uses, generally non- hazardous solid waste. Burrtec Waste Industries will collect and manage the project's waste on a typical schedule — pollution prevention, recycling practices, and waste reduction will be implemented on -site.
Appendix A of this project -specific WQMP includes a complete copy of the final Conditions of Approval. Appendix B of this project -specific WQMP includes:
a. A Vicinity Map identifying the project site and surrounding planning areas in sufficient detail; and
b. A Site Plan for the project. The Site Plan included as part of Appendix B depicts the following project features:
• Location and identification of all structural BMPs, including Source Control, LID/Site Design and Treatment Control BMPs.
• Landscaped areas.
• Paved areas and intended uses (i.e., parking, outdoor work area, outdoor material storage area, sidewalks, patios, tennis courts, etc.).
• Number and type of structures and intended uses (i.e., buildings, tenant spaces, dwelling units, community facilities such as pools, recreation facilities, tot lots, etc.).
• Infrastructure (i.e., streets, storm drains, etc.) that will revert to public agency ownership and operation.
• Location of existing and proposed public and private storm drainage facilities (i.e., storm drains, channels, basins, etc.), including catch basins and other inlets/outlet structures. Existing and proposed drainage facilities should be clearly differentiated.
• Location(s) of Receiving Waters to which the project directly or indirectly discharges.
• Location of points where onsite (or tributary offsite) flows exit the property/project site.
• Delineation of proposed drainage area boundaries, including tributary offsite areas, for each location where flows exit the project site and existing site (where existing site flows are required to be addressed). Each tributary area should be clearly denoted.
• Pre- and post -project topography.
Appendix I is a one page form that summarizes pertinent information relative to this project - specific WQMP.
October 2023 1-4
11-709
2014 Whitewater River Region WQMP
Skilled Nursing Facility
II. Site Characterization
Land Use Designation or Zoning: Commercial Office, Special Corner Current Property Use: Vacant
Proposed Property Use:
Commercial Office (Medical)
Availability of Soils Report: Y 11 N ❑ Note: A soils report is required if infiltration BMPs are utilized. Attach report in Appendix E.
Phase 1 Site Assessment:
Y n N ® Note: If prepared, attached remediation
summary and use restrictions in Appendix H.
October 2023 1-5
11-710
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Receiving Waters for Urban Runoff from Site
Receiving
Waters
EPA Approved 303(d) List
Impairments
Designated
Beneficial Uses
Proximity to RARE
Beneficial Use
Designated Receiving
Waters
Whitewater
River
Whitewater River is not a 303(d)
impaired waterbody.
MUN, AGR,
GWR, REC I,
REC II, COLD,
WILD, POW
Coachella
Valley
Stormwater
Channel*
Toxaphene, Toxicity, Dieldrin, PCBs
(Polychlorinated biphenyls),
Indicator Bacteria (Pathogens), DDT
(Dichlorodiphenyltrichloroethane),
Ammonia, Dissolved Oxygen,
Disulfoton
FRSH, REC I**,
REC II**,
WARM, WILD,
RARE***
9.25 miles
*Section of perennial flow from approximately Indio to the Salton Sea. **Unauthorized use.
***Rare, endangered, or threatened wildlife exists in or utilizes some of these waterway(s). If the RARE beneficial use may be affected by a water quality control decision, responsibility for substantiation of the existence of rare, endangered, or threatened species on a case -by -case basis is upon the California Depth liiient of Fish and Wildlife on its own initiative and/or at the request of the Regional Water Board; and such substantiation must be provided within a reasonable time frame as approved by the Regional Water Board.
October 2023
1-6
11-711
2014 Whitewater River Region WQMP
Skilled Nursing Facility
III. Pollutants of Concern
Table 1. Pollutant of Concern Summary
Pollutant Category
Potential for Project
and/or Existing Site
Causing Receiving Water
Impairment
Bacteria/Virus
Y
Y (Indicator
Bacteria/Pathogens)
Heavy Metals
N
N
Nutrients
N
Y
Toxic Organic Compounds
Y
Y (DDT, Dieldrin,
Disulfoton, PCBs,
Toxaphene)
Sediment/Turbidity
Y
N
Trash & Debris
Y
N
Oil & Grease
Y
N
Per the most recent Colorado River Basin Integrated Report (Category 5 2018 located here:
https://www.waterboards.ca.gov/coloradoriver/water issues/programs/tmdl/rb7 303d list.html) the Coachella Valley Stormwater Channel is impaired by Ammonia, DDT (Dichlorodiphenyltrichloroethane), Dieldrin, Disulfoton, Indicator Bacteria (Pathogens), Dissolved Oxygen, PCBs (Polychlorinated biphenyls), Toxaphene, and Toxicity.
NOTE: DDT, DIELDRIN, PCBs, AND TOXAPHENE ARE BANNED SUBSTANCES IN THE UNITED STATES. DISULFOTON IS A CANCELED PESTICIDE THAT IS NO LONGER PRODUCED IN THE UNITED STATES.
Pollutants of Concern: Based on the comparison of the potential project pollutants with the pollutant categories causing receiving water impairments, the pollutants of concern include bacteria/virus and toxic organic compounds. The project's proposed storm drain improvements are designed to intercept and retain the flood volume caused by the 24 -hour, 100 - year storm event. Therefore, this project will not produce runoff or pollutants that could affect offsite area or downstream resources, such as the proximate receiving waters.
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11-712
2014 Whitewater River Region WQMP
Skilled Nursing Facility
IV. Hydrologic Conditions of Concern
Local Jurisdiction Requires On -Site Retention of Urban Runoff:
Yes
No
The project will be required to retain urban runoff onsite in conformance with local ordinance (See Table 6 of the WQMP Guidance document, "Local Land use Authorities Requiring Onsite Retention of Stormwater"). This section does not need to be completed; however, retention facility design details and sizing calculations must be included in Appendix F.
This section must be completed.
This Project meets the following condition:
Condition A: 1) Runoff from the Project is discharged directly to a publicly -owned, operated and maintained MS4 or engineered and maintained channel, 2) the discharge is in full compliance with local land use authority requirements for connections and discharges to the MS4 (including both quality and quantity requirements), 3) the discharge would not significantly impact stream habitat in proximate Receiving Waters, and 4) the discharge is authorized by the local land use authority.
Condition B: The project disturbs less than 1 acre and is not part of a larger common plan of development that exceeds 1 acre of disturbance. The disturbed area calculation must include all disturbances associated with larger plans of development.
Condition C: The project's runoff flow rate, volume, velocity and duration for the post -development condition do not exceed the pre -development condition for the 2 - year, 24 -hour and 10 -year 24 -hour rainfall events. This condition can be achieved by, where applicable, complying with the local land use authority's on -site retention ordinance, or minimizing impervious area on a site and incorporating other Site - Design BMP concepts and LID/Site Design BMPs that assure non-exceedance of pre -development conditions. This condition must be substantiated by hydrologic modeling methods acceptable to the local land use authority. ❑ None: Refer to Section 3.4 of the Whitewater River Region WQMP Guidance document for additional requirements.
Supporting engineering studies, calculations, and reports are included in Appendix C. 2 year — 24 hour
10 year — 24 hour
Precondition
Post -condition
Precondition
Post -condition
Discharge (cfs)
Velocity (fps)
Volume (cubic feet)
Duration (minutes)
October 2023
1-8
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2014 Whitewater River Region WQMP
Skilled Nursing Facility
V. Best Management Practices
This project implements Best Management Practices (BMPs) to address the Pollutants of Concern that may potentially be generated from the use of the project site. These BMPs have been selected and implemented to comply with Section 3.5 of the WQMP Guidance document, and consist of Site Design BMP concepts, Source Control, LID/Site Design and, if/where necessary, Treatment Control BMPs as described herein.
V.1 SITE DESIGN BMP CONCEPTS, LID/SITE DESIGN AND TREATMENT CONTROL BMPs
Local Jurisdiction Requires On -Site Retention of Urban Runoff:
Yes
The project will be required to retain Urban Runoff onsite in conformance with local ordinance (See Table 6 of the WQMP Guidance document, "Local Land use Authorities Requiring Onsite Retention of Stormwater). The LID/Site Design measurable goal has thus been met (100%), and Sections V.1.A and V.1.B do not need to be completed; however, retention facility design details and sizing calculations must be included in Appendix F, and '100%' should be entered into Column 3 of Table 6 below.
No ❑ Section V.1 must be completed.
This section of the Project -Specific WQMP documents the LID/Site Design BMPs and, if/where necessary, the Treatment Control BMPs that will be implemented on the project to meet the requirements detailed within Section 3.5.1 of the WQMP Guidance document. Section 3.5.1 includes requirements to implement Site Design Concepts and BMPs, and includes requirements to address Pollutants of Concern with BMPs. Further, sub -section 3.5.1.1 specifically requires that Pollutants of Concern be addressed with LID/Site Design BMPs to the extent feasible.
LID/Site Design BMPs are those BMPs listed within Table 2 below which promote retention and/or feature a natural treatment mechanism; off -site and regionally -based BMPs are also LID/Site Design BMPs, and therefore count towards the measurable goal, if they fit these criteria. This project incorporates LID/Site Design BMPs to fully address the Treatment Control BMP requirement where and to the extent feasible. If and where it has been acceptably demonstrated to the local land use authority that it is infeasible to fully meet this requirement with LID/Site Design BMPs, Section V.1.B (below) includes a description of the conventional Treatment Control BMPs that will be substituted to meet the same requirements.
In addressing Pollutants of Concern, BMPs are selected using Table 2 below.
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Table 2. BMP Selection Matrix Based Upon Pollutant of Concern Removal Efficiency (1) (Sources: Riverside County Flood Control & Water Conservation District Design Handbook for Low Impact Development Best Management Practices, dated September 2011, the Orange County Technical Guidance Document for Water Quality Management Plans, dated May 19, 2011, and the Caltrans Treatment BMP Technology Report, dated April 2010 and April 2008)
Pollutant of
Concern
Landscape Swale2, 3
Landscape Stripe, 3
Biofiltration
(with underdrain)2, 3
Extended Detention
Basin2
Sand Filter Basin2
Infiltration Basin2
Infiltration Trench2
Permeable
Pavement2
Bioretention
(w/o underdrain)2, 3
Other BMPs Including
Proprietary BMPs4,6
Sediment &
Turbidity
M
M
H
M
H
H
H
H
H
Varies by Products
Nutrients
L/M
L/M
M
L/M
L/M
H
H
H
H
Toxic Organic
Compounds
M/H
M/H
M/H
L
L/M
H
H
H
H
Trash & Debris
L
L
H
H
H
H
H
L
H
Bacteria & Viruses
(also: Pathogens)
L
M
H
L
M
H
H
H
H
Oil & Grease
M
M
H
M
H
H
H
H
H
Heavy Metals
M
M/H
M/H
L/M
M
H
H
H
H
Abbreviations:
removal efficiency M: Medium removal efficiency H: High removal efficiency assessment and updating of the guidance provided by this table may be necessary. when designed in accordance with the most current edition of the document, "Riverside River Region Stormwater Quality Best Management Practice Design Handbook". dependent upon design which includes implementation of thick vegetative cover. Local water and/or landscaping requirements should be considered; approval is based on the discretion of the authority.
stormwater treatment devices as listed in the CASQA Stormwater Best Management Practices other stormwater treatment BMPs not specifically listed in this WQMP (including proprietary filters, separators, inserts, etc.), or newly developed/emerging stormwater treatment technologies. should be based on evaluation of unit processes provided by BMP and available testing is based on the discretion of the local land use authority. for primary treatment as opposed to pre-treatment, requires site -specific approval by the local land use L: Low
Notes:
(1) Periodic performance
(2) Expected performance
County, Whitewater
(3) Performance
conservation
local land use
(4) Includes proprietary
Handbooks,
hydrodynamic
(5) Expected performance
data. Approval
(6) When used
authority.
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V.1.A SITE DESIGN BMP CONCEPTS AND LID/SITE DESIGN BMPs This section is not applicable due to conformance with local retention ordinance per Section 3.5.1.2 of the Whitewater River Region WQMP Guidance Document.
This section documents the Site Design BMP concepts and LID/Site Design BMPs that will be implemented on this project to comply with the requirements detailed in Section 3.5.1 of the WQMP Guidance document.
• Table 3 herein documents the implementation of the Site Design BMP Concepts described in sub -sections 3.5.1.3 and 3.5.1.4.
• Table 4 herein documents the extent to which this project has implemented the LID/Site Design goals described in sub -section 3.5.1.1.
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Table 3. Implementation of Site Design BMP Concepts
This section is not applicable due to conformance with the local retention ordinance.
Included
Brief Reason for BMPs
Indicated as No or N/A
Design
Concept
Technique
Specific BMP
Yes
No
N/A
Site Design BMP Concept 1
Minimize Urban
Conserve natural areas by concentrating or clustering
development on the least environmentally sensitive portions of a site while leaving the remaining land in a natural, undisturbed condition.
❑
❑
❑
Conserve natural areas by incorporating the goals of the Multi - Species Habitat Conservation Plan or other natural resource plans.
❑
❑
❑
Preserve natural drainage features and natural depressional storage areas on the site.
❑
❑
❑
Maximize canopy interception and water conservation by
preserving existing native trees and shrubs, and planting additional native or drought tolerant trees and large shrubs. ❑
❑
❑
Runoff,
Minimize
Impervious
Footprint, and
Conserve
Natural Areas
(See WQMP
Section 3.5.1.3)
Use natural drainage systems.
❑
❑
❑
Where applicable, incorporate Self -Treating Areas
❑
❑
❑
Where applicable, incorporate Self -Retaining Areas
❑
❑
❑
Increase the building floor to area ratio (i.e., number of stories above or below ground).
❑
❑
❑
Construct streets, sidewalks and parking lot aisles to minimum widths necessary, provided that public safety and a walkable environment for pedestrians are not compromised.
❑
❑
❑
Reduce widths of streets where off-street parking is available. ❑
❑
❑
Minimize the use of impervious surfaces, such as decorative ❑
❑
❑
concrete, in the landscape design.
Other comparable and equally effective Site Design BMP
concept(s) as approved by the local land use authority (Note:
Additional narrative required to describe BMP and how it addresses site design concept).
❑
❑
❑
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Table 3. Site Design BMP Concepts (continued)
This section is not applicable due to conformance with the local retention ordinance.
Included
Design
Concept
Technique
Specific BMP
Yes
No
N/A
Brief Reason for Each BMP
Indicated as No or N/A
Site Design BMP Concept 2
Minimize
Directly
Connected
Impervious
Area
(See WQMP
Section
3.5.1.4)
October 2023
Design residential and commercial sites to contain and infiltrate roof runoff, or direct roof runoff to landscaped swales or buffer areas.
Drain impervious sidewalks, walkways, trails, and patios into adjacent landscaping.
Incorporate landscaped buffer areas between sidewalks and streets.
Use natural or landscaped drainage swales in lieu of underground piping or imperviously lined swales.
Where soil conditions are suitable, use perforated pipe or gravel filtration pits for low flow infiltration.
Maximize the permeable area by constructing walkways, trails, patios, overflow parking, alleys, driveways, low -traffic streets, and other low - traffic areas with open jointed paving materials or permeable surfaces such as pervious concrete, porous asphalt, unit pavers, and granular materials.
Use one or more of the following:
Rural swale system: street sheet flows to landscaped swale or gravel shoulder, curbs used at street corners, and culverts used under driveways and street crossings.
Urban curb/swale system: street slopes to curb; periodic swale inlets drain to landscaped swale or biofilter.
Dual drainage system: first flush captured in street catch basins and discharged to adjacent vegetated swale or gravel shoulder; high flows connect directly to MS4s.
Other comparable and equally effective Site Design BMP concept(s) as approved by the local land use authority (Note: Additional narrative required to describe BMP and how it addresses site design concept).
Use one or more of the following for design of driveways and private residential parking areas:
Design driveways with shared access, flared (single lane at street), or wheel strips (paving only under the tires).
Uncovered temporary or guest parking on residential lots paved with a permeable surface, or designed to drain into landscaping. 1-13
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Table 3. Site Design BMP Concepts (continued)
This section is not applicable due to conformance with the local retention ordinance.
Included
Design
Concept
Technique
Specific BMP
Yes
No
N/A
Brief Reason for Each BMP
Indicated as No or N/A
Minimize
Directly
Connected
Impervious
Area
(See WQMP
Section
3.5.1.4)
Other comparable and equally effective Site Design BMP concept(s) as approved by the local land use authority (Note: Additional narrative required to describe BMP and how it addresses site design concept).
Use one or more of the following for design of parking areas:
Where landscaping is proposed in parking areas, incorporate parking area landscaping into the drainage design.
Overflow parking (parking stalls provided in excess of the Permittee's minimum parking requirements) may be constructed with permeable pavement.
Other comparable and equally effective Site Design BMP (or BMPs) as approved by the local land use authority (Note: Additional narrative required describing BMP and how it addresses site design concept).
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Project Site Design BMP Concepts:
This section is not applicable due to conformance with local retention ordinance per Section
3.5.1.2 of the Whitewater River Region WQMP Guidance Document.
Alternative Project Site Design BMP Concepts:
N/A
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Table 4. LID/Site Design BMPs Meeting the LID/Site Design Measurable Goal This section is not applicable due to conformance with the local retention ordinance. (1)
DRAINAGE
SUB -AREA
ID OR NO.
(2)
LID/SITE DESIGN BMP
TYPE*
(See Table 2)
(3)
POTENTIAL POLLUTANTS
OF CONCERN WITHIN
DRAINAGE SUB -AREA
(Refer to Table 1)
(4)
POTENTIAL
POLLUTANTS
(5)
EFFECTIVENESS
OF LID/SITE
DESIGN BMP AT
ADDRESSING
IDENTIFIED
POTENTIAL
POLLUTANTS
(U, L, M, H/M, H; see
Table 2)
(6)
BMP MEETS
WHICH
DESIGN
CRITERIA?
(Identify as
Vanua OR Qamp)
(7)
TOTAL
AREA
WITHIN SUB-
AREA CAUSING
RECEIVING
WATER
IMPAIRMENTS
(Refer to Table 1)
WITHIN
DRAINAGE
SUB -AREA
(Nearest 0.1 acre)
TOTAL PROJECT AREA TREATED WITH LID/SITE DESIGN BMPs (NEAREST 0.1 ACRE) * LID/Site Design BMPs listed in this table are those that completely address the 'Treatment Control BMP requirement' for their drainage sub -area.
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Justification of infeasibility for sub -areas not addressed with LID/Site Design BMPs This section is not applicable due to conformance with the local retention ordinance.
V.1.B TREATMENT CONTROL BMPs
Conventional Treatment Control BMPs shall be implemented to address the project's Pollutants of Concern as required in WQMP Section 3.5.1 where, and to the extent that, Section V.1.A has demonstrated that it is infeasible to meet these requirements through implementation of LID/Site Design BMPs.
The LID/Site Design BMPs described in Section V.1.A of this project -specific WQMP completely address the 'Treatment Control BMP requirement' for the entire project site (and where applicable, entire existing site) as required in Section 3.5.1.1 of the WQMP Guidance document. Supporting documentation for the sizing of these LID/Site Design BMPs is included in Appendix F. *Section V.1.B does not need to be completed.
The LID/Site Design BMPs described in Section V.1.A of this project -specific WQMP do NOT completely address the 'Treatment Control BMP requirement' for the entire project site (or where applicable, entire existing site) as required in Section 3.5.1.1 of the WQMP. *Section V.1.B must be completed.
The Treatment Control BMPs identified in this section are selected, sized and implemented to treat the design criteria of VBMP and/or QBMP for all project (and if required, existing site) drainage sub -areas which were not fully addressed using LID/Site Design BMPs. Supporting documentation for the sizing of these Treatment Control BMPs is included in Appendix F.
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Table 5: Treatment Control BMP Summary
This section is not applicable due to conformance with local retention ordinance per Section 3.5.1.2 of the Whitewater River Region WQMP Guidance Document.
(1)
DRAINAGE
SUB -AREA
ID OR NO.
(2)
TREATMENT
CONTROL BMP
TYPE*
(See Table 2)
(3)
POTENTIAL
POLLUTANTS OF
(4)
POTENTIAL
POLLUTANTS
(5)
EFFECTIVENESS OF
TREATMENT
CONTROL BMP AT
ADDRESSING
(6)
BMP MEETS
WHICH
DESIGN
CRITERIA?
(Identify as
VBMP OR QBMP)
(7)
TOTAL
AREA
CONCERN WITHIN
DRAINAGE SUB -AREA
(Refer to Table 1)
WITHIN SUB -AREA
CAUSING
RECEIVING
WATER
IMPAIRMENTS
(Refer to Table 1)
WITHIN
DRAINAGE
SUB -AREA
(Nearest 0.1
acre)
IDENTIFIED
POTENTIAL
POLLUTANTS
(U, L, M, H/M, H; see Table
2)
TOTAL PROJECT AREA TREATED WITH TREATMENT CONTROL BMPs (NEAREST 0.1 ACRE) October 2023
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V.1.0 MEASURABLE GOAL SUMMARY
This section documents the extent to which this project has met the measurable goal described in WQMP Section 3.5.1.1 of addressing 100% of the project's 'Treatment Control BMP requirement' with LID/Site Design BMPs. Projects required to retain Urban Runoff onsite in conformance with local ordinance are considered to have met the measurable goal; for these instances, '100%' is entered into Column 3 of the Table.
Table 6: Measurable Goal Summary
(1)
Total Area Treated with
LID/Site Design BMPs
(2)
Total Area Treated with
Treatment Control BMPs
(3)
% of Treatment Control BMP
Requirement addressed with
LID/Site Design BMPs
(Last row of Table 4)
(Last row of Table 5)
100%
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V.2 SOURCE CONTROL BMPs
This section identifies and describes the Source Control BMPs applicable and implemented on this project.
Table 7. Source Control BMPs
BMP Name
Check One
If not applicable, state
brief reason
Included
Not
Applicable
Non -Structural Source Control BMPs
Education for Property Owners, Operators,
Tenants, Occu ants, or Em to ees
-1
Activity Restrictions
❑
a
Irrigation System and Landscape Maintenance
❑
a
Common Area Litter Control
❑
/1
Street Sweeping Private Streets and Parking Lots
n
0 Drainage Facility Inspection and Maintenance
a
Structural Source Control BMPs 1
Storm Drain Inlet Stenciling and Signage
❑
a
Landscape and Irrigation System Design
❑
a
Protect Slopes and Channels
I1
Car Wash Racks
Provide Communi 'Lim
❑
Not a part of the project
Properly Design*: 111 1T
Fueling Areas
❑
Not a part of the project
0 Air/Water Supply Area Drainage
❑
Not a part of the project
a
Trash Storage Areas
❑
a
Loading Docks
❑
Not a part of the project
a
Maintenance Bays
❑
Not a part of the project
L
Vehicle and Equipment Wash Areas
❑
Not a part of the project
a
Outdoor Material Storage Areas
❑
Not a part of the project
►/
Outdoor Work Areas or Processing Areas
❑
Not a part of the project
/1
Provide Wash Water Controls for Food
Preparation Areas
❑
Not a part of the project
/1
*Details demonstrating proper design must be included in Appendix F.
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Non -Structural Source Control BMPs:
Education for Property Owners and Employees:
Practical information materials to promote the prevention of Urban Runoff pollution will be provided by the project proponent to the owner. These materials will include general housekeeping practices that contribute to the protection of urban runoff quality and the BMPs that eliminate or reduce pollution. These materials or a resource list for obtaining these materials will be made available through the local land use authority. BMP training and education programs must be provided to all employees who will be employed or contracted to perform activities that may impact Urban Runoff.
Activity Restrictions:
Activity Restrictions will be dictated by property owners. Examples of restricted activities include: the blowing, sweeping, or hosing of debris (leaf litter, grass clippings, litter, etc.) into streets, storm drain inlets, or other conveyances is prohibited, and dumpster lids must be closed at all times.
Irrigation System and Landscape Maintenance:
Maintenance of the irrigation systems and landscaping shall be consistent with the local land use authority's water conservation ordinance, which can be accessed through the local land use authority's website or obtained through the local land use authority's planning/permitting counter. Fertilizer and pesticide usage shall be consistent with the instructions contained on product labels and with regulations administered by California's Department of Pesticide Regulation. Landscape maintenance must also address the replacement of dead vegetation, repair of erosion rills, proper disposal of green waste, etc. Irrigation system maintenance must address periodic testing and observation of the irrigation system to detect overspray, broken sprinkler heads, and other system failures. Proper routine irrigation system and landscape maintenance will also serve as a vector control measure due to the minimization of nuisance water runoff and stagnation.
Common Area Litter Control:
Trash receptacles must be provided in common areas. Common areas and perimeter fences or walls must be patrolled to collect litter and to notice locations where excessive litter is occurring in order to implement prevention practices such as post public signage, install additional trash receptacles, or increase frequency of emptying trash receptacles.
Street Sweeping Private Streets and Parking Lots:
Paved area sweeping prevents sediment, litter, and other debris from being washed by runoff into the on -site storm drain system and basin. Paved area sweeping should be performed during dry weather if possible. The frequency of sweeping privately owned streets shall be no less than the frequency of street sweeping by the local land use authority on public streets. All collected debris should be transported to an appropriate disposal facility.
Drainage Facility Inspection and Maintenance:
Drainage facilities (catch basins, open channels, and storm drain inlets) shall, at a minimum, take place in the late summer or early fall, prior to the start of the rainy season. The drainage facilities must be cleaned if accumulated sediment/debris fills 25% or more of the sediment/debris storage October 2023 1-21
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capacity. Privately owned drainage facilities shall be inspected annually, and the cleaning frequency shall be assessed by the responsible party.
Structural Source Control BMPs
Storm Drain Inlet Stenciling and Signage:
The project will incorporate measures to discourage illegal dumping in the storm drain system.
Stencils and signs alert the public to the destination of pollutants discharged into Urban Runoff.
Stenciling or labeling of all storm drain inlets and catch basins, constructed or modified, within the project area with prohibitive language (such as: "NO DUMPING ONLY RAIN IN THE DRAIN") and/or geographical icons shall be provided to discourage illegal dumping at public access points within the project area. Graphical icons, either illustrating anti -dumping symbols or images of Receiving Water fauna, are effective supplements to text messages. The legibility of stencils and signs must be maintained by the responsible party.
Landscape and Irrigation System Design:
The landscape plan prepared and implemented must be consistent with the local land use authority's water conservation ordinance, which may include the use of water sensors, programmable irrigation times (for short cycles), etc. The landscape plan shall: utilize plants with low irrigation requirements (native or drought tolerant species), group plants with similar water requirements in order to reduce excess irrigation runoff and promote surface infiltration, use mulches (such as wood chips or shredded wood products) in planter areas without ground cover to minimize sediment in runoff, install appropriate plant materials for the location, in accordance with amount of sunlight and climate, and use native plant material where possible and/or as recommended by the landscape architect, maintain or create a vegetative barrier along the property boundary and interior watercourses, to act as a pollutant filter, where appropriate and feasible, and choose plants that minimize or eliminate the use of fertilizer or pesticides to sustain growth. Rain shutoff devices will be employed to prevent irrigation during and after precipitation events and the irrigation systems must be designed to each landscape area's specific water requirements. Flow reducers or shutoff valves triggered by a pressure drop to control water loss due to broken sprinkler heads or lines will be used. The timing and application methods of irrigation water shall be designed to minimize the runoff of excess irrigation water into the MS4.
Other methods may be used in place if equally effective to reduce irrigation water runoff.
Protect Slopes and Channels:
The following design principles shall be considered, incorporated, and implemented where determined applicable and feasible by the local land use authority to decrease the potential for erosion of slopes and/or channels. Runoff should be conveyed safely from the tops of slopes, avoid disturbing steep or unstable slopes and natural channels and install permanent stabilization BMPs on disturbed slopes as quickly as possible. Plant slopes with native or drought tolerant vegetation and hillside areas that are disturbed shall be landscaped with deep-rooted, drought tolerant plant species selected for erosion control. Control and treat flows in landscaping and/or other controls prior to reaching existing natural drainage systems. Install permanent stabilization BMPs in channel crossings as quickly as possible and ensure that increases in runoff velocity and frequency caused by the project do not erode the channel. Install energy dissipaters at the outlets of new MS4s, culverts, conduits, or channels that enter unlined channels in accordance with applicable specifications to minimize erosion. Energy dissipaters shall be installed in such a way as to minimize impacts to Receiving Waters. Onsite conveyance channels should be lined, where October 2023 1-22
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appropriate, to reduce erosion caused by increase flow velocity due to increases in tributary impervious area. The first choice for linings should be grass or some other vegetative surface, since these materials not only reduce runoff velocities, but also provide water quality benefits from filtration and infiltration. If velocities in the channel are large enough to erode grass or other vegetative linings, riprap, concrete soil cement or geo-grid stabilization may be substituted or used in combination with grass or other vegetation stabilization. Other comparable and equally effective site design options may be used as approved by the local land use authority.
Properly Design:
Trash Storage Areas:
All trash container areas shall meet the following requirements: paved with an impervious surface, designed to not allow run-on from adjoining roofs or pavements and to prevent off -site transport of trash. Trash dumpsters shall be leak proof and have attached lids or covers.
Connection of trash area drains to the MS4 is prohibited.
Appendix D includes copies of the educational materials (described in Section 3.5.2.1 of the WQMP Guidance document) that will be used in implementing this project -specific WQMP.
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V.3 EQUIVALENT TREATMENT CONTROL BMP ALTERNATIVES
Not applicable.
V.4 REGIONALLY -BASED BMPs
Not applicable.
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VI. Operation and Maintenance Responsibility for
BMPs
Appendix G of the Final project -specific WQMP will include copies of CC&Rs, Covenant and Agreements, BMP Maintenance Agreement and/or other mechanisms used to ensure the ongoing operation, maintenance, funding, transfer and implementation of the project -specific WQMP requirements. The following maintenance recommendations, which include the responsible parties, inspection intervals, and maintenance intervals, are not intended to be exhaustive in nature and should not serve as the sole source of on -site operating procedures. Where applicable, refer to the equipment manufacturer's recommendations, other relevant maintenance recommendations and the Declaration of Covenants, Conditions and Restrictions, Reservation of Easements that apply to this site.
The owner will be the responsible party for all operation and maintenance activities, including inspections and record keeping for a minimum of 50 years. The owner may appoint a maintenance company that will execute these responsibilities. All implementation for operation and maintenance will occur post -construction.
Irrigation System and Landscape:
0 and M Activities
Schedule and Frequency
1. Inspect and repair broken sprinklers.
Inspect weekly and replace immediately
2. Repair broken water lines.
Inspect daily and repair immediately.
3. Inspect irrigated areas for signs of erosion
and/ or discharge.
Inspect weekly repair source of erosion or
discharge immediately.
Common Area Litter Control:
0 and M Activities
Schedule and Frequency
4. Ensure preventative signage maintains
legibility and visibility.
As needed.
5. Continuously look out for litter and clean up
immediately.
Continuous inspection while performing duties.
6. Add trash cans where littering is prominent
and can be mediated.
As needed.
Street Sweeping of Private Streets and Parking Lots:
0 and M Activities
Schedule and Frequency
7. Inspect for tracked sediment or blow sand.
Visible sediment tracking should be swept
immediately.
Inspect monthly. Sweeping operations should
occur on a basis in conformance with the local
land use authority.
8. Adjust brooms frequently; maximize
efficiency of sweeping efforts.
As needed.
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Drainage Facilities:
0 and M Activities
Schedule and Frequency
9. Inspect, repair, and replace any broken or
buried drain grates.
Inspect weekly and replace immediately.
10. Inspect and remove trash and debris from
catch basin inlets and storm drain mains. If
sediment or trash exists remove and dispose
as directed hereon.
Inspect prior to the rainy season (September) and
after the rainy season (April). Provide
performance inspections subsequent to all rain
events.
11. Inspect catch basins and re -apply stenciling
and/or signage when necessary.
Inspect annually and as needed.
Protect Slopes and Channels*:
0 and M Activities
Schedule and Frequency
12. Inspect slopes and channels. Remove any
litter/debris within channels or swales
conveying stormwater runoff. Provide
stabilized slopes and outlet structures.
As needed.
*No channels are proposed for this development.
Trash Storage Areas:
0 and M Activities
Schedule and Frequency
1. Inspect Trash Storage Area and pick up any
stray debris and trash within the storage area.
Inspect daily.
2. Ensure that trash receptacles are emptied on a
weekly basis.
Inspect weekly.
3. Recyclables should be separated from
disposable trash.
Inspect daily.
Retention Basin (Infiltration BMP):
0 and M Activities
Schedule and Frequency
13. Inspect all inlets to the retention area, make
sure inlets are free of debris and sediment.
Inspect inlets for sediment accumulation and
clean and remove trash when encountered.
Inspect prior to the rainy season (September) and
after the rainy season (April). Inspect prior and
after all rain events.
14. Inspect the retention basin, replace landscaping
as needed within the basin, and remove
silt/blowsand and debris in the basin.
Retention basins should be kept clear of trash,
debris, and silt/blowsand buildup on a monthly
basis. This should be given a high priority.
Responsible Party:
Advanced Health Care
310 W. Park Lane
Farmington, UT 84025
Telephone: TBD
Contact Person: Jeffrey L. Gallon
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Note: Sediment, other pollutants, and all other waste shall be properly disposed of in a licensed landfill or by another appropriate disposal method in accordance with local, state, and federal regulations.
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Skilled Nursing Facility
VII. Funding
The Property title holder shall carry primary responsibility for the initial funding of installations, design, and implementation of site -specific BMP's. Ongoing inspections, routine maintenance, and some instances of reactionary maintenance shall be funded by the property owner, in such that they will make an agreement with contractors, tenants, or other parties in direct access and knowledge of the property to pay for any and all aspects of the necessary maintenance and inspections.
Continued funding for ongoing inspections and maintenance shall be passed to any and all future title holders and awareness must be made of this obligation in conjunction with the title. In addition, any future property owners, managers, tenants, or contractors must be made aware of the sites structural BMP's and have access to their associated educational materials that are to be kept on site, within the site's respective building as well as held by the property owner, and title company or others who may possess the title or deed to the property.
Any amended versions of the funding declaration may be submitted to all applicable parties in the future, should such an action be warranted. All changes must be submitted for review by Advanced Health Care, as per their standards and requirements for altering this document.
Appendix G of this project -specific WQMP also includes copies of Covenants and Agreements, BMP Maintenance Agreement and/or other mechanisms used to ensure the ongoing operation, maintenance, funding, transfer and implementation of the project -specific WQMP requirements.
Property Owner:
Advanced Health Care
310 W. Park Lane
Farmington, UT 84025
Telephone: TBD
Contact Person: Jeffrey L. Gallon
October 2023 1-28
11-733
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Appendix A
Conditions of Approval
To be provided in Final WQMP
Planning Commission Resolution
Dated
11-734
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Appendix B
Vicinity Map, WQMP Site Plan, Receiving Waters Map
11-735
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11-737
I 1
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WRITEINATER MS4 PERMIT BOUNDARY
WHITEWATER RIVER WATERSHED BO UNDARY
RECE IVING WATERS - LINES
RE CEIVING WATER S - POLYS
COUNTY BOUNDA RY
THOUSAND PALMS CANYON CRE EK
WE ST C ATHEDR AL CAN YON CHANN EL
EAST CA TH EDRAL -CANY ON CH ANN EL
EAST)I M AG NESIA AN YO N CHANN EL
DEE P CANYON STORMWAT ER CHANNEL
CAHUIL
LA QUI NTA,EV ACUA TION C
LA QUINTA RESORT CHANNEL
BEAR CREEK
COYOT E CREEK
H ANN EL
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Appendix C
Supporting Detail Related to Hydrologic Conditions of Concern N/A See Appendix F
11-739
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Appendix D
Educational Materials
SD -10 Site Design and Landscape Planning
SD -12 Efficient Irrigation
SD -13 Storm Drain System Signs
SD -32 Trash Enclosures
SC -10 Non-Stormwater Discharges
SC -11 Spill Prevention, Control & Cleanup
SC -41 Building & Grounds Maintenance
SC -60 Housekeeping Practices
SC -61 Safer Alternative Products
SC -70 Road and Street Maintenance
SC -71 Plaza and Sidewalk Cleaning
SC -73 Landscape Maintenance
SC -74 Drainage System Maintenance
SC -75 Waste Handling and Disposal
SC -76 Water and Sewer Utility Maintenance
TC-11 Infiltration Basin
Coachella Valley Vector Control Information
11-740
Site Design & Landscape Planning SD -10
Design Objectives
Maxirrize Infiltration
Provide Retention
Sow Runoff
Mninize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Each project site possesses uniquetopographic, hydrologic, and vegetative features, some of which are more suitable for development than others. Integrating and incorporating appropriate landscape planning methodologies into the project design is the most effective action that can be done to minimize surface and groundwater contamination from stormwater.
Approach
Landscape planning should couple consideration of land suitability for urban useswith consideration of community goals and projected growth. Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment.
Design Considerations
Design requirements for site design and landscapes planning should conform to applicable standards and specifications of agencieswith jurisdiction and be consistent with applicable General Plan and Local Area Plan policies.
CA LI€OR V I -A 4n iMK 9 TEN
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
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SD -10 Site Design & Landscape Planning
Designing New Installations
Begin the development of a plan for the landscape unit with attention to thefollowing general principles:
■ Formulate the plan on the basis of clearly articulated community goals. Carefully identify conflicts and choices between retaining and protecting desired resources and community growth.
■ Map and assess land suitability for urban uses. Include the following landscapefeatures in the assessment: wooded land, open unwooded land, steep slopes, erosion -prone soils, foundation suitability, soil suitability for waste disposal, aquifers, aquifer recharge areas, wetlands, floodplains, surface waters, agricultural lands, and various categories of urban land use. When appropriate, the assessment can highlight outstanding local or regional resources that the community determines should be protected (e.g., a scenic area, recreational area, threatened species habitat, farmland, fish run). Mapping and assessment should recognize not only these resources but also additional areas needed for their sustenance.
Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels.
Conserve Natural Areas during Landscape Planning
If applicable, thefollowing items are required and must be implemented in the site layout during the subdivision design and approval process, consistent with applicable General Plan and Local Area Plan policies:
■ Cluster development on least -sensitive portions of a site while leaving the remaining land in a natural undisturbed condition.
■ Limit clearing and grading of nativevegetation at a siteto the minimum amount needed to build lots, allow access, and provide fire protection.
■ Maximize trees and other vegetation at each site by planting additional vegetation, clustering tree areas, and promoting the use of native and/ or drought tolerant plants. ■ Promote natural vegetation by using parking lot islands and other landscaped areas. ■ Preserve riparian areas and wetlands.
Maximize Natural Water Storageand Infiltration Opportunities Within the Landscape Unit ■ Promote the conservation of forest cover. Building on land that is already deforested affects basin hydrology to a lesser extent than converting forested land. Loss of forest cover reduces interception storage, detention in theorganicforest floor layer, and water losses by evapotranspiration, resulting in large peak runoff increases and either their negative effects or the expense of countering them with structural solutions. ■ Maintain natural storage reservoirs and drainage corridors, including depressions, areas of permeable soils, swales, and intermittent streams. Develop and implement policies and 2 of 4 California Stormwater BMP Handbook
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11-742
Site Design & Landscape Planning SD -10
regulationsto discouragethe clearing, filling, and channelization of thesefeatures. Utilize them in drainage networks in preference to pipes, culverts, and engineered ditches. ■ Evaluating infiltration opportunities by referring to the stormwater management manual for the jurisdiction and pay particular attention to the selection criteria for avoiding groundwater contamination, poor soils, and hydrogeological conditions that cause these faciliti es to fail. If necessary, locate developments with large amounts of impervious surfaces or a potential to produce relatively contaminated runoff away from groundwater recharge areas.
Protection of Slopes and Channels during Landscape Design ■ Convey runoff safely from the tops of slopes.
■ Avoid disturbing steep or unstable slopes.
■ Avoid disturbing natural channels.
■ Stabilize disturbed slopes as quickly as possible.
■ Vegetate slopes with native or drought tolerant vegetation. ■ Control and treat flows in landscaping and/or other controls prior to reaching existing natural drainage systems.
■ Stabilize temporary and permanent channel crossings as quickly as possible, and ensure that increases in run-off velocity and frequency caused by the project do not erode the channel. ■ Install energy dissipaters, such as riprap, at the outlets of new storm drains, culverts, conduits, or channels that enter unlined channels in accordance with applicable specifications to minimize erosion. Energy dissipaters shall be installed in such awayasto minimize impacts to receiving waters.
■ Line on -site conveyance channels where appropriate, to reduce erosion caused by increased flow velocity due to increases in tributary impervious area. Thefirst choice for linings should be grass or some other vegetative surface, since these materials not only reduce runoff velocities, but also provide water quality benefits from filtration and infiltration. If velocities in the channel are high enough to erode grass or other vegetative linings, riprap, concrete, soil cement, or geo-grid stabilization are other alternatives. ■ Consider other design principles that are comparable and equally effective.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans(SUSMP, WQMP, etc.) define"redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activitieswith structural or impervious surfaces. The defi nition of" redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should befollowed.
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
11-743
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SD -10 Site Design & Landscape Planning
Redevelopment may present significant opportunity to add features which had not previously been implemented. Examples include incorporation of depressions, areas of permeable soils, and swales in newly redeveloped areas. While some site constraints may exist due to the status of already existing infrastructure, opportunities should not be missed to maximize infiltration, slow runoff, reduce impervious areas, disconnect directly connected impervious areas.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002.
Stormwater Management Manual for Western Washington, Washington State Department of Ecology, August 2001.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQM P) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002.
4 of 4 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
January 2003
11-744
Rain Garden
Roof Runoff Controls SD -11
Design Objectives
Q IVIaArrize Infiltration
Q Provide Retention
El Slow Runoff
Nininize Irrpervious Land
Coverage
Prohibit Dunping of Inproper
Materials
El Contain Pollutants
Collect and Convey
Description
Various roof runoff controls are avai lable to address stormwater that drains off rooftops. The objective is to reduce the total volume and rate of runoff from individual lots, and retain the pollutants on site that may be picked up from roofing materials and atmospheric deposition. Roof runoff controls consist of directing the roof runoff away from paved areas and mitigating flow to the storm drain system through one of several general approaches: cisterns or rain barrels; dry wells or infiltration trenches; pop-up emitters, and foundation planting. The first three approaches require the roof runoff to be contained in a gutter and downspout system. Foundation planting provides a vegetated strip under the drip line of the roof.
Approach
Design of individual lots for single-family homes as well aslotsfor higher density residential and commercial structures should consider site design provisions for containing and infiltrating roof runoff or directing roof runoff to vegetative swales or buffer areas. Retained water can be reused for watering gardens, lawns, and trees. Benefits to the environment i nclude reduced demand for potable water used for irrigation, improved stormwater quality, increased groundwater recharge, decreased runoff volume and peak flows, and decreased flooding potential.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment.
Design Considerations
Designing New Installations
Cisterns or Rain Barrels
One method of addressing roof runoff is to direct roof downspouts to cisterns or rain barrels. Acistern is an aboveground storage vessel with either a manually operated valve or a permanently open outlet. Roof runoff is temporarily stored and then released for irrigation or infiltration between storms. The number of rain CALI€ORVI-A STCBMW VT EN
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbook.com
11-745
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SD -11 Roof Runoff Controls
barrels needed is a function of the rooftop area. Some low impact developers recommend that every house have at least 2 rain barrels, with a minimum storage capacity of 1000 liters. Roof barrels serve several purposes including mitigating thefirst flush from the roof which has a high volume, amount of contaminants, and thermal load. Several types of rain barrels are commercially available. Consideration must be given to selecting rain barrels that are vector proof and childproof. In addition, some barrels are designed with a bypass valve that filters out grit and other contaminants and routes overflow to a soak -away pit or rain garden.
If the cistern has an operable valve, the valve can be closed to store stormwater for irrigation or infiltration between storms. This system requires continual monitoring by the resident or grounds crews, but provides greater flexibility in water storage and metering. If a cistern is provided with an operable valve and water is stored inside for long periods, the cistern must be covered to prevent mosquitoes from breeding.
A cistern system with a permanently open outlet can also provide for metering stormwater runoff. If the cistern outlet is significantly smaller than the size of the downspout inlet (say 1/4 to 1/2 inch diameter), runoff will build up inside the cistern during storms, and will empty out slowly after peak intensities subside. This isafeasiblewaytomitigatethepeakflowincreases caused by rooftop impervious land coverage, especially for the frequent, small storms.
Dry wells and Infiltration Trenches
Roof downspouts can be directed to dry wells or infiltration trenches. A dry well is constructed by excavating a hole in the ground and filling it with an open graded aggregate, and allowing the water to fill the dry well and infiltrate after the storm event. An underground connection from the downspout conveys water into the dry well, allowing it to be stored in the voids. To minimize sedimentation from lateral soil movement, the sides and top of the stone storage matrix can be wrapped in a permeable filter fabric, though the bottom may remain open. A perforated observation pipe can be inserted vertically into the dry well to allow for inspection and maintenance.
In practice, dry wells receiving runoff from single roof downspouts have been successful over long periods because they contain very little sediment. They must be sized according to the amount of rooftop runoff received, but are typically 4 to 5 feet square, and 2 to 3 feet deep, with a minimum of 1 -foot soil cover over the top (maximum depth of 10 feet).
To protect the foundation, dry wells must be set away from the building at least 10 feet. They must be installed in solids that accommodate infiltration. In poorly drained soils, dry wells have very limited feasibility.
Infiltration trenchesfunction in a similar manner and would be particularly effectivefor larger roof areas. An infiltration trench is a long, narrow, rock -filled trench with no outlet that receives stormwater runoff. Thesearedescribed under Treatment Controls.
Pop-up Drainage Emitter
Roof downspouts can be directed to an underground pipe that daylights some di stance from the building foundation, releasing the roof runoff through a pop-up emitter. Similar to a pop-up irrigation head, the emitter only opens when there is flow from the roof. The emitter remains flush to the ground during dry periods, for ease of lawn or landscape maintenance. 2 of 3 California Stormwater BMP Handbook
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Roof Runoff Controls SD -11
Foundation Planting
Landscape planting can be provided around the base to allow increased opportunities for stormwater infiltration and protect thesoil from erosion caused by concentrated sheet flow coming off the roof. Foundation plantings can reduce the physical impact of water on the soil and provide a subsurface matrix of roots that encourage infiltration. These plantings must be sturdy enough to tolerate the heavy runoff sheet flows, and periodic soil saturation.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans(SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or i mpervious surfaces. The definition of" redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should befollowed.
Supplemental I nformation
Examples
■ City of Ottawa's Water Links Surface —Water Quality Protection Program ■ City of Toronto Downspout Disconnection Program
■ City of Boston, MA, Rain Barrel Demonstration Program Other Resources
Hager, Marty Catherine, Stormwater, "Low -Impact Development", January/ February 2003. www.stormh2o.com
Low Impact Urban Design Tools, Low Impact Development Design Center, Beltsville, MD. www.lid-stormwater.net
Start at the Source, Bay Area Stormwater Management Agencies Association, 1999 Edition January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbook.com
11-747
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Efficient Irrigation SD -12
Design Objectives
Q IVIaArrize Infiltration
Q Provide Retention
El Slow Runoff
Minimize Irrpervious Land
Coverage
Prohibit Dunping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Irrigation water provided to landscaped areas may result in excess irrigation water being conveyed into stormwater drainage systems.
Approach
Project plan designs for development and redevelopment should i nclude application methods of irrigation water that minimize runoff of excess irrigation water into the stormwater conveyance system.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.)
Design Considerations
Designing New Installations
The following methods to reduce excessive irrigation runoff should be considered, and incorporated and implemented where determined applicable and feasible by the Permittee:
• Employ rain -triggered shutoff devices to prevent irrigation after precipitation. • Design irrigation systems to each landscape area's specific water requirements. • Include design featuring flow reducers or shutoff valves triggered by a pressure drop to control water loss in the event of broken sprinkler heads or lines.
• 1 mplement landscape plans consistent with County or City water conservation resolutions, which may include provision of water sensors, programmable irrigation times (for short cycles) , etc.
1 of 2
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
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11-748
SD -12 Efficient Irrigation
■ Design timing and application methods of irrigation water to minimize the runoff of excess irrigation water into the storm water drainagesystem.
■ Group plants with similar water requirements in order to reduce excess irrigation runoff and promotesurfacefiltration. Choose plants with low irrigation requirements (for example, native or drought tolerant species). Consider design features such as:
- Using mulches (such as wood chips or bar) in planter areas without ground cover to minimizesediment in runoff
Installing appropriate plant materialsfor the location, in accordancewith amount of sunlight and climate, and use native plant materials where possible and/or as recommended by the landscape architect
Leaving a vegetative barrier along the property boundary and interior watercourses, to act asa pollutant filter, where appropriate and feasible Choosing plants that minimize or eliminatetheuse of fertilizer or pesticides to sustain growth
■ Employ other comparable, equally effective methods to reduce irrigation water runoff.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans(SUSMP, WQMP, etc.) defi ne "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activitieswith structural or impervious surfaces. The definition of " redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should befollowed.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura CountywideTechnical Guidance Manual for Stormwater Quality Control Measures, July 2002.
2 of 2 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
January 2003
11-749
Storm Drain Signage SD -13
Design Objectives
MaAnize Infiltration
Provide Retention
Slow Runoff
Mninize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Waste materials dumped into storm drain inlets can havesevereimpactson receiving and ground waters. Posting notices regarding discharge prohibitions at storm drain inlets can prevent waste dumping. Storm drain signs and stencils are highly visible source controls that are typically placed directly adjacent to storm drain inlets.
Approach
The stencil or affixed sign contains a brief statement that prohibits dumping of improper materials into the urban runoff conveyance system. Storm drain messages have become a popular method of alerting the public about the effects of and the prohibitions against waste disposal.
Suitable Applications
Stencils and signs alert the public to the destination of pollutants discharged to the storm drain.
Signs are appropriate in residential, commercial, and industrial areas, aswell as any other area where contributions or dumping to storm drains is likely.
Design Considerations
Storm drain message markers or placards are recommended at all storm drain inlets within the boundary of a development project. The marker should be placed in clear sight facing toward anyone approaching the inlet from either side. All storm drain inlet locations should be identified on the development site map.
Designing New Installations
The following methods should be considered for inclusion in the project design and show on project plans:
• Provide stenciling or labeling of all storm drain inlets and catch basins, constructed or modified, within the project area with prohibitive language. Examples include"NO DUMPING
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— DRAINS TO OCEAN" and/or other graphical icons to discourage illegal dumping. • Post signs with prohibitive language and/or graphical icons, which prohibit illegal dumping at public access points along channels and creeks within the project area.
Note - Some local agencies have approved specific signage and/or storm drain message placards for use. Consult local agency stormwater staff to determine specific requirements for placard types and methods of application.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. If the project meets the definition of "redevelopment", then the requirements stated under " designing new installations" above should be included in all project design plans.
Additional Information
Maintenance Considerations
• Legibility of markers and signs should be maintained. If required by the agency with jurisdiction over the project, the owner/operator or homeowner's association should enter into a maintenance agreement with the agency or record a deed restriction upon the property title to maintain the legibility of placards or signs.
Placement
• Signage on top of curbs tends to weather and fade.
• Signage on face of curbs tends to be worn by contact with vehicle tires and sweeper brooms.
Supplemental Information
Examples
• Most MS4 programs have storm drain signage programs. Some MS4 programs will provide stencils, or arrange for volunteers to stencil storm drains as part of their outreach program.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002.
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Trash Storage Areas
SD -32
Description
Trash storage areas are areas where a trash receptacle (s) are located for use as a repository for solid wastes. Stormwater runoff from areas where trash is stored or disposed of can be polluted. In addition, loose trash and debris can be easily transported by water or wind into nearby storm drain inlets, channels, and/or creeks. Waste handling operations that may be sources of stormwater pollution include dumpsters, litter control, and waste piles.
Approach
This fact sheet contains details on the specific measures required to prevent or reduce pollutants in stormwater runoff associated with trash storage and handling. Preventative measures
including enclosures, containment structures, and impervious pavements to mitigate spills, should be used to reduce the likelihood of contamination.
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.)
Design Considerations
Design requirements for waste handling areas are governed by Building and Fire Codes, and by current local agency ordinances and zoning requirements. The design criteria described in this fact sheet are meant to enhance and be consistent with these code and ordinance requirements.
Hazardous waste should be handled in accordance with legal requirements established in Title 22, California Code of Regulation.
Wastes from commercial and industrial sites are typically hauled by either public or commercial carriers that may have design or access requirements for waste storage areas. The design criteria in this fact sheet are recommendations and are not intended to be in conflict with requirements established by the waste hauler. The waste hauler should be contacted prior to the design of your site trash collection areas. Conflicts or issues should be discussed with the local agency.
Designing New Installations
Trash storage areas should be designed to consider the following structural or treatment control BMPs:
■ Design trash container areas so that drainage from adjoining roofs and pavement is diverted around the area(s) to avoid run-on. This might include berming or grading the waste handling area to prevent run-on of stormwater.
■ Make sure trash container areas are screened or walled to prevent off -site transport of trash.
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■ Use lined bins or dumpsters to reduce leaking of liquid waste. • Provide roofs, awnings, or attached lids on all trash containers to minimize direct precipitation and prevent rainfall from entering containers. ■ Pave trash storage areas with an impervious surface to mitigate spills. • Do not locate storm drains in immediate vicinity of the trash storage area. • Post signs on all dumpsters informing users that hazardous materials are not to be disposed of therein.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of " redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should be followed.
Additional Information
Maintenance Considerations
The integrity of structural elements that are subject to damage (i.e., screens, covers, and signs) must be maintained by the owner/operator. Maintenance agreements between the local agency and the owner/operator may be required. Some agencies will require maintenance deed restrictions to be recorded of the property title. If required by the local agency, maintenance agreements or deed restrictions must be executed by the owner/operator before improvement plans are approved.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002.
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Non-Stormwater Discharges
SC -10
Graphic by: Margie Winter
Description
Non-stormwater discharges are those flows that do not consist entirely of stormwater. For municipalities non-stormwater discharges present themselves in two situations. One is from fixed facilities owned and/or operated by the municipality. The other situation is non-stormwater discharges that are discovered during the normal operation of a field program. Some non- stormwater discharges do not include pollutants and may be discharged to the storm drain. These include uncontaminated groundwater and natural springs. There are also some non- stormwater discharges that typically do not contain pollutants and may be discharged to the storm drain with conditions. These include car washing, and surface cleaning. However, there are certain non-stormwater discharges that pose environmental concern. These discharges may originate from illegal dumping or from internal floor drains, appliances, industrial processes, sinks, and toilets that are connected to the nearby storm drainage system. These discharges (which may include: process wastewaters, cooling waters, wash waters, and sanitary
wastewater) can carry substances (such as paint, oil, fuel and other automotive fluids, chemicals and other pollutants) into storm drains. The ultimate goal is to effectively eliminate non- stormwater discharges tothestormwater drainagesystem
through implementation of measures to detect, correct, and enforceagainst illicit connections and illegal discharges.
Approach
The municipality must address non-stormwater discharges from its fixed facilities by assessing the types of non-stormwater discharges and implementing BM Ps for the discharges
determined to pose environmental concern. For field programs Objectives
• Contain
• Educate
• Reduce/Ninirrize
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Derranding
0 0 0 0 0 0 0 0
cnu€ORyFvsrnrmn' TEN
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thefield staff must be trained to now what to look for regarding non-stormwater discharges and the procedures to follow in investigating the detected discharges.
Suggested Protocols
Fixed Facility
General
■ Post "No Dumping" signs with a phone number for reporting dumping and disposal. Signs should also indicatefines and penalties for illegal dumping. ■ Stencil storm drains, where applicable, to prevent illegal disposal of pollutants. Storm drain inlets should have messages such as "Dump No Waste Drains to Stream" stenciled next to them to warn against ignorant or intentional dumping of pollutants into the storm drainage system.
■ Landscaping and beautification efforts of hot spots might also discourage future dumping, as well as provide open space and increase property values. ■ Lighting or barriers may also be needed to discouragefuture dumping.
I llicit Connections
■ Locate discharges from the fixed facility drainage system to the municipal storm drain system through review of "as -built" piping schematics. ■ Use techniques such as smoke testing, dye testing and television camerainspection(asnoted below) to verify physical connections.
■ Isolate problem areas and plug illicit discharge points.
Visual Inspection and Inventory
■ Inventory and inspect each discharge point during dry weather. ■ Keep in mind that drainagefrom a storm event can continue for several days following the end of a storm and groundwater may infiltratethe underground stormwater collection system. Also, non-stormwater discharges are often intermittent and may require periodic inspections.
Review Infield Piping
■ Review the "as -built" piping schematic as a way to determine if there are any connections to the stormwater collection system.
■ Inspect the path of floor drains in older buildings.
Smoke Testi ng
■ Smoke testing of wastewater and stormwater collection systems is used to detect connections between the two systems.
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■ During dry weather the stormwater collection system isfilled with smoke and then traced to sources. The appearance of smoke at the base of a toiletindicatesthattheremaybea connection between the sanitary and the stormwater system.
Dye Testing
■ A dye test can be performed by simply releasing a dye into either your sanitary or process wastewater system and examining the discharge points from the stormwater collection system for discoloration.
TV I nspection of Storm Sewer
■ TV Cameras can be employed to visually identify illicit connections to thefixed facility storm drain system.
Illegal Dumping
■ Regularly inspect and clean up hot spots and other storm drainage areas where illegal dumping and disposal occurs.
■ Clean up spillson paved surfaces with as little water as possible. Usea ragfor small spills, a damp mop for general cleanup, and absorbent material for larger spills. If the spilled material is hazardous, then the used cleanup materials are also hazardous and must be sent to a certified laundry (rags) or disposed of as hazardous waste. ■ Never hose down or bury dry material spills. Sweep up the material and dispose of properly. ■ Use adsorbent materials on small spills rather than hosing down the spill. Removethe adsorbent materials promptly and dispose of properly.
■ For larger spills, a privatespill cleanup company or Hazmat team may be necessary. ■ See fact sheet SC -11 Spill Prevention, Control, and Clean Up.
Field Program
General
■ Develop clear protocols and linesof communication for effectively prohibiting non- stormwater discharges, especially ones that involve more than one jurisdiction and those that are not classified as hazardous, which are often not responded to as effectively as they need to be.
■ Stencil storm drains, where applicable, to prevent illegal disposal of pollutants. Storm drain inlets should have messages such as "Dump No Waste Drains to Stream" stenciled next to them to warn against ignorant or intentional dumping of pollutants into the storm drainage system.
■ See SC -74 Stormwater Drainage System Maintenance for additional information.
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Field Inspection
■ Regularly inspect and clean up hot spots and other storm drainage areas where illegal dumping and disposal occurs.
■ During routinefield program maintenancefield staff should look for evidence of illegal discharges or illicit connection:
I s there evidence of spills such as paints, discoloring, etc.
Are there any odors associated with the drainage system Record locations of apparent illegal discharges/illicit connections and notify appropriate investigating agency.
■ If trained, conduct field investigation of non-stormwater discharges to determine whether they pose a threat to water quality.
Recommended Complaint Investigation Equipment
■ Field Screening Analysis
pH paper or meter
Commercial stormwater pollutant screening kit that can detect for reactive phosphorus, nitrate nitrogen, ammonium nitrogen, specific conductance, and turbidity Sample jars
Sample collection pole
A tool to remove access hole covers
■ Laboratory Analysis
- Sample cooler
- Ice
Samplejarsand labels
Chain of custody forms.
■ Documentation
Camera
Notebook
- Pens
- Notice of Violation forms
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Educational materials
Reporting
■ A database is useful for defining and tracking the magnitude and location of the problem. ■ Report prohibited non-stormwater discharges observed during the course of normal daily activities so they can be investigated, contained and cleaned up or eliminated. ■ Document that non-stormwater discharges have been eliminated by recording tests performed, methods used, dates of testing, and any onsite drainage poi nts observed. ■ Maintain documentation of illicit connection and illegal dumping incidents, including significant conditionally exempt discharges that are not properly managed.
Enforcement
■ Educatethe responsible party if identified on the impacts of their actions, explain the stormwater requirements, and provide information regarding Best Management Practices (BMP), asappropriate. Initiatefollow-up and/or enforcement procedures. ■ If an illegal discharge is traced to a commercial, residential or industrial source, conduct the following activities or coordinatethefollowing activities with the appropriate agency:
- Contact the responsible party to discuss methods of eliminating the non-stormwater discharge, including disposal options, recycling, and possible discharge to the sanitary sewer (if within POTW limits).
- Provide information regarding BM Ps to the responsible party, where appropriate. - Begin enforcement procedures, if appropriate.
- Continue inspection and follow-up activities until the illicit discharge activity has ceased. ■ If an illegal discharge is traced to a commercial or industrial activity, coordinate information on the discharge with the jurisdiction's commercial and industrial facility inspection program.
Training
■ Train technical staff to identify and document illegal dumping incidents. ■ Well -trained employees can reduce human errors that lead to accidental releasesor spills.
The employee should havethe tools and knowledge to immediately begin cleaning up a spill if one should occur. Employees should befamiliar with the Spill Prevention Control and Countermeasure Plan.
■ Train employees to identify non-stormwater discharges and report them to the appropriate departments.
■ Train staff who have the authority to conduct surveillance and inspections, and write citationsfor those caught illegally dumping.
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■ Train municipal staff responsible for surveillance and inspection in the following:
- OSHA -required Health and Safety Training (29 CFR 1910.120) plus annual refresher training (as needed).
- OSHA Confined Space Entry training (Cal -OSHA Confined Space, Title 8 and federal OSHA 29 CFR 1910.146).
- Procedural training (field screening, sampling, smoke/ dye testing, TV inspection). ■ Educate the identified responsible party on the impacts of his or her actions.
Spill Response and Prevention
■ SeeSC-11 Spill Prevention Control and Clean Up
Other Considerations
■ The elimination of illegal dumping is dependent on the availability, convenience, and cost of alternative means of disposal. The cost of fees for dumping at a proper waste disposal facility are often more than the fine for an illegal dumping offense, thereby discouraging people from complying with the law. The absence of routi ne or affordable pickup service for trash and recyclables in some communities also encourages illegal dumping. A lack of understanding regarding applicable laws or the inadequacy of existing laws may also contri bute to the problem.
■ Municipal codes should include sections prohibiting the discharge of soil, debris, refuse, hazardous wastes, and other pollutants into the storm drain system. ■ Many facilities do not have accurate, up-to-date schematic drawings. ■ Can be difficult to locate illicit connections especially if there is groundwater infiltration.
Requirements
Costs
■ Eliminating illicit connections can be expensive especially if structural modifications are required such re -plumbing cross connections under an existing slab. ■ Minor cost to train field crews regarding the identification of non-stormwater discharges.
The primary cost isfor a fully integrated program to identify and eliminate illicit connections and illegal dumping. However, by combining with other municipal programs(i.e. pretreatment program) cost may be lowered.
■ Municipal cost for containment and disposal may be borne by the discharger.
Maintenance
Not applicable
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Supplemental Information
Further Detail of the BM P
What constitutes a "non-stormwater" discharge?
■ Non-stormwater discharges are discharges not made up entirely of stormwater and include water used directly in the manufacturing process (process wastewater), air conditioning condensate and coolant, non -contact cooling water, cooling equipment condensate, outdoor secondary containment water, vehicle and equipment wash water, landscape irrigation, sink and drinking fountain wastewater, sanitary wastes, or other wastewaters.
Permit Requirements
■ Current municipal NPDES permits require municipalities to effectively prohibit non- stormwater discharges unless authorized by a separate NPDES permit or allowed in accordance with the current NPDES permit conditions. Typically the current permits allow certain non-stormwater discharges in the storm drain system as long as the discharges are not significant sources of pollutants. In this context thefollowing non-stormwater discharges are typically allowed:
Diverted stream flows;
Rising found waters;
Uncontaminated ground water infiltration (as defined at 40 CFR 35.2005(20)); Uncontaminated pumped ground water;
Foundation drains;
Springs;
Water from crawl space pumps;
Footing drains;
Air conditioning condensation;
Flowsfrom riparian habitats and wetlands;
Water line and hydrant flushing ;
Landscape irrigation;
Planned and unplanned discharges from potable water sources; Irrigation water;
Individual residential car washing; and
- Lawn watering.
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Municipal facilities subject to industrial general permit requirements must include a certification that the stormwater collection system has been tested or evaluated for the presence of non-stormwater discharges. The state's General Industrial Stormwater Permit requires that non-stormwater discharges be eliminated prior to implementation of thefacility's SWPPP.
Illegal Dumping
■ Establish a system for tracking incidents. The system should be designed to identify the following:
Illegal dumping hot spots
Types and quantities (in some cases) of wastes
Patterns in time of occurrence (time of day/night, month, or year) Mode of dumping (abandoned containers, "midnight dumping" from moving vehicles, direct dumping of materials, accidents/spills)
Responsible parties
Outreach
One of the keys to success of reducing or eliminating illegal dumping is increasing the number of people on the street who are aware of the problem and who have the tools to at least identify the incident, if not correct it. Therewea number of ways of accomplishing this:
■ Train municipal staff from all departments(publicworks, utilities, street cleaning, parks and recreation, industrial waste inspection, hazardous waste inspection, sewer maintenance) to recognize and report the incidents.
■ Deputize municipal staff who may come into contact with illegal dumping with the authority to write illegal dumping tickets for offenders caught in the act (see below). ■ Educate the public. As many as 3 out of 4 people do not understand that in most communities the storm drain does not go to the wastewater treatment plant. Unfortunately, with the heavy emphasis in recent years on public education about solid waste management, including recycling and household hazardous waste, the sewer system (both storm and sanitary) has been the likely recipient of cross -media transfers of waste. ■ Provide the public with a mechanism for reporting incidents such as hotline and/or door hanger (see below).
■ Help areas where incidents occur more frequently set up environmental watch programs (like crime watch programs).
■ Train volunteers to notice and report the presence and suspected source of an observed pollutant to the appropriate public agency.
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What constitutes a "non-stormwater" discharge?
■ Non-stormwater discharges are discharges not made up entirely of stormwater and include water used directly in the manufacturing process(processwastewater), air conditioning condensate and coolant, non -contact cooling water, cooling equipment condensate, outdoor secondary containment water, vehicle and equipment wash water, landscape irrigation, sink and drinking fountain wastewater, sanitary wastes, or other wastewaters.
Permit Requirements
■ Current municipal NPDES permits require municipalities to effectively prohibit non- stormwater discharges unless authorized by a separate NPDES permit or allowed in accordance with the current NPDES permit conditions. Typically the current permits allow certain non-stormwater discharges in the storm drain system as long as the discharges are not significant sources of pollutants. In this context thefollowing non-stormwater discharges are typically allowed:
Diverted stream flows;
Rising found waters;
Uncontaminated ground water infiltration (as defined at 40 CFR 35.2005(20)); Uncontaminated pumped ground water;
Foundation drains;
Springs;
Water from crawl space pumps;
Footing drains;
Air conditioning condensation;
Flowsfrom riparian habitats and wetlands;
Water line and hydrant flushing ;
Landscape irrigation;
Planned and unplanned discharges from potable water sources; Irrigation water;
Individual residential car washing; and
- Lawn watering.
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of non-stormwater discharges. The state's General Industrial Stormwater Permit requires that non-stormwater discharges be eli mi nated prior to implementation of thefacility's SWPPP.
Storm Drain Stenciling
■ Stencil storm drain inletswith a messageto prohibit illegal dumpings, especially in areas with waste handling facilities.
■ Encourage public reporting of improper waste disposal by a HOTLINE number stenciled onto the storm drain inlet.
■ See Supplemental Information section of this fact sheet for further detail on stenciling program approach.
Oil Recycling
■ Contract collection and hauling of used oil to a private licensed used oil hauler/ recycler. ■ Comply with all applicable state and federal regulations regarding storage, handling, and transport of petroleum products.
■ Create procedures for collection such as; collection locations and schedule, acceptable containers, and maximum amounts accepted.
■ The California Integrated Waste Management Board hasa Recycling Hotline, (800) 553- 2962, that provides information and recycling locations for used oil.
Household Hazardous Waste
■ Provide household hazardous waste (HHW) collection facilities. Several types of collection approaches are available including permanent, periodic, or mobile centers, curbside collection, or a combination of these systems.
Training
■ Train municipal employees and contractors in proper and consistent methods for waste disposal.
■ Train municipal employees to recognize and report illegal dumping. ■ Train employees and subcontractors in proper hazardous waste management.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly dispose of spill cleanup material.
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Other Considerations
■ Federal Regulations (RCRA, SARA, CERCLA) and state regulations exist regarding the disposal of hazardous waste.
■ Municipalities are required to have a used oil recycling element andaHHWelementwithin their integrated waste management plan.
■ Significant liability issues are involved with the collection, handling, and disposal of HHW.
Examples
The City of Palo Alto has developed a public participation program for reporting dumping violations. When a concerned citizen or public employee encounters evidence of illegal dumping, a door hanger (similar in format to hotel "Do Not Disturb" signs) is placed on the front doors in the neighborhood. The door hanger notes that a violation has occurred in the neighborhood, informs the reader why illegal dumping isa problem, and notes that illegal dumping carries a significant financial penalty. Information is also provided on what citizens can do as well as contact numbers for more information or to report a violation.
The Port of Long Beach has a state of the art database incorporating storm drain infrastructure, potential pollutant sources, facility management practices, and a pollutant tracking system.
The State Department of Fish and Game has a hotline for reporting violations called CaITIP(1- 800-952-5400). The phone number may be used to report any violation of a Fish and Game code (illegal dumping, poaching, etc.).
The California Department of Toxic Substances Control's Waste Alert Hotline, 1-800-69TOX1 C, can be used to report hazardous waste violations.
References and Resources
http://www.stormwatercenter.net/
California's Nonpoint Source Program Plan http://www.co.clark.wa.us/pubworks/bmpman.pdf King County Stormwater Pollution Control Manual - http://dnr.metrokc.gov/wlr/dss/spcm.htm Orange County Stormwater Program,
http://www.ocwatersheds.com/stormwater/swp_introduction.asp San Diego Stormwater Co-permitteesJurisdictional Urban Runoff Management Program ( http://www.projectcleanwater.org)
Santa Clara Valley Urban Runoff Pollution Prevention Program http://www.scvurppp-w2k.com/pdf%20documents/ PS I CI D.PDF January 2003
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Spill Prevention, Control & Cleanup SC -11
Description
Spills and leaks, if not properly controlled, can adversely impact the storm drain system and receiving waters. Due to the type of work or the materials involved, many activitiesthat occur either at a municipal facility or asa part of municipal field programs have the potential for accidental spills and leaks. Proper spill response planning and preparation can enable municipal
employees to effectively respond to problems when they occur and minimize the discharge of pollutants to the environment.
Approach
• An effective spill response and control plan should include:
- Spill/ leak prevention measures;
- Spill response procedures;
- Spill cleanup procedures;
- Reporting; and
- Training
• Awell thought out and implemented plan can prevent
pollutants from entering the storm drainagesystem and can be used as tool for training personnel to prevent and
control future spills as well.
Pollution Prevention
• Develop and implement a Spill Prevention Control and
Response Plan. The plan should include:
Objectives
• Cover
• Contain
• Educate
• ReducenVininize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Eerrending
CALIFOR\'I 1 tiro P\I' TET,
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SC -11 Spill Prevention, Control & Cleanup
A description of the facility, the address, activities and materials involved Identification of key spill response personnel
Identification of the potential spill areas or operations prone to spills/ leaks Identification of which areas should be or are bermed to contain spills/ leaks Facility map identifying the key locations of areas, activities, materials, structural BM Ps, etc.
Material handling procedures
Spill response procedures including:
Assessment of the site and potential impacts
Containment of the material
Notification of the proper personnel and evacuation procedures Clean up of the site
Disposal of the waste material and
Proper record keeping
■ Product substitution — use less toxicmaterials(i.e. use water based paints instead of oil based paints)
■ Recycle, reclaim, or reuse materials whenever possible. This will reduce the amount of materials that are brought intothefacilityor intothefield.
Suggested Protocols
Spill/ Leak Prevention Measures
■ If possible, move material handling indoors, under cover, or away from storm drains or sensitive water bodies.
■ Properly label all containers so that the contents are easily identifiable. ■ Berm storage areas so that if a spill or leak occurs, the material is contained. ■ Cover outside storage areas either with a permanent structure or with a seasonal one such as a tarp so that rain can not come into contact with the materials. ■ Check containers (and any containment sumps) often for leaks and spills. Replace contai ners that are leaking, corroded, or otherwise deteri orati ng with containers in good condition. Collect all spilled liquids and properly dispose of them. 2 of 6 California Stormwater BMP Handbook
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■ Store, contain and transfer liquid materials in such a manner that if the container is ruptured or the contents spilled, they will not discharge, flow or be washed into the storm drainage system, surface waters, or groundwater.
■ Place drip pans or absorbent materials beneath all mounted taps and at all potential drip and spill locations during thefilling and unloading of containers. Any collected liquids or soiled absorbent materials should be reused/ recycled or properly disposed of. ■ For field programs, only transport the minimum amount of material needed for the daily activities and transfer materials between containers at a municipal yard where leaks and spill are easier to control.
■ If paved, sweep and clean storage areas monthly, do not use water to hose down the area unless all of the water will be collected and disposed of properly. ■ Install a spill control device (such as a tee section) in any catch basins that collect runoff from any storage areas if the materials stored are of I, gas, or other materials that separate from and float on water. This will allow for easier cleanup if a spill occurs. ■ If necessary, protect catch basins while conducting field activities so that if aspill occurs, the material will be contained.
Training
■ Educate employees about spill prevention, spill response and cleanup on a routine basis. ■ Well -trained employees can reduce human errors that lead to accidental releases or spills:
- The employees should have the tools and knowledgeto immediately begin cleaning up a spill if one should occur.
- Employees should befamiliar with the Spill Prevention Control and Countermeasure Plan if one is available.
■ Training of staff from all municipal departments should focus on recognizing and reporting potential or current spills/ leaks and who they should contact. ■ Employees responsi ble for aboveground storage tanks and liquid transfers for large bulk containers should be thoroughly familiar with the Spill Prevention Control and Countermeasure Plan and the plan should be readily available.
Spill Response and Prevention
■ Identify key spill response personnel and train employees on who they are. ■ Store and maintain appropriate spill cleanup materials in a clearly marked location near storage areas; and train employees to ensure familiarity with the site's spill control plan and/or proper spill cleanup procedures.
■ Locate spill cleanup materials, such as absorbents, where they will be readily accessible (e.g. near storage and maintenance areas, on field trucks).
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■ Follow the Spill Prevention Control and Countermeasure Plan if one is available. ■ If a spill occurs, notify the key spill response personnel immediately. If the material is unknown or hazardous, the local fire department may also need to be contacted. ■ If safe to do so, attempt to contain the material and block the nearby storm drains so that the area impacted is minimized. If the material is unknown or hazardous wait for properly trained personnel to contain the materials.
■ Perform an assessment of the area where the spi II occurred and the downstream area that it could impact. Relay this information to the key spill response and clean up personnel.
Spill Cleanup Procedures
■ Small non-hazardousspills
Usea rag, damp cloth or absorbent materials for general clean up of liquids Use brooms or shovels for the general clean up of dry materials If water is used, it must be collected and properly disposed of. The wash water can not be allowed to enter the storm drain.
Dispose of any waste materials properly
Clean or dispose of any equipment used to clean up the spill properly ■ Large non -hazardous spills
Use absorbent materials for general clean up of liquids Use brooms, shovels or street sweepers for the general clean up of dry materials If water is used, it must be collected and properly disposed of. The wash water can not be allowed to enter the storm drain.
Dispose of any waste materials properly
Clean or dispose of any equipment used to clean up the spill properly ■ For hazardous or very large spills, a private cleanup company or H azmat team may need to be contacted to assess the situation and conduct the cleanup and disposal of the materials. ■ Chemical cleanups of material can be achieved with the use of absorbents, gels, and foams.
Remove the adsorbent materials promptly and dispose of according to regulations. ■ If the spilled material is hazardous, then the used cleanup materials are also hazardous and must be sent to a certified laundry (rags) or disposed of as hazardous waste.
Reporting
■ Report any spills immediately to the identified key municipal spill response personnel. 4 of 6 California Stormwater BMP Handbook
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■ Report spills in accordance with applicable reporting laws. Spills that pose an immediate threat to human health or the environment must be reported immediately to the Office of Emergency Service (OES)
■ Spills that pose an immediate threat to human health or the environment may also need to be reported within 24 hours to the Regional Water Quality Control Board. ■ Federal regulations require that any oil spill into a water body or onto an adjoining shoreline be reported to the National Response Center (N RC) at 800-424-8802 (24 hour) ■ After the spill has been contained and cleaned up, a detailed report about the incident should be generated and kept on file(seethesection on Reporting below). The incident may also be used in briefing staff about proper procedures
Other Considerations
■ State regulations exist for facilitieswith a storage capacity of 10,000 gallons or more of petroleum to prepare a Spill Prevention Control and Countermeasure Plan (SPCC) Plan (Health & Safety Code Chapter 6.67).
■ State regulations also exist for storage of hazardous materials (Health & Safety Code Chapter
6.95), including the preparation of area and business plans for emergency response to the r el eases or threatened releases.
■ Consider requiring smaller secondary containment areas (less than 200 sq. ft.) to be connected to the sanitary sewer, if permitted to do so, prohibiting any hard connections to the storm drain.
Requirements
Costs
■ Will vary depending on the sizeofthefacilityandthenecessarycontrols. ■ Prevention of leaks and spills is inexpensive. Treatment and/or disposal of wastes, contaminated soil and water is very expensive
Maintenance
■ This BM P has no major administrative or staffing requirements. However, extra time is needed to properly handle and dispose of spills, which results in increased labor costs Supplemental I nformation
Further Detail of the BMP
Reporting
Record keeping and internal reporting represent good operating practices because they can increase the efficiency of the response and containment of a spill. A good record keeping system helps the municipality minimize incident recurrence, correctly respond with appropriate containment and cleanup activities, and comply with legal requirements.
A record keeping and reporting system should beset up for documenting spills, leaks, and other discharges, including discharges of hazardous substances in reportable quantities. Incident records descri be the quality and quantity of non-stormwater discharges to the storm drain.
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These records should contain thefollowing information:
■ Date and time of the incident
■ Weather conditions
■ Duration of the spill/leak/discharge
■ Cause of the spill/ leak/discharge
■ Response procedures implemented
■ Persons notified
■ Environmental problems associated with the spill/leak/discharge Separate record keeping systems should be established to document housekeeping and preventive maintenance inspections, and training activities. All housekeeping and preventive maintenance inspections should be documented. Inspection documentation should contain the following information:
■ The date and ti me the inspection was performed
■ Name of the inspector
■ Items inspected
■ Problems noted
■ Corrective action required
■ Date corrective action was taken
Other means to document and record inspection resultsarefield notes, timed and dated photographs, videotapes, and drawings and maps.
Examples
The City of Palo Alto includes spill prevention and control as a major element of its highly effective program for municipal vehicle maintenance shops.
References and Resources
King County Stormwater Pollution Control Manual - http://dnr.metrokc.gov/wlr/dss/spcm.htm Orange County Stormwater Program
http://www.ocwatersheds.com/sormwater/swp introduction.asp San Diego Stormwater Co-permitteesJurisdictional Urban Runoff Management Program (URMP)
http://www.projectcleanwater.org/pdf/ M odel%20Program%20M unicipal%20Facilities.pdf 6 of 6 California Stormwater BMP Handbook
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Outdoor Loading/ Unloading
SC -30
Description
The loading/ unloading of materials usually takes place outside on docks or terminals; therefore, materials spi lied, leaked, or lost during loading/unloading may collect in the soil or on other surfaces and have the potential to be carried away by stormwater runoff or when the area is cleaned. Additionally, rainfall may wash pollutants from machinery used to unload or move
materials. Loading and unloading of material may include package products, barrels, and bulk products. Implementation of the following protocols will prevent or reduce the discharge of pollutants to stormwater from outdoor loading/unloading of materials.
Approach
Pollution Prevention
• Keep accurate maintenance logs to evaluate materials
removed and improvements made.
• Park tank trucks or delivery vehicles in designated areas so that spillsor leaks can becontained.
• Limit exposure of materials with the potential to contaminate stormwater.
• Prevent stormwater runon.
• Regularly check equipment for leaks.
Objectives
• Cover
• Contain
• Educate
• ReducenVinirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
CA LI€OR \-1 -A 4n iMK 9 TEN
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Suggested Protocols
Loading and Unloading — General Guidelines
■ Develop an operations plan that describes procedures for loading and/or unloading. ■ Do not conduct loading and unloading during wet weather, whenever possible. ■ Cover designated loading/ unloading areas to reduce exposure of materialsto rain. ■ Aseal or door skirt between delivery vehicles and building can reduce or prevent exposure to rain.
■ Design loading/unloading area to prevent stormwater runon which would include grading or berming the area, and positioning roof downspouts so they direct stormwater away from the loading/ unloading areas.
■ If feasible, load and unload all materials and equipment in covered areas such as building overhangs at loading docks.
■ Load/ unload only at designated loading areas.
■ Use drip pans underneath hose and pipe connections and other leak -prone spots during liquid transfer operations, and when making and breaking connections. Several drip pans should be stored in a covered location near the liquid transfer area so that they are always available, yet protected from precipitation when not in use. Drip pans can be made specifically for railroad tracks. Drip pans must be cleaned periodically, and drip collected materials must be disposed of properly.
■ Pave loading areas with concrete instead of asphalt.
■ Avoid placing storm drains in the area.
■ Grade and/or berm he loading/ unloading area to a drain that is connected toadead-end sump.
Inspection
■ Check loading and unloading equipment regularly for leaks, including valves, pumps, flanges and connections.
■ Look for dust or fumes during loading or unloading operations.
Training
■ Train employees(e.g. fork lift operators) and contractors on proper spill containment and cleanup.
■ Employees trained in spill containment and cleanup should be present during the loading/ unloading.
■ Train employees in proper handling techniques during liquid transfers to avoid spills. 2 of 4 California Stormwater BMP Handbook
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■ Make sure forklift operators are properly trained on loading and unloading procedures.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup
■ Keep your spill prevention Control and countermeasure (SPCC) Plan up-to-date, and implement accordingly.
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ Space, material characteristics and/ or time limitations may preclude all transfersfrom being performed indoors or under cover.
Requirements
Costs
■ Should be low except when covering a large loading/ unloading area.
Maintenance
■ Conduct regular inspections and make repairs as necessary. The frequency of repairs wi II depend on the age of the faci l ity.
■ Check loading and unloading equipment regularly for leaks. ■ Regular broom dry -sweeping of area.
■ Conduct major clean -out of loading and unloading area and sump prior to October 1 of each year.
Supplemental I nformation
Further Detail of the BMP
Special Circumstances for Indoor Loading/Unloading of Materials As appropriate loading or unloading of liquids should occur indoors so that any spills that are not completely retained can be discharged to the sanitary sewer, treatment plant, or treated in a manner consistent with local sewer authorities and permit requirements. ■ For loading and unloading tank trucks to above and below ground storage tanks, the following procedures should be used:
- The area where the transfer takes place should be paved. If the liquid is reactive with the asphalt, Portland cement should be used to pave the area. - Transfer area should be designed to prevent runon of stormwater from adjacent areas.
Sloping the pad and using a curb, like a speed bump, around the uphill side of the transfer area should reduce run-on.
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Transfer area should be designed to prevent runoff of spilled liquidsfrom the area.
Sloping the area to a drain should prevent runoff. The drain should be connected to a dead-end sump or to the sanitary sewer (if allowed). A positive control valve should be installed on the drain.
■ For transfer from rail cars to storage tanks that must occur outside, use the fol lowi ng procedures:
Drip pans should be placed at locations where spi I lage may occur, such as hose connections, hose reels, and filler nozzles, Use drip pans when making and breaking connections.
- Drip pan systems should be installed between the rails to collect spillage from tank cars.
References and Resources
http://www.stormwatercenter.net/
King County- ftp://dnr.metrokc.gov/wlr/dss/spcm/Chapter%203.PDF Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp San Diego Stormwater Co-permitteesJurisdictional Urban Runoff Management Program (U RM P) -
http://www.projectcleanwater.org/pdf/ Model%20Program%20M unicipal%20Facil ities.pdf 4 of 4 California Stormwater BMP Handbook
Municipal
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January 2003
11-774
Waste Handling & Disposal SC -34
Description
Improper storage and handling of solid wastes can allow toxic compounds, oils and greases, heavy metals, nutrients, suspended solids, and other pollutants to enter stormwater runoff. The discharge of pollutants to stormwater from waste handling and disposal can be prevented and reduced by tracking waste generation, storage, and disposal; reducing waste generati on and disposal through source reduction, re -use, and recycling; and preventing runon and runoff.
Approach
Pollution Prevention
• Reduction in the amount of waste generated can be
accomplished using the following source controls such as:
- Production planning and sequencing
- Processor equipment modification
- Raw material substitution or elimination
- Loss prevention and housekeeping
- Waste segregation and separation
- Close loop recycling
• Establish a material tracking system to increase awareness about material usage. This may reduce spills and minimize contamination, thus reducing the amount of waste produced. • Recycle materials whenever possible.
Objectives
• Cover
• Contain
• Educate
• ReducenVinirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Derrending
0 0 0 0 0 0 0 0
CALI€ORVI-A STCBMW VT EN
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SC -34 Waste Handling & Disposal
Suggested Protocols
General
■ Cover storage containers with leak proof lids or some other means. If waste isnot in containers, cover all wastepiles(plastictarpsareacceptablecoverage) and prevent stormwater runon and runoff with a berm. The waste containers or piles must be covered except when in use.
■ Use drip pans or absorbent materials whenever grease containers are emptied by vacuum trucks or other means. Grease cannot be left on the ground. Collected grease must be properly disposed of as garbage.
■ Check storage contai ners weekly for leaks and to ensure that lids are on tightly. Replace any that are leaking, corroded, or otherwise deteriorating. ■ Sweep and clean the storage area regularly. If it is paved, do not hose down the areatoa storm drain.
■ Dispose of rinse and wash water from cleaning waste containers into a sanitary sewer if allowed by the local sewer authority. Do not discharge wash water to the street or storm drain.
■ Transfer waste from damaged containers into safe containers. ■ Take special care when loading or unloading wastes to minimize losses. Loading systems can be used to minimize spills and fugitive emission losses such as dust or mist. Vacuum transfer systems can minimize waste loss.
Controlling Litter
■ Post "No Littering" signs and enforce anti -litter laws. ■ Provide sufficient number of litter receptacles for the facility. ■ Clean out and cover litter receptacles frequently to prevent spillage.
Waste Collection
■ Keep waste collection areas clean.
■ Inspect solid waste containers for structural damage or leaks regularly. Repair or replace damaged containers as necessary.
■ Secure solid waste containers; containers must be closed tightly when not in use. ■ Place waste containers under cover if possible.
■ Do not fill waste containers with washout water or any other liquid. ■ Ensure that only appropriate solid wastes are added to the solid waste container. Certain wastes such as hazardous wastes, appliances, fluorescent lamps, pesticides, etc. may not be 2 of 5 California Stormwater BMP Handbook
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disposed of in solid waste containers (see chemical/ hazardous waste collection section below).
■ Do not mix wastes; this can cause chemical reactions, make recycling impossible, and complicate disposal.
Good Housekeeping
■ Use all of the product before disposing of the container. ■ Keep the waste management area clean at all times by sweeping and cleaning up spills immediately.
■ Use dry methods when possible (e.g. sweeping, use of absorbents) when cleaning around restaurant/food handling dumpster areas. If water must be used after sweeping/ using absorbents, collect water and discharge through grease interceptor to the sewer. ■ Stencil storm drains on thefacility's property with prohibitive message regarding waste disposal.
Chemical/ Hazardous Wastes
■ Select designated hazardous waste collection areas on -site. ■ Store hazardous materials and wastes in covered containers protected from vandalism, and in compliance with fire and hazardous waste codes.
■ Place hazardous waste containers in secondary containment. ■ Make sure that hazardous waste is collected, removed, and disposed of only at authorized disposal areas.
Runon/ Runoff Prevention
■ Prevent stormwater runon from entering the waste management area by enclosing the area or building a berm around the area.
■ Prevent the waste materials from directly contacting rain. ■ Cover waste piles with temporary covering material such as reinforced tarpaulin, polyethylene, polyurethane, polypropyleneor hypalon.
■ Cover the area with a permanent roof if feasible.
■ Cover dum psters to prevent rain from washing waste out of holes or cracks in the bottom of thedumpster.
■ Move the activity indoor after ensuring all safety concerns such as fire hazard and ventilation are addressed.
I nspection
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■ Inspect and replacefaultypumpsor hoses regularly to minimizethe potential of releases and spills.
■ Check waste management areas for leaking containers or spills. ■ Repair leaking equipment including valves, lines, seals, or pumps promptly.
Training
■ Train staff pollution prevention measures and proper disposal methods. ■ Train employees and contractors proper spill containment and cleanup. The employee should have the tools and knowledge to immediately begin cleaning up a spill if one should occur.
■ Train employees and subcontractors in proper hazardous waste management.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Keep your Spill Prevention Control and countermeasure(SPCC) plan up-to-date, and implement accordingly.
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly dispose of spill cleanup material.
■ Vehiclestransporting waste should have spill prevention equipment that can prevent spills during transport. The spill prevention equipment includes:
- Vehicles equi pped with baffles for liquid waste
- Trucks with sealed gates and spill guards for solid waste Other Considerations
■ Hazardous waste cannot be re -used or recycled; it must be disposed of by a licensed hazardous waste hauler.
Requirements
Costs
■ Capital and operation and maintenancecosts will vary substantially depending on the size of the faci l ity and the types of waste handled. Costs should below if there is an inventory program in place.
Maintenance
■ None except for maintaining equipment for material tracking program. 4 of 5 California Stormwater BMP Handbook
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Supplemental I nformation
Further Detail of the BMP
Land Treatment System
■ Minimizethe runoff of polluted sormwater from land application of municipal waste on -site by:
- Choosing a site where slopes are under 6%, the soil is permeable, there is a low water table, it is located away from wetlands or marshes, there is a closed drainage system. - Avoiding application of waste to the site when it is raining or when the ground is saturated with water.
- Growing vegetation on land disposal areas to stabilize soils and reduce the volume of surface water runoff from the site.
- Maintaining adequate barriers between the land application site and the receiving waters. Planted strips are particularly good.
- Using erosion control techniques such as mulching and matting, filter fences, straw bales, diversion terracing, and sediment basins.
- Performing routine maintenance to ensure the erosion control or sitestabilization measures are working.
References and Resources
King County Stormwater Pollution Control Manual - http://dnr.metrokc.gov/wlr/dss/spcm.htm Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp introduction.asp Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies Associations (BASMAA). On-line: http://www.basmaa.org
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Building & Grounds Maintenance SC -41
Description
Stormwater runoff from building and grounds maintenance activities can be contaminated with toxic hydrocarbons in solvents, fertilizers and pesticides, suspended solids, heavy metals, and abnormal pH. Utilizing thefollowing protocols will prevent or reduce the discharge of pollutants to stormwater from building and grounds maintenance activities by washing and cleaning up with as little water as possible, following good landscape management practices, preventing and cleaning up spills immediately, keeping debrisfrom entering the storm drains, and maintaining the stormwater collection system.
Approach
Pollution Prevention
• Switch to non-toxic chemicals for maintenance when
possible.
• Choose cleaning agents that can be recycled.
• Encourage proper lawn management and landscaping,
including use of native vegetation.
• Encourage use of Integrated Pest Management techniques for pest control.
• Encourage proper onsite recycling of yard trimmings.
• Recycle residual paints, solvents, lumber, and other material as much as possible.
Objectives
• Cover
• Contain
• Educate
• ReducenVinirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Derrending
0 0 0 0 0 0 0 0
CALI€ORSi 1 �(I AIY 1CF:G'
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SC -41 Building & Grounds Maintenance
Suggested Protocols
PressureWashing of Buildings, Rooftops, and Other Large Objects ■ In situations where soaps or detergents are used and the surrounding area is paved, pressure washers must use a wastewater collection device that enables collection of wash water and associated solids. A sump pump, wet vacuum or similarly effective device must be used to collect the runoff and loose materials. The collected runoff and solids must be disposed of properly.
■ If soaps or detergents are not used, and the surrounding area is paved, wash water runoff does not have to be collected but must be screened. Pressure washers must use filter fabric or some other type of screen on the ground and/or in he catch basin to trap theparticlesin wash water runoff.
■ If you are pressure washi ng on a grassed area (with or without soap), runoff must be dispersed as sheet flow as much as possible, rather than as a concentrated stream. The wash runoff must remain on the grass and not drain to pavement. Ensurethat this practice does not kill grass.
Landscaping Activities
■ Do not apply any chemicals (insecticide, herbicide, or fertilizer) directly to surface waters, unless the application is approved and permitted by the state. ■ Dispose of grass clippings, leaves, sticks, or other collected vegetation as garbage, or by composting. Do not dispose of collected vegetation into waterways or storm drainage systems.
■ Use mulch or other erosion control measures on exposed soils. ■ Check irrigation schedules so pesticides will not be washed away and to minimize non- stormwater discharge.
Building Repair, Remodeling, and Construction
■ Do not dump any toxic substance or liquid waste on the pavement, the ground, or toward a storm drain.
■ Use ground or drop cloths underneath outdoor painting, scraping, and sandblasting work, and properly dispose of collected material daily.
■ Use ground cloth or oversized tub for activities such as paint mixing and tool cleaning. ■ Clean paint brushes and tools covered with water -based paints in sinks connected to sanitary sewers or in portablecontainersthat can be dumped into a sanitary sewer drain.
Brushes and tools covered with non -water -based paints, finishes, or other materials must be cleaned in a manner that enables collection of used solvents (e.g., paint thinner, turpentine, etc.) for recycling or proper disposal.
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■ Usea storm drain cover, filter fabric, or similarly effective runoff control mechanism if dust, grit, wash water, or other pollutants may escape the work area and enter a catch basin. The containment device(s) must be in place at the beginning of thework day, and accumulated dirty runoff and solids must be collected and disposed of before removing the containment device(s) at the end of the work day.
■ If you need to de -water an excavation site, you may need to filter the water before discharging to a catch basin or off -site. In which case you should direct the water through hay bales and filter fabric or use other sediment filters or traps. ■ Store toxic material under cover with secondary containment during precipitation events and when not in use. A cover would include tarps or other temporary cover material.
Mowing, Trimming, and Planting
■ Dispose of leaves, sticks, or other collected vegetation as garbage, by composting or at a permitted landfill. Do not dispose of collected vegetation into waterways or storm drainage systems.
■ Use mulch or other erosion control measures when soils are exposed. ■ Place temporarily stockpiled material away from watercourses and drain inlets, and berm or cover stockpiles to prevent material releases to the storm drain system. ■ Consider an alternative approach when bailing out muddy water; do not put it in the storm drain, pour over landscaped areas.
■ Use hand or mechanical weeding where practical.
Fertilizer and Pesticide Management
■ Follow all federal, state, and local laws and regulations governing the use, storage, and disposal of fertilizers and pesticides and training of applicators and pest control advisors. ■ Follow manufacturers' recommendations and label directions. Pesticides must never be applied if precipitation isoccuring or predicted. Do not apply insecticideswithin 100 feet of surface waters such as lakes, ponds, wetlands, and streams. ■ Useless toxic pesticides that will do thejob, whenever possible. Avoid use of copper -based pesticides if possible.
■ Do not use pesticides if rain is expected.
■ Do not mix or prepare pesticides for application near storm drains. ■ Usethe minimum amount needed for thejob.
■ Cal ibratefertilizer distributorsto avoid excessive application. ■ Employtechniquesto minimize off -target application (e.g. spray drift) of pesticides, including consideration of alternative application techniques.
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■ Apply pesticides only when wind speeds are low.
■ Work fertilizers into the soil rather than dumping or broadcasting them onto the surface. ■ I rrigate slowly to prevent runoff and then only as much as is needed. ■ Clean pavement and sidewalk if fertilizer isspilled on these surfaces before applying irrigation water.
■ Dispose of empty pesticide containers according to the instructions on the container label. ■ Use up the pesticides. Rinse containers, and use rinse water as product. Dispose of unused pesticide as hazardous waste.
■ Implement storage requirements for pesticide products with guidance from the local fire department and County Agricultural Commissioner. Provide secondary containment for pesticides.
Inspection
■ Inspect irrigation system periodically to ensure that the right amount of water is being applied and that excessive runoff is not occurring. Minimize excess watering, and repair leaks in the irrigation system as soon as they are observed.
Training
■ Educate and train employees on use of pesticides and in pesticide application techniques to prevent pollution.
■ Train employees and contractors in proper techniques for spill containment and cleanup. ■ Be sure the frequency of training takes into account the complexity of the operations and the nature of the staff.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup
■ Keep your Spill Prevention Control and countermeasure(SPCC) plan up-to-date, and implement accordingly.
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ Alternative pest/ weed controls may not be available, suitable, or effective in many cases. 4 of 5 California Stormwater BMP Handbook
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Requirements
Costs
■ Overall costs should below in comparison to other BM Ps.
Maintenance
■ Sweep paved areas regularly to collect loose particles, and wipe up spills with rags and other absorbent material immediately, do not hose down the area to a storm drain.
Supplemental I nformation
Further Detail of the BMP
FireSprinkler Line Flushing
Building fire sprinkler lineflushing may be a source of non-stormwater runoff pollution. The water entering the system is usually potable water though in some areas it may be non -potable reclaimed wastewater. There are subsequent factors that may drastically reduce the quality of the water in such systems. Black iron pipe is usually used since it is cheaper than potable piping but it is subject to rusting and results in lower quality water. Initially the black iron pipe has an oil coating to protect it from rusting between manufacture and installation; this will contaminate the water from thefirst flush but not from subsequent flushes. Nitrates, poly- phosphates and other corrosion inhibitors, as well as fi re suppressants and antifreeze may be added to the sprinkler water system. Water generally remains in the sprinkler system a long time, typically a year, between flushes and may accumulate iron, manganese, lead, copper, nickel and zinc. The water generally becomes anoxic and contains living and dead bacteria and breakdown products from chlorination. This may result in a significant BOD problem and the water often smells. Consequently disposefire sprinkler line flush water into the sanitary sewer.
Do not allow discharge to storm drain or infiltration dueto potential high levels of pollutants in fire sprinkler line water.
References and Resources
California's Nonpoint Source Program Plan http://www.swrcb.ca.gov/nps/index.html King County - ftp://dnr.metrokc.gov/wlr/dss/spcm/Chapter%203.PDF Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp Mobile Cleaners Pilot Program: Final Report. 1997. Bay Area Stormwater Management Agencies Association (BASSM A) http://www.basmaa.org/
Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies Association (BASMAA) http://www.basmaa.org/
San Diego Stormwater Co -perm ittees Juri sdictional Urban Runoff Management Program (U RM P) -
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Parking/ Storage Area Maintenance SC -43
Description
Parking lots and storage areas can contribute a number of substances, such as trash, suspended solids, hydrocarbons, oil and grease, and heavy metals that can enter receiving waters through stormwater runoff or non-stormwater discharges. The following protocols are intended to prevent or reduce the discharge of pollutants from parking/storage areas and include using good housekeeping practices, following appropriate cleaning BM Ps, and training employees.
Approach
Pollution Prevention
• Encourage alternative designs and maintenance strategies for impervious parking lots. (See New Development and
Redevelopment BMP Handbook).
• Keep accurate maintenance logs to evaluate BM P
implementation.
Suggested Protocols
General
• Keep the parking and storage areas clean and orderly.
Remove debris in a timely fashion.
• Allow sheet runoff to flow into biofilters (vegetated strip and swale) and/or infiltration devices.
• Utilize sand filters or oleophiliccollectorsfor oily waste in low concentrations.
Objectives
• Cover
• Contain
• Educate
• ReducelMnirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Derrending
0 0 0 0 0 0 0 0
CA LI€OR V I -A 4n iMK 9 TEN
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■ Arrange rooftop drains to prevent drainage directly onto paved surfaces. ■ Design lot to include semi -permeable hardscape.
Controlling Litter
■ Post "No Littering" signs and enforce anti -litter laws. ■ Provide an adequate number of litter receptacles.
■ Clean out and cover litter receptacles frequently to prevent spillage. ■ Provide trash receptacles in parking lots to discourage litter. ■ Routinely sweep, shovel and dispose of litter in the trash.
Surface cleaning
■ Use dry cleaning methods (e.g. sweeping or vacuuming) to prevent the discharge of pollutants into the stormwater conveyance system.
■ Establish frequency of public parking lot sweeping based on usage and field observations of waste accumulation.
■ Sweep all parking lots at least once before the onset of the wet season. ■ If water is used follow the procedures below:
Block the storm drain or contain runoff.
Wash water should be collected and pumped to the sanitary sewer or discharged to a pervious surface, do not allow wash water to enter storm drains.
Dispose of parking lot sweeping debris and dirt at a landfill. ■ When cleaning heavy oily deposits:
Use absorbent materials on oily spots prior to sweeping or washing.
Dispose of used absorbents appropriately.
Surface Repair
■ Pre -heat, transfer or load hot bituminous material away from storm drain inlets. ■ Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form contacting stormwater runoff.
■ Cover and seal nearby storm drain inlets (with waterproof material or mesh) and manholes before applying seal coat, slurry seal, etc., where applicable. Leave covers in place until job is complete and until all water from emulsified oil sealants has drained or evaporated. Clean anydebrisfrom these covered manholes and drains for proper disposal. 2 of 4 California Stormwater BMP Handbook
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■ Use only as much water as necessary for dust control, to avoid runoff. ■ Catch drips from paving equipment that isnot in use with pans or absorbent material placed under the machines. Dispose of collected material and absorbents properly.
Inspection
■ Have designated personnel conduct inspections of the parking facilities and stormwater conveyance systems associated with them on a regular basis. ■ 1 nspect cleaning equipment/sweepersfor leaks on a regular basis.
Training
■ Provide regular training to field employees and/ or contractors regarding cleaning of paved areas and proper operation of equipment.
■ Train employees and contractors in proper techniques for spill containment and cleanup.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Keep your Spill Prevention Control and countermeasure(SPCC) plan up-to-date, nad implement accordingly.
■ Have spill cleanup materials readily available and in a known location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ Limitations related to sweeping activities at large parking facilities may include high equipment costs, the need for sweeper operator training, and the inability of current sweeper technology to remove of l and grease.
Requirements
Costs
Cleaning/sweeping costs can be quite large, construction and maintenance of stormwater structural controls can be quite expensive as well.
Maintenance
■ Sweep parking lot to minimize cleaning with water.
■ Clean out oil/water/sand separators regularly, especially after heavy storms. ■ Clean parking facilities on aregular basisto prevent accumulated wastes and pollutants from being discharged into conveyance systems during rainy conditions.
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Supplemental I nformation
Further Detail of the BMP
Surface Repair
Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form contacting sormwater runoff. Where applicable, cover and seal nearby storm drain inlets (with waterproof material or mesh) and manholes before applyi ng seal coat, slurry seal, etc. Leave covers in place until job iscompleteand until all water from emulsified oil sealants has drained or evaporated. Clean anydebrisfrom these covered manholes and drains for proper disposal.
Use only as much water as necessary for dust control, to avoid runoff.
References and Resources
http://www.stormwatercenter.net/
California's Nonpoint Source Program Plan http://www.swrcb.ca.gov/nps/index.html Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality control Board. July 1998 (Revised February 2002 by the California Coastal Commission).
Orange County Stormwater Program
http://www.ocwatersheds.com/StornnWater/swp_introduction.asp Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for Maintenance Practices. June 1998.
Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies Association (BASMAA) http://www.basma.org
San Diego Stormwater Co -perm ittees Juri sdictional Urban Runoff Management Program (URMP)
http://www.projectcleanwater.org/pdf/ Model%20Program%20M unicipal%20Facilities.pdf 4 of 4 California Stormwater BMP Handbook
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Housekeeping Practices
SC -60
Description
Promote efficient and safe housekeeping practices (storage, use, and cleanup) when handling potentially harmful materials such as fertilizers, pesticides, cleaning solutions, paint products, automotive products, and swimming pool chemicals. Related information is provided in BMPfact sheetsSC-11 Spill
Prevention, Control & Cleanup and SC -34 Waste Handling & Disposal.
Approach
Pollution Prevention
• Purchase only the amount of material that will be needed for foreseeable use. In most casesthiswill result in cost savings in both purchasing and disposal. SeeSC-61 Safer Alternative Productsfor additional information.
• Be aware of new products that may do the same job with less environmental risk and for lessor the equivalent cost. Total cost must be used here; this includes purchase price,
transportation costs, storage costs, use related costs, clean up costs and disposal costs.
Suggested Protocols
General
• Keep work sites clean and orderly. Remove debris in a timely fashion. Sweep the area.
• Dispose of wash water, sweepings, and sediments, properly. • Recycle or dispose of fluids properly.
• Establish a daily checklist of office, yard and plant areas to confirm cleanliness and adherence to proper storage and security. Specific em ployees should be assigned specific inspection responsibilities and given the authority to remedy any problems found.
• Post waste disposal charts in appropriate locationsdetailing for each waste its hazardous nature (poison, corrosive, flammable), prohibitions on its disposal (dumpster, drain, sewer) and the recommended disposal method (recycle,
sewer, burn, storage, landfill).
• Summarize the chosen BM Ps applicable to your operation and post them in appropriate conspicuous places.
Objectives
• Cover
• Contain
• Educate
• ReducelMnirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Derrending
0 0 0 0 0 0 0 0
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■ Requi re a signed checklist from every user of any hazardous material detailing amount taken, amount used, amount returned and disposal of spent material. ■ Do a before audit of your site to establish baseline conditions and regular subsequent audits to note any changes and whether conditions are improving or deteriorating. ■ Keep records of water, air and solid wastequantitiesand quality tests and their disposition. ■ Maintain a mass balance of incoming, outgoing and on hand materials so you know when there are unknown losses that need to be tracked down and accounted for. ■ Use and reward employee suggestions related to BM Ps, hazards, pollution reduction, work place safety, cost reduction, alternative materials and procedures, recycling and disposal. ■ Have, and review regularly, acontingency plan for spills, leaks, weather extremes etc. Make sure all employees know about it and what their role is so that it comes into force automatically.
Training
■ Train all employees, management, office, yard, manufacturing, field and clerical in BM Ps and pollution prevention and make them accountable.
■ Train municipal employees who handle potentially harmful materials in good housekeeping practices.
■ Train personnel who use pesticides in the proper use of the pesticides. The California Department of Pesticide Regulation license pesticide dealers, certify pesticide applicators and conduct onsite inspections.
■ Train employees and contractorsin proper techniques for spill containment and cleanup.
The employee should havethe tools and knowledge to immediately begin cleaning up a spill if one should occur.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Keep your Spill Prevention Control and Countermeasure (SPCC) plant up-to-date, and implement accordingly.
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly dispose of spill cleanup material.
Other Considerations
■ There are no major limitations to this best management practice. ■ There are no regulatory requirements to this BM P. Existing regulations already require municipalities to properly store, use, and dispose of hazardous materials 2 of 3 California Stormwater BMP Handbook
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Requirements
Costs
■ Minimal cost associated with thisBMP. Implementation of good housekeeping practices may result in cost savings as these procedures may reduce the need for more costly BM Ps.
Maintenance
■ Ongoing maintenance required to keep a clean site. Level of effort is a function of site size and type of activities.
Supplemental I nformation
Further Detail of the BMP
■ The California Integrated Waste Management Board's Recycling Hotline, 1-800-553-2962, provides information on household hazardous waste collection programs and facilities.
Examples
There are a number of communities with effective programs. The most pro -active include Santa Clara County and the City of Palo Alto, the City and County of San Francisco, and the Municipality of Metropolitan Seattle (Metro).
References and Resources
British Columbia Lake Stewardship Society. Best Management Practices to Protect Water Quality from Non -Point Source Pollution. March 2000.
http://www.nalms.org/bcIss/bmphome.html#bmp
King County Stormwater Pollution Control Manual - http://dnr.metrokc.gov/wlr/dss/spcm.htm Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities, Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July, 1998, Revised by California Coastal Commission, February 2002.
Orange County Stormwater Program
http://www.ocwatersheds.com/stormwater/swp introduction.asp San Mateo STOPPP - ( http://stoppp.tripod.com/bmp.html) January 2003
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Safer Alternative Products
SC -61
Descriptions
Promote the use of less harmful products. Alternatives exist for most product classes including chemical fertilizers, pesticides, cleaning solutions, janitorial chemicals, automotive and paint products, and consumables (batteries, fluorescent lamps).
Approach
Develop a comprehensive program based on:
• The"Precautionary Principle," which is an alternative to the "Risk Assessment" model that says it's acceptable to use a potentially harmful product until physical evidence of its harmful effects are established and deemed too costly from an environmental or public health perspective. For instance, a risk assessment approach might say it's acceptable to use a pesticide until there is direct proof of an environmental impact. The Precautionary Principle approach is used to evaluate whether a given product is safe, whether it is really necessary, and whether alternative products would perform just as well.
• Environmentally Preferable Purchasing Program to minimize the purchase of products containing hazardous ingredients used in thefacility'scustodial services, fleet maintenance, and facility maintenance in favor of using alternate products that pose less risk to employees and to the environment. • Integrated Pest Management (IPM) or Less -Toxic Pesticide Program, which uses a pest management approach that
minimizes the use of toxic chemicals and gets rid of pests by methods that pose a lower risk to employees, the public, and the environment.
• Energy Efficiency Program including no -cost and low-cost energy conservation and efficiency actions that can reduce both energy consumption and electricity bills, along with long-term energy efficiency investments.
Consider the following mechanisms for developing and
implementing a comprehensive program:
• Policies
• Procedures
- Standard operating procedures (SOPs)
- Purchasing guidelines and procedures
Objectives
• Educate
• Reduce/Mninize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
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- Bid packages(servicesand supplies)
■ Materials
Preferred or approved product and supplier lists
Product and supplier evaluation criteria
Training sessions and manuals
Fact sheets for employees
Training
■ Employees who handle potentially harmful materials in the use of safer alternatives. ■ Purchasing departments should be encouraged to procure less hazardous materials and products that contain little or no harmful substances or TM DL pollutants.
Regulations
This BMP has no regulatory requirements. Existing regulations already encourage facilities to reduce the use of hazardous materials through incentives such as reduced:
■ Specialized equipment storage and handling requirements, ■ Stormwater runoff sampling requirements,
■ Training and licensing requirements, and
■ Record keeping and reporting requirements.
Equipment
■ There are no major equipment requirements to this BM P.
Limitations
■ Alternative products may not be available, suitable, or effective in every case.
Requirements
Costs
■ The primary cost isfor staff timeto: 1) develop new policies and procedures and 2) educate purchasing departments and employees who handle potentially harmful materials about the availability, procurement, and use of safer alternatives. ■ Some alternative products may be slightly moreexpensivethan conventional products.
Supplemental I nformation
Employees and contractors/ service providers can both be educated about safer alternatives by using information developed by a number of organizations including the references and resources listed below.
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Thefollowingdiscussion provides some general information on safer alternatives. More specific information on particular hazardous materials and the available alternatives may be found in the references and resources listed below.
■ Automotive products— Less toxi c alternatives are not available for many automotive products, especially enginefluids. But there are alternatives to grease lubricants, car polishes, degreasers, and windshield washer solution. Rerefined motor oil is also available. ■ Vehicle/Trailer lubrication— Fifth wheel bearings on trucks require routine lubrication.
Adhesive lubricants are avai lable to replace typical chassis grease. ■ Cleaners— Vegetables -based or citrus -based soaps are available to replace petroleum -based soaps/ detergents.
■ Paint products— Water -based paints, wood preservatives, stains, and finishes are available. ■ Pesticides— Specific alternative products or methods exist to control most insects, fungi, and weeds.
■ Chemical Fertilizers— Compost and soil amendments are natural alternatives. ■ Consumables— Manufacturers have either reduced or are in the process of reducing the amount of heavy metals in consumables such as batteries and fluorescent lamps. All fluorescent lamps contain mercury, however low -mercury containing lamps are now available from most hardware and lighting stores. Fluorescent lamps are also more energy efficient than the average incandescent lamp.
■ Janitorial chemicals— Even biodegradable soap can harm fish and wildlife before it biodegrades. Biodegradable does not mean non-toxic. Safer products and procedures are available for floor stripping and cleaning, aswell as carpet, glass, metal, and restroom cleaning and disinfecting.
Examples
There area number of business and trade associations, and communities with effective programs. Some of the more prominent are listed below in the references and resources section.
References and Resources
Note: Many of these references provide alternative products for materials that typically are used inside and disposed to the sanitary sewer aswell as alternatives to products that usually end up in the storm drain.
General Sustainable Practices and Pollution Prevention Including Pollutant - Specific Information
California Department of Toxic Substances Control ( www.dtsc.ca.gov) California I ntegrated Waste Management Board ( www.ciwmb.ca.gov) City of Santa Monica ( www.santa-monica.org/environment) City of Palo Alto ( www.city.palo-alto.ca.us/ cleanbay) January 2003
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City and County of San Francisco, Department of the Environment ( www.ci.sf.ca.us/ sfenvi ron m ent)
Earth 911 ( www.earth911.org/ master.asp)
Environmental Finance Center Region IX ( www.greenstart.org/efc9) Flex Your Power ( www.flexyourpower.ca.gov)
GreenBiz.com ( www.greenbiz.com)
Green Business Program ( www.abag.org/ bayarea/ envi ro/ gbus/ gb.htm I ) Pacific Industrial and Business Association ( www.piba.org) Sacramento Clean Water Business Partners ( www.sacstormwater.org) USEPA BM P fact sheet — Alternative products
( http://cfpub.epa.gov/ npdes/ stormwater/ menuofbmps/ poll_2.cfm) USEPA Region IX Pollution Prevention Program ( www.epa.gov/region09/p2) Western Regional Pollution Prevention Network ( www.westp2net.org) Metals (mercury, copper)
National Electrical Manufacturers Association - Environment, Health and Safety ( www.nema.org)
Sustainable Conservation ( www.suscon.org)
Auto Recycling Project
Brake Pad Partnership
Pesticides and Chemical Fertilizers
Bio-Integral Resource Center ( www.birc.org)
California Department of Pesticide Regulation ( www.cdpr.ca.gov) University of California Statewide I PM Program ( www.ipm.ucdavis.edu/default.html) Dioxins
Bay Area Dioxins Project ( http://dioxin.abag.ca.gov/)
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Road and Street Maintenance
SC -70
Description
Streets, roads, and highwaysaresignificant sources of pollutants in stormwater discharges, and operation and maintenance (O&M) practices, if not conducted properly, can contribute to the problem. Stormwater pollution from roadway and bridge
maintenance should be addressed on a site -specific basis. Use of the procedures outlined below, that address street sweeping and repair, bridge and structure maintenance, and unpaved roads will reduce pollutants in stormwater.
Approach
Pollution Prevention
• Use the least toxic materials available (e.g. water based paints, gels or sprays for graffiti removal)
• Recycle paint and other materials whenever possible.
• Enlist the help of citizens to keep yard waste, used oil, and other wastes out of the gutter.
Suggested Protocols
Street Sweeping and Cleaning
• Maintain a consistent sweeping schedule. Provide minimum monthly sweeping of curbed streets.
• Perform street cleaning during dry weather if possible.
Objectives
• Cover
• Contain
• Educate
• Reduce/Nininize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
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■ Avoid wet cleaning or flushing of street, and utilize dry methods where possible. ■ Consider increasing sweeping frequency based on factors such as traffic volume, land use, field observations of sediment and trash accumulation, proximity to water courses, etc. For example:
Increase the sweeping frequency for streets with high pollutant loadings, especially in high traffic and industrial areas.
Increasethesweepingfrequencyjust before the wet season to remove sediments accumulated during the summer.
Increase the sweeping frequency for streets in special problem areas such as special events, high litter or erosion zones.
■ Maintain cleaning equipment in good working condition and purchase replacement equipment as needed. Old sweepers should be replaced with new technologically advanced sweepers (preferably regenerative air sweepers) that maximize pollutant removal. ■ Operate sweepers at manufacturer requested optimal speed levels to increase effectiveness. ■ To increase sweeping effectiveness consider thefollowing:
Institute a parking policy to restrict parking in problematic areas during periods of street sweeping.
Post permanent street sweeping signs in problematic areas; use temporary signs if installation of permanent signs is not possible.
Develop and distribute flyers notifying residents of street sweeping schedules. ■ Regularly inspect vehicles and equipment for leaks, and repair immediately. ■ If available use vacuum or regenerative air sweepers in the high sediment and trash areas (typically industrial/commercial).
■ Keep accurate logs of the number of curb -miles swept and the amount of waste collected. ■ Dispose of street sweeping debris and dirt at a landfill. ■ Do not store swept material along the side of the street or near a storm drain inlet. ■ Keep debris storage to a minimum during the wet season or make sure debris piles are contained (e.g. by bermi ng the area) or covered (e.g. with tarps or permanent covers).
Street Repair and Maintenance
Pavement marking
■ Schedule pavement marking activities for dry weather. 2 of 9 California Stormwater BMP Handbook
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■ Develop paint handling procedures for proper use, storage, and disposal of paints. ■ Transfer and load paint and hot thermoplastic away from storm drain inlets. ■ Provide drop cloths and drip pans in paint mixing areas. ■ Properly maintain application equipment.
■ Street sweep thermoplastic grindings. Yellow thermoplastic grindings may require special handling as they may contain lead.
■ Paints containing lead or tributyltin are considered a hazardous waste and must be disposed of properly.
■ Use water based paints whenever possible. If using water based paints, clean the application equipment in a sink that is connected to the sanitary sewer. ■ Properly store leftover paints if they are to be kept for the next job, or dispose of properly.
Concrete installation and repair
■ Schedule asphalt and concrete activities for dry weather. ■ Take measures to protect any nearby storm drain inlets and adjacent watercourses, prior to breaking up asphalt or concrete (e.g. place san bags around i nlets or work areas). ■ Limit the amount of fresh concrete or cement mortar mixed, mix only what is needed for the job.
■ Store concrete materials under cover, away from drainage areas. Secure bags of cement after they are open. Be sure to keep wind-blown cement powder away from streets, gutters, storm drains, rainfall, and runoff.
■ Return leftover materials to the transit mixer. Dispose of small amounts of hardened excess concrete, grout, and mortar in the trash.
■ Do not wash sweepings from exposed aggregate concrete into the street or storm drain.
Collect and return sweepings to aggregate base stockpile, or dispose in the trash. ■ When making saw cuts in pavement, use as little water as possible and perform during dry weather. Cover each storm drain inlet completely with filter fabric or plastic during the sawing operation and contain the slurry by placing straw bales, sandbags, or gravel dams around the inlets. After the liquid drains or evaporates, shovel or vacuum the slurry residue from the pavement or gutter and remove from site. Alternatively, asmall onsitevacuum may be used to pick up the slurry as this will prohibit slurry from reaching storm drain inlets.
■ Wash concrete trucks off site or in designated areas on site designed to preclude discharge of wash water to drainagesystem.
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Patching, resurfacing, and surface sealing
■ Schedule patching, resurfacing and surface sealing for dry weather. ■ Stockpile materials away from streets, gutter areas, storm drain inlets or watercourses.
During wet weather, cover stockpiles with plastic tarps or berm around them if necessary to prevent transport of materials in runoff.
■ Pre -heat, transfer or load hot bituminous material away from drainage systems or watercourses.
■ Where applicable, cover and seal nearby storm drain inlets (with waterproof material or mesh) and maintenance holes before applying seal coat, slurry seal, etc. Leave covers in place until job is complete and until all water from emulsified oil sealants has drained or evaporated. Clean any debris from covered maintenanceholesand storm drain inlets when the job is complete.
■ Prevent excess material from exposed aggregate concrete or similar treatments from entering streets or storm drain inlets. Designate an area for clean up and proper disposal of excess materials.
■ Use only as much water as necessary for dust control, to avoid runoff. ■ Sweep, never hose down streets to clean up tracked dirt. Use a street sweeper or vacuum truck. Do not dump vacuumed liquid in storm drains.
■ Catch drips from paving equipment that isnot in use with pans or absorbent material placed under the machines. Dispose of collected material and absorbents properly.
Equipment cleaning maintenance and storage
■ Inspect equipment daily and repair any leaks. Place drip pans or absorbent materials under heavy equipment when not in use.
■ Perform major equipment repairs at the corporation yard, when practical. ■ If refueling or repairing vehicles and equipment must bedoneonsite, usea location away from storm drain inlets and watercourses.
■ Clean equipment including sprayers, sprayer paint supply lines, patch and paving equipment, and mud jacking equipment at the end of each day. Clean in a sink or other area (e.g. vehicle wash area) that is connected to the sanitary sewer.
Bridgeand Structure Maintenance
Paint and Paint Removal
■ Transport paint and materials to and from job sites in containers with secure lids and tied down to the transport vehicle.
■ Do not transfer or load paint near storm drain inlets or watercourses. 4 of 9 California Stormwater BMP Handbook
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■ Test and inspect spray equipment prior to starting to paint. Tighten all hoses and connections and do not overfill paint container.
■ Plug nearby storm drain inlets prior to starting painting where there is significant risk of a spill reaching storm drains. Remove plugs when job is completed. ■ If sand blasting is used to remove paint, cover nearby storm drain inlets prior to starting work.
■ Perform work on a maintenance traveler or platform, or use suspended netting or tarps to capture paint, rust, paint removing agents, or other materials, to prevent discharge of materials to surface waters if the bridge crosses a watercourse. If sanding, use a sander with a vacuum filter bag.
■ Capture all clean-up water, and dispose of properly.
■ Recycle paint when possible (e.g. paint may be used for graffiti removal activities). Dispose of unused paint at an appropriate household hazardous waste facility.
Graffiti Removal
■ Schedule graffiti removal activities for dry weather. ■ Protect nearby storm drain inlets prior to removing graffiti from walls, signs, sidewalks, or other structures needing graffiti abatement. Clean up afterwards by sweeping or vacuuming thoroughly, and/or by using absorbent and properly disposing of the absorbent. ■ When graffiti is removed by painting over, implement the procedures under Painting and Paint Removal above.
■ Direct runoff from sand blasting and high pressure washing (with no cleaning agents) into a landscaped or dirt area. If such an area is not available, filter runoff through an appropriate filtering device (e.g. filter fabric) to keep sand, particles, and debris out of storm drains. ■ If a graffiti abatement method generates wash water containing a cleaning compound (such as high pressure washing with a cleaning compound), plug nearby storm drains and vacuum/ pump wash water to the sanitary sewer.
■ Consider using a waterless and non-toxic chemical cleaning method for graffiti removal (e.g. gels or spray compounds).
Repair Work
■ Prevent concrete, steel, wood, metal parts, tools, or other work materials from entering storm drains or watercourses.
■ Thoroughly clean up the job site when the repair work is completed. ■ When cleaning guardrails or fences follow the appropriate surface cleaning methods (depending on the type of surface) outlined in SC -71 Plaza & Sidewalk Cleaning fact sheet.
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■ If painting is conducted, follow the painting and paint removal procedures above. ■ If graffiti removal is conducted, follow the graffiti removal procedures above. ■ If construction takes place, see the Construction Activity BM P Handbook. ■ Recycle materials whenever possible.
Unpaved Roadsand Trails
■ Stabilize exposed soil areas to prevent soil from eroding during rain events. This is particularly important on steep slopes.
■ For roadside areas with exposed soils, the most cost-effective choice is to vegetate the area, preferably with a mulch or binder that will hold the soils in place while the vegetation is establishing. Native vegetation should be used if possible. ■ If vegetation cannot be established immediately, apply temporary erosion control mats/ blankets; a comma straw, or gravel as appropriate. ■ If sediment is already eroded and mobilized in roadside areas, temporary controls should be installed. These may include: sediment control fences, fabric -covered triangular dikes, gravel -filled burlap bags, biobags, or hay bales staked in place.
Non-Stormwater Discharges
Field crews should be aware of non-stormwater discharges as part of their ongoing street maintenance efforts.
■ Refer to SC -10 Non-Stormwater Discharges
■ Identify location, time and estimated quantity of discharges. ■ Notify appropriate personnel.
Training
■ Train employees regarding proper street sweeping operation and street repair and maintenance.
■ Instruct employees and subcontractors to ensure that measures to reduce the stormwater impacts of roadway/ bridge mai ntenance are being followed. ■ Require engineering staff and/or consulting A/ E firms to address stormwater quality in new bridge designs or existing bridge retrofits.
■ Use training log or similar method to document training. ■ Train employees on proper spill containment and clean up, and in identifying non- stormwater discharges.
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Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Keep your Spill Prevention Control and countermeasure(SPCC) plan up-to-date, and implement accordingly.
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ Densely populated areas or heavily used streets may require parking regulations to clear streets for cleaning.
■ No currently available conventional sweeper is effective at removing oil and grease.
Mechanical sweepers are not effective at removing finer sediments. ■ Limitations may arise in the location of new bridges. The availability and cost of land and other economic and political factors may dictate where the placement of anew bridge will occur. Better design of the bridge to control runoff is required if it is being placed near sensitive waters.
Requirements
Costs
■ The maintenance of local roads and bridges is already a consideration of most community public works or transportation departments. Therefore, the cost of pollutant reducing management practices will involvethetraining and equipment required to implement these new practices.
■ The largest expenditures for street sweeping programs are in staffing and equipment. The capital cost for a conventional street sweeper is between $60,000 and $120,000. Newer technologies might have prices approaching $180,000. The average useful life of a conventional sweeper is about four years, and programs must budget for equipment replacement. Sweeping frequencies will determine equipment life, so programs that sweep more often should expect to have a higher cost of replacement. ■ A street sweeping program may requirethefollowing.
- Sweeper operators, maintenance, supervisory, and administrative personnel are required.
- Traffic control officers may be required to enforce parking restrictions. - Skillful design of cleaning routes is required for program to be productive. - Arrangements must be made for disposal of collected wastes.
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■ If investing in newer technologies, training for operators must be included in operation and maintenance budgets. Costs for public education are small, and mostly deal with the need to obey parking restrictions and litter control. Parking tickets are an effective reminder to obey parking rules, as well as being a source of revenue.
Maintenance
■ Not applicable
Supplemental I nformation
Further Detail of the BMP
Street sweeping
There are advantages and disadvantages to the two common types of sweepers. The best choice depends on your specific conditions. Many communities find it useful to have a compliment of both types in their fleet.
Mechanical Broom Sweepers- Moreeffectiveat picking up large debris and cleaning wet streets.
Less costly to purchase and operate. Create more airborne dust.
Vacuum Sweepers- M ore effective at removing fine particles and associated heavy metals.
Ineffective at cleaning wet streets. Noisier than mechanical broom sweepers which may restrict areas or times of operation. May require an advance vehicle to remove large debris.
Street Fl ushers- Not affected by biggest interference to cleaning, parked cars. May removefiner sediments, moving them toward the gutter and stormwater inlets. For this reason, flushing fell out of favor and is now used primarily after sweeping. Flushing may be effective for combined sewer systems. Presently street flushing is not allowed under most NPDES permits.
Cross -Media Transfer of Pollutants
The California Air Resources Board (ARB) has established state ambient air quality standards including a standard for respirable particulate matter (less than or equal to 10 microns in diameter, symbolized as PM 10). In the effort to sweep up finer sediments to remove attached heavy metals, municipalities should be aware that fine dust, that cannot be captured by the sweeping equipment and becomes airborne, could lead to issues of worker and public safety.
Bridges
Bridges that carry vehicular traffic generate some of the more direct discharges of runoff to surface waters. Bridge scupper drains cause a direct discharge of stormwater into receiving waters and have been shown to carry relatively high concentrations of pollutants. Bridge maintenance also generates wastes that may be either directly deposited to the water below or carried to the receiving water by stormwater. The following steps will help reduce the stormwater impacts of bridge maintenance:
■ Site new bridges so that significant adverse i mpacts to wetlands, sensitive areas, critical habitat, and riparian vegetation are minimized.
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■ Design new bridges to avoid the use of scupper drains and route runoff to land for treatment control. Existing scupper drains should be cleaned on a regular basis to avoid sediment/ debris accumulation.
■ Reduce the discharge of pollutants to surface waters during maintenance by using suspended traps, vacuums, or booms in the water to capture paint, rust, and paint removing agents. Many of these wastes may be hazardous. Properly dispose of this waste by referring to CA21 (Hazardous Waste Management) in the Construction Handbook. ■ Train employees and subcontractors to reduce the discharge of wastes during bridge maintenance.
De-icing
■ Do not over -apply deicing salt and sand, and routinely calibrate spreaders. ■ Near reservoirs, restrict the application of deicing salt and redirect any runoff away from reservoirs.
■ Consider using alternative deicing agents (less toxic, biodegradable, etc.).
References and Resources
Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July. 1998.
Orange County Stormwater Program
http:/ / www.ocwatersheds.com/ stormwater/swp introduction.asp Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for Maintenance Practices. June 1998.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 2001. Fresh Concrete and Mortar Application Best Management Practices for the Construction Industry. June.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 2001. Roadwork and Paving Best Management Practices for the Construction Industry. June.
United States Environmental Protection Agency (USEPA). 2002. Pollution Prevention/ Good Housekeeping for Municipal Operations Roadway and Bridge Maintenance. On-line http:/ / www.epa.gov/ npdes/ menuofbmps/ poll 13.htm
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Plaza and Sidewalk Cleaning
SC -71
Description
Pollutants on sidewalks and other pedestrian traffic areas and plazasaretypicallyduetolitteringandvehicleuse. This fact sheet describes good housekeeping practices that can be incorporated into the municipality's existing cleaning and maintenance program.
Approach
Pollution Prevention
• Use dry cleaning methods whenever practical for surface cleaning activities.
• Use the least toxic materials available (e.g. water based paints, gels or sprays for graffiti removal).
Suggested Protocols
SurfaceCleaning
• Regularly broom (dry) sweep sidewalk, plaza and parking lot areas to minimize cleaning with water.
• Dry cleanup first (sweep, collect, and dispose of debris and trash) when cleaning sidewalks or plazas, then wash with or without soap.
• Block the storm drain or contain runoff when cleaning with water. Discharge wash water to landscaping or collect water and pump to a tank or discharge to sanitary sewer if allowed. (Permission may be required from local sanitation district.) Objectives
• Cover
• Contain
• Educate
• Reduce/Nininize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0 0 0 0 0 0 0 0
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■ Block the storm drain or contain runoff when washing parking areas, driveways or drive- throughs. Use absorbents to pick up oil; then dry sweep. Clean with or without soap.
Collect water and pump to a tank or discharge to sanitary sewer if allowed. Street Repair and Maintenance.
Graffiti Removal
■ Avoid graffiti abatement activities during rain events. ■ Implement the procedures under Painting and Paint Removal in SC -70 Roads, Streets, and Highway Operation and Maintenance fact sheet when graffiti is removed by painting over. ■ Direct runoff from sand blasting and high pressure washing (with no cleaning agents) into a dirt or landscaped area after treating with an appropriatefiltering device. ■ Plug nearby storm drain inlets and vacuum/ pump wash water to the sanitary sewer if authorized to do so if a graffiti abatement method generates wash water containing a cleaning compound (such as high pressure washing with a cleaning compound). Ensure that a non -hazardous cleaning compound is used or dispose as hazardous waste, as appropriate.
Surface Removal and Repair
■ Schedule surface removal activiti es for dry weather if possible. ■ Avoid creating excess dust when breaking asphalt or concrete. ■ Take measures to protect nearby storm drain inlets prior to breaking up asphalt or concrete (e.g. place hay bales or sand bags around inlets). Clean afterwards by sweeping up as much material as possible.
■ Designate an area for clean up and proper disposal of excess materials. ■ Remove and recycle as much of the broken pavement as possi ble to avoid contact with rainfall and stormwater runoff.
■ When making saw cuts in pavement, use as little water as possible. Cover each storm drain inlet completely with filter fabric during the sawing operation and contain the slurry by placing straw bales, sandbags, or gravel dams around the inlets. After the liquid drains or evaporates, shovel or vacuum the slurry residuefrom the pavement or gutter and remove from site.
■ Always dry sweep first to clean up tracked dirt. Use a street sweeper or vacuum truck. Do not dump vacuumed liquid in storm drains. Once dry sweeping is complete, the area may be hosed down if needed. Wash water should be directed to landscaping or collected and pumped to the sanitary sewer if allowed.
Concrete Installation and Repair
■ Schedule asphalt and concrete activities for dry weather. 2 of 5 California Stormwater BMP Handbook
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■ Take measures to protect any nearby storm drain inlets and adjacent watercourses, prior to breaking up asphalt or concrete (e.g. place san bags around i nlets or work areas). ■ Limit the amount of fresh concrete or cement mortar mixed, mix only what is needed for the job.
■ Store concrete materials under cover, away from drainage areas. Secure bags of cement after they are open. Be sure to keep wind-blown cement powder away from streets, gutters, storm drains, rainfall, and runoff.
■ Return leftover materials to the transit mixer. Dispose of small amounts of hardened excess concrete, grout, and mortar in the trash.
■ Do not wash sweepings from exposed aggregate concrete into the street or storm drain.
Collect and return sweepings to aggregate base stockpile, or dispose in the trash. ■ Protect applications of fresh concrete from rainfall and runoff until the material has dried. ■ Do not allow excess concrete to bedumped onsite, except in designated areas. ■ Wash concrete trucks off site or in designated areas on site designed to preclude discharge of wash water to drainage system.
Controlling Litter
■ Post "No Littering" signs and enforce anti -litter laws. ■ Provide litter receptacles in busy, high pedestrian traffic areas of the community, at recreational facilities, and at community events.
■ Cover litter receptacles and clean out frequently to prevent leaking/spillage or overflow. ■ Clean parking lots on a regular basiswit h a street sweeper.
Training
■ Provide regular training to field employees and/ or contractors regarding surface cleaning and proper operation of equipment.
■ Train employee and contractors in proper techniques for spill containment and cleanup. ■ Use training log or similar method to document training.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Have spill cleanup materials readily available and in a known location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly dispose of spill cleanup material.
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Other Considerations
■ Limitations related to sweeping activities at large parking facilities may include current sweeper technology to remove oil and grease.
■ Surface cleaning activities that require dischargesto the local seweringagencywill require coordination with the agency.
■ Arrangements for disposal of the swept material collected must be made, as well as accurate tracking of the areas swept and the frequency of sweeping.
Requirements
Costs
■ The largest expenditures for sweeping and cleaning of sidewalks, plazas, and parking lots are in staffing and equipment. Sweeping of these areas should be incorporated into street sweeping programs to reduce costs.
Maintenance
Not applicable
Supplemental I nformation
Further Detail of the BMP
Community education, such as informing residents about their optionsfor recycling and waste disposal, as well as the consequences of littering, can instill asenseof citizen responsibility and potentially reduce the amount of maintenance required by the municipality.
Additional BM Ps that should be considered for parking lot areas include:
■ Allow sheet runoff to flow into biofilters (vegetated strip and swale) and infiltration devices. ■ Utilize sand filtersoroleophiliccollectorsforoilywastein low concentrations. ■ Arrange rooftop drains to prevent drainage di rectly onto paved surfaces. ■ Design lot to include semi -permeable hardscape.
■ Structural BM Ps such as storm drain inlet filters can be very effective in reducing the amount of pollutants discharged from parking facilities during periods of rain.
References and Resources
Bay Area Stormwater Management Agencies Association (BASMAA). 1996. Pollution From Surface Cleani ng Folder http://www.basmaa.org
Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July. 1998.
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Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for Maintenance Practices. June 1998.
Orange County Stormwater Program
http://www.ocwatersheds.com/stormwater/swp introduction.asp Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
Santa Clara Valley Urban Runoff Pollution Prevention Program. Maintenance Best Management Practices for the Construction Industry. Brochures: Landscaping, Gardening, and Pool; Roadwork and Paving; and Fresh Concrete and Mortar Application. June2001.
San Diego Stormwater Co-permitteesJurisdictional Urban Runoff Management Plan. 2001.
Municipal Activities Model Program Guidance. November.
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Landscape Maintenance SC -73
Description
Landscape maintenance activities include vegetation removal; herbicide and insecticide application; fertilizer application; watering; and other gardening and lawn care practices.
Vegetation control typically involves a combination of chemical (herbicide) application and mechanical methods. All of these maintenance practices have the potential to contribute pollutants to the storm drain system. The major objectives of this BM P are to minimize the discharge of pesticides, herbicides and fertilizers to the storm drain system and receiving waters; prevent the disposal of landscape waste into the storm drain system by collecting and properly disposing of clippings and cuttings, and educating employees and the public.
Approach
Pollution Prevention
• Implement an integrated pest management (IPM) program.
I PM is a sustainable approach to managing pests by
combining biological, cultural, physical, and chemical tools. • Choose low water using flowers, trees, shrubs, and
groundcover.
• Consider alternative landscaping techniques such as
naturescaping and xeriscaping.
• Conduct appropriate maintenance (i.e. properly timed
fertilizing, weeding, pest control, and pruning) to help preserve the landscapes water efficiency.
Objectives
• Contain
• Educate
• ReducelMnirrize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
CALIFOR\I1CR-TA' TET,
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SC -73 Landscape Maintenance
■ Consider grasscycling(grasscyclingisthenatural recycling of grass by leaving the clippings on the lawn when mowing. Grass clippings decompose quickly and release valuable nutrients back into the lawn).
Suggested Protocols
Mowing, Trimming, and Weeding
■ Whenever possible use mechanical methods of vegetation removal (e.g mowing with tractor - type or push mowers, hand cutting with gas or electric powered weed trimmers) rather than applying herbicides. Use hand weeding where practical.
■ Avoid loosening the soil when conducting mechanical or manual weed control, this could lead to erosion. Use mulch or other erosion control measures when soils are exposed. ■ Performing mowing at optimal times. Mowing should not be performed if significant rain events are predicted.
■ Mulching mowers may be recommended for certain flat areas. Other techniques may be employed to minimize mowing such as selective vegetative planting using low maintenance grasses and shrubs.
■ Collect lawn and garden clippings, pruning waste, tree trimmings, and weeds. Chip if necessary, and compost or dispose of at a landfill (see waste management section of this fact sheet).
■ Place temporarily stockpiled material away from watercourses, and berm or cover stockpiles to prevent material releases to storm drains.
Planting
■ Determine existing native vegetati on features (location, species, size, function, importance) and consider the feasibilityof protecting them. Consider elements such astheir effect on drainage and erosion, hardiness, maintenance requirements, and possible conflicts between preserving vegetation and the resulting maintenance needs. ■ Retain and/or plant selected native vegetation whose features are determined to be beneficial, wherefeasible. Native vegetation usually requires less maintenance (e.g., irrigation, fertilizer) than planting new vegetation.
■ Consider using low water use groundcovers when planting or replanting.
Waste Management
■ Compost leaves, sticks, or other collected vegetation or dispose of at a permitted landfill. Do not dispose of collected vegetation into waterways or storm drainage systems. ■ Placetemporarilystockpiled material away from watercourses and storm drain inlets, and berm or cover stockpilesto prevent material releases to the storm drain system. ■ Reduce the use of high nitrogen fertilizers that produce excess growth requiring more frequent mowing or trimming.
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Landscape Maintenance SC -73
■ Avoid landscape wastes in and around storm drain inlets by either using bagging equipment or by manually picking up the material.
Irrigation
■ Where practical, use automatic timers to minimize runoff. ■ Use popup sprinkler heads in areas with a lot of activity or where there is a chance the pipes may be broken. Consider the use of mechanisms that reduce water flow to sprinkler heads if broken.
■ Ensure that there is no runoff from the landscaped area(s) if re-claimed water is used for irrigation.
■ If bailing of muddy water is required (e.g. when repairing a water line leak), do not put it in the storm drain; pour over landscaped areas.
■ Irrigate slowly or pulse irrigateto prevent runoff and then only irrigate as much as is needed.
■ Apply water at rates that do not exceed the infiltration rate of the soil.
Fertilizer and Pesticide Management
■ Utilize a comprehensive management system that incorporates integrated pest management (IPM) techniques. There are many methods and types of IPM, including the following:
- Mulching can be used to prevent weeds where turf is absent, fencing installed to keep rodents out, and netting used to keep birds and insects away from leaves and fruit. - Visible insects can be removed by hand (with gloves or tweezers) and placed in soapy water or vegetable oil. Alternatively, insects can be sprayed off the plant with water or in some cases vacuumed off of larger plants.
- Store-bought traps, such as species -specific, pheromone -based traps or colored sticky cards, can be used.
- Slugs can be trapped in small cupsfilled with beer that are set in the ground so the slugs can get in easily.
- In cases where microscopic parasites, such as bacteria and fungi, are causing damage to plants, the affected plant material can be removed and disposed of (pruning equipment should be disinfected with bleach to prevent spreading the diseaseorganism). - Small mammals and birds can be excluded using fences, netting, tree trunk guards. - Beneficial organisms, such as bats, birds, green lacewings, ladybugs, praying mantis, ground beetles, parasitic nematodes, trichogramma wasps, seed head weevils, and spiders that prey on detrimental pest species can be promoted. ■ Follow all federal, state, and local Iaws and regulations governing the use, storage, and disposal of fertilizers and pesticides and training of applicators and pest control advisors.
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SC -73 Landscape Maintenance
■ Use pesticides only if there is an actual pest problem (not on a regular preventative schedule).
■ Do not use pesticides if rain is expected. Apply pesticides only when wind speeds are low (less than 5 mph).
■ Do not mix or prepare pesticides for application near storm drains. ■ Prepare the minimum amount of pesticide needed for the job and use the lowest rate that will effectively control the pest.
■ Employtechniquesto minimize off -target application (e.g. spray drift) of pesticides, including consideration of alternative application techniques. ■ Fertilizers should be worked into the soil rather than dumped or broadcast onto the surface. ■ Calibratefertilizer and pesticide application equipment to avoid excessive application. ■ Periodically test soilsfor determining proper fertilizer use. ■ Sweep pavement and sidewalk if fertilizer is spilled on these surfaces before applying irrigation water.
■ Purchase only the amount of pesticide that you can reasonably use in a given time period (month or year depending on the product).
■ Triple rinse containers, and use rinsewater as product. Dispose of unused pesticide as hazardous waste.
■ Dispose of empty pesticide containers according to the instructions on the container label.
Inspection
■ Inspect irrigation system periodically to ensure that the right amount of water is being applied and that excessive runoff is not occurring. Minimize excess watering, and repair leaks in the irrigation system as soon as they are observed. ■ Inspect pesticide/fertilizer equipment and transportation vehicles daily.
Training
■ Educate and train employees on use of pesticides and in pesticide application techniques to prevent pollution. Pesticide application must be under the supervision of a California qualified pesticide applicator.
■ Train/encourage municipal maintenance crews to use IPM techniquesfor managing public green areas.
■ Annually train employees within departments responsible for pesticide application on the appropriate portions of the agency's I PM Policy, SOPs, and BM Ps, and the latest IPM techniques.
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■ Employees who are not authorized and trained to apply pesticides should be periodically (at least annually) informed that they cannot useover-the-counter pesticides in or around the workplace.
■ Use training log or similar method to document training.
Spill Response and Prevention
■ Refer to SC -11, Spill Prevention, Control & Cleanup
■ Have spill cleanup materials readily available and in a know in location ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ The Federal Pesticide, Fungicide, and RodenticideAct and California Title 3, Division 6, Pesticides and Pest Control Operations pl ace stri ct controls over pesticide appl i cation and handling and specify training, annual refresher, and testing requirements. The regulations generally cover: a list of approved pesticides and selected uses, updated regularly; general application information; equipment use and maintenance procedures; and record keeping.
The California Department of Pesticide Regulations and the County Agricultural Commission coordinate and maintain the licensing and certification programs. All public agency employees who apply pesticides and herbicides in "agricultural use" areas such as parks, golf courses, rights -of -way and recreation areas should be properly certified in accordance with state regulations. Contractsfor landscape mai ntenance should include similar requirements.
■ All employees who handle pesticides should befamiliar with the most recent material safety data sheet (MSDS) files.
■ Municipalitiesdo not have the authority to regulatethe use of pesticides by school districts, however the California Healthy Schools Act of 2000 (AB 2260) has imposed requirements on California school districts regarding pesticide use in schools. Posting of notification prior to the application of pesticides is now required, and IPM is stated as the preferred approach to pest management in schools.
Requirements
Costs
Additional training of municipal employees will be required to address IPM techniques and BM Ps. IPM methodswill likely increase labor cost for pest control which may be offset by lower chemical costs.
Maintenance
Not applicable
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SC -73 Landscape Maintenance
Supplemental 1 nformation
Further Detail of the BMP
Waste Management
Composting is one of the better disposal alternatives if locally available. Most municipalities either have or are planning yard waste composting facilities as a means of reducing the amount of waste going to the landfill. Lawn clippingsfrom municipal maintenance programs as well as private sources would probably be compatible with most composting facilities Contractors and Other Pesticide Users
Municipal agencies should develop and implement a process to ensure that any contractor employed to conduct pest control and pesticide application on municipal property engages in pest control methods consistent with the 1 PM Policy adopted by the agency. Specifically, municipalities should require contractors to followtheagency'sIPM policy, SOPs, and BM Ps; provide evidence to the agency of having received training on current I PM techniques when feasible; provide documentation of pesticide use on agency property to the agency in a timely manner.
References and Resources
King County Stormwater Pollution Control Manual. Best Management Practices for Businesses. 1995. King County Surface Water Management. July. On-line:
http://dnr.metrokc.gov/wlr/dss/spcm.htm
Los Angeles County Stormwater Quality Model Programs. Public Agency Activities http:// ladpw.org/wmd/ npdes/ model links.cfm
Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July. 1998.
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
United States Environmental Protection Agency (USEPA). 2002. Pollution Prevention/ Good H ousekeeping for Municipal Operations Landscaping and Lawn Care. Office of Water. Office of Wastewater Management. On-line: http://www.epa.gov/ npdes/ menuofbmps/ poll 8.htm 6 of 6 California Stormwater BMP Handbook
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Drainage System Maintenance
SC -74
Photo Credit: Geoff Brosseau
Description
Asa consequence of its function, the stormwater conveyance system collects and transports urban runoff that may contain certain pollutants. Maintaining catch basins, stormwater inlets, and other stormwater conveyance structures on a regular basis will remove pollutants, prevent clogging of the downstream conveyance system, restore catch basins' sediment trapping capacity, and ensurethe system functions properly hydraulically to avoid flooding.
Approach
Suggested Protocols
Catch Basins/Inlet Structures
• Municipal staff should regularly inspect facilities to ensure the fol lowi ng:
- Immediate repair of any deterioration threatening
structural integrity.
- Cleaning before the sum p is40%full. Catch basins
should be cleaned as frequently as needed to meet this
standard.
- St en ci l i n g of catch basins and inlets (see SC -75 Waste Handling and Disposal).
• Clean catch basins, storm drain inlets, and other conveyance structures in high pollutant load areas just before the wet season to remove sediments and debris accumulated during the summer.
Objectives
• Contain
• Educate
• Reduce/Mnirrize
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0 0 0 0 0 0 0 0
CALIRORNl \�Fr`R1111; 1fFf�
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SC -74 Drainage System Maintenance
■ Conduct inspectionsmorefrequentlyduringthewet season for problem areas where sediment or trash accumulates more often. Clean and repair as needed. ■ Keep accurate logs of the number of catch basins cleaned. ■ Record the amount of waste collected.
■ Store wastes collected from cleaning activities of thedrainagesystem in appropriate contai ners or temporary storage sites in a manner that prevents discharge to the storm drain.
■ Dewater the wastes with outflow into the sanitary sewer if permitted. Water should be treated with an appropriate filtering device prior to discharge to the sanitary sewer. If discharge to the sanitary sewer is not allowed, water should be pumped or vacuumed to a tank and properly disposed of. Do not dewater near a storm drain or stream. ■ Except for small communitieswith relatively few catch basins that may be cleaned manually, most municipalitieswill require mechanical cleaners such aseductors, vacuums, or bucket loaders.
Storm Drain Conveyance System
■ Locate reaches of storm drain with deposit problems and develop a flushing schedule that keeps the pi pe clear of excessive buildup.
■ Collect flushed effluent and pump to the sanitary sewer for treatment.
Pump Stations
■ Clean all storm drain pump stations prior to the wet season to remove silt and trash. ■ Do not allow discharge from cleaning a storm drain pump station or other facility to reach the storm drain system.
■ Conduct quarterly routine maintenance at each pump station. ■ Inspect, clean, and repair as necessary all outlet structures prior to the wet season. ■ Sample collected sediments to determine if landfill disposal is possible, or illegal discharges in the watershed are occurring.
Open Channel
■ Consider modification of storm channel characteristics to improve channel hydraulics, to increase pollutant removals, and to enhance channel/ creek aesthetic and habitat value. ■ Conduct channel modification/improvement in accordance with existing laws. Any person, government agency, or public utility proposing an activity that will change the natural (emphasis added) state of any river, stream, or lake in California, must enter into a steam or Lake Alteration Agreement with the Department of Fish and Game. Thedeveloper-applicant should also contact local governments(city, county, special districts), other state agencies 2 of 9 California Stormwater BMP Handbook
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(SWRCB, RWQCB, Department of Forestry, Department of Water Resources), and Federal Corps of Engineers and USFWS
Illicit Connections and Discharges
■ During routine maintenance of conveyance system and drainage structures field staff should look for evidence of illegal discharges or illicit connections:
- Is there evidence of spills such as paints, discoloring, etc. - Are there any odors associated with thedrainagesystem - Record locations of apparent illegal discharges/illicit connections - Track flows back to potential dischargers and conduct aboveground inspections. This can be done through visual inspection of up gradient manholes or alternate techniques including zinc chloride smoke testing, fluorometric dye testi ng, physical inspection testing, or television camera inspection.
- Once the origin of flow is established, require illicit discharger to eliminate the discharge. ■ Stencil storm drains, where applicable, to prevent illegal disposal of pollutants. Storm drain inlets should have messages such as"Dump No Waste Drains to Stream" stenciled next to them to warn against ignorant or intentional dumping of pollutants into the storm drainage system.
■ Refer to fact sheet SC -10 Non-Stormwater Discharges.
Illegal Dumping
■ Regularly inspect and clean up hot spots and other storm drainage areas where illegal dumping and disposal occurs.
■ Establish asystem for tracking incidents. The system should be designed to identify the following:
- Illegal dumping hot spots
- Types and quantities (in some cases) of wastes
- Patterns in time of occurrence (time of day/night, month, or year) - Mode of dumping (abandoned containers, "midnight dumping" from direct dumping of materials, accidents/spills)
- Responsible parties
moving vehicles,
■ Post "No Dumping" signs in problem areas with a phone number for reporting dumping and disposal. Signs should also indicate fines and penalties for illegal dumping. ■ Refer to fact sheet SC -10 Non-Stormwater Discharges.
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SC -74 Drainage System Maintenance
■ The State Department of Fish and Game has a hotline for reporting violations called Cal TIP (1-800-952-5400). The phone number may be used to report any violation of a Fish and Gamecode(illegal dumping, poaching, etc.).
■ The California Department of Toxic Substances Control's Waste Alert Hotline, 1-800- 69TOXI C, can be used to report hazardous waste violations.
Training
■ Train crews in proper maintenance activities, including record keeping and disposal. ■ Only properly trained individuals are allowed to handle hazardous materials/ wastes. ■ Train municipal employees from all departments(publicworks, utilities, street cleaning, parks and recreation, industrial waste inspection, hazardous waste inspection, sewer maintenance) to recognize and report illegal dumping.
■ Train municipal employees and educate businesses, contractors, and the general public in proper and consistent methods for disposal.
■ Train municipal staff regarding non-stormwater discharges (See SC -10 Non-Stormwater Discharges) .
Spill Response and Prevention
■ Refer to SC -11, Prevention, Control & Cleanup
■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly disposeof spill cleanup material.
Other Considerations
■ Cleanup activities may create a slight disturbance for local aquatic species. Access to items and material on private property may be limited. Trade-offs may exist between channel hydraulics and water quality/riparian habitat. If storm channels or basins are recognized as wetlands, many activities, including maintenance, may be subject to regulation and permitting.
■ Storm drain flushing is most effective in small diameter pipes (36 -inch diameter pipe or less, depending on water supply and sediment collection capacity). Other considerations associated with storm drain flushing may include the availability of a water source, finding a downstream area to collect sediments, liquid/sediment disposal, and disposal of flushed effluent to sanitary sewer may be prohibited in some areas. ■ Regulations may include adoption of substantial penalties for illegal dumping and disposal. ■ Municipal codes should include sections prohibiting the discharge of soil, debris, refuse, hazardous wastes, and other pollutants into the storm drain system. ■ Private property access rights may be needed to track illegal discharges up gradient. 4 of 9 California Stormwater BMP Handbook
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Drainage System Maintenance SC -74
■ Requirements of municipal ordinance authority for suspected source verifi cation testing for illicit connections necessary for guaranteed rights of entry.
Requirements
Costs
■ An aggressive catch basin cleaning program could require a significant capital and O&M budget. A careful study of cleaning effectiveness should be undertaken before increased cleaning is implemented. Catch basin cleaning costs are less expensive if vacuum street sweepers are available; cleaning catch basins manually can cost approximately twice as much as cleaning the basi ns with a vacuum attached to a sweeper. ■ Methods used for illicit connection detection (smoke testing, dyetesting, visual inspection, and flow monitoring) can be costly and time-consuming. Site -specific factors, such as the level of impervious area, the density and ages of buildings, and type of land usewill determine the level of investigation necessary. Encouraging reporting of illicit discharges by employees can offset costs by saving expense on inspectors and directing resources more efficiently. Some programs have used funds available from "environmental fees" or special assessment districts to fund their illicit connection elimination programs.
Maintenance
■ Two -person teams may be required to clean catch basins with vactor trucks. ■ Identifying illicit discharges requires teams of at least two people(volunteerscan be used), plus administrative personnel, depending on the complexity of the storm sewer system. ■ Arrangements must be made for proper disposal of collected wastes. ■ Requires technical staff to detect and investigate illegal dumping violations, and to coordinate public education.
Supplemental I nformation
Further Detail of the BMP
Storm Drain flushing
Sanitary sewer flushing is a common maintenance activity used to improve pipe hydraulics and to remove pollutants in sanitary sewer systems. The same pri nci pies that make sanitary sewer flushing effective can be used to flush storm drains. Flushing may be designed to hydraulically convey accumulated material to strategic locations, such as to an open channel, to another point whereflushing will be initiated, or over to the sanitary sewer and on to the treatment facilities, thus preventing re -suspension and overflow of a portion of the solids during storm events.
Flushing prevents"plug flow" discharges of concentrated pollutant loadings and sediments. The deposits can hinder the designed conveyance capacity of the storm drain system and potentially cause backwater conditions in severe cases of clogging.
Storm drain flushing usually takes place along segments of pipe with grades that are too flat to maintain adequate velocity to keep particles in suspension. An upstream manhole is selected to place an inflatabledevicethat temporarily plugs the pipe. Further upstream, water is pumped into the line to create a flushing wave. When the upstream reach of pipe is sufficiently full to January 2003
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cause a flushing wave, the inflated device is rapidly deflated with the assistance of avacuum pump, releasing the backed up water and resulting in the cleaning of the storm drain segment.
To further reduce the impacts of stormwater pollution, a second inflatabledevice, placed well downstream, may be used to re -collect the water after the force of theflushing wave has dissipated. A pump may then be used to transfer the water and accumulated material to the sanitary sewer for treatment. In some cases, an interceptor structure may be more practical or required to re -collect theflushed waters.
It has been found that cleansing efficiency of periodic flush waves is dependent upon flush volume, flush discharge rate, sewer slope, sewer length, sewer flow rate, sewer diameter, and population density. Asa rule of thumb, the length of lineto be flushed should not exceed 700 feet. At this maximum recommended length, the percent removal efficiency ranges between 65- 75 percent for organics and 55-65 percent for dry weather grit/ inorganic material. The percent removal efficiency drops rapidly beyond that. Water is commonly supplied by a water truck, but fire hydrants can also supply water. To make the best use of water, it is recommended that reclaimed water be used or that fire hydrant lineflushing coincide with storm drain flushing.
Flow Management
Flow management has been one of the principal motivations for designing urban stream corridors in the past. Such needs may or may not be compatible with the stormwater quality goals in the stream corridor.
Downstream flood peaks can be suppressed by reducing through flow velocity. This can be accomplished by reducing gradient with grade control structures or increasing roughness with boulders, dense vegetation, or complex banks forms. Reducing velocity correspondingly increases flood height, so all such measures havea natural association with floodplain open space. Flood elevations laterally adjacent to the stream can be lowered by increasing through flow velocity.
However, increasing velocity increases flooding downstream and inherently conflictswith channel stability and human safety. Where topography permits, another way to lower flood elevation is to lower the level of thefloodway with drop structures into a large but subtly excavated bowl where flood flows we allowed to spread out.
Stream Corridor Planning
Urban streams receive and convey stormwater flows from developed or developing watersheds.
Planning of stream corridors thus interacts with urban stormwater management programs. If local programs are intended to control or protect downstream environments by managing flows delivered to the channels, then it is logical that such programs should be supplemented by management of the materials, forms, and uses of the downstream riparian corridor. Any proposal for steam alteration or management should be investigated for its potential flow and stability effects on upstream, downstream, and laterally adjacent areas. The timing and rate of flow from various tributaries can combine in complex ways to alter flood hazards. Each section of channel is unique, influenced by its own distribution of roughness elements, management activities, and stream responses.
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Flexibility to adapt to stream features and behaviors as they evolve must be included in stream reclamation planning. The amenity and ecology of streams may be enhanced through the landscape design options of 1) corridor reservation, 2) bank treatment, 3) geomorphic restoration, and 4) grade control.
Corridor reservation - Reserving stream corridors and valleys to accommodate natural stream meandering, aggradation, degradation, and over bank flows allows streams to find their own form and generate less ongoing erosion. I n California, open stream corridors in recent urban developments have produced recreational open space, irrigation of streamside plantings, and the aesthetic amenity of flowing water.
Bank treatment - The use of armoring, vegetative cover, and flow deflection may be used to influence a channel's form, stability, and biotic habitat. To prevent bank erosion, armoring can be done with rigid construction materials, such as concrete, masonry, wood planks and logs, riprap, and gabions. Concrete linings have been criticized because of their lack of provision of biotic habitat. I n contrast, riprap and gabions make relatively porous and flexible linings.
Boulders, placed in the bed reduce velocity and erosive power.
Riparian vegetation can stabilize the banks of streams that are at or near acondition of equilibrium. Binding networks of roots increase bank shear strength. During flood flows, resilient vegetation is forced into erosion -inhibiting mats. The roughness of vegetation leads to lower velocity, further reducing erosive effects. Structural flow deflection can protect banks from erosion or alter fish habitat. By concentrating flow, a deflector causes a pool to be scoured in the bed.
Geomorphic restoration — Restoration refers to alteration of disturbed streams so their form and behavior emulate those of undisturbed streams. Natural meanders are retained, with grading to gentle slopes on the inside of curves to allow point bars and riffle -pool sequences to develop. Trees are retained to provide scenic quality, biotic productivity, and roots for bank stabilization, supplemented by plantings where necessary.
A restorative approach can be successful where the stream is already approaching equilibrium.
However, if upstream urbanization continues new flow regimes will be generated that could disrupt the equilibrium of thetreated system.
Grade Control - A grade control structure is a level shelf of a permanent material, such as stone, masonry, or concrete, over which stream water flows. A grade control structure is called a sill, weir, or drop structure, depending on the relation of its invert elevation to upstream and downstream channels.
A sill is installed at the preexisting channel bed elevation to prevent upstream migration of nick points. It establishes a firm base level below which the upstream channel can not erode.
A weir or check dam is installed with invert above the preexisting bed elevation. A weir raises the local base level of the stream and causes aggradation upstream. The gradient, velocity, and erosive potential of the stream channel are reduced. A drop structure lowers the downstream invert below its preexisting elevation, reducing downstream gradient and velocity. Weirs and drop structure control erosion by dissipating energy and reducing slope velocity.
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When carefully applied, grade control structures can be highly versatile in establishing human and environmental benefits in stabilized channels. To be successful, application of grade control structures should be guided by analysis of the stream system both upstream and downstream from the area to he reclaimed.
Examples
The California Department of Water Resources began the Urban Stream Restoration Program in 1985. The program provides grant funds to municipalities and community groups to implement stream restoration projects. The projects reduce damages from stream bank aid watershed instability arid floods while restoring streams' aesthetic, recreational, and fish and wildlife values.
I n Buena Vista Park, upper floodway slopes are gentle and grassed to achieve continuity of usable park land across the channel of small boulders at the base of the slopes.
The San Diego River is a large, vegetative lined channel, which was planted in a variety of species to support riparian wildlife while stabilizing the steep banks ofthefloodway.
References and Resources
Ferguson, B.K. 1991. Urban Stream Reclamation, p. 324-322, Journal of Soil and Water Conservation.
Los Angeles County Stormwater Quality. Public Agency Activities Model Program. On-line:
http:// ladpw.org/wmd/ npdes/ public TC.cfm
Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July. 1998
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
San Diego Stormwater Co -perm ittees Juri sdictional Urban Runoff Management Program (URMP) Municipal Activities Model Program Guidance. 2001. Project Clean Water.
November.
United States Environmental Protection Agency (USEPA). 1999. Stormwater Management Fact Sheet Non-stormwater Discharges to Storm Sewers. EPA 832-F-99-022. Office of Water, Washington, D.C. September.
United States Environmental Protection Agency (USEPA). 1999. Stormwater O&M Fact Sheet Catch Basin Cleaning. EPA 832-F-99-011. Office of Water, Washington, D.C. September. 8 of 9 California Stormwater BMP Handbook
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United States Environmental Protection Agency (USEPA). 2002. Pollution Prevention/ Good Housekeeping for Municipal Operations Illegal Dumping Control. On line:
http://www.epa.gov/ npdes/ menuofbmps/ poll 7.htm
United States Environmental Protection Agency (USEPA). 2002. Pollution Prevention/ Good Housekeeping for Municipal Operations Storm Drain System Cleaning. On line:
http://www.epa.gov/npdes/ menuofbmps/ poll 16.htm
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SC -75
Description
It is important to control litter to eliminate trash and other materials in stormwater runoff. Waste reduction is a major component of waste management and should be encouraged
through training and public outreach. Management of waste once it is collected may involve reuse, recycling, or proper disposal.
Approach
Pollution Prevention
• Reuse products when possible.
• Encourage recycling programs with recycling bins, used oil collection, etc.
Suggested Protocols
Solid Waste Collection
• Implement procedures, where applicable, to collect,
transport, and dispose of solid waste at appropriate disposal facilities in accordance with applicablefederal, state, and local laws and regulations.
• Include properly designed trash storage areas. If feasible provide cover over trash storage areas.
• Regularly inspect solid wastecontainersfor structural damage. Repair or repl ace damaged containers as necessary.
Objectives
• Cover
• Contain
• Educate
• Reduce/Reuse
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0 0 0 0 0 0 0 0
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Waste Handling and Disposal
■ Secure solid waste containers; containers must be closed tightly when not in use. ■ Do not fill waste containers with washout water or any other liquid. ■ Ensure that only appropriate solid wastes are added to the solid waste container. Certain wastes such as hazardous wastes, appliances, fluorescent lamps, pesticides, etc. may not be disposed of in solid wastecontainers(seechemical/ hazardous waste collection section below).
■ Do not mix wastes; this can cause chemical reactions, make recycling impossible, and complicate disposal.
■ Refer to SC -34 Waste Handling and Disposal for more information regarding solid waste facilities.
Waste Reduction and Recycling
■ Recycle wastes whenever possible. Many types of waste can be recycled, recycling options for each waste type are limited. All gasoline, antifreeze, waste oil, and lead -acid batteries can be recycled. Latex and oil -based paint can be reused, as well as recycled. M ateri als that cannot be reused or recycled should either be incinerated or disposed of at a properly permitted landfill.
■ Recycling is always preferable to disposal of unwanted materials. ■ Recycling bins for glass, metal, newspaper, plastic bottles and other recyclable household solid wastes should be provided at public facilities and/or for residential curbside collection.
Controlling Litter
■ Post "No Littering" signs and enforce anti -litter laws. ■ Provide litter receptacles in busy, high pedestrian traffic areas of the community, at recreational facilities, and at community events.
■ Clean out and cover litter receptacles frequently to prevent spillage.
Illegal Dumping
Substances illegally dumped on streets and into the storm drain system and creeks include paints, used oil and other automotivefluids, construction debris, chemicals, fresh concrete, leaves, grass clipping, and pet wastes.
■ Post "No Dumping" signs with a phone number for reporting dumping and disposal. Signs should also indicatefines and penaltiesfor illegal dumping. ■ Landscaping and beautification efforts of hot spots might also discourage future dumping. ■ SeeSC-74 Drainage System Maintenance, and SC -10 Non-Stormwater Discharges. 2 of 4 California Stormwater BMP Handbook
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Requirements
Costs
■ The costs for a solid waste source control program vary depending on the type of method.
The cost of a community education program or a plan to increase the number of trash receptacles can be very minimal. Costs for structural controls such as trash racks, bar screens, and silt traps can be quite costly ranging from $250,000 to $900,000. ■ A collection facility or curbside collection for used oil may result in significant costs.
Commercial locations (automobi le service stations, quick oil change centers, etc.) as collection points eliminate hauling and recycling costs. ■ Collection and disposal of hazardous waste can be very expensive and requi res trained operators; laboratory and detection equipment; and extensive record keeping including dates, types, and quantities.
■ Use of volunteer work forces can lower storm drain stenciling program costs. Stenciling kits require procurement of durable/disposable items. The stenciling program can aid in the cataloging of the storm drain system. One municipality from the state of Washington has estimated that stenciling kits cost approximately $50 each. Stencils may cost about $8 each including the die cost on an order of 1,000. Re -orders cost about $1/stencil. Stencil designs may beavailablefrom other communities. Stencil kits should be provided on a loan basis to volunteer groups free of charge with the understanding that kit remnants are to be returned.
Maintenance
■ The primary staff demand for stenciling programs isfor program setup to provide marketing and training. Ongoing/follow-up staff time is minimal because of volunteer services. ■ Staffing requirements are minimal for oil recycling programs if collection/recycling is contracted out to a used oil hauler/ recycler or required at commercial locations. ■ Staff requirennentsfor maintaining good housekeeping BM Ps at waste handling sites is minimal.
Supplemental I nformation
Further Detail of the BMP
Waste Reduction
An approach to reducestormwater pollution from waste handling and disposal isto assess activities and reduce waste generation. The assessment is designed to find situations where waste can be eliminated or reduced and emissions and environmental damage can be minimized. The assessment involves collecting process specific information, setting pollution prevention targets, and developing, screening and selecting waste reduction options for further study. Starting a waste reduction program is economically beneficial because of reduced raw material purchases and lower waste disposal fees.
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References and Resources
Best Management Practices Program for Pollution Prevention, City and County of San Francisco, Uribe& Associates, Oakland, California, 1990.
Harvard University. 2002. Solid Waste Container Best Management Practices— Fact Sheet On - Line Resources— Environmental Health and Safety.
Model Urban Runoff Program: A How -To -Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality Control Board. July 1998. (Revised February 2002 by the California Coastal Commission).
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp introduction.asp.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
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Water & Sewer Utility Maintenance SC -76
Description
Although the operation and maintenance of public utilities are not considered chronic sources of stormwater pollution, some activities and accidents can result in the discharge of pollutants that can pose a threat to both human health and the quality of receiving waters if they enter the storm drain system. Sewage incident response and investigation may involve a coordinated effort between staff from a number of different
departments/agencies. Cities that do not provide maintenance of water and sewer utilities must coordinate with thecontracting agency responsible for theseactivitiesand ensure that these model procedures are followed.
Approach
Pollution Prevention
Inspect potential non-stormwater discharge flow paths and clear/cleanup any debris or pollutants found (i.e. remove trash, leaves, sediment, and wipe up liquids, including oil spills).
Suggested Protocols
Water Line Maintenance and Cleaning
Procedures can be employed to reduce pollutants from
discharges associated with water utility operation and
maintenance activities. Planned discharges may includefire hydrant testing, flushing water supply mains after new
construction, flushing linesdueto complaints of taste and odor, dewatering mainsfor maintenance work. Unplanned discharges from treated, recycled water, raw water, and groundwater systems operation and maintenanceactivitiescan occur from water main Objectives
• Contain
• Educate
• Reduce/Mnirrize
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
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breaks, sheared fire hydrants, equipment malfunction, and operator error.
Planned discharges
■ Identify a suitable discharge option in the following order of preference:
Apply to the land.
Reuse water for dust suppression, irrigation, or construction compaction.
Discharge to a sanitary sewer system with approval.
Discharge to the storm drain system using applicable pollution control measures. (Only available to clean water discharges such as water main/ water storage tank/water hydrant flushing).
■ If water is discharged to a storm drain, control measures must be put in place to control potential pollutants (i.e. sediment, chlorine, etc.). Examples of some storm drain protection options include:
Silt fence— appropriate where the inlet drains relatively flat area.
Gravel and wire mesh sediment filter— Appropriate where concentrated flows are expected.
Wooden weir and fabric— use at curb inlets where a compact installation is desired. ■ Prior to discharge, inspect discharge flow path and clear/cleanup any debris or pollutants found (i.e. remove trash, leaves, sediment, and wipe up liquids, including oil spills). ■ General Design considerations for inlet protection devices include thefollowing:
The device should be constructed such that cleaning and disposal of trapped sediment is made easy, while minimizing interference with discharge activities.
Devices should be constructed so that any standing water resulting from the discharge will not cause excessive inconvenience or flooding/ damage to adjacent land or structures.
■ The effectiveness of control devices must be monitored during the discharge period and any necessary repairs or modifications made.
Unplanned Discharges
■ Stop the discharge as quickly as possible.
■ I nspect flow path of the discharged water:
- Identify erodible areas which may need to be repaired or protected during subsequent repairs or corrective actions
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- Identify the potential for pollutants to be washed into the waterway ■ If repairsor corrective action will cause additi onal discharges of water, select the appropriate procedures for erosion control, chlorine residual, turbidity, and chemical additives. Prevent potential pollutants from entering the flow path.
Sanitary Sewer Maintenance
Applicable tomunicipal itieswho own and operated a sewage collection system. Facilitiesthat are covered under this program include sanitary sewer pipes and pump stations owned and operated by a municipality. The owner of the sanitary sewer facilities is the entity responsible for carrying out this prevention and response program.
■ Clean sewer lines on a regular basis to remove grease, grit, and other debris that may lead to sewer backups.
■ Establish routine maintenance program. Cleaning should be conducted at an established minimum frequency and more frequently for problem areas such as restaurants that are identified
■ Cleaning activities may require removal of tree roots and other identified obstructions. ■ During routine maintenance and inspection note the condition of sanitary sewer structures and identify areas that need repair or maintenance. Items to note may include the following:
- Cracked/deteriorating pipes
- Leaking joints/seals at manhole
- Frequent line plugs
- Line generally flows at or near capacity
- Suspected infiltration or exfiltration.
■ Prioritize repairs based on the nature and severity of the problem. Immediate clearing of blockage or repair is required where an overflow is currently occurring or for urgent problems that may cause an imminent overflow (e.g. pump station failures, sewer line ruptures, sewer line blockages). These repairs may be temporary until scheduled or capital improvements can be completed.
■ Review previous sewer maintenance records to help identify "hot spots" or areas with frequent maintenance problems and locations of potential system failure.
Spills and Overflows
■ Identify and track sanitary sewer discharges. Identify dry weather infiltration and inflow first. Wet weather overflow connections are very difficult to locate.
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■ Locate wet weather overflows and leaking sanitary sewers using conventional source identification techniques such as monitoring and field screening. Techniques used to identify other illicit connection sources can also be used for sewer system evaluation surveys (seeSC74 Drainage System Operation and Maintenance).
■ Implement community awareness programs for monitoring sanitary sewer wet weather overflows. A citizen's hotline for reporting observed overflow conditions should be established to supplement field screening efforts.
■ Establish lead department/agency responsible for spill response and containment. Provide coordination within departments.
■ When a spill, leak, and/or overflow occurs and when disinfecting a sewage contaminated area, take every effort to ensure that the sewage, disinfectant and/or sewage treated with the disinfectant is not discharged to the storm drain system or receiving waters. Methods may include:
Blocking storm drain inlets and catch basins
Containing and diverting sewage and disinfectant away from open channels and other storm drain fixtures (using sandbags, inflatable dams, etc.) Removing the material with vacuum equipment
■ Record required information at the spill site.
■ Perform field tests as necessary to determine the source of the spill. ■ Develop notification procedures regarding spill reporting.
Septic Systems
■ Ensure that homeowners, installers, and inspectors are educated in proper maintenance of septic systems. This may require coordination with staff from other departments. Outreach to homeowners should include inspection reminders informing then that inspection and perhaps maintenance is due for their systems. Recommend that the system be inspected annually and pumped -out regularly.
■ Programswhich seek to addressfailingsepticsystemsshould consider using field screening to pinpoint areas where more detailed onsiteinspection surveys are warranted.
Training
■ Conduct annual training of water utility personnel and service contractors. (field screening, sampling, smoke/dye testing, TV inspection).
■ OSHA -required Health and Safety Training 29 CFR 1910.120 plus annual Refresher Training (as needed).
■ OSHA Confined Space Entry training (Cal -OSHA Confined Space, Title 8 and federal OSHA 29 CFR 1910.146).
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Spill Response and Prevention
■ See previous section regarding spills and overflows.
■ Refer to SC -11, Spill Prevention, Control & Cleanup. ■ Have spill cleanup materials readily available and in aknown location. ■ Cleanup spills immediately and use dry methods if possible. ■ Properly dispose of spill cleanup material.
Other Considerations
■ Enact ordinance granting "right -of -entry" to locate potentially responsible parties for sewer overflows.
■ Reliance on individual onsite inspection to detect failed septic systems can be major limitation. The individual onsite inspection is very labor-intensive and requires access to private property to pinpoint the exact location of the failing system. ■ A significant limitation to correcting failing septic systems is the lack of techniques available for detecting individual failed septic systems.
Requirements
Costs
■ Departmental cooperation recommended for sharing or borrowing staff resources and equipment from municipal wastewater department.
■ Infiltration, inflow, and wet weather overflows from sanitary sewers are very labor and equipment intensive to locate.
■ The costs associated with detecting and correctingsepticsystem failures are subject to number of factors, including availability of trained personnel, cost of materials, and the level of follow-up required to fix the system problems.
Maintenance
■ Minimum 2 -person teams to perform field screening and associated sampling. ■ Larger teams required for implementing other techniques(i.e. zinc chloride smoke testing, fluorometricdyetesting, television camera inspection and physical inspection with confined space entry) to identify sewer system leaks.
■ Program coordination required for handling emergencies, record keeping, etc. ■ Many of the problems associated with improper use of septic systems may be attributed to lack of user knowledge on operation and maintenance. Educational materials for homeowners and training courses for installers and inspectors can reduce the incidence of pollution from these widespread and commonly used pollution control devices.
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Supplemental I nformation
Further Detail of the BMP
Onsite Sewage Disposal Systems
New onsitesewagedisposal systems should bedesigned, located, and installed away from open waterbodi es and sensitive resources such as wetlands and floodplains. A protective separation between the OSDS and groundwater should also be established. OSDSs should be operated and maintained to prevent surface water discharges and reduce pollutant loadings to groundwater.
Inspection of OSDSs should occur regularly and repairs made immediately. New or replacement plumbing fixtures should be of the high efficiency type.
Typical Sanitary Sewer Problems
■ Old and deteriorated main and lateral pipes- Sewers range in age from 30 to 100 years with an average age of 50 years.
■ Cracked sewer pipes- Existing sewers are mostly clay pipes which can crack as they deteriorate with age and also by earth movement.
■ Misaligned and open pipejoints- Most of the mortar used to seal the joints between sections of clay pipe has deteriorated.
■ Undersized sewer pipe -The existing sewer system is overloaded due to new sewer hook- ups, underground water infiltration, and illegal roof and/or yard drain connections. ■ Defective manholes- Old manholes are made of bricks. Typical problems associated with brick manholes are loose bricks, missing bricks, and misaligned manholes. ■ Missing and/or unrecorded sewer pipes and manholes- This problem is typical in the easement/backlinesewer. Sewer pipe locations shown on the sewer record map are different from the actual sewer location.
■ Sewer main under houses and other improvements- Complaints of sewer main alignment crossing the house and other improvements. A solution to this problem requires an agreement with the property owner for a new sewer easement at a relocated line.
Causes of Sanitary Sewer Backups
■ Root infiltration - Tree roots area major cause of backups. ■ Water inflow/infiltration - Rain water entering the sewer pipe causes overflows. ■ Solids -Typical solids that buildup in the pipe and cause backups are grease, dirt, bones, tampons, paper towels, diapers, broken dishware, garbage, concrete, and debris. ■ Structural defects in pipes and manholes- Sags in the line, cracks, holes, protruding laterals, misaligned pipe, offset joints are all possible causes of backups. 6 of 8 California Stormwater BMP Handbook
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Design Considerations
Sanitary sewer overflows can often be reduced or eliminated by a number of practices, in addition to sewer system cleaning and maintenance, including the following:
■ Reducing infiltration and inflow through rehabilitation and repair of broken or leaking sewer lines.
■ Enlarging or upgrading the capacity of sewer lines, pump stations, or sewage treatment plants.
■ Constructing wet weather storage and treatment facilities to treat excess flows. ■ Addressing SSOs during sewer system master planning and facilities planning.
Septic Systems
Two field screening techniques that have been used with success at identifying possible locations of failing septic systems are the brightener test and color infrared (CI R) aerial photography. The first involves the use of specific phosphorus -based elements found in many laundry products, often called brighteners, as an indicator of the presence of failing onsite wastewater systems.
The second technique uses color infrared (CI R) aerial photography to characterize the performance of septic systems. This method has been found to be a quick and cost-effective method for assessing the potential impacts of failing systems and uses variations in vegetative growth or stress patterns over septic system field lines to identify those systems that may potentially be malfunctioning. Then a more detailed onsitevisual and physical inspection will confirm whether the system has truly failed and the extent of the repairs needed. These inspections may be carried out by county health departments or other authorized personnel.
References and Resources
Alameda Countywide Clean Water Program on-line
http://www.ci.berkeley.ca.us/ pw/ Storm/ stormala.html Los Angeles County Stormwater Quality. Public Agency Activities Model Program. On-line:
http:// ladpw.org/wmd/ npdes/ public TC.cfm
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp introduction.asp Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff Management Plan. September 1997, updated October 2000.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 1998. Water Utility Operation and Maintenance Discharge Pollution Prevention Plan. June United States Environmental Protection Agency (USEPA). 2001. Illicit Discharge Detection and Elimination. On-line: http://cfpub.epa.gov/npdes/stormwater/menuofbmps/illi 1.cfm January 2003
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United States Environmental Protection Agency (USEPA). 2001. Pollution Prevention/ Good Housekeeping for Municipal Operators Septic System Controls. On-line:
http://www.epa.gov/ npdes/ menuofbmps/ poll 14.htm
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Infiltration Basin
TC-11
Description
An infiltration basin is a shallow impoundment that is designed to infiltrate stormwater. Infiltration basins use the natural filtering ability of the soil to remove pollutants in stormwater runoff. Infiltration facilities store runoff until it gradually exfiltrates through the soil and eventually into the water table.
This practice has high pollutant removal efficiency and can also help recharge groundwater, thus helping to maintain low flows in stream systems. Infiltration basins can be challenging to apply on many sites, however, because of soils requirements. In addition, some studies have shown relatively high failure rates compared with other management practices.
California Experience
Infiltration basins have a long history of use in California, especially in the Central Valley. Basins located in Fresno were among those initially evaluated in the National Urban Runoff Program and were found to be effective at reducing the volume of runoff, while posing little long-term threat to groundwater quality (EPA, 1983; Schroeder, 1995). Proper siting of these devices is crucial as underscored by the experience of Caltrans in siting two basins in Southern California. The basin with marginal separation from groundwater and soil permeability failed immediately and could never be rehabilitated.
Advantages
■ Provides 100% reduction in the load discharged to surface waters.
• The principal benefit of infiltration basins is the
approximation of pre -development hydrology during which a Design Considerations
• Soil for Infiltration
• Slope
• Aesthetics
Targeted Constituents
© Sediment
Q Nutrients
O Trash
Q Metals
® Bacteria
Q Oil and Grease
O Organics
Legend (Removal Effectiveness)
• Low
A Medium
• High
■
■
i
■
■
■
■
CALFORNIA •.: TR,RI ATER
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significant portion of the average annual rainfall runoff is infiltrated and evaporated rather than flushed directly to creeks.
• If the water quality volume is adequately sized, infiltration basins can be useful for providing control of channel forming (erosion) and high frequency (generally less than the 2 -year) flood events.
Limitations
• May not be appropriate for industrial sites or locations where spills may occur. • Infiltration basins require a minimum soil infiltration rate of o.5 inches/hour, not appropriate at sites with Hydrologic Soil Types C and D. • If infiltration rates exceed 2.4 inches/hour, then the runoff should be fully treated prior to infiltration to protect groundwater quality.
• Not suitable on fill sites or steep slopes.
• Risk of groundwater contamination in very coarse soils. • Upstream drainage area must be completely stabilized before construction. • Difficult to restore functioning of infiltration basins once clogged.
Design and Sizing Guidelines
• Water quality volume determined by local requirements or sized so that 85% of the annual runoff volume is captured.
• Basin sized so that the entire water quality volume is infiltrated within 48 hours. • Vegetation establishment on the basin floor may help reduce the clogging rate.
Construction/Inspection Considerations
• Before construction begins, stabilize the entire area draining to the facility. If impossible, place a diversion berm around the perimeter of the infiltration site to prevent sediment entrance during construction or remove the top 2 inches of soil after the site is stabililized.
Stabilize the entire contributing drainage area, including the side slopes, before allowing any runoff to enter once construction is complete.
• Place excavated material such that it can not be washed back into the basin if a storm occurs during construction of the facility.
• Build the basin without driving heavy equipment over the infiltration surface. Any equipment driven on the surface should have extra -wide ("low pressure") tires. Prior to any construction, rope off the infiltration area to stop entrance by unwanted equipment. • After final grading, till the infiltration surface deeply. • Use appropriate erosion control seed mix for the specific project and location. 2 of 8 California Stormwater BMP Handbook
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Performance
As water migrates through porous soil and rock, pollutant attenuation mechanisms include precipitation, sorption, physical filtration, and bacterial degradation. If functioning properly, this approach is presumed to have high removal efficiencies for particulate pollutants and moderate removal of soluble pollutants. Actual pollutant removal in the subsurface would be expected to vary depending upon site -specific soil types. This technology eliminates discharge to surface waters except for the very largest storms; consequently, complete removal of all stormwater constituents can be assumed.
There remain some concerns about the potential for groundwater contamination despite the findings of the NURP and Nightingale (1975; 1987a,b,c; 1989). For instance, a report by Pitt et al. (1994) highlighted the potential for groundwater contamination from intentional and unintentional stormwater infiltration. That report recommends that infiltration facilities not be sited in areas where high concentrations are present or where there is a potential for spills of toxic material_ Conversely, Schroeder (1995) reported that there was no evidence of groundwater impacts from an infiltration basin serving a large industrial catchment in Fresno, CA.
Siting Criteria
The key element in siting infiltration basins is identifying sites with appropriate soil and hydrogeologic properties, which is critical for long term performance. In one study conducted in Prince George's County, Maryland (Galli, 1992), all of the infiltration basins investigated clogged within 2 years. It is believed that these failures were for the most part due to allowing infiltration at sites with rates of less than O.5 in/hr, basing siting on soil type rather than field infiltration tests, and poor construction practices that resulted in soil compaction of the basin invert.
A study of 23 infiltration basins in the Pacific Northwest showed better long-ternn performance in an area with highly permeable soils (Hilding, 1996). In this study, few of the infiltration basins had failed after 10 years. Consequently, the following guidelines for identifying appropriate soil and subsurface conditions should be rigorously adhered to. • Determine soil type (consider RCS soil type `A, B or C' only) from mapping and consult USDA soil survey tables to review other parameters such as the amount of silt and clay, presence of a restrictive layer or seasonal high water table, and estimated permeability_ The soil should not have more than 30% clay or more than 40% of clay and silt combined.
Eliminate sites that are clearly unsuitable for infiltration. ■ Groundwater separation should be at least 3 m from the basin invert to the measured ground water elevation. There is concern at the state and regional levels of the impact on groundwater quality from infiltrated runoff, especially when the separation between groundwater and the surface is small.
■ Location away from buildings, slopes and highway pavement (greater than 6 m) and wells and bridge structures (greater than 3o in). Sites constructed of fill, having a base flow or with a slope greater than 15% should not be considered. ■ Ensure that adequate head is available to operate flow splitter structures (to allow the basin to be offline) without ponding in the splitter structure or creating backwater upstream of the splitter.
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• Base flow should not be present in the tributary watershed.
Secondary Screening Based on Site Geotechnical Investigation • At least three in -hole conductivity tests shall be performed using USBR 7300-89 or Bouwer- Rice procedures (the latter if groundwater is encountered within the boring), two tests at different locations within the proposed basin and the third down gradient by no more than approximately 10 m. The tests shall measure permeability in the side slopes and the bed within a depth of 3 m of the invert.
• The minimum acceptable hydraulic conductivity as measured in any of the three required test holes is 13 mm/hr. If any test hole shows less than the minimum value, the site should be disqualified from further consideration.
• Exclude from consideration sites constructed in fill or partially in fill unless no silts or clays are present in the soil boring. Fill tends to be compacted, with clays in a dispersed rather than flocculated state, greatly reducing permeability.
• The geotechnical investigation should be such that a good understanding is gained as to how the stormwater runoff will move in the soil (horizontally or vertically) and if there are any geological conditions that could inhibit the movement of water.
Additional Design Guidelines
(i) Basin Sizing - The required water quality volume is determined by local regulations or sufficient to capture 85% of the annual runoff.
(2) Provide pretreatment if sediment loading is a maintenance concern for the basin. (3) Include energy dissipation in the inlet design for the basins. Avoid designs that include a permanent pool to reduce opportunity for standing water and associated vector problems.
(4)
(5)
Basin invert area should be determined by the equation:
A_WQV
kt
where A = Basin invert area (m2)
WQV = water quality volume (m3)
k = 0.5 times the lowest field -measured hydraulic conductivity (m/hr)
t = drawdown time (48 hr)
The use of vertical piping, either for distribution or infiltration enhancement shall not be allowed to avoid device classification as a Class V injection well per 40 CFR146.5(e)(4).
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Maintenance
Regular maintenance is critical to the successful operation of infiltration basins. Recommended operation and maintenance guidelines include:
■ Inspections and maintenance to ensure that water infiltrates into the subsurface completely (recommended infiltration rate of 72 hours or less) and that vegetation is carefully managed to prevent creating mosquito and other vector habitats. ■ Observe drain time for the design storm after completion or modification of the facility to confirm that the desired drain time has been obtained.
■ Schedule semiannual inspections for beginning and end of the wet season to identify potential problems such as erosion of the basin side slopes and invert, standing water, trash and debris, and sediment accumulation.
■ Remove accumulated trash and debris in the basin at the start and end of the wet season. • Inspect for standing water at the end of the wet season. ■ Trim vegetation at the beginning and end of the wet season to prevent establishment of woody vegetation and for aesthetic and vector reasons.
• Remove accumulated sediment and regrade when the accumulated sediment volume exceeds io% of the basin.
• If erosion is occurring within the basin, revegetate immediately and stabilize with an erosion control mulch or mat until vegetation cover is established. • To avoid reversing soil development, scarification or other disturbance should only be performed when there are actual signs of clogging, rather than on a routine basis. Always remove deposited sediments before scarification, and use a hand -guided rotary tiller, if possible, or a disc harrow pulled by a very light tractor.
Cost
Infiltration basins are relatively cost-effective practices because little infrastructure is needed when constructing them.One study estimated the total construction cost at about $ 2 per ft (adjusted for inflation) of storage far a 0.25 -acre basin (SV4'RPC, 1991). As with other BMPs, these published cost estimates may deviate greatly from what might be incurred at a specific site. For instance, Caltrans spent about $18/ft3 for the two infiltration basins constructed in southern California, each of which had a water quality volume of about 0.34 ac. -ft. Much of the higher cost can be attributed to changes in the storm drain system necessary to route the runoff to the basin locations.
Infiltration basins typically consume about 2 to 3% of the site draining to them, which is relatively small. Additional space may be required for buffer, landscaping, access road, and fencing. Maintenance costs are estimated at 5 to io% of construction costs.
One cost concern associated with infiltration practices is the maintenance burden and longevity.
If improperly maintained, infiltration basins have a high failure rate. Thus, it may be necessary to replace the basin with a different technology after a relatively short period of time.
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References and Sources of Additional Information
Caltrans, 2002, BMP Retrofit Pilot Program Proposed Final Report, Rpt. CTSIAT-RT-o1-050, California Dept. of Transportation, Sacramento, CA.
Galli, J. 1992. Analysis of Urban BMP Performance and Longevity in Prince George's County, Maryland. Metropolitan Washington Council of Governments, Washington, DC.
Hilding, K. 1996. Longevity of infiltration basins assessed in Puget Sound. Watershed Protection Techniques 1(3):124-125.
Maryland Department of the Environment (MDE). 2000. Maryland Stormwater Design Manual. http://www.mde.state.md.us/environment/wma/storinwatermanual . Accessed May 22, 2002.
Metzger, M. E_, D. F. Messer, C. L. Beitia, C. M. Myers, and V. L. Kramer. 2002. The Dark Side Of Stormwater Runoff Management: Disease Vectors Associated With Structural BMPs.
Stormwater 3(2): 24-39.
Nightingale, H.I., 1975, "Lead, Zinc, and Copper in Soils of Urban Storm -Runoff Retention Basins," American Water Works Assoc. Journal. Vol. 67, p. 443 -446 - Nightingale, H.I., 1987a, "Water Quality beneath Urban Runoff Water Management Basins," Water Resources Bulletin, Vol. 23, p. 197-205.
Nightingale, H.I., 1987b, "Accumulation of As, Ni, Cu, and Pb in Retention and Recharge Basin Soils from Urban Runoff," Water Resources Bulletin, Vol. 23, p. 663-672.
Nightingale, H.I., 1987c, "Organic Pollutants in Soils of Retention/Recharge Basins Receiving Urban Runoff Water," Soil Science Vol. 148, pp. 39 -45 - Nightingale, H.I., Harrison, D., and Salo, J.E., 1985, "An Evaluation Technique for Ground- water Quality Beneath Urban Runoff Retention and Percolation Basins," Ground Water Monitoring Review, Vol. 5, No. 1, pp. 43-50.
Oberts, G. 1994. Performance of Stormwater Ponds and Wetlands in Winter. Watershed Protection Techniques 1(2): 64-68.
Pitt, R., et al. 1994, Potential Groundwater Contamination from Intentional and Nonintentional Stormwater Infiltration, EPA/600/R-94/051, Risk Reduction Engineering Laboratory, U.S. EPA, Cincinnati, OH.
Schueler, T. 1987. Controlling Urban Runoff- A Practical Manual for Planning and Designing Urban BMPs. Metropolitan Washington Council of Governments, Washington, DC.
Schroeder, R.A, 1995, Potential For Chemical Transport Beneath a Storm -Runoff Recharge (Retention) Basin for an Industrial Catchment in Fresno, CA, USGS Water -Resource Investigations Report 93-4140.
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Southeastern Wisconsin Regional Nanning Commission (SWRPC). 1991. Costs of Urban Nonpoint Source Water Pollution Control Measures. Southeastern Wisconsin Regional Planning Commission, Waukesha, WI.
U.S. EPA, 1983, Results of the Nationwide Urban Runoff Program_ Volume 1 — Final Report, WH-554, Water Planning Division, Washington, DC.
Watershed Management Institute (WMI). 1997. Operation, Maintenance, and Management of Stormwater Management Systems. Prepared for U.S. Environmental Protection Agency Office of Water, Washington, DC.
Information Resources
Center for Watershed Protection (CWP). 1997. Stormwater BMP Design Supplement for Cold Climates. Prepared for U.S. Environmental Protection Agency Office of Wetlands, Oceans and Watersheds. Washington, DC.
Ferguson, B.K., 1994. Stormwater Infiltration. CRC Press, Ann Arbor, MI.
USEPA. 1993. Guidance to Speck Management Measures for Sources of Nonpoint Pollution in Coastal Waters. EPA -840-B-92-002. U.S. Environmental Protection Agency, Office of Water, Washington, DC.
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Infiltration Basin
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PROFILE
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PREVENTING MOSQUITOES
Guidelines to Reduce and Eliminate
Mosquito Breeding Sites in the Coachella Valle
11- 845
PREVENTING MOSQUITOES
Guidelines to Reduce and Eliminate Mosquito Breeding Sites in the Coachella Valley
INTRODUCTION 1
Why Should You Care about Preventing Mosquitoes? 2
Basic Mosquito Biology 3
Standing Water Mosquitoes 4
Flood Water Mosquitoes 5
MOSQUITO REDUCTION
BEST MANAGEMENT PRACTICES (BMPs) 7
Universally Applicable Mosquito Control BMPs 8
Residential Properties 9
Tire Storage 12
Pastures and Agricultural Properties 13
Ditches and Drains 13
Irrigated Pastures 14
Wetlands 15
Storm Water Management and Infrastructures 18
ABATEMENT AND HEALTH AND SAFETY CODE 20
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
INTRODUCTION
Controlling mosquitoes is critical to maintaining both a high quality of life and protecting people from mosquito -transmitted (vectored) diseases such as West Nile virus (WNV). These guidelines provide property owners and managers of homeowner associations (HOAs), country clubs, golf courses, and agricultural land with Best Management Practices for mosquito reduction. By implementing the following best practices property owners and managers can:
• Reduce mosquito production from permanent water sources • Reduce or eliminate mosquito production from temporary water sources
• Reduce the potential for disease transmission to humans.
These guidelines are based on the California Department of Public Health (CDPH)/Mosquito and Vector Control Association of California (MVCAC) Best Management Practices guide and are intended to assist property owners and managers. The recommended practices, when properly implemented, are in line with best practices for water conservation and can lead to reductions in water usage and cost, while increasing the efficacy of biological and chemical control measures for mosquitoes.
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Coachella Valley Mosquito and Vector Control District
WHY SHOULD YOU CARE
ABOUT PREVENTING MOSQUITOES?
MOSQUITOES VECTOR DISEASE
About 12 mosquito species have been detected in the Coachella Valley. Two of those species currently are vectors (or transmitters) of disease agents to humans within the Coachella Valley. The Encephalitis Mosquito (Culex tarsalis) has been known to transmit West Nile virus, western equine encephalomyelitis, and St. Louis encephalitis. The Southern House Mosquito (Culex quinquefasciatus) can transmit West Nile virus and St. Louis encephalitis. These diseases can have permanent impacts on the nervous system and in rare cases lead to death. The only method to prevent contracting these diseases is to prevent being bitten by mosquitoes. An invasive mosquito species, Aedes aegypti, has also been detected in the Coachella Valley.
This mosquito species is capable of transmitting dangerous viruses, such as dengue, chikungunya, and Zika, however, currently there is no local mosquito transmission of these viruses.
MOSQUITOES ARE A NUISANCE THAT WE CAN REDUCE
Immature mosquitoes live in standing water. We can reduce mosquito populations by reducing the amount of standing water present in the Coachella Valley.
MOSQUITO PREVENTION IS THE LAW
Under the California Health and Safety Code, mosquito and vector control districts may legally abate a public nuisance defined as "Any water that is a breeding place for vectors" and "Any activity that supports the development, attraction, or harborage of vectors, or that facilitates the introduction or spread of vectors" (HSC §2002(j)).
Abatement can result in civil penalties of up to $1000 per day (HSC §2085(a), §2061). 11-848
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
BASIC MOSQUITO BIOLOGY
Mosquitoes have aquatic stages (larva and pupa) and an aerial stage (adult). Mosquito larvae breathe air from above the water surface and most hang at an angle from or lay parallel with the surface of the water while consuming small bits of organic matter. When disturbed, larvae swim down into the water column in a serpentine motion (giving rise to their common names of wigglers and wrigglers).
Mosquitoes then go through a non -feeding stage called a pupa. The easily identified comma -shaped pupae hang from the water surface and move down through the water column in a rolling or tumbling motion when disturbed. This life stage typically lasts about a day, with the mosquito emerging from the back of the pupal case (above the water) as a flying adult mosquito.
All adult mosquitoes feed on plant nectar; however blood is essential for female mosquitoes to produce eggs. To take a blood meal, the female's mouth parts pierce the skin, inject saliva, and suck blood out.
It is through the injection of saliva that a mosquito causes the typical itchy bump and can infect a person or domestic animal with a disease causing organism. Depending on an individual's immune response, even a single bite can be a significant nuisance.
Typically, mosquitoes in the Coachella Valley are divided into standing water species and floodwater species.
THE MOSQUITO LIFE CYCLE
'‘41
Adult
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3 Coachella Valley Mosquito and Vector Control District
STANDING WATER MOSQUITOES
Culex tarsalis
Culex quinquefasciatus
Standing water species are found in areas where water is allowed to pool and stagnate. Adult mosquitoes lay eggs on the water surface.
The eggs float for a few hours to a few days until the larvae hatch in the water. These species can develop in containers, neglected swimming pools, catch basins, open ditches, retention/detention ponds, natural or constructed wetlands, storm water management devices, and along the edges of flowing streams.
The Encephalitis Mosquito (Culex tarsalis) can transmit encephalitis viruses, such as West Nile virus, to humans. It can be found throughout the Coachella Valley. Immature mosquitoes develop in wetlands, duck clubs, irrigated crop fields, and neglected pools. The adult mosquito prefers to feed on birds and mammals. It is most active during spring, summer, and fall.
The Southern House Mosquito (Culex quinquefasciatus) is a secondary vector of West Nile virus and St. Louis encephalitis. It is common throughout the Coachella Valley. Immature mosquitoes often develop in foul water sources such as wastewater lagoons, storm water drains, neglected pools, and other containers. It prefers to feed on birds but will readily feed on humans. This mosquito is most active during the spring, summer, and fall.
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
FLOODWATER MOSQUITOES
Psorophora columbiae
Aedes vexans
Floodwater mosquitoes lay eggs on mud or previously submerged vegetation. The eggs can hatch when the area becomes flooded with water, or they may remain dormant for days to years until the right conditions are available. Floodwater mosquito development sites include irrigated pastures and seasonally flooded duck clubs. These intermittent or seasonally flooded habitats can be among the most productive sources of mosquitoes because they are often free of natural predators.
Psorophora columbiae is a severe outdoor pest in rural areas of the Coachella Valley. The primary sources of these mosquitoes are flood irrigated agricultural fields and pastures. It is present from early summer to late fall. This mosquito prefers to feed on large mammals, including humans, and will bite both day and night with a peak of activity at sunrise and sunset. It can complete development from egg to adult within 3 to 5 days during the extreme temperatures of summer, which makes control of this species very difficult.
The Inland Floodwater Mosquito (Aedes vexans) is a secondary vector of dog heartworm and is a severe outdoor pest. It is common in irrigated pastures and in woodland water course pools. The adults feed mainly on mammals. This mosquito is most active in early spring through late fall. They typically bite at dawn and dusk but can also be active during the day.
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
MOSQUITO REDUCTION
BEST MANAGEMENT PRACTICES (BMPs)
The Coachella Valley Mosquito and Vector Control District (District) uses an Integrated Vector Management (IVM) approach to mosquito and vector control. The IVM approach focuses on site -specific, scientifically sound decisions to target the solution to the problem at hand. Typically, the techniques for controlling vectors are grouped into the following categories:
1. SOURCE REDUCTION OR PHYSICAL CONTROL manipulating the habitat to reduce mosquito breeding sites
2. CULTURAL CONTROL changing the behavior of people so that their actions prevent the development of mosquitoes or the transmission of vector -borne diseases
3. BIOLOGICAL CONTROL adding an animal to the environment that will eat the mosquitoes, for example, adding mosquitofish to a golf course pond
4. CHEMICAL CONTROL using larvicides (materials designed to kill immature larval mosquitoes) and adulticides (materials that kill adult mosquitoes)
Every site is unique. After evaluating the source of the mosquitoes, we implement the mosquito control practices applicable to the circumstances. We encourage property owners and managers to also use appropriate best practices as an efficient and effective way to help prevent a mosquito problem. Fortunately, many of the steps in these guidelines are affordable and easy to implement.
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Coachella Valley Mosquito and Vector Control District
UNIVERSALLY APPLICABLE MOSQUITO
CONTROL BMPs
GENERAL PRINCIPLES
1. Prevent or eliminate unnecessary standing water that remains for more than 96 hours.
2. Maintain water features such as ponds and fountains to circulate water with pumps that run at least eight hours a day. If the feature has no pump, water should be changed every 96 hours to prevent mosquito breeding and/or pesticide treatment may be necessary.
3. Maintain irrigation systems to avoid excess water use and runoff into storm drains.
4. Apply an EPA -registered mosquito repellent when outdoors; especially around dusk and dawn when mosquitoes are
most active.
5. Wear loose -fitting protective clothing including long sleeves and pant legs.
6. Install and properly maintain fine mesh screens on windows and doors to prevent mosquito entry into homes.
7. Contact the District for technical guidance or assistance to prevent a mosquito problem on your property.
8. Maintain access for District staff to monitor and treat mosquito breeding sources.
9. Train and inform homeowners and landscape and maintenance staff about Best Management Practices and personal protective measures such as irrigation and landscape maintenance to reduce mosquito breeding potential of sites commonly found in urban environments.
COLLABORATE WITH LOCAL MOSQUITO
CONTROL PROGRAM
1. Contact the District to evaluate your property for mosquito breeding sites to prevent a mosquito problem on your property.
2. Ensure mosquito control technicians are able to easily access and treat mosquito breeding sites.
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
RESIDENTIAL PROPERTIES
Urban and suburban mosquito sources are especially problematic because they produce mosquitoes in areas of high population density where many people live and work. This can quickly lead to mosquito — borne disease transmission since mosquitoes and humans are often in close proximity. Follow these guidelines to reduce the chances of people getting sick in your community.
PROPERTY MAINTENANCE — Eliminate man-made mosquito breeding sites and harborage:
1. Examine outdoor areas and drain temporary and unnecessary water that may stand longer than 96 hours.
2. Be aware of containers and objects that are subject to collecting water including pet dishes, potted plant drip trays, boats, birdbaths, and tires and buckets. Change water at least once per week. Mosquitoes can develop in as little as a 1/8" of standing water. Dispose of unwanted or unused artificial containers.
3. If possible, drill drainage holes, cover, or invert any container or object, that holds standing water and must remain outdoors. Be sure to check for containers or trash in places that may be hard to see, such as under bushes or buildings.
4. Ensure regular chlorination of swimming pools and that pumps and filters are operating. Unused or unwanted pools should be kept empty and dry. If a pool or spa is not going to be operational for any reason, notify the District so that the pool or spa can be inspected regularly and treated with an appropriate larvicide and/or stocked with mosquitofish, if needed. These services are provided at no additional charge and are supported by property taxes.
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9 Coachella Valley Mosquito and Vector Control District
5. Properly dispose of any old tires that may collect water.
6. Clean clogged rain gutters and storm drains. Keep outdoor drains flowing freely and clear of leaves, vegetation, and other debris.
7. Use waterfalls, fountains, aerators and/or mosquitofish in ponds and ornamental water features. Mosquitofish are provided by the District at no charge. For ponds and ornamental water features where mosquitofish cannot be used, landowners should contact the District.
8. Minimize sites mosquitoes can use for refuge (harborage) by thinning branches, trimming and pruning ornamental shrubs and bushes, and keeping grass mowed short.
9. Install screens on small drains and keep them free of water and debris.
10. Back -fill tire ruts or other low areas that hold water for more than 96 hours.
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10 (760) 342-8287
Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites IRRIGATION AND DRAINAGE — Prevent mosquito breeding associated with poorly managed irrigation, drainage, and landscape features:
1. Manage sprinkler and irrigation systems to minimize runoff entering storm water infrastructure. Ensure appropriate sprinkler type and placement for the landscaping, e.g., Variable Arc Nozzle (VAN) sprinklers for small or odd -shaped lawns (should be placed at least 6 inches from sidewalks and streets), drip sprinklers should be used for flowerbeds or desert landscapes to prevent "watering" the streets and sidewalks. Reduce watering time and increase frequency to grass, plants, and trees to provide sufficient time to absorb the water without waste.
2. Routinely inspect, maintain, and repair irrigation system components.
3. All underground drain pipes should be laid to grade to avoid low areas that may hold water for longer than 96 hours.
4. Improve drainage channels and grading to minimize potential for standing water.
5. Keep ditches clean and well -maintained. Periodically remove accumulated sediment and vegetation. Maintain ditch grade and prevent areas of standing water.
6. Vegetation should be controlled regularly to prevent overgrowth of emergent vegetation and vegetative barriers for District access.
This includes vegetation control to maintain access to lanes and paths, interior pond embankments, and any weed growth that might become established within the pond. Vegetation in water features provides a protected spot for mosquitoes to lay their eggs.
7. Check and repair leaky outdoor faucets.
8. Construct or improve large ditches to a slope of at least 2:1 and a minimum 4 -foot wide bottom. Consider a 3:1 slope or greater to discourage burrowing animal damage, potential seepage problems, and prevent unwanted vegetation growth.
9. Design irrigation systems to use water efficiently and drain completely to avoid standing water. Prevent wet areas associated with seepage by repairing leaks in dams, ditches, and drains.
10. Use desert landscape/xeriscape to reduce water usage and wastage. Install curb set -backs to maintain space between turfgrass and the street; these can include placing rocks, a sidewalk or sections of desert landscaping adjacent to the street to minimize the risk of water runoff into the street.
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www.cvmvcd.org
Coachella Valley Mosquito and Vector Control District
TIRE STORAGE
Old tires can quickly become an area for mosquitoes to breed. These storage and inspection techniques will make it easy to control the mosquitoes.
1. Never allow water to accumulate in tires. Tires should be stored in a covered location or covered by a tarp in order to prevent the accumulation of water from rain or sprinklers. If water does accumulate, it should be dumped immediately.
2. Tires should never be stored in a pile. Tires should be stored on racks or in a stack not more than two rows wide — this allows for inspections of each tire.
3. Waste tires should be picked up by the proper disposal entity on a regular basis.
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12 (760) 342-8287
Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
PASTURES AND
AGRICULTURAL PROPERTIES
Most floodwater mosquitoes develop on pasture and agricultural land in the Coachella Valley. Floodwater mosquitoes can become a severe nuisance in the surrounding community (see Basic Mosquito Biology).
DITCHES AND DRAINS
1. Construct or improve ditches with at least 2:1 slopes and a minimum 4 foot bottom. Consider a 3:1 slope or greater to discourage burrowing animal damage, potential seepage
problems, and prevent unwanted vegetation growth.
2. Keep ditches clean and well -maintained. Periodically remove accumulated sediment and vegetation. Maintain ditch grade to prevent areas of standing water.
3. Design irrigation systems to use water efficiently and drain completely to avoid standing water.
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www.cvmvcd.org 13
Coachella Valley Mosquito and Vector Control District
IRRIGATED PASTURES
1. Grade field to achieve efficient use of irrigation water. Use Natural Resources Conservation Service (NRCS) guidelines for irrigated pastures. Initial laser leveling and periodic maintenance to repair damaged areas are needed to maintain efficient water flow.
2. Irrigate only as frequently as is needed to maintain proper soil moisture. Check soil moisture regularly until you know how your pasture behaves.
3. Do not over fertilize. Excess fertilizers can leach into irrigation tail water, making mosquito production more likely in ditches or further downstream.
4. Apply only enough water to wet the soil to the depth of rooting.
5. Drain excess water from the pasture within 24 hours following each irrigation period. This prevents scalding and reduces the number of weeds in the pasture. Good check slopes are needed to achieve drainage, and a drainage ditch may be used to remove water from the lower end of the field.
6. Inspect fields for drainage and broken checks to see whether re -leveling or reconstruction of levees is needed. Small low areas that hold water can be filled and replanted by hand.
Broken checks create cross -leakage that provide habitat for mosquitoes.
7. Keep animals off the pasture while the soil is soft. An ideal mosquito habitat is created in irrigated pastures when water collects in hoof prints of livestock that were run on wet fields or left in the field during irrigation. Keeping animals off wet fields until soils stiffen also protects the roots of the forage crop and prevents soil compaction that interferes with plant growth.
8. Break up pastures into a number of smaller fields so that the animals can be rotated from one field to another. This allows fields to dry between irrigations and provides a sufficient growth period between grazing periods. It also prevents hoof damage, increases production from irrigated pastures, and helps improve water penetration into the soil by promoting a better root system.
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14 (760) 342-8287
Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
WETLANDS
Managed wetlands are found across California. Each wetland may vary in habitat, water quality, and its management goals. Wetlands in the Coachella Valley include permanent wetlands for habitat or species conservation, manmade waste water treatment wetlands, and temporarily flooded duck clubs.
DESIGN AND MAINTENANCE — General Guiding Principles to Minimize Mosquitoes:
1. Identify problem locations for mosquito production with the District and work to implement mosquito BMPs. Consult with the District on the design of restoration and enhancement projects that have the possibility of effecting mosquito production or control operations.
2. Maintain all open ditches — regularly remove trash, silt, and vegetation to maintain efficient water delivery and drainage.
3. Ensure mosquito control technicians are able to easily access and treat mosquito breeding sites. Make shorelines of natural, agricultural, and constructed water bodies accessible to maintenance and vector control crews for periodic maintenance, control, and removal of emergent vegetation.
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www.cvmvcd.org 15
Coachella Valley Mosquito and Vector Control District
4. Inspect, repair, and clean water control structures of debris.
Remove silt and vegetation build-up in front of structures that impedes drainage or water flow. Completely close, board or mud - up controls to prevent unnecessary water flow, except where water circulation is necessary.
5. Construct, improve, or maintain ditches with 2:1 slopes and a minimum 4 foot bottom. Consider a 3:1 slope or greater to discourage burrowing animal damage, potential seepage problems, and prevent unwanted vegetation growth.
6. Construct, or improve, or maintain levees to quality standard that ensures stability and prevents unwanted seepage. Ideally build levees with >3:1 slopes & >80% compaction; consider >5:1 slope or greater in areas prone to over -land flooding and levee erosion.
7. Inspect and repair levees at least annually.
8. Design managed wetland projects to include independent inlets and outlets for each wetland unit.
9. Excavate deep channels or basins to maintain permanent water areas (> 2.5 feet deep) within a portion of seasonal managed wetlands. This provides year-round habitat for mosquito predators which can inoculate seasonal wetlands when they are irrigated or flooded.
10. Provide nesting and roosting sites for birds and bats. They can feed on adult mosquitoes to help reduce the population.
11. Whenever possible, maintain wetlands at depths greater than 4 feet (1.2 m) to limit the spread of invasive emergent vegetation such as cattails and bulrush.
16 h / (760) 342-8287
Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites MANAGE VEGETATION — Keep the wetland productive and to make mosquito treatments easy:
1. Control floating vegetation conducive to mosquito production.
2. Perform routine maintenance to reduce emergent plant densities to allow mosquito predators (e.g., fish) to move throughout vegetated areas, and to allow good penetration of chemical control agents.
WATER MANAGEMENT — To help reduce mosquitoes:
1. Minimize fluctuations in water level to prevent large areas of intermittently flooded substrate or isolated pools from being created, particularly during mosquito season.
2. Flood managed wetlands with water sources containing mosquitofish or invertebrate predators. Water from permanent ponds can be used to passively introduce mosquito predators.
3. Delay early fall flooding to avoid increased late -season mosquito production. Implement additional BMPs for managed wetlands that need to be flooded earlier than recommended in the fall.
The wetlands targeted for early fall flooding should not be near urban centers and should not have a history of heavy mosquito production.
4. Flood managed wetlands as fast as possible. Coordinate flooding with neighbors or water district to maximize flood -up rate.
5. Encourage water circulation by providing a constant flow of water equal to discharge at drain structure.
6. Flood managed wetland as deep as possible at initial flood -up (18-24").
7. Stock managed wetlands, especially brood ponds or permanent wetlands, with mosquitofish, or encourage habitat for naturalized populations.
8. Where feasible, have an emergency plan that provides for immediate drainage into acceptable areas if a public health emergency occurs.
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Coachella Valley Mosquito and Vector Control District
STORM WATER MANAGEMENT
AND INFRASTRUCTURES
The size and variability of storm water infrastructure, inconsistent quantity and timing of water flows, and tendency to carry and accumulate sediment, trash, and debris, make these systems highly conducive to holding areas of standing water ideal for production of mosquitoes.
1. Consider mosquito production during the design, construction, and maintenance of storm water infrastructure. Design and maintain systems to fully discharge captured water in 96 hours or less. Include access for maintenance in system design.
2. Design outfalls (discharge points) to prevent scour depressions that can hold standing water.
3. Design structures so that they do not hold standing water for more than 96 hours to prevent mosquito development. Features to prevent or reduce the possibility of clogged discharge orifices (e.g., debris screens, permeable pavers) should be incorporated into the design.
4. Design distribution pumping and containment basins with adequate slopes to drain fully. The design slope should take into consideration buildup of sediment between maintenance periods.
5. Inspect drains regularly for the presence of standing water or immature mosquitoes.
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Preventing Mosquitoes: Guidelines to Reduce and Eliminate Mosquito Breeding Sites
6. Provide proper grades along conveyance structures to ensure that water flows freely.
7. Provide a uniform grade between the inlets and outlets to ensure that all water is discharged in 96 hours or less. Routine inspection and maintenance are crucial to ensuring the grade remains as designed and to remove accumulations of sediment, trash, and debris.
8. Keep inlets free of accumulations of sediment, trash, and debris to prevent standing water from backing up on roadways and gutters.
9. Avoid the use of electric pumps. They are subject to failure and often require permanent -water sumps. Structures that do not require pumping should be favored over those that have this requirement.
10. Install tight -fitting covers and manhole cover inserts to minimize mosquito access to permanent sources of standing water. 11-865
www.cvmvcd.org 19
Coachella Valley Mosquito and Vector Control District
ABATEMENT AND
HEALTH AND SAFETY CODE
Under the California Health and Safety Code (HSC), mosquito and vector control districts may legally abate a public nuisance, including areas that allow for the development, attraction, or harborage of mosquitoes or other vectors. Abatement can result in civil penalties of up to $1000.00 per day per violation (HSC §2085(a), §2061).
The District begins correcting public nuisances through voluntary compliance from the property owners or parties in possession of property (Responsible Party). Persistent violators may be subject to additional enforcement action such as having the abatement work performed by the District at the Responsible Party's expense or having civil penalties assessed against the Responsible Party.
The District will inspect property to confirm and document that a public nuisance exists. From there, the District may issue a Request for Compliance, followed by a Notice of Violation if the nuisance is not remedied. If the issue is still not resolved, the District may issue a Notice of Public Nuisance and Order to Abate.
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WHAT HAPPENS WHEN YOU REPORT
A MOSQUITO PROBLEM?
District Call Center
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63,622 inspections
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276 021 mosquitoes
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Watch the video:
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www.youtube.com/
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11-867
COACHELLA VALLEY MOSQUITO
AND VECTOR CONTROL DISTRICT
Protection and Prevention since 1928
The Coachella Valley Mosquito and Vector Control District is a non -enterprise special district accountable to the residents of the Coachella Valley and charged with protecting the public health within its boundaries through the control of vectors (such as mosquitoes) and vector -borne diseases.
The District boundary encompasses 2400 square miles, including Cathedral City, Coachella, Desert Hot Springs, Indian Wells, Indio, La Quinta, Palm Desert, Palm Springs, Rancho Mirage, and unincorporated sections of Riverside County.
The District operates under the California Health and Safety Code, Division 3, Sections 2000-2910 and is governed by an 11 -member Board of Trustees. There are 57 full-time employees and 3-6 seasonal staff from April to November.
HELP US HELP YOU PROTECT YOUR COMMUNITY
FIGHT THE BITE!
COACHELLA VALLEY MOSQUITO AND VECTOR CONTROL DISTRICT
43-420 Trader Place, Indio, CA 92201
Mailing Address
P.O. Box 2967, Indio, CA 92202
Toll -Free (888) 343-9399
District Office (760) 342-8287
District Fax (760) 342-8110
[email protected]
www.CVMVCD.org
11-868
2014 Whitewater River Region WQMP
Skilled Nursing Facility
Appendix E
Soils Report
11-869
GEOTECHNICAL INVESTIGATION
PROPOSED SKILLED NURSING FACILITY
APN 685-120-003 & 004
NEC GERALD FORD DRIVE AND BOB HOPE DRIVE
RANCHO MIRAGE, CALIFORNIA
-Prepared By-
Sladden Engineering
45-090 Golf Center Parkway, Suite F
Indio, California 92201
(760) 863-0713
Sladden Engineering
11-870
Sladden Engineering
45090 Golf Center Parkway, Suite F, Indio, California 92201 (760) 863-0713 Fax (760) 863-0847 6782 Stanton Avenue, Suite C, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369 450 Egan Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8863 www.slad denengineering.com
August 28, 2023 Project No. 544-23112
23-07-368
Prest Vuksic Architects
44530 San Pablo, Suite 200
Palm Desert, California 92260
Subject: Geotechnical Investigation
Project_
Proposed Skilled Nursing Facility
APN 685-120-003 & 685-120-004
NEC Gerald Ford Drive and Bob Hope Drive
Rancho Mirage, California
Sladden Engineering is pleased to present the results of the geotechnical investigation for the skilled nursing facility proposed for the subject site (APN 685-120-003 & 004) located on Gerald Ford Drive in the City of Rancho Mirage, California. Our services were completed in accordance with our proposal for geotechnical engineering services dated March 2, 2023 and your authorization to proceed with the work.
The purpose of our investigation was to explore the subsurface conditions on the site to provide recommendations for foundation design and the design of the various site improvements. Evaluation of environmental issues and hazardous wastes were not included within the scope of services provided.
The opinions, recommendations and design criteria presented in this report are based on our field exploration program, laboratory testing and engineering analyses. Based on the results of our investigation, it is our professional opinion that the proposed project should be feasible from a geotechnical perspective provided that the recommendations presented in this report are implemented in design and carried -out through construction.
We appreciate the opportunity to provide service to you on this project. If you have any questions regarding this report, please contact the undersigned.
Respectfully submitted,
SLADDEN
M. thew J. Cohrt, C.E.G. 2634 Brett L. Anderson,
Principal Geologist �q �a� Principal Engineer
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W. Minor III, P.G. 9735
Hier Geologist
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John Nielsen, G.E.j►;�
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11-871
GEOTECHNICAL INVESTIGATION
PROPOSED SKILLED NURSING FACILITY
APN 685-120-003 & 004
NEC GERALD FORD DRIVE AND BOB HOPE DRIVE
RANCHO MIRAGE, CALIFORNIA
TABLE OF CONTENTS
INTRODUCTION 1
PROJECT DESCRIPTION 1
SCOPE OF SERVICES 2
SITE CONDITIONS 2
GEOLOGIC SETTING 3
SUBSURFACE CONDITIONS 3
SEISMICITY AND FAULTING 4
San Andreas Fault Zone 5
Burnt Mountain Fault 5
Eureka Peak Fault 5
San Jacinto Fault Zone 5
Pinto Mountain Fault 6
SESISMIC DESIGN PARAMETERS 6
GEOLOGIC HAZARDS 7
CONCLUSIONS 10
EARTHWORK AND GRADING 11
Preparation of Building Areas 11
Stripping 11
Compaction 11
Shrinkage and Subsidence 12
CONVENTIONAL SPREAD FOOTINGS 12
SLABS -ON -GRADE 13
PRELIMINARY PAVEMENT DESIGN 13
CORROSION SERIES 14
UTILITY TRENCH BACKFILL 14
EXTERIOR CONCRETE FLATWORK 14
DRAINAGE 14
LIMITATIONS 15
ADDITIONAL SERVICES 15
REFERENCES 16
FIGURES - Site Location Map
Regional Geologic Map
Exploration Location Map
Regional Fault Map
APPENDIX A- Historical Earthquakes 1932 -Present (Magnitude >_ 3.0) APPENDIX B- Seismic Design Map and Report
Site -Specific Ground Motion Parameters
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TABLE OF CONTENTS
(Continued)
APPENDIX C- Riverside County Parcel Report
APPENDIX D- Seismic Settlement Analyses
APPENDIX E - Field Exploration
APPENDIX F- Laboratory Testing
APPENDIX G- Settlement Analysis — Schmertmann Method
APPENDIX H- Site Plans
PLATES- Geotechnical Map
Cross Sections
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Sladden Engineering
August 28, 2023 1 Project No. 544-23112
23-07-368
INTRODUCTION
This report presents the results of the geotechnical investigation performed by Sladden Engineering (Sladden) for the skilled nursing facility proposed for the project site (APN 685-120-003 & 004) located on the northeast corner of Bob Hope Drive and Gerald Ford Drive in the City of Rancho Mirage, California.
The site is located at approximately 33.7881 degrees north latitude and 116.4051 degrees west longitude.
The approximate location of the site is indicated on the Site Location Map (Figure 1).
Our investigation was conducted to evaluate the engineering properties of the subsurface materials, to evaluate their in -situ characteristics, and to provide engineering recommendations and design criteria for site preparation, foundation design and the design of various site improvements. This study was conducted in general conformance with the criteria outlined in the California Geological Survey - Note 48 (CGS, 2022). Our study included a review of pertinent published and unpublished geotechnical and geological literature regarding seismicity, at and near the subject site.
PROJECT DESCRIPTION
Based on the provided project plans (PVG Architects, 2023), it is our understanding that the project will consist of constructing a new skilled nursing facility on the site. The new building will occupy approximately 40,000 square feet (ft2) of new building footprint. In addition, concrete flatwork, paved parking areas, landscape areas and various associated site improvements are also anticipated. We expect that the proposed skilled nursing facility will consist of a one-story, wood frame or steel -frame structure supported on conventional shallow spread footings with concrete slabs -on -grade.
Based on the generally level topography of the site, Sladden anticipates that grading will be limited to minor cuts and fills to construct the desired pad elevation and to provide adequate gradients for site drainage. This does not include our recommendation to overexcavate and replacement compaction of the foundation bearing soil within the building envelope.
Structural foundation loads were not available at the time we prepared this report. Based on our experience with relatively lightweight wood -frame and steel frame structures, we expect that isolated column loads will be less than 50 kips and that continuous wall loads will weigh less than 5 kips per linear foot. If these assumed loads vary significantly from the actual loads, we should be consulted to verify the applicability of the recommendations presented in this report. 11- 874
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August 28, 2023 2 Project No. 544-23112
23-07-368
SCOPE OF SERVICES
The purpose of our investigation was to determine specific engineering characteristics of the surface and near surface soil to develop foundation design criteria and recommendations for site preparation.
Exploration of the subject site was achieved by excavating ten (10) exploratory bores to depths between approximately 11 to 51 feet below the existing ground surface (bgs). Specifically, our site characterization consisted of the following tasks:
• Site reconnaissance to assess the existing surface conditions on and adjacent to the site. • Excavated ten (10) exploratory bores to depths between approximately 11 to 51 feet bgs to characterize the near surface soil conditions. Representative samples of the soil were classified in the field and retained for laboratory testing and engineering analyses. • Performed laboratory testing on selected soil samples to evaluate the engineering characteristics of the site soil.
• Reviewed geologic literature and geologic hazards.
• Performed engineering analyses to develop recommendations for foundation design and site preparation.
• The preparation of this report summarizing our work at the site.
SITE CONDITIONS
General. The site is formally identified by the County of Riverside as APN 685-120-003 & 004 and consists of approximately 5.67 acres of undeveloped land. At the time of our investigation, the site was covered with scattered low growth native vegetation. The property is near the elevation of the adjacent properties and roadways, and is bounded by Gerald Ford Drive to the south, Bob Hope Drive to the west, Via Marta to the north, and developed residential properties to the east.
Topography and Drainage. The site consists of undulating topography consistent with the eolian sand deposits throughout the site vicinity. Based on our review of the Cathedral City 7.5 -Minute Quadrangle Map (USGS, 2015), the site is situated at an elevation of approximately 300 feet above mean sea level (MSL). Surface gradients in the site vicinity descend to the southeast at an inclination of ten horizontal to one vertical (10H:1V) and less.
Natural ponding of water or surface seeps were not observed at or near the site during our investigation conducted on May 24, 2023. Site drainage appears to be sheet flow and surface infiltration. "Blue line" streams are not mapped on the property and significant drainage courses were not identified on the property during our field investigation.
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August 28, 2023 3 Project No. 544-23112
23-07-368
GEOLOGIC SETTING
The site is located within the Colorado Desert Physiographic Province (also referred to as the Salton Trough) that is characterized as a northwest -southeast trending structural depression extending from the Gulf of California to the Banning Pass. The Salton Trough is dominated by several northwest trending faults, most notably the San Andreas Fault system. The Salton Trough is bounded by the Santa Rosa — San Jacinto Mountains on the southwest, the San Bernardino Mountains on the north, the Little San Bernardino - Chocolate — Orocopia Mountains on the east, and extends through the Imperial Valley into the Gulf of California on the south.
A relatively thick sequence (20,000 feet) of sediments have been deposited in the Coachella Valley portion of the Salton Trough from the Miocene to present times. The sediments are predominately terrestrial in nature with some lacustrian (lake) and minor marine deposits. The major contributor of these sediments was the Colorado River. The mountains surrounding the Coachella Valley are composed primarily of Precambrian metamorphic and Mesozoic "granitic" rock.
The Salton Trough is an internally draining area without a readily available outlet to Gulf of California having portions well below sea level (-253' msl). The region is intermittently blocked from the Gulf of California by the damming effects of the Colorado River delta (current elevation +30'msl). Between about 300AD and 1600 AD (to 1700+) the Salton Trough was inundated by the River's water, forming ancient Lake Cahuilla (max. elevation +58' msl). Since that time the floor of the Trough has been repeatedly flooded with other "fresh" water lakes (1849, 1861, and 1891), the most recent and historically long lived being the current Salton Sea (1905). The sole outlet for these waters is evaporation, leaving behind vast amounts of terrestrial sediment materials and evaporite minerals.
Rogers (1965) mapped the site to be immediately underlain by undifferentiated Quaternary -age dune sand (Qs). The regional geologic setting for the site vicinity is presented on the Regional Geologic Map (Figure 2).
SUBSURFACE CONDITIONS
The subsurface conditions at the site were investigated by excavating ten (10) exploratory boreholes to depths between approximately 11 to 51 feet bgs. The approximate exploratory locations are illustrated on the attached Geotechnical / Geologic Map and Exploration Location Map. The boreholes were advanced using a track -mounted limited access drill -rig (CME-75) equipped with 8 -inch outside diameter hollow stem augers. "Undisturbed" soil samples were recovered using an automatic trip hammer advanced by a mechanically actuated mechanism lifting a 140 pound weight 30 -inches and free falling. A representative of Sladden was on -site to log the materials encountered and retrieve samples for laboratory testing and engineering analyses.
During our field investigation, native eolian sand consisting of fine-grained sand (SP) was encountered to the maximum explored depth of 51 feet bgs. Generally, the native earth materials appeared yellowish brown, dry, loose to dense and fine-grained. The field sampler blowcounts indicated the in -situ density of the near surface soil generally increases with depth.
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August 28, 2023 4 Project No. 544-23112
23-07-368
Groundwater was not encountered during our field investigation to the maximum explored depth of 51 feet bgs. Information regarding the approximate depth to groundwater provided by the California Department of Water Resources online database (CDWR, 2023) indicates that the historic high depth to groundwater is in excess of 150 feet below the existing ground surface in the vicinity of the site. The following table provides a summary of the recorded high groundwater depths in the vicinity of the project.
TABLE 1
GROUNDWATER DEPTHS
STATE WELL
LAT/LONG
DISTANCE (KM)
DATE
DEPTH (FT)
04S06E32N002S
33.7732/-116.3848
2.51 01/28/2002
251.5
04S05E35G003S
33.7817/-116.4312
2.52 03/07/2023
184.7
04S06E20M002S
33.8087/-116.3878
2.80 08/08/2003
154.7
04S06E18R001S
33.8195/-116.3903
3.75 03/07/2023
184.6
04S05E15R002S
33.8191/ -116.4415
4.80 03/10/2022
203.4
04S06E33J001S
33.7775/-116.3545
4.83 03/01/2023
178.8
04S06E35P001S
33.7733/-116.3308
7.07 03/11/2022
174.7
SEISMICITY AND FAULTING
It is our opinion that the most significant geologic hazard to the project is the potential for moderate to severe seismic to occur during the life of the project. The project site is located in the high seismic region within the influence of several fault systems that are considered to be active or potentially active.
Historic earthquakes in the project area include the 1968 Borrego Mountain event (M6.5), 1948 Desert Hot Springs event (M6.5), 1986 Palm Springs event (M 5.6), the 1992 Joshua Tree event (M6.1), the 1992 (M6.0) Big Bear event and the 1992 Landers event (M7.3). A list of earthquakes and earthquake epicenters (M>3.0) within 100 kilometers of the site, from 1932 to present, is presented within Appendix A (USGS, 2023)
Based on our research, the site is not located within either a State of California or County of Riverside designated fault zone (CGS, 2023 & RCPR, 2023). Table 2 lists the closest known faults that was generated in part using the EQFAULT computer program (Blake, 2000), as modified using the fault parameters from The Revised 2002 California Probabilistic Seismic Hazard Maps (Cao et al, 2003), Southern Earthquake Data Center (SCEDC, 2023) and the Quaternary Fault and Fold Database of the United States (USGS, 2023a). This table does not identify the probability of reactivation, or the on -site effects from earthquakes occurring on any of the other faults in the region.
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August 28, 2023
5 TABLE 2
CLOSEST KNOWN ACTIVE FAULTS
Project No. 544-23112
23-07-368
Fault Name
Distance
(Km)
Maximum
Event
San Andreas - Coachella
6.6 7.45
San Andreas - Southern
6.6 7.45
San Andreas - San Bernardino
16.5 7.5
Burnt Mountain
17.7 6.5
Eureka Peak
21.0 6.4
San Jacinto - Anza
34.3 7.2
Pinto Mountain
35.4 7.2
San Andreas Fault Zone
The San Andreas Fault Zone is located approximately 6.6 kilometer from the site and is a right -lateral zone of complex faulting consisting of numerous segments for an approximate combined total length of 1,200 kilometers. The recurrence interval between major ruptures varies between the major segments of the fault zone and is believed to range from under 20 years to over 300 years (SCEDC, 2023).
Paleo-seismic investigations along the Coachella Valley Segment of the San Andreas fault indicate five ground rupture events (about 825 AD, 982 AD, 1231 AD, 1502 AD, and 1680 AD) for the area (Fumal, 2002). Seih and Williams (1990) indicate the date for the most recent event on the Coachella Valley segment at about 1680 AD.
Burnt Mountain Fault
The Burnt Mountain Fault is located approximately 17.7 kilometer from the site and is a right -lateral strike slip fault that last ruptured during the magnitude 7.3 Landers event. The fault was unknown until the Landers earthquake in which 16 kilometers of the fault ruptured the ground surface (SCEDC, 2023).
Eureka Peak Fault
The Eureka Peak Fault is located approximately 21.0 kilometer from the site and is a right -lateral strike slip fault that was previously unknown prior to the magnitude 7.3 Landers event. During this event, the fault ruptured along approximately 10 kilometers of length. The fault is reported to probably handle a significant amount of slip transferred from the San Andreas fault zone (SCEDC, 2023).
San Jacinto Fault Zone
The San Jacinto Fault Zone is among the more active fault zones in the Southern California region and is located approximately 34.3 kilometers from the site. The northwest trending fault zone consists of a right - lateral strike -slip with minor right reverse sense of motion. The fault zone is composed of numerous segments: Borrego, Coyote Creek, Anza, San Jacinto Valley, and San Bernardino segments for an approximate combined total length of 210 kilometers (SCEDC, 2023).
The most recent surface rupture along the San Jacinto Fault Zone occurred during the Mw 6.5 April 8, 1968 earthquake (Borrego Mountain earthquake) on the Coyote Creek segment. Surface rupture occurred over 33 kilometers of the fault zone's length. The quake caused damage throughout much of Southern Sladden Engineering 11- 878
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California that included: severed electrical power lines, cracked plaster, collapsed ceilings, landslides and rock falls. The earthquake is believed to have initiated "triggered slip" along the Superstition Hills Fault, Imperial Fault and Banning -Mission Creek Faults (SCEDC, 2023).
Pinto Mountain Fault
The left -lateral, west -trending, strike -slip Pinto Mountain fault runs from Morongo Valley to Twentynine Palms for an approximate distance of 74 km (SCEDC, 2023). The Pinto Mountain fault is located approximately 35.4 kilometer from the site. The Pinto Mountain fault was neither offset nor deflected by the Johnson Valley and Eureka Peak faults when rupture occurred during the Landers earthquake (Sieh, 1996). However, the SCEDC (2023) indicates that portions of the Pinto Mountain fault experienced "triggered slip" during that event. The relatively straight trace of the Pinto Mountain fault suggests that it dips at a high angle and that it may have a significant dip -slip component. The fault forms complex intersections with other faults in the region and the recurrence interval is poorly constrained. The fault roughly forms the boundary between the Mojave Desert and Transverse Ranges Physiographic provinces (CGS, 2002).
SITE SPECIFIC GROUND MOTION PARAMETERS
Sladden has reviewed the 2022 California Building Code (CBC) and ASCE7-16 and developed site specific ground motion parameters for the subject site. The project site -specific ground motion parameters are summarized in the following table and included within Appendix B. The project Structural Engineer should verify that all design parameters provided are applicable for the subject project.
TABLE 3
GROUND MOTION PARAMETERS
Latitude / Longitude
33.7881/-116.4051
Risk Category
IV
Site Class
D
Code Reference Documents
ASCE 7-16; Chapter 11 & 21
Description
Type
Map Based
Site -Specific
MCER Ground Motion (0.2 second period)
Ss
1.714
---
MCER Ground Motion (1.0 second period)
Si
0.71 ---
Site-Modified Spectral Acceleration Value
SMs
1.714
1.967
Site -Modified Spectral Acceleration Value
SMi
null
1.779
Numeric Seismic Design Value at 0.2 second SA
SDS
1.143
1.311
Numeric Seismic Design Value at 1.0 second SA
SDI
null
1.186
Site Amplification Factor at 0.2 second
Fa
1 1
Site Amplification Factor at 1.0 second
Fv
null
2.5 Site Peak Ground Acceleration
PGAM
0.821
0.759
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GEOLOGIC HAZARDS
The site is located in an active seismic zone and will likely experience strong seismic shaking during the life of the proposed project. In general, the intensity of ground shaking will depend on several factors including: the distance to the earthquake focus, the earthquake magnitude, the response characteristics of the underlying earth materials, and the quality and type of construction. Geologic hazards as related to the site are discussed below.
Surface Rupture. Surface rupture is expected to occur along preexisting, known active fault traces. However, surface rupture could potentially splay or step from known active faults or rupture along unidentified traces. Based on our review of Jennings (1994), CGS (2023), RCPR (2023), and Rodgers (1965) known faults are not currently mapped on or immediately adjacent to the site. The site is not located within a State of California or County of Riverside designated fault hazard zone for fault rupture. In addition, evidence of active surface faulting was not observed during our review of non -stereo digitized photographs of the site and its vicinity (Google, 2023). Evidence of active surface fault rupture or secondary seismic effects (lateral spreading, lurching etc.) was not identified during our field investigation. Therefore, it is our opinion that risks associated with primary surface ground rupture should be considered "low".
II. Ground Shaking. The site has been subjected to past ground shaking by faults that traverse through the region. Strong seismic shaking from nearby active faults is expected to produce strong seismic shaking during the design life of the proposed project. The site modified peak ground acceleration is estimated to be 0.759 g.
III. Liquefaction and Seismic Settlement. Liquefaction is the process in which loose, saturated granular soil looses strength as a result of seismic induced cyclic loading. The strength loss occurs as a result of a decrease in shear capacity of the soil matrix due to a rapid increase in pore pressures. Generally, liquefaction can occur if all of the following conditions apply:
liquefaction -susceptible soil, saturated soil, and strong seismic shaking.
The State of California has not evaluated the Cathedral City Quadrangle for liquefaction hazards. However, the site is currently located within a County of Riverside designated "moderate" liquefaction hazard zone (Appendix C). However, based on the historic high groundwater depths in excess of 150 feet below the existing ground surface in the project vicinity (Table 1), risks associated with liquefaction are considered "negligible".
Seismic settlement (dry sand) may occur when loose granular soil densifies during seismic shaking, potentially resulting in damage to overlying structures and improvements. Our analyses indicate that the potential for seismic settlements impacting the site during a major seismic event on the nearby San Andreas Fault is significant. The peak ground acceleration utilized in our analyses was 0.759g (PGAM), in accordance with current guidelines (CGS, 2022). Our seismic settlement analyses indicated total settlements of up to
4.28 inches and 5.07 inches for BH-1 and BH-2, respectively. The seismic settlement estimates are presented within Appendix D and summarized in Table 4. 11- 880
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8 TABLE 4
SEISMIC SETTLEMENT ESTIMATES
EXISTING SITE CONDITIONS
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BH-1
BH-2
Max. Differential
Distance Between Bores (BH-1 to BH-2)
4.28 5.07
0.79 -inches
225 -Feet
10 FOOT OVEREXCAVATION AND RECOMPACTION
2.30 2.46
0.16 -inches
225- Feet
A review of the seismically induced settlement estimate for the top 50 feet of the soil profile revealed seismic settlements ranging from 4.28 to 5.07 inches. The maximum differential settlement between these bores is estimated to be 0.79 -inches occurring over a horizontal distance of approximately 225 feet.
IV. Clays and Cyclic Softening. The project site is underlain by eolian (wind blown) sand.
Accordingly, risks associated with volumetric changes in cohesive soil and cyclic softening are considered "negligible".
V. Tsunamis and Seiches. The site is situated at an elevated inland location and is not immediately adjacent to any impounded bodies of water. Therefore the risks associated with tsunamis and seiches are considered "negligible".
VI. Slope Failure, Landsliding, Rock Falls. The site is located on relatively flat ground and not immediately adjacent to any slopes or hillsides. Therefore, it is our professional opinion that risks associated with slope instability are considered "negligible".
VII. Volcanic Hazards. The site is not located in an area of known volcanism. Accordingly, risks associated with volcanic hazards are considered "remote".
VIII. Hazardous Materials. The site is not located in an area of known methane gas, hydrogen gas, tar seeps or oil production wells. Accordingly, these risks should be considered "remote".
IX. Expansive Soil. Expansion Index testing of the soil was performed to evaluate the expansion potential of the materials underlying the site. Based on the results of our testing (EI=0) the materials underlying the site are considered to have a "very low" expansion potential.
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X. Subsidence. Land subsidence can occur in valleys where aquifers were subjected to extensive groundwater pumping, such that groundwater pumping exceeds groundwater recharge. Generally, pore water reduction results in a rearrangement of skeletal grains and results in elastic (recoverable) or inelastic (unrecoverable) deformation of an aquifer system. According to the County of Riverside, the site is located within a subsidence "susceptible" zone (Appendix C). However, fissures or other surficial evidence of subsidence were not observed at or near the subject site during our field investigation.
Subsidence in the Coachella Valley is areal in nature with very little differential settlement occurring over short distances such as across building envelopes. At this time, subsidence is considered a regional problem requiring regional mitigation not specific to the project site. As such, site specific effects resulting from long term regional subsidence are beyond the scope of our investigation.
XI. Static Settlement. Static settlement resulting from the anticipated foundation loads have been calculated utilizing the Schmertmann Method (Appendix G). The ultimate static settlement is expected to be less than 1/2 inch when using the recommended allowable bearing pressures. As a practical matter, differential static settlement between footings can be assumed as one-half of the total static settlement.
XII. Hydrocollapse. The implementation of our remedial recommendations to over -excavate and recompact the upper 8 to 10 feet of the on -site soil profile is intended to mitigate the potential hydro -consolidation. Below 10 feet the SPT values reflect soil materials with a lower potential of hydrocollapse.
XIII. Naturally Occurring Asbestos. The site is underlain by sand deposits. Asbestos bearing rock formations are not mapped on or immediately adjacent to the site (serpentinite and ultramafic rocks). Accordingly, risks associated with asbestos are considered "remote".
XIV. Radon -222 Gas. The United States Environmental Protection Agency (EPA) recommends that individuals avoid long-term exposures to radon concentrations above 4 picocuries per liter (pCi/L). The California Department of Public Health (CDPH) lists 31 tests in the Rancho Mirage area with 2 tests containing more than 4.0 pCi/L (CDPH, 2016).
XV. Flooding and Erosion. Signs of flooding or erosion were not observed during our field investigation. Based on our review of the FEMA flood insurance rate map for the site vicinity, the site is situated in an area determined to be outside of the 0.2% annual chance floodplain (Zone X)" (FEMA, 2008). Accordingly, risks associated with flooding and erosion are considered "low".
XVI. Debris Flows. Debris flows are viscous flows consisting of poorly sorted mixtures of sediment and water and are generally initiated on slopes steeper than approximately six horizontal to one vertical (6H:1V)(Boggs, 2001). Based on the flat nature of the site, the lack of adjacent slopes, and the composition of the surface soil, we judge that risks associated with debris flows to be remote.
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CONCLUSIONS
Based on the results of our geotechnical investigation, it is our opinion that the proposed project is feasible from a geotechnical and engineering geologic perspective provided the recommendations of this report are incorporated into the design and implemented during construction.
The surface soil at the site is considered loose, potentially compressible and not suitable for shallow foundation support in the existing condition. To mitigate the potential for differential settlements, we recommend remedial grading throughout the new building areas. Upon completion of the remedial grading, the new building elements may be supported upon conventional shallow spread footings.
Varying amounts of caving occurred within each of our exploratory bores and caving may occur in deeper excavations. All excavations should be constructed in accordance with the normal CalOSHA excavation criteria. On the basis of our observations of the materials encountered, we anticipate that the subsoil will conform to that described by CalOSHA as Type C, but soil conditions should be verified in the field by "Competent persons" employed by the Contractor.
Our analyses indicated that the potential for seismic settlements impacting the site during a major seismic event on the nearby San Andreas Fault to be severe. The seismic settlement estimates are presented on the seismic settlement data sheets within Appendix D and summarized within Table 4. As previously stated in Table 4, our analyses indicate total settlements up to 5 inches. However, based upon the general uniform subsurface soil conditions, the seismic settlement is expected to be "areal" in nature and the potential damaging differential settlement is expected to be minimal. The differential seismic settlement is expected to be approximately 0.79 inch over a lateral distance of approximately 225 feet. The remedial grading recommended within the building footprint and beyond are intended to produce a uniform compacted soil mat beneath the structures to mitigate seismic differential seismic settlement.
The following recommendations present more detailed design criteria that were developed on the basis of our field investigation and laboratory testing.
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EARTHWORK AND GRADING
Our recommendations are based upon the expectation that all earthwork including excavation, backfill and preparation of the subgrade soil, will be performed in accordance with the geotechnical recommendations presented in this report and portions of the local regulatory requirements, as applicable. All earthwork recommended in this report should be performed under the observation and testing of Sladden Engineering. The following geotechnical engineering recommendations for the proposed project are based on observations during the field investigation program and our laboratory testing and geotechnical engineering analyses.
a. Preparation of the Building Areas. To provide firm and uniform bearing conditions and to reduce the effects of potential seismically induced settlements, we recommend over -excavation and re - compaction throughout the building areas. To mitigate potential seismic settlements, we recommend that the top 8-10 feet of the soil profile be removed and recompacted to at least 90 - percent of the maximum density as determined by ASTM Test Method D1557. Remedial grading should extend laterally, a minimum of 10 feet beyond the building limits. The native soil exposed by over -excavation should be scarified, moisture conditioned to near optimum moisture content, and compacted to 90 percent or more relative compaction (ASTM 1557) prior to fill placement.
The previously removed soil may then be replaced as engineered fill material as recommended in Section C.
b. Stripping. Areas to be graded or over -excavated should be cleared of existing vegetation and associated root systems. All areas scheduled to receive fill or over -excavation should be cleared of old fills and irreducible matter. The unsuitable material should be removed off site. Voids left by obstructions should be properly backfilled in accordance with the compaction recommendations of this report.
c. Compaction. Native soil used as engineered fill must be free of organic material, debris, and other deleterious substances, and not contain irreducible matter greater than six (6) inches in maximum dimension. Place fill materials in six-inch lifts in a loose condition. If import fill is required, the material must be of a low to non -expansive nature and should be submitted to Sladden for testing and approval prior to import and should meet the following criteria:
Plastic Index
Liquid Limit
Percent Soil Passing #200 Sieve
Maximum Aggregate Size
Less than 12
Less than 35
Between 15% and 35%
3 inches
Sladden recommends full-time observation and testing during pad and pavement grading, and intermittent site visits by the project engineer during grading. Compact subgrade and fill with acceptable compaction equipment, to 90 percent or more relative compaction. The bottom of the exposed subgrade should be observed by a representative of Sladden Engineering prior to fill placement. Compaction testing should be performed on each lift to verify proper placement and compaction of the fill materials. Table 5 provides a summary of the excavation and compaction recommendations.
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12 TABLE 5
SUMMARY OF RECOMMENDATIONS
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*Remedial Grading
Excavation and recompaction within the building
envelope and extending laterally for 10 feet beyond the building limits and to a minimum depth of 8-10 below
existing grade.
**Native / Import Engineered Fill
Place in thin lifts not exceeding 6 inches in a loose
condition and compact to a minimum of 90 percent
relative compaction.
Class II Aggregate Base Material
Compact to at least 95 percent relative compaction within 2 percent of optimum moisture content.
**Asphalt Concrete Sections
Compact the top 12 inches of the subgrade to at least 95 percent relative compaction within 2 percent of optimum moisture content.
*Actual depth may vary and should be determined by a representative of Sladden Engineering in the field during construction.
**ASTM D1557
d. Shrinkage and Subsidence. We anticipate volumetric shrinkage of the material that is excavated and replaced as controlled compacted fill. We estimate that this shrinkage could vary from 10 to 15 percent. Subsidence of the surfaces that are scarified and recompacted should be between 1 and 2 tenths of a foot. This will vary depending upon the type of equipment used, the moisture content of the soil at the time of grading and the actual degree of compaction attained.
CONVENTIONAL SPREAD FOOTINGS
Conventional shallow spread footings may be utilized for support of the proposed skilled nursing facility structures provided that the estimated settlements presented herein are considered in design. All footings should be founded upon property compacted engineered fill soil in accordance with the recommendations of this report and should have a minimum embedment depth of 12 inches measured from the lowest adjacent finished grade. Continuous and isolated pad footings should have minimum widths of 12 inches and 24 inches, respectively. Continuous and isolated pad footings placed on compact engineered fill soil may be designed for an allowable (net) bearing pressures of 1800 and 2000 pounds per square foot (psf), respectively. Allowable increases of 250 psf for each additional 1 foot in width and 250 psf for each additional 6 inches in depth may be utilized, if desired. The maximum allowable bearing pressure must not exceed 3,000 psf. The allowable bearing pressures apply to combined dead and sustained live loads.
Lateral load resistance for the spread footings will be developed by passive soil pressure against the sides of the footings below grade and by friction acting at the base of the concrete footings bearing on compacted fill. An allowable passive pressure of 300 psf per foot of depth may be used for design purposes. An allowable coefficient of friction 0.45 may be used for dead and sustained live loads to compute the frictional resistance of footings placed directly on compacted fill. Under seismic and wind loading conditions, the passive pressure and frictional resistance may be increased by one-third. 11- 885
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Prior to placement of forms, reinforcement or concrete, all footing trenches should be observed by a representative of the project geotechnical consultant to verify adequate embedment depths and exposed soil conditions. The trenches should be trimmed neat, level and square. All loose, disturbed, sloughed or moisture -softened soil and/or any construction debris should be removed prior to concrete placement.
SLABS -ON -GRADE
To reduce the risk of heave, cracking and settlement of non-structural supporting concrete slabs -on - grade, place on properly compacted fill as outlined Table 5. Subgrades for slabs should be near optimum moisture content and should not be permitted to dry prior to concrete placement and should be firm and unyielding. Remove loose or disturbed soil, replace and compact the subgrade to a minimum of 90 percent relative compaction.
Slab thickness and reinforcement must be determined by the Structural Engineer. Support slab reinforcement on concrete chairs so that the reinforcement is placed at slab mid -height. We recommend a minimum floor slab thickness of 5.0 inches and minimum reinforcement of #4 bars at 24 inches on center in each direction. Thicker slabs may be required depending on interior loading. Slabs with moisture sensitive surfaces should be underlain with a moisture vapor barrier consisting of a polyvinyl chloride membrane such as 10 -mil Visqueen, or equivalent. To reduce the potential for puncture, the membrane should be placed on a pad surface that has been graded smooth without any sharp protrusions. If a smooth surface cannot be achieved by grading, consideration should be given to placing a thin leveling course of sand across the pad surface prior to the placement of the membrane.
PRELIMINARY PAVEMENT DESIGN
Design asphalt concrete pavements in accordance with Topic 608 of the Caltrans Highway Design Manual based on R -Value and Traffic Index. The design R -Value was estimated to be in excess of 60. Any imported soil should be tested for R -Value. The actual R -Value of subgrade soil should be reevaluated prior to the final pavement design.
Traffic Indices (TI) of 5.0 and 6.5 were used for light duty and heavy duty pavements, respectively. We assumed Asphalt Concrete (AC) over Class II Aggregate Base (AB). Preliminary flexible pavement layer thickness is as follows:
RECOMMENDED ASPHALT PAVEMENT SECTION LAYER THICKNESS
Pavement Material
Recommended Thickness
TI=5.0
TI=6.5
Asphalt Concrete Surface Course
3.0 inches
3.0 inches
Class II Aggregate Base Course
4.0 inches
6.0 inches
Compacted Subgrade Soil
12.0 inches
12.0 inches
Asphalt concrete should conform to Section 39 of the latest edition of the CalTrans Standard Specifications. Class II aggregate base should conform to Section 26 Caltrans Standard Specifications, latest edition. The aggregate base course should be compacted to at least 95 percent of the maximum dry density as determined by ASTM Method D 1557 or to the dry density revealed by the R -value test data, whichever is greater.
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CORROSION SERIES
The soluble sulfate concentrations of the surface soil were determined to be 20 parts per million (ppm).
The soil is considered to have a "low -SO" corrosion potential with respect to concrete. The use of Type V cement and special sulfate resistant concrete mixes should not be necessary. Soluble sulfate content of the surface soil should be reevaluated after grading and appropriate concrete mix designs should be established based upon post -grading test results.
The pH levels of the surface soil was 7.5. Based on soluble chloride concentration testing (50 ppm) the soil is considered non -corrosive with respect to normal grade steel. The minimum resistivity of the surface soil was found to be 24,000 ohm -cm that suggests the site soil is considered to have a "negligible" corrosion potential with respect to ferrous metal installations. A corrosion expert should be consulted regarding appropriate corrosion protection measures.
UTILITY TRENCH BACKFILL
Utility trench backfill should be compacted to a minimum of 90 percent relative compaction based on ASTM Test Method D-1557. Trench backfill materials should be placed in loose lifts not greater than six inches, moisture conditioned (or air-dried) as necessary to achieve near optimum moisture conditions, and then mechanically compacted in -place to a minimum relative compaction of 90 percent. A representative of Sladden should test the backfill to verify adequate compaction.
EXTERIOR CONCRETE FLATWORK
To minimize cracking of concrete flatwork, the subgrade soil below concrete flatwork areas should first be compacted to a minimum relative compaction of 90 percent of the maximum dry density determined by ASTM Test Method D-1557. A representative of Sladden should observe and test the density and moisture content of the subgrade soil prior to placing concrete.
DRAINAGE
Provide final grades with positive gradients away from foundations to promote rapid removal of surface water runoff to an adequate discharge point. Water should not be allowed to be pond on or within five (5) feet foundation elements and be directed away from building foundations to an adequate discharge point. Subgrade drainage should be evaluated by the project Geotechnical Engineer upon completion of the precise grading plans and in the field during grading. 11- 887
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LIMITATIONS
The findings and recommendations presented in this report are based upon our interpretation of the soil conditions between the exploratory bore locations and extrapolation of these conditions throughout the proposed building area. Should conditions encountered during grading appear different than those indicated in this report, this office should be immediately notified.
The use of this report by other parties or for other projects is not authorized. The recommendations of this report are contingent upon monitoring of the grading operations by a representative of Sladden Engineering. All recommendations are considered to be tentative pending our review of the grading and foundation plans, grading methods, and additional testing if necessary. If others are employed to perform any soil testing, this office should be notified prior to such testing in order to coordinate any required site visits by our representatives and to provide indemnification for Sladden Engineering.
We recommend that a pre -job conference be held on the site prior to the initiation of site grading. The purpose of that meeting will be to assure a complete understanding of the recommendations presented in this report each applies to the actual grading performed.
ADDITIONAL SERVICES
Once final project plans and specifications are completed, those should be reviewed by Sladden Engineering prior to construction to confirm that the intent of the recommendations presented herein have been properly implemented into design. Following the review of plans and specifications, observations should be performed by the Sladden during construction to document grading, and that foundation elements are founded on/or penetrate into the recommended soil, and that suitable backfill soil is placed upon competent materials and properly compacted at the recommended moisture content.
Tests and observations should be performed during grading by a Sladden representative to verify that the grading is being performed in accordance with the project specifications. Field density testing shall be performed in accordance with acceptable ASTM test methods. The minimum acceptable degree of compaction should be 90 percent for subgrade soil and 95 percent for Class II aggregate base as obtained by ASTM Test Method D1557. Where testing indicates insufficient density, additional compactive effort shall be applied until retesting indicates satisfactory compaction. 11- 888
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REFERENCES
Army Engineering Technical Manual (AETM), 1987, TM 5-809-12, Table 4-1, 8/25/1987.
Blake, T., 2000, EQFAULT and EQSEARCH, Computer Programs for Deterministic and Probabilistic Prediction of Peak Horizontal Acceleration from Digitized California Faults.
Boggs, S. Jr., (2001), "Principles of Sedimentology and Stratigraphy", Prentice Hall, third edition California Building Code (CBC), (2022), California Building Standards Commission.
California Department of Public Health (CDPH), 2016, California Indoor Radon Test Results.
California Department of Water Resources
California Geological Survey (CGS), 2002, California Geomorphic Provinces: Note 36.
California Geological Survey (CGS), 2023, Earthquake Zones of Required Investigation; available at:
https://maps.conservation.ca.gov/cgs/EQZApp/app/
California Geological Survey (CGS), 2022, California Geological Survey - Note 48, Checklist for the Review of Engineering Geology and Seismology Reports for California Public Schools, Hospitals, and Essential Services Buildings, dated November 2022.
Cao T., Bryant, W.A., Rowshandel B., Branum D., Wills C.J., (2003), "The Revised 2002 California Probabilistic Seismic Hazard Maps".
FEMA, 2008, Flood Insurance Rate Map, Panel 1595 of 3805, Map Number 06065C1595G, dated August 28, 2008.
Fumal, T. E., Rymer, M. J., and Seits, G. G., 2002, Timing of Large Earthquakes since AD 800 on the Mission Creek Strand of the San Andreas Fault Zone At Thousand Palms Oasis Near Palms Springs, California, Bulletin of Seismological Society of America, October 2002, v. 92, no. 7, pps. 2841— 2860.
GoogleEarth.com, 2023, Vertical Aerial Photograph for the Rancho Mirage area, California, Undated, Variable Scale.
Jennings, Charles W. (Compiler), 1994, Fault Activity Map of California and Adjacent Areas, California Division of Mines and Geology, Geologic Data Map No. 6
Prest Vuksic Greenwood Architects Interiors, 2023, Site Plan, AHC — Skilled Nursing Facility, Rancho Mirage; Sheet A101, dated May 3, 2003; Scale: 1"=30'
Riverside County Parcel Report (RCPR), 2023, available at https://gisl.countyofriverside.us/Html5Viewer/index.html?viewer=MMC Public Rogers T.H (compiler), Jenkins, O.P (edition), 1965, Geologic Map of California, Santa Ana Sheet, sixth printing 1992, California Division of Mines and Geology, 1: 250,000. 11- 889
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REFERENCES
(Continued)
Sieh, K., 1996, The Repetition of Large -Earthquake Ruptures, Proceedings of the Natural Academy of Sciences, USA, Volume 93, Pages 3764-3771.
Seih, Kerry E., and Williams, Patrick L., 1990, Behavior of the Southern San Andreas Fault During the Past 300 Years, Journal of Geophysical Research, Vol. 95, No. B5, pps. 6629 — 6645.
Southern California Earthquake Center, (SCEDC), 2023, U.S. Geological Survey Pasadena Office Earthquake Information Center Web Page, Reviewed Online at: http://www.data.scec.org Structural Engineer Association (SEA), 2023, Seismic Design Maps; available at:
https://seismicmaps.org/
United States Geological Survey (USGS), 2015, Cathedral City 7.5 Minute Quadrangle Map, 1:24000.
United States Geological Survey (USGS), 2023a, Quaternary Fault and Fold Database; available at:
https://www.usgs . gov/programs/earthquake-hazards/google-earthtmkml-files United States Geological Survey (USGS), 2023b, Risk -Targeted Ground Motion Calculator; available at:
https://earthquake.usgs.gov/designmaps/rtgm/
United States Geological Survey (USGS), 2023c, Unified Hazard Tool; available at:
https://earthquake.usgs.gov/hazards/interactive/
United States Geological Survey (USGS), 2023d, Quaternary Faults Web Application, Geologic Hazards Science Center — Earthquake Hazards Program; available at:
https://usgs.maps.arcgis . com/apps/webappviewer/index.htm1?id=5abU38b3a16ti4561 a9bUaadtti89 12fcf
11- 890
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FIGURES
SITE LOCATION MAP
REGIONAL GEOLOGIC MAP
EXPLORATION LOCATION MAP
REGIONAL FAULT MAP
11- 891
Sladden Engineering
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23-07-368
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FIGURE
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.Redlands
Eliq 14<.ir.;t ;
•. Gm a Ladd: yA1r
* Wiwi Tk c+.11
Moran,:
,Val ley
Sun OW
f aka Eisnwre
A N' iota;
11,1611k i fa
Torn mill
Cat
Do ss 0
"stone
ate Q uatern ary
stest Queleinary
- s, dle and hie CLialern ary
„ Jo_ la' Qabase
itstarc Is 150 yeersi, tee constrerned ocetloe
gr4nrny
Hemet. '
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idyIlwdll
241
h,. .H. i,4 r,w
N7.1 vi lJ lli Al!
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r l ,1
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r -
Palter Spnny;
!:t
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• • • Hle+rrc I< 150 years), modemte4/ unstained Opa aon •• •• Hiebr15 I< ISO years% mreetedbcktion
— Latest Quaternary t<14,040 years). net coo0a rea b eaker, ';,
•
TNe Iita
• A !, :1 i ..M` A
•
Palm Dasert
La Quints '
J OSHUA
.Vndi att n
4 r,5*15 r;r .
<ee4h
.O at rlla+ V r
11< 14 eta@itl
•Mecca
4,1
•
t
[
P 1 ..*
.I.,S
t %
-COTTONWOOD MOUNTAINS G L
y F A
ksj YFis VASLL}
'Yl< 130. OW Seers). !reeved !meta,
— Ll-5 a and late Qs.18<0 ry l< 750.000 Iea51. areal c OmsY* <ec 10caa5< `.. I. File and Otte Ca tkemary 1< 7601100 'teen), nsad erele+y conetrmnatt oc=Hon - . " Latest Quaternary (. 15. 1)D0 ye ars) Ir ateraTely c: rstelred loc ator, ' - • - Latest Qlmtelnary I<05.000 ye ars) Interre d toCalce — Late tltM enary le 130,400 yen), was cdnktrdn851 Incat ron - . Lola 0uateaar/ ie 130,000 yews}, Iin edarMey lorrharned laeahorr • • ' I, iJ a and rite Q;Me mary 1* 7501]00 years). ).marred localu8< - . -. _,tie se taied 0ualemary 1< t E 'O .o' years?, well coostanrec locati on " 1fnRjrlCM1aled Qualemery I< 1 11 /Men Saari , rnodei'leely constrained rapa,A< • • Unarffere W atee• Qu Memen 7l < 1.6 make years), er'e r<ed bwtnn 1:577,791
C 5 10
C 5 10 20 km
I ill. re C
20 rill
Nmrrnm 0Myraplue, Eon, Con nie, HERE, 14566-
040146 . U5G5 , RASA. ESA M'1E11, NRCAIL 0E00O3
loo Ag immin ent p Carp.
National Geoglaan*, Es t. 'G IMP. HERE, UItOP-WC NG, 11.505, 14't ESA MET!, `150W). GESC0 . t4 11505
;cha r,1 P fop. 1 USG51
APPENDIX A
HISTORIC EARTHQUAKES 1932- PRESENT (MAG >_ 3.0)
11- 896
Sladden Engineering
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2023-06-04T04:43 :02.890Z
2023-05-20T08:18:16.240Z
2023-05-01T20:36:51.480Z
2023-04-30T11:44:03.220Z
2023-04-30T07:58:19.380Z
2023-04-30T07:32:12.730Z
2023-04-30T07:09:34.500Z
2023-04-30T05:55:59.950Z
2023-04-27T23:10:52.560Z
2023-04-26T06:46:58.450Z
2023-04-01T01:16:07.810Z
2023-03-24T13:45:13.700Z
2023-03-18T17:19:33.150Z
2023-03-18T16:52:07.010Z
2023-03-13T22:14:02.480Z
2023-02-13T10:09:46.070Z
2023-02-01T09:05:02.320Z
2023-01-11T18:59:20.030Z
2023-01-09T19:42:56.460Z
2022-12-31T12:12: 26.650Z
2022-12-31T11:41:09.460Z
2022-10-23T09:24:58.150Z
2022-10-07T22:45:05.470Z
2022-10-03T16:08:09.970Z
2022-09-30T11:50:11.750Z
2022-09-27T13:02:57.910Z
2022-09-20T18:34:41.320Z
2022-09-18T09:13:21.970Z
2022-09-18T06:55:48.060Z
2022-09-06T11:55:24.410Z
2022-08-25T07:32:51.460Z
2022-08-17T00:53:01.240Z
2022-07-17T18:18:39.190Z
2022-07-14T18:54:03.220Z
2022-07-13T16:01:36.530Z
2022-07-08T10:29:52.960Z
202 2-07-07T01:30: 31.400Z
2022-06-08T14:41:32.920Z
2022-06-03T10:40:29.910Z
2022-05-16T06:16:50.290Z
2022-05-13T13:32:36.610Z
2022-05-09T21:35:33.550Z
2022-04-11T23:40:20.790Z
LATITUDE
33.1406667
33.3821667
33.0278333
33.2026667
33.2036667
33.2095
33.2008333
33.0296667
33.0293333
34.0288333
33.3816667
33.178
33.2471667
33.2466667
34.1996667
32.9858333
33.886
33.6998333
33.396
33.3975
34.3556667
33.4806667
33.0413333
33.9246667
33.4803333
34.4301667
33.3613333
33.764
33.7635
33.9918333
33.3161667
33.9263333
33.272
33.2725
33.3111667
33.2323333
33.2308333
33.283
33.2338333
34.0078333
33.342
33.0391667
33.1728333
LONGITUDE
- 116.5265
- 116.9066667
-116.0081667
-115.5888333
-115.5858333
- 115.595
-115.59
-116.0076667
-116.0031667
- 116.8456667
-116.9096667
-116.4095
-115.7958333
-115.799
- 116.9315
-115.9256667
- 116.2578333
- 116.7613333
-116.3966667
-116.3933333
-116.9218333
- 116.4261667
-116.3546667
- 116.9215
-116.5131667
- 116.4898333
-115.791
- 115.9403333
-115.9373333
-116.843
-116.3506667
- 116.7775
- 115.983
- 115.9846667
-116.3316667
-116.1058333
-116.1063333
-116.1145
-116.6641667
-116.4448333
-116.8575
- 116.3538333
-115.6436667
DEPTH
7.72 12.64
7.47 2.68
1.89 2
2.04 7.69
9.96 19.7
12.96 11.69
7.07 7.15
8.77 11.07
3.19 15.82
4.89 3.88
4.73 5.79
11.79 7.62
9.3 7.67
3.01 6.34
6.15 17.26
11.56 14.2
4.9 4.95
11.68 9.02
9.6 2.76
10.94 8.25
7.37 11.34
7.73 MAGNITUDE
3.16 3.38
3.13 3.21
4.26 3.18
4.33 3.37
3.16 3.56
4.15 3.42
3.56 3.55
3.09 3.24
3.11 3.23
3.18 4.14
3.47 3.27
3.47 3.01
3.41 3.33
3.48 3.3
3.53 3.19
3.27 3.19
3.46 3.58
3.27 3.11
3.54 3.05
3.68 3.76
3.48 3.54
3.24 ID
c140477624
c140229151
c140216951
c140215983
c140215735
c140215687
c140215575
c140215511
c140212119
c140445744
ci39508378
c140189119
c140186575
c140186543
c140184319
c140414104
c140164927
c140401704
c140155015
c140151807
c140151719
c140364760
c140357392
c140355088
c140353408
c140107319
c140103391
c140102327
c140102247
ci40096951
c140331312
c140326728
ci40065399
ci40063127
ci40303048
c140299688
c140298688
ci40036375
ci40032983
ci40019919
ci40017591
c140255120
ci39990551
Project No. 544-23112
1 11-898
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2022-03-28T15:24:32.130Z
2022-03-22T11:59:40.490Z
2022-02-06T23:24:47.510Z
2022-01-30T17:46:26.970Z
2022-01-23T20:57:15.240Z
2022-01-18T07:39:15.120Z
2022-01-13T03:19:08.700Z
2022-01-08T23:46:18.060Z
2021-12-31T19:27:58.900Z
2021-12-2 3T 12 :44: 24.480Z
2021-11-20T01:39:18.760Z
2021-10-01T03 :46:5 6.750Z
2021-09-21T22:57:32.310Z
2021-09-21T22:41:30.350Z
2021-09-21T11:15:56.820Z
2021-08-19T04:29:46.130Z
2021-08-18T21:50:22.940Z
2021-08-18T21:45:14.590Z
2021-08-16T18:59:38.390Z
2021-08-05T06:51: 30.990Z
2021-07-31T00:59:29.340Z
2021-07-03T09:47:11.730Z
2021-06-23T20:06:07.180Z
2021-06-14T12:28:12.030Z
2021-06-12T08:25:07.770Z
2021-06-12T05 :5 5 : 20.790Z
2021-06-12T04:49:38.280Z
2021-06-12T04:48:44.5 60Z
2021-06-12T04:41:38.511Z
2021-06-12T04:41:37.860Z
2021-06-12T04:41:20.120Z
2021-06-12T04:40:23.030Z
2021-06-12T04:3 9 :46.510Z
2021-06-12T04:30: 28.490Z
2021-06-12T04:2 7 :34.880Z
2021-06-10T17:10:19.990Z
2021-06-07T21:24:52.050Z
2021-06-07T21:19 :11.490Z
2021-06-07T21:08: 28.590Z
2021-06-07T14:45:22.420Z
2021-06-06T11:03:20.960Z
2021-06-06T10:56:06.560Z
2021-06-06T08:05 :3 6.600Z
LATITUDE
33.1831667
33.4715
33.7323333
33.3355
33.4338333
33.8255
33.4688333
33.373
34.0346667
33.3711667
33.9943333
34.1386667
33.6346667
33.6348333
33.8736667
33.071
33.0748333
33.0733333
34.14 33.7553333
34.0356667
34.2511667
34.1468333
33.3551667
33.2028333
33.205
33.206
33.2003333
33.2354
33.1956667
33.2033333
33.2033333
33.2066667
33.2068333
33.2081667
33.2246667
33.1583333
33.1566667
33.1666667
33.1843333
33.1865
33.1561667
33.1855
LONGITUDE
- 115.6095
- 116.5325
-117.4786667
-116.9146667
-116.3975
- 116.7506667
-116.443
-116.8868333
-117.208
- 116.8856667
-116.7871667
-116.4441667
-116.7108333
- 116.7148333
- 115.9695
-115.9626667
-115.9675
- 115.9598333
-116.443
-116.9853333
-117.212
-117.0985
-116.4441667
-116.3121667
- 115.6401667
- 115.6605
-115.656
-115.6555
-115.6436
- 115.6543333
- 115.6575
-115.652
-115.647
- 115.6465
-115.6498333
-116.0925
-115.6401667
- 115.6398333
-115.64
-115.6373333
-115.6363333
- 115.6453333
-115.6395
DEPTH
2.28 13.09
11.02 13.31
6.66 12.48
13.97 4.58
14.43 4.6
11.94 6.7
13.42 13.22
5.05 2.99
3.84 7.07
4.38 17.42
14.55 4.14
5.47 12
1.81 2.78
2.62 2.94
8 3.12
2.99 2.41
2.47 2.77
2.97 8.87
5.46 5.88
5.34 4.93
5.61 5.85
9.8 MAGNITUDE
3.04 3.03
3.62 4
3.21 3.45
3.86 3.21
3.38 3.12
3.17 3.07
3.26 3.42
3.19 3.37
3.84 3.98
3.06 3.12
3.05 3.01
3.57 3.06
3.01 3.79
4.06 3.35
4.1407
3.61 3.02
3.79 4.32
3.85 3.94
3.03 3.61
3.35 4.08
3.52 3.06
3.08 3.81
ID
ci39980583
ci39974207
c140178728
ci39928087
ci39921383
ci39915287
ci39910255
c139906383
ci39900159
ci39894823
c139864743
ci40060160
ci39815335
ci39815127
ci39814663
c140014840
ci40014576
ci40014560
ci39774951
ci39764447
ci39759175
ci39727919
ci39716639
ci39705335
ci39937032
ci39936648
ci39936288
ci39936280
ew1623472898
ci39936232
ci39936216
ci39936208
ci39936192
ci39936136
ci39936128
ci39933160
ci39928744
ci39928712
ci39928664
ci39927952
ci39924760
ci39924744
ci39923832
Project No. 544-23112
2 11-899
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2021-06-06T05 :01:30.600Z
2021-06-01T21:2 9 :46.490Z
2021-05-09T09:09:33.800Z
2021-04-28T10:50:21.900Z
2021-04-13T21:35:03.940Z
2021-04-10T03 :5 7: 58.440Z
2021-04-09T00:33 :47.080Z
2021-04-04T21:14:44.870Z
2021-03-19T18:24:36.600Z
2021-02-2 2T00:2 8:10.410Z
2020-12-25T20:25:59.070Z
2020-12-06T15:17:53.130Z
2020-12-05T05:41:29.460Z
2020-11-17T07:19:21.210Z
2020-11-16T09:28:01.580Z
2020-10-20T10:30:46.070Z
2020-10-07T01:44:04.730Z
2020-09-25T17:10:11.370Z
2020-09-25T17:07:48.830Z
2020-09-21T13:20:38.360Z
2020-09-04T14:24:44.100Z
2020-08-14T09:05 :09.510Z
2020-08-11T11:19:57.690Z
2020-08-10T19:29:29.720Z
2020-08-10T18:58:53.030Z
2020-08-10T18:53:21.450Z
2020-08-10T18:30:05.830Z
2020-08-10T18:29:59.890Z
2020-08-10T17:39:15.940Z
2020-08-10T16:13:5 6.000Z
2020-08-10T16:03 : 39.160Z
2020-08-10T 16:00:13.640Z
2020-08-10T15 :58:16.660Z
2020-08-10T15:56:14.330Z
2020-08-10T15:55:48.220Z
2020-07-15T2 2:46:18.400Z
2020-07-07T02:34:01.690Z
2020-07-06T03:05:16.320Z
2020-06-28T22:13:58.510Z
2020-06-25T19:48:06.100Z
2020-06-21T09:11: 21.980Z
2020-06-07T01:50: 59.3 20Z
2020-05-13 T01:31:08.080Z
LATITUDE
33.1645
33.4596667
34.0265
33.1628333
33.8063333
34.1475
33.9323333
33.9661667
33.0316667
33.9976667
33.7473333
33.237
33.4211667
34.0711667
34.0433333
33.0053333
34.3541667
33.947
33.9491667
33.701
34.0878333
33.2693333
33.2271667
33.2653333
33.2513333
33.2653333
33.2298333
33.228
33.227
33.232
33.2503333
33.255
33.2436667
33.2468333
33.2506667
33.0191667
33.3456667
34.6063333
33.2341667
33.4465
34.2543333
33.1616667
33.499
LONGITUDE
-115.6446667
- 116.8916667
-117.2335
-116.3816667
-116.0878333
- 116.4451667
-116.7873333
-116.978
-116.442
- 116.8083333
-115.9211667
- 116.6693333
-116.9311667
-116.7215
-117.2331667
- 116.2895
-116.8266667
- 116.3955
-116.3938333
-117.4355
-116.8536667
- 115.9936667
-115.7018333
-115.6841667
-115.6755
- 115.6896667
-115.6925
-115.6955
-115.6991667
-115.6935
-115.688
-115.6846667
-115.6858333
-115.69
-115.6953333
-116.008
-116.3713333
- 116.6376667
- 115.6945
-116.4313333
-116.4298333
- 116.0031667
-116.5211667
DEPTH
5.36 12.83
16.29 7.33
3.03 5.88
14.76 13.13
6.61 9.83
3.68 9.2
8.08 5.33
15.06 7.14
7.82 3.29
3.42 9.12
1.9 6.97
3.16 2.87
3.02 4.42
3.67 2.85
3.26 3.27
2.31 1.91
2.4 2.07
2.52 10.49
11.36 7.35
2.72 10.7
2.17 7.09
10.16 MAGNITUDE
3.19 3.16
3.03 3.45
3.54 3
3.11 3.29
3.07 3.19
3.64 3.62
3.55 3.47
3.41 3.44
3.42 3.65
3.02 3.28
3.14 3.2
3.55 4.03
3.24 3.21
3.49 3.06
3.51 3.73
3.95 3.12
3.01 4.59
3.54 3.04
3.15 3.03
3.7 3.03
3 3.26
3.15 ID
ci39922872
ci39913520
ci39645767
ci39632647
c139849144
ci39845512
ci39844112
ci39838568
ci39585143
ci39797144
c139504023
ci39486671
ci39485527
ci39467983
ci39466855
ci39669176
ci39654952
ci38703802
ci38703786
ci38697738
ci38675450
ci39344127
ci39340599
ci39339191
ci39339095
ci39339079
ci37452101
ci39339015
ci39338839
ci39338487
ci39338447
c139338423
ci39338415
ci39338407
ci39338399
ci38592114
ci39282359
ci39281039
ci39271647
ci39266287
c139488496
ci39468576
ci38491706
Project No. 544-23112
3 11-900
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2020-05-12T02:46:47.250Z
2020-05-11T16:40:54.560Z
2020-05-10T22:07:40.370Z
2020-05-06T08:27:05.150Z
2020-04-09T05 :14: 50.080Z
2020-04-08T01:00:14.2 60Z
2020-04-08T00:35:56.820Z
2020-04-08T00:30:49.2 30Z
2020-04-06T15 :58:14.840Z
2020-04-05T22:37:18.820Z
2020-04-05T21:07 :44.910Z
2020-04-04T05 :12:3 5.150Z
2020-04-04T04:07:22.120Z
2020-04-04T02: 5 9: 2 3.2 80Z
2020-04-04T02 :05 :00.170Z
2020-04-04T01:55 : 3 5.800Z
2020-04-04T01:54: 2 2.5 70Z
2020-04-04T01:53 :18.9 20Z
2020-02-02T00:59:50.610Z
2019-11-20T06:42:23.430Z
2019-11-17T19:04:18.580Z
2019-11-10T23:18:12.020Z
2019-11-10T22:07:59.490Z
2019-11-10T09:44:43.310Z
2019-11-09T10:59:10.960Z
2019-10-29T16:21:32.590Z
2019-10-19T00:56:36.580Z
2019-09-20T09:47:43.250Z
2019-09-19T09:59:46.580Z
2019-09-16T18:11:51.690Z
2019-09-10T20:21:49.840Z
2019-09-04T00:18:46.170Z
2019-09-02T04:05 :04.610Z
2019-08-21T06:50:41.210Z
2019-07-22T16:26:56.070Z
2019-07-20T18:14:55.960Z
2019-07-19T18:40:14.930Z
2019-07-19T00:57:28.830Z
2019-06-13T12:38:30.650Z
2019-06-04T04:34:02.5 60Z
2019-06-02T20:04: 5 5.500Z
2019-05-08T16:14:59.220Z
2019-04-29T00:13 :14.280Z
LATITUDE
33.0118333
33.4975
33.0183333
33.1843333
33.5068333
33.4981667
33.5006667
33.4985
33.577
33.4961667
33.5036667
33.4921667
33.4913333
33.5011667
33.4946667
33.4801667
33.4931667
33.4895
33.5768333
33.4996667
33.1606667
33.8688333
33.8683333
33.9155
33.2538333
33.2281667
33.8926667
33.3193333
33.3596667
33.3618333
33.594
34.0056667
33.649
34.0126667
33.9966667
33.3113333
33.4535
33.3098333
33.9396667
33.9556667
33.8401667
33.2133333
33.315
LONGITUDE
-116.0231667
- 116.5041667
-116.0201667
-115.6156667
-116.5321667
- 116.5228333
-116.5236667
-116.5253333
- 115.9081667
- 116.4961667
-116.5278333
-116.5118333
-116.5188333
-116.519
-116.5153333
-116.4903333
-116.505
- 116.5063333
-116.8171667
-116.4581667
-115.653
-116.1965
-116.1958333
-116.7265
-115.9995
- 116.7433333
-116.6305
-116.4203333
-115.788
-115.789
-117.27
-116.7643333
-117.3335
- 116.7518333
-116.045
-116.2551667
-116.5753333
- 116.2568333
- 116.6745
-116.8233333
-117.0968333
- 116.0665
-116.4198333
DEPTH
9.89 12.49
10.16 10.62
11.03 10.27
10.28 9.98
8.24 13.25
10.53 9.85
9.62 10.37
10.28 9.21
10.31 10.45
5.16 5.73
2.42 8.09
8.2 16.13
8.71 10.21
14.93 8.36
3.21 3.1
13.69 13.3
5.73 17.33
8.23 11.65
10.99 11.54
17.3 15.6
10.84 10.63
8.21 MAGNITUDE
3.3 3.1
4.54 3.87
3.05 3.22
3.27 3.54
3.51 3.5
3.49 3.46
3.6 3.11
3.66 3.07
3.76 4.87
3.64 3.41
3.34 3.11
3.47 3.36
3.18 3.6
3.04 3.13
3.63 3.77
3.96 3.41
3.19 3.23
4.2 3.14
3.6 3.15
3.03 3.2
3.06 3.48
3.31 ID
c138490402
ci38489754
ci38488354
ci38482130
ci39378336
ci39141967
ci39141695
ci39141591
ci39138119
ci39135575
ci39134871
ci39128103
ci39127679
ci39126951
ci39126263
ci39126103
ci39126087
ci39126079
ci39289384
ci38253786
ci38249218
ci38237026
ci38236850
ci38235954
ci38233930
ci38922103
ci38906511
ci38847735
ci38845903
ci38840159
ci38824959
c139040408
ci39034704
ci38991056
c138624623
ci38612127
ci38605615
ci38600223
ci38639944
ci38621152
c138617824
ci38351319
ci38337167
Project No. 544-23112
4 11-901
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2019-04-11T13:05:29.520Z
2019-03-18T08:55:42.130Z
2019-03-09T15:50:32.990Z
2019-02-26T13:58:15.710Z
2019-02-13T07:38:43.600Z
2019-02-10T17:12:23.980Z
2019-01-30T08:00:48.2 60Z
2019-01-30T02 :40:12.280Z
2019-01-17T13:38:40.810Z
2019-01-09T06:04: 5 2.780Z
2019-01-03T03:32:13.770Z
2018-12-27T01:14:59.950Z
2018-12-20T20:18:22.940Z
2018-12-04T22:06:55.200Z
2018-12-03T22:44:56.920Z
2018-11-29T13:48:53.480Z
2018-11-15T06:40:26.220Z
2018-11-09T14:58:09.270Z
2018-11-09T14:45:50.680Z
2018-11-08T 17:16: 50.040Z
2018-10-17T22:09:19.450Z
2018-10-13T23:57:42.630Z
2018-10-01T17:56:19.620Z
2018-09-30T14:41:29.510Z
2018-09-20T12:44:34.520Z
2018-09-08T05 : 3 9 : 3 5.140Z
2018-09-07T10:45:38.640Z
2018-09-01T 16:50: 29.340Z
2018-08-27T19:37:27.430Z
2018-08-20T15 :44: 54.800Z
2018-08-18T16:02:05.100Z
2018-08-15T01:24:26.310Z
2018-08-04T13 :48 :49.310Z
2018-07-26T18:46:42.410Z
2018-07-23T13 :40:34.800Z
2018-06-08T20:53:48.3 5 0Z
2018-05-30T19:22:05.300Z
2018-05-19T19:26:51.100Z
2018-05-13T14:33:23.800Z
2018-05-13T12:05:47.300Z
2018-05-13T00:48:06.820Z
2018-0 5 -13T00 : 3 7 :11.100Z
2018-05-13T00:35:03.450Z
LATITUDE
34.1106667
33.5206667
33.126
33.2258333
33.4888333
33.705
34.0281667
34.4076667
33.1631667
33.1211667
33.4996667
34.4076667
33.4813333
33.4848333
33.4906667
33.014
33.157
33.4853333
33.4835
33.7793333
33.7963333
33.4898333
34.0013333
34.002
34.1016667
34.4358333
33.4828333
33.4878333
33.8978333
33.4875
34.2986667
33.4771667
33.9323333
34.0036667
33.9305
34.1145
33.9241667
33.4958333
33.0448333
33.056
33.043
33.048
33.0406667
LONGITUDE
-117.3161667
- 116.5723333
-115.9986667
-116.7473333
-116.8013333
-116.8305
- 117.2295
-116.8918333
-115.6445
- 116.0593333
-116.8078333
- 116.892
-116.799
- 116.8036667
-116.8038333
- 115.9866667
- 115.636
- 116.8048333
-116.8021667
- 116.1338333
-116.9673333
- 116.8038333
-117.0173333
-117.0178333
-117.31
- 116.899
-116.8026667
-116.8065
-116.2145
- 116.8061667
-116.9341667
-116.8033333
-116.8278333
- 117.0195
-116.8238333
-116.9236667
-116.3225
- 116.8083333
-115.9288333
- 115.9193333
- 115.9193333
- 115.9243333
-115.9205
DEPTH
16.15 2.04
10.87 10.23
6.18 16.78
16.5 1.86
2.89 3.7
2.57 1.56
4.07 1.26
2.42 10.64
3.26 1.43
2.05 7.87
14.14 2.84
15.87 16.33
15.89 2.5
1.94 2.28
7.18 2.12
3.98 1.89
6.18 16.03
5.97 3.96
8.74 2.62
1.35 1.51
2.16 1.94
2.66 MAGNITUDE
3.4 3.11
3 3.26
3 3.39
3.2 3.56
3.08 3.04
3.1 3.41
3.52 3.23
3.1 3.91
3.45 3.78
3.7 3.2
3.13 3.3
3.48 3.61
3.43 3
3.21 3.13
3.03 3.13
3.16 4.41
3.13 3.06
3.03 3.41
3.77 3.45
3.25 3.52
3.41 3.19
3.69 ID
c138542824
ci38273775
ci38261727
ci38474552
ci37530082
ci37527826
ci38211423
ci38211175
ci38195471
ci38420072
ci38414776
ci38407640
c138401064
ci38385480
ci38152023
ci38148759
ci38133927
ci38355456
ci38355352
ci38354328
ci37396426
ci37389194
ci37376114
ci37374890
ci37361730
ci38052575
ci38050879
ci38043999
ci38260864
ci38253816
ci38252192
ci38245496
ci38237088
ci38230752
ci38228176
ci38193896
ci37952751
ci37944431
ci38172320
ci38172104
ci 38171808
ci38171784
ci37186460
Project No. 544-23112
5 11-902
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2018-05-13T00:34:57.630Z
2018-05-13T00:2 8: 5 6.720Z
2018-05-08T 11:51:5 3.440Z
2018-05-08T11:49:34.020Z
2 018 -04- 2 6T01: 3 6:00.5 60Z
2018-04-25T16:52:07.860Z
2018-04-23T00:46:08.900Z
2018-04-02T02 :5 3 : 54.670Z
2018-03-16T04:08:01.540Z
2018-03-11T12:45:22.130Z
2018-02-26T18:44:41.990Z
2018-02-15T01:47:35.580Z
2018-02-11T09:02:30.140Z
2 018-01-13 T06 : 2 6 : 5 8.400Z
2017-12-30T12:15:25.490Z
2017-12-09T20:45:24.130Z
2017-12-09T02:51:24.810Z
2017 -12-07 T 10:3 2 : 4 7.160Z
2017-12-07T03:57:38.180Z
2017-12-07T00:38:03.300Z
2017-12-07T00:33:15.330Z
2017-11-10T00:23:30.180Z
2017-11-09T03:28:28.240Z
2017-10-18T10:06:00.220Z
2017-10-17T12:05:40.980Z
2017 -09-16T04: 3 9 : 2 6.2 2 0Z
2017-09-13T21:59:42.500Z
2017-08-22T08:12:34.170Z
2017-08-17T14:10:55.050Z
2 017 -08-14T 11:11:0 2.3 60Z
2017-08-09T20:40: 50.170Z
2017-07-26T19:43:57.700Z
2017-07-26T19:08:42.550Z
2017-06-25T13:53:24.760Z
2017-06-18T15:14:12.060Z
2017-06-07T07:12:35.610Z
2017-06-07T07:12:33.670Z
2017-05-29T19:00:56.330Z
2017-05-15T18:43:08.110Z
2017-05-03T15:44:55.600Z
2017-04-23T01:47:45.150Z
2017-04-20T14:54:54.830Z
2017-04-14T 14:14:34.660Z
LATITUDE
33.0446667
33.0478333
34.0176667
34.016
33.3796667
33.977
33.921
33.4925
33.9563333
33.1778333
33.4825
34.0448333
33.6528333
33.1141667
34.3155
33.4986667
33.1431667
33.147
33.1501667
33.15 33.1478333
33.462
33.4638333
33.1355
33.1341667
33.9745
33.9753333
33.9578333
33.9933333
34.286
34.2396667
33.1646667
33.1666667
34.001
33.6761667
33.8818333
33.8763333
33.5825
34.2271667
33.4838333
33.3735
34.2478333
34.0396667
LONGITUDE
-115.9178333
- 115.9186667
-116.8003333
- 116.7798333
-116.2983333
-117.2155
-116.3216667
-116.8045
-116.3191667
- 116.0291667
-116.5036667
-117.14
-117.3418333
- 116.0738333
-116.8506667
-116.8006667
-116.475
- 116.4781667
-116.4795
- 116.4816667
-116.4791667
- 116.4666667
-116.4701667
-116.6601667
- 116.6556667
- 116.9263333
-116.276
-116.6705
-116.8011667
- 117.0581667
-116.8856667
-115.6463333
-115.6446667
- 116.9018333
-116.7606667
-116.7988333
-116.8093333
- 116.6376667
-116.743
-116.801
-116.2848333
- 116.8361667
-117.2405
DEPTH
6.62 2.27
12.66 12.89
13.95 14.18
8.25 2.91
8.31 8.9
12.59 13.38
3.71 11.53
1.53 5.29
10.2 10.99
11.38 11.07
11.14 7.44
7.62 2.67
2.73 5.92
3.91 15.97
16.81 7.7
7.65 3.28
3.21 13.94
15.92 15.38
16.41 14.26
0.57 3.27
13.64 -1.07
18.23 MAGNITUDE
3.49 3.46
3.2 4.49
3.94 3.17
3.87 3.37
3.09 3.56
3.66 3.34
3.52 3.59
3.22 3.48
3.03 3.53
3.57 3
3.96 3.52
3.1 3.44
3.07 3.03
3.26 3.2
3.14 3.21
3.49 3.6
3.32 3.53
3.18 3.37
3.23 3.15
3.58 3.37
3.01 3.1
3.11 ID
ci38171768
ci38171760
ci38167864
ci38167848
ci37924223
ci37923679
ci37920791
ci37904927
ci37894911
ci37892055
ci38116288
ci 38109080
ci38106152
ci38086512
ci37841791
ci37826343
ci37825847
ci37824735
ci37824367
ci37824111
ci37824087
ci37808311
ci38039592
ci38027432
ci38026664
ci37764071
ci37762351
ci37979928
ci37976120
ci37734479
ci37730031
c137713463
ci37713415
ci37917624
ci37912624
ci37160164
ci37663687
ci37656607
ci37646015
ci37638895
ci37864616
ci37862576
ci37857344
Project No. 544-23112
6 11-903
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2017-04-14T10:38:27.740Z
2017-04-07T06:20:47.760Z
2017-03-26T08:25:44.690Z
2017-03-18T21:17:44.460Z
2017-03-17T21:54:25.470Z
2017-03-14T17:14:05.580Z
2017-03-14T05:06:54.460Z
2017-03-02T07:31:19.440Z
2017-03-01T20:18: 39.150Z
2017-02-10T10:10:32.620Z
2017-01-04T06:48:42.820Z
2016-12-28T17:56:59.830Z
2016-12-20T20:11:04.420Z
2016-10-24T01:12:32.830Z
2016-10-08T22:43:49.150Z
2016-10-05T14:11:30.240Z
2016-10-05T13 :47:47.380Z
2016-09-29T18:07:59.280Z
2016-09-28T02:33:50.330Z
2016-09-28T01:13 :03.710Z
2016-09-28T01:05 : 51.190Z
2016-09-27T05:52:50.520Z
2016-09-27T03:46:30.410Z
2016-09-27T03:39:40.620Z
2016-09-27T03:36:15.240Z
2016-09-27T03 :2 5 :06.150Z
2016-09-27T03 :24:44.710Z
2016-09-27T03:23:58.150Z
2016-09-27T03:06:14.250Z
2016-09-26T23:34:01.180Z
2016-09-26T23:33:37.160Z
2016-09-26T15 :48:40.110Z
2016-09-26T15:47:28.670Z
2016-09- 2 6 T 14: 31: 08.040Z
2016-09-26T13:14:19.430Z
2016-09-24T09:11:14.460Z
2016-09-02T15:42:14.610Z
2016-08-31T07:04:14.2 50Z
2016-08-30T 14:2 5 :10.810Z
2016-08-21T20:09 :17.840Z
2016-08-15T21:02 :16.440Z
2016-08-06T 14:3 9 :18.710Z
2016-07-30T17:22:28.540Z
LATITUDE
33.0375
34.0953333
33.2191667
34.0401667
33.1608333
33.239
34.0388333
34.058
33.1341667
34.1305
33.0683333
34.1513333
33.2233333
33.2488333
34.0075
33.1601667
33.1595
33.2873333
33.2973333
33.2988333
33.2986667
33.2906667
33.308
33.3091667
33.3058333
33.2905
33.3026667
33.2998333
33.2971667
33.2951667
33.2958333
33.2958333
33.2925
33.2976667
33.2921667
33.991
34.0831667
33.267
34.4195
33.1588333
33.9803333
33.1676667
33.196
LONGITUDE
-116.4466667
- 116.4025
-116.0825
-117.2375
-115.6328333
-116.0535
-117.2386667
-117.0008333
-115.8621667
-117.046
-116.0645
-116.7071667
-116.0878333
-116.4145
-117.2521667
-115.6421667
-115.6416667
- 115.7248333
-115.7166667
- 115.7053333
-115.7118333
-115.711
-115.6973333
-115.6933333
-115.701
- 115.7118333
-115.6945
-115.7123333
-115.716
-115.7065
-115.7056667
-115.7153333
-115.7216667
- 115.7136667
-115.7136667
-116.3896667
-116.7145
- 116.1146667
- 116.5495
- 115.6375
-116.7178333
- 116.4206667
-116.6825
DEPTH
5.73 8.88
13.36 17.71
4.84 5.15
17.64 12.76
11.51 9.67
13.73 10.92
11 4.95
14.11 2.93
3 4.83
6.9 6.85
7.03 6.74
3.1 2.54
2.52 5.03
1.85 4.84
2.99 5.63
3.23 2.47
2.74 2.2
4.34 8.65
10.69 3.09
8.06 5.52
11.53 13.76
11.85 MAGNITUDE
3.18 3
3.54 3.49
3.09 3.61
3.61 3.1
3.61 3.44
3.03 3.92
3.15 3.31
3.74 3.02
3.4 3.21
3.27 3.49
3.64 3.18
3.46 3.39
4.13 3.27
3.11 4.33
3.33 3.03
3.2 3.18
3.08 4.32
3.26 3.43
3.12 3.13
3.43 3.13
3.32 3.39
3.19 ID
ci37857232
ci37851280
ci37612599
ci37607311
ci37606335
ci37829080
ci37828544
ci37816704
ci37816152
ci37580807
ci37780256
ci37772688
ci37768032
ci37510559
ci37713424
ci37710608
ci37710576
ci37705744
ci37703656
ci37703552
ci37703504
ci37702144
ci37701656
ci37701640
ci37701632
ci37701552
ci37147076
ci37701544
ci37701512
ci37382749
ci37701312
ci37382677
ci37700544
ci37700296
ci37700208
ci37698568
ci37467503
ci37677128
ci37676560
ci37667584
ci37446943
ci37437039
ci37643624
Project No. 544-23112
7 11-904
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2016-06-20T04:21:14.710Z
2016-06-17T13:39:59.470Z
2016-06-16T17:02:02.530Z
2 016-06-11T01:40 : 3 0.9 5 0Z
2016-06-10T11:14:11.970Z
2016-06-10T08:46:46.3 20Z
2016-06-10T08:33:57.320Z
2016-06-10T08:06:22.670Z
2016-06-10T08:06:14.010Z
2016-0 6-10T08 : 0 5 : 3 5.800Z
2016-06-10T08:04:38.700Z
2016-06-02T23 :06:15.9 30Z
2016-02-20T06:13:20.330Z
2016-02-16T09:24:20.700Z
2 016-0 2 -14T0 9 : 01: 09.740Z
2016-01-09T11:43:10.820Z
2016-01-06T14:42 :34.880Z
2015-12-19T01:45:47.170Z
2015-12-18T00:21:00.930Z
2015-12-10T08:17:33.340Z
2015-12-07T14:06:09.640Z
2015-12-02T23:27:36.030Z
2015-11-27T01:21:28.040Z
2015-10-17T02:31:59.940Z
2015-10-16T05:29:51.210Z
2015-10-14T13:55:29.960Z
2015-09-16T16:10:47.340Z
2015-08-04T03 :40: 59.590Z
2015-06-09T21:58:41.530Z
2015-05-31T13:02:56.460Z
2015-05-30T05:23:56.720Z
2015-05-21T05 :06:12.800Z
2015-05-21T03 :51:01.850Z
2015-05-21T03 :15 : 29.690Z
2015-05-06T07:39:46.970Z
2015-04-19T04:35:45.650Z
2015-03-27T15:36:57.470Z
2015-03-14T11:52:19.750Z
2015-02-26T01:18:37.470Z
2015-02-07T14:05:58.270Z
2015-01-25T18:10:17.830Z
2015-01-18T13:23:43.010Z
2014-12-24T05 :51:51.440Z
LATITUDE
34.3051667
34.2021667
34.0723333
33.4598333
33.4593333
33.4578333
33.4323333
33.4436667
33.4493333
33.4425
33.4315
34.1796667
34.6098333
34.3026667
33.8916667
33.6605
33.9585
33.8371667
33.2561667
34.3206667
34.0721667
33.0265
33.792
34.1191667
33.2711667
34.197
34.1371667
34.4565
33.778
33.3135
33.8766667
33.163
33.1596667
33.1621667
33.8128333
34.0161667
33.9298333
34.5771667
33.9376667
33.2986667
32.9708333
33.3383333
33.1851667
LONGITUDE
-116.9191667
- 116.8313333
-116.3785
-116.4883333
-116.4243333
- 116.4643333
-116.4538333
-116.466
-116.4505
- 116.405
-116.4426667
-117.2931667
-116.6288333
- 116.8633333
-117.1176667
-116.7736667
-116.8883333
- 117.0478333
-115.7183333
-116.8531667
-116.671
- 116.4338333
-116.1033333
- 116.9125
-116.7896667
- 116.9068333
-116.858
-116.461
-115.7006667
- 116.2816667
- 116.1425
-115.6468333
-115.6483333
- 115.6425
-116.9795
-116.4375
-116.032
- 116.268
- 116.0285
- 116.2815
-116.4248333
- 116.3316667
-115.6085
DEPTH
1.4 7
2.43 10.81
11.2 11.87
11.43 10.78
11.91 12.74
12.31 8.68
6.7 3.14
13.61 13.63
16.67 13.88
3.33 3.51
10.46 6.89
6.62 7.23
8.53 10.11
9.55 2.79
9.949
12.769
7.04 3.39
3.16 5.74
14.86 0.006
1.214
1.059
3.176
13.162
7.877
12.289
1.387
MAGNITUDE
3.08 3.07
3.53 3.04
3.46 3.1
3.17 3.19
3.2 3.75
5.19 3.14
4.31 3.87
3.43 3.3
4.39 3.05
3.6 3.01
3.32 3.29
3.01 3.31
3.19 3.47
4 3.21
3.83 3.59
3.7 3.33
3.28 4.1
3.72 3.15
3.67 3.2
3.67 3.28
3.2 3.68
4.19 ID
ci37392719
ci37389823
ci37389015
c137380967
ci37377079
ci37375391
ci37375143
ci37374719
ci 37142124
ci37374711
ci37374687
ci37367951
ci37526424
ci37524376
ci37523696
ci375 11280
ci37510616
ci37286351
ci37285815
ci37500544
c137499408
ci37280407
ci37278167
ci37476904
ci37476536
ci37475560
ci37243591
ci37219951
ci37396400
ci37390968
ci37390168
c137166303
ci37166175
ci37166079
ci37375632
ci37147927
ci37350736
ci37338184
ci37103367
ci373 13832
ci37308936
ci37306536
ci37298672
Project No. 544-23112
8 11-905
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2014-12-23T07:59:01.450Z
2014-12-04T 16:5 3:21.19 0Z
2014-11-03T08:5 3 :3 5.480Z
2014-10-25T11:07:36.140Z
2014-10-12T20:16:04.340Z
2014-10-11T21:02 :44.800Z
2014-09-14T22:16:55.710Z
2014-09-09T16:08:30.990Z
2 014-09-0 3T0 2: 3 8: 3 5.880Z
2014-0 8-18 T04: 5 5 : 5 6.780Z
2 014-08-15T03 : 5 7 :18.800Z
2014-08-07T21:45:53.770Z
2014-07-24T19:20:14.640Z
2014-07-17T14:24:34.320Z
2014-07-15T06:07:14.190Z
2014-07-10T20:41:43.650Z
2014-07-09T21:48:04.810Z
2014-07-08T12 :31:46.080Z
2014-07-07T08:51:05.540Z
2014-07-05T17:00:26.490Z
2014-07-05T16:59:34.090Z
2014-07-03T23:50:27.720Z
2014-05-19T20:08:51.620Z
2014-05-09T04:49 : 3 3.170Z
2014-04-25T 19:2 6:08.7 60Z
2014-04-11T 2 3 : 5 3 :15.19 0Z
2014-03-05T09:17 :01.800Z
2014-01-27T12:42:38.020Z
2013-12-31T09: 21:08.640Z
2013-12-30T23:44:21.440Z
2013-12-30T18:32:35.080Z
2013-11-30T15:10:13.180Z
2013-11-30T11:36:35.770Z
2013-11-11T09:29:20.650Z
2013-10-14T12:39:20.030Z
2013-10-14T12:38:23.890Z
2013-09-29T08:41: 31.650Z
2013-09-29T00:36:16.520Z
2013-09-22T13:10:10.500Z
2013-09-20T06:10:43.370Z
2013-09-04T04:04:54.020Z
2013-08-24T23:25:52.300Z
2013-08-22T13:29:23.270Z
LATITUDE
34.0175
33.9631667
34.0175
34.2836667
34.0331667
34.0338333
33.7958333
33.78 33.7988333
34.3303333
34.3018333
33.4835
32.9038333
33.428
33.5915
33.5046667
33.2506667
33.1618333
34.2761667
34.2743333
34.2823333
33.1641667
34.2533333
33.9238333
33.9855
33.2011667
33.9296667
33.6446667
33.5015
33.7001667
33.3883333
33.0023333
33.0006667
34.018
33.204
33.2015
32.8986667
32.8973333
33.4608333
33.3406667
33.2921667
34.0113333
33.4323333
LONGITUDE
-117.228
- 116.6346667
- 117.2323333
-117.0356667
-116.3168333
- 116.6503333
- 116.9635
-116.1178333
-116.964
- 116.8301667
-116.4428333
-116.47
-116.268
- 116.4253333
-115.9128333
-116.507
-115.9816667
- 115.647
-117.0258333
- 117.0178333
-117.0266667
-115.646
-116.8248333
-116.7273333
-115.6631667
- 116.0478333
-116.347
-116.7385
-116.4773333
-116.7325
- 116.3325
- 116.4575
-116.457
- 117.2336667
- 115.677
- 115.676
-116.2815
-116.2755
- 116.6035
- 116.3905
-116.4223333
- 116.6273333
-117.0886667
DEPTH
15.909
14.651
17.149
11.351
8.628
11.085
12.184
5.721
13.127
5.943
8.737
13.298
8.053
12.766
9.878
13.904
2.906
1.938
6.866
8.094
7.25 1.818
5.531
18.095
4.435
8.704
6.042
15.085
7.984
18.208
9.98 7.563
8.813
16.617
0.923
1.603
1.956
1.116
12.223
12.836
13.378
9.315
6.748
MAGNITUDE
3.06 3.56
3.29 3.05
3.3 3.16
3.04 3.34
3.64 3.67
3.8 3.25
3.52 3.37
3.02 3.22
3.19 3.2
3.03 3.39
4.58 3.12
3.84 3.09
3.3 3.17
3.07 3.19
3.08 3.63
3.3 3.16
3.19 3.09
3 3.61
3.58 3.29
3.43 3.8
3.22 3.01
3.59 ID
ci37298432
ci37066415
ci37284704
ci37282232
ci37278432
ci37278104
ci37268056
ci37266216
ci37264024
ci37259096
ci15538561
ci15535825
ci 15530681
ci15527617
ci15526857
ci15524873
ci 15524489
ci 15523545
ci15522785
ci15520993
ci15520985
c115519497
ci15503377
c i 15499489
ci37217280
ci37210760
ci 15472609
c111418122
c111407970
c111407682
c111407610
c111397090
c111397026
c111390322
c111377986
c111377978
c111371154
c111371058
c111368274
c111366994
c111359338
ci 15396409
ci15395521
Project No. 544-23112
9 11-906
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2013-08-16T03:53:36.550Z
2013-07-22T01:59:48.050Z
2013-06-29T20:25:06.890Z
2013-06-28T17:45 :48.000Z
2013-06-24T22:09:33.190Z
2013-06-19T19:11:50.840Z
2013-06-03T 19:04:10.170Z
2013-06-03T12:43:34.550Z
2013-05-15T16:20:05.120Z
2013-04-29T17:32 :09.340Z
2013-04-25T18:59:43.990Z
2013-04-07T19:14:02.990Z
2013-03-27T18:16:59.910Z
2013-03-27T17:50:29.130Z
2013-03-13T04:21:13.690Z
2013-03-11T16:56:57.750Z
2013-03-11T16:56:06.060Z
2013-03-04T23 :17:40.750Z
2013-02-26T20:18:49.950Z
2013-02-21T20:57:39.910Z
2013-02-17T17:04:53.140Z
2013-01-17T02:10:02.470Z
2012-12-22T21:37:45.140Z
2012-12-14T23:34:39.600Z
2012-11-27T00:58:32.450Z
2012-11-26T15:33:50.700Z
2012-10-28T07:47:03.040Z
2012-10-09T13:00:02.220Z
2012-10-08T00:39 :08.340Z
2012-09-25T12:02:04.580Z
2012-09-18T21:09:39.730Z
2012-09-10T15:44:42.740Z
2012-08-26T21:17:26.720Z
2012-08-26T09:53:13.930Z
2012-08-21T02 :40:14.310Z
2012-08-19T03 :43 :46.2 60Z
2012-07-22T03:00:37.690Z
2012-07-12T17:54:28.820Z
2012-07-08T10:50:03.130Z
2012-07-05T 18:18:09.480Z
2012-07-04T09:04:43.600Z
2012-06-2 6T04:2 2 : 20.380Z
2012-06-19T04:01:38.410Z
LATITUDE
33.1851667
33.942
33.2491667
33.6245
33.739
34.0093333
33.232
33.2335
33.9795
33.1553333
33.6463333
33.8023333
33.4945
33.4953333
33.5126667
33.508
33.5008333
34.0335
34.0201667
33.2318333
33.0141667
34.0076667
32.9966667
33.8841667
34.3683333
33.0036667
33.6918333
33.7101667
33.0123333
33.1588333
33.6938333
33.2796667
34.175
33.8708333
34.2546667
33.1675
34.0893333
34.0895
33.9613333
34.304
33.3781667
34.0615
33.0751667
LONGITUDE
-115.9733333
- 116.736
-116.0046667
-116.6956667
-115.9453333
- 117.1718333
-115.6253333
-115.6251667
-116.767
- 115.642
-116.7401667
- 116.0931667
-116.443
-116.4445
-116.475
-116.4475
-116.4581667
- 117.2473333
-117.2205
-116.0563333
-116.311
- 117.1298333
-116.2388333
-115.9876667
-117.179
- 116.2348333
-116.8131667
-117.3491667
-116.3115
-115.6415
-116.7375
-115.7128333
- 115.608
- 116.1966667
-117.0731667
-115.98
-116.3923333
- 116.3913333
-116.1321667
-116.8415
-116.301
- 116.3656667
-116.0456667
DEPTH
2.504
17.275
1.839
14.381
-0.318
3.912
2.503
1.943
16.491
1.583
15.535
3.317
7.308
6.957
10.237
12.927
10.943
15.892
15.895
9.822
10.225
13.267
7.065
4.393
6.157
5.628
18.01 12.944
10.798
4.013
18.908
3.438
8.9 7.855
2.076
8.436
9.88 9.9
6.242
5.699
13.33 6.39
9.816
MAGNITUDE
3.21 3.19
3.29 3.41
3.03 3.09
3.92 3.05
3.12 3.03
3.08 3.49
3.68 3.41
3.42 3
4.7 3.47
3.56 3.63
3.36 3.05
4.02 3.49
3.41 3.57
3.87 3.35
4.16 3.12
3.02 3.25
3.9 3.31
3.03 3.4
3.17 3.86
3.27 3.51
3.36 3.31
3.25 ID
c111351394
c111337786
c111328074
c111327386
c111325466
c111321730
ci15353521
ci15353321
ci 15343017
ci 15334809
c115332633
c111281370
c111273634
c111273498
ci 15302289
ci15296289
ci 15296281
ci 15293905
c111249474
c111247690
c111245850
ci 15274169
ci 15267105
ci 15263993
c111209170
c111208786
c115237073
ci15227017
ci15226257
ci 15220681
ci 15217865
ci 15213465
usp000jqts
ci 15198697
ci 15195785
ci 15194825
ci15181601
c111135362
c111133514
c111132314
c111131698
c111127274
ci15166225
Project No. 544-23112
10 11-907
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2012-05-21T06:19 : 58.600Z
2012-05-18T10:37:12.020Z
2012-05-08T23:55:42.550Z
2012-04-24T 19:44:09.820Z
2012-04-22T16:18:33.880Z
2012-04-19T11:46:04.340Z
2012-04-12T18:53:01.260Z
2012-04-04T01:12 :09.080Z
2012-04-03T15:15:37.360Z
2012-04-01T08:2 6:12.670Z
2012-03-30T06:09:27.350Z
2012-03-28T10:09:53.450Z
2012-03-15T06:31:23.240Z
2012-03-15T06:30:34.290Z
2012-02-14T13:05:29.300Z
2012-01-08T01:5 9 : 54.080Z
2012-01-06T16:58:54.040Z
2012-01-06T0 2 :47 : 51.070Z
2011-12-26T12:32:20.430Z
2011-11-22T14:39:43.520Z
2011-11-19T20:32:33.970Z
2011-11-19T20:32:21.200Z
2011-11-14T04:59:18.120Z
2011-11-08T18:27:32.520Z
2011-10-22T21:32:59.390Z
2011-10-17T17:33:11.890Z
2011-10-05T07:36:19.320Z
2011-09-27T20:17:40.230Z
2011-09-14T14:44:51.020Z
2011-07-26T17:42:13.270Z
2011-07-15T12:03:11.960Z
2011-06-26T08:56:30.230Z
2011-06-17T17:38:51.070Z
2011-06-14T08:2 5 :40.650Z
2011-06-05T13:53:19.590Z
2011-06-03T05 :45:2 3.990Z
2011-06-02T23:38:52.130Z
2011-05-27T23:17:24.730Z
2011-04-23T20:49 : 29.810Z
2 011-04-15 T 11:48:5 6.400Z
2011-04-15T11:47:26.050Z
2011-03-31T23 :34:03.700Z
2011-03-29T10:43:24.700Z
LATITUDE
33.476
33.3195
34.1596667
33.7115
33.3218333
33.794
33.4641667
33.8576667
33.8575
33.3785
33.304
33.0071667
33.2293333
33.2281667
33.2421667
33.733
33.7306667
34.002
34.0065
33.4683333
33.246
33.2451667
33.9696667
32.9133333
32.9965
32.9966667
33.4786667
34.3096667
33.953
33.481
33.7548333
33.1725
32.998
33.6903333
33.9843333
33.6355
34.2166667
34.2216667
33.0208333
33.4623333
33.4618333
34.3218333
33.2248333
LONGITUDE
- 116.4868333
- 116.4021667
-116.4238333
-116.8401667
-116.4023333
- 116.0931667
-116.4663333
-116.1568333
- 116.1565
- 116.8525
-116.8788333
-116.4498333
-116.1016667
-116.097
-116.2516667
- 116.0571667
-116.0543333
- 116.3371667
-116.3231667
- 116.5803333
-116.2615
- 116.2651667
-117.2256667
-116.3578333
-116.401
- 116.3988333
-116.4543333
-116.9746667
-117.0758333
- 116.4916667
-116.9336667
- 115.6515
-116.3523333
-116.74
-116.5616667
-116.732
-116.7526667
- 117.0503333
-116.3176667
-116.4506667
-116.4451667
- 116.8375
-116.7566667
DEPTH
13.924
6.338
7.049
16.754
6.158
1.38 6.188
1.927
1.497
6.71 13.889
9.957
11.232
13.712
4.658
6.388
4.488
4.362
9.632
8.207
3.798
8.958
11.495
10.343
9.031
9.091
13.141
3.947
16.276
13.304
14.343
1.443
7.244
16.736
11.813
11.589
1.595
-0.271
3.684
4.258
3.468
1.256
10.018
MAGNITUDE
3.38 3.61
3.16 3.31
3.49 3.04
3.52 3.54
3.52 3
3.26 3.31
3.27 3.4
3.01 3.51
3.47 3.08
3.16 3.08
3.33 3.85
3.04 3
3.01 3.06
3.19 3.1
4.14 3.09
3.1 3.08
3.63 3.6
3.07 3.11
3.18 3.8
3.59 3
3.19 3.08
3.7 ID
ci15152625
ci15150785
c111104354
ci 15139881
ci 15138681
ci 15137489
c111092194
c111088434
c111088074
c111087194
c111086258
c111085378
c111080154
c111080146
c111066957
ci 11051197
c111050541
c111050165
c111046613
c111035389
ci37011839
c111034469
ci 15075388
ci 15073692
c111024109
ci15064500
ci 15059420
ci 15056420
c i 11006189
ci 10982077
ci15017980
ci10964829
ci 10960933
ci15001500
ci14996388
ci 14995172
ci14995068
ci14992276
ci10931805
ci 10926101
ci 10926085
ci14960740
ci14959236
Project No. 544-23112
11 11-908
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2011-03-28T04:5 6:12.000Z
2011-03-03T20:17 : 3 5.880Z
2011-02-12T17:30:43.710Z
2011-01-10T11:26:04.790Z
2011-01-03T11:38:12.410Z
2011-01-01T01:00:46.850Z
2011-01-01T00:34:10.130Z
2010-12-30T17:37:20.820Z
2010-12-28T02:52:26.530Z
2010-12-28T02:38:37.750Z
2010-12-23T03:39:35.950Z
2010-12-21T11:01:49.630Z
2010-12-10T18:44:38.350Z
2010-12-01T19:31:34.430Z
2010-11-19T00:56:54.970Z
2010-11-17T23:58:42.940Z
2010-11-17T09:46:14.540Z
2010-10-12T06:58:59.270Z
2010-10-06T17:58:06.870Z
2010-08-28T14:13:27.940Z
2010-08-27T17:32:47.970Z
2010-08-27T10:01:02.720Z
2010-08-21T13:59:45.570Z
2010-08-11T20:47:20.270Z
2010-08-06T17:39:31.670Z
2010-07-25T21:2 5 :41.400Z
2010-07-22T10:49:20.800Z
2010-07-12T05 :50: 29.240Z
2010-07-08T02:34: 3 5.980Z
2010-07-08T01:07:10.880Z
2010-07-07T23:57:23.040Z
2010-07-07T23:53:33.480Z
2010-06-18T15 :14:3 9.9 80Z
2010-06-15T16:23:44.430Z
2010-06-13 T03 :09 :20.3 60Z
2010-06-13T03 :08:5 7.090Z
2010-06-07T20:41: 3 6.510Z
2010-06-07T20:32:56.510Z
2010-06-03T 14:15 :48.880Z
2010-06-03T08:44:13.790Z
2010-05-19T07:21:34.700Z
2010-05-18T08:10:00.3 50Z
2010-05-08T13:47:03.380Z
LATITUDE
33.1873333
34.4681667
33.7043333
33.2265
33.8251667
33.1625
33.1596667
32.9916667
33.1861667
33.1883333
33.3716667
32.9193333
33.1393333
34.0166667
33.3883333
33.0036667
33.9875
33.0025
33.1468333
33.231
33.2238333
33.2255
33.8815
33.3731667
33.979
33.1575
34.4791667
33.4778333
33.4578333
33.4451667
33.391
33.4173333
33.3905
33.395
33.392
33.3833333
34.3168333
34.3165
33.2515
33.5048333
32.9938333
33.8326667
33.2666667
LONGITUDE
-115.6538333
- 116.5163333
-116.8318333
-116.7725
-116.9856667
-115.6375
- 115.6445
-116.3546667
-115.6198333
- 115.6213333
-116.4246667
- 116.2671667
-116.471
- 117.2266667
-116.418
- 116.4665
-117.1586667
- 116.4678333
-116.4916667
-115.6385
-115.6298333
-115.6425
-116.693
-116.4128333
- 116.4431667
- 116.0053333
-116.2666667
-116.442
-116.4761667
- 116.4061667
-116.4508333
-116.4746667
-116.4166667
- 116.4223333
- 116.3946667
-116.4158333
-116.8466667
- 116.8475
-116.0488333
-116.4626667
-116.3521667
- 115.5703333
-116.0476667
DEPTH
3.613
9.177
15.941
9.868
11.882
1.573
1.813
4.394
4.203
4.223
5.906
12.386
9.491
16.461
11.466
4.697
14.053
7.087
3.322
3.133
2.063
2.063
11.981
8.446
7.177
13.3 7.438
7.597
11.368
10.868
12.476
12.318
8.706
10.106
4.196
11.156
0.059
0.019
5.349
5.427
8.834
1.004
3.389
MAGNITUDE
3.42 3.42
3.62 3.11
3.3 3.16
3.52 3.8
3.58 3.78
3.17 3.36
3.91 3.22
3.75 3.68
3.16 3.17
3.94 3.26
3.57 3.17
3.59 3.38
4.05 3.8
3.07 3.3
3.4 3.01
3 5.42
3.41 3.04
4.23 4.45
3.22 3.32
3.07 3.18
3.48 3.54
3.4 ID
ci14958332
ci 10902605
ci10891517
ci 10871621
ci 10866637
ci 10865389
ci 10865293
ci10864749
ci10863557
ci10863405
c110861101
ci 10860557
ci14895084
ci 14889324
ci 14883716
ci 14883196
c110840549
ci 14859076
ci14854812
ci 10787949
ci10787509
ci 10787333
ci 10783581
ci 10775845
ci 10771621
ci10761973
ci 10758749
ci 10748837
ci10738357
ci 10737309
ci 10736101
ci 10736069
ci10715365
ci 14749724
c110701413
ci10701405
ci 14738076
ci 14738052
ci 14733300
ci 14733020
ci10672565
ci10671165
ci10657237
Project No. 544-23112
12 11-909
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2010-04-07T23:47:59.570Z
2010-04-06T18:37 :15.620Z
2010-04-05T17:28:28.760Z
2010-04-05T17:26:51.770Z
2010-04-04T23: 2 7: 2 2.600Z
2010-04-04T23 : 2 2 :04.5 60Z
2010-04-04T22 :5 6:40.430Z
2010-04-04T22 :47:5 7.980Z
2010-03-28T21:35:26.190Z
2010-03-21T15:29:59.690Z
2010-03-13T16:32:32.320Z
2010-03-11T01:39:38.810Z
2010-03-10T10:05 :09.480Z
2010-03-09T04:18: 21.870Z
2010-02-19T19:56:23.050Z
2010-02-19T19:54:28.310Z
2010-02-19T19:53:42.710Z
2010-0 2-17 T 21:3 5 : 51.180Z
2010-02-17T05:04:54.390Z
2010-02-14T06:58:27.140Z
2010-02-13T21:39:06.600Z
2010-01-23T13:17:17.010Z
2010-01-20T11:51:46.750Z
2010-01-16T12:03:25.700Z
2 010-01-12 TO 2 : 3 6 : 08.440Z
2010-01-11T23:33:52.520Z
2010-01-11T23:24:00.270Z
2009-12-31T00:17 : 5 6.3 60Z
2009-11-22T15:55:31.660Z
2009-11-18T00:44:00.600Z
2009-11-16T13:54:34.120Z
2009-11-15T07:54:22.700Z
2009-11-11T03:24:23.390Z
2009 -10- 21T 13 :17 :16.3 60Z
2009-10-16T10:03:39.830Z
2009-08-12T23 :49 :04.910Z
2009-07-26T04:54:03.590Z
2009-07-20T12:10:20.590Z
2009-06-21T14:29:33.410Z
2009-06-19T15:30:37.010Z
2009-06-14T05 :00:40.440Z
2009-04-26T05:10:27.250Z
2009-04-17T04:57 :01.500Z
LATITUDE
33.0956667
33.1458333
33.0436667
33.0451667
33.0575
33.1496667
33.1508333
32.8985
34.3516667
33.9411667
32.9906667
33.2501667
33.2496667
32.994
34.0146667
34.0123333
34.0105
34.0066667
34.0065
33.2333333
34.0045
33.1568333
32.9901667
33.9321667
33.9663333
33.9658333
33.9653333
34.0141667
34.3591667
33.1821667
33.4146667
33.9136667
33.2476667
34.1131667
33.9755
33.1 33.633
33.0995
34.1158333
33.3768333
33.1625
34.4903333
33.1978333
LONGITUDE
-115.933
- 115.9635
-116.4095
-116.4133333
-116.3838333
-116.494
-116.4823333
-116.2651667
-116.463
- 116.7361667
-116.358
-116.6886667
-116.6851667
- 116.359
-117.1841667
-117.1878333
-117.1886667
- 117.191
-117.192
-115.6995
-117.1796667
-115.6465
-116.3606667
-117.0231667
- 116.8763333
- 116.8775
-116.8771667
-117.1163333
-116.8915
-115.6115
- 116.6345
-117.059
-116.0521667
- 116.9143333
-116.9643333
- 116.2138333
-116.719
- 116.2156667
-117.3238333
-116.403
-115.6415
- 116.2376667
-115.6403333
DEPTH
2.9 12.56
13.2 13.1
13.379
12.1 10.658
13.514
3.243
13.686
4.984
3.803
3.803
4.814
6.432
6.809
6.946
7.633
7.302
3.293
8.025
2.663
4.497
13.143
8.782
9.412
8.642
10.357
1.519
2.163
6.671
12.855
3.879
8.168
13.573
8.123
12.745
11.813
17.28 12.116
4.543
4.623
5.253
MAGNITUDE
3 3.08
3.15 3.6
3.27 3.54
3.89 3.34
3.05 3.03
4.23 3.52
3.01 4.02
3.59 3.2
3.36 3.32
3.11 3.04
4.1 3.03
3.37 4.28
4.27 3.24
3.12 3.22
3.63 3.36
3.61 3.29
3.56 3.24
3.44 3.54
3.53 3.63
3.28 3.2
3.3 3.07
3.79 ID
ci 10584645
ci 14621052
c114614188
ci 14614172
ci14607916
ci14607860
ci14607748
ci14607684
ci14605532
ci 14603204
ci 14600292
ci 14598996
ci14598756
ci 14598228
c110544917
c110544901
ci 10544893
ci 10543901
ci 10543429
ci 10542293
ci10541957
ci 10533445
ci 10532501
ci10530013
ci14571828
ci14571772
ci14571732
ci14566196
ci 14547996
ci 14545820
ci10497645
c110497213
ci 10495349
ci 10483781
c110481781
ci 14499528
ci14491232
ci 10440529
ci14477816
ci 14476736
ci 14473944
ci 10400793
c110396633
Project No. 544-23112
13 11-910
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2 009 -04-16T 17:5 5:31.13 0Z
2009-04-09T21:45 : 30.670Z
2009-04-08T22 :04:02.3 60Z
2009-03-26T03:25:50.670Z
2009-03-26T03 : 2 5 : 21.980Z
2009-03-25T19:59:44.100Z
2009-03-25T07:51:23.010Z
2009-03-24T23 :43 :15.160Z
2009-03-24T13:52:51.940Z
2009-03-24T11:55:43.930Z
2009-03-21T20:40:06.200Z
2009-03-21T20:17:03.260Z
2009-03-21T20:12:18.960Z
2009-03-21T11:24:46.040Z
2009-03-13T03:42:22.160Z
2009-01-11T01:06:00.080Z
2009-01-09T04:47:40.290Z
2009-01-09T03 :49 :46.2 70Z
2008-12-10T09:40:20.150Z
2 008-12 -10T00 : 2 9 : 2 6.210Z
2008-11-23T19:39:41.810Z
2008-11-20T21:17:22.790Z
2008-11-17T17:41:37.110Z
2008-11-17T12:35:42.260Z
2008-10-30T17:09:39.530Z
2008-10-30T06:49 : 38.3 70Z
2008-10-30T03 :5 2 :43.210Z
2008-10-30T03 :49 :45.3 70Z
2008-10-30T03 :48:12.510Z
2008-10-30T03 : 2 7: 38.080Z
2 008-10-13 T05 : 3 9:48.2 2 0Z
2008-10-11T19:33:59.330Z
2008-10-02T09:41:49.2 70Z
2008-09-04T08:42 :03.740Z
2 008-08-19 T01: 5 5 :13.610Z
2008-08-03T01: 2 7 :04.510Z
2008-07-21T20:21:00.550Z
2008-06-23T14:14:57.600Z
2008-06-03T23 :06:3 3.180Z
2008-06-02T05 :13 :16.140Z
2008-05-09T22:38:08.350Z
2008-05-08T23 :44:14.9 50Z
2008-05-04T 18:16:30.280Z
LATITUDE
33.25 33.1555
33.318
33.3011667
33.293
33.292
33.29 33.3068333
33.3138333
33.3171667
33.3128333
33.3155
33.3135
33.2521667
34.0163333
34.3081667
34.0976667
34.1073333
34.1431667
34.1631667
33.0843333
34.0033333
33.4961667
33.4996667
33.5391667
33.0641667
33.0533333
33.057
33.0628333
33.0663333
33.9323333
33.6713333
34.0838333
34.0051667
33.6811667
34.0108333
34.1151667
34.0476667
33.6671667
34.0218333
33.4458333
34.0198333
33.214
LONGITUDE
- 116.4398333
- 116.5621667
-115.7226667
-115.7066667
-115.7215
- 115.7196667
-115.7213333
-115.7438333
-115.7371667
- 115.7281667
-115.7335
-115.7323333
-115.7295
-116.4385
-117.1973333
- 116.9155
-117.3056667
- 117.3041667
-116.4296667
- 117.3766667
-116.2311667
-116.9125
-116.8636667
-116.8613333
- 116.5776667
-115.91
-115.9031667
- 115.9046667
-115.9093333
- 115.9121667
-116.7421667
-116.7136667
-116.9678333
- 117.1186667
-116.8075
-117.2146667
-116.9053333
-117.2465
-116.732
-117.1433333
- 116.4555
- 117.1435
-116.725
DEPTH
2.303
13.123
4.153
5.012
7.422
6.543
4.443
5.013
4.223
6.003
4.713
4.753
4.763
2.403
14.704
5.774
14.8 13.823
6.853
7.202
5.413
16.456
10.407
10.839
11.735
2.044
1.957
1.184
1.426
0.644
13.037
15.127
11.345
12.307
13.762
10.024
4.475
14.102
14.902
5.352
9.268
5.365
8.196
MAGNITUDE
3.86 3.39
3.46 3.41
3.95 3.65
3.55 3.13
3.06 4.77
3.11 3.33
3.07 3.3
3.01 3.6
3.28 4.45
3.08 3.63
3.29 3.2
3.79 4.11
3.16 3.3
3.5 3.61
3.04 3.24
3.39 3
4.14 3.29
3.16 3.01
3.01 3.99
3.04 3.14
4.06 3.1
3.64 ID
ci 14444832
ci 14442800
ci 14442392
c110111842
ci14435776
ci14435296
ci 14434688
ci14434264
ci14433696
ci 14433456
ci14432576
ci 14432496
ci14432456
ci 14432280
ci14429152
ci 10370561
ci10370177
ci 10370141
ci 10365305
c110365237
c i 14405040
ci 14404564
ci14403792
ci14403732
ci10357093
ci10356925
c110356753
ci 10356741
ci 10356729
ci10356685
ci10353729
ci10353485
ci14396336
ci 10347025
ci 14388184
c114385368
ci 14382496
ci 14376612
ci14372916
ci14372008
ci14367532
ci 14367240
ci 14366244
Project No. 544-23112
14 11-911
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2008-05-01T03:55:35.970Z
2008-04-18T03 :2 5 : 24.750Z
2008-04-15T01: 00 :0 7.9 3 0Z
2008-03-06T00:14: 2 6.9 30Z
2008-02-25T22:59:01.670Z
2007-12-19T12:14:09.630Z
2007-11-28T15:51:55.140Z
2007-11-26T04:40:33.370Z
2007-11-25T20:30:44.220Z
2007-11-17T21:15:39.820Z
2007-10-15T21:34:08.090Z
2007-09-25T22:38:23.960Z
2007-09-12T14:21:40.500Z
2007-09-12T11:30:25.640Z
2007-09-05T15:16:47.810Z
2007-09-02T17:29:14.790Z
2007-08-30T13:08:01.110Z
2007-08-29T04:13 :48.600Z
2007-06-13T14:50:34.020Z
2007-06-02T05 :11:2 6.470Z
2007-05-17T16:05:50.400Z
2007-05-17T16:05:30.830Z
2007-04-30T05:23:52.580Z
2007-04-28T14:55:17.500Z
2007-04-28T08:04:56.950Z
2007-04-18T2 2 :2 3 :12.000Z
2007-03-02T12:10:48.090Z
2007-03-01T 14:3 7 :44.880Z
2007-02-09T03:33:44.070Z
2007-01-19T19:17:08.630Z
2007-01-18T20:04:20.300Z
2007-01-17T16:07:47.800Z
2007-01-15T07:00:03.150Z
2006-12-27T21:36:19.780Z
2006-12-25T16:56:46.950Z
2006-12-24T03 :43 : 38.860Z
2006-12-19T07:15:51.480Z
2006-12-11T08:17:35.200Z
2006-11-25T07:39:44.400Z
2006-10-09T20:26:50.860Z
2006-10-05T19:54:09.530Z
2006-10-02T15 :44:45.420Z
2006-09-18T16:25:30.180Z
LATITUDE
33.443
33.7885
34.033
34.2981667
33.3406667
34.1561667
34.4695
33.1685
34.2308333
33.512
33.7103333
33.7371667
33.7333333
33.7306667
33.7345
33.7321667
34.6046667
33.1051667
33.6965
33.8718333
33.1858333
33.1823333
33.365
33.0743333
34.1148333
33.448
33.2236667
33.2213333
33.2113333
32.9853333
32.9836667
32.9816667
33.706
33.759
33.701
33.7068333
34.3448333
34.1713333
34.3666667
33.261
33.4433333
34.3505
34.5755
LONGITUDE
- 116.454
- 116.1095
-116.4425
-116.8575
-116.3995
- 116.9813333
-116.5081667
-116.554
-116.7096667
- 116.4681667
-116.839
-117.4705
-117.484
- 117.4833333
-117.4768333
-117.477
-116.2953333
- 116.052
-116.0416667
- 116.2118333
-115.6083333
- 115.6073333
-116.3861667
-116.499
-117.3173333
- 116.5941667
-116.0186667
-116.0175
-116.148
- 116.3131667
-116.307
-116.3163333
- 116.0463333
- 116.0808333
- 116.0428333
-116.0508333
-116.753
- 116.4528333
- 116.1225
- 116.0678333
-116.5983333
- 116.461
-116.5421667
DEPTH
9.248
0.064
2.199
12.129
11.996
7.817
3.579
12.294
1.348
3.534
15.784
9.268
11.072
10.602
4.092
12.192
3.093
11.811
12.189
4.233
1.773
3.426
8.106
10.705
13.788
10.01 5.53
2.505
11.881
3.419
4.139
3.359
13.516
4.926
12.638
12.696
1.001
8.733
5.209
8.997
9.794
3.336
3.605
MAGNITUDE
4.19 3.16
3.39 3.66
3.02 4.06
3.12 3.3
3.12 3.29
3.12 3.94
3.29 3.79
3.5 4.73
3.43 3.72
3.42 4.26
3.2 3.24
3.15 3.56
3.35 3.56
3.01 3.41
4.29 3.25
3.12 3.81
3.09 3.19
3 4.11
3.06 3.02
3.48 4.01
3.18 3.07
3.08 ID
ci 10321561
ci 10318961
c110318397
ci10310701
ci14352680
ci10295849
ci14335316
ci 14334860
ci 14334816
ci14333648
ci10285401
ci14325560
ci10279441
ci 10279321
ci 10276637
ci10275733
ci 10274237
ci10273353
ci14298068
ci 14295640
ci 12290011
c110247841
ci14288180
ci14287800
ci 14287736
ci 14285852
ci14277544
ci 14277376
ci10230869
ci 10227393
ci 10227209
ci 10226877
ci10226533
ci 10224265
ci10224017
ci10223765
ci 10223081
ci10222165
ci 14262712
ci14255632
ci14254944
ci 14254376
ci10208641
Project No. 544-23112
15 11-912
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2 00 6-09-18T01: 3 3: 5 6.440Z
2006-09-07T 14:44:47.610Z
2006-09-06T22:18:01.510Z
2006-09-02T16:29 :42.040Z
2006-08-28T10:25:51.300Z
2006-08-26T21:19:55.950Z
2006-08-24T18:51: 28.770Z
2006-08-07T01:01:42.370Z
2006-08-02T16:03:02.350Z
2006-08-01T09:16: 2 2.740Z
2006-07-30T13:32:53.490Z
2006-07-23T15:58:52.450Z
2006-07-10T02: 54:43.890Z
2006-06-30T15:20:5 2.640Z
2006-06-30T01:59:39.910Z
2006-06-30T00:30:00.600Z
2006-06-30T00:2 8:06.5 60Z
2006-06-08T22 :45 : 54.810Z
2006-06-03T13:56:20.530Z
2006-05-18T10:11:52.140Z
2006-05-03T16:22:49.110Z
2006-03-24T05 :54:13.010Z
2006-03-23T23:48:57.280Z
2006-03-11T07:45 :03.640Z
2006-02-28T05:07:29.770Z
2006-02-16T03 :51:21.5 60Z
2005-12-04T17:47:44.020Z
2005-12-03T07:49:34.590Z
2005-11-25T15:40:34.860Z
2005-11-14T22:00:15.490Z
2005-11-08T22:03:46.220Z
2005-10-18T07:31:03.470Z
2005-10-18T04:08:41.5 20Z
2005-10-01T01:22:10.520Z
2005-09-11T06:07:27.560Z
2005-09-05T23:49:37.090Z
2005-09-05T08:53:53.550Z
2005-09-03T11:17:24.910Z
2005-09-02T06:44: 28.020Z
2005-09-02T03 :5 5 : 38.310Z
2005-09-02T03 :54:5 2.9 70Z
2005-09-02T03 :51:16.460Z
2005-09-02T03 :50:18.2 30Z
LATITUDE
33.1848333
33.9751667
33.1758333
33.9453333
33.1851667
34.29 33.9803333
33.243
34.111
33.2488333
33.6896667
33.73 33.856
33.2486667
33.2441667
33.2438333
33.2406667
33.9196667
33.25 34.0431667
33.5208333
33.7866667
34.5805
34.2895
33.7935
34.3401667
33.6108333
34.329
34.5963333
32.9766667
33.5275
34.0121667
34.0141667
34.0175
33.1733333
33.1711667
33.1761667
33.1783333
33.1763333
33.1598333
33.1505
33.1513333
33.1553333
LONGITUDE
-115.6118333
-117.078
-116.0436667
-116.368
-115.6096667
- 116.9056667
-116.2718333
-116.0356667
-117.3155
- 116.1283333
-116.795
- 117.4778333
-117.1121667
- 116.0278333
-116.0366667
- 116.0335
-116.036
- 116.7936667
- 116.1228333
-117.0275
-116.5853333
-116.1785
- 116.2615
-116.8281667
-116.1823333
- 116.8605
-117.2715
-116.8331667
-116.355
- 116.3173333
-116.6856667
- 116.7755
-116.7753333
- 117.1641667
-116.0441667
-115.6241667
-115.6213333
- 115.6203333
-115.6173333
-115.6478333
-115.6623333
- 115.6503333
-115.6536667
DEPTH
1.427
13.965
12.813
8.367
1.937
5.014
4.425
9.182
15.68 2.936
14.032
10.442
10.953
3.569
2.479
4.099
3.459
17.605
8.646
11.407
11.349
9.288
1.91 3.579
9.394
3.899
13.229
3.672
1.863
9.156
11.705
17.785
15.676
11.074
0.084
4.702
6.067
4.497
4.757
8.714
7.283
5.236
5.162
MAGNITUDE
3.03 3.12
3.66 3.62
3.16 3.48
3.23 3.68
3.31 3
3.16 3.69
3.9 3.43
3.03 3.07
4.37 3.87
3.04 3.24
3.1 3.66
3.11 3.53
3.15 3.24
3.42 4.17
3.05 3.4
3.36 4.42
4.1 3.04
3.77 3.17
3.83 3.1
3.44 3.11
3.37 3.05
3.16 ID
ci 10208533
ci10206813
ci10206665
ci 10205997
c i 14248808
ci 14248536
c114248144
ci10200841
ci 14244212
ci 14244008
ci 14243724
ci 14242516
ci14239184
ci14237056
ci14236828
ci 14236772
ci 14236768
ci10187953
ci 10186597
ci 10183685
c110181469
ci14218504
ci 14218424
ci14216544
ci 14214824
ci14212760
ci 14202036
ci 14201764
ci14200284
ci14198024
ci14197132
c i 10148421
ci 10148369
ci 14189148
ci 14183744
ci 14181936
ci 14181756
ci14181128
ci14180324
ci12217107
ci 14180072
ci14180064
c114180060
Project No. 544-23112
16 11-913
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2005-09-02T03 :46:48.800Z
2005-09-02T02 :46:3 5.500Z
2005-09-02T01:30:32.190Z
2005-09-02T01:27:19.590Z
2005-09-02T01:27:18.610Z
2005-09-02T01: 2 3 :43.810Z
2005-09-01T15:22:45.900Z
2005-09-01T 14:06: 31.800Z
2005-09-01T13 :50: 20.190Z
2005-09-01T13:50:09.270Z
2005-09-01T13:48:25.030Z
2005-09-01T04:29 : 2 2.050Z
2005-09-01T04:15 : 2 2.130Z
2005-08-31T23:33:38.850Z
2005-08-31T23:32:11.040Z
2005-08-31T23 :07 :16.450Z
2005-08-31T22 :5 9 :49.010Z
2005-08-31T22:47:45.530Z
2005-08-31T22:45:49.820Z
2005-08-31T22:17:14.020Z
2005-08-31T21:49:01.970Z
2005-08-31T16:18:47.610Z
2005-08-31T15:35:37.470Z
2005-08-29T07:41:40.060Z
2005-08-29T07:39:45.780Z
2005-08-26T13:45:33.340Z
2005-06-27T22:17:33.610Z
2005-06-17T03:24:28.120Z
2005-06-16T20:54:49.470Z
2005-06-16T20:54:19.950Z
2005-06-16T20:53:26.020Z
2005-06-12T20:47:47.690Z
2005-06-12T15 :41:46.5 20Z
2005-06-09T23:02:07.320Z
2005-05-21T00:39:32.690Z
2005-05-15T13:29:56.340Z
2005-04-23T02:19:07.440Z
2005-03-22T08:55:05.580Z
2005-03-13T23:43:15.300Z
2005-01-12T08:10:46.380Z
2004-12-12T05:05:52.870Z
2004-11-13T 17:3 9 :16.9 3 0Z
2004-10-27T21:41:17.000Z
LATITUDE
33.1511667
33.154
33.1588333
33.1533333
33.1748333
33.1738333
33.177
33.1976667
33.1783333
33.1693333
33.1705
33.1831667
33.1763333
33.2006667
33.1896667
33.1758333
33.168
33.1663333
33.172
33.1701667
33.1765
33.1913333
33.1885
33.2096667
33.2075
33.1725
34.0541667
33.4951667
34.0486667
34.0526667
34.058
33.5001667
33.5325
33.498
33.2235
33.4581667
34.1103333
33.28 33.3021667
33.9526667
34.1501667
34.3535
34.3435
LONGITUDE
-115.6578333
- 115.647
-115.663
-115.6463333
-115.6311667
- 115.6226667
-115.6146667
-115.6031667
-115.6328333
- 115.6311667
-115.6213333
- 115.6133333
-115.615
-115.606
-115.603
-115.618
- 115.6338333
- 115.6351667
- 115.6221667
- 115.6211667
-115.626
- 115.6006667
-115.6053333
-115.5811667
-115.5918333
- 116.0386667
-117.0305
-116.5306667
-117.0076667
- 117.0231667
-117.0113333
-116.571
-116.5666667
- 116.5246667
-116.2048333
-116.6278333
-117.307
-116.2595
-116.8513333
-116.3953333
-116.9816667
- 116.8446667
- 116.918
DEPTH
6.026
4.866
4.567
1.207
4.977
4.038
11.188
3.182
0.004
4.263
4.443
4.74 7.758
3.807
4.267
4.622
4.953
4.003
4.337
4.732
4.508
2.438
4.558
3.28 3.69
1.845
11.48 11.525
14.71 16.251
10.558
11.425
13.051
13.082
14.864
6.23 14.28
4.258
12.459
7.107
9.86 8.029
3.469
MAGNITUDE
3.23 3.76
3.41 5.08
4.5 3.03
3.03 3.29
4.48 3.65
3.68 3.01
3.2 3.79
4.57 4.2
3.11 4.63
3.62 3.16
3.26 3.38
3.76 3.1
3.25 3.09
3.96 3.34
3.39 3.65
4.88 3.05
5.2 3.07
4.06 3.17
3.35 3.7
3.45 4.26
3.71 4.19
3.79 ID
ci 14180052
ci 14179924
ci 14179740
ci14179736
ci 12217067
ci 14179728
ci 14179380
ci 14179300
ci14179292
ci 12216915
ci 14179288
ci14178764
ci14178728
ci 12217251
ci14178248
ci14178212
ci 14178204
c114178184
c114178180
ci 14178156
ci 14178132
ci 14177960
ci14177900
ci14177380
ci14177376
ci14176860
ci14158696
ci14155704
ci14155264
ci12196991
ci14155260
ci14152436
ci 14151344
ci14150888
ci14146956
ci10099817
ci10093909
ci 14133048
ci 14131672
ci 14118096
ci10066389
ci 10059745
ci 10056345
Project No. 544-23112
17 11-914
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2004-10-19T02:12:09.050Z
2004-10-03T00:32 :16.040Z
2004-09-16T 13 :2 9 :30.800Z
2004-08-23T13:2 2 :13.000Z
2004-07-15T12:20:54.010Z
2004-07-14T00:53 : 5 2.480Z
2004-06-01T14:36:14.7 60Z
2004-05-13T06:04: 28.890Z
2004-04-15T02: 2 8 :08.6 2 0Z
2004-04-08T15 :46:21.9 30Z
2004-04-05T20:38:06.550Z
2004-04-05T14:25: 2 8.910Z
2004-03-26T17:10:17.150Z
2004-03-20T04:55 : 3 7.410Z
2004-03-19T01:09:23.010Z
2004-02-27T07:37:18.440Z
2004-02-25T22:23:01.920Z
2003-12-06T13:50:28.350Z
2003-11-27T14:38:17.000Z
2003-11-23T03:06:23.380Z
2003-11-13T05:17:56.980Z
2003-11-12T20:23:09.560Z
2003-10-24T10:11:05.000Z
2003-10-15T04:18:39.570Z
2003-10-10T02:27:35.880Z
2003-10-09T07:33:55.430Z
2003-09-14T02:32:30.580Z
2003-09-10T15:27:40.240Z
2003-08-01T 19:06:49.480Z
2003-07-15T06:15:50.750Z
2003-06-13T07:52:47.330Z
2003-05-14T22:47:18.460Z
2003-04-29T02:38:40.550Z
2003-04-19T23:50:24.580Z
2003-04-10T23:03:15.560Z
2003-03-15T10:01:47.620Z
2003-03-11T19:31:31.550Z
2003-03-11T19:28:17.910Z
2003-03-02T17:59:02.410Z
2003-02-27T05:00:21.700Z
2003-02-26T01:45:28.650Z
2003-02-25T04:03 :04.800Z
2003-02-25T02:26:18.900Z
LATITUDE
33.5003333
33.2326667
34.1215
34.6706667
33.3515
33.711
34.2955
33.6463333
33.9428333
33.1008333
33.4245
34.0501667
33.2231667
33.5128333
34.3083333
34.057
33.8163333
34.0968333
33.8003333
33.6943333
33.3623333
33.9033333
33.0591667
34.0355
34.2268333
33.4098333
33.7601667
33.3165
33.3125
34.6216667
34.305
33.7491667
33.1156667
33.7948333
34.3103333
34.3056667
34.367
34.3591667
34.3258333
34.3043333
34.331
34.3155
34.3143333
LONGITUDE
-116.5113333
- 115.6996667
- 116.403
-116.3591667
-116.3721667
- 116.0556667
-116.8776667
-116.735
-116.9941667
- 115.8656667
-116.9738333
-117.2613333
-116.0808333
- 116.5768333
-116.933
-117.2583333
-117.043
- 117.308
-116.1831667
- 116.0353333
-116.4078333
- 116.9011667
-115.9086667
-116.3968333
-116.4498333
- 116.4033333
-116.0281667
-116.3601667
-115.7303333
- 116.6671667
-116.8348333
- 116.0235
-116.0736667
- 116.0881667
-116.8511667
-116.8428333
-116.132
- 116.1331667
- 116.8615
-116.843
-116.8568333
- 116.8445
-116.8506667
DEPTH
13.033
3.343
7.196
1.923
12.108
12.651
3.929
14.851
15.756
11.84 9.976
12.042
13.756
13.376
8.509
10.202
14.365
16.689
5.155
12.285
12.348
12.759
2.937
11.242
0.653
11.112
5.087
13.655
7.373
6.475
5.679
7.743
12.631
8.067
4.159
1.979
2.479
3.069
0.148
2.989
1.424
1.099
3.599
MAGNITUDE
3.23 3.1
3.63 3.16
3.03 4.02
3.06 3.05
3.35 3.2
3.42 3.29
3.16 3.1
3.49 3.08
3.58 3.39
3.47 3.09
3.31 3.26
3.14 3.36
3.52 3.06
3.05 3.12
3.04 4.15
3.15 3.87
3.34 3.17
3.28 3.59
3.4 4.64
3.01 4.04
3.63 4.61
3.03 ID
c110054541
ci 14096876
ci 14091288
ci14086916
ci 14074232
ci 14073800
ci 10014793
ci10008241
c110000605
ci9998037
ci9996961
ci9997137
ci9994217
ci9992737
ci 14039128
ci9986677
ci9986489
c i 14008004
ci 14006256
c i 14005408
ci14003372
ci 14003288
ci 13999244
ci 13997524
ci9950169
ci9949961
ci9944785
ci9944001
ci9935153
ci9930549
ci13971180
ci9915709
ci 13959680
ci9909097
ci9906629
c113947424
ci 13945912
c113945908
c113941840
ci13939856
ci 13939456
ci13938812
ci 13938688
Project No. 544-23112
18 11-915
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2003-02-24T23 :06:44.600Z
2003-02-24T04:03 : 59.9 60Z
2003-02-24T02:42:08.360Z
2003-02-23T20:28:13.590Z
2003-02-23T15:52:51.300Z
2003-02-23T09:24:23.410Z
2003-02-22T19:33:45.800Z
2003-02-22T17:50:13.320Z
2003-02-22T16:12:16.980Z
2003-02-22T14:16:08.420Z
2003-02-22T12:53:52.680Z
2003-02-22T12:48:43.930Z
2003-02-22T12:33:37.870Z
2003-02-22T12:28:36.500Z
2003-02-22T12:25:13.640Z
2003-02-22T12:25:00.320Z
2003-02-22T12:23:10.610Z
2003-02-22T12:22:39.750Z
2003-02-22T12:21:33.130Z
2003-02-22T12:20:15.640Z
2003-02-22T12:19:10.920Z
2003-02-01T17:26:52.430Z
2002-12-22T12:55:32.870Z
2002-12-03T02:59:21.480Z
2002-12-02T13:19:36.080Z
2002-12-01T17:49 :17.780Z
2002-11-27T18:48:00.950Z
2002-11-03T06:58:42.330Z
2002-10-31T23:59:37.200Z
2002-10-24T17:18:32.910Z
2002-10-22T07:15:26.070Z
2002-10-17T03:26:34.520Z
2002-09-29T17:46:08.660Z
2002-09-21T21:2 6:16.640Z
2002-09-17T15:00:05.170Z
2002-09-15T21:15:50.920Z
2002-07-31T08:31:47.980Z
2002-07-01T22:03:59.660Z
2002-05-21T19:43:08.310Z
2002-04-05T08:02:56.050Z
2002-03-30T13:50:51.710Z
2002-03-28T06:56:08.030Z
2002-03-27T13:23:08.560Z
LATITUDE
33.4453333
34.3121667
34.307
34.317
34.3048333
34.3126667
34.3096667
34.3198333
34.3135
34.3241667
34.3063333
34.3165
34.313
34.3098333
34.326
34.312
34.3403333
34.3101667
34.3108333
34.311
34.312
33.7451667
33.8851667
33.9925
33.3246667
33.7848333
34.3833333
33.1658333
33.5333333
33.5056667
34.3015
33.4821667
34.5771667
33.2248333
33.5031667
34.0543333
34.571
34.1033333
33.1583333
34.524
33.1946667
33.3501667
34.5251667
LONGITUDE
- 116.4365
- 116.8523333
-116.8325
-116.8418333
-116.8466667
- 116.8503333
-116.8503333
-116.8506667
-116.8491667
- 116.858
-116.8405
- 116.856
-116.8505
- 116.8483333
-116.8571667
- 116.8501667
- 116.8525
- 116.8475
-116.8506667
- 116.8473333
-116.8448333
- 116.0208333
- 116.2575
-116.8643333
-115.6993333
- 116.1151667
-116.4646667
-115.6416667
-116.9403333
-116.581
-116.8838333
-116.4998333
-116.2656667
- 116.1128333
-116.7786667
-116.3201667
-116.4411667
- 116.651
-115.9771667
- 116.2946667
-116.728
- 115.752
-116.2913333
DEPTH
11.722
4.549
2.039
0.739
4.249
2.109
1.409
1.779
2.709
2.549
2.969
0.549
3.864
3.839
8.087
3.229
-1.571
3.909
2.769
2.808
5.589
10.563
10.214
13.099
4.093
2.187
1.859
2.473
5.205
13.256
5.489
13.368
2.38 14.436
14.722
9.547
1.986
8.77 12.831
4.548
8.127
5.133
7.778
MAGNITUDE
3.22 3.27
3.02 3.3
3.44 3.54
4.5 3.11
3.87 4.1
3.47 3.08
3.15 3.39
4.01 3.15
3.09 3.72
4.34 4
4.99 3.25
3.48 3.02
3.29 3.06
3.37 3.25
3.07 3.83
3.58 3.09
3.08 4.31
3.73 3.31
3.73 3.33
3.88 4.39
3.84 3.03
3 ID
ci 13938592
c113938228
ci 13938172
ci 13937696
ci 13937600
c113937492
ci 13936812
c113936736
ci 13936596
ci13936432
ci13936236
ci 13936216
ci13936168
c113936152
ci 13936076
ci13936072
ci13936004
ci 13936000
ci13935996
ci13935992
ci13935988
c113930844
ci9872497
c113914868
ci13914552
c113914388
ci 13913212
ci9856273
ci9855477
ci9853417
ci9852637
ci9851505
ci9829565
ci9826789
ci13813696
ci 13813192
ci9805021
ci9796589
ci 13303428
ci9775765
ci9774569
ci9774045
ci9773785
Project No. 544-23112
19 11-916
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2002-03-23T12:27:32.700Z
2002-03-15T17:39:25.660Z
2002-03-15T16:57:56.580Z
2002-02-07T05:29:31.650Z
2002-02-04T04:39 :10.160Z
2002-01-07T03:22:02.710Z
2002-01-02T12:11:28.680Z
2002-01-01T21:23:57.560Z
2001-12-11T21:40:35.420Z
2001-12-07T20:47 :49.670Z
2001-11-23T17:06:43.490Z
2001-11-21T18:34:03.450Z
2001-11-13T21:00:40.020Z
2001-11-13T20:46:40.290Z
2001-11-13T20:43:14.950Z
2001-11-13T18:57:07.840Z
2001-11-13T16:45:04.870Z
2001-11-13T16:08:37.230Z
2001-11-13T16:03:42.790Z
2001-11-03T20:37:54.350Z
2001-11-03T19:53:56.870Z
2001-10-31T07:56:16.630Z
2001-10-30T12:58:32.730Z
2001-10-17T05:53:58.270Z
2001-10-12T16:08:40.460Z
2001-09-29T06:51:05.790Z
2001-09-23T22:44:32.960Z
2001-09-10T 17:40:08.590Z
2001-09-03T09:55:33.520Z
2001-09-01T23 :05 : 58.770Z
2001-08-28T21:30:12.220Z
2001-08-22T13:06:25.830Z
2001-08-20T07:34:23.140Z
2001-08-20T01:26:31.770Z
2001-07-22T08:13:58.030Z
2001-07-16T03 : 21: 39.5 70Z
2001-07-03T11:43:13.970Z
2001-07-03T 11:40:48.110Z
2001-06-12T12:08:23.810Z
2001-06-08T23:15:27.660Z
2001-06-05T09:3 8:46.080Z
2001-05-26T00:37:09.840Z
2001-05-23T19:10:34.500Z
LATITUDE
34.2668333
34.5215
34.5185
34.1018333
33.0466667
34.462
33.3793333
33.2645
34.1078333
34.4095
34.6133333
34.6735
33.3116667
33.3058333
33.3171667
33.3073333
33.311
33.3176667
33.3253333
34.1545
34.1616667
33.5083333
34.3515
34.6355
33.5013333
34.0483333
33.5086667
33.4518333
33.3766667
33.3716667
33.647
34.5951667
34.0435
34.6363333
34.2875
33.4618333
34.2628333
34.2635
33.6875
34.5686667
33.6776667
33.9976667
34.0238333
LONGITUDE
-116.7743333
- 116.293
- 116.2913333
-116.7086667
-116.4401667
- 116.4826667
- 116.4345
-116.1418333
-116.7233333
- 116.4655
-116.2781667
-116.2911667
-115.7056667
-115.7215
-115.7001667
-115.7113333
- 115.7038333
- 115.698
-115.6915
-116.4336667
-116.4341667
- 116.5143333
- 116.4715
-116.2336667
-116.5205
- 116.7703333
-116.5131667
-116.63
-116.4195
- 116.4166667
-116.7418333
-116.2706667
-117.2501667
- 116.3145
-116.9878333
-116.4168333
-116.7665
- 116.7641667
-116.8163333
-116.2313333
-116.7603333
- 116.5606667
-116.7571667
DEPTH
1.128
4.548
4.548
5.883
14.884
2.689
11.224
5.495
7.795
7.499
4.531
4.931
3.682
2.663
5.55 3.832
3.65 3.99
6.323
4.456
8.533
13.678
8.286
1.271
11.058
12.515
13.558
7.683
9.882
8.242
12.774
4.7 15.304
4.549
6.488
13.405
2.548
1.528
14.159
6.077
15.101
11.368
13.185
MAGNITUDE
3.4 3.07
3.43 3.38
3.58 3.15
4.21 3.03
3.62 3.38
3.23 3
3.18 3.22
4.11 3.14
3.44 3.24
3.03 3.03
3.27 5.02
3.44 3.47
3.06 3.08
3.01 3.04
3.11 3.49
3.39 3.12
3.05 3.22
3.02 3.02
3.02 3.92
3.07 3.12
3.15 3.09
3.78 ID
ci9772973
ci12619436
ci12615428
ci9758113
c112415448
ci9745753
ci9742277
ci9742149
ci9734033
ci9731517
ci9724801
ci9724453
ci9722669
ci9722637
ci9722633
ci9722577
ci9722529
ci9722489
ci9722481
ci9720229
ci9720205
ci9718013
c111743612
ci9714385
ci9713401
ci9709553
ci9708393
ci9704437
ci9700593
ci9700049
ci9698857
ci9697153
ci9696461
ci9696429
ci9682745
ci9673237
ci9666909
ci9666905
ci9660205
ci9659389
ci9658681
ci9655873
ci9655209
Project No. 544-23112
20 11-917
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME
2001-04-25T01:13 :42.790Z
2001-04-20T09:52:12.270Z
2001-04-14T05 :47 :3 7.440Z
2001-04-13T11:54:51.370Z
2001-04-10T01:47:42.070Z
2001-04-05T20: 28: 3 2.380Z
2001-04-02T 10:19:5 2.5 60Z
2001-03-14T01:19:42.090Z
2001-03-05T19:00:34.970Z
2001-03-04T07:16: 51.870Z
2001-02-20T10:36:47.850Z
2001-02-19T17:21:19.060Z
2001-02-18T06:09:32.160Z
2001-02-14T19:25:03.790Z
2001-02-13T06:11:48.410Z
2001-02-13T03 :04:3 5.640Z
2001-02-11T10:41:15.810Z
2001-02-11T07:14: 39.840Z
2001-02-11T00:39:15.970Z
2001-02-10T23:34:15.830Z
2001-02-10T21:35:08.930Z
2001-02-10T21:05:05.780Z
2001-02-10T17:50:22.380Z
2000-12-23T09:08:53.170Z
2000-12-11T18:04:27.920Z
2000-12-10T 18:2 7:09.15 0Z
2000-12-02T08:28:07.470Z
2000-09-29T09:57 : 31.850Z
2000-09-24T 18:34:40.640Z
2000-09-21T03 :06:10.650Z
2000-08-19T01:01:43.3 60Z
2000-08-17T04:43 :47.080Z
2000-06-30T09:41:00.620Z
2000-06-12T03 :15 :02.660Z
2000-05-21T06:2 7 :3 7.3 60Z
2000-05-18T15 :41:46.700Z
2000-05-16T20:45:53.670Z
2000-05-10T23:28:53.730Z
2000-05-10T23 :2 5 :42.640Z
2000-04-26T05 :3 9 :05.200Z
2000-04-2 6T05 :3 7:17.3 70Z
2000-04- 2 5 T 18:3 6: 0 7.880Z
2000-04-25T08:16:19.3 20Z
LATITUDE
34.6478333
33.7045
33.201
34.0478333
34.5363333
33.8715
33.2403333
34.6466667
33.3748333
34.0251667
33.7085
34.4868333
33.6746667
34.3006667
34.2775
34.2886667
34.2951667
34.2933333
34.2875
34.2838333
34.302
34.2895
33.8151667
34.0511667
34.009
34.09 34.2656667
33.2978333
34.45 34.5328333
33.3016667
34.366
34.043
34.683
34.294
34.671
34.6825
33.156
33.16 33.163
33.169
33.162
34.651
LONGITUDE
-116.2796667
- 116.7761667
-115.5938333
-117.1061667
-116.2668333
- 117.0241667
-116.2553333
-116.2941667
-116.3093333
- 117.0033333
-116.7756667
- 116.2583333
-116.8088333
- 116.9361667
-116.9425
-116.9418333
-116.9395
- 116.9366667
-116.9418333
- 116.9466667
-116.9313333
- 116.9458333
-116.1463333
-117.2471667
- 116.698
- 116.425
-116.7773333
-116.2338333
-116.2593333
-116.28
-116.314
-116.454
- 116.636
- 116.357
- 116.868
- 116.309
-116.3068333
- 115.643
-115.638
-115.632
- 115.634
- 115.637
- 116.299
DEPTH
4.854
15.641
2.505
5.148
4.493
12.297
8.388
4.406
12.869
10.521
15.161
4.286
15.549
3.449
4.679
4.659
4.199
3.669
6.611
5.309
4.881
7.611
7.868
15.211
11.128
6.866
1.305
12.068
4.401
1.01 12.845
1.597
11.92 6.294
4.048
1.984
3.271
2.953
4.065
6.079
4.385
4.955
-0.016
MAGNITUDE
3.26 3.4
3.03 3.08
3.17 3.16
3.47 3.19
3.13 3.18
3.06 3
3.29 3.14
3.56 3.47
3.08 3.19
4.22 3.22
3.03 4.66
3.89 3.28
3.39 3.18
4.07 3.32
3.23 3.06
3.59 3.07
3.6 3.9
3.65 3.16
3.42 3.56
3.89 3.56
3.34 3.69
3.09 ID
ci9647549
ci9645945
ci9644281
ci9644105
ci9643369
ci9642449
ci9641857
ci9634937
ci9633361
ci9633201
ci9630517
ci9630405
ci9630113
ci9629261
ci9628933
ci9628901
ci9628369
ci9628313
ci9627953
ci9627873
ci9627809
ci9627721
ci9627557
ci9171641
ci9170603
ci9170521
ci9169867
ci9164642
ci9164126
ci9163755
ci9160677
ci9160476
ci9155952
ci9153800
ci9151375
ci9151064
ci9150751
ci3324245
ci9150059
ci9148580
ci9148592
ci9148510
ci9148436
Project No. 544-23112
21 11-918
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
2000-04-22T19:08:51.330Z 34.579 -116.257 4.61 3.37 ci9148179 2000-04-22T10:25:05.870Z 34.436 -116.255 2.661 3.19 ci9148135 2000-04-21T03:32:21.950Z 34.339 -116.738 1.928 3.26 ci9148001 2000-04-07T15:24:29.700Z 34.447 -116.257 1.651 3.19 ci9146458 2000-04-05T20:38:08.770Z 34.502 -116.285 -1.052 3.24 ci9146215 2000-04-03T18:59:54.590Z 34.028 -116.324 4.338 3.61 ci9145960 2000-03-22T04:35:34.650Z 34.344 -116.465 5.596 3.16 ci9143990 2000-03-10T15:56:44.180Z 34.015 -116.312 3.928 3.33 ci9142412 2000-03-08T03:43:01.470Z 34.543 -116.308 -0.532 3.09 ci9142082 2000-03-07T10:35:39.870Z 34.328 -116.768 0.078 3.52 ci9141994 2000-02-22T03:47:24.040Z 34.0496667 -117.254 16.141 3.18 ci9140120 2000-02-21T19:35:39.560Z 34.574 -115.963 2.549 3.17 ci9140087 2000-02-21T13:49:43.130Z 34.05 -117.2525 15.051 4.37 ci9140050 2000-01-31T22:00:12.690Z 34.364 -116.134 4.036 3.48 ci9137224 2000-01-28T11:29:47.780Z 34.609 -116.29 5.117 3.1 ci3321994 2000-01-27T16:07:03.090Z 34.3941667 -116.4495 1.63 3.55 ci9136577 2000-01-20T08:03:39.530Z 34.295 -116.765 1.478 3.35 ci9135287 2000-01-15T17:16:54.650Z 34.669 -116.337 1.394 3.06 ci9134378 2000-01-13T11:04:57.840Z 34.43 -116.194 1.686 3.4 ci9133968 2000-01-13T10:07:14.840Z 34.59 -116.273 0.249 3.24 ci9133957 2000-01-12T17:13:17.400Z 34.665 -116.334 5.039 3.13 ci7172582 2000-01-03T21:59:31.780Z 34.101 -117.008 2.269 3.49 ci9132433 2000-01-02T17:58:32.820Z 34.309 -116.072 0.801 3.14 ci9132273 1999-12-31T17:43:20.030Z 34.665 -116.285 4.959 3.18 ci9131911 1999-12-30T06:24:35.110Z 34.11 -117.33 17.895 3.29 ci9131630 1999-12-29T18:12:44.150Z 34.675 -116.294 1.014 3.18 ci9131501 1999-12-24T00:43:56.860Z 34.654 -116.292 2.894 3.24 ci9130550 1999-12-23T14:30:54.380Z 34.592 -116.265 6.53 4.03 ci9130422 1999-12-22T09:16:59.300Z 34.618 -116.25 -0.89 3.16 ci9130277 1999-12-22T09:11:00.630Z 34.619 -116.251 -0.89 3.03 ci9130273 1999-12-15T13:45:02.600Z 34.608 -116.282 2.029 3.02 ci9129139 1999-12-15T06:52:05.480Z 34.335 -116.117 1.791 3.28 ci3321650 1999-12-15T06:51:03.080Z 34.333 -116.113 1.991 3.27 ci9129107 1999-12-15T06:29:48.130Z 34.101 -117.007 1.789 3.09 ci9129102 1999-12-13T13:20:16.300Z 34.1013333 -117.0086667 2.021 3.81 ci9128775 1999-12-13T05:47:38.090Z 34.389 -116.146 4.726 3.35 ci9128729 1999-12-10T08:36:42.440Z 34.589 -116.3 -1.051 3.15 ci9128326 1999-12-08T22:45:26.760Z 34.642 -116.322 2.048 3.87 ci9127950 1999-12-08T10:54:04.700Z 34.0391667 -117.2435 13.715 3.05 ci3321780 1999-12-08T10:53:59.590Z 34.043 -117.247 13.974 3.11 ci9127885 1999-12-03T22:41:04.100Z 34.62 -116.27 1.949 3.47 ci9126975 1999-12-03T05:54:55.670Z 34.662 -116.34 1.194 3.09 ci9126882 1999-11-28T02:37:28.280Z 34.628 -116.249 5.1 3.15 ci9125758 Project No. 544-23112 22
11-919
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-11-27T18:38:05.850Z 34.63 -116.2345 1.54 3.02 ci3324575 1999-11-27T18:36:46.270Z 34.669 -116.309 0.764 3.28 ci9125672 1999-11-23T15:52:33.100Z 34.41 -116.191 7.006 3.03 ci9124753 1999-11-21T22:15:38.330Z 34.6193333 -116.2488333 -0.06 3.19 ci7163776 1999-11-19T05:57:31.090Z 34.543 -116.305 -0.172 3.63 ci9123924 1999-11-16T05:52:41.040Z 34.549 -116.307 1.048 3 ci3321450 1999-11-15T11:02:24.780Z 34.42 -116.183 4.856 3.04 ci9122927 1999-11-14T19:05:25.120Z 34.489 -116.265 0.728 3.13 ci9122756 1999-11-14T00:55:00.040Z 34.437 -116.254 7.981 3.18 ci9122588 1999-11-13T14:19:49.430Z 34.159 -116.822 1.435 3.12 ci9122477 1999-11-12T05:41:22.910Z 34.0491667 -117.2641667 12.94 3.22 ci9122121 1999-11-11T01:15:40.290Z 34.6495 -116.2901667 4.464 3.15 ci7161143 1999-11-11T00:39:18.390Z 34.351 -116.464 7.196 3.51 ci9121805 1999-11-10T04:15:26.460Z 34.524 -116.287 -0.192 3.36 ci9121568 1999-11-08T16:31:19.900Z 34.601 -116.275 -0.61 3.43 ci9121111 1999-11-07T11:37:57.700Z 34.6356667 -116.3218333 1.764 3.1 ci9120783 1999-11-07T09:20:52.410Z 34.605 -116.307 -0.486 3.21 ci9120780 1999-11-06T00:12:16.660Z 34.504 -116.252 1.247 3.08 ci7159793 1999-11-05T18:02:57.520Z 34.6168333 -116.2908333 3.254 3.36 ci9120287 1999-11-03T04:37:45.490Z 34.685 -116.375 0.344 3.21 ci9119438 1999-11-03T00:32:46.870Z 34.644 -116.29 2.789 3.02 ci7158805 1999-11-02T09:08:51.580Z 34.682 -116.304 0.154 3.44 ci9119285 1999-11-01T20:19:10.670Z 33.1593333 -116.0195 5.533 3.51 ci9119111 1999-11-01T19:11:55.300Z 34.429 -116.193 2.216 3 ci9119106 1999-11-01T08:21:47.090Z 34.553 -116.263 0.79 3.27 ci9118972 1999-11-01T02:00:28.580Z 34.323 -116.118 -0.839 3.42 ci9118869 1999-11-01T01:53:46.400Z 34.305 -116.851 -1.336 3.15 ci9118857 1999-10-31T18:59:25.880Z 34.425 -116.184 2.748 3.44 ci9118682 1999-10-31T07:00:56.630Z 34.581 -116.265 -0.563 3.23 ci9118527 1999-10-29T20:57:46.910Z 34.562 -116.229 9.077 3.05 ci9118062 1999-10-29T16:22:51.240Z 34.566 -116.258 -0.123 3.52 ci9117998 1999-10-29T16:05:59.600Z 34.526 -116.241 6.427 3.47 ci9117989 1999-10-29T12:36:37.510Z 34.522 -116.273 -0.533 4.31 ci9117942 1999-10-28T22:36:15.200Z 34.509 -116.271 0.329 3.1 ci9117730 1999-10-28T17:10:45.810Z 34.537 -116.287 -0.913 3.37 ci9117629 1999-10-28T16:39:20.380Z 34.615 -116.268 -1.242 3.13 ci9117615 1999-10-28T00:42:37.130Z 34.678 -116.362 1.522 3.18 ci9117354 1999-10-27T22:35:38.910Z 34.441 -116.207 -0.082 3.39 ci9117315 1999-10-27T20:18:42.130Z 34.53 -116.279 6.047 3.08 ci9117273 1999-10-27T19:47:06.260Z 34.623 -116.263 -0.591 3.43 ci9117255 1999-10-27T08:22:38.610Z 34.617 -116.242 1.579 3.28 ci9117071 1999-10-27T03:46:26.760Z 34.67 -116.305 0.229 3.21 ci9117009 1999-10-27T03:26:43.950Z 34.555 -116.264 0.567 3.05 ci9116996 Project No. 544-23112 23
11-920
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-26T22:44:00.270Z 34.649 -116.293 2.129 3.06 ci9116913 1999-10-26T04:29:02.590Z 34.626 -116.242 -1.021 3.18 ci9116574 1999-10-26T03:51:20.510Z 34.521 -116.271 -0.474 3.29 ci9116552 1999-10-25T20:02:34.000Z 34.49 -116.266 1.029 3.69 ci9116365 1999-10-25T18:26:00.630Z 34.617 -116.243 -0.764 4.63 ci3321011 1999-10-25T18:24:45.780Z 34.53 -116.29 -0.251 3.65 ci9116355 1999-10-25T17:17:58.480Z 34.645 -116.316 -1.111 3.16 ci9116328 1999-10-25T07:20:46.230Z 34.613 -116.293 -1.084 3.03 ci9116171 1999-10-24T23:06:58.220Z 34.681 -116.321 1.539 3.12 ci9116041 1999-10-24T18:00:29.930Z 34.656 -116.308 1.259 3.03 ci9115929 1999-10-24T04:25:28.940Z 34.367 -116.194 0.858 3.36 ci9115657 1999-10-24T02:21:59.620Z 34.668 -116.289 0.949 3.48 ci9115626 1999-10-23T13:02:44.450Z 34.436 -116.261 4.42 3.09 ci9115373 1999-10-23T12:16:25.100Z 34.34 -116.136 1.871 3.19 ci3326001 1999-10-22T23:11:32.750Z 34.663 -116.284 -0.702 3.06 ci9115061 1999-10-22T22:14:32.200Z 34.6549988 -116.3388367 4.268 3.34 ci9623368 1999-10-22T16:42:38.230Z 34.582 -116.259 -1.216 3.28 ci9114854 1999-10-22T15:07:06.290Z 34.567 -116.257 -1.226 3.46 ci9114796 1999-10-22T13:42:51.890Z 34.412 -116.193 1.634 3.36 ci3321597 1999-10-22T12:40:52.530Z 34.336 -116.207 8.35 4.18 ci9114763 1999-10-22T11:34:23.650Z 34.597 -116.266 -1.169 3.79 ci3324595 1999-10-22T03:49:33.490Z 34.509 -116.269 -1.169 3.98 ci9114563 1999-10-22T01:58:43.080Z 34.564 -116.262 -1.226 3.95 ci9114515 1999-10-22T01:17:44.250Z 34.521 -116.258 -1.206 3.33 ci9114503 1999-10-21T22:57:14.700Z 34.3499985 -116.4546661 6.004 3.02 ci9619536 1999-10-21T14:59:11.900Z 34.654 -116.292 0.349 3.16 ci9114252 1999-10-21T08:14:37.400Z 34.682 -116.306 -0.806 3.23 ci9114115 1999-10-21T05:47:38.870Z 34.528 -116.27 -1.063 3.8 ci9114042 1999-10-21T04:14:29.690Z 34.644 -116.304 0.284 3.12 ci3324427 1999-10-21T02:04:05.500Z 34.3683319 -116.1920013 -0.893 3.07 ci9619012 1999-10-20T22:17:45.070Z 34.538 -116.294 -1.211 3.29 ci9113811 1999-10-20T19:47:23.890Z 34.594 -116.29 0.067 3.58 ci9113752 1999-10-20T16:40:57.010Z 34.67 -116.358 1.954 4.12 ci9113677 1999-10-20T14:21:16.510Z 34.606 -116.298 -1.216 3.08 ci9113622 1999-10-20T10:44:37.050Z 34.51 -116.326 -0.111 3.2 ci3320872 1999-10-20T08:32:44.100Z 34.569 -116.253 -1.221 3.21 ci3326713 1999-10-20T04:22:45.190Z 34.603 -116.284 -1.211 3 ci9113394 1999-10-20T02:42:39.090Z 34.593 -116.232 -1.211 3.98 ci3324589 1999-10-20T02:39:12.340Z 34.596 -116.232 -1.211 3.56 ci3324587 1999-10-20T02:26:44.370Z 34.595 -116.301 -1.211 3.02 ci9113342 1999-10-20T02:09:27.410Z 34.668 -116.354 1.892 3.39 ci3326791 1999-10-20T02:05:24.220Z 34.513 -116.252 0.079 3.23 ci9113336 1999-10-20T02:04:52.550Z 34.495 -116.21 5 3.2 usp0009g98 Project No. 544-23112 24
11-921
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-20T01:51:31.820Z 34.651 -116.339 -0.272 3.1 ci9113294 1999-10-20T00:48:39.120Z 34.603 -116.281 -1.211 3.55 ci3326785 1999-10-20T00:08:16.540Z 34.591 -116.289 -0.701 3.11 ci9113213 1999-10-19T22:21:12.820Z 34.483 -116.265 0.069 3.48 ci9113151 1999-10-19T20:48:43.180Z 34.3086662 -116.086998 4.563 3.09 ci9606928 1999-10-19T20:11:51.870Z 34.422 -116.194 2.048 3.34 ci7152609 1999-10-19T19:50:44.040Z 34.613 -116.239 -1.211 3.15 ci7152605 1999-10-19T10:39:18.890Z 34.594 -116.297 -0.301 4.14 ci3326751 1999-10-19T08:54:41.740Z 34.504 -116.25 -1.211 3.22 ci9112590 1999-10-19T08:40:35.910Z 34.436 -116.249 0.208 3.28 ci9112567 1999-10-19T04:40:05.050Z 34.659 -116.284 -1.221 3.02 ci9112379 1999-10-19T03:32:31.130Z 34.435 -116.262 -0.99 3.07 ci9112335 1999-10-19T03:32:21.130Z 34.483 -116.264 -0.273 3.19 ci3323962 1999-10-19T02:38:52.850Z 34.375 -116.191 -1.152 3.78 ci9112308 1999-10-19T00:51:33.860Z 34.368 -116.137 -0.047 3.09 ci9112165 1999-10-19T00:00:48.160Z 34.375 -116.1968333 -1.142 3.12 ci9112136 1999-10-18T21:34:18.680Z 34.2976685 -116.9639969 5.897 3.35 ci9590936 1999-10-18T21:34:15.420Z 34.085 -116.852 1.604 3.25 ci9112030 1999-10-18T21:27:16.380Z 34.664 -116.29 -0.056 3.34 ci9112019 1999-10-18T17:17:38.540Z 33.307 -116.298 9.293 3.15 ci9111807 1999-10-18T17:10:32.280Z 34.453 -116.286 -1.219 3.39 ci9111790 1999-10-18T16:44:50.360Z 34.453 -116.291 -1.211 3.65 ci9111770 1999-10-18T16:30:38.240Z 34.318 -116.071 -1.027 3.02 ci9111756 1999-10-18T16:05:11.620Z 34.654 -116.302 0.379 3.34 ci9111745 1999-10-18T13:21:22.000Z 34.325 -116.671 -1.366 3.27 ci9111606 1999-10-18T12:23:02.860Z 34.505 -116.267 -1.063 3.17 ci9111563 1999-10-18T10:17:40.520Z 34.563 -116.257 -1.063 3.66 ci9111484 1999-10-18T08:30:31.420Z 34.576 -116.294 -1.211 3.53 ci7151403 1999-10-18T07:07:36.850Z 34.509 -116.26 -0.671 3.53 ci9111372 1999-10-18T06:58:28.130Z 34.583 -116.259 -1.063 3.68 ci9111366 1999-10-18T06:35:47.360Z 34.3595 -116.1493333 -0.924 4.59 ci9111353 1999-10-18T04:42:02.020Z 34.424 -116.243 -1.162 3.05 ci9111313 1999-10-18T04:33:31.850Z 34.637 -116.297 1.569 3.17 ci9111302 1999-10-18T02:56:42.490Z 34.668 -116.276 -1.073 3.73 ci9111249 1999-10-18T00:47:48.410Z 34.617 -116.302 1.479 3.21 ci3344738 1999-10-18T00:46:11.860Z 34.336 -116.997 8.628 3.08 ci9111163 1999-10-17T23:54:46.290Z 34.3636667 -116.1443333 -0.594 3.55 ci9111114 1999-10-17T23:29:16.100Z 34.49 -116.269 -1.172 3.22 ci9111096 1999-10-17T22:56:20.400Z 34.5453333 -116.3066667 4.779 3.62 ci3321280 1999-10-17T21:52:37.480Z 34.674 -116.343 2.058 3 ci9110996 1999-10-17T20:43:15.300Z 34.434 -116.242 -1.172 3.41 ci9110952 1999-10-17T20:14:20.050Z 34.471 -116.229 -1.169 3.21 ci3320816 1999-10-17T20:14:05.470Z 34.5063333 -116.2768333 0.069 3.21 ci9110889 Project No. 544-23112 25
11-922
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-17T20:10:22.090Z 34.3426667 -116.1203333 -0.947 3.04 ci9110876 1999-10-17T19:06:44.270Z 34.5346667 -116.3565 -1.196 3.1 ci3321412 1999-10-17T19:05:22.210Z 34.6003333 -116.2356667 4.527 3.28 ci9110824 1999-10-17T18:02:56.240Z 34.6661667 -116.2948333 1.274 3.7 ci3321054 1999-10-17T17:19:11.580Z 34.521 -116.307 -1.221 3.44 ci9110733 1999-10-17T16:39:11.160Z 34.5715 -116.264 -1.063 3.01 ci9110683 1999-10-17T16:32:53.260Z 34.362 -116.138 -1.139 4.18 ci3320801 1999-10-17T16:32:40.670Z 34.3625 -116.1448333 -0.634 4.09 ci9110704 1999-10-17T16:24:07.030Z 34.4088333 -116.1981667 0.857 3.04 ci3324137 1999-10-17T16:22:48.200Z 34.3533333 -116.1425 -0.744 4.23 ci9110685 1999-10-17T15:50:36.260Z 34.345 -116.137 -0.457 3.6 ci9110665 1999-10-17T15:23:54.100Z 34.4581667 -116.2436667 -0.229 3.03 ci9110653 1999-10-17T14:59:10.570Z 34.5425 -116.2898333 4.927 3.37 ci9110631 1999-10-17T14:21:17.470Z 34.0805 -116.8568333 2.156 3.11 ci3321015 1999-10-17T14:15:51.180Z 34.648 -116.285 0.454 3.82 ci3321014 1999-10-17T12:13:58.140Z 34.478 -116.254 -1.063 3.48 ci9110439 1999-10-17T10:43:50.930Z 34.627 -116.308 -0.671 3.2 ci9110377 1999-10-17T10:41:45.690Z 34.664 -116.297 2.294 3.87 ci9110390 1999-10-17T10:37:45.260Z 34.315 -116.124 -0.384 3.03 ci9110381 1999-10-17T10:37:39.420Z 34.31 -116.124 1.011 3.27 ci3323954 1999-10-17T10:06:42.550Z 34.422 -116.207 -1.162 3.04 ci9110357 1999-10-17T09:45:57.030Z 34.612 -116.318 -1.211 3.54 ci9110340 1999-10-17T09:43:36.050Z 34.614 -116.321 -1.221 3.17 ci9110331 1999-10-17T09:09:24.900Z 34.426 -116.181 1.187 3.05 ci9110310 1999-10-17T09:04:09.640Z 34.614 -116.287 4.927 3.13 ci9110313 1999-10-17T08:44:54.050Z 34.592 -116.276 -1.211 3.21 ci9110296 1999-10-17T08:22:11.480Z 34.557 -116.258 -1.063 3.77 ci9110281 1999-10-17T07:50:22.740Z 34.667 -116.294 -0.316 3.33 ci9110259 1999-10-17T07:15:32.520Z 34.629 -116.312 -1.221 3.2 ci9110201 1999-10-17T07:09:43.080Z 34.564 -116.264 -0.599 3.15 ci9110211 1999-10-17T07:03:12.990Z 34.544 -116.311 -1.211 3.18 ci9110188 1999-10-17T05:12:22.490Z 34.501 -116.263 -1.211 3.06 ci9110139 1999-10-17T05:03:11.710Z 34.661 -116.284 -0.841 3.13 ci9110122 1999-10-17T04:58:15.850Z 34.607 -116.289 -1.211 3.59 ci9110126 1999-10-17T04:53:32.530Z 33.22 -115.622 3.138 3.2 ci9110111 1999-10-17T04:45:24.380Z 34.504 -116.281 -1.063 3.43 ci9110113 1999-10-17T04:35:22.560Z 34.678 -116.36 2.014 3.26 ci9110103 1999-10-17T04:34:25.870Z 34.463 -116.248 -1.209 3.28 ci9110097 1999-10-17T04:21:59.810Z 34.627 -116.224 -1.221 3.02 ci9110081 1999-10-17T04:02:35.070Z 34.601 -116.268 -1.043 3.01 ci9110062 1999-10-17T03:59:10.980Z 34.405 -116.171 -1.172 3.34 ci9110056 1999-10-17T02:28:57.320Z 34.537 -116.256 -1.211 3.3 ci9109846 1999-10-17T02:09:43.410Z 34.362 -116.143 -0.417 3.36 ci3321043 Project No. 544-23112 26
11-923
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-17T01:57:13.890Z 34.522 -116.286 -1.053 3.73 ci9109799 1999-10-17T01:50:35.830Z 34.673 -116.294 0.874 3.16 ci3323952 1999-10-17T01:49:39.830Z 34.423 -116.183 -0.99 3.13 ci9109793 1999-10-17T01:47:49.000Z 34.67 -116.293 1.699 3.01 ci9109776 1999-10-17T00:47:25.310Z 34.612 -116.235 4.927 3.41 ci9109763 1999-10-17T00:44:52.020Z 34.607 -116.293 -1.219 3.22 ci9109958 1999-10-17T00:36:17.540Z 34.294 -116.058 -1.027 3.41 ci9109752 1999-10-17T00:27:48.550Z 34.488 -116.242 -0.233 3.54 ci9109705 1999-10-16T23:52:10.010Z 34.6676667 -116.3183333 2.892 3.15 ci3323951 1999-10-16T23:49:33.510Z 34.542 -116.305 -1.221 3.06 ci9109676 1999-10-16T22:54:08.220Z 34.658 -116.334 -0.167 3.97 ci3321581 1999-10-16T22:25:28.220Z 34.452 -116.251 -0.942 3.22 ci3320791 1999-10-16T22:20:28.480Z 34.629 -116.328 -1.211 3 ci9109573 1999-10-16T22:13:14.480Z 34.566 -116.253 -1.064 3.04 ci9109595 1999-10-16T21:53:57.530Z 34.4281667 -116.2015 -1.152 3.25 ci9109904 1999-10-16T21:10:50.520Z 34.6698333 -116.3416667 1.654 3.94 ci9109496 1999-10-16T20:22:30.280Z 34.606 -116.308 -1.211 3.49 ci9109465 1999-10-16T20:18:58.840Z 34.5793333 -116.2713333 -1.221 3.14 ci9109421 1999-10-16T20:15:54.290Z 34.5188333 -116.1588333 4.668 3.15 ci9109402 1999-10-16T20:08:07.440Z 34.506 -116.285 -0.562 3.12 ci9109429 1999-10-16T20:07:28.690Z 34.586 -116.303 -1.156 3 ci3325088 1999-10-16T19:48:15.300Z 34.4858333 -116.2656667 -1.172 3 ci3325082 1999-10-16T19:39:55.440Z 34.674 -116.303 -0.966 3.47 ci9109876 1999-10-16T19:25:38.190Z 34.372 -116.148 -0.952 3.15 ci9109361 1999-10-16T19:25:01.350Z 34.669 -116.283 -1.221 3.1 ci9109871 1999-10-16T19:15:09.280Z 34.607 -116.28 -1.063 3.67 ci9109342 1999-10-16T18:18:39.360Z 34.659 -116.298 4.289 3.06 ci9109284 1999-10-16T18:13:07.760Z 34.589 -116.275 -1.221 3.37 ci9109281 1999-10-16T18:05:22.720Z 34.568 -116.265 -1.221 3.73 ci9109267 1999-10-16T18:01:51.730Z 34.681 -116.304 1.891 3 ci3321272 1999-10-16T17:55:16.500Z 34.532 -116.245 -0.271 3.1 ci9109260 1999-10-16T17:48:31.360Z 33.268 -115.717 0.768 3.53 ci9109243 1999-10-16T17:46:42.250Z 34.4755 -116.263 -1.183 3.2 ci3325061 1999-10-16T17:46:34.120Z 34.435 -116.216 -1.172 3 ci3325062 1999-10-16T17:38:48.650Z 34.43 -116.252 -1.162 4.58 ci9109254 1999-10-16T17:37:04.980Z 33.215 -115.646 2.179 3.09 ci9109258 1999-10-16T17:22:21.560Z 34.554 -116.25 -1.211 3.27 ci9109169 1999-10-16T17:21:55.130Z 34.605 -116.251 -1.211 3.28 ci9109230 1999-10-16T17:21:01.110Z 34.476 -116.264 -1.221 3.26 ci9112279 1999-10-16T17:20:20.740Z 34.6811667 -116.3615 1.274 3.2 ci9109232 1999-10-16T17:02:46.050Z 34.647 -116.347 -1.374 3.4 ci9109162 1999-10-16T17:02:22.760Z 34.604 -116.236 -1.162 3.2 ci3322145 1999-10-16T16:58:08.090Z 34.49 -116.27 -1.221 3 ci3321266 Project No. 544-23112 27
11-924
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-16T16:57:29.590Z 34.576 -116.271 -0.591 3.3 ci3321259 1999-10-16T16:56:28.450Z 34.5905 -116.3001667 -0.414 3 ci3321265 1999-10-16T16:55:58.580Z 33.788 -116.117 10.087 3.6 ci3321258 1999-10-16T16:54:30.880Z 34.613 -116.442 -1.379 3.28 ci3321260 1999-10-16T16:50:10.100Z 34.6783333 -116.2905 4.379 3.2 ci3321257 1999-10-16T16:38:59.860Z 34.567 -116.256 -1.211 3.17 ci9109154 1999-10-16T16:31:30.540Z 34.6663333 -116.303 0.439 3.56 ci7149405 1999-10-16T16:25:06.990Z 34.512 -116.258 4.779 3.15 ci3320777 1999-10-16T16:24:00.280Z 34.602 -116.293 4.779 3.39 ci3320776 1999-10-16T16:22:57.970Z 34.678 -116.301 -1.221 3.83 ci7149398 1999-10-16T16:12:08.610Z 34.521 -116.268 -1.211 3.61 ci9109141 1999-10-16T16:08:24.570Z 34.68 -116.309 -0.391 4.03 ci9109131 1999-10-16T16:05:00.870Z 34.425 -116.209 -1.162 3.19 ci3325059 1999-10-16T16:00:32.590Z 34.602 -116.292 4.626 3.26 ci9109120 1999-10-16T15:53:04.600Z 34.6625 -116.2958333 0.139 3.07 ci9109114 1999-10-16T15:42:29.270Z 34.51 -116.246 -1.152 3.12 ci9112208 1999-10-16T15:41:40.660Z 34.583 -116.276 -0.281 3.36 ci9109103 1999-10-16T15:38:33.420Z 34.3701667 -116.1588333 3.868 3.74 ci9109099 1999-10-16T15:31:45.860Z 34.619 -116.2995 -1.221 3.51 ci9109085 1999-10-16T15:27:10.480Z 34.487 -116.25 0.088 3.09 ci9109057 1999-10-16T15:23:50.990Z 34.383 -116.474 0.076 3 ci9109055 1999-10-16T15:21:11.570Z 34.417 -116.24 0.258 3.09 ci9109051 1999-10-16T15:18:54.200Z 34.4765 -116.2541667 -1.191 3.2 ci9109036 1999-10-16T15:11:43.710Z 34.603 -116.306 -1.211 3.3 ci9109027 1999-10-16T14:53:45.260Z 34.6645 -116.3631667 2.138 3.18 ci9112184 1999-10-16T14:52:35.030Z 34.495 -116.258 -1.162 3.74 ci9109043 1999-10-16T14:48:44.540Z 34.5286667 -116.2655 4.779 3.15 ci9109002 1999-10-16T14:44:24.300Z 34.585 -116.299 -1.374 3.49 ci9109000 1999-10-16T14:43:44.230Z 34.452 -116.233 -0.802 3.65 ci9112176 1999-10-16T14:43:11.070Z 34.461 -116.215 0.564 3.15 ci9109030 1999-10-16T14:31:52.760Z 34.4761667 -116.2705 4.828 3.06 ci9108995 1999-10-16T14:24:26.540Z 34.6500015 -116.2949982 5.844 3.05 ci9578928 1999-10-16T14:17:10.900Z 34.4878333 -116.2566667 -1.172 3.06 ci9108969 1999-10-16T14:07:05.400Z 34.3713333 -116.1371667 -0.322 3.4 ci3322136 1999-10-16T14:06:34.450Z 34.5718333 -116.244 1.589 3.46 ci9108962 1999-10-16T14:01:56.760Z 33.7941667 -116.121 5.022 3.13 ci9108953 1999-10-16T13:55:23.560Z 33.274 -115.7166667 4.402 3.52 ci9520938 1999-10-16T13:51:17.620Z 34.4505 -116.233 -1.172 4.24 ci9108964 1999-10-16T13:50:33.790Z 34.5513344 -116.3366699 4.307 3.5 ci9578860 1999-10-16T13:47:05.160Z 34.5558319 -116.2874985 4.421 3.09 ci9578856 1999-10-16T13:42:50.080Z 33.7963333 -116.1215 8.741 3.55 ci9108920 1999-10-16T13:37:02.270Z 33.8018333 -116.1186667 12.982 3.25 ci9108916 1999-10-16T13:34:56.540Z 34.6 -116.301 -1.211 3.65 ci9108915 Project No. 544-23112 28
11-925
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-16T13:32:20.930Z 34.4276667 -116.214 -1.172 3.62 ci9108902 1999-10-16T13:26:11.780Z 34.519 -116.267 -1.162 3.01 ci9108897 1999-10-16T13:25:01.560Z 34.658 -116.292 4.748 3 ci3325055 1999-10-16T13:23:54.840Z 34.604 -116.283 4.626 3.57 ci9108890 1999-10-16T13:23:09.780Z 34.34 -116.137 -0.934 3.17 ci3321255 1999-10-16T13:22:10.530Z 34.555 -116.274 -0.071 3.93 ci9108924 1999-10-16T13:14:56.470Z 34.475 -116.221 -0.951 3.17 ci9108878 1999-10-16T13:13:59.030Z 34.555 -116.243 -0.582 3.31 ci9108873 1999-10-16T13:09:09.010Z 34.433 -116.246 0.438 3.27 ci9108861 1999-10-16T13:05:20.550Z 34.6811667 -116.3058333 4.559 3.75 ci9109241 1999-10-16T12:57:21.060Z 34.4415 -116.2525 0.838 5.37 ci3320736 1999-10-16T12:55:09.650Z 34.505 -116.26 -1.171 4.42 ci9108881 1999-10-16T12:51:50.950Z 34.368 -116.132 -0.717 3.66 ci9108876 1999-10-16T12:37:19.650Z 34.5388333 -116.3048333 -1.314 3.74 ci9108864 1999-10-16T12:20:22.280Z 34.5576667 -116.267 -0.542 3.12 ci9108815 1999-10-16T12:15:08.670Z 34.6028333 -116.2885 -1.234 3.67 ci9108846 1999-10-16T12:14:11.780Z 34.6823333 -116.3628333 0.086 3.56 ci9109053 1999-10-16T12:13:03.640Z 34.624 -116.297 2.099 3.44 ci9108794 1999-10-16T12:03:34.960Z 34.6513333 -116.2966667 4.983 3.5 ci9109017 1999-10-16T11:55:37.570Z 34.444 -116.264 0.178 3.88 ci9108771 1999-10-16T11:55:31.670Z 34.564 -116.284 -1.314 3 ci3325053 1999-10-16T11:51:44.720Z 34.4708333 -116.2315 -1.064 3.45 ci9108823 1999-10-16T11:50:40.350Z 34.6781667 -116.3611667 4.484 3.2 ci9108991 1999-10-16T11:47:43.910Z 34.681 -116.347 -0.023 3.78 ci9108760 1999-10-16T11:38:50.250Z 34.506 -116.307 4.779 3.89 ci9108753 1999-10-16T11:36:38.290Z 34.5118333 -116.2776667 4.947 3 ci9108745 1999-10-16T11:27:53.760Z 34.37 -116.141 0.191 4.2 ci3323814 1999-10-16T11:24:33.920Z 34.579 -116.2938333 4.989 3 ci9108736 1999-10-16T11:21:38.720Z 34.495 -116.253 -1.162 3.87 ci9108894 1999-10-16T11:21:13.420Z 34.454 -116.247 -1.162 3 ci3321290 1999-10-16T11:20:38.180Z 34.588 -116.29 0.206 3.86 ci9108765 1999-10-16T11:20:17.000Z 34.469 -116.2601667 5.268 3.5 c110084582 1999-10-16T11:10:17.350Z 34.6461678 -116.3311691 4.081 3.59 ci9574948 1999-10-16T11:07:23.300Z 34.603 -116.294 -1.203 3.82 ci9108859 1999-10-16T11:06:38.380Z 34.583 -116.282 -1.103 4.33 ci9108750 1999-10-16T11:06:14.890Z 34.5885 -116.2836667 5.473 3 c110084578 1999-10-16T11:05:27.180Z 34.4736667 -116.3 5.707 3 ci9108743 1999-10-16T11:04:32.680Z 34.432 -116.205 4.707 3.88 ci9108687 1999-10-16T10:59:46.680Z 34.6075 -116.7435 4.51 3.14 ci9574924 1999-10-16T10:54:12.220Z 34.5205 -116.2565 4.268 3.77 ci9574908 1999-10-16T10:49:50.700Z 33.2641667 -115.6721667 6.051 3.96 ci9108673 1999-10-16T10:35:58.920Z 34.2028333 -116.3801667 4.986 3.75 ci9574888 1999-10-16T10:33:47.090Z 34.6161667 -116.3293333 6.303 4.08 ci9574884 Project No. 544-23112 29
11-926
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-10-16T10:32:24.750Z 34.3688333 -116.7536667 6.226 3.52 ci9574880 1999-10-16T10:31:15.790Z 34.6475 -116.3258333 4.43 4.04 ci9574876 1999-10-16T10:29:41.560Z 34.5265 -116.3755 8.84 4.28 c137366733 1999-10-16T10:27:10.360Z 34.2045 -116.585 5.981 3.38 ci9574864 1999-10-16T10:25:55.250Z 34.1873333 -116.5545 6.125 3.93 ci9574868 1999-10-16T10:21:20.970Z 34.54 -116.266 -0.514 4.5 ci3321286 1999-10-16T10:20:52.660Z 34.362 -116.148 -1.009 4.76 ci9108709 1999-10-16T10:18:47.900Z 34.6423333 -116.299 5.72 4.01 ci9108649 1999-10-16T10:14:35.350Z 33.8901667 -116.9215 8.297 3.33 ci9574832 1999-10-16T10:12:19.720Z 34.5036667 -116.2348333 -0.212 4.03 ci9108647 1999-10-16T10:10:48.900Z 34.6388333 -116.2865 -1.1 4.36 ci9108699 1999-10-16T10:10:33.840Z 34.594 -116.278 4.9 3 ci9108780 1999-10-16T10:09:54.620Z 34.671 -116.292 0.72 3.99 ci3320876 1999-10-16T10:06:54.560Z 34.353 -116.15 4.828 3.03 ci3327074 1999-10-16T10:04:54.100Z 34.6235 -116.2948333 4.787 4.11 ci3320857 1999-10-16T10:02:39.820Z 34.584 -116.262 -1.203 4.48 ci3320849 1999-10-16T09:59:38.000Z 34.24 -117.04 6 5.6 ci10180015 1999-10-16T09:59:35.390Z 34.6781667 -116.2895 13.906 5.77 ci3320848 1999-10-16T09:58:02.400Z 34.53 -116.26 4.787 3 ci3327080 1999-10-16T09:56:30.320Z 33.286 -115.647 2.558 4.47 ci3327072 1999-10-16T09:55:45.970Z 34.536 -116.311 4.622 4.02 ci3327071 1999-10-16T09:54:54.930Z 34.617 -116.289 1.527 4.25 ci3327070 1999-10-16T09:52:53.970Z 34.502 -116.203 4.897 4.98 ci3320847 1999-10-16T09:52:15.800Z 34.609 -116.286 4.57 4.15 ci3327069 1999-10-16T09:51:48.330Z 34.4451667 -116.2636667 -0.849 4.77 ci3320846 1999-10-16T09:50:49.150Z 34.221 -116.366 5.175 3 ci3327068 1999-10-16T09:47:43.760Z 33.232 -115.66 6.035 4.7 ci3327063 1999-10-16T09:46:44.460Z 34.6033333 -116.265 13.73 7.1 ci9108652 1999-10-16T02:41:04.690Z 34.594 -116.27 -1.063 3.7 ci9108606 1999-10-03T11:54:06.190Z 33.049 -115.902 1.326 3.32 ci9107010 1999-09-20T07:02:49.180Z 34.322 -116.846 1.494 4.12 ci9105672 1999-09-12T01:21:20.520Z 33.937 -116.359 9.007 3.17 ci9104691 1999-09-07T16:42:09.070Z 33.339 -116.209 16.551 3.35 ci9104164 1999-08-18T07:50:05.640Z 34.396 -116.469 2.646 3.09 ci9101425 1999-08-10T18:44:21.460Z 33.27 -116.005 2.426 3.45 ci9100018 1999-08-09T12:56:33.090Z 33.264 -116.001 4.146 3.26 ci9099900 1999-07-19T22:09:27.480Z 33.632 -116.717 12.904 4.15 ci9096656 1999-06-25T04:33:08.690Z 33.225 -116.013 5.686 3.12 ci9093372 1999-06-22T00:02:16.760Z 33.264 -116.004 3.345 3.06 ci9092902 1999-06-15T05:15:37.390Z 34.167 -116.441 8.696 3.02 ci9091960 1999-06-12T15:48:35.460Z 33.966 -116.407 7.797 3.07 ci9091618 1999-06-03T16:33:07.010Z 34.067 -116.365 0.916 3.69 ci9090571 1999-05-14T10:52:35.210Z 34.033 -116.359 0.926 4.15 ci3317364 Project No. 544-23112 30
11-927
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1999-05-14T10:29:33.130Z 34.068 -116.364 0.226 3.21 ci9086741 1999-05-14T09:58:40.390Z 34.064 -116.368 -0.924 3.13 ci7129519 1999-05-14T09:31:57.030Z 34.036 -116.36 -0.944 3.35 ci7129510 1999-05-14T09:19:13.800Z 34.03 -116.356 -0.934 3.14 ci7129529 1999-05-14T08:51:42.310Z 34.034 -116.364 -1.26 3.8 ci7129394 1999-05-14T08:51:30.390Z 34.043 -116.353 -0.814 3.7 ci3317344 1999-05-14T08:40:33.230Z 34.039 -116.362 0.856 3.38 ci7129392 1999-05-14T08:22:07.140Z 34.028 -116.355 0.496 3.94 ci9086693 1999-05-14T08:18:34.040Z 34.076 -116.371 1.176 3.48 ci9086688 1999-05-14T08:09:11.310Z 34.022 -116.355 -1.28 3.16 ci3317357 1999-05-14T08:01:48.820Z 34.068 -116.371 -1.28 3.08 ci3317399 1999-05-14T07:59:42.650Z 34.063 -116.374 -1.27 3.45 ci3317354 1999-05-14T07:56:07.890Z 34.056 -116.371 -0.734 3.4 ci3317352 1999-05-14T07:54:03.190Z 34.062 -116.366 1.036 4.93 ci9086596 1999-05-05T02:17:46.910Z 34.069 -116.371 0.926 3.57 ci9085734 1999-05-02T01:07:59.350Z 33.955 -116.318 6.841 3.7 ci9085336 1999-04-24T17:42:17.820Z 33.985 -116.405 2.886 3.05 ci9084570 1999-04-21T17:28:18.010Z 34.138 -116.768 9.031 3.87 ci9084273 1999-04-16T15:53:51.580Z 34.484 -116.511 1.928 3.15 ci9083778 1999-04-15T03:59:02.770Z 33.165 -115.639 1.632 3.11 ci9083589 1999-04-15T03:51:53.260Z 33.166 -115.641 0.847 3.29 ci9083580 1999-04-13T23:39:58.090Z 33.983 -116.402 2.216 3.34 ci9083436 1999-04-11T17:21:10.760Z 34.319 -116.841 5.428 3.07 ci9083137 1999-04-03T04:06:15.180Z 34.144 -116.433 2.156 3.11 ci9082400 1999-03-28T00:12:06.490Z 33.734 -117.061 10.989 3.36 ci9081930 1999-03-22T08:31:29.350Z 34.034 -117.224 16.044 3.79 ci9081410 1999-03-11T15:11:23.700Z 34.328 -116.846 3.662 3.03 ci9080321 1999-03-05T06:13:02.940Z 33.968 -116.352 7.086 3.41 ci9079844 1999-02-19T16:27:50.970Z 33.201 -115.986 5.99 3.47 ci9078766 1999-01-24T23:58:51.710Z 34.317 -116.843 3.208 3.37 ci9076749 1998-12-12T15:03:11.040Z 34.01 -116.774 18.807 3.54 ci9073452 1998-11-15T11:14:56.690Z 33.224 -116.064 13.561 3.38 ci9071640 1998-11-10T20:59:35.630Z 34.151 -116.425 9.176 3.45 ci9071348 1998-11-05T04:11:36.280Z 33.934 -116.95 6.045 3.01 ci9070922 1998-11-04T07:21:37.970Z 34.316 -116.842 3.338 3.11 ci9070822 1998-11-01T09:28:52.760Z 34.319 -116.848 4.358 3.08 ci9070553 1998-10-29T20:49:45.540Z 34.319 -116.851 3.158 3.35 ci9070300 1998-10-29T00:06:13.570Z 34.316 -116.844 3.858 3.04 ci9070227 1998-10-27T15:40:17.060Z 34.32 -116.85 2.468 4.09 ci9070083 1998-10-27T07:16:06.970Z 34.324 -116.851 2.698 3.64 ci9070033 1998-10-27T01:42:32.440Z 34.319 -116.845 3.378 3.11 ci9069988 1998-10-27T01:08:40.650Z 34.323 -116.844 4.078 4.82 ci9069997 1998-10-25T11:40:48.950Z 33.966 -117.176 13.624 3.01 ci9069870 Project No. 544-23112 31
11-928
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1998-10-01T18:18:15.960Z 34.111 -116.92 3.175 4.63 ci7112721 1998-10-01T13:59:42.690Z 34.315 -116.924 5.211 3.37 ci7112712 1998-09-10T15:43:09.780Z 33.286 -116.198 2.296 3.16 ci9066434 1998-08-31T00:08:03.200Z 34.108 -116.919 3.243 3.1 ci9065437 1998-08-23T15:42:23.720Z 34.099 -116.953 8.498 3.38 ci9064808 1998-08-17T23:18:01.700Z 34.122 -116.931 5.654 3.24 ci9064258 1998-08-17T09:44:47.140Z 34.271 -117.202 5.639 3.42 ci9064204 1998-08-16T19:05:53.620Z 34.109 -116.925 2.881 3 ci9064128 1998-08-16T13:34:40.230Z 34.121 -116.928 4.604 4.78 ci9064093 1998-07-27T13:55:41.430Z 33.947 -116.361 6.816 3.55 ci9062109 1998-07-24T18:51:41.330Z 33.149 -116.598 17.413 3.88 ci9061904 1998-07-10T21:29:13.760Z 33.224 -116.088 12.252 4.07 ci9060065 1998-07-04T11:15:48.320Z 34.636 -116.687 -0.137 3.71 ci9059472 1998-06-26T16:55:47.520Z 33.028 -115.878 3.666 3.89 ci9058311 1998-06-22T00:07:53.470Z 34.031 -116.646 11.816 3.61 ci9057907 1998-06-17T03:45:37.010Z 34.274 -116.962 8.411 3.26 ci9057512 1998-06-17T03:19:21.710Z 34.271 -116.961 8.271 3.03 ci3299987 1998-06-16T15:42:30.250Z 33.34 -116.248 14.324 3.28 ci9057477 1998-06-04T06:07:02.480Z 33.443 -116.859 11.449 3.7 ci9055663 1998-05-22T13:46:09.040Z 34.173 -117.343 10.052 3 ci9054563 1998-05-09T10:19:06.910Z 33.162 -115.642 1.213 3.09 ci9053318 1998-04-17T15:02:05.470Z 34.609 -116.628 7.903 3.6 ci9050946 1998-03-16T09:14:51.950Z 33.435 -116.422 2.471 3.01 ci9046908 1998-03-13T21:08:13.770Z 34.015 -116.78 13.546 3.08 ci9046642 1998-03-11T12:18:51.830Z 34.024 -117.23 14.421 4.45 ci3298292 1998-02-07T09:34:58.000Z 33.79 -116.974 13.9 3.1 ci9042104 1998-02-03T16:45:34.160Z 34.111 -116.914 6.095 3.47 ci9041788 1998-01-26T23:27:28.830Z 34.624 -116.672 2.793 3.16 ci9041036 1998-01-23T07:50:17.050Z 32.975 -116.449 12.391 3.15 ci9040548 1998-01-13T01:09:34.690Z 33.232 -115.577 1.892 3.85 ci9039664 1998-01-12T16:00:29.070Z 33.234 -115.569 3.28 3.22 ci9039606 1998-01-07T23:52:45.510Z 33.194 -115.603 4.542 3.4 ci3297965 1997-12-31T13:05:46.280Z 33.193 -115.61 5.558 3.1 ci9037000 1997-12-31T12:22:45.060Z 33.192 -115.608 10.282 4.07 ci9036954 1997-12-27T16:56:41.230Z 33.312 -115.695 2.003 3.53 ci9036406 1997-12-26T15:05:32.290Z 33.32 -115.689 10.193 3.68 ci9036250 1997-12-05T17:04:38.920Z 34.097 -116.996 3.069 4.08 ci9033757 1997-12-04T08:30:57.370Z 33.163 -115.655 2.472 3.44 ci9033605 1997-10-27T16:41:15.080Z 33.176 -116.039 11.362 3.17 ci9028384 1997-10-16T09:37:54.600Z 34.02 -116.749 12.199 3.12 ci9026626 1997-09-28T15:57:22.950Z 34.301 -116.452 6.543 4.42 ci9024626 1997-09-19T22:37:14.470Z 34.141 -116.856 8.674 4.11 ci9023927 1997-09-12T15:23:43.400Z 34.339 -116.874 -1.412 3.27 ci9023017 Project No. 544-23112 32
11-929
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1997-09-02T13:47:35.890Z 34.15 -117.332 7.102 3.1 ci9022103 1997-08-13T14:43:56.520Z 34.15 -117.333 5.213 3.05 ci9019721 1997-07-26T11:53:14.990Z 33.328 -116.392 9.308 3.12 ci9017634 1997-07-26T10:24:16.900Z 34.159 -117.329 8.702 3.73 ci9017623 1997-07-26T03:14:55.920Z 33.398 -116.349 11.113 4.89 ci9017527 1997-07-12T18:05:40.760Z 34.156 -117.328 9.142 3.51 ci9015982 1997-06-28T21:45:25.100Z 34.168 -117.336 8.892 4.18 ci9014489 1997-06-27T14:06:20.390Z 33.263 -116.006 3.237 3.44 ci9014370 1997-06-10T09:21:45.490Z 34.048 -117.265 14.81 3.19 ci9012932 1997-05-29T00:48:14.950Z 33.347 -116.912 6.061 3.35 ci9011839 1997-05-23T14:38:41.690Z 33.07 -116.459 12.887 3.51 ci9011379 1997-05-15T13:31:53.200Z 34.372 -116.878 2.68 3.05 ci9010627 1997-05-11T00:16:28.610Z 33.974 -116.672 15.359 3.81 ci9010203 1997-04-06T11:41:11.530Z 33.422 -116.951 10.801 3.14 ci7064394 1997-04-01T18:03:54.470Z 33.039 -116.503 2.606 3.03 ci7063953 1997-03-20T18:12:36.480Z 33.807 -116.972 12.29 3.15 ci7062796 1997-02-23T03:48:51.200Z 33.735 -116.0445 6.568 3.27 ci7060179 1997-02-23T03:44:59.220Z 33.738 -116.043 6.768 3.44 ci7060205 1997-02-23T03:43:33.280Z 33.729 -116.046 6.078 3.87 ci7060178 1997-02-07T06:59:49.340Z 33.5028333 -116.5738333 0.775 3.91 ci7058729 1997-01-18T00:11:30.710Z 34.158 -116.424 0.332 3.27 ci7056750 1997-01-17T00:31:56.500Z 33.682 -117.064 -0.696 3.4 ci3294148 1997-01-15T16:17:19.380Z 33.819 -117.001 11.8 3.3 ci7056485 1997-01-13T16:09:34.830Z 33.267 -116.01 3.569 3.87 ci7056275 1997-01-13T11:29:37.650Z 33.447 -116.901 12.531 3.76 ci7056254 1997-01-09T09:01:54.230Z 34.371 -116.463 1.556 3.12 ci7055744 1996-12-31T01:41:54.780Z 33.618 -117.278 12.234 3.16 ci3292336 1996-12-30T01:41:54.830Z 33.62 -117.278 12.134 3.05 ci7054903 1996-12-28T22:41:20.230Z 33.76 -116.89 12.34 3.95 ci7054725 1996-12-01T15:30:26.940Z 34.591 -116.618 5.83 3.06 ci7051454 1996-11-27T02:16:12.850Z 33.953 -116.313 4.123 3.26 ci7050397 1996-11-27T01:42:43.820Z 33.953 -116.314 5.38 4.46 ci7050391 1996-11-25T04:43:08.370Z 34.013 -116.945 13.138 3.42 ci7050199 1996-11-13T12:37:00.410Z 33.468 -116.453 0.133 3.74 ci7049125 1996-11-04T02:13:39.130Z 34.142 -116.429 2.132 3.06 ci7048135 1996-11-03T06:32:05.040Z 34.595 -116.28 4.779 3.41 ci7048074 1996-11-02T03:04:49.320Z 33.207 -115.704 10.788 3.17 ci7047994 1996-11-01T17:57:54.530Z 34.34 -116.45 3.786 3.39 ci7047958 1996-10-25T11:51:32.180Z 34.139 -116.407 2.672 3.42 ci7047437 1996-10-20T00:17:33.390Z 34.604 -116.278 4.779 4.16 ci7046881 1996-09-12T21:18:18.320Z 33.906 -117.145 13.385 3.84 ci7042960 1996-09-11T00:25:01.430Z 33.685 -117.066 -0.637 3.38 ci3277033 1996-08-16T13:27:42.850Z 34.606 -116.284 4.606 3 ci3274262 Project No. 544-23112 33
11-930
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1996-08-15T12:17:52.550Z 33.963 -116.888 17.079 3.29 ci3274131 1996-08-14T03:05:27.490Z 34.599 -116.28 4.779 4.3 ci3273970 1996-08-09T03:37:56.100Z 33.259 -116.287 8.852 3.33 ci3273396 1996-08-06T11:52:11.510Z 34.079 -116.782 11.383 3.26 ci3272788 1996-07-28T09:46:13.590Z 33.9893333 -116.2761667 4.523 3.36 ci3271840 1996-07-21T12:53:18.980Z 33.996 -116.814 11.269 3.34 ci3271205 1996-07-04T08:16:59.280Z 33.995 -116.298 4.658 3.46 ci3269588 1996-05-20T17:12:48.680Z 33.346 -116.222 10.654 3.4 ci3265173 1996-04-26T19:14:52.910Z 33.736 -115.922 7.149 3.31 ci3262968 1996-04-19T19:52:19.980Z 33.733 -115.919 7.299 3.22 ci3262281 1996-04-19T19:18:04.510Z 34.135 -116.854 9.424 3.1 ci3262277 1996-04-16T05:07:32.950Z 34.622 -116.564 7.19 3.13 ci3261930 1996-04-08T23:46:41.350Z 34.377 -116.46 -0.124 3.9 ci3261222 1996-04-08T15:20:49.440Z 34.378 -116.461 -0.394 3.03 ci3261157 1996-04-07T22:24:47.200Z 34.378 -116.461 -0.174 3.06 ci3261089 1996-04-02T03:47:00.350Z 33.738 -115.922 6.339 3.27 ci3260451 1996-03-09T23:20:46.570Z 34.349 -116.468 2.916 3.26 ci3257703 1996-02-21T15:54:31.960Z 34.39 -116.458 1.486 3.81 ci3255477 1996-02-19T13:08:07.890Z 34.634 -116.514 5.82 3.13 ci3255214 1996-02-09T12:14:12.660Z 34.372 -116.463 -0.514 3.58 ci3253994 1996-01-31T11:11:34.350Z 34.308 -116.455 1.378 3.25 ci3252654 1996-01-25T05:35:12.660Z 34.163 -116.446 1.067 3.57 ci3251903 1996-01-21T12:01:18.400Z 34.096 -116.445 7.297 3.24 ci3251401 1996-01-17T23:09:53.330Z 34.242 -116.829 5.463 3.42 ci3250955 1996-01-16T12:47:57.370Z 34.2198333 -116.9186667 2.114 3.07 ci3250740 1996-01-05T11:57:40.130Z 33.944 -116.368 6.425 3.84 ci3248652 1995-12-28T04:06:37.090Z 34.604 -116.632 2.55 3.08 ci3247825 1995-12-27T20:10:31.610Z 33.2 -115.604 1.558 3.1 ci3247790 1995-12-26T05:44:11.000Z 33.703 -116.767 14.116 3.25 ci3247634 1995-12-20T04:28:32.860Z 34.385 -116.455 0.186 3.39 ci3246977 1995-12-19T17:26:31.730Z 33.57 -117.103 11.279 3.25 ci3246869 1995-12-05T15:34:44.300Z 33.295 -116.322 13.604 3.08 ci3245829 1995-11-11T21:22:39.010Z 34.049 -117.266 14.673 3.01 ci3242736 1995-11-09T06:22:23.010Z 34.402 -116.473 2.386 3.21 ci3242385 1995-10-22T14:41:03.750Z 34.138 -116.433 1.447 3.85 ci3239495 1995-10-11T17:37:03.970Z 33.246 -116.128 13.713 3.47 ci3237662 1995-09-23T16:03:52.010Z 34.251 -116.436 1.877 3.45 ci3233047 1995-09-09T08:08:16.270Z 34.156 -116.434 6.177 3.48 ci3229998 1995-09-05T21:47:52.060Z 34.178 -116.429 -0.403 3.01 ci3229665 1995-09-05T20:27:18.420Z 34.199 -116.438 -0.893 4.44 ci3229496 1995-08-19T04:01:26.810Z 33.404 -116.433 12.534 3.1 ci3225827 1995-08-15T16:03:46.670Z 34.17 -116.459 8.477 3.4 ci3224779 1995-08-15T05:17:46.880Z 33.781 -116.922 11.444 3 ci3224709 Project No. 544-23112 34
11-931
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1995-08-12T09:57:53.440Z 33.985 -116.904 8.943 3.25 ci3224351 1995-07-28T07:07:30.390Z 33.541 -116.69 7.808 3.64 ci3222372 1995-07-13T15:39:00.020Z 34.014 -116.326 4.654 3.12 ci3219392 1995-06-28T21:29:09.130Z 34.356 -116.904 2.829 3.02 ci3217948 1995-06-17T07:56:38.350Z 34.65 -116.658 3.28 3.19 ci3216711 1995-06-09T19:44:04.390Z 33.273 -116.812 13.165 3.38 ci3215805 1995-05-30T01:44:56.120Z 33.5 -116.824 12.981 3.13 ci3214808 1995-05-21T19:50:50.450Z 33.81 -116.988 10.68 3.02 ci3213726 1995-05-13T02:25:22.140Z 33.975 -116.974 13.758 3.73 ci3212848 1995-05-07T22:05:26.940Z 33.905 -116.297 8.763 3.05 ci3212318 1995-05-07T11:03:33.040Z 33.905 -116.288 10.123 4.77 ci3212249 1995-04-20T21:38:41.870Z 34.302 -116.912 4.849 3.21 ci3210509 1995-04-14T18:28:26.050Z 34.228 -116.763 5.463 3 ci3209988 1995-04-11T15:56:23.100Z 33.906 -116.291 8.713 3.41 ci3209640 1995-04-10T14:01:32.670Z 34.412 -116.47 2.356 3.66 ci3209506 1995-04-09T23:01:08.490Z 34.04 -116.322 7.498 3.29 ci3209441 1995-04-07T03:17:51.870Z 34.365 -116.47 -0.114 3.1 ci3209212 1995-04-04T06:26:49.820Z 34.054 -117.259 17.503 3.48 ci3208879 1995-03-27T16:26:29.920Z 33.988 -116.441 7.699 3.28 ci3208087 1995-03-18T08:30:14.830Z 34.03 -116.955 10.453 3.21 ci3207055 1995-02-27T16:36:39.590Z 34.051 -116.435 1.991 3.13 ci3204908 1995-02-26T20:02:13.550Z 34.377 -116.46 0.086 3.2 ci3204787 1995-02-22T04:27:57.660Z 34.146 -116.429 1.598 3.11 ci3203881 1995-02-19T15:47:58.240Z 34.322 -116.879 7.504 3.5 ci3203622 1995-01-24T11:57:28.990Z 33.941 -117.346 14.978 3.48 ci3201076 1995-01-23T07:58:53.400Z 34.307 -116.863 1.853 3.11 ci3200990 1995-01-22T16:11:41.600Z 34.306 -116.86 2.513 3.23 ci3200927 1995-01-12T22:50:45.860Z 34.009 -116.322 4.804 3.1 ci3199907 1994-12-13T17:51:44.410Z 34.126 -116.883 8.849 3.28 ci3196638 1994-11-25T22:32:08.090Z 34.125 -116.425 5.809 3.14 ci3194605 1994-11-20T04:31:43.450Z 34.012 -116.319 5.495 4.21 ci3193347 1994-11-16T02:52:42.320Z 34.071 -117.187 10.119 3.36 ci3192849 1994-11-12T11:50:28.530Z 34.361 -116.459 0.096 3.56 ci3192274 1994-11-09T02:29:04.320Z 33.68 -116.797 16.596 3.72 ci3191862 1994-11-07T18:32:20.610Z 33.701 -116.764 14.406 3.76 ci3191683 1994-11-07T18:04:42.640Z 34.339 -116.823 5.425 3.01 ci3191682 1994-10-31T00:45:23.970Z 34.374 -116.455 1.606 3.41 ci3190827 1994-10-24T15:17:56.080Z 34.265 -116.458 -0.9 3.33 ci3189808 1994-10-19T20:04:50.910Z 34.449 -116.499 1.747 3.09 ci3188924 1994-10-09T04:10:07.450Z 33.231 -116.1 11.363 3.88 ci3187666 1994-09-21T22:15:06.490Z 33.527 -116.522 5.326 3.13 ci3185616 1994-09-12T00:16:59.620Z 33.764 -116.952 14.09 3.52 ci3184085 1994-08-30T15:59:57.770Z 34.15 -116.428 5.097 3.11 ci3182675 Project No. 544-23112 35
11-932
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1994-08-21T12:52:40.730Z 34.592 -116.617 2.75 3.58 ci3181488 1994-08-20T20:22:55.190Z 33.377 -116.385 9.694 3.15 ci3181408 1994-08-15T08:08:24.440Z 33.808 -116.205 6.615 3.32 ci3180677 1994-08-15T08:07:32.860Z 33.812 -116.201 6.315 3.82 ci3180612 1994-08-11T16:49:51.110Z 34.15 -116.447 7.907 3.04 ci3180075 1994-08-07T23:43:32.880Z 33.992 -116.274 6.865 3.6 ci3179575 1994-08-07T15:10:25.960Z 33.992 -116.274 6.225 3.95 ci3179522 1994-08-01T21:34:31.120Z 34.64 -116.517 7.93 4.85 ci3178681 1994-07-28T10:52:02.510Z 33.403 -116.944 4.261 3.23 ci3178069 1994-07-11T14:34:10.580Z 34.631 -116.61 3.25 3.2 ci3175602 1994-06-29T07:34:35.210Z 34.273 -116.411 0.07 3.53 ci3174154 1994-06-28T22:03:09.610Z 33.368 -116.393 7.584 3.18 ci3174102 1994-06-24T20:20:59.720Z 34.368 -116.901 1.369 3.07 ci3173702 1994-06-16T16:24:27.530Z 34.268 -116.402 2.52 4.97 ci3172554 1994-06-15T14:13:52.510Z 34.337 -116.469 3.536 3.14 ci3172420 1994-05-31T03:03:34.430Z 33.202 -116.049 3.333 3.42 ci3169866 1994-05-26T22:26:59.140Z 34.109 -117.323 16.885 3.43 ci3169324 1994-05-24T15:41:45.640Z 34.624 -116.554 6.81 3.02 ci3168927 1994-04-06T19:01:04.060Z 34.192 -117.095 5.726 4.78 ci3162132 1994-04-06T07:27:36.470Z 34.478 -116.516 4.81 3.26 ci3162117 1994-04-06T07:26:01.230Z 34.477 -116.515 7.38 3.71 ci3162056 1994-04-05T15:17:50.660Z 34.011 -117.105 8.304 3.02 ci3161935 1994-04-04T03:25:44.410Z 33.441 -116.853 12.841 3.35 ci3161717 1994-03-28T06:18:38.390Z 33.35 -116.358 11.484 3.26 ci3160727 1994-03-14T22:22:09.180Z 34.033 -117.251 14.413 3.03 ci3158448 1994-03-07T09:11:36.390Z 34.622 -116.606 4.484 3.69 ci3157117 1994-03-02T03:35:37.940Z 34.193 -116.441 -0.835 3.33 ci3155989 1994-02-28T05:40:07.610Z 34.203 -116.437 2.495 3.43 ci3155943 1994-02-09T15:47:47.990Z 33.467 -116.451 6.113 3.48 ci3150798 1994-02-06T03:15:54.050Z 34.569 -116.412 4.81 3.25 ci3149968 1994-01-29T15:00:59.580Z 34.64 -116.663 4.792 3.09 ci3147325 1994-01-27T18:57:10.880Z 34.406 -116.509 0.61 3.4 ci3146645 1994-01-14T10:35:53.160Z 34.042 -117.097 15.792 3.08 ci3140330 1994-01-13T11:51:44.210Z 33.231 -116.037 2.494 3.08 ci3140226 1994-01-02T13:19:17.630Z 33.701 -117.024 11.001 3.88 ci3138869 1994-01-01T17:47:31.540Z 34.388 -117.016 7.009 3.46 ci3138805 1993-12-23T00:28:06.890Z 34.148 -116.433 4.327 3.06 ci3137418 1993-12-17T22:55:38.610Z 34.58 -116.568 6.457 3.02 ci3136769 1993-12-10T10:10:10.500Z 34.018 -117.109 7.312 3.19 ci3135799 1993-12-03T01:51:24.750Z 34.259 -116.722 -0.358 3.84 ci3134575 1993-11-25T20:27:06.860Z 34.086 -116.425 8.177 3.05 ci3133608 1993-11-04T23:15:38.650Z 34.621 -116.662 4.791 3.28 ci3130544 1993-11-04T00:36:53.740Z 33.824 -115.658 -0.667 3.4 ci3130427 Project No. 544-23112 36
11-933
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1993-10-30T11:30:00.060Z 34.014 -117.012 5.267 3.01 ci3129879 1993-10-29T09:11:34.590Z 33.19 -115.609 6.409 3.1 ci3129681 1993-10-19T02:40:29.070Z 34.198 -116.433 4.847 3.37 ci3127836 1993-10-15T18:57:09.440Z 34.242 -116.426 1.637 3.05 ci3127281 1993-10-11T01:35:53.340Z 33.254 -116.234 8.837 3.04 ci3126422 1993-10-08T18:30:01.090Z 34.388 -116.464 4.206 3.51 ci3125934 1993-10-04T02:57:36.700Z 34.013 -116.343 0.885 3.45 ci3125013 1993-09-14T14:49:03.630Z 34.383 -116.459 -0.054 3.32 ci3122252 1993-09-14T08:18:57.700Z 34.016 -116.318 2.325 3.25 ci3122158 1993-09-14T04:29:13.580Z 34.383 -116.455 0.155 3.29 ci3122130 1993-09-10T15:56:35.410Z 34.358 -116.455 6.566 3.02 ci3121732 1993-09-10T03:38:05.160Z 34.421 -116.472 1.266 3 ci3121671 1993-09-07T16:41:52.570Z 34.268 -116.451 -0.7 3.54 ci3121150 1993-09-07T09:43:17.960Z 34.167 -116.433 6.417 3.22 ci3121033 1993-09-06T08:25:23.060Z 34.141 -116.837 8.135 3.94 ci3120810 1993-08-21T01:46:38.400Z 34.029 -116.321 8.245 5 ci3118441 1993-08-16T09:12:16.070Z 34.6 -116.629 2.621 3.3 ci3117713 1993-08-14T02:09:11.040Z 34.001 -117.191 14.637 3.03 ci3117458 1993-08-11T16:13:44.120Z 34.178 -116.43 3.937 3.12 ci3117122 1993-08-09T01:55:00.560Z 34.013 -117.105 7.322 3.01 ci3116768 1993-08-08T01:24:47.820Z 34.512 -116.527 3.968 3.09 ci3116651 1993-08-04T14:03:27.260Z 34.377 -116.457 2.266 3.07 ci3116195 1993-08-02T21:04:25.550Z 34.115 -116.744 8.112 3.28 ci3115988 1993-07-29T16:08:09.140Z 33.252 -116.137 11.689 3.53 ci3115600 1993-07-20T17:23:54.670Z 33.921 -116.882 10.178 3.09 ci3114186 1993-07-08T22:57:44.870Z 34.245 -116.429 1.507 4.01 ci3112773 1993-07-07T22:07:37.130Z 34.251 -116.897 9.043 3.44 ci3112621 1993-06-28T23:43:32.250Z 34.145 -116.421 5.077 3.1 ci3111652 1993-06-26T12:48:02.460Z 34.076 -116.348 1.277 3.62 ci3111385 1993-06-22T23:08:10.940Z 34.626 -116.622 6.481 3.8 ci3110951 1993-06-19T07:20:26.400Z 34.078 -116.349 0.867 3.24 ci3110524 1993-06-12T04:23:29.000Z 33.41 -116.415 7.013 3.13 ci3109664 1993-06-08T21:20:15.020Z 34.124 -116.993 4.715 3.24 ci3109221 1993-06-05T11:55:55.700Z 34.148 -116.422 2.947 3.62 ci3108625 1993-05-31T08:55:29.990Z 34.12 -116.995 4.37 4.11 ci3107911 1993-05-25T00:17:57.770Z 34.121 -116.399 -0.843 3.2 ci3107022 1993-05-24T16:27:48.260Z 34.031 -116.327 5.675 3.19 ci3106978 1993-05-23T12:06:13.280Z 34.501 -116.512 3.608 3.26 ci3106767 1993-05-16T10:13:28.060Z 33.98 -116.37 4.641 3.06 ci3104937 1993-05-01T06:40:07.340Z 34.151 -116.423 5.307 3.32 ci3102951 1993-04-27T07:18:09.450Z 34.065 -117.275 15.053 3.27 ci3102466 1993-04-17T12:55:45.420Z 34.097 -116.439 8.367 3.01 ci3101253 1993-04-17T12:43:03.060Z 34.095 -116.44 9.797 3.73 ci3101250 Project No. 544-23112 37
11-934
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1993-04-16T14:35:22.510Z 34.004 -116.32 4.765 3.09 ci3101127 1993-04-12T11:18:32.850Z 34.143 -116.875 4.399 3.31 ci3100228 1993-04-12T08:32:27.460Z 34.143 -116.877 6.799 3.23 ci3100215 1993-04-11T19:47:43.540Z 34.143 -116.875 6.049 3.08 ci3100174 1993-04-08T20:19:33.760Z 34.023 -116.323 10.218 3.15 ci3099838 1993-03-22T15:41:42.710Z 33.49 -116.401 10.552 3.14 ci3097155 1993-03-22T13:08:16.910Z 34.468 -116.508 1.139 3.33 ci3097141 1993-03-20T06:56:55.360Z 34.012 -117.22 8.305 3.81 ci3096843 1993-03-16T07:50:13.540Z 34.224 -116.757 0.414 3.54 ci3096210 1993-03-08T09:09:02.110Z 33.997 -117.207 11.835 3.01 ci3095148 1993-02-21T08:57:12.440Z 34.168 -116.429 6.647 3.11 ci3093261 1993-02-19T17:36:27.400Z 34.306 -116.858 1.364 3.08 ci3093087 1993-02-15T07:59:33.170Z 34.405 -116.464 4.678 4.19 ci3092410 1993-02-10T17:00:38.250Z 34.389 -116.453 4.678 3.23 ci3091929 1993-02-09T20:24:47.090Z 34.499 -116.527 7.081 3.06 ci3091843 1993-02-01T06:01:39.730Z 34.237 -116.804 0.411 3.17 ci3089961 1993-01-31T11:56:32.260Z 33.754 -116.134 1.548 3.47 ci3089876 1993-01-26T01:27:13.980Z 33.965 -116.337 4.769 3.21 ci3089241 1993-01-18T14:59:41.510Z 33.2 -115.596 4.433 3.06 ci3088360 1993-01-18T11:55:33.690Z 34.61 -116.637 7.491 3.56 ci3088355 1993-01-18T09:30:33.540Z 34.613 -116.635 3.841 3.51 ci3088341 1993-01-13T07:02:37.430Z 34.106 -116.641 2.373 3.03 ci3087578 1993-01-13T02:05:02.660Z 34.047 -116.702 8.829 3.08 ci3087547 1993-01-11T05:51:29.180Z 34.391 -116.462 1.795 3 ci3087242 1993-01-04T00:32:23.040Z 34.288 -116.773 4.234 3.8 ci3086020 1993-01-03T11:46:41.130Z 34.61 -116.637 1.651 3 ci3085949 1992-12-31T07:49:10.600Z 34.267 -116.451 -0.29 3.22 ci3085547 1992-12-29T05:45:32.810Z 33.489 -116.486 9.416 4.01 ci3085286 1992-12-28T18:00:29.200Z 33.946 -116.306 3.819 3.72 ci3085227 1992-12-28T17:51:20.890Z 33.947 -116.307 3.669 3.33 ci3085226 1992-12-27T20:45:39.640Z 34.267 -116.458 -0.38 3.02 ci3085101 1992-12-27T00:18:38.000Z 34.352 -116.894 2.851 3.79 ci3084992 1992-12-25T22:15:27.160Z 33.96 -116.329 4.709 3.1 ci3084841 1992-12-21T13:39:27.000Z 34.233 -116.74 -0.489 3.38 ci3084163 1992-12-21T11:44:02.890Z 34.092 -116.415 2.667 3.89 ci3084155 1992-12-16T09:55:56.200Z 34.625 -116.546 2.15 3.24 ci3083389 1992-12-15T20:07:02.940Z 34.335 -116.887 1.131 3.24 ci3083299 1992-12-13T05:30:58.390Z 34.016 -116.345 0.431 3.21 ci3082942 1992-12-12T00:31:44.420Z 34.357 -116.896 2.941 3.51 ci3082801 1992-12-11T01:38:34.210Z 34.271 -116.404 1.81 4.12 ci3082658 1992-12-10T18:23:34.260Z 34.15 -116.415 2.937 3.51 ci3082607 1992-12-09T19:47:07.550Z 34.309 -116.433 6.27 3.33 ci3082466 1992-12-09T19:16:07.360Z 34.311 -116.427 5.776 3.01 ci3082461 Project No. 544-23112 38
11-935
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-12-09T09:28:35.010Z 34.244 -116.428 1.847 3.05 ci3082401 1992-12-09T03:39:34.500Z 34.354 -116.904 2.235 3.17 ci3082362 1992-12-08T20:06:35.380Z 34.515 -116.535 -1.382 3.08 ci3082298 1992-12-08T02:58:44.910Z 33.884 -116.286 6.401 3.48 ci3082179 1992-12-07T07:58:57.230Z 34.362 -116.917 -0.576 3.03 ci3082027 1992-12-07T03:33:31.470Z 34.362 -116.924 -0.571 4.03 ci3081990 1992-12-07T03:31:02.160Z 34.363 -116.929 -0.811 3.1 ci3081989 1992-12-07T00:49:23.580Z 34.378 -116.902 1.689 3.21 ci3081964 1992-12-06T02:40:50.800Z 34.148 -116.428 4.307 3.23 ci3081812 1992-12-05T05:20:35.590Z 34.363 -116.922 1.419 3.09 ci3081659 1992-12-04T12:59:42.110Z 34.361 -116.914 -0.981 4.24 ci3081531 1992-12-04T05:25:11.210Z 34.377 -116.918 1.011 4.66 ci3081464 1992-12-04T05:25:07.440Z 34.373 -116.912 1.985 4.61 ci3081485 1992-12-04T03:25:41.780Z 34.372 -116.908 -0.085 3.08 ci3081425 1992-12-04T02:19:11.610Z 34.371 -116.918 -0.171 3 ci3081411 1992-12-04T02:13:48.520Z 34.36 -116.922 -0.711 3.05 ci3081406 1992-12-04T02:13:46.050Z 34.361 -116.899 2.715 3.29 ci3081434 1992-12-04T02:08:57.500Z 34.369 -116.898 1.325 5.26 ci3081404 1992-12-02T05:42:06.220Z 34.356 -116.901 2.809 3.18 ci3081027 1992-11-30T15:29:38.730Z 34.364 -116.89 1.769 3.2 ci3080554 1992-11-30T03:06:06.370Z 34.015 -117.107 7.912 3.13 ci3080494 1992-11-29T23:53:27.740Z 34.353 -116.903 2.237 3.22 ci3080469 1992-11-29T21:02:53.990Z 34.146 -116.878 7.53 3.49 ci3080450 1992-11-29T14:21:20.510Z 34.371 -116.88 1.716 3.99 ci3080406 1992-11-29T00:15:04.950Z 34.364 -116.923 -1.673 3.45 ci3080328 1992-11-28T15:56:49.470Z 34.353 -116.88 0.993 3.04 ci3080254 1992-11-28T12:18:22.640Z 34.39 -116.458 4.196 3.05 ci3080219 1992-11-28T00:24:43.860Z 34.363 -116.916 0.008 3.23 ci3080157 1992-11-28T00:24:29.240Z 34.368 -116.882 1.698 3.18 ci3080124 1992-11-27T23:15:45.410Z 34.37 -116.882 1.548 3.4 ci3080102 1992-11-27T22:38:26.060Z 34.35 -116.887 -0.322 3.29 ci3080094 1992-11-27T20:15:20.490Z 34.345 -116.904 1.088 3.56 ci3080045 1992-11-27T19:34:37.910Z 34.346 -116.905 0.813 3.12 ci3080143 1992-11-27T18:39:18.520Z 34.367 -116.907 1.088 3.46 ci3080024 1992-11-27T18:37:49.190Z 34.361 -116.908 1.268 3.32 ci3080023 1992-11-27T18:33:01.700Z 34.37 -116.916 -1.707 3.38 ci3080118 1992-11-27T18:32:24.960Z 34.364 -116.905 -0.772 4.15 ci3080022 1992-11-27T18:30:39.030Z 34.34 -116.898 -0.242 3.2 ci3080021 1992-11-27T18:03:35.720Z 34.339 -116.896 -1.432 3 ci3079938 1992-11-27T17:38:45.620Z 34.365 -116.887 1.698 3.16 ci3080074 1992-11-27T16:27:50.440Z 34.338 -116.894 0.308 3.12 ci3079921 1992-11-27T16:23:48.050Z 34.356 -116.891 2.128 3.55 ci3079920 1992-11-27T16:17:30.080Z 34.345 -116.915 -1.446 3.19 ci3080044 Project No. 544-23112 39
11-936
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-11-27T16:17:15.570Z 34.339 -116.897 0.728 3.18 ci3079919 1992-11-27T16:11:53.760Z 34.364 -116.884 1.488 3.41 ci3079951 1992-11-27T16:11:11.550Z 34.363 -116.886 1.818 3.57 ci3079918 1992-11-27T16:00:57.490Z 34.34 -116.9 -0.402 5.29 ci3079915 1992-11-25T07:50:34.990Z 34.163 -116.422 0.157 3.8 ci3079557 1992-11-24T09:06:26.990Z 34.144 -116.881 7.76 3.84 ci3079392 1992-11-24T02:24:06.140Z 34.062 -116.367 2.397 3.07 ci3079361 1992-11-23T10:50:15.680Z 34.338 -116.904 0.718 3.33 ci3079249 1992-11-23T09:07:36.310Z 34.336 -116.904 -0.347 3.27 ci3079240 1992-11-23T06:07:59.350Z 34.406 -116.469 2.316 3 ci3079235 1992-11-18T14:10:11.600Z 34.008 -117.106 11.712 3.72 ci3078242 1992-11-18T06:13:01.920Z 34.509 -116.519 4.794 3.01 ci3078199 1992-11-11T08:41:28.100Z 34.038 -116.356 -0.789 3.07 ci3075775 1992-11-10T02:24:47.550Z 33.283 -116.272 0.447 3.34 ci3075564 1992-11-09T18:55:18.530Z 34.218 -116.447 2.227 3.27 ci3075482 1992-11-06T14:47:03.340Z 34.004 -116.747 17.621 3.86 ci3074958 1992-10-31T15:53:40.620Z 33.974 -116.927 3.165 3.04 ci3073837 1992-10-28T14:51:55.670Z 34.01 -116.32 4.205 3.05 ci3073285 1992-10-28T07:51:21.920Z 34.332 -116.459 7.246 3.51 ci3073242 1992-10-24T14:23:24.750Z 34.406 -116.511 -0.424 3.2 ci3072528 1992-10-23T14:15:53.410Z 34.569 -116.307 4.779 3.09 ci3072343 1992-10-22T17:51:20.840Z 33.964 -116.337 4.979 3.44 ci3072175 1992-10-22T16:21:08.600Z 34.304 -116.449 -0.33 3.33 ci3072162 1992-10-22T08:39:29.180Z 33.703 -117.464 9.586 3.81 ci3072095 1992-10-22T04:23:53.160Z 33.943 -116.31 4.299 3.32 ci3072062 1992-10-20T00:25:44.400Z 34.256 -116.435 3.887 3.33 ci3071654 1992-10-18T03:07:18.710Z 34.356 -116.452 -1.374 3.3 ci3071282 1992-10-16T19:58:16.990Z 34.606 -116.33 -1.154 3.4 ci3071007 1992-10-13T15:57:03.040Z 34.625 -116.669 6.148 3.42 ci3070374 1992-10-13T08:07:17.980Z 34.577 -116.321 4.779 3.11 ci3070319 1992-10-07T17:26:17.330Z 33.189 -115.603 3.157 3.04 ci3069332 1992-10-06T21:32:04.120Z 34.198 -116.436 0.167 3.75 ci3069069 1992-10-05T23:16:03.100Z 34.371 -116.43 1.476 3.27 ci3068824 1992-10-05T10:06:26.660Z 34.415 -116.482 -0.124 3.66 ci3068696 1992-10-02T21:42:18.040Z 34.035 -117.187 5.411 3.17 ci2060135 1992-10-02T15:49:56.170Z 33.973 -116.385 7.658 3.04 ci3068133 1992-10-02T12:12:14.120Z 34.604 -116.628 2.156 3.24 ci3068081 1992-10-02T07:19:57.340Z 34.601 -116.636 2.014 4.59 ci3068003 1992-09-29T22:16:46.320Z 34.059 -116.374 0.107 3.82 ci3067508 1992-09-28T12:07:26.220Z 34.127 -116.398 -0.003 3.55 ci3067202 1992-09-27T17:44:23.360Z 34.165 -116.413 -0.603 3.01 ci3067049 1992-09-24T21:44:26.800Z 34.338 -116.674 -1.516 3.22 ci3066432 1992-09-22T13:21:51.420Z 34.139 -116.598 -0.161 3 ci3065839 Project No. 544-23112 40
11-937
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-09-22T01:43:10.320Z 34.554 -116.529 2.917 3 ci3065738 1992-09-20T14:19:33.370Z 33.91 -116.769 17.433 3.47 ci3065257 1992-09-18T16:59:51.790Z 34.556 -116.551 2.264 3.82 ci3064606 1992-09-18T12:54:33.850Z 34.057 -116.376 5.407 3.73 ci3064608 1992-09-18T12:53:35.510Z 34.052 -116.384 0.373 3.83 ci3064607 1992-09-18T12:51:54.320Z 34.051 -116.384 0.383 3.91 ci3064484 1992-09-18T10:52:58.930Z 34.053 -116.387 0.233 3.35 ci3064456 1992-09-17T11:22:32.920Z 34.413 -116.46 8.196 3.76 ci3064031 1992-09-16T14:31:03.870Z 34.273 -116.476 5.55 3.18 ci3063266 1992-09-16T12:27:22.020Z 34.054 -116.387 -0.097 3.72 ci3063225 1992-09-15T09:44:50.400Z 34.055 -116.387 -0.167 3.02 ci3062589 1992-09-15T09:34:03.470Z 34.07 -116.361 -0.963 3 ci3062582 1992-09-15T08:47:11.300Z 34.064 -116.361 7.177 5.26 ci3062563 1992-09-13T23:16:59.050Z 33.977 -116.272 4.495 3.17 ci3062115 1992-09-13T13:33:49.910Z 33.893 -116.285 7.641 3.18 ci3062012 1992-09-09T23:04:55.840Z 34.298 -116.456 4.25 3.01 ci3061077 1992-09-09T14:01:28.430Z 33.946 -116.334 5.109 3.26 ci3060943 1992-09-09T12:52:56.220Z 33.951 -116.333 4.419 3.56 ci3060966 1992-09-09T12:50:45.140Z 33.947 -116.33 4.549 4.32 ci3060932 1992-09-09T04:17:11.220Z 33.994 -116.346 0.381 3.06 ci3060882 1992-09-08T18:28:17.490Z 34.515 -116.536 -0.679 3.08 ci3060666 1992-09-08T03:44:49.860Z 34.109 -116.982 2.473 3.43 ci3060527 1992-09-07T23:50:59.680Z 34.233 -116.84 0.991 3.32 ci3060492 1992-09-06T22:16:53.680Z 34.026 -117.195 5.361 3.18 ci3060243 1992-09-06T17:51:06.690Z 34.023 -117.192 5.231 3.56 ci3060198 1992-09-06T02:56:11.460Z 34.454 -116.532 3.004 3.44 ci3060041 1992-09-05T23:43:14.400Z 34.257 -116.437 1.957 3.3 ci3060005 1992-09-05T03:29:27.120Z 34.095 -116.415 2.537 3.93 ci3059832 1992-09-03T06:17:38.450Z 34.372 -116.442 2.106 3.8 ci3059381 1992-09-02T09:28:21.440Z 34.117 -116.99 2.805 3.08 ci3058939 1992-09-02T00:48:41.760Z 34.327 -116.46 1.566 3.16 ci3058844 1992-09-01T21:17:57.890Z 34.267 -116.769 1.023 3.16 ci3058874 1992-09-01T12:17:24.810Z 34.597 -116.324 -1.144 3.9 ci3059325 1992-08-31T09:25:40.630Z 34.455 -116.47 9.616 4.36 ci3058571 1992-08-30T11:06:35.700Z 34.326 -116.683 -1.506 3.03 ci3058362 1992-08-28T19:05:05.220Z 34.627 -116.555 2.35 3.03 ci3057974 1992-08-28T13:26:11.840Z 34.429 -116.523 2.394 3.03 ci3057928 1992-08-28T06:24:20.980Z 34.604 -116.635 2.32 3.17 ci3057856 1992-08-28T03:20:05.210Z 34.274 -116.773 -0.437 3.03 ci3057821 1992-08-26T13:50:49.650Z 34.106 -116.985 2.503 3.4 ci3057380 1992-08-26T13:21:57.470Z 34.06 -116.368 -1.093 3.83 ci3057371 1992-08-24T18:21:42.480Z 34.277 -116.777 -0.309 3.45 ci3056869 1992-08-24T16:45:33.200Z 34.184 -116.808 7.687 3.32 ci3056839 Project No. 544-23112 41
11-938
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-08-24T13:51:46.040Z 34.274 -116.774 -0.187 4.29 ci3056815 1992-08-24T05:47:44.110Z 34.267 -116.408 0.09 3.06 ci3056936 1992-08-23T18:50:59.220Z 34.161 -116.819 5.37 3.17 ci3056626 1992-08-23T17:49:31.560Z 34.123 -116.735 8.802 3.37 ci3056618 1992-08-23T13:46:24.640Z 34.111 -116.989 1.983 3.04 ci3056859 1992-08-23T07:36:06.180Z 34.142 -116.838 4.399 3.08 ci3056516 1992-08-23T05:30:23.100Z 34.218 -116.776 -0.077 3.39 ci3056494 1992-08-23T02:55:11.590Z 34.215 -116.737 0.313 3.24 ci3056472 1992-08-22T01:52:59.820Z 34.109 -116.985 2.243 3.33 ci3056221 1992-08-22T00:17:08.800Z 34.188 -116.787 -0.627 3.06 ci3056210 1992-08-21T19:46:06.580Z 34.042 -116.909 15.975 3.02 ci3056164 1992-08-19T07:50:12.260Z 34.414 -116.509 2.356 3.21 ci3055470 1992-08-19T03:10:07.360Z 34.497 -116.519 -0.302 3.07 ci3055426 1992-08-18T09:46:40.730Z 34.197 -116.862 10.33 4.14 ci3055197 1992-08-17T22:04:28.060Z 34.052 -116.385 0.383 3.21 ci3055149 1992-08-17T21:25:47.600Z 34.195 -116.869 9.03 3.35 ci3055037 1992-08-17T21:01:33.510Z 34.194 -116.877 10.19 3.61 ci3055035 1992-08-17T20:55:27.690Z 34.2 -116.875 10.04 3.09 ci3055033 1992-08-17T20:41:52.120Z 34.195 -116.863 9.44 5.23 ci3055028 1992-08-17T18:39:54.960Z 34.122 -116.395 0.417 3.29 ci3055006 1992-08-17T12:49:42.020Z 34.089 -116.431 0.247 3.03 ci3054931 1992-08-16T06:30:59.510Z 34.03 -116.678 8.692 3.72 ci3054583 1992-08-16T06:15:51.000Z 34.42 -116.478 1.574 3.19 ci3054581 1992-08-15T19:09:06.210Z 34.114 -116.991 3.023 3.47 ci3054427 1992-08-15T18:18:06.180Z 34.116 -116.989 2.513 3.65 ci3054415 1992-08-15T16:47:30.650Z 34.609 -116.639 4.94 3.15 ci3054396 1992-08-15T09:27:13.230Z 34.091 -116.402 -0.873 3.29 ci3054302 1992-08-15T08:54:34.380Z 34.42 -116.479 7.456 3.35 ci3054300 1992-08-15T08:24:14.660Z 34.087 -116.403 -0.546 4.73 ci3054293 1992-08-15T07:37:31.370Z 34.358 -116.456 -0.744 3.06 ci3054283 1992-08-15T02:57:22.370Z 34.445 -116.493 -0.089 3.17 ci3054212 1992-08-15T00:19:22.570Z 33.93 -116.306 3.881 3.54 ci3054179 1992-08-14T23:25:01.910Z 34.417 -116.504 0.043 3.15 ci3054168 1992-08-14T14:43:44.500Z 34.09 -116.369 -0.01 3.91 ci3054010 1992-08-14T10:50:10.390Z 34.104 -116.443 7.853 3.24 ci3054091 1992-08-14T01:31:06.530Z 34.232 -116.853 9.053 3.04 ci3053850 1992-08-13T19:53:41.230Z 34.619 -116.662 3.091 3.19 ci3053775 1992-08-13T09:45:23.800Z 34.643 -116.519 4.417 3.16 ci3053660 1992-08-13T08:14:22.370Z 34.623 -116.666 4.291 3.26 ci3053652 1992-08-13T07:25:26.480Z 34.115 -116.987 2.833 3.13 ci3053641 1992-08-12T15:12:01.650Z 34.112 -116.992 2.855 3.42 ci3053417 1992-08-12T03:26:36.480Z 33.069 -116.612 5.132 3.42 ci3053268 1992-08-12T03:26:21.710Z 33.066 -116.615 14.266 3.23 ci3053239 Project No. 544-23112 42
11-939
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-08-11T23:27:29.500Z 34.248 -116.433 2.507 3.59 ci3053192 1992-08-11T23:08:25.000Z 34.247 -116.434 2.077 3.51 ci3053187 1992-08-11T11:28:39.550Z 34.625 -116.609 3.665 3.38 ci3053037 1992-08-11T06:11:17.250Z 34.06 -116.374 -0.374 4.3 ci3052987 1992-08-08T15:37:43.340Z 34.376 -116.459 1.384 4.57 ci3052180 1992-08-07T19:04:08.530Z 34.219 -116.744 0.737 3.42 ci3051871 1992-08-07T02:11:33.010Z 34.112 -116.394 -1.014 3.13 ci3051641 1992-08-07T02:04:24.710Z 34.115 -116.391 -0.049 3.07 ci3051639 1992-08-07T00:43:28.390Z 34.269 -116.774 0.107 3.93 ci3051614 1992-08-06T17:23:07.820Z 34.602 -116.574 8.055 3.51 ci3051512 1992-08-06T14:49:18.790Z 34.628 -116.629 7.085 3.11 ci3051283 1992-08-06T13:14:43.100Z 34.344 -116.454 2.88 3 ci3051256 1992-08-05T20:03:56.520Z 34.271 -116.869 3.467 3.15 ci3051038 1992-08-05T17:26:10.950Z 34.098 -116.45 7.398 3.56 ci3051004 1992-08-05T17:00:18.800Z 34.515 -116.518 3.904 3.17 ci3051001 1992-08-05T15:41:54.370Z 34.646 -116.53 3.107 4.09 ci3051552 1992-08-05T15:05:07.530Z 34.039 -116.358 0.233 3.21 ci3051130 1992-08-05T13:01:53.610Z 33.195 -115.602 4.4 3.05 ci3050943 1992-08-05T12:49:06.400Z 34.04 -116.362 0.286 3.24 ci3050942 1992-08-04T21:53:23.060Z 34.085 -116.381 -0.896 3.07 ci3050700 1992-08-04T19:06:12.290Z 34.102 -116.384 -0.925 4 ci3050647 1992-08-04T05:50:27.460Z 33.951 -116.853 6.55 3.05 ci3050459 1992-08-01T14:40:53.060Z 34.366 -116.457 -0.274 3.29 ci3049586 1992-08-01T08:38:16.460Z 33.947 -116.311 3.719 3.01 ci3049510 1992-08-01T04:57:06.930Z 34.12 -116.394 0.407 3.3 ci3049458 1992-07-31T22:37:16.950Z 34.325 -116.456 5.74 3.55 ci3049370 1992-07-31T18:21:18.760Z 34.104 -116.42 -0.783 3.1 ci3049303 1992-07-31T18:03:52.400Z 34.099 -116.42 -0.883 3.97 ci3049302 1992-07-31T16:31:01.840Z 34.337 -116.899 -0.108 3.52 ci3049275 1992-07-31T11:29:54.160Z 34.444 -116.457 2.102 3.48 ci3049214 1992-07-31T10:51:25.900Z 34.129 -116.876 4.413 3.25 ci3049208 1992-07-31T06:20:19.350Z 34.04 -116.354 -0.381 3.01 ci3049155 1992-07-30T21:08:20.910Z 33.941 -116.357 6.459 3.43 ci3049019 1992-07-30T20:59:51.800Z 33.918 -116.297 2.209 3.02 ci3049016 1992-07-30T07:40:15.360Z 34.393 -116.458 2.126 3.1 ci3048833 1992-07-29T16:48:59.200Z 34.353 -116.468 5.116 3.05 ci3048571 1992-07-29T13:34:43.730Z 34.203 -116.863 0.75 3.27 ci3048929 1992-07-29T13:33:22.600Z 34.326 -116.452 0.184 3.48 ci3048508 1992-07-29T07:43:59.760Z 34.628 -116.664 1.888 3.11 ci3048415 1992-07-29T01:04:08.720Z 34.117 -116.419 -0.903 3.1 ci3048307 1992-07-29T00:32:40.910Z 34.048 -116.403 3.403 3.14 ci3048298 1992-07-28T18:27:03.900Z 34.112 -116.415 -0.893 4.6 ci3048163 1992-07-28T17:41:08.970Z 34.447 -116.484 0.056 3.01 ci3048156 Project No. 544-23112 43
11-940
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-28T05:40:10.340Z 34.351 -116.448 -1.166 3.15 ci3047956 1992-07-27T22:17:14.880Z 34.294 -116.864 3.865 3.26 ci3047843 1992-07-27T11:12:13.850Z 34.24 -116.836 1.553 3.07 ci3047641 1992-07-26T19:26:02.680Z 34.314 -116.451 4.136 3.27 ci3047800 1992-07-26T11:19:58.200Z 33.9 -116.282 5.551 3.05 ci3047296 1992-07-25T17:02:20.240Z 33.941 -116.304 4.171 3.86 ci3047019 1992-07-25T12:41:42.550Z 33.901 -116.289 5.181 3.07 ci3046937 1992-07-25T10:27:10.390Z 34.267 -116.917 3.494 3.85 ci3046907 1992-07-25T08:21:40.390Z 34.111 -116.919 4.373 3.45 ci3047103 1992-07-25T06:35:54.590Z 34.194 -116.431 -1.123 3.18 ci3046851 1992-07-25T04:31:59.930Z 33.937 -116.306 3.701 4.83 ci3046818 1992-07-25T04:11:47.350Z 34.08 -116.377 -0.886 3.21 ci3046816 1992-07-25T00:35:29.190Z 34.272 -116.726 -0.194 3.14 ci3046765 1992-07-24T22:31:49.340Z 34.28 -116.777 0.855 3.22 ci3046731 1992-07-24T18:21:24.230Z 33.902 -116.286 7.814 3.34 ci3046662 1992-07-24T18:16:53.280Z 33.904 -116.289 6.371 3.38 ci3047952 1992-07-24T18:14:36.250Z 33.901 -116.285 7.214 4.96 ci3046661 1992-07-24T12:26:10.180Z 34.193 -116.868 2.497 3.11 ci3046563 1992-07-24T07:23:56.070Z 34.488 -116.484 7.182 3.98 ci3046496 1992-07-24T06:37:37.740Z 34.324 -116.637 1.888 3.03 ci3046488 1992-07-23T23:05:07.950Z 34.085 -116.855 1.252 3.41 ci3046349 1992-07-23T22:42:06.170Z 34.084 -116.854 1.122 3.18 ci3046344 1992-07-23T12:51:06.510Z 34.063 -116.41 -0.907 3.01 ci3046169 1992-07-23T07:37:25.640Z 34.174 -116.806 3.663 3.51 ci3046103 1992-07-23T02:08:12.050Z 34.136 -116.865 10.02 3.14 ci3046010 1992-07-22T18:56:37.580Z 34.306 -116.996 5.447 3.13 ci3045879 1992-07-22T10:41:58.000Z 34.111 -116.918 4.015 3.1 ci3045738 1992-07-22T07:10:04.300Z 34.313 -116.48 0.807 3.02 ci3045683 1992-07-22T05:28:55.320Z 34.573 -116.546 3.782 3.08 ci3045652 1992-07-22T04:13:56.490Z 34.349 -116.482 -1.048 3.08 ci3045630 1992-07-21T23:22:10.150Z 34.133 -116.603 0.565 4.11 ci3045548 1992-07-21T21:12:45.040Z 34.217 -116.772 0.05 3.25 ci3045554 1992-07-21T21:10:29.020Z 34.219 -116.771 -0.1 4 ci3045519 1992-07-21T18:00:50.780Z 33.941 -116.346 3.398 3.41 ci3045453 1992-07-21T13:30:01.730Z 34.15 -116.848 10.194 3.54 ci3045384 1992-07-20T23:04:11.680Z 34.511 -116.53 5.045 3.27 ci3045146 1992-07-20T08:45:49.000Z 34.055 -116.38 2.08 3.25 ci3044960 1992-07-20T07:10:13.650Z 34.282 -116.444 5.045 3.58 ci3044944 1992-07-20T06:16:34.090Z 34.113 -116.724 9.858 3.44 ci3044929 1992-07-20T04:08:23.020Z 34.195 -116.431 5.051 4.14 ci3044893 1992-07-19T16:22:50.050Z 34.54 -116.542 2.837 3 ci3044748 1992-07-18T22:14:04.970Z 34.278 -116.731 -0.665 3.02 ci3044484 1992-07-18T20:09:05.230Z 34.317 -116.413 5.067 3.11 ci3044455 Project No. 544-23112 44
11-941
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-18T12:00:52.450Z 34.408 -116.425 -0.598 3.27 ci3044333 1992-07-18T01:01:15.060Z 34.099 -116.401 2.671 3.51 ci3044172 1992-07-18T00:36:16.960Z 34.067 -116.385 2.105 3.4 ci3044169 1992-07-18T00:06:11.240Z 34.096 -116.418 1.661 3.95 ci3044164 1992-07-17T21:38:31.470Z 34.544 -116.544 3.86 3.15 ci3044119 1992-07-17T17:46:41.960Z 34.031 -116.431 7.763 3.21 ci3044058 1992-07-17T17:04:51.960Z 34.476 -116.506 2.526 3.03 ci3044040 1992-07-16T17:19:17.380Z 34.443 -116.454 1.651 3.77 ci3043567 1992-07-16T16:36:25.960Z 34.442 -116.535 2.532 3.47 ci3043767 1992-07-16T16:36:22.220Z 34.442 -116.526 4.111 3.86 ci3043540 1992-07-16T11:38:48.390Z 34.141 -116.721 4.58 3.27 ci3043457 1992-07-16T11:38:11.660Z 33.882 -116.247 4.025 3.48 ci3045626 1992-07-16T05:45:38.560Z 34.073 -116.385 7.567 3.15 ci3119065 1992-07-16T02:16:24.010Z 34.625 -116.633 1.555 3.05 ci3044095 1992-07-16T01:39:27.780Z 33.937 -116.31 0.719 3.56 ci3043301 1992-07-16T01:38:58.450Z 34.14 -116.868 2.058 3.94 ci3043346 1992-07-16T01:37:51.160Z 34.418 -116.468 1.542 3.57 ci3043345 1992-07-15T12:45:20.950Z 34.117 -116.376 0.702 3.7 ci3042953 1992-07-15T04:05:20.290Z 34.275 -116.694 3.032 3.1 ci3042834 1992-07-15T00:18:56.890Z 34.332 -116.462 -0.847 3.96 ci3042764 1992-07-14T22:33:13.060Z 33.937 -116.398 -1.04 3.08 ci3042732 1992-07-14T20:46:43.030Z 34.246 -116.441 4.909 3.23 ci3042690 1992-07-14T20:36:51.520Z 34.644 -116.644 5.782 3.82 ci3042689 1992-07-14T17:24:37.350Z 34.243 -116.458 5.054 3.3 ci3042621 1992-07-14T16:21:51.150Z 34.114 -116.409 5.119 3.41 ci3224812 1992-07-14T15:09:15.690Z 34.219 -116.771 0.127 3.76 ci3042589 1992-07-14T13:04:02.640Z 34.187 -116.801 -0.36 3.44 ci3042555 1992-07-14T12:41:55.030Z 34.601 -116.627 2.462 3.33 ci3042553 1992-07-14T06:38:35.120Z 34.063 -116.416 0.05 3.14 ci3111974 1992-07-14T03:43:53.610Z 34.192 -116.436 -0.919 3.29 ci3042403 1992-07-13T19:30:30.340Z 34.58 -116.322 4.914 3.03 ci3110977 1992-07-13T18:14:59.550Z 33.166 -116.534 10.151 3 ci3042214 1992-07-13T11:33:47.280Z 34.208 -116.86 0.058 3.26 ci3102057 1992-07-13T05:00:00.800Z 34.087 -116.41 2.289 3.79 ci3041981 1992-07-13T00:11:51.080Z 34.326 -116.673 -1.17 3.89 ci3041900 1992-07-12T23:18:20.810Z 34.032 -116.363 0.693 3.15 ci3042122 1992-07-12T23:09:29.400Z 34.073 -116.413 -0.997 3.06 ci3041880 1992-07-12T22:36:50.850Z 34.264 -116.455 4.343 3.58 ci3041872 1992-07-12T16:36:14.060Z 34.245 -116.439 2.605 3.38 ci3041761 1992-07-12T13:40:04.510Z 34.399 -116.474 -0.417 3.05 ci3041712 1992-07-12T11:53:18.580Z 34.423 -116.533 2.084 3.1 ci3132558 1992-07-12T11:13:27.340Z 34.551 -116.535 8.621 3.04 ci3041669 1992-07-12T07:00:18.410Z 34.132 -117.006 2.728 3.24 ci3041614 Project No. 544-23112 45
11-942
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-12T05:35:13.440Z 34.551 -116.537 7.451 3.91 ci3041594 1992-07-12T04:59:14.450Z 34.634 -116.618 4.696 3.05 ci3041582 1992-07-12T02:17:59.800Z 34.096 -116.405 2.222 3.29 ci3109034 1992-07-12T00:08:58.660Z 34.109 -116.914 6.836 3.18 ci3110115 1992-07-11T21:32:26.230Z 34.197 -116.79 1.016 3.28 ci3109594 1992-07-11T19:45:22.500Z 34.19 -116.801 -0.16 3.06 ci3041415 1992-07-11T18:07:07.310Z 34.472 -116.524 -1.094 3.43 ci3041387 1992-07-11T07:21:36.290Z 34.445 -116.499 0.754 3.8 ci3109027 1992-07-11T04:14:13.420Z 34.173 -116.432 3.682 3.07 ci3041147 1992-07-11T00:14:07.100Z 34.333 -116.642 -1.252 3.02 ci3041064 1992-07-10T23:55:51.610Z 34.626 -116.547 1.667 3.29 ci3041060 1992-07-10T19:06:27.990Z 34.65 -116.459 -0.384 3.2 ci3041441 1992-07-10T16:43:37.470Z 34.585 -116.59 5.862 3.03 ci3108936 1992-07-10T16:30:56.290Z 34.496 -116.521 1.526 3.21 ci3108931 1992-07-10T16:01:37.480Z 34.469 -116.507 0.736 3.44 ci3040693 1992-07-10T14:51:32.200Z 34.204 -116.807 1.186 3.2 ci3040663 1992-07-10T14:23:18.840Z 34.469 -116.502 -0.514 3.05 ci3040658 1992-07-10T12:55:59.850Z 34.066 -116.366 1.242 3.14 ci3108421 1992-07-10T09:45:46.840Z 34.443 -116.499 0.735 3.09 ci3040563 1992-07-10T07:52:12.340Z 34.313 -116.458 4.262 3.3 ci3040526 1992-07-10T05:48:43.240Z 34.108 -116.401 2.476 3.34 ci3040486 1992-07-10T04:57:07.660Z 34.077 -116.378 -0.468 3.38 ci3108721 1992-07-10T03:40:15.350Z 34.326 -116.652 -0.04 3.04 ci3040449 1992-07-10T02:41:14.380Z 34.12 -116.394 2.266 4 ci3108718 1992-07-10T02:30:23.580Z 34.228 -116.817 -1.564 3.52 ci3108550 1992-07-10T01:56:37.800Z 34.229 -116.82 -1.854 3.23 ci3040417 1992-07-10T01:29:40.000Z 34.232 -116.846 -1.514 4.22 ci3040406 1992-07-10T01:14:54.160Z 34.101 -116.435 2.156 3.18 ci3040401 1992-07-09T21:43:53.880Z 34.275 -116.726 0.001 3.06 ci3108313 1992-07-09T21:14:03.390Z 34.116 -116.393 -0.339 3.01 ci3106250 1992-07-09T17:08:59.650Z 34.152 -116.544 7.474 3.34 ci3040203 1992-07-09T12:23:17.830Z 34.217 -116.809 -0.531 4.18 ci3040107 1992-07-09T12:15:56.600Z 34.225 -116.74 -0.557 3.41 ci3040105 1992-07-09T09:49:16.230Z 34.595 -116.627 2.082 3.4 ci3040040 1992-07-09T08:14:54.430Z 34.025 -116.35 0.266 3.21 ci3040330 1992-07-09T07:41:45.980Z 34.286 -116.682 7.208 3.02 ci3039994 1992-07-09T06:05:36.760Z 34.233 -116.827 -1.635 3 ci3040184 1992-07-09T06:03:28.970Z 34.233 -116.83 -1.404 3.86 ci3039963 1992-07-09T05:37:37.530Z 34.181 -116.868 7.573 3.32 ci3209289 1992-07-09T05:05:15.620Z 34.232 -116.846 -0.375 3.09 ci3209183 1992-07-09T04:03:13.990Z 34.231 -116.823 -1.534 3.67 ci3118276 1992-07-09T03:14:18.170Z 34.425 -116.482 0.952 3.12 ci3039906 1992-07-09T02:56:54.290Z 34.227 -116.851 -1.666 3.87 ci3040313 Project No. 544-23112 46
11-943
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-09T02:43:38.740Z 34.23 -116.831 -1.524 3.38 ci3039895 1992-07-09T02:41:53.020Z 34.224 -116.845 -0.604 3.25 ci3039894 1992-07-09T02:37:24.440Z 34.228 -116.845 -1.924 3.7 ci3040288 1992-07-09T02:34:35.040Z 34.225 -116.844 -1.407 4.17 ci3039891 1992-07-09T02:27:43.250Z 34.645 -116.654 3.694 3.18 ci3137237 1992-07-09T02:23:47.140Z 34.215 -116.822 -0.444 3.03 ci3110828 1992-07-09T01:43:57.610Z 34.239 -116.837 -1.934 4.87 ci3039881 1992-07-08T23:58:22.600Z 34.234 -116.837 -1.924 3.29 ci3039838 1992-07-08T19:47:18.530Z 34.074 -116.377 1.59 3.24 ci3104892 1992-07-08T18:19:12.790Z 34.293 -116.481 4.907 3.21 ci3039300 1992-07-08T17:59:51.950Z 34.259 -116.454 1.917 3.21 ci3039208 1992-07-08T15:34:08.560Z 34.347 -116.465 4.838 3.6 ci3038445 1992-07-08T08:05:38.730Z 34.604 -116.351 9.29 4.32 ci3038252 1992-07-08T07:58:28.200Z 34.149 -116.427 4.1 3.04 ci3038251 1992-07-08T02:23:11.330Z 34.575 -116.336 4.9 4.91 ci3038139 1992-07-07T22:21:45.470Z 34.274 -116.726 -1.209 3.08 ci3037286 1992-07-07T22:09:28.330Z 34.342 -116.468 1.386 4.42 ci3037284 1992-07-07T21:01:10.840Z 33.953 -116.358 6.547 3.7 ci3037254 1992-07-07T19:53:02.800Z 34.598 -116.317 5.045 3.05 ci3037226 1992-07-07T17:55:54.730Z 34.311 -116.47 -0.961 3.01 ci3037180 1992-07-07T17:13:57.630Z 34.237 -116.394 -0.944 3.25 ci3037167 1992-07-07T16:47:35.930Z 34.431 -116.48 -0.334 3.18 ci3037159 1992-07-07T16:17:54.760Z 34.247 -116.716 -0.347 3.1 ci3037150 1992-07-07T15:39:58.620Z 34.161 -116.426 -0.738 3.45 ci3037136 1992-07-07T13:53:28.570Z 34.398 -116.464 -0.684 3.5 ci3037091 1992-07-07T13:38:03.730Z 34.23 -116.833 -1.934 3.59 ci3037082 1992-07-07T12:11:26.080Z 34.059 -116.408 2.252 3.18 ci3037046 1992-07-07T11:42:41.890Z 34.581 -116.533 4.54 3.15 ci2081122 1992-07-07T09:29:47.760Z 34.207 -116.771 -0.041 3.58 ci3036991 1992-07-07T08:38:03.210Z 34.211 -116.766 0.029 3.48 ci3036972 1992-07-07T08:21:03.140Z 34.069 -116.382 2.182 4.14 ci3036970 1992-07-07T07:18:52.660Z 34.589 -116.293 4.962 3.01 ci3089206 1992-07-07T05:59:59.760Z 34.588 -116.598 5.868 3.45 ci3036923 1992-07-07T05:33:41.480Z 34.635 -116.509 2.568 3.49 ci3036915 1992-07-07T04:48:52.600Z 34.246 -116.715 0.013 3.89 ci3036901 1992-07-07T01:45:38.380Z 34.232 -116.895 3.586 3.38 ci3036828 1992-07-07T01:12:49.950Z 34.63 -116.629 6.012 3.03 ci3036814 1992-07-06T19:48:13.950Z 34.456 -116.484 1.805 3 ci3036689 1992-07-06T19:42:43.640Z 34.08 -116.384 1.797 3.19 ci3037043 1992-07-06T19:41:37.890Z 34.082 -116.379 2.183 4.44 ci3036688 1992-07-06T18:27:27.730Z 34.152 -116.407 0.155 3.66 ci3036662 1992-07-06T18:06:36.310Z 34.457 -116.477 -0.475 4.26 ci3036655 1992-07-06T17:22:01.500Z 34.263 -116.44 0.057 3.27 ci3036642 Project No. 544-23112 47
11-944
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-06T17:10:23.350Z 34.6 -116.636 2.504 3.08 ci3036743 1992-07-06T13:15:09.620Z 34.236 -116.856 2.379 3 ci3035726 1992-07-06T12:48:25.610Z 34.312 -116.459 3.357 3.51 ci3035715 1992-07-06T12:26:12.340Z 34.047 -116.366 0.683 3.3 ci3035710 1992-07-06T12:00:59.190Z 34.092 -116.37 0.683 4.43 ci3035697 1992-07-06T11:46:34.650Z 34.221 -116.746 0.651 3.36 ci3035694 1992-07-06T11:42:53.470Z 34.128 -116.917 3.635 3.24 ci3035692 1992-07-06T11:38:03.440Z 34.094 -116.448 7.934 3.34 ci3035723 1992-07-06T11:35:33.360Z 34.093 -116.447 8.894 3.94 ci3035691 1992-07-06T11:03:13.900Z 34.165 -116.829 8.745 3.21 ci3035679 1992-07-06T06:00:44.440Z 34.101 -116.384 1.777 3.25 ci3035564 1992-07-06T04:49:30.620Z 34.582 -116.306 4.854 3.49 ci3036979 1992-07-06T04:48:34.490Z 34.053 -116.429 8.993 3.58 ci3035540 1992-07-06T03:18:41.720Z 34.614 -116.337 -1.087 3.05 ci3035812 1992-07-06T02:13:59.340Z 34.565 -116.286 4.918 3.45 ci3035477 1992-07-06T02:10:02.380Z 34.572 -116.298 4.918 3.3 ci3035475 1992-07-06T01:11:37.660Z 34.223 -116.863 0.839 3.59 ci3035441 1992-07-06T00:15:30.060Z 34.101 -116.399 3.753 3.13 ci3035416 1992-07-05T23:11:10.280Z 34.585 -116.29 4.903 3.48 ci3035388 1992-07-05T22:45:14.480Z 34.583 -116.302 4.918 3.34 ci3035376 1992-07-05T22:33:46.040Z 34.585 -116.301 5.08 4.43 ci3035375 1992-07-05T22:08:31.950Z 34.587 -116.295 4.903 3.8 ci3035369 1992-07-05T21:18:27.600Z 34.583 -116.322 4.922 5.42 ci3035348 1992-07-05T21:05:36.340Z 34.631 -116.68 -0.918 3.38 ci3096977 1992-07-05T20:26:31.410Z 34.339 -116.641 -1.514 3.03 ci3035333 1992-07-05T20:03:03.100Z 34.298 -116.805 1.125 4.06 ci3035325 1992-07-05T19:15:20.020Z 34.094 -116.849 0.25 3.55 ci3035308 1992-07-05T19:01:36.410Z 34.097 -116.855 0.17 3.2 ci3035513 1992-07-05T19:00:39.500Z 34.093 -116.85 0.32 3.43 ci3035514 1992-07-05T18:48:27.280Z 34.272 -116.406 1.399 3.68 ci3035298 1992-07-05T18:23:39.390Z 34.273 -116.408 -0.091 3.45 ci3095731 1992-07-05T18:23:15.670Z 34.531 -116.541 -1.356 3.28 ci3035294 1992-07-05T17:57:28.020Z 34.513 -116.513 6.536 3.15 ci3035285 1992-07-05T13:52:59.410Z 34.121 -116.391 0.144 3.86 ci3035178 1992-07-05T12:01:54.340Z 34.245 -116.791 5.261 3.34 ci3035139 1992-07-05T11:28:22.990Z 34.171 -116.821 7.56 3.08 ci3035125 1992-07-05T11:14:38.040Z 34.068 -116.365 1.483 3.82 ci3035120 1992-07-05T10:36:19.090Z 34.62 -116.343 6.614 3.55 ci3035109 1992-07-05T10:23:11.620Z 34.124 -117.001 3.309 3.07 ci3035107 1992-07-05T08:06:29.850Z 34.128 -116.731 9.223 3.15 ci3035053 1992-07-05T06:53:03.940Z 34.39 -116.457 0.583 3.75 ci3035014 1992-07-05T05:49:38.160Z 33.945 -116.399 2.14 4.07 ci3034959 1992-07-05T04:31:18.340Z 34.644 -116.659 3.472 3.63 ci3034930 Project No. 544-23112 48
11-945
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-05T04:18:45.500Z 33.677 -116.705 16.781 3.09 ci3094727 1992-07-05T03:16:27.420Z 34.071 -116.371 1.213 3.48 ci3034910 1992-07-05T02:09:27.870Z 34.191 -116.803 -0.89 3.32 ci3034890 1992-07-05T01:58:18.850Z 34.314 -116.455 6.997 3.32 ci3034889 1992-07-04T23:11:50.190Z 34.093 -116.425 -0.511 3.01 ci3034822 1992-07-04T21:08:47.270Z 34.192 -116.433 -1.057 3.25 ci3035209 1992-07-04T21:06:51.490Z 34.199 -116.435 -1.057 3.6 ci3034783 1992-07-04T17:55:01.030Z 34.602 -116.638 -1.158 3.09 ci3035283 1992-07-04T16:28:38.540Z 34.599 -116.663 4.342 3.01 ci3095346 1992-07-04T14:47:24.960Z 34.581 -116.581 4.672 3.33 ci3034657 1992-07-04T13:23:15.990Z 34.245 -116.744 1.504 3.12 ci3034625 1992-07-04T13:15:17.000Z 34.326 -116.412 4.592 3 ci3034622 1992-07-04T12:11:47.340Z 34.643 -116.659 3.832 3.25 ci3034601 1992-07-04T10:33:40.460Z 34.312 -116.429 5.792 3.44 ci3035065 1992-07-04T10:32:45.990Z 34.347 -116.469 6.782 3.43 ci3034560 1992-07-04T09:36:01.200Z 34.293 -116.887 1.483 3.45 ci3035032 1992-07-04T06:50:01.250Z 34.62 -116.615 4.862 3.17 ci3034471 1992-07-04T06:09:52.480Z 34.09 -116.857 1 3.02 ci3034457 1992-07-04T05:52:04.090Z 34.091 -116.38 0.842 3.14 ci3034453 1992-07-04T04:54:15.430Z 34.223 -116.774 0.997 3.11 ci3034431 1992-07-04T04:48:50.890Z 33.928 -116.328 1.937 3.34 ci3034430 1992-07-04T02:32:00.060Z 34.089 -116.856 0.72 3.21 ci3034362 1992-07-04T00:12:09.490Z 33.994 -116.374 0.117 3.03 ci3034296 1992-07-03T23:02:57.360Z 34.015 -116.338 -0.373 3.01 ci3034261 1992-07-03T22:58:30.850Z 34.21 -116.838 4.134 3.01 ci3034257 1992-07-03T22:25:41.670Z 34.073 -116.421 -0.997 3.12 ci3034344 1992-07-03T22:25:01.820Z 34.575 -116.455 4.399 3.31 ci3034238 1992-07-03T22:04:25.110Z 34.511 -116.54 0.461 3.29 ci3034479 1992-07-03T21:52:20.520Z 34.056 -116.381 1.076 3.37 ci3034478 1992-07-03T21:18:22.960Z 34.619 -116.644 3.542 3.83 ci3034218 1992-07-03T20:58:02.340Z 34.542 -116.552 2.641 3.15 ci3034209 1992-07-03T20:52:46.210Z 34.292 -116.721 -1.612 3.72 ci3034207 1992-07-03T19:49:56.640Z 34.122 -116.415 0.574 3.9 ci3034177 1992-07-03T19:14:08.940Z 34.077 -116.413 -0.177 3.04 ci3034158 1992-07-03T18:30:44.310Z 34.261 -116.96 5.469 3.08 ci3224800 1992-07-03T18:15:59.190Z 34.281 -116.702 2.734 3.18 ci3034138 1992-07-03T17:17:06.410Z 34.262 -116.896 5.558 4.1 ci3034125 1992-07-03T16:32:20.710Z 33.983 -116.281 2.207 3.06 ci3034109 1992-07-03T14:46:44.730Z 34.094 -116.395 -0.063 3.16 ci3034082 1992-07-03T14:27:24.920Z 34.262 -116.899 4.874 3.27 ci3034076 1992-07-03T12:32:24.360Z 34.538 -116.534 3.451 3.48 ci3034047 1992-07-03T12:29:51.510Z 34.528 -116.539 -1.094 3.48 ci3034045 1992-07-03T12:15:42.500Z 34.179 -116.812 8 3.66 ci3034044 Project No. 544-23112 49
11-946
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-03T11:56:17.150Z 34.092 -116.4 -0.874 3.28 ci3034040 1992-07-03T11:40:27.480Z 33.944 -116.304 3.143 3.38 ci3034037 1992-07-03T10:53:50.320Z 33.941 -116.307 3.123 3.22 ci3034022 1992-07-03T10:40:07.600Z 34.201 -116.868 1.628 3.77 ci3034017 1992-07-03T10:35:35.410Z 34.632 -116.597 3.612 3.09 ci3034014 1992-07-03T10:30:01.140Z 34.058 -116.433 -0.009 3.87 ci3034013 1992-07-03T10:24:34.200Z 34.085 -116.386 -0.955 3.2 ci3034012 1992-07-03T09:33:23.170Z 34.621 -116.654 5.742 3.01 ci3034001 1992-07-03T08:42:08.040Z 33.986 -116.4 -0.553 3.13 ci3093142 1992-07-03T08:30:27.190Z 34.632 -116.522 1.952 3 ci3033984 1992-07-03T07:50:32.530Z 34.195 -116.799 1.134 3.4 ci3033974 1992-07-03T07:14:09.140Z 34.578 -116.727 5.734 3.17 ci3217138 1992-07-03T05:55:42.230Z 34.018 -116.349 2.012 3.42 ci3033926 1992-07-03T05:10:56.700Z 34.12 -116.992 2.339 3.04 ci3033907 1992-07-03T04:19:41.730Z 34.22 -116.788 0.987 3.4 ci3033887 1992-07-03T04:15:50.380Z 34.21 -116.771 8.677 4.08 ci3033884 1992-07-03T04:10:48.540Z 34.119 -116.416 1.846 3.42 ci3095614 1992-07-03T02:40:50.960Z 33.169 -115.645 4.239 3.88 ci3033898 1992-07-03T02:37:46.880Z 33.165 -115.642 4.787 3.03 ci3033848 1992-07-03T01:38:36.720Z 34.574 -116.497 5.093 3.34 ci3033825 1992-07-03T01:01:58.540Z 34.075 -116.393 2.083 3 ci3033803 1992-07-02T21:03:22.550Z 34.202 -116.782 0.386 3.52 ci3033682 1992-07-02T20:49:24.870Z 33.982 -116.347 2.223 3.2 ci3033679 1992-07-02T19:59:43.550Z 34.126 -116.415 1.315 3.52 ci3033655 1992-07-02T18:53:49.020Z 34.241 -116.392 -0.944 3.49 ci3115354 1992-07-02T18:34:26.170Z 34.384 -116.458 1.722 3.91 ci3033964 1992-07-02T18:33:42.150Z 34.037 -116.357 3.739 3.1 ci3033612 1992-07-02T18:21:39.520Z 34.045 -116.35 0.491 3.61 ci3033956 1992-07-02T18:20:10.500Z 34.043 -116.351 0.291 3.51 ci3033609 1992-07-02T16:32:46.560Z 34.341 -116.67 -1.374 3.19 ci3033562 1992-07-02T16:27:56.580Z 34.341 -116.67 -1.444 3.84 ci3033561 1992-07-02T16:08:24.640Z 34.119 -116.994 2.929 3 ci3033549 1992-07-02T15:11:56.810Z 34.036 -116.352 0.271 3.37 ci3033518 1992-07-02T12:56:32.940Z 34.548 -116.544 5.093 3.07 ci3033461 1992-07-02T12:17:41.600Z 34.573 -116.576 4.9 3.52 ci3033805 1992-07-02T12:16:46.980Z 34.589 -116.614 4.484 3.51 ci3033804 1992-07-02T11:54:49.400Z 34.614 -116.622 4.896 3 ci3033433 1992-07-02T11:31:24.040Z 34.073 -116.422 -0.954 3.7 ci3033421 1992-07-02T10:51:31.660Z 34.584 -116.553 4.921 3.17 ci3033397 1992-07-02T10:43:55.310Z 33.922 -116.295 -0.863 3.38 ci3033396 1992-07-02T09:51:59.610Z 34.514 -116.524 5.093 3.89 ci3033371 1992-07-02T09:49:28.070Z 34.608 -116.638 4.484 3.01 ci3033566 1992-07-02T09:42:09.190Z 34.098 -116.992 1.319 3.47 ci3033503 Project No. 544-23112 50
11-947
HISTORICAL EARTHQUAKES 1932 TO PRESENT
MAGNITUDE > 3.0 (100 KILOMETER SEARCH RADIUS)
UNITED STATES GEOLOGICAL SURVEY (2023)
DATE/TIME LATITUDE LONGITUDE DEPTH MAGNITUDE ID
1992-07-02T08:45:27.740Z 34.423 -116.534 1.202 3.5 ci3033344 1992-07-02T08:25:04.530Z 34.003 -116.387 0.051 3.01 ci3033330 1992-07-02T08:13:51.490Z 34.118 -116.992 2.809 3.32 ci3033328 1992-07-02T07:56:26.340Z 34.138 -116.857 1.1 3.63 ci3033319 1992-07-02T06:24:57.150Z 34.258 -116.739 1.688 3.63 ci3033282 1992-07-02T06:13:43.540Z 34.132 -116.857 6.049 3.54 ci3033486 1992-07-02T05:16:32.640Z 34.383 -116.451 5.05 3.94 ci3033256 1992-07-02T04:12:12.490Z 34.395 -116.454 5.05 3.2 ci3033227 1992-07-02T03:51:00.120Z 34.626 -116.686 -1.117 3.06 ci3033217 1992-07-02T03:33:45.830Z 34.281 -116.707 -0.352 3.11 ci3033209 1992-07-02T03:31:18.180Z 34.032 -117.12 4.038 3.07 ci3033742 1992-07-02T02:39:36.520Z 34.612 -116.654 -1.278 3.13 ci3033184 1992-07-02T02:29:15.910Z 34.157 -116.828 4 3.09 ci3033177 1992-07-02T02:15:43.050Z 34.175 -116.413 4.532 3.01 ci3033171 1992-07-02T01:51:11.890Z 33.979 -116.338 -0.22 3.41 ci3033161 1992-07-02T01:12:47.150Z 34.628 -116.663 3.827 3.07 ci3093713 1992-07-02T00:16:22.390Z 34.313 -116.445 5.101 3.97 ci3033120 1992-07-01T23:50:50.320Z 34.008 -116.374 0.131 3.55 ci3033106 1992-07-01T23:46:47.170Z 34.343 -116.468 0.352 3.58 ci3033105 1992-07-01T22:58:42.020Z 34.161 -116.402 -1.018 3.66 ci3033087 1992-07-01T21:54:06.650Z 33.98 -116.348 2.07 3.15 ci3033048 1992-07-01T21:47:53.290Z 34.018 -116.366 1.69 3 ci3033046 1992-07-01T20:53:56.750Z 34.281 -116.731 -0.472 4.03 ci3033016 1992-07-01T20:46:17.800Z 34.276 -116.729 -0.892 4.24 ci3033670 1992-07-01T20:45:45.870Z 34.282 -116.725 -1.006 3.5 ci3033015 1992-07-01T20:41:18.440Z 34.258 -116.45 5.104 3.35 ci3033012 1992-07-01T20:22:51.970Z 34.341 -116.458 5.104 3.5 ci3033008 1992-07-01T19:36:28.170Z 34.172 -116.411 -0.825 3.23 ci3033212 1992-07-01T18:55:44.800Z 34.571 -116.567 4.932 3.05 ci3032972 1992-07-01T18:25:22.430Z 34.441 -116.51 -0.279 3.86 ci3032962 1992-07-01T18:15:11.610Z 34.213 -116.865 1.678 3.3 ci3032958 1992-07-01T18:07:33.950Z 34.582 -116.585 4.921 3.33 ci3032952 1992-07-01T17:45:46.850Z 34.28 -116.689 4.844 4.42 ci3032948 1992-07-01T17:13:46.680Z 34.301 -116.833 0.705 3.23 ci3032930 1992-07-01T17:07:15.080Z 34.274 -116.692 2.944 4.18 ci3032928 1992-07-01T15:48:04.520Z 34.626 -116.551 4.896 3.06 ci3032887 1992-07-01T15:21:39.910Z 34.156 -116.595 -0.634 3 ci3032873 1992-07-01T15:08:38.770Z 34.182 -116.409 4.904 3.21 ci3089438 1992-07-01T15:07:07.570Z 34.136 -116.436 0.909 3.41 ci3032869 1992-07-01T14:42:05.240Z 34.137 -116.958 2.308 3 ci3032837 1992-07-01T12:02:27.430Z 34.117 -116.386 -0.987 3.21 ci3032759 1992-07-01T11:58:42.910Z 34.188 -116.901 1.198 3.42 ci3032758 1992-07-01T11:58:01.920Z 34.203 -116.797 1.444 3.23 ci3089617 Project No. 544-23112 51
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