Napa City Council
September 2, 2025

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

FIGURES

" SITE
1_109558001_SL.mxd 9/3/2024 JDL
NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCE: ESRI WORLD TOPO, 2024

SITE LOCATION
o
! 0 1,500 3,000
FEET
FIGURE 1
UV128
UV29
UV128
UV29
UV12
UV121

MAP INDEX
Napa
County
109558001 | 10/24

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
" ~
,.,,
iii
f
0 (lj
,,o,
,::'?
~
~
Geotechnlcal & Environmental Sciences Consultants
t-1'9 .ird Or
"' 1/) ,. s r,ng 'L'.
? "'
a
,490fl
pr'i d}
0 j/
r,
~ Iii
Per.i.1-,oya l St
Republc Av
Lo nJon Way
.. ,.
<[ a::
::::
~
E
II) .;
~ c I...Jred St 1 ~ C
a:: _, < >,
C §
.9 ., ;; a.

@?&
@?& @?&
175
165
155
145
135
185
115
135
1 2
5 105
95 105
125
MW-3
MW-2 MW-1
LEGEND

PASCALE PLACE
@?& LANDFILL GAS WELL (SCS ENGINEERS, 2020)
MW-3
2_109558001_SP.mxd 9/3/2024 JDL NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCES: SITE PLAN - SCS ENGINEERS, DATED: 2-26-20; TOPO - NOAA/USGS LIDARNOAA LIDAR, 2018-2019, NORTHERN CALIFORNIA WILDFIRE-QL2; GOOGLE EARTH, 2024

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
109558001 | 10/24
o

SITE PLAN
FIGURE 2
050 100
FEET
FLAG

SECTION
LOT 6
LOT 5
LOT 9
LOT 10
LOT 11
LOT 12
LOT 13

GLORY COURT
PARCEL A BOUNDARY APN: 045-411-022-000(SCS ENGINEERS, 2020) @
@

PARCEL BOUNDARYAPPROXIMATE LIMIT OF CAP
ADAPTED FROM LANGAN (2018)
LOT 7
LOT 8
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
"
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
"
JVin90& J\'\Oore
Geotechnical & Environmental Sciences Consultants
;
I
I
I
I
\
\
\
\
;
,,-... ,,,"'
----
\
\
\
\
\
\
I
I
D

ATTACHMENT 4
175
165
155
145
135
185
115
135
125
105
95 105
125
MW-3
MW-2 MW-1
LEGEND
LANDFILL GAS WELL (SCS ENGINEERS, 2020)
MW-3
3_109558001_PRA.mxd 10/15/2024 JDL
NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCES: GRADING PLAN - CITY OF NAPA, DATED: MARCH 21, 2024; TOPO - NOAA/USGS LIDARNOAA LIDAR, 2018-2019, NORTHERN CALIFORNIA WILDFIRE-QL2; GOOGLE EARTH, 2024

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
109558001 | 10/24

PLANNED REMEDIAL ACTION
FIGURE 3
050 100
FEET

2 FOOT SOIL CAP OVER RECONSOLIDATED WASTE
1’-0" SOIL COVER OVER EXISTING CAP

SOIL FILL FOR DRAINAGE

RELOCATED WASTE
(APPROXIMATE WASTE STOCKPILE = 495 CY)
WASTE REMOVAL (<10")
WASTE REMOVAL (10" - 20")

CALLANDER ASSOCIATES LANDSCAPE ARCHITECTURE,
(OCTOBER, 2024)
PARCEL A BOUNDARY APN: 045-411-022-000

PARCEL BOUNDARY

PASCALE PLACE
FLAG

SECTION
LOT 8
LOT 7
LOT 5
LOT 9
LOT 10
LOT 11
LOT 12
LOT 13

GLORY COURT

APPROXIMATE LIMIT OF CAP
ADAPTED FROM LANGAN (2018)
LOT 6
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS

VERTICAL CLIFF

NO WASTE REMOVAL

EAST OF CLIFF
Geotechnical & Environmental Sciences Consultants
;
;
I
I
I
I
\
\
\
\
\
.-- ; ;
_..,,,/ ---------
r- - -,
I __ I
~
~
D
D
D

175
165
155
145
135
185
115
135
125
105
95 105
125
MW-3
MW-2 MW-1
LEGEND
LANDFILL GAS WELL (SCS ENGINEERS, 2020)
MW-3
4_109558001_OSWAlt.mxd 10/14/2024 JDL
NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCES: GRADING PLAN - CITY OF NAPA, DATED: MARCH 21, 2024; TOPO - NOAA/USGS LIDARNOAA LIDAR, 2018-2019, NORTHERN CALIFORNIA WILDFIRE-QL2; GOOGLE EARTH, 2024

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
109558001 | 10/24

PLANNED REMEDIAL ACTION - OFFSITE WASTE GRADING OPTION
FIGURE 4
050 100
FEET

PARCEL A BOUNDARY APN: 045-411-022-000

PARCEL BOUNDARY

PASCALE PLACE
FLAG

SECTION
LOT 8
LOT 7
LOT 5
LOT 9
LOT 10
LOT 11
LOT 12
LOT 13

GLORY COURT
LOT 6
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS

VERTICAL CLIFF

NO WASTE REMOVAL

EAST OF CLIFF

CALLANDER ASSOCIATES LANDSCAPE ARCHITECTURE,
(OCTOBER, 2024)

APPROXIMATE LIMIT OF CAP
ADAPTED FROM LANGAN (2018)

RELOCATED WASTE
(APPROXIMATE WASTE STOCKPILE = 2,700 CY)
SOIL TOP COVER < 4’
SOIL TOP COVER 4-5’
SOIL TOP COVER 5-6’
WASTE REMOVAL (<10")
WASTE REMOVAL (10" - 20")
:-·-·, I •
____ J
-
-
~ -
~
~~~f!.':,,.~00f oo~e
,ences Consultants

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX A
Closed Disposal Site Inspection Report Hidden Glen Dump 4/23/24

Inspection Information
Inspected By: Napa County Local Inspection ID:

Inspection Date: 4/23/2024 Time In: 8:30 AM
Inspection Type: Periodic Time Out: 9:30 AM
Inspector: Peter Ex Inspection Duration: 1.0
Operator:

Received By:

Also Present (Name):

Facility/Activity Information
Enforcement Agency: County of Napa SWIS Number: 28-AA-0028 Facility: Hidden Glen Dump
Coombsville Rd.

Napa, CA 99999
Activity: Solid Waste Disposal Site
Operational Status: Closed Regulatory Status: Unpermitted Land Owners(s):

The above facility was inspected for compliance with applicable sections of Division 30 of the Public Resources Code (PRC) and Title 14 and Title 27, California Code of Regulations (CCR).

No Violations
No Areas of Concern
Inspection Report Comments
City of Napa Property - No changes observed, however, soil and debris has been illegally disposed on the west side of the property from the Dayan property. See notes below.

Dayan Property - Ms. Dayan has proceeded with further grading and landscaping development of her property despite an agreement in principle via submittal of a Work Plan.

New plants and soil/mulch was observed in the front yard. Ms. Dayan has additionally illegally disposed of the soil previously stockpiled on her property onto the adjacent City of Napa property. Access of machinery was observed to have gone through the adjacent Anderson property as evidenced by recent vegetation disturbance by equipment tracks.

Closed Disposal Site Inspection Report (188)
Hidden Glen Dump (28-AA-0028)
4/23/2024
CalRecycle Solid Waste Information System (SWIS) Page 1 of 2 Date Generated: May 22, 2024 9:46 AM

LEA had intended to provide comments to the Work Plan submitted by Ms. Dayan with the understanding that no further work would continue until the Work Plan was approved by LEA.

City of Napa staff was notified of the illegally dumped material on their property.

Numerous photos were taken with a few attached to this report.

Attachments
Dayan - Back Yard Illegal Dumping 4-23-24
Dayan - Back Yard w Art Turf Install 4-23-24
Dayan - Front Yard 4-23-24
Closed Disposal Site Inspection Report (188)
Hidden Glen Dump (28-AA-0028)
4/23/2024
CalRecycle Solid Waste Information System (SWIS) Page 2 of 2 Date Generated: May 22, 2024 9:46 AM

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX B
Architect Grading Plans

NONE
1 NONE

SHEET INDEX
NO. DESCRIPTION

1.0 COVER SHEET

1.1 COVER SHEET - NOTES

2.0 DEMOLITION PLAN

3.0 - 3.2 EROSION CONTROL PLAN

4.0 - 4.2 WASTE EXCAVATION PLAN AND SECTIONS

5.0 - 5.3 GRADING PLAN AND SECTIONS

6.0 CONSTRUCTION DETAILS

7.0 TOPOGRAPHIC SURVEY

PREPARED BY

LANDSCAPE ARCHITECT
Callander Associates Landscape
Architecture, Inc.
12150 Tributary Point Drive, Suite 140
Gold River, CA 95670
Phone: (916) 985-4366

PREPARED FOR

CITY OF NAPA
Utilities Department
1700 Second Street, Suite 100
Napa, CA 94559
NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY

PLANS PREPARED UNDER
THE DIRECTION OF _______________________________ ________ HORIZ.

SCALE OR SONOMA HWY 121
HIGHWAY 29 TO YOUNTVILLE

TO YOUNTVILLE
IMOLA AVE.

FIRST AVE.

HAGEN RD.

SILVERADO TRAIL
HILLCREST DR.

HARDMAN AVE. ATLAS PEAK RD. WESTGATE DR.

TULOCAY CREEK

SALVADOR DRAINAGE CHANNEL
ST.

WAY
NAPA

CABOT WAY
IMOLA AVE.

FOSTER RD. FOOTHILL BLVD.

BIG RANCH RD.

SARCO CREEK MILLIKEN CREEK
MAGNOLIA DR.

SOSCOL AVE.

SPRUCE ST.

COOMBS ST.

PEARL ST.

BROWN
YAJOME ST.

IMPERIAL WAY
EAST FIRST ST.

LINCOLN AVE.

TRANCAS ST.

CALISTOGA
PINE ST.

SECOND ST. FIRST ST.

LAUREL ST.

KILBURN AVE.

CREEK
NAPA
PARTRICK RD. LONE OAK AVE.

REDWOOD
BROWNS VALLEY RD.

REDWOOD RD.

OXFORD ST.

JEFFERSON ST.

EL CENTRO AVE.

TROWER AVE.

LINDA VISTA AVE.

WINE COUNTRY AVE. EL CENTRO AVE.

SALVADOR AVE.

ORCHARD AVE.

CREEKAUSTIN WAY

PROJECT SITE
N T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_CV.dwg DRAWN BY:

DESIGNED BY:

CHECKED BY:

DATE
DATE
DATE

CITY OF NAPA

DEPARTMENT

HIDDEN GLEN DUMP REMEDIATION
CITY PROJECT NO. C2023-083

1.0 SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF

TO CALISTOGA

TROWER AVENUE

TO SACRAMENTO

CORDELIA

TO SAN FRANCISCO

CITY OF

AMERICAN CANYON

TO SONOMA

IMOLA AVENUE

FIRST STREET

APPROVED

APPROVAL RECOMMENDED
VERT.

RH/OP
BS
MR
5/22/24

PASCALE PLACE SOSCOL AVENUE

EXISTING CONDITIONS LEGEND
FENCE

PROPERTY LINE

APPROXIMATE LIMITS OF LANDFILL CAP

FLOWLINE OF ROCK SWALE

WATER LINE

SANITARY SEWER LINE

ELECTRICAL LINE

AT&T COMMUNICATION LIINE

DRAIN INLET

WATER VALVE

WATER METER
TREE

SEWER CLEANOUT
CONTOUR, 1'-0" INTERVALS
NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK
Melissa Ruth, No. 5425 DATE

PLANS PREPARED UNDER
THE DIRECTION OF _______________________________ ________

TO SONOMA

CONGRESS VALLEY RD TO VALLEJO

NAPA RIVER
HIGHWAY 121
RIVER
NAPA SHURTLEFF AVE. TERRACE DR COOMBSVILLE RD.

VICHY RD.

MONTICELLO RD.

CENTRAL AVE.

C ST.

YORKST.

LAUREL ST. COLLEGE
STREBLOW DR.

OLD SONOMA RD. PATTON AVE. TERRACE DR. SHETLER
KANSAS AVE.

SOUZA LN.

FRANKLIN ST.

VALLEJO ST. HAYES ST.

JEFFERSON ST.

MAIN ST.

JUAREZ ST.

SILVERADO TRAIL EAST AVE.

CALIFORNIA BLVD. PUEBLO AVE.

THIRD ST.

FREEWAY DR.

AVE.

THOMPSON
BUHMAN AVE. BROWNS VALLEY RD.

CREEK
WEST PUEBLO AVE.

YOUNG AVE.

VINE HILL DR. PINOT ST. DRY CREEK RD.

MAHER ST.

SOLANO AVE. SOSCOL AVE.

AVE.

BROWNS VALLEY
SOLANO AVE.

N

SITE MAP

NOT TO SCALE
15 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_CV.dwg OCTOBER 14, 2024
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF

SALVADOR AVENUE

TRANCAS STREET REDWOOD ROAD

LINCOLN AVENUE
NAPA

AREA MAP

NOT TO SCALE

PROJECT AREA

TO VALLEJO

JAMESON

CANYON ROAD

AMERICAN CANYON ROAD
10/14/24
5/22/24
A17058_CV.dwg

COOMBSVILLE
ROAD
5/22/24
TOTAL PROJECT AREA: 1.66 ACRES
TOTAL SITE DISTURBANCE: 1.60 ACRES
PERMIT REQUIREMENTS:
- CONSTRUCTION GENERAL PERMIT (SWPPP)
Know what'sbelow.

Call before you dig.

R HIDDEN GLEN DUMP REMEDIATION

TITLE SHEET
'29 ' 121 '
• 21 50 Tri':iutary r'oint IJ'i'~o, Suite 11:l
Gol,d Ritter Cl\ 9~J6
I 916,985/1365

UTILITIES
\
----~---,;,-~- ~
I
'
I, ''

UTILITIES DEPARTMENT
-x-
--55--
1111
coe
--120--

NONE
2 NONE
NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY

PLANS PREPARED UNDER
THE DIRECTION OF _______________________________ ________ HORIZ.

SCALE T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_CV.dwg DRAWN BY:

DESIGNED BY:

CHECKED BY:

DATE
DATE
DATE

HIDDEN GLEN DUMP REMEDIATION

TITLE SHEET - NOTES

1.1 SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
BS
MR
NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK
Melissa Ruth, No. 5425 DATE

PLANS PREPARED UNDER
THE DIRECTION OF _______________________________ ________ 14 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_CV.dwg SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
A17058_CV.dwg
Know what'sbelow.

Call before you dig.

R

1. DESIGN INTENT: THESE DRAWINGS REPRESENT THE GENERAL DESIGN INTENT TO BE IMPLEMENTED ON THE SITE. CONTRACTOR SHALL BE RESPONSIBLE FOR

CONTACTING OWNER'S REPRESENTATIVE FOR ANY ADDITIONAL

CLARIFICATION OR DETAILS NECESSARY TO ACCOMMODATE SITE
CONDITIONS.

2. CONTRACTOR COORDINATION: EACH CONTRACTOR SHALL COORDINATE

AND OTHERWISE INTEGRATE WORK WITH THAT OF OTHERS IN AN EFFICIENT

AND TIMELY MANNER SO AS TO PROVIDE THE OWNER WITH A
WELL-CONSTRUCTED, EASILY MAINTAINABLE PROJECT. EACH CONTRACTOR

SHALL NOTIFY OTHERS AT LEAST TWO WORKING DAYS IN ADVANCE OF COVERING, COMPLETING, OR EXPOSING WORK TO BE INSTALLED BY OTHERS.

3. CONTRACTORS' JOB SITE CONDITIONS: CONTRACTOR AGREES TO ASSUME

SOLE AND COMPLETE RESPONSIBILITY FOR SITE CONDITIONS DURING CONSTRUCTION, INCLUDING SAFETY OF ALL PERSONS AND PROPERTY; THAT

THIS REQUIREMENT SHALL APPLY CONTINUOUSLY AND NOT BE LIMITED TO NORMAL WORKING HOURS; AND THAT THE CONTRACTOR SHALL DEFEND,

INDEMNIFY, AND HOLD THE OWNER AND THE LANDSCAPE ARCHITECT

HARMLESS FROM ANY AND ALL LIABILITY, REAL OR ALLEGED, IN

CONNECTION WITH THE PERFORMANCE OF WORK ON THIS PROJECT,

EXCEPTING FOR LIABILITY ARISING FROM THE SOLE NEGLIGENCE OF THE OWNER OR THE LANDSCAPE ARCHITECT.

4. COMPOSITE BASE SHEET: THE PROPOSED IMPROVEMENTS SHOWN ON THESE DRAWINGS ARE SUPERIMPOSED ON A BASE SHEET. THIS BASE SHEET IS

COMPILED FROM THE TOPOGRAPHIC SURVEY, OTHER ARCHITECTURAL

AND/OR ENGINEERING DOCUMENTS, AND OTHER DATA AS MADE
AVAILABLE TO THE LANDSCAPE ARCHITECT. THIS BASE SHEET INFORMATION IS SHOWN IN HALF TONE ON THE PLANS. THE LANDSCAPE ARCHITECT SHALL

NOT BE HELD LIABLE FOR CHANGES, INACCURACIES, OMISSIONS, OR OTHER ERRORS ON THESE DOCUMENTS. THE COMPOSITE BASE SHEET IS PROVIDED AS

AN AID ONLY AND THE CONTRACTOR SHALL BE RESPONSIBLE FOR

REVIEWING THESE DOCUMENTS AND INCORPORATING/INTEGRATING ALL CONSTRUCTION AS REQUIRED TO ACCOMMODATE SAME.

THE BASE SHEET SOURCE FOR THESE DRAWINGS IS:

TOPOGRAPHIC MAP OF HIDDEN GLEN PARK, SUBDIVISION PARCEL "A", SHEET 1, APN: 045-411-022-000, PREPARED BY CHAUDHARY & ASSOCIATES, INC., AUGUST 1ST 2023, (707)255-2729

5. UTILITIES: PRIOR TO CONSTRUCTION, THE CONTRACTOR IS RESPONSIBLE FOR

CONTACTING THE UTILITY COMPANIES INVOLVED AND REQUESTING A VISUAL VERIFICATION OF THE LOCATIONS OF THEIR UNDERGROUND FACILITIES. THE

UTILITY COMPANIES ARE MEMBERS OF THE UNDERGROUND SERVICE ALERT (U.S.A.) ON-CALL PROGRAM. THE CONTRACTOR OR ANY SUBCONTRACTOR FOR THIS CONTRACT SHALL NOTIFY MEMBERS OF THE U.S.A. 48 HOURS IN

ADVANCE OF PERFORMING EXCAVATION WORK BY CALLING THE TOLL-FREE NUMBER 811. EXCAVATION IS DEFINED AS BEING 18 OR MORE INCHES IN DEPTH BELOW THE EXISTING SURFACE.

THE CONTRACTOR IS CAUTIONED THAT ONLY EXCAVATION WILL REVEAL THE

TYPES, EXTENT, SIZES, LOCATION, AND DEPTHS OF SUCH UNDERGROUND UTILITIES. HOWEVER, THE LANDSCAPE ARCHITECT CAN ASSUME NO

RESPONSIBILITY FOR THE COMPLETENESS OR ACCURACY OF ITS DELINEATION

OF SUCH UNDERGROUND UTILITIES, NOR FOR THE EXISTENCE OF OTHER BURIED OBJECTS OR UTILITIES WHICH ARE NOT SHOWN ON THESE DRAWINGS.

6. TREE PROTECTION AND MAINTENANCE REQUIREMENTS: ALL TRENCHING

WITHIN THE DRIPLINE OF EXISTING TREES TO REMAIN SHALL BE BY HAND, WITH CARE TAKEN NOT TO CUT OR DAMAGE ROOTS OVER 1-INCH DIAMETER.

TREES TO REMAIN SHALL BE FENCED WITH TEMPORARY FENCING, SUCH AS STEEL STAKES (MAX. 5 FEET O.C.) WITH WIRE MESH FABRIC (6X6 OPEN), CHAINLINK, OR SIMILAR, HEIGHT TO BE 5 FEET MINIMUM.

GENERAL NOTES

1. ALL WORKMANSHIP AND MATERIALS FOR BOTH ON-SITE AND OFF-SITE

IMPROVEMENTS SHALL CONFORM TO THE MOST RECENT EDITION OF THE CITY OF NAPA STANDARD SPECIFICATIONS AND ADDENDUMS, AND/OR THE 2015 EDITION

OF THE STATE OF CALIFORNIA STANDARD SPECIFICATIONS, STANDARD PLANS, AND THE GEOTECHNICAL REPORT AND ALL THE NOTES SHOWN. THE CONTRACTOR SHALL HAVE A COPY OF ALL DOCUMENTS AVAILABLE AT THE JOB SITE AT ALL TIMES.

ALL ON SITE IMPROVEMENTS SHALL BE INSPECTED AND CERTIFIED BY THE ENGINEER OF RECORD. IMPROVEMENTS IN THE PUBLIC RIGHT OF WAY SHALL BE INSPECTED BY THE CITY OF NAPA.

2. THE CONTRACTOR SHALL CONTACT THE UTILITIES DEPARTMENT AT 707-257-9521 TO

SCHEDULE A PRECONSTRUCTION MEETING PRIOR TO THE COMMENCEMENT OF ANY AND ALL WORK. DURING THE DURATION OF THE PROJECT, ROLLING 3-WEEK LOOK AHEAD SCHEDULES WILL BE REQUIRED TO BE SUBMITTED WEEKLY.

3. THE CONTRACTOR AND ALL SUBCONTRACTORS MUST CALL UNDERGROUND SERVICE ALERT (USA NORTH 811 OR 1-800-227-2600) PRIOR TO THE START OF ANY WORK ON THE PROJECT SITE. EACH CONTRACTOR SHALL SUBMIT A COPY OF THEIR USA TAG TO THE CITY FOR VERIFICATION. THE CONTRACTOR SHALL ALSO CALL

ANY COMPANY OR AGENCY FOR SERVICE LOCATIONS WHO ARE NOT A MEMBER OF UNDERGROUND SERVICE ALERT. CONTRACTOR SHALL BE RESPONSIBLE FOR THE VERIFICATION OF ALL EXISTING UTILITIES IN THE FIELD. LOCATIONS OF UTILITIES AND

UNDERGROUND FACILITIES SHOWN ARE APPROXIMATE AND FOR GENERAL INFORMATION ONLY. THE CONTRACTOR IS RESPONSIBLE FOR REMOVING U.S.A.

MARKINGS AFTER THE COMPLETION OF CONSTRUCTION FROM THE PUBLIC RIGHT OF WAY.

4. THE CONTRACTOR SHALL COORDINATE ALL NECESSARY UTILITY INSPECTIONS, SCHEDULING AND RELOCATIONS WITH THE APPROPRIATE UTILITY COMPANIES.

5. ALL WORK SHALL BE IN ACCORDANCE WITH THE PREVAILING GOVERNING AGENCY. FOR DISCREPANCIES BETWEEN THESE PLANS AND THOSE AGENCIES' REGULATIONS AND STANDARD PLANS, AGENCY REQUIREMENTS SHALL PREVAIL.

6. THE CONTRACTOR SHALL PROVIDE A MINIMUM OF TWO - 24 HOUR A DAY

EMERGENCY TELEPHONE NUMBERS OF THE PERSON(S) WHO CAN RESPOND TO THE PROJECT.

7. ALL MATERIALS SHALL BE FURNISHED AND INSTALLED BY THE

DEVELOPER/CONTRACTOR UNLESS OTHERWISE NOTED ON THE PLANS OR SPECIFICATIONS.

8. CONTRACTOR SHALL CONFORM TO EXISTING STREETS, SURROUNDING LANDSCAPE

AND OTHER IMPROVEMENTS WITH A SMOOTH TRANSITION IN PAVING, CURBS, GUTTERS, SIDEWALKS, GRADING, ETC., AND TO AVOID ANY ABRUPT OR APPARENT

CHANGES IN GRADES OR CROSS SLOPES, LOW SPOTS OR HAZARDOUS CONDITIONS.

9. FOR ALL CONSTRUCTION ACTIVITIES INCLUDING BUT NOT LIMITED TO: GRADING,

FENCING, RETAINING WALLS, TREE TRIMMING, STORM DRAINAGE, OR ANY OTHER

TYPE OF WORK, THE DEVELOPER/CONTRACTOR SHALL PROVIDE THE CITY A

RIGHT-OF-ENTRY/TEMPORARY CONSTRUCTION EASEMENT SIGNED BY THE OWNER

OF RECORD OF THE AFFECTED/ADJACENT PROPERTY PRIOR TO START OF CONSTRUCTION.

10. THE CONTRACTOR SHALL NOTIFY ALL CUSTOMERS OF SERVICE INTERRUPTIONS 48 HOURS IN ADVANCE WITH DOOR HUNG NOTICES. INTERRUPTION SCHEDULING SHALL BE AUTHORIZED IN WRITING BY WATER DIVISION ENGINEER.

11. CONSTRUCTION ACTIVITIES THROUGHOUT THE ENTIRE DURATION OF THE PROJECT SHALL BE LIMITED TO THE HOURS OF 7:00 A.M. TO 7:00 P.M., MONDAY THROUGH FRIDAY. THERE SHALL BE NO STARTUP OF MACHINES NOR EQUIPMENT PRIOR TO 8:00 A.M., MONDAY THROUGH FRIDAY; NO DELIVERY OF MATERIALS NOR EQUIPMENT PRIOR TO 7:30A.M. NOR PAST 5:00P.M., MONDAY THROUGH FRIDAY; NO CLEANING OF MACHINES NOR EQUIPMENT PAST 6:00 P.M., MONDAY THROUGH FRIDAY; NO SERVICING OF EQUIPMENT PAST 6:45 P.M., MONDAY THROUGH FRIDAY; AND CONSTRUCTION ON WEEKENDS OR LEGAL HOLIDAYS SHALL BE LIMITED TO THE HOURS OF 8:00 A.M. TO 4:00 P.M., UNLESS THE

CONTRACTOR SUBMITS A WRITTEN REQUEST AND THAT REQUEST IS APPROVED BY THE CITY MANAGER, OR THEIR DESIGNEE, PURSUANT TO SECTION 8.08.025 &

8.08.050 OF THE CITY MUNICIPAL CODE. IF THE REQUEST TO WORK OUTSIDE OF THE

DESIGNATED HOURS IS APPROVED, THE CONTRACTOR MAY BE REQUIRED TO PAY

THE COST OF PROVIDING INSPECTION SERVICES FOR THE WORK BEING PERFORMED. IF INSPECTION SERVICES ARE NOT AVAILABLE FOR THE REQUESTED CHANGE, THE CITY ENGINEER MAY DENY THE REQUEST. THE CITY MANAGER, OR DESIGNEE, SHALL GRANT SUCH PERMIT:

A. FOR EMERGENCY WORK;
B. OTHER WORK, IF WORK AND EQUIPMENT WILL NOT CREATE NOISE THAT MAY BE UNREASONABLY OFFENSIVE TO NEIGHBORS AS TO CONSTITUTE A NUISANCE; OR C. IF NECESSARY TO PROTECT THE PUBLIC HEALTH, SAFETY, AND WELFARE.

ALL MUFFLER SYSTEMS ON CONSTRUCTION EQUIPMENT SHALL BE PROPERLY MAINTAINED. ALL CONSTRUCTION EQUIPMENT SHALL NOT BE PLACED ADJACENT

TO DEVELOPED AREAS UNLESS SAID EQUIPMENT IS PROVIDED WITH ACOUSTICAL SHIELDING. ALL CONSTRUCTION AND GRADING EQUIPMENT SHALL BE SHUT DOWN WHEN NOT ACTIVELY IN USE.

IF AN INSPECTOR IS REQUIRED TO BE ONSITE FOR WORK OUTSIDE OF THE MONDAY

THROUGH FRIDAY WORK HOURS, THE CONTRACTOR SHALL REQUEST FROM THE CITY, IN WRITING, 72 HOURS PRIOR TO THE WORK, FOR APPROVAL. IF PRIOR

WRITTEN NOTICE IS NOT PROVIDED, THE REQUEST WILL BE DENIED, AND CONSTRUCTION WORK MAY NOT BE PERFORMED. ADDITIONAL FEES MAY BE CHARGED FOR WORK OUTSIDE OF THE MONDAY THROUGH FRIDAY WORK HOURS.

THE CITY RESERVES THE RIGHT TO DENY ALL WORK OUTSIDE OF THE MONDAY THROUGH FRIDAY WORK HOURS.

DEVELOPER/CONTRACTORS WILL BE GIVEN ONE (1) WARNING FOR WORK STARTING PRIOR TO OR AFTER THE WORK HOURS STATED ABOVE. AFTER THE FIRST

WARNING IS GIVEN, ANY VIOLATIONS OF TIME WILL RESULT IN AN AUTOMATIC FIVE (5) WORKING DAY SHUTDOWN OF THE ENTIRE PROJECT.

NO STAGING OR DELIVERIES IN THE PUBLIC RIGHT OF WAY UNLESS APPROVED PER WRITTEN REQUEST.

THE CITY ENGINEER, PLANNING COMMISSION OR CITY COUNCIL MAY IMPOSE

ADDITIONAL LIMITATIONS ON WORKING HOURS AND NOISE BASED ON THE

SPECIAL CIRCUMSTANCES THAT MAY BE ASSOCIATED WITH A PARTICULAR PROJECT. IN WHICH CASE, THE MORE STRINGENT LIMITATIONS SHALL APPLY.

12. THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE PROTECTION OF ALL EXISTING SURVEY MONUMENTS AND CONTROL POINTS. ALL MONUMENTS DESTROYED

DURING CONSTRUCTION SHALL BE RESURVEYED AND REPLACED BY THE

CONTRACTOR AND AT THE CONTRACTOR'S EXPENSE AS OUTLINED IN THE BUSINESS AND PROFESSIONS CODE, SECTION 8771.

13. THE CONTRACTOR SHALL PROVIDE THE CITY SUBMITTAL(S) FOR ALL MATERIAL TO BE INSTALLED WITHIN THE PUBLIC RIGHT OF WAY ON THE PROJECT. CONSTRUCTION SHALL NOT START PRIOR TO SUBMITTALS BEING APPROVED. PRIOR TO BEING

SUBMITTED TO THE CITY, THE DESIGNER OF RECORD SHALL REVIEW AND APPROVE SUCH RIGHT OF WAY SUBMITTAL.

14. SITE SECURITY, PERIMETER CONTROLS, AND SITE SAFETY ARE THE RESPONSIBILITY OF

THE DEVELOPER/CONTRACTOR AND SHALL BE INSTALLED AND MAINTAINED DURING ALL PHASES OF CONSTRUCTION. TEMPORARY 6FT CHAINLINK FENCING

WITH OPAQUE SCREENING SHALL BE USED FOR SITE SECURITY UNLESS ANOTHER METHOD IS SUBMITTED AND APPROVED FOR USE BY THE CITY.

CITY OF NAPA GENERAL CONSTRUCTION NOTES

RECORD DRAWING
DATE OF COMPLETION:

CONTRACTOR:

ENGINEER:

SURVEYOR:

GEOTECHNICAL:

ENGINEER OF RECORD:

STAMPED AND SIGNED BY:

1. ALL TRAFFIC CONTROL REQUIRED FOR CONSTRUCTION ACTIVITIES SHALL CONFORM TO THE REQUIREMENTS OF THE LATEST EDITION OF CA MUTCD.

FOR ALL LANE CLOSURES AND DETOURS, A TRAFFIC CONTROL PLAN SHALL BE

SUBMITTED TO THE CITY OF NAPA FOR REVIEW AND APPROVAL AT LEAST TEN WORKING DAYS BEFORE THE SCHEDULED CLOSURE. THE CITY WILL REVIEW ALL TRAFFIC CONTROL PLANS. CONSTRUCTION WILL NOT BE ALLOWED TO START PRIOR TO THE APPROVAL OF THE TRAFFIC CONTROL PLAN.

2. ALL TRAFFIC CONTROL PLANS SHALL BE A CAD DRAWING FORMAT PLAN WITH COMPLETE DETAILS AND TABLES. AERIAL PHOTOS, HAND DRAWN PLANS AND NOTES ARE NOT ACCEPTABLE.

3. NO PARKING SIGNS SHALL BE PLACED 48 HOURS PRIOR TO THE WORK TO BE COMPLETED WITHIN AN AREA OF DESIGNATED PUBLIC PARKING. NO

PARKING SIGNS SHALL BE FILLED IN WITH ALL PERTINENT INFORMATION OF THE EXACT TIME THE WORK IS TO TAKE PLACE. SIGNS SHALL BE CLEAR AS TO

WHEN THE PUBLIC MAY PARK IN THE AREA OUTSIDE OF THE CONSTRUCTION TIME. IF WORK IS STAGED OR DELAYED, THEN ALL NO PARKING SIGNS SHALL BE REMOVED AND NEW NO PARKING SIGNS SHALL BE PLACED 48 HOURS PRIOR TO WHEN WORK IS READY TO RESUME.

4. PEDESTRIAN AND BIKE ACCESS THROUGH AND/OR ADJACENT TO THE

PROJECT SITE SHALL REMAIN UNOBSTRUCTED DURING THE PROJECT

CONSTRUCTION OR A DETOUR ROUTE SHALL BE ESTABLISHED AS APPROVED BY THE CITY.

5. THE CONTRACTOR IS REQUIRED TO MAINTAIN ALL TRAFFIC CONTROL

EQUIPMENT IN-PLACE DURING WORK ACTIVITIES AND SHALL REMOVE ALL

TRAFFIC CONTROL THAT IS NOT NEEDED AND RETURN ACCESSIBLE TRAVEL FOR THE PUBLIC DURING NON-WORK HOURS OR DAYS.

6. THE CITY RESERVES THE RIGHT TO STOP ALL WORK BEING PERFORMED FOR

LACK OF TRAFFIC CONTROL OR TRAFFIC CONTROL THAT IS NOT PER THE APPROVED TRAFFIC CONTROL PLAN.

7. THE CONTRACTOR IS REQUIRED TO MAINTAIN ALL TEMPORARY PAVEMENT DELINEATION UNTIL THE PERMANENT PAVEMENT DELINEATION IS PLACED. ALL PERMANENT TRAFFIC STRIPING SHALL BE LAID OUT AND CAT-TRACKED. THE

CITY SHALL HAVE A MINIMUM OF TEN WORKING DAYS TO APPROVE THE STRIPING LAYOUT AND CAT-TRACKING.

TRAFFIC CONTROL NOTES

1. PRIOR TO PROJECT ACCEPTANCE, THE ENGINEER OF

RECORD, THE SURVEYOR OF RECORD, AND THE GEOTECH

OF RECORD SHALL SUBMIT AN ENGINEER'S STAMPED
CERTIFICATION LETTER TO THE CITY.

2. PRIOR TO PROJECT ACCEPTANCE ALL ITEMS ON THE

DEFICIENCY LIST SHALL BE CORRECTED AND SIGNED OFF BY
ALL DIVISIONS.

3. GEOTECH OF RECORD SHALL SUBMIT A FINAL REPORT AND

SUMMARY OF ALL TESTING AND DESIGN CHANGES PRIOR TO
ACCEPTANCE.

4. PRIOR TO PROJECT ACCEPTANCE, ACCURATE "RECORD
DRAWINGS" SHALL BE SUBMITTED TO THE CITY, STAMPED AND
SIGNED WITH THE FOLLOWING:

PROJECT ACCEPTANCE NOTES
5/22/24
10/14/24
5/22/24
5/22/24
OCTOBER 14, 2024
C 21 50 Tri:iutary r'oint IJ'i'~o, Suite 11:l
Gol,d Ritter Cl\ 9~J6
I 916,985/1365

UTILITIES DEPARTMENT
USE CF DOCl.lENTS
A. User acknowledges Callander Associates Landscape Architecture, lnc.'s (Callander Associates) construction documents, lncluclng electronlc flles, reports, plans, specifications, or other construction documents prepared by Callander Associates as Instruments of professlonal service and that these Instruments are Intended only for use on this pro Ject, and not any future phases or for other uses. The User shd not reuse or make any moclflcatlon to the construction documents without the prior written authorization of Callander Associates. In the event the User, the User's contractors or subcontractors, or anyone for whom the User la legally Hable, makes or permits to be made any changes to the construction documents without obtaining Callander Associates' prior written consent, the User shall assume full responslblllty for the results ol such changes.

B. The User agrees, to Indemnity and hold harmless Callander Associates, Its officers, directors, employees and subconsultants (collectlvely Callander Associates) against any damages, llabllltles or costs, lncludlng reasonable attorneys' fees and defense costs, arising from or allegedly arising from or In any way connected with the unauthorized reuse or moclflcatlon of the construction documents by the User, or any person or entity that acquires or obtains the construction documents from or through the User, without the written authorization of Callander Associates.

WPB
SD

SD WPB SL PGE SL
W
W
PGE
PG&E
SL

APPROXIMATE LIMIT
OF LANDFILL CAP.

APPROXIMATE LIMIT
OF LANDFILL CAP.

APPROXIMATE LIMIT
OF LANDFILL CAP.

TEMP. FENCE
TEMP. FENCE

POISON OAKS, SEE
DEMOLITION NOTE #3
1 2 3
4 9
12 12
7 6
12 7
8 10
11 5

1. CLEAR AND GRUB: CONTRACTOR SHALL CLEAR AND GRUB ALL EXISTING VEGETATION, UNLESS OTHERWISE INDICATED, AS REQUIRED FOR THE GRADING, SITE CONSTRUCTION, AND PLANTING OPERATIONS. LIMITS OF CLEARING SHALL BE REVIEWED WITH OWNER PRIOR TO COMMENCEMENT OF WORK. SEE SPECIFICATIONS FOR MORE INFORMATION.

CONTRACTOR SHALL REVIEW DEMOLITION, AND CLEARING AND GRUBBING REQUIREMENTS ON SITE WITH LANDSCAPE ARCHITECT PRIOR TO COMMENCING DEMOLITION OPERATIONS.

ALL DEMOLITION OPERATIONS WITHIN THE DRIP LINE OF TREES SHALL CONFORM TO TREE PROTECTION NOTES AND SPECIFICATIONS.

2. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

3. REMOVAL OF POISON OAK: CONTRACTOR SHALL NOTIFY ALL WORKERS TO WEAR SPECIFIC PPE GEAR AND USE THE APPROPRIATE TOOLS NEEDED TO REMOVE & DISPOSE OF POISON OAK. MORE INFORMATION ABOUT THE REMOVAL PROCESS IS ON SECTION 22.1.4.2. OF
WWW.PARKS.CA.GOV/PAGES/1324/FILES/CHAPTER%2022%20-%20WORK%20SITE%20SAFETY.FINAL.12.27.18.PDF T.B.R.

DEMOLITION LEGEND

EXISTING TREE TO REMAIN, PROTECT IN PLACE

TREE SIZE (DBH) AND TYPE

EXISTING TREE TO BE REMOVED

TEMPORARY CONSTRUCTION FENCING,

PER SPECS
TREE PROTECTION FENCING, PER SPECS.

REFER TO TREE PROTECTION NOTES FOR
ADDITIONAL REQUIREMENTS.

1. DAMAGES: THE CONTRACTOR SHALL BE HELD LIABLE FOR ANY DAMAGE TO EXISTING TREES, I.E. TRUNK WOUNDS, BROKEN LIMBS, POURING OF ANY DELETERIOUS MATERIALS, OR CONCRETE WASHOUT UNDER THE DRIPLINE OF THE TREES. DAMAGES WILL BE ASSESSED USING THE "GUIDE TO PLANT APPRAISAL" 9TH EDITION, PUBLISHED BY THE INTERNATIONAL SOCIETY OF ARBORICULTURE. AN APPRAISAL REPORT PREPARED BY THE CONTRACTOR'S CERTIFIED ARBORIST SHALL BE SUBMITTED TO THE CITY ARBORIST FOR REVIEW AND APPROVAL.

2. PRIOR TO THE START OF DEMOLITION TREE PROTECTION FENCING PER SPECS SHALL BE INSTALLED A MINIMUM OF ONE FOOT BEYOND THE CANOPY DRIP LINE OF ANY TREE TO REMAIN WHICH WILL BE AFFECTED BY THE PROPOSED WORK. DIMENSIONS WILL BE CONTINGENT UPON THE TREE SIZE AND SPECIES. THE FENCING SHALL REMAIN IN PLACE FOR THE DURATION OF THE PROJECT EXCEPT FOR THE TEMPORARY REMOVAL REQUIRED FOR GRADING OR DEMOLITION OPERATIONS. THIS TREE

PROTECTION ZONE (TPZ) SHALL BE POSTED WITH WARNING SIGNS IN ENGLISH AND SPANISH TO ALERT EQUIPMENT OPERATORS AND CONTRACTORS ABOUT THE PROTECTED STATUS OF THE TPZ. SIGNS SHOULD CONTAIN CONTACT INFORMATION FOR THE CONTRACTOR.

3. THE CONTRACTOR SHALL HIRE AN INTERNATIONAL SOCIETY OF ARBORICULTURE (ISA) CERTIFIED ARBORIST (PROJECT

ARBORIST) AND ALL ARBORICULTRAL AND RELATED SOIL WORK SHALL BE PERFORMED UNDER THE SUPERVISION OF PROJECT ARBORIST OR CITY ENGINEER OR DESIGNATED REPRESENTATIVE. PROJECT ARBORIST SHALL MAKE INSPECTIONS DURING EXCAVATION FOR TEMPORARY CONSTRUCTION ENTRANCE AND AGGREGATE BASE SURFACING. CONTINUED DISCUSSION

AND COORDINATION BETWEEN PROJECT ARBORIST, OWNERS, CONTRACTORS, AND CITY ENGINEER SHALL OCCUR TO FURTHER DEFINE THESE GUIDELINES BASED ON THE ACTUAL WORK PLANNED IN THE VICINITY OF TREES TO REMAIN. ALL

SPECIFIED ARBORICULTURAL WORK SHALL BE COMPLETED PRIOR TO SITE GRADING (HAND TRENCHING, PRUNING, FENCING, ETC.)

4. NO EXCAVATION, GRADE CHANGES, STORAGE OF MATERIALS, OR PARKING OF VEHICLES SHALL BE ALLOWED WITHIN THE TREE PROTECTION FENCE. BORING OR HAND EXCAVATION FOR AGGREGATE BASE, UTILITIES SHALL BE DONE BY THE CONTRACTOR WITHIN THE TREE DRIPLINE AND SHALL BE UNDER THE SUPERVISION OF THE PROJECT ARBORIST. SEE SPECIFICATIONS FOR ADDITIONAL ROOTZONE PROTECTION REQUIREMENTS.

5. IF DURING EXCAVATION A TREE ROOT GREATER THAN 2 INCHES IN DIAMETER IS ENCOUNTERED, THEN ALL WORK SHALL STOP IMMEDIATELY UNTIL PROJECT ARBORIST CAN PERFORM AN ON-SITE INSPECTION. ALL ROOTS SHALL BE CUT CLEAN AND THE TREE AFFECTED MAY REQUIRE SUPPLEMENTAL IRRIGATION/FERTILIZATION AND PRUNING AS A RESULT OF ROOT PRUNING.

6. TREE REMOVAL: REMOVAL OR PRUNING OF ANY PROTECTED NATIVE TREE, SIGNIFICANT TREE OR TREE WITHIN THE PUBLIC

RIGHT-OF-WAY REQUIRES A PERMIT FROM THE CITY OF NAPA PARKS AND RECREATION SERVICES DEPARTMENT UNLESS IT IS APPROVED VIA AUTHORIZED SIGNATURE ON THE DEVELOPMENT PLANS. TREES REMOVED SHALL COMPLETELY REMOVED AND CUT TO GRADE. TREES TO BE REMOVED SHALL BE POSTED 3 DAYS PRIOR INDICATING THAT IT WILL BE REMOVED AND THE REMOVAL HAS BEEN APPROVED AS PART OF AN APPROVED DEVELOPMENT PROJECT.

7. EXPOSED ROOTS: EXPOSED ROOTS SHALL BE COVERED AT THE END OF THE WORK DAY BY USING TECHNIQUES SUCH AS COVERING THE ROOTS WITH SOIL, MULCH, OR WET BURLAP.

TREE PROTECTION NOTES

8. HAND DIG AROUND EXISTING TREES.

T.R.

RIP RAP DRAINAGE AREA

POISON OAK REMOVAL, SEE
NOTE 3

TO BE REMOVED

TO REMAIN, PROTECT

IN PLACE

DEMOLITION NOTES
EXISTING CONCRETE CURB T.B.R. APPROX. 21 LF.

SAWCUT AT NEAREST JOINT. LIMITS OF REMOVAL PER

COORDINATES PROVIDED ON SITE CONSTRUCTION
PLAN.

EXISTING CONCRETE CURB T.R.

EXISTING STORM DRAIN INLET T.R.

EXISTING WATER METER AND BOX T.R.

EXISTING SWALE, REMOVE, STOCKPILE, AND
REMEDIATE RIP RAP.

REMOVAL AND REPLACE EXISTING RIP RAP

REMOVAL AND REPLACE EXISTING FENCE

REMOVE STOCKPILE AND RELOCATED RIP RAP
EXISTING SUBSURFACE DRAIN APPROX. LOCATION.

EXISTING 4" PERFORATED CORRUGATED DRAINAGE
PIPE.

EXISTING 4" SOLID CORRUGATED HDPE PIPE.

MONITORING WELL T.R.
1 2
3 4
5 6
7 8
9 10
11 12
NONE
3 NONE T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_DM.dwg NO.

REVISIONS
DESCRIPTION ELEV.

DESCRIPTION:

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION
DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
DATE:

CAD FILE:

DRAWING NO.

SHEET NO. OF
VERT.

RH/OP 10/14/24
5/22/24
5/22/24
OCTOBER 14, 2024

DEMOLITION PLAN

2.0 A17058_DM.dwg

DEMOLITION KEYNOTES
,JX, r;I"! ) >--v \X_\c/J'Y-.
1/'-(J).,,.,
\'v If.-~,, ~,_., 1:~ ... ;.,,J(>,1-1
,,.. ,~w -y:J_>-~
)
i
.,
®
+ +
+
+ +
+
+ +
+
±.._±
i
-j_
0 0
I
l
I
l
"--
9,27
107 G~ 107
--.......
--.......
/~·
121
•
4 ~ .,25,60 JP1/J .V/

LIMIT OF WORK
~----=-
0 T"""
0 0000 0000 0 00
,,:;)f.E?
-
r:1: c:,
:-.. .
•
_ ... ·. ii
i;" {'".
. .. -.
..
\:?
;,:,'":.
:,::_:_..
1, ,:,;
;~<!,'
,'"-
,,.
,.
•
w
' 0
c.; 1s '.Sl:: _J
a_
-~1 I I w
_J
<(
(
I i I
,5)
O -ruz.1.23
'U
-
~-.1
•
lll r!:,IJ,l•f
3:
u.
0 ~II
::::i
IL---____,11 ()
•I
I".'
.,
,11a.41
-)
co
lo
_J
I
1",(.12.3,
12~.o
,128.24
,127,
7,41
126,2
! ..
"' ''' -,\
,127,95_
I
I
,126,64
I
,.
127,99
•
\
\
~
~ 3,32
\e
---
,132.21
--
,130.49
•
,<126,31
•
,126.20
,125,1~
129.75
D piPE ~ON WELL
,128,85
,127,11
,126,50
,126,36
,126,22
.126,40
~126,75
,126,38
,121.06
,129,33
,129,44
.1~8.83
,127,39
,127, 16
,127,55
,12s.12
,126179
,127,
,128,16
26,96
,121,71
128.03
,128,39
,121,16
,127,46
,128,28
,128,
,126.83
,127,68
>
,127,29
,121.47
,128,62
~:
._/ &'
((
j t;f
<:,
, ..
..,.,..,
:Q,. - =- •+,Jg,18 ------
)/l:fOM ::lO .Ltwn
l'--
lo
_J
129.41•
,128,
.129.75.
,128,49
,129.26
,1zg~
,~ ~\·
'
.
c.o
lo
_J
\
,128,86
-,,.129.2 1
'-.
•
131, 14'=',
£~ 107
IB 'lfl!!P LS6732
•
@
,132,1i3
,132.39
,131.39
,130,14
,,fJ.9,79
•
,1 29.07
129,42'
,128,91
,z9.38'
,128,89 • gi ,iu·
,128.72
,128, 14
,121.65
'°"
'O
,(~/)~ -- -=:.
•
<(
w
a:
<(
0 z •
<(
_J •

0....
::::) •
•
,127,13
,126,46 121,03
126,96 ,126,45
121.01
'·
'•,
'•,
,12~e
~ --..x
•
- .-, (l) ,J. L
1) =:'i
-· +-'
' ) ( I
. '::_ QJ
;_) -+--'
~·c
j) u
J) L
<(
(I)
J) Cl
--::JO
m ::'le
F"\, k'.
•"=='
;:: t:)
t;;

1.n 2'.'· ,;1 'i'TI tJ;
'a~ :t.1( ['"{;
'!,, J ,J ( I
:-: --:::-' t
T""'. 1/J C m \._) ,. u--- ,.,,,'dl-Y - I.. ) r~ -~ a~ - '•;:'.' ;y • L
8 (__)
( _ _) _J
.... ,, u; ,-----:v,,-----"
,:, o cr:

CJ F
_,.,::::-,- 'f --:;-.. ::::_,
/ \°cc.: ____ :,- :~.
/4(,~/ ~~'\ F {;/:' - V,:'.,\-_ ,'/ .If •<;_8 \'?,\\ ,:/~,i?- " '1 ,:_.) '1 '1:;::/ ...., "2 -,, "'- '1 c__, I~ ;g c,: t c ' c, 11 / Vl _ "° , c; / 1, 11~,\~, &:i _fpe; /Sc.,,1'.,,'
\\ L~ \;/f, /c :;;::,/1
\/~ .!:.\·/_; \\ ;ft , c:;,•-,, \~"~\';,/·---- --- -~~( .;f' '~';(}fJ 11 _ _ :-:- ·,_·:-:._---:___ - __ _
•

1.90 172,89 •
175,52
.,
•
•
•
•
•
•
•
•
•
LO
lo
_J
)/l:fOM ::lO llW/1,
n
I
,:1(
00 lLll
Cl
r·--
-
d
z
t1
(i)
'~•
Fl,
:'S
..::r
u
b
C\I
b
T"""
--
o I
I
I
;z;
== ;;
Q
rlJ.
... ...
..
...
~-
I I I

ATTACHMENT 4

EROSION CONTROL LEGEND

STABILIZED CONSTRUCTION ENTRANCE

CONSTRUCTION STAGING AND MATERIAL

STORAGE AREA

FIBER ROLL BARRIER

STORM DRAIN INLET PROTECTION

METAL FENCING PER SITE CONSTRUCTION PLANS

SILT FENCE
EROSION CONTROL BLANKET PER EC-7 OF

CASQA CONSTRUCTION BMP HANDBOOK
2 L3.2
1 L3.2
4 L3.2
3 L3.2

1. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

PROJECT DESCRIPTION AND PURPOSE:

TOTAL DISTURBED AREA: 1.60 ACRES
TOTAL PROJECT SIZE: 1.66 ACRES
NEAREST RECEIVING WATER:

PLANNED PROJECT START DATE:

PLANNED GRADING COMPLETION DATE:

PLANNED PROJECT COMPLETION DATE:

I CERTIFY THAT THE INFORMATION PROVIDED IN THE EROSION AND SEDIMENT CONTROL PLAN IS, TO THE BEST OF MY KNOWLEDGE AND BELIEF, TRUE, ACCURATE, AND COMPLETE AND THAT IT WILL IMPLEMENT THROUGHOUT THE PROJECT. I

FURTHER CERTIFY THAT I WILL NOTIFY THE CITY OF NAPA CA AND SUBMIT REVISED INFORMATION IF ANY IF THE INFORMATION OR CONDITION DOCUMENTED IN THIS EROSION AND SEDIMENT CONTROL PLAN CHANGE. I UNDERSTAND THERE ARE

SIGNIFICANT PENALTIES FOR SUBMITTING FALSE INFORMATION OR FOR NOT IMPLEMENTING THE EROSION AND SEDIMENT CONTROL; PLAN PER NMC 8.36.00 STORMWATER RUNOFF POLLUTION CONTROL. I WILL RETAIN A COPY IF THE EROSION AND SEDIMENT CONTROL PLAN AT THE PROJECT SITE.

SIGNATURE:

PRINT/TYPE NAME:

TITLE:

DATE:

PROJECT INFORMATION

APPLICANT CERTIFICATION

EROSION AND SEDIMENT CONTROL NOTES WPB
SD

SD WPB SL SLPGE
W
W
PGE
PG&E
SL
3 L3.2

CONCRETE WASHOUT AREA SHALL
BE PER BMP MANUAL WM-8.

INSTALL FIBER ROLL

BARRIERS ON SLOPE PER

APPROXIMATE LIMIT
OF LANDFILL CAP.

APPROXIMATE LIMIT
OF LANDFILL CAP.

APPROXIMATE LIMIT
OF LANDFILL CAP.

LAYOUT APPROX. DISTANCES

BASED ON FIBER ROLE DETAIL

EXISTING FENCE

EXISTING FENCE

APPROXIMATE LIMIT
OF LANDFILL CAP.

NONE
4 NONE
FOR EROSION CONTROL DETAILS SEE SHEET 3.1 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_EC.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

EROSION CONTROL PLAN

3.0 A17058_EC.dwg
NORTH
0 20 feet
1" = 20'
40 ... , ... .. ... • .,. .. · .. . . .

LOT 8
LOT 7
LOT 6
LOT 5
-D---J
/;
I
I
f,
I
I
I
I
,&:
[ ...... . ,

PA CALE
•
•
•
L CE
!.
~
"'
....
...
,,.-----------!.
~
...

UPLAND AREA •
•
• • •
•
• •
"
• •
•
•
---........
!.
"' ~
ti;
!.

Ii,
....
"'
. '-,,_
·,
!.
"'
"'
~
'·"~
\
\
\
"

UTILITIES DEPARTMENT
I
I
•
•
T"""
T"""
lo
_J
C\J
T"""
I0
_J
M
T"""
lo
_J
1111111111
0 -Q---
--0----
M
8 88
8 11-; 11 ~,O T1ibui.my Po'nil D11iv,e
Gold Rlve" 9'5570

THE FOLLOWING NOTES REPRESENT MINIMUM ENFORCEMENT NOTES. THE CONTRACTOR IS RESPONSIBLE TO ENFORCE THE BEST MANAGEMENT PRACTICES AT THE SITE ALONG WITH OTHER SOURCES.

1. IN CASE OF EMERGENCY, CALL RESPONSIBLE PERSON AT (24 –HOUR TELEPHONE. PLEASE FILL IN NAME & NUMBER)

2. A STAND-BY CREW FOR EMERGENCY WORK SHALL BE AVAILABLE AT ALL TIMES. NECESSARY MATERIALS SHALL BE AVAILABLE

ON-SITE AND STOCKPILED AT CONVENIENT LOCATIONS TO FACILITATE RAPID CONSTRUCTION OF EMERGENCY DEVICES WHEN RAIN IS IMMINENT.

3. EROSION CONTROL DEVICES SHOWN ON THIS PLAN MAY BE REMOVED WHEN APPPROVED BY THE BUILDING OFFICIAL IF THE GRADING OPERATION HAS PROGRESSED TO THE POINT WHERE THEY ARE NO LONGER REQUIRED.

4. GRADED AREAS ADJACENT TO FILL SLOPES LOCATED AT THE SITE PERIMETER MUST DRAIN AWAY FROM THE TOP OF SLOPE AT THE CONCLUSION OF EACH WORKING DAY. ALL LOOSE SOILS AND DEBRIS THAT MAY CREATE A POTENTIAL HAZARD TO OFF-SITE PROPERTY SHALL BE STABILIZED OR REMOVED FROM THE SITE ON A DAILY BASIS.

5. ALL SILT AND DEBRIS SHALL BE REMOVED FROM ALL DEVICES WITHIN 24 HOURS AFTER EACH RAINSTORM AND BE DISPOSED OF PROPERLY.

6. A GUARD SHALL BE POSTED ON THE SITE WHENEVER THE DEPTH OF WATER IN ANY DEVICES EXCEEDS TWO FEET. THE DEVICE SHALL BE DRAINED OR PUMPED WITHIN 24 HOURS AFTER EACH RAINSTORM. PUMPING AND DRAINING OF ALL BASINS AND DRAINAGE DEVICES MUST COMPLY WITH THE APPROPRIATE BMP FOR DEWATERING OPERATIONS.

7. THE PLACEMENT OF ADDITIONAL DEVICES TO REDUCE EROSION DAMAGE AND CONTAIN POLLUTANTS WITHIN THE SITE IS LEFT TO THE DISCRETION OF THE FIELD ENGINEER. ADDITIONAL DEVICES AS NEEDED SHALL BE INSTALLED TO RETAIN SEDIMENTS AND OTHER POLLUTANTS ON SITE.

8. DESILTING BASINS MAY NOT BE REMOVED OR MADE INOPERABLE BETWEEN NOVEMBER 1 AND APRIL 15 OF THE FOLLOWING YEAR WITHOUT THE APPROVAL OF THE CITY.

9. STORMWATER POLLUTION AND EROSION CONTROL DEVICES ARE TO BE MODIFIED, AS NEEDED, AS THE PROJECT PROGRESSES, THE DESIGN AND PLACEMENT OF THESE DEVICES IS THE RESPONSIBILTY OF THE QUALIFIED SWPPP DEVELOPER/FIELD ENGINEER.

PLANS REPRESENTING CHANGES MUST BE SUBMITTED FOR APPROVAL.

10. EVERY EFFORT SHOULD BE MADE TO ELIMINATE THE DISCHARGE OF NONSTORMWATER FROM THE PROJECT SITE AT ALL TIMES.

11. ERODED SEDIMENTS AND OTHER POLLUTANTS MUST BE RETAINED ON SITE AND MAY NOT BE TRANSPORTED FROM THE SITE VIA SHEET-FLOW, SWALES, AREA DRAINS, NATURAL DRAINAGE COURSES, OR WIND.

12. STOCKPILES OF EARTH AND OTHER CONSTRUCTION-RELATED MATERIALS MUST BE PROTECTED FROM BEING TRANSPORTED FROM THE SITE BY THE FORCES OF WIND OR WATER.

13. CONTRACTOR TO FOLLOW CITY OF NAPA STANDARDS AND SPECIFICATIONS 1.10.02 WATER POLLUTION CONTROL.

14. FUELS, OILS, SOLVENTS, AND OTHER TOXIC MATERIALS MUST BE STORED IN ACCORDANCE WITH THEIR LISTING AND ARE NOT TO CONTAMINATE THE SOIL AND SURFACE WATERS. ALL APPROVED STORAGE CONTAINERS ARE TO BE PROTECTED FROM THE WEATHER. SPILLS MUST BE CLEANED UP IMMEDIATELY AND DISPOSED OF IN A PROPER MANNER. SPILLS MAY NOT BE WASHED INTO THE DRAINAGE SYSTEM.

15. EXCESS OR WASTE CONCRETE MAY NOT BE WASHED INTO THE PUBLIC RIGHT-OF- WAY OR ANY OTHER DRAINAGE SYSTEM.

PROVISIONS SHALL BE MADE TO RETAIN CONCRETE WASTES ON SITE UNTIL THEY CAN BE DISPOSED OF AS SOLID WASTE.

16. DEVELOPERS/CONTRACTORS/ QUALIFIED SWPPP DEVELOPERS (QSD)/ QUALIFIED SWPPP PRACTITIONER (QSP), ARE RESONSIBLE TO INSPECT ALL EROSION CONTROL DEVICES AND BMPS ARE INSTALLED AND FUNCTIONING PROPERLY, IF THERE IS A 50% CHANCE OF 0.25 INCHES OR GREATER OF PREDICTED PRECIPITATION, AND AFTER ACTUAL PRECIPITATION. A CONSTRUCTION

SITE INSPECTION CHECKLIST AND INSPECTION LOG SHALL BE MAINTAINED AT THE PROJECT SITE AT ALL TIMES AND AVAILABLE FOR REVIEW BY THE BUILDING OFFICIAL (SELF-INSPECTION CHECK LIST AND INSPECTION LOGS PER STATE SWPPP REQUIREMENTS).

INCIDENTS OF NON- COMPLIANCE MUST BE REPORTED TO THE FIELD ENGINEER.

17. TRASH AND CONSTRUCTION-RELATED SOLID WASTES MUST BE DEPOSITED INTO A COVERED RECEPTACLE TO PREVENT CONTAMINATION OF RAINWATER AND DISPERSAL BY WIND.

18. SEDIMENTS AND OTHER MATERIALS MAY NOT BE TRACKED FROM THE SITE BY VEHICLE TRAFFIC. THE CONSTRUCTION ENTRANCE ROADWAYS MUST BE STABILIZED SO AS TO INHIBIT SEDIMENTS FROM BEING DEPOSITED INTO THE PUBLIC RIGHT-OF- WAY.

ACCIDENTAL DEPOSITIONS MUST BE SWEPT UP IMMEDIATELY AND MAY NOT BE WASHED DOWN BY RAIN OR OTHER MEANS.

19. ANY SLOPES WITH DISTURBED SOILS OR DENUDED OF VEGETATION MUST BE STABILIZED SO AS TO INHIBIT EROSION BY WIND AND WATER.

20. PROVIDE STORMWATER CONVEYANCE SYSTEM STENCILING AND SIGNAGE FOR BOTH PRIVATE DEVELOPMENT AND PUBLIC RIGHT OR WAY.

20.1. PROVIDE CONCRETE STAMPING, OR EQUIVALENT, OF ALL STORMWATER CONVEYANCE SYSTEM INLETS AND CATCH BASINS WITHIN THE PROJECT AREA WITH PROHIBITIVE LANGAUAGE (E.G., “NO DUMPING DRAINS TO NAPA RIVER”).

20.2. POST SIGNS AND PROHIBITIVE LANGUAGE AND/OR GRAPHICAL ICONS, WHICH PROHIBIT ILLEGAL DUMPING AT PUBLIC

ACCESS POINTS ALONG CHANNELS AND CREEKS WITHIN THE PROJECT AREA, TRAILHEADS, PARKS, BUILDING ENTRANCES AND BIORTENTION FACILITIES. THE FOLLOWING BMPS FROM THE “CALIFORNIA STORM WATER BMP CONSTRUCTION HANDBOOK” – NOVEMBER 2009, OR LATEST EDITION, OR EQUAL, MUST BE IMPLEMENTED FOR ALL CONSTRUCTION ACTIVITIES AS APPLICABLE. ADDITIONAL MEASURES MAY BE REQUIRED IF DEEMED APPROPRIATE BY CITY INSPECTORS. ONLY INCLUDE BMP’S REFERENCED PROJECT ON THE SITE MAP.

EROSION AND SEDIMENT CONTROL/SWPPP PLAN NOTES
NONE
5 NONE
FOR EROSION CONTROL DETAILS SEE SHEET 3.2 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_EC.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

EROSION CONTROL PLAN

3.1 A17058_EC.dwg

PROJECT BEST

MANAGEMENT PRACTICES
(BMP)

BMP MAINTENANCE SCHEDULE BMP INSTALLATION SCHEDULE

WET/DRY

SEASONS BMP INSPECTION FREQUENCY MAINTENANCE CLEARING GRADING UTILITIES PAVING POSTCONSTRUCTION
BOTH

STABILIZED

CONSTRUCTION

ENTRNACE

DAILY REPLACE GRAVEL AS NECESSARY, REMOVE EXCESSIVE SOIL ACCUMULATION, SWEEP ADJACENT STREETS DAILY. X X X X

BOTH FIBER ROLL PRIOR TO AND AFTER RAIN EVENT, AND

DURING EXTENDED RAIN EVENTS
REPAIR OR REPLACE SPLIT, TORN, UNRAVELING OR SLUMPING ROLLS. IN ACTIVE CONSTRUCTION,

RETURN ROLLS THAT HAVE BEEN MOVED TO PROPER PLACES AT THE END OF EACH WORKDAY DURING THE WET SEASON.

X X X

BOTH STRAW MULCH AFTER EACH RAIN EVENT REAPPLY MULCH AND TACKIFIER AS NECESSARY, SLOPES MAINTAINED AND REPAIRED IMMEDIATELY AFTER RAIN EVENT. X X X X X
BOTH

INLET SEDIMENT

CONTROL

WEEKLY, AND PRIOR TO AND AFTER RAIN
EVENTS

MATERIAL SPILLING FROM SEDIMENT CONTROL DEVICES SHALL BE CLEANED UP AND REPAIRED OR REPLACE IMMEDIATELY. DISPOSE OF SEDIMENT PROPERLY. X X X X

BOTH CONCRETE
WASHOUTS DAILY MINIMUM OF 4' OF FREEBOARD, HARDENED CONCRTE SHALL BE REMOVED AND DISPOSED OF PROPERLY. WASHOUT SHALL BE CLEANED WHEN THE WASTE VOLUME REACHES 75% CAPACTY. X BOTH

STREET SWEEPING
AND

VACCUMING

WEEKLY AND PRIOR TO AND AFTER RAIN
EVENTS. WHEN IN USE DAILY
REMOVE SEDIMENT AT LEAST DAILY. ADJUST BROOMS FREQUENTLY. DISPOSE OF SWEEPER WASTES AT APPROVED DUMP SITES. X X X X

WET SEDIMENT TRAP WEEKLY AND PRIOR TO AND AFTER RAIN
EVENTS
SEDIMENT SHALL BE REMOVED FROM THE BOTTOM OF THE TRAP WHEN 300MM (1 FOOT) DEEP OR LESS. X X X
11:; 11 ~,O T1ibui.,111y Pn'nil D11iv,1e
Gold Rlve" 9'5570

UTILITIES DEPARTMENT

NONE
6 NONE
1 3.2

STABILIZED CONSTRUCTION ENTRANCE

PLAN/SECTION
NOTE:

1. STABILIZED CONSTRUCTION SITE

ACCESS SHALL BE CONSTRUCTED
OF 3" TO 6" WASHED,

WELL-GRADED GRAVEL OR
CRUSHED ROCK. MATERIAL SHALL

BE PLACED TO A MINIMUM
THICKNESS OF 6 INCHES.

2. LENGTH OF ENTRANCE SHALL BE A
MINIMUM OF 50 FT. WIDTH SHALL BE
A MIN. OF 15 FT OR GREATER IF

NECESSARY TO COVER ALL
VEHICULAR INGRESS AND EGRESS.

PROVIDE AMPLE TURNING RADII.

3. THE ENTRANCE SHALL BE KEPT IN

GOOD CONDITION BY

OCCASIONAL TOP DRESSING WITH
MATERIAL AS SPECIFIED IN NOTE 1.

4. ACCESS SHALL BE INSPECTED

WEEKLY DURING PERIODS OF

HEAVY USAGE, MONTHLY DURING

NORMAL USAGE, AND AFTER EACH

RAINFALL, WITH MAINTENANCE
PROVIDED AS NECESSARY.

PERIODIC TOP DRESSING SHALL BE
DONE AS NEEDED.

CONSTRUCTION SITE RIGHT OF WAY

EXISTING
GROUND
50 FT MINIMUM

SECTION A-A
A A

DIRECTION
OF TRAVEL 15'-0" MIN.

PLAN VIEW

GEOTEXTILE

MATERIAL

STABILIZED CONSTRUCTION

SITE ACCESS
2 3.2

FIBER ROLL BARRIER

SECTION
4 3.2

STORM DRAIN INLET PROTECTION

PLAN/SECTION

FIBER ROLL
3 4
" X 3
4 " X 24" STAKES

SIDEWALK OR OTHER

IMPROVEMENT WHERE
IT OCCURS.

NOTES:

1. FIBER ROLL BARRIER SHALL BE CONSTRUCTED

LONG ENOUGH TO EXTEND ACROSS THE

EXPECTED FLOW PATH AND AS APPROVED
BY THE CITY REPRESENTATIVE.

2. FIBER ROLL (8" TO 12" DIAMETER) SHALL BE

PLACED INTO THE KEY TRENCH AND STAKES
ON BOTH SIDES OF THE ROLL WITHIN 5 FEET
OF EACH END AND THEN EVERY 3' TO 4'.

STAKES OF SHALL BE DRIVEN IN ON
ALTERNATING SIDES OF THE ROLL. ADJACENT
ROLLS SHALL TIGHTLY ABUT.

3. CLEAR SUBGRADE TO REMOVE ALL LOCAL

DEVIATIONS AND LARGE STONES OR DEBRIS

THAT WILL INHIBIT CONTACT OF THE FIBER
ROLL WITH THE SUBGRADE.

4. PRIOR TO ROLL INSTALLATION, CONSTRUCT A
CONCAVE TRENCH 2 INCHES DEEP ALONG
THE PROPOSED INSTALLATION ROUTE. FIBER

ROLL SHALL BE INSTALLED WHERE INDICATED
ON PLANS. THE BOTTOM EDGE OF THE FIBER

ROLL SHALL EXTEND TO AND ACROSS THE
BOTTOM OF THE TRENCH. THE TRENCH SHALL
BE BACKFILLED TO 4 INCHES ABOVE

GROUND AND COMPACTED TO BURY AND
SECURE THE BOTTOM OF THE FIBER ROLL.

FLOW
2" MIN.
4" MAX.
6" MIN. TYP. 12" MIN.
17058_FilterRollBarrier.dwg T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_EC.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

EROSION CONTROL DETAILS
3 3.2

FIBER ROLL BARRIER
SECTION 12" MIN.

INSTALL A FIBER

ROLL NEAR

TRANSITION TO

STEEPER SLOPE
SLOPE 4:1 OR FLATTER, SPACE
AT 20'-0" MAX SLOPE BETWEEN
4:1 AND 2:1, SPACE AT 15'
MAX SLOPE 2:1 OR STEEPER,
SPACE AT 10' MAX.
3/4" X 3/4" X 24"
STAKES

FIBER ROLL
FLOW
6" MIN.

TYP.
2" MIN.
4" MAX.

ON SLOPES 3:1 OR

STEEPER, INSTALL

JUTE NETTING PER
BMP MANUAL EC-7
NOTES:

1. REFER TO NOTES ON DETAIL 2 OF THIS SHEET FOR ADDITIONAL REQUIREMENTS.

2. INSTALL FIBER ROLL ALONG LEVEL CONTOUR.

3. TURN ENDS OF FIBER ROLL UP SLOPE 4'-0" MIN. TO PREVENT RUNOFF FROM GOING AROUND ROLL.

FOR EROSION CONTROL PLAN SEE SHEET 3.0

3.2 A17058_EC.dwg
N.T.S. N.T.S. N.T.S.

ROCK FILTER (USE IF FLOW

IS CONCENTRATED)

CONCENTRATED
FLOW

SHEET FLOW

SHEET FLOW
XX
00 SILT FENCE PER

GEOTEXTILE

BLANKET

DRAIN INLET

EDGE OF

SEDIMENT TRAP

SHEET FLOW PLAN
A

STABILIZE AREA AND

GRADE UNIFORMLY

AROUND PERIMETER
1:1 SLOPE
NOTE:

REMOVE SEDIMENT

BEFORE REACHING
ONE-THIRD FULL.

DRAIN INLET

SILT FENCE

SECTION A-A

GEOTEXTILE

BLANKET
-j
,--._ '('-'-'_:_ ... _;\ ''-=-)( __ / ~-.()/ ·,.,;~ J.-'._ 1/,(- "•\,:(f \ _ _,'(\ /, _;I~ 1 , __ ,, --,J, ,, -·,xc .... ,•,-.)..___, \..,, /=-<'-. . /\l \_A. __ J1_:: _)--'!.¢ C) r L
I j j ~~ -
L l l _J
1/
i..----
A
7 4'

UTILITIES DEPARTMENT
-
z )( _<(
LL
11-; 11 ~,O T11'bui.my Pn'nic D11iv,1e
Gold Rlve" 9'5570
Ctl,IJl, ?rcie::lt N,r1 17G58A

WPB
SD

SD WPB SL SLPGE
W
W
PGE
PG&E
SL

APPROXIMATE LIMIT OF

LANDFILL CAP

PROTECT IN PLACE

PROTECT IN PLACE

PROTECT IN PLACE,

ENCASE MONITOR
WELL PER DETAIL 8/6.0

REMOVE EXISTING RIP RAP AND STOCKPILE

ONSITE FOR REUSE
2 4.1
4 4.1
5 4.1
6 4.1
8 4.1
3 4.1
1 4.2
4 4.2
3 4.2
7 4.1
1 4.1
2 4.2
5 4.2
6 4.2
REMOVAL 4122 SF,
153 CY
REMOVAL 213 SF

2.8 CY
REMOVAL 1,527 SF, 20 CY

DEBRIS AREA
6,895 SF
REMOVAL 2,923 SF
108 CY
REMOVAL 137 SF

1.7 CY
REMOVAL 2316 SF,
57 CY
REMOVAL 101 SF, 1.25 CY
REMOVAL 253 SF, 8.6 CY
REMOVAL 87 SF,

1.1 CY
REMOVAL 982 SF, 37 CY
REMOVAL 1,090 SF, 33.7 CY
REMOVAL 154 SF
2 CY
REMOVAL 563 SF

17.4 CY
REMOVAL 746 SF
26 CY
REMOVAL 549 SF

20.3 CY
REMOVAL 2,236 SF
14 CY
REMOVAL 1,360 SF
42 CY
REMOVAL 327 SF

11.2 CY
HORIZONTAL AND VERTICAL CONTROL: MAG

NAIL SET IN CURB ON PASCALE PLACE AT
NORTHING 1870374.71 AND EASTING 6484988.00
AT ELEVATION 104.76

HORIZONTAL AND VERTICAL
CONTROL: MAG NAIL SET IN
ROCK AT NORTHING 1870304.73
AND EASTING 6485232.28 AT
ELEVATION 138.89
CONTROL POINT #2

HORIZONTAL AND VERTICAL
CONTROL: 3/4" IRON PIPE

WITH RED CONTROL CAP AT
NORTHING 1870491.19 AND
EASTING 6485175.66 AT
ELEVATION 136.65
EXISTING 4" PVC DRAIN LINE ENCASED
IN CONCRETE, PROTECT IN PLACE.

EXISTING 4" PVC PERFORATED DRAIN LINE IN POLYETHYLENE LINED

GRAVEL TRENCH AT EDGE OF LANDFILL CAP, PROTECT IN PLACE

FL MATCH (E)
105.25
TC 105.70
BVC 105.65 TC MATCH (E)
107.98
131
132
133
134
135
136
137
REMOVAL 79 SF,
1 CY
REMOVAL 1126 SF,
13 CY
REMOVAL 458 SF,
32 CY
REMOVAL 1190 SF

7.3 CY
7 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_WE.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

WASTE EXCAVATION PLAN

4.0 A17058_WE.dwg
0 20 feet
1" = 20'
40 NORTH
SOIL WITH WASTE REMOVAL (<10")
SOIL WITH WASTE REMOVAL (10"-20")
SOIL WITH WASTE REMOVAL (21"-30")
RELOCATED SOIL WITH WASTE (TOTAL STOCKPILE DEBRIS = 495 CY)

SECTION CUT
EXISTING CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED CONTOUR FOR SOIL WITH WASTE MOUND: 1'-0" INTERVAL TYP.

PROPOSED SPOT ELEVATION (EXISTING SPOT ELEVATIONS ARE SCREENED ON PLAN)

DIRECTION AND PERCENT SLOPE OF SHEET DRAINAGE

GRADE BREAK

FLUSH CONDITION

CONTROL POINT

HIGH POINT

TOP OF CURB

BOTTOM OF CURB

TOP OF WALL

BOTTOM OF WALL

TOP OF RAMP

BOTTOM OF RAMP

RIM ELEVATION OF DRAIN INLET, SEE WALL AND DRAINAGE PLAN VERTICAL CURVE PER CHP HIGHWAY DESIGN MANUAL SECTION 200-24

BEGINNING OF VERTICAL CURVE

END OF VERTICAL CURVE

GRADE BREAK
X%
GB

1. GRADING: CONTRACTOR SHALL PERFORM ALL EARTHWORK AND GRADING PER GEOTECHNICAL ENGINEER'S RECOMMENDATIONS.

2. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

3. MAXIMUM EXCAVATION REQUIRED. AMOUNT OF EXCAVATION MAY BE REDUCED IF BEDROCK IS ENCOUNTERED AT SHALLOW DEPTHS.

HP
TC
BC
TW
BW
TR
BR
RIM
VC
BVC
EVC
GB

WASTE EXCAVATION NOTES

21.25 22
X
XX
22 CONTROL POINT #1 PA

LIMIT OF
C)
J
LOT 8
•~J '< <- (,,'\ , '
(_i ,-- ' '-.. ,--, \_,J (_----:_1 ' ',_,
'.~ C j l I ',\,) , r·, - -- .-
\ (.~ . , r"'i '-:~-.- r..__, (_J O ,; .. c:-, z __ '~ (';_ \ , - 'v \, I ') ') ..._ti'j"'o,\._.,, ,,,,_ I ( -\I •1 Cl ,, '-· '--- C ~ -'"__,-
') ,,$ ' -, - 1..__, (] _ _.,_--- 0,
--1.._ _ _'.:-: - (.__, _Q_f" ~ ,~
"":-'
LOT 7
IJ.
,·
, ~; Ci I' \
J c"'- -..: I \
- \J ,l -.J 'li.._1-,
>---
\
LOT 6
~
'::. ....
~
~
-
"'
~
N
....

LOT 5
,;, 11 -\... - - '-,
!I") -
...r-.
~ ':l ~
' "' N
tii• :-'
.- '- N UPLAND "' :,..
"' ..
~ • ~
•
• • •
• • •
• •
-D---'
~
N
"' 'e;
~
N
"'
"' ~
N
:-'
"' ~ N
~
°' "'
~
~
N
'--' N
• •
;._,
AREA •
•
•
----
-------
•
•
.
• I . "l . ' ..
. .
·1· ) ' ..
..
.
• 1·. ' . . .
: ;;...:. ~ :-;-: . { ....... . M < M M

M ' X M
M • X M
. .
·1· . . . . ~ ' ...
.. ,. • • • . , . . . . :;; .. • l : KN
'f.i. K K N
-... l et,M N N
"" . • M ,r-t N
I
•

UTILITIES DEPARTMENT
I
I
T""""
T""""
lo
_J
C\J
T""""
lo
_J
C')
T""""
lo
_J

WASTE EXCAVATION LEGEND
r
)
11711 ~,O T1ibui.my Po'nil
Gold Rlve" 9'5570

0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50' 55' 60' 65' 70' 75' 80' 85' 90' 95' 100' 105'
110'
115'
120'
125'
130'
135'
0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50' 55' 60' 65' 70' 75' 80' 85' 90' 95' 100' 105'
110'
115'
120'
125'
130'
135'
0' 5' 10' 15' 20' 25' 30'
120'
130'
140'
125'
135'
0' 5' 10' 15' 20'
120'
130'
140'
125'
135'
130'
140'
125'
135'
0' 5' 10' 15' 20' 25' 30'
115'
125'
135'
120'
130'
0' 5' 10' 15'
110'
120'
130'
115'
125'
EX. CURB
EX. ROAD
(PASCALE PLACE)
EX. CURB
EX. ROAD
(PASCALE PLACE)
LOT 7
LOT 12
35' 40'
25' 30'
LOT 9
LOT 9
LOT 9
LOT 10
0' 5' 10' 15' 20' 25' 30'
145'
150'
105'
45'
4'-0"
130'
140'
135'
145'
125'
150'
155'
120'
115'
-5'
-5'
-5' -20' -15' -10' -5' 20'
-10' -5'
-5'
-10' -5'
-230' -225' -220' -215' -210' -205' -200' -195' -190' -185' -180' -175' -170' -165' -160' -155' -150' -145' -140' -135' -130' -125' -120' -115' -110' -105' -100' -95' -85'-90' -80' -75' -65'-70' -60' -55' -45'-50' -40' -35' -25'-30' -20' -15' -10' -5' 0' 5' -10'

PROPERTY LINE
EX. GRADE
EX. BEDROCK

PROPERTY LINE
EX. GRADE
EX. BEDROCK

PROPERTY LINE
EX. GRADE

APPROXIMATE LIMIT

OF LANDFILL CAP
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (24")
EX. GRADE

REMOVE EXISTING SOIL

WITH WASTE
EX. GALVANIZED STEEL FENCE,
TEMPORARILY REMOVE.

EX. GALVANIZED STEEL FENCE

PROPERTY LINE
EX. FENCE
EX. GRADE

APPROXIMATE LIMIT OF

LANDFILL CAP
EX. TOP SOIL
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION
FILL (18" MIN.)

PROPERTY LINE
EX. GRADE
EX. TOP SOIL
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION
FILL (18" MIN.)

PROPERTY LINE

APPROXIMATE LIMIT

OF LANDFILL CAP

FINISHED GRADE

APPROXIMATE LIMIT OF LANDFILL CAP

PROPERTY LINE
EX. BEDROCK

EXISTING TREE, HAND DIG

FOR MAINTENANCE

VEHICLE ACCESS
EX. BEDROCK

SOIL WITH WASTE

SOIL WITH WASTE

SOIL WITH
WASTE

SOIL WITH WASTE

SOIL WITH WASTE

PROPERTY LINE

REMOVE EXISTING SOIL WITH
WASTE

APPROXIMATE LIMIT OF

LANDFILL CAP
EX. PROPERTY LINE
EX. BED ROCK
EX. BED ROCK
EX. BED ROCK
EX. BOULDER
EX. BED ROCK
EX. BED ROCK
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. FOUNDATION FILL
(18" MIN.)

REMOVE EXISTING SOIL WITH
WASTE

REMOVE EXISTING SOIL

WITH WASTE

REMOVE EXISTING SOIL

WITH WASTE

REMOVE EXISTING SOIL WITH

REMOVE EXISTING SOIL WITH WASTE
WASTE
EX. GEOCOMPOSITE DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. GRADE
EX. TOP SOIL
EX. WASTE
EX. FOUNDATION FILL (18" MIN.)

SOIL WITH WASTE FILL,

SEE PLAN FOR DEPTH
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (24")
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (24")

APPROXIMATE LIMIT

OF LANDFILL CAP

APPROXIMATE LIMIT

OF LANDFILL CAP
EX. TOP SOIL

UPDATED
EX. GRADE
8 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_WE.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

WASTE EXCAVATION SECTIONS

4.1 A17058_WE.dwg
r
I ~
I //
:4 ..,.7 \I , _: 0,. If
\ . -·--
. . . . hr"::' .. -11"(.:-
~ \ .
,, - ' --• = • > . . " ' / -::_::~;>-- ... ,..., _,//
l l . A II
" I
@SECTION1 4.1 SECTiall VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' r
r ~
I ... - . . . . --. . / ' ----. -,,,,,, ____ ., -
_) --- - --
./ ----- 11··· I I l ,I ...
' .• . \l
~ ··)[ Ja-11 .
------::::;,- J_ }k-., ~ \\ 71 ::/ , I ..
@SECTION4 4.1 SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' SECTION 7
SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' -
\ . - -· . .. . I .. . ?"1' Ii . ----, _,_ . - --- ___ .,.,- " -- - \ \\ . - . --. --'I-. II -~~::___,\C A •. - l
' " A ,_ /1. " "-- - "-,-
\
. - - .--L I - -
- ..
. -. .. ,,-·' --- tr J: . . ,/'
. . . - - -- - - /
. -------- --1r· - 1"( \ A l 'N
- " . . --,.,:- ----c
- - (( \ II N
~
'
\__
- ___ .:-'Su -c_iu.
ll re, "
" • \\
I
-. . - - -- .. T
(
- " ('( \~
I
I
I
I
I
:n;.i:;:::1 , -= V
tp, V
"
" ~
-~
--+---1--
@SECTION2 4.1 SECTlON vEHhCAL SCALE: f'-5' HORIZONTAL SCALE: f'-5' ~
11; Jf
((
~
·-.J'~;
LU SECTION 5 ~ SECTlON vEHhCAL SCALE: f'-5' HORIZONTAL SCALE: f'-5'

UTILITIES DEPARTMENT
'!:> \.. ' i,
._ .....:....\. L.

SECTION 3
!
SECTION VERTICAL SCALE: f'-5'
___ 0-
HORIZONTAL SCALE: f'-S'
@SECTIONS
[C SECTION VERTICAL SCALE: f'-5' HORIZONTAL SCALE: f'-S' @ SECTIONS
1 SECTION VERTICAL SCALE: 1'-10' HORIZONTAL SCALE: 1"-10' 11711 ~,O T1ibui.my Po'nil D11iv,e
Gold Rlve" 9'5570
Ctl,IJl, ?rcje::lt No. 17G58A

120'
130'
140'
125'
135'
0' 5' 10' 15' 20' 25' 30'
120'
130'
140'
125'
135'
35' 40' 45'
0' 5' 10' 15' 20' 25' 30'
110'
120'
130'
115'
125'
35' 40' 45'
LOT 5
LOT 6 LOT 6
0' 5' 10' 15' 20' 25' 30'
120'
130'
125'
135'
35' 40' 45' 50'
115'
55'
LOT 5
0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50'
130'
125'
135'
LOT 6 145'
140'
-15' -10' -5' -5'
-10' -5' -10' -5'
-10' -5' 0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50'
120'
130'
140'
125'
135'
LOT 9
-20' -15' -10' -5' 0' 5' 10' 15' 20'
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE

MEMBRANE
EX. FOUNDATION FILL (18" MIN.)
EX. FENCE

PROPERTY LINE
EX. GRADE

APPROXIMATE LIMIT OF LANDFILL CAP

PROPERTY LINE
EX. GRADE
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE NET
& POLYETHYLENE MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. GRADE

APPROXIMATE LIMIT OF LANDFILL CAP
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. FENCE

PROPERTY LINE
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. FOUNDATION FILL (18" MIN.)
EX. FENCE

PROPERTY LINE
EX. GRADE

APPROXIMATE LIMIT OF

LANDFILL CAP

EXISTING TREE,

HAND DIG
APPROXIMATE LOCATION OF EX. DECK
EX.

WALL

SOIL WITH WASTE

SOIL WITH WASTE

SOIL WITH WASTE
EX. FENCE
EX. GRADE
EX. DECK IN APPROXIMATE LOCATION

PROPERTY LINE

SOIL WITH WASTE
EX. BED ROCK

REMOVE AND REPLACE EXISTING RIP RAP
EX. TREE
EX. BED ROCK
EX. SHRUB
EX. FENCE
EX. BED ROCK

REMOVE EXISTING

SOIL WASTE

REMOVE EXISTING SOIL
WITH WASTE EX. BED ROCK

REMOVE EXISTING SOIL

WITH WASTE

REMOVE EXISTING SOIL

WITH WASTE
EX. BED ROCK

REMOVE EXISTING SOIL WITH WASTE

PROPERTY LINE

SOIL WITH WASTE
EX. BED ROCK
EX. FENCE
EX. GRADE NEW LAYER OF

SOIL WITH WASTE

REMOVE EXISTING SOIL

WITH WASTE
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE NET
& POLYETHYLENE MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. NEW LAYER OF SOIL WITH WASTE

APPROXIMATE LIMIT OF

LANDFILL CAP
9 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_WE.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

WASTE EXCAVATION SECTIONS

4.2 A17058_WE.dwg
SECTION 1 SECTION 2
SECT10N ve«ICAL SCALE: f'-5' HOFIZONTAL SCALE: 1"-5' SECTION VERTICAL SCALE: 1"-5' HORIZONTAL SCALE: f'-5' I '
SECTION 3 SECTION 4
SECT10N vamcAL SCALE: f'-5' HOFIZONTAL SCALE: 1"-5' SECTION VERTICAL SCALE: 1"-5' HORIZONTAL SCALE: f'-5' ~,_lj,___________,_
SECTION 5 11711 ~,O T1ibui.my Po'nil D11iv,e
SECTION v&H'ICAL SCALE: f'-5' HORIZONTAL SCALE: 1"-5' Gold Rlve" 9'5570 Ctl,IJl, ?rcje::lt N,r1 17G58A

UTILITIES DEPARTMENT

SOIL COVER MATERIAL

SECTION CUT

SOIL REMEDIATION PILE CONTOUR
EXISTING CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED SPOT ELEVATION (EXISTING SPOT ELEVATIONS ARE SCREENED ON PLAN)

DIRECTION AND PERCENT SLOPE OF SHEET DRAINAGE
SWALE WITH MIN. 2% SLOPE

GRADE BREAK

FLUSH CONDITION

CONTROL POINT

HIGH POINT

TOP OF CURB

BOTTOM OF CURB

TOP OF WALL

BOTTOM OF WALL

TOP OF RAMP

BOTTOM OF RAMP

RIM ELEVATION OF DRAIN INLET, SEE WALL AND DRAINAGE PLAN VERTICAL CURVE PER CHP HIGHWAY DESIGN MANUAL SECTION 200-24

BEGINNING OF VERTICAL CURVE

END OF VERTICAL CURVE

GRADE BREAK
X%
GB

GRADING AND DRAINAGE NOTES

1. GRADING AND DRAINAGE: ALL PROPOSED PAVING, CURBS, WALLS, AND PLANTING AREAS SHALL SMOOTHLY CONFORM TO EXISTING ADJACENT FEATURES TO REMAIN. PROVIDE POSITIVE DRAINAGE ON ALL PAVING AND THROUGHOUT ALL PLANTING AREAS.

2. SOIL STOCKPILE: STRIP AND STOCKPILE EXISTING 6" LAYER OF SOIL FROM AREAS DISTURBED DURING GRADING OR EXCAVATION.

3. GRADING: CONTRACTOR SHALL PERFORM ALL EARTHWORK AND GRADING PER GEOTECHNICAL ENGINEER'S RECOMMENDATIONS.

4. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

HP
TC
BC
TW
BW
TR
BR
RIM
VC
BVC
EVC
GB
X
XX
XXX
XX
XX.XX WPB
SD

SD WPB SL PGE
W
W
PGE
PG&E
SL
L=128.47 , R=225.00 Δ=32° 42' 5 4" N46° 47' 37"E 106.48' N46° 47' 37"E 106.48'
N50° 43' 20"W

79.84'
L=18.12, R=32.00 Δ=32°26'37" N83° 10' 01"W

16.20'
N83° 10' 01"W
132.99' N73° 05' 03"W 67.99'
N16° 55' 11"E 58.30'
N16° 55' 11"E 327.88'
N68° 18' 22"W

24.07'
N70° 12' 09"W

18.42'
N65° 49' 13"W

54.38'
N36° 31' 56"W

25.19'
N12° 57' 00"W

29.06'
N41° 22' 49"W

25.60'
N62° 33' 25"W

22.11'
N73° 13' 30"E 20.26'
N67° 08' 28"W

71.16'
N22° 05' 10"W

59.78' N75° 55' 17"W 64.57'
N14° 04' 43"E

49.82'
N14° 04' 43"E
115.50'
N14° 04' 43"E
141.38'
N14° 04' 43"E
128.14' N75° 55' 17"W 16.01'
N14° 04' 43"E

80.00'
N14° 04' 43"E

29.69' N75° 55' 17"W 61.80'
N11° 23' 13"E 2.48'
N41° 16' 44"E 31.83' N74° 27' 57"W 42.29'
N37° 05' 54"E 42.14'
N11° 52' 43"E

35.16'
N48° 46' 49"E 77.69'
N66° 25' 41"W
120.04'
131
132
133
134
135
136
137
HP 131.80
2 5.1
5 5.1
6 5.1
8 5.1
3 5.1
1 5.2
4 5.2
3 5.2
2 5.2
5 5.2
7 5.1
4 5.1
1 5.1
HP 131.65
6 5.2
130
131
132
134
136
137
138
139
141
142
140
129
128
128
128
128
127
126
125
128
129
130
131
131
130
129
128
127
126
125
124
123
122
121
120
118
119
116
117
113
114
115
111
112
109
110
107
108
129
129
129
131
132
133
134
135
136
137
138
HP 138.25
HP 129.25
HP 127.8
135
133
10 5.0
A17058_GD.dwg T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_GD.dwg NO.

REVISIONS
DESCRIPTION ELEV.

DESCRIPTION:

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION
DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
DATE:

CAD FILE:

DRAWING NO.

SHEET NO. OF
VERT.

RH/OP 10/14/24
5/22/24
5/22/24
OCTOBER 14, 2024

FINAL GRADING PLAN
0 feet 20
1" = 20'
40 NORTH C z w C, w ...J w C, <C z
-
<C
a:

C C
z <C
IC X X z X X X )
-
C )( X X l K K X
)( X X )
X X X l

C, )( X X )
L~ ·, , • .,,___ -•0 ~ '' "' /!1C, '·'·' I
I
'
I
I
I;
I I
/
I
I
I; / ,
) •,JC,
e,_,,[l
11i//116

1.;1,(, ,J
I
-(J
.. I

I I I I I I I
II I I
"••j
L-ico
lo
_J
1 T ! I C!-$-
I
I
I
I
1·~_J/;--'N~'
116,99
,117.79
---...._
107 G~ 107 8~ 107
---...._ •"""'' IP wfY!.P L56732
---
.,,___ * !.c' - • ,119,27
,121.41
~i .__ r _J~1~f~ORK g_.._ /} ' ,,,1.,26 / / .,
--
'
\
·1" ', I LS't~1 .._., ____ _;.

I\. ,11J,95,
. \
,12t M
•,
\
.r-\ "11-1
r.,..,A> \ "n-[ c>, - ", •·;'A 'tl f/".,-, .,i::.1 \ , ' - \,
-·• !
\
"
•
--
,.126.31
' ~-----
- r--:-.
--
,126,20
,127,68
,127,29
,121.47
\ - __, " ',-_ 1 '~ --. --- •e_~1_s1-c- 1'3~ ~11~ _If '\> ,128,26 . , .. \ "I'(_
_/.'-.
,128.32 f-._ ..
,-----\
'\~;\\ ,128
---
",,
r---
lo
_J
!I:

I
-- -.1\
,:<, ?:i-- ----
L @\ -\< \
..:::.::_-1:-,
--~"---, __
)/ijQM :JO .LIVV/1
129,4
!!l ,,,
X .,/;_)X X ")! )( X X X X X X X X X X
-"~1!'~ L'.1- ,._ X X X ::c==-
K K K

X X X X X X X X X X )( X

X X X X X X IC X X X IC X
-
X K K
)( X
:,._
X X X
~
·-xxxxx ;::.,. xx
X X X X ~ •\_ 'IC X )(XXX
X X X X X X X ;.. ~:::,..,X )( )( X X
XX XX XX XX XX XX X:::,._~ X XX XX XX~ XX X X X X X X ~ XX )( x , x K _"____ -- X X X X X\ S K
xxxxxxxxxxxxxx xxx l x
X X X X X X X X X X X X X X X X X x~ x
)( X )"\·
K K K \ .K K

X X X X
K ~ K
------- ---
)( X X X X X X X X

X X X X X X
X X X X X X X , ·- ·- •. X
)()()C)(
'
__

X X X X
··,._X X
)( )( )( )(//
' X X X /

X X / '
' - -I!=
,1z
x.16
, ,,21.55
~-- 126,50
/// __ ,,,'
"JC.1 'lr,;r,9
' '
' . '"'
. ":>''
co
lo
_J
127,
,127.71
131,14
K X

X X X X
K K K -~
)( )( )(~)( )(
xxx~x
X X )I
X X X :
:_ : \ \: : X \ K X IX
1 )(~)()( '\)()()(~ . \ >I\_ )( X X ) )( X X
\ \ )(
K •'•,•
1•
)()( ' )(")(
X \\X X
K K K
',\< K !' \<
'. K ' ' \'
,1~8.831 '--
~-- ' •
,12.B,7;,
,128, 16
,129,2'
11"
--------
,129,07 \
1 . , ... 184 2~ ·
)J
,128,9
129_;s•
,128,89 .9~ ,iu·
,128.72
,12f 4...
--
;,I '--
,121.65
LC')
lo
_J
•
<(
w
a:
<(
0 z • <(
_J
a..
::>
,,. I '1,2 .,:_ 6,4-"6 . I!>-/;-:- <:._j,· ''Htt!N---: Ji/ C/J,-J ..)L_, J ,126-
~
.
,:t1.ll1
\
>-..___
.......................
'-
. ..___,
' ,1126:20
•
•
•
•
•
• ,·, (l)
,J_ L
1) =:'i
--· +-'
~-) (_)
G) ;_) -+-'
::)
, r)
,J. u
J) L
<l.
(I)
J) Cl
--::JO
( )
1·/) 77 , . \.__,- \~)
L
8 (_)
( _ _) _J
m ::'le
F"\, k'.
•"=='
t:) b rr<>.,
u__ (,,;)
t,; ,J

1.n 2'.'· ,;1 ,;sq tJ;
:..::,
....L': t
= 'IJ • '. I}= \'Saa 00
CJ·°& c:
ft, u; .-----:v,,-----"
,:, o cr:

CJ 1---
_,,.::,·:-,- ,,,- --:;-.. ::::_,
/ \°cc.: ____ :,, :~.
/4(,~/ ~~'\ F {;/:' - V,:\ \-_ ,'/ .If •<;_8 \'°?,\\ ,:/~.i?- " '1 ,:_.) '1 '1:;::/ ...., "2 -,, "'- '1 c...., I~ ;g c,: t c ' c, 11 / Vl _ "° , c; / 1, 11~,\~, &:i _fpe; /~,1'.,,'
\\ L~ \;/f-, /c :;;::,/1
\/~ .!:.\'1/ \\ ;ft , c:;,•._, \~'-~\';,/·---- --- -~~( .;f' '"::;;:,~~X:; 11 __ :-:- ·--·:-:.."':..._-_-- ,:1(
00 lLll
Cl
r•-.
-
d
z
t1
(i)
'~•
Fl.
:'S
..::r
u
@
•
•
11 .. • r" ~s1J 11
,175,52
"
• •
•
•
®
•
•
•
•
•
•11
_ ;i e>,1.-r '.J/ ,.
,131 ,73
i;R£E 18"
F REE 18"
a
I
a
;z;
== <
Q
rlJ.
... ...
..
...
~-
I I I

ATTACHMENT 4
0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50' 55' 60' 65' 70' 75' 80' 85' 90' 95' 100' 105'
110'
115'
120'
125'
130'
135'
0' 5' 10' 15' 20' 25' 30' 35' 40' 45' 50' 55' 60' 65' 70' 75' 80' 85' 90' 95' 100' 105'
110'
115'
120'
125'
130'
135'
EX. CURB
EX. ROAD
(PASCALE PLACE)
EX. CURB
EX. ROAD
(PASCALE PLACE)
LOT 12
105'
130'
140'
135'
145'
125'
150'
155'
120'
115'
-5'
-5'
-230' -225' -220' -215' -210' -205' -200' -195' -190' -185' -180' -175' -170' -165' -160' -155' -150' -145' -140' -135' -130' -125' -120' -115' -110' -105' -100' -95' -85'-90' -80' -75' -65'-70' -60' -55' -45'-50' -40' -35' -25'-30' -20' -15' -10' -5' 0' 5' LOT 9
140'
135'
130'
125'
120'
0' 5' 10' 15' 20' 25' 30'
LOT 9
140'
135'
130'
125'
120'
-5' 0' 5' 10' 15' 20' 25' 30'
LOT 9
130'
125'
120'
115'
110'
0' 5' 10' 15' 20' 25' 30' 0' 5' 10' 15' 20'
115'
125'
135'
120'
130'
LOT 7
35' 40' 45'
2% MIN SLOPE
3 1
-5' -20' -15' -10' -5'
-10' -5'
0' 5' 10' 15' 25'20' 30'
125'
130'
135'
140'
145'
145'
LOT 10
-10' -5'
-10'

PROPOSED GRADE

PROPERTY LINE

REMOVE EXISTING SOIL WITH
WASTE. FILL WITH CLEAN SOIL

TO PROVIDE POSITIVE
DRAINAGE.

EX. BEDROCK

PROPERTY LINE

PROPERTY LINE

PROPERTY LINE
REMOVE EXISTING SOIL WITH WASTE.

FILL WITH CLEAN SOIL TO PROVIDE
EX. FENCE POSITIVE DRAINAGE
EX. BOULDER
EX. GALVANIZED

STEEL FENCE

APPROXIMATE LIMIT OF

LANDFILL CAP APPROXIMATE LIMIT OF

LANDFILL CAP

APPROXIMATE LIMIT OF

LANDFILL CAP

PROPOSED GRADE
EX. BED ROCK
EX. TREE
EX. FENCE

SOIL WITH WASTE
EX. GRADE

PROPOSED GRADE
EX. BED ROCK
EX. PROPERTY LINE

REMOVE EXISTING SOIL WITH
WASTE. FILL WITH CLEAN SOIL

TO PROVIDE POSITIVE

DRAINAGE

PROPOSED GRADE
EX. GRADE
EX. PROPERTY
LINE

SOIL WITH WASTE
EX. BED ROCK
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (24")
EX. GRADE
EX. TOP SOIL
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION
FILL (18" MIN.)
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION
FILL (18" MIN.)
EX. BED ROCK
EX. GRADE

FINISHED GRADE
EX. BED ROCK
EX. GRADE

FINISHED GRADE

APPROXIMATE LIMIT OF

LANDFILL CAP

PROPERTY LINE
EX. GRADE
EX. BEDROCK
EX. GEOCOMPOSITE DRAINAGE NET
& POLYETHYLENE MEMBRANE
EX. TOP SOIL
EX. WASTE
EX. FOUNDATION FILL (18" MIN.)

SOIL WITH WASTE FILL,

SEE PLAN FOR DEPTH
2'-0" MIN. OF SOIL CAP
REMOVE EXISTING SOIL WITH WASTE. FILL

WITH CLEAN SOIL TO PROVIDE POSITIVE

DRAINAGE
EX. PROPERTY LINE

APPROXIMATE LIMIT OF

LANDFILL CAP

SOIL WITH DEBRIS
EX. GRADE
EX. BED ROCK
PROP. GRADE
REMOVE EXISTING SOIL WITH WASTE. FILL WITH

CLEAN SOIL TO PROVIDE POSITIVE DRAINAGE

FINISHED GRADE
EX. GRADE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION FILL
(18" MIN.)

REMOVE EXISTING SOIL WITH
WASTE. FILL WITH CLEAN SOIL

TO PROVIDE POSITIVE

DRAINAGE
SWALE
11 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_GD.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

5.1 GRADING SECTIONS
A17058_GD.dwg
I
\ -1 - -- - __ .;c-;- , -• c,1 u--=. =n_i:;=1 1;;. - -- I ~ I --- -- II )I N If V -- - - I ,, ' \ \\ • ' \\ ,, // - - -- -- --- --- L r,, - 'i. II - )I " ' 's ~
-- )\ II --- "
iifzl
,,. \I ,._ /1. " ) , A l ~
I - ~ 1r -
- ,, I),,
\ -- - - - - -- -
" - - - -
l ~
T ,, X\ - J, -- ,, ' -- -c:.-- V " \ - -:,? Ii l l "---. ~ I
@SECTION1 5.1 SECTION vEROOAL SCALE: 1"-10' HORIZCWTAL SCALE: 1"-10' ~ SECTION2 ~ SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: f-10' @SECTION3

5.1 SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' \ I - 371;:- - - - . T ---- - - -- - - - - ( - - -- - - - ' I ---- ---_.,,- _fi, _l - -
{ " ~\ - - - l IN
- - " ('( - -
i \ J - - - --- -
;If __ ---- - - (( N i II (( - - I - -- - ' --
-~-- - " I I l ,I \1 ' r - ' - - ~
---- \l ,_
~¾...;
~ \ - -.::;;;;:. -- ,Y'
,,;;/,
' ' '" ~-
I I II "" '-
@SECTION4 5.1 SECTION VERTICAL SCALE: 1"-10' HORIZCWT AL SCALE: 1"-10' @SECTIONS L5.1 SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: f-10' @SECTIONS 5.1 SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' ·4-t--r",-,°'==; ' \
~ I
\ \_ - '\---,--f-_/-1 LJ
\ \
@SECTIONS

5.1 SECTION VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' @SECTION7 5.1 SECTION VERTICAL SCALE: 1"-10' HORIZCWT AL SCALE: 1"-10' 11711 ~,O T1ibui_my Po'nil D11iv,e Gold Rlve" 9'5570
Ctl,IJl, ?rcje::lt N-rl 17G58A

UTILITIES DEPARTMENT

110'
115'
120'
130'
125'
LOT 5
0' 5' 10' 15' 25'20' 30' 35' 45'40'
LOT 6 140'
135'
130'
125'
120'
0' 5' 10' 15' 20' 25' 30' 35' 40' 45'
0' 5' 10' 15' 20' 25' 30' 35' 50'45'40'
125'
130'
135'
140'
145' LOT 6
0' 5' 10' 15' 20' 30'25' 40'35' 50'45'
120'
125'
130'
135'
140' LOT 6
0' 5' 10' 15' 20' 30'25' 40'35' 50'45' 55'
115'
120'
125'
130'
135' LOT 5
2'-0" FROM

PROPERTY LINE
-15' -10' -5' -5'
-10' -5'
-10' -5'
-10' -5'
140'
135'
130'
125'
120'
-20' -15' -10' -5' 0' 5' 10' 15' 20'
LOT 9
EX. FENCE

PROPOSED GRADE

PROPOSED WALL & FENCE
SWALE

PROPERTY LINE

PROPERTY LINE

GEOCOMPOSITE

DRAINAGE NET

APPROXIMATE LIMIT OF

LANDFILL CAP

APPROXIMATE LIMIT OF

LANDFILL CAP

APPROXIMATE LOCATION

OF EXISTING DECK

SOIL WITH WASTE
EX. BED ROCK
EX. PROPERTY LINE
EX. WALL
EX. TREE (HAND DIG TO

EXCAVATE DEBRIS)
EX. FENCE

PROPOSED GRADE
EX. GRADE
EX. SHRUB

SOIL WITH WASTE
REMOVE EXISTING SOIL WITH WASTE. FILL WITH

CLEAN SOIL TO PROVIDE POSITIVE DRAINAGE
EX. BEDROCK
EX. GRADE
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE

MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. FOUNDATION FILL
(18" MIN.)
EX. FENCE EX. GRADE
EX. DECK IN APPROXIMATE LOCATION

PROPERTY LINE

SOIL WITH WASTE
REMOVE EXISTING SOIL WITH WASTE. FILL

WITH CLEAN SOIL TO PROVIDE POSITIVE
DRAINAGE.
1'-0" MIN. SOIL LAYER FILL SOIL TO

PROVIDE POSITIVE DRAINAGE

REMOVE EXISTING SOIL WITH
WASTE. FILL WITH CLEAN SOIL TO

PROVIDE POSITIVE DRAINAGE
REMOVE EXISTING SOIL WITH WASTE. FILL WITH

CLEAN SOIL TO PROVIDE POSITIVE DRAINAGE
1'-0" MIN. SOIL LAYER, FILL

SOIL TO PROVIDE POSITIVE

DRAINAGE
1'-0" MIN. SOIL LAYER, FILL

SOIL TO PROVIDE POSITIVE

DRAINAGE

REMOVE AND REPLACE EXISTING
RIPRAP WITH NORMAL 3" CRUSHED
ROCK, 1' THICK AND EXTENDING 6"

ABOVE THE TOP PF THE DRAINAGE PIPE
NORMAL 12" RIP

RAP MINIMUM
2-FT THICKNESS

APPROXIMATE LIMIT OF

PROPERTY LINE LANDFILL CAP
EX. 4-INCH SOLID

CORRUGATED HDPE PIPE
EX. 4-INCH PERFORATED CORRUGATED

DRAINAGE PIPE LOCATED AT END OF

GEOCOMPOSITE DRAINAGE NET
EX. FENCE
1'-0" MIN. SOIL LAYER, FILL SOIL

TO PROVIDE POSITIVE

DRAINAGE
1'-0" MIN. SOIL LAYER, FILL

SOIL TO PROVIDE POSITIVE

DRAINAGE
EX. BEDROCK

PROPERTY LINE
EX. BED ROCK
EX. FENCE EX. GRADE
EX. TOP SOIL
EX. WASTE
EX. GEOCOMPOSITE DRAINAGE NET
& POLYETHYLENE MEMBRANE
EX. FOUNDATION
FILL (18" MIN.)
EX. NEW LAYER OF SOIL WITH DEBRIS
REMOVE EXISTING SOIL WITH WASTE TO BEDROCK. FILL

WITH CLEAN SOIL TO PROVIDE POSITIVE DRAINAGE

APPROXIMATE LIMIT OF

LANDFILL CAP
2'-0" FROM

PROPERTY LINE
2% MIN
2% MIN
2% MIN
2% MIN
12 T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_GD.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

5.2 GRADING SECTIONS
A17058_GD.dwg
@SECTION1 5.2 SECTlON vB1flCAL SCALE: 1"-10' HOIIZONTAL SCALE: 1"-10' @SECTION2

5.2 SECT'DI VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' LLi SECTION 3 \_[,V SECTlON vB1TICAL SCALE: 1"-10' HOIIZONTAL SCALE: 1"-10' @SECTION4

5.2 SECT'DI VERTICAL SCALE: 1"-10' HORIZONTAL SCALE: 1"-10' \
I ,~~~L--~~-l--- -- - ----,_
LLi SECTION 5 \_[,V SECTlON vB1TICAL SCALE: 1"-10' HOIIZONTAL SCALE: 1"-10' 11711 ~,O T1ibui.my Po'nil D11iv,e
Gold Rlve" 9'5570
Ctl,IJl, ?rcje::lt N,r1 17G58A

UTILITIES DEPARTMENT

W
W
N50° 43' 20"W

79.84'
L=18.12, R=32.00 Δ=32°26'37" N83° 10' 01"W

16.20'
N83° 10' 01"W
132.99' N73° 05' 03"W 67.99'
N16° 55' 11"E 58.30'
N16° 55' 11"E 327.88'
N68° 18' 22"W

24.07'
N70° 12' 09"W

18.42'
N65° 49' 13"W

54.38'
N36° 31' 56"W

25.19'
N12° 57' 00"W

29.06'
N41° 22' 49"W

25.60'
N62° 33' 25"W

22.11'
N73° 13' 30"E 20.26'
N67° 08' 28"W

71.16'
N22° 05' 10"W

59.78'
N14° 04' 43"E

49.82'
N14° 04' 43"E
115.50'
N14° 04' 43"E
141.38'
N41° 16' 44"E N74° 27' 57"W 42.29'
N37° 05' 54"E 42.14'
N11° 52' 43"E

35.16'
N48° 46' 49"E 77.69'
N66° 25' 41"W
120.04'
134
135
136
133
132
131
130
129
128
127
126
125
130
129
128
127
126
125 131
7 5.3
LOT 12
155'
150'
145'
140'
135'
130'
125'
120'
115'
0' 5' -5' -10' -20' -15' -25' -30' -40' -35' -45' -50' -60' -55' -65' -70' -80' -75' -85' -90' -100' -95' -105' -110' -120' -115' -125' -130' -140' -135' -145' -150' -160' -155' -165' -170' -180' -175' -185' -190' -200' -195' -205' -210' -220' -215' -225' -230' 2% MIN SLOPE

APPROXIMATE LIMIT OF

LANDFILL CAP

PROPERTY LINE
EX. GRADE
EX. BEDROCK
EX. GEOCOMPOSITE DRAINAGE NET
& POLYETHYLENE MEMBRANE
EX. TOP SOIL
EX. WASTE
EX. FOUNDATION FILL (18" MIN.)
1'-0" MIN. OF SOIL CAP

SOIL COVER MATERIAL

SECTION CUT

SOIL REMEDIATION PILE CONTOUR
EXISTING CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED SPOT ELEVATION (EXISTING SPOT ELEVATIONS ARE SCREENED ON PLAN)

DIRECTION AND PERCENT SLOPE OF SHEET DRAINAGE
SWALE WITH MIN. 2% SLOPE

GRADE BREAK

FLUSH CONDITION

CONTROL POINT

HIGH POINT

TOP OF CURB

BOTTOM OF CURB

TOP OF WALL

BOTTOM OF WALL

TOP OF RAMP

BOTTOM OF RAMP

RIM ELEVATION OF DRAIN INLET, SEE WALL AND DRAINAGE PLAN VERTICAL CURVE PER CHP HIGHWAY DESIGN MANUAL SECTION 200-24

BEGINNING OF VERTICAL CURVE

END OF VERTICAL CURVE

GRADE BREAK
X%
GB

GRADING AND DRAINAGE NOTES

1. GRADING AND DRAINAGE: ALL PROPOSED PAVING, CURBS, WALLS, AND PLANTING AREAS SHALL SMOOTHLY CONFORM TO EXISTING ADJACENT FEATURES TO REMAIN. PROVIDE POSITIVE DRAINAGE ON ALL PAVING AND THROUGHOUT ALL PLANTING AREAS.

2. SOIL STOCKPILE: STRIP AND STOCKPILE EXISTING 6" LAYER OF SOIL FROM AREAS DISTURBED DURING GRADING OR EXCAVATION.

3. GRADING: CONTRACTOR SHALL PERFORM ALL EARTHWORK AND GRADING PER GEOTECHNICAL ENGINEER'S RECOMMENDATIONS.

4. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

HP
TC
BC
TW
BW
TR
BR
RIM
VC
BVC
EVC
GB
X
XX
XXX
XX
XX.XX
13 5.3
A17058_GD.dwg T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_GD.dwg NO.

REVISIONS
DESCRIPTION ELEV.

DESCRIPTION:

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION
DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
DATE:

CAD FILE:

DRAWING NO.

SHEET NO. OF
VERT.

RH/OP 10/14/24
5/22/24
5/22/24
OCTOBER 14, 2024

GRADING PLAN - ADD ALTERNATE
0 feet 20
1" = 20'
40 NORTH
7 5.3
SECTION 1
SECTION VERTICAL SCALE: 1"=5' HORIZONTAL SCALE: 1"=5'
•
I
• • •

K K X K K X K K X K K X K K X

K X X K X X
I
L+ r+
I
I 107
',"--'I{) ,-,.,
,128.24
.127,•
,41
)
)
J• ) I:~ L::i'f) ,_.1 ,- 1
,,11:1,
\
-----
-----
.125.60
/
}(1. .I
@,
I,..,. [5.,9.:
' ,.
• ,1'126,31
.126,20
!,})[\ _ .127, S[1\ 'J/8";-.;1_'lA"? &
C-••
\
•,
\
121,99
--/
)
\
\
• ' t· \.i;W{,,•a 1) 1 5i-'.: 1,: I- 1,1C.-- 1 - \ __ ,128.28 \
r
1,75

PIPE MON WELL
.125-~
,126,22
,126.38
,126,83
,121.47
.121.68
•1
C!-$-
G~ 107
L\Mli OF woRK
~-~~-'
.121.8~
• 126.50
,126179
.126.75
,129,26
,121.55
,,12B.72
.127,
,12s.16
.121.71
,12s.49
12s.03
,128.39
.129
,' -\~ - - - }l 1-2\t.3~
' ' ' ,,.., ,'!).
\ ,128.32 // \ ~ - //7 = -~ ~'-......
'"~ .. "\
~' \ \ \\\ ,128-
~-
~ "' "'4:.
....
---
--...;;-
"'
• .!:;;-·
~ff,. .. @i • -\< \ ',
.:::;:;;
-
-
..:::_~
-- -- -- --J__~--
)/t:IQM ::IQ llVV/1
t---
lo
_J
1~· .
,,e,·
\ ~•-c - ,7-" <o' - .. ~-
. " ' i"lc 1 •
~ if!'
co
lo
_J
131,14
II
<
£~ 107
f_J!j!!! LS6732
•
..
,132-7-V
•
<(
w
a:
<(
0 z •
<(
.129,07
_J
a_
=>
129.42"
,128.72
.,,.128.1'1
,128.91
,127, 13
,121,65
!,}[;, / ~126.46
~,~, ~/"'"y· •• -', u , t.t::/IN & CAP
'"--
126,9'' .126,45
121.01
' ', ', ',
.12lJ:20
,,,,a..f
6~
-It?/)~-~ --::. __ --;,--.;,
---
LO
lo
_J
@
•

71.90 ,.......-172,89 •
•
,175,52
•
"
•
•
•
•
•
•
•
•
•
•
•
•
•
)lt:,QM ::IQ llVV/1.
•
e;c_-:l;_I [,,/B" ' •
I
I
._e:1+:::c1·;
b.•'1 " - _r·or- i:>:;rJ ::;,/ 5 R<:J-f v
D
I
D
, ,
\ .
•. ·, (l) ,J_ L
1) 1 ~' +,
~-) (_)
•- ])
;_) ~)
m ::'le ::J ·~ j) : .
',"J (._) ,"'"-,,
..,,_ L k
---1" ,,/ d
--- - ;:: t:)
o rr:-,
(I) 0... CJ
:J) () ~· tr?
:7 n ~3 c;;.1( rrr~
\_; - ,1 1 ",· ( ) _ti ¾--?
.----::::---- t I"~
77 IJ) i~ cij \___,-,, ,s~c~ \_) (~J,"5Z·;
'"Lfi.-u;
\. I , r=== V 'r-'
, -; 1'-) ,:, o cr:
',._J ~CJF
_,.,::::-,- 'f --::---::::_,
/ \'cc.: ____ :,, :~.
/4<::~..- ~~'\
F {;/:' - V,:'.,\-_ ,'/ .If •<;_8 \'?,\\ ,:/~,i?- " '1 ,:_.) '1 '1:;::/ ...., "2 -,, "'- '1 c_, I~ ;g c,: t c ' c, 11 / Vl _ "° , c; / 1, 11~,\~, &:i _fpe; /Sc.,,1'.,,'
\\ L~ \;/f, /c :;;::,/1
\/~ .!:.\"// \\ ;ft , c:;,•-,, \~"~\';,/·---- --- -~~( _;f' '::;:_</i:f,J 11 ,,;., "--:::-_-:--:._--:.__ - __::----- ,:1(
00 lLll
CJ
r···
-
d
z
t1
(i)
'~•
Fl.
:-:s
..::r
u
;z;
== ;;
Q
rlJ.
... ...
..
...
~-
I I I

ATTACHMENT 4

GEOTEXTILE FABRIC

RIP RAP, REUSE EXISTING PER FINISH GRADE

DEMOLITION PLANS, OR VIRGIN

MATERIAL TO MATCH EXISTING RIP
RAP ON SITE. LIMITS PER PLANTING
PLAN. 8" MIN. DEPTH.

FINISH GRADE
6 RIP RAP

6.0 1 1/2" = 1'-0" 17058_RipRap.dwg
2 EDGE TREATMENT TYPE 3 - SOIL FILL SWALE

6.0 1/4" = 1'-0" A17058_EdgeTreatmentType2_48.dwg
EXCAVATE 2'-0" MAX OF EX. DEBRIS. FILL

AND GRADE TO DRAIN TO SWALE OR ON
PARK SIDE OF PROPERTY LINE.

PROPERTY LINE
EX. GRADE,
SEE PLANS.

FINISH GRADE
LOT X
SWALE
EX. DEBRIS
4'-0" FROM EXISTING FENCE,
1'-0" MIN. AT TOE OF CUT
1 EDGE TREATMENT TYPE 1 - SOIL FILL GRADE TO DRAIN

6.0 1/4" = 1'-0" A17058_EdgeTreatmentType1_48.dwg
LOT "X"
EX. GRADE, SEE PLANS.

PROPERTY LINE

FINISH GRADE, GRADE

TO DRAIN AWAY FROM
NEIGHBORING LOTS.

SOIL FILL SLOPE AGAINST

PROPERTY LINE
EX. DEBRIS
4'-0" FROM EXISTING FENCE,
1'-0" MIN. AT TOE OF CUT
7 6.0

SWALE SLOPE
MIN: 2%
MAX 33%
SWALE TYP.

SWALE FLOWLINE:

LOCATED PER PLAN
NOTES:

1. SALE TO HAVE MINIMUM 2% LONGITUDINAL SLOPE. CONTRACTOR SHALL ENSURE POSITIVE DRAINAGE TOWARD OUTFALL DESIGNATED ON PLANS.

NOTE:

1. SOIL COVER SHALL BE MIN 5% TO 33% MAX FOR SITE DRAINAGE 4 6.0 1/8" = 1'-0" CLIFF TYP.dwg
CLIFF TYP.

MIN 2' DEPTH
COVER

APPROXIMATE LIMIT

OF LANDFILL CAP

PROPERTY LINE
EX. BEDROCK

1.8'-2' DEPTH OF
DEBRIS

OPTIONAL MORE

DEBRIS LAYER
2' DEPTH OF

SOIL COVER
EX. SOIL
EX. DEBRIS
EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE MEMBRANE
EX. TOP SOIL
3 EDGE TREATMENT TYPE 6 - SOIL FILL OVER PROP. LINE

6.0 1/4" = 1'-0" A17058_EdgeTreatmentType6_48.dwg

GRADE TO
DRAIN
EX. GRADE,
SEE PLANS.

PROPERTY LINE

FINISH GRADE, GRADE

TO DRAIN AWAY FROM
NEIGHBORING LOTS.

LOT "X"

CLEAN SOIL FILL

OVER PROPERTY
LINE

EXISTING DEBRIS

BEDROCK

APPROXIMATE LIMIT

OF LANDFIL CAP
4'-0" FROM EXISTING FENCE,
1'-0" MIN. AT TOE OF CUT
5 EDGE TREATMENT - RIP RAP

6.0 1/4" = 1'-0" A17058_EdgeTreatmentType8_48.dwg

ADDITIONAL
6" RIP RAP
EX. RIP
RAP

FILL SOIL

APPROXIMATE LIMIT

OF LANDFILL CAP

PROPERTY
LINE
EX. FENCE
FINISH
GRADE
EX. BED ROCK EX. DEBRIS
EX. GRADE,
SEE PLANS.

EX. FOUNDATION FILL

GEOCOMPOSITE

DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. TOP SOIL
EX. 4-INCH PERFORATED CORRUGATED

DRAINAGE PIPE LOCATED AT END OF
GEOCOMPOSITE DRAINAGE NET.

EX. 4-INCH SOLID

CORRUGATED

HDPE PIPE
8 MONITOR WELL WITH PRECAST MANHOLE

6.0 1/2" = 1'-0" A17058_EdgeTreatmentType1_48.dwg

ROUND MANHOLE
STEEL VAULT, 24" X 24",
PER SPECS 2'-0"
CONCRETE COLLAR: 9" WIDE BY 6"
DEEP. WITH HORIZONTAL
REINFORCEMENT #3 REBAR CONT.

EXISTING MONITOR WELL AND PAD.

CUT STEEL MONUMENT BELOW GRADE

AND INSTALL PVC CASING IN A FLUSH

TO GRADE WELLBOX WITH CONCRETE
PAD AROUND AT PROP. GRADE

FINISH GRADE
EX. GRADE GRADE
EX. SOIL WITH WASTE
EX. BEDROCK T:\Projects\2017 Projects\17058_HiddenGlenPark\3_ConstructionDocuments\A17058_DT.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

6.0 CONSTRUCTION DETAILS
14 17058_Ph1_DT.dwg
0 J
0 kM~~ I Y{tr7;,,r7~s1fr'2f I 1' •••••• :
~ I I_I __ I_I I I I__J I I_.! ' .
~:%
- -~
' ' -
(
0 0
r
I
r7
0 '':n/-111
~ - I fll= --111-
-:!/1111 11
0 I 1/2" ~ l'-0"

UTILITIES DEPARTMENT
/ / f 'f,,J~
/ .
,>.'=-,.-;t•
~ ",/4 -

1..-:~>?1/~~ , /4 Or
;,<--7 . 1/~ ;; • Jr=,,.,.~'F
. / . /" . /,//~7~¥r~,.,;,\,;s,:" .. ri~ •
~\~~1ffr]f-1~~-\\'{:•.,1._·1\\\\"1~}\ti·.l~~Jl~:'.~~~ A--A~~ :~\~~f~~~~·-.·~\·,'.__;.~~~~--~=-~~-~ --~- ---
0 0
,_a:'=,JLA__
•. ·• . . :, . ',
. .•
- .•· :,, -:~.
rc·itecture
11711 ~,O T1ibui.my Po'nil D11iv,e
Gold Rlve" 9'5570
T 91 6098:'i L:) 56
Ctl,IJl, ?rcje::lt N{l 17G58A

"' 0
"' N
I
0 I "'
C
V
c3
C
V
"O
~
I
I
I
:g
0 I
0 N
z
fN
0 /
00 V
~
0 L
~
V
z
-" L
0 ()._
C
V
c3
C
V
"O
~
I
I
I
V
00 0
L
<
~ L
~
(/]
0 u
I
C
0 0

0. 0
z
U1
0 0
I
0 I
N
/
N
0 N
/
Control Point Table (NAD83 Coordinates)
Point# Raw Description Northing Easting
10 FND_BD IN WELL 1870569.56 6485054.72
I I FND_BD IN WELL 1870245.72 6484973.50
12 FND_BD IN WELL 1870157.47 6485225.09
501 FND_JP LS45l0 1870378.90 6485092.54
508 FND_JP LS45/0 1870359.39 6485/00.44
.!:
0 .c
CJ
1--
I
(j I
__ ___! -{J
LOT 8

76.01'
N75° 55' l 7"W

TOPOGRAPHIC MAP OF HIDDEN GLEN PARK
LOT 11 LOT12
""
(,Q ~ ~~ .., 0
- ...
z
LOT7 "" ~~ ',I")~
LOT6 -
- 0 ..,
z
" w
..____
L55732 pP
L.V I Iv

67.99'
N73"05'03'W
I
I
I
I
fg
0 "'
z
I
I

1. 2.

GRAPHIC SCALE
20 ~ ( IN FEET )
1 inch ~ 20 fl.

LEGEND

MON MONITORING WELL

OS OFFSET

LO LINE ONLY

IP IRON PIPE
NOTES:

Property fines shown here are based on Subdivision Map
fifed in Book 23 Page 82 in the offices of Napa County
Recorder
40 I
Topographic mapping was prepared by photogrammetric
methods, photo date 5- 11-2023, and supplemented by field SUNey.

BASIS OF BEARINGS
NAD83, ZONE IU, EPOCH 2008.00 CALIBRATED ON CITY OF
NAPA POINTS 43, 47, AND 51 AS SHOWN ON RECORD O F
SURVEY BOOK 41 OF SURVEYS AT PAGES 44-47, N.C.R.

THE BEARINGS SHOWN ON THIS EXHIBIT HAVE BEEN ROTATED
TO NAO '83. ROTATE NAD '83 BEARINGS 00° 07' 52"
CLOCKWISE TO OBTAIN RECORD BEARINGS.

THIS MAP WAS PREPARED BY M E OR UNDER MY DIRECTION
SUDHIR K. C HAUDHARY, PLS 8993 DATE
!PROGRESS PRINTI
.,
li
Ii!
~
"'
"'
"' <
:I

DRAWING ID

DESIGN BY

DRAWN BY
MS

CHECKED BY
SC
DATE
AUGUST 1, 2023
SCALE
SHEET
1 OF 1 SHEETS
z
Cl'.'.
0 LJ..
w
~ a.

COUNTY DRAWI NG FILE #
0----------------------------------------------------------------------------------------------------------------------------------------------------- Page 144 of 307 ATTACHMENT 4 Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX D
Geotechnical Laboratory Testing

APPENDIX C
2018 Langan Soil Results

!.
!.
!.
!.

Parcel No. 6
APN: 045411025000
Glory
Court
L6-B-27
L6-B-28
L6-B-26
L6-B-25
L6-B-24
L6-B-22
L6-B-23
L6-B-19
L6-B-20
L6-B-21
L6-B-16
L6-B-17
L6-B-18
L6-B-14
L6-B-15
L6-B-12
L6-B-13
L6-B-10
L6-B-11
L6-B-09
L6-B-07
L6-B-08
L6-B-06
L6-B-04
L6-B-05
L6-B-02
L6-B-03
L6-B-01
139
138
137
135
134
133
132
131
130
129
126
125
124
123
122
1 121
20 11
1 6
15 11
11 3
11 2
11 1
1 0
0 1
9 08
10 1
7 0
1 6
05 103
102
101
118
117
114
13 1
1 30
122
121
120
126
125
136
128
127
119
104
151
141
135
130
129
128
128
126
125
100
128
128
Date 4/23/2019 Project 750649501
\\langan.com\data\OAK\data5\750649501\Project Data\ArcGIS\MXD\Environmental_Figures\Discrete Sampling Figures_April 2019\Lot Specific Report Figures\Lot 6 Haz Waste.mxd User: bsaylor FORMER HIDDEN GLEN LANDFILL INVESTIGATION Napa, California LOT 6 - SITE PLAN

WITH APPROXIMATE SOIL SAMPLE LOCATIONS

EXCEEDING CLASS I NON-RCRA STATE OF

CALIFORNIA HAZARDOUS WASTE CRITERIA

AND RESIDENTIAL ESL FOR LEAD
Figure 2
q Soil Sampling Analytical Results Sample ID L6COMP1 L6B 10 L6B18 L6B19 L6B24 Residential ESLs  Cancer Risk 1 Residential ESLs
 NonCancer
Hazard
1 TTLC2
(mg/kg)
STLC
2 (mg/L)
TCLP
2 (mg/L)
Total Lead (mg/kg) 140 100 300 75 67 82 80 1,000  
STLC (mg/L) 9.0 0.87 0.27 35 0.89    5 
TCLP (mg/L) 0.22 0.021 < 0.5 1.5      5
Legend
!.

Discrete Soil Sample Collected for Four-Point Composite Laboratory Analytical Sample (L6-COMP-1) Approximate Location of Soil BoringAdvanced by Langan, December 2018Approximate Extent of Former Hidden Glenn LandfillLidar Contour - 1ft. IntervalSoil Borings on 15 ft. CentersFormer Hidden Glenn Landfill Buffer - 10 ft.Approximate Location of Soil Sample Exceeding Class I non-RCRA State of California Hazardous Waste CriteriaApproximate Location of Soil SampleExceeding Residential ESL for LeadAssessor's Parcel Boundaries 0 10 20 40
Feet
Notes:1. San Francisco Bay Regional Water Quality Control Board (RWQCB), Direct Exposure Human Health Risk Levels (Table S-1), Soil Residential: Shallow Soil Exposure, Cancer Risk and Non-Cancer Hazard Environmental Screening Levels, dated January 2019. 2. Hazardous Waste Criteria 3. Bold concentration exceeds the lower of the Cancer Risk or Non-Cancer Risk ESLs. 4. Bold Italicized - concentration exceeds hazardous waste criteria. 5. TTLC - California Total Threshold Limit Concentration - State hazardous waste criterion

6. STLC - California Soluble Threshold Limit Concentration 7. TCLP - Federal Toxicity Characteristic Leaching Procedure 8. World aerial imagery basemap is provided through Langan’s Esri ArcGIS software licensing and ArcGIS online. Credits: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, and the GIS User Community. 9. All features shown are approximate. 10. Site boundary provided by the Napa County parcel dataset, 2016. 11. LiDAR survey data for the northern San Francisco Bay, CA provided by National Oceanic and Atmospheric Administration (NOAA) with accuracy of 1 meter, updated 2010. •
CJ
-
IZ2I
ISS]
c::::J
LANliAN

ATTACHMENT 4
!.
!.
!.
!.
!.
!.
!.
!.

Parcel No. 9
APN: 045411021000
Pascale Place L9-B-36 L9-B-37 L9-B-38 L9-B-34 L9-B-35 L9-B-31 L9-B-32 L9-B-33 L9-B-27 L9-B-29
L9-B-30
L9-B-25
L9-B-26
L9-B-28
L9-B-23
L9-B-24
L9-B-21
L9-B-20
L9-B-22 L9-B-18
L9-B-19
L9-B-15
L9-B-17
L9-B-13
L9-B-14
L9-B-16 L9-B-11
L9-B-12
L9-B-10
L9-B-08
L9-B-09
L9-B-06
L9-B-07
L9-B-05
L9-B-03
L9-B-04
L9-B-01
L9-B-02
133
132
131
130
129
128
127
126
122
121
120
119
118
117
116
115
114
111
110
109
108
107
106
105
104
103
102
13 1
7 36
135
143
142
141
140
139
138
128
127
112
111
134
125
124
123
113
144
137
128
123
121
113
106
101
Date 4/30/2019 Project 750649501
0 10 20 40
Feet
\\langan.com\data\OAK\data5\750649501\Project Data\ArcGIS\MXD\Environmental_Figures\Discrete Sampling Figures_April 2019\Lot Specific Report Figures\Lot 9 Haz Waste.mxd User: ogodfrey FORMER HIDDEN GLEN LANDFILL INVESTIGATION Napa, California LOT 9 - SITE PLAN

WITH APPROXIMATE SOIL SAMPLE LOCATIONS

EXCEEDING CLASS I NON-RCRA STATE OF

CALIFORNIA HAZARDOUS WASTE CRITERIA

AND RESIDENTIAL ESL FOR LEAD
Figure 2
q Soil Sampling Analytical Results Sample ID Total Lead (mg/kg) STLC (mg/L) TCLP (mg/L) L9-COMP-1 270 5.5 0.080
L9-B-04 67 1.4 -- L9-B-09 240 5.6 0.20 L9-B-13 2700 4.9 0.13 L9-B-30 200 9.3 0.47 L9-COMP-2 63 3.0 --
L9-B-02 66 1.2 -- L9-B-16 200 2.6 0.032 L9-B-29 100 3.5 0.029 L9-B-35 67 0.19 -- Residential ESLs - Cancer Risk
1 82 -- --
Residential ESLs - Non-Cancer Hazard
1 80 -- --
TTLC2 (mg/kg) 1,000 -- --
STLC2 (mg/L) -- 5 -- TCLP2 (mg/L) -- -- 5
Notes:1. San Francisco Bay Regional Water Quality Control Board (RWQCB), Direct Exposure Human Health Risk Levels (Table S-1), Soil Residential: Shallow Soil Exposure, Cancer Risk and Non-Cancer Hazard Environmental Screening Levels, dated January 2019. 2. Hazardous Waste Criteria 3. Bold concentration exceeds the lower of the Cancer Risk or Non-Cancer Risk ESLs. 4. Bold Italicized - concentration exceeds hazardous waste criteria. 5. TTLC - California Total Threshold Limit Concentration - State hazardous waste criterion

6. STLC - California Soluble Threshold Limit Concentration 7. TCLP - Federal Toxicity Characteristic Leaching Procedure 8. World aerial imagery basemap is provided through Langan’s Esri ArcGIS software licensing and ArcGIS online. Credits: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, and the GIS User Community. 9. All features shown are approximate. 10. Site boundary provided by the Napa County parcel dataset, 2016. 11. LiDAR survey data for the northern San Francisco Bay, CA provided by National Oceanic and Atmospheric Administration (NOAA) with accuracy of 1 meter, updated 2010.

Legend
Approximate Location of Soil BoringAdvanced by Langan, December 2018 !.

Discrete Soil Sample Collected for Four-Point Composite Laboratory Analytical Sample (L9-COMP-1 & L9-COMP-2)Approximate Extent of Former Hidden Glenn LandfillLidar Contour - 1ft. IntervalSoil Borings on 15 ft. CentersFormer Hidden Glenn Landfill Buffer - 10 ft.Approximate Location of Soil Sample Exceeding Class I non-RCRA State of California Hazardous Waste Criteriaand Residential ESL for LeadApproximate Location of Soil SampleExceeding Residential ESL for LeadAssessor's Parcel Boundaries •
CJ
-
ISSl
c::::J
LAN6AN

ATTACHMENT 4
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.

Parcel No. 8
APN: 045411023000
Parcel No. 7
APN: 045411024000
Pascale Place
Glory
Court
L7-B-28
L7-B-29
L7-B-27
L7-B-26
L7-B-24
L7-B-25
L7-B-23
L7-B-21
L7-B-22
L7-B-19
L7-B-20
L7-B-18
L7-B-16
L7-B-17
L7-B-13
L7-B-14
L7-B-15
L7-B-12
L7-B-10
L7-B-11
L7-B-08
L7-B-09
L7-B-06
L7-B-07
L7-B-04
L7-B-05
L7-B-03
L7-B-02
L7-B-01
L8-B-36
L8-B-35
L8-B-32
L8-B-33
L8-B-34
L8-B-31
L8-B-29
L8-B-30
L8-B-26
L8-B-27
L8-B-28
L8-B-25
L8-B-23
L8-B-24
L8-B-21
L8-B-22
L8-B-19
L8-B-20
L8-B-17
L8-B-18
L8-B-16
L8-B-14
L8-B-15
L8-B-11
L8-B-12
L8-B-13
L8-B-10
L8-B-08
L8-B-09
L8-B-06
L8-B-07
L8-B-04
L8-B-05
L8-B-02
L8-B-03
L8-B-01
13 1
5 33
132
131
127
12 1
6 25
124
122
121
119
118
11 1
7 16
115
114
113
1 1
12 11
110
109
108
106
104
103
102
10 1
1 0
9 0
9 98
97 137
136
134
130
129
128
123
95 94
91 90
97 96
95 94
93 92
99 98
138
120
107
105
96 93
129
130
128
127
125
105
99 97
89 128
Date 4/30/2019 Project 750649501
0 12.5 25 50
Feet
\\langan.com\data\OAK\data5\750649501\Project Data\ArcGIS\MXD\Environmental_Figures\Discrete Sampling Figures_April 2019\Lot Specific Report Figures\Lot 7 8 Haz Waste.mxd User: ogodfrey FORMER HIDDEN GLEN LANDFILL INVESTIGATION Napa, California LOT 7 AND 8 - SITE PLAN

WITH APPROXIMATE SOIL SAMPLE LOCATIONS

EXCEEDING CLASS I NON-RCRA STATE OF

CALIFORNIA HAZARDOUS WASTE CRITERIA

AND RESIDENTIAL ESL FOR LEAD
Figure 2
q Soil Sampling Analytical Results Sample ID Total Lead (mg/kg) STLC (mg/L) TCLP (mg/L) Lot 7
L7-COMP-1 520 17 0.096
L7-B-22 210 14 0.11 L7-B-23 250 17 0.044 L7-B-25 890 33 0.088 L7-B-28 750 21 0.076 L7-COMP-2 25 -- --
L7-B-02 11 -- -- L7-B-09 43 -- -- L7-B-12 54 0.59 -- L7-B-13 90 1.8 -- Lot 8
L8-COMP-1 100 2.6 0.082
L8-B-07 240 5.9 0.081 L8-B-15 320 12 0.15 L8-B-18 54 0.49 -- L8-B-21 23 -- -- L8-COMP-2 36 -- --
L8-B-25 18 -- -- L8-B-28 26 -- -- L8-B-34 21 -- -- L8-B-36 83 1.5 -- Residential ESLs - Cancer Risk
1 82 -- --
Residential ESLs - Non-Cancer Hazard
1 80 -- --
TTLC2 (mg/kg) 1,000 -- --
STLC2 (mg/L) -- 5 -- TCLP2 (mg/L) -- -- 5
Notes:1. San Francisco Bay Regional Water Quality Control Board (RWQCB), Direct Exposure Human Health Risk Levels (Table S-1), Soil Residential: Shallow Soil Exposure, Cancer Risk and Non-Cancer Hazard Environmental Screening Levels, dated January 2019. 2. Hazardous Waste Criteria 3. Bold concentration exceeds the lower of the Cancer Risk or Non-Cancer Risk ESLs. 4. Bold Italicized - concentration exceeds hazardous waste criteria. 5. TTLC - California Total Threshold Limit Concentration - State hazardous waste criterion

6. STLC - California Soluble Threshold Limit Concentration 7. TCLP - Federal Toxicity Characteristic Leaching Procedure 8. World aerial imagery basemap is provided through Langan’s Esri ArcGIS software licensing and ArcGIS online. Credits: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, and the GIS User Community. 9. All features shown are approximate. 10. Site boundary provided by the Napa County parcel dataset, 2016. 11. LiDAR survey data for the northern San Francisco Bay, CA provided by National Oceanic and Atmospheric Administration (NOAA) with accuracy of 1 meter, updated 2010.

Legend
Approximate Location of Soil BoringAdvanced by Langan, November 2018 !.

Discrete Soil Sample Collected for Four-Point Composite Laboratory Analytical Samples (L7-COMP-1, L7-COMP-2, L8-COMP-1, & L8-COMP-2)Approximate Extent of Former Hidden Glenn LandfillLidar Contour - 1ft. IntervalSoil Borings on 15 ft. CentersFormer Hidden Glenn Landfill Buffer - 10 ft.Approximate Location of Soil Sample Exceeding Class I non-RCRA State of California Hazardous Waste Criteriaand Residential ESL for LeadApproximate Location of Soil SampleExceeding Residential ESL for LeadAssessor's Parcel Boundaries •
CJ
-
ICC
LAN6AN

ATTACHMENT 4
!.
!.
!.
!.
!.
!.
!.
!.

Parcel No. 10
APN: 045411020000
Pascale Place
L10-B-46
L10-B-47
L10-B-44
L10-B-45
L10-B-43
L10-B-41
L10-B-42
L10-B-39
L10-B-40
L10-B-34
L10-B-37
L10-B-38 L10-B-32
L10-B-33
L10-B-35
L10-B-36 L10-B-30
L10-B-31
L10-B-24
L10-B-28
L10-B-29
L10-B-22
L10-B-23
L10-B-26
L10-B-27
L10-B-20
L10-B-21
L10-B-25
L10-B-18
L10-B-19
L10-B-16
L10-B-17
L10-B-11
L10-B-12
L10-B-09
L10-B-10
L10-B-08 L10-B-06
L10-B-04
L10-B-05
L10-B-03
L10-B-01
143
135
13 1
4 3
1 3
3 1
2 31
130
129
125
124
123
122
120
11 1
7 16
115
114
11 1
3 1
11 2
1 11
10 0
1 9
08 107
106
105
144
142
141
140
139
138
137
136
128
127
126
121
136
135
134
133
132
131
130
138
137
136
112
111
119
118
104
143
141
129
129
129
128
115
110
104
Date 4/23/2019 Project 750649501
0 10 20 40
Feet
\\langan.com\data\OAK\data5\750649501\Project Data\ArcGIS\MXD\Environmental_Figures\Discrete Sampling Figures_April 2019\Lot Specific Report Figures\Lot 10 Haz Waste.mxd User: bsaylor FORMER HIDDEN GLEN LANDFILL INVESTIGATION Napa, California LOT 10 - SITE PLAN

WITH APPROXIMATE SOIL SAMPLE LOCATIONS

EXCEEDING RESIDENTIAL ESL FOR LEAD
Figure 2
q Soil Sampling Analytical Results Sample ID Total Lead (mg/kg) STLC (mg/L) TCLP (mg/L) L10-COMP-1 37 -- --
L10-B-05 13 -- -- L10-B-18 37 -- -- L10-B-25 11 -- -- L10-B-27 83 0.82 -- L10-COMP-2 140 3.3 0.027
L10-B-12 79 4.5 -- L10-B-23 47 -- -- L10-B-31 140 1.6 0.022 L10-B-42 61 1.1 -- Residential ESLs - Cancer Risk
1 82 -- --
Residential ESLs - NonCancer Hazard
1 80 -- --
TTLC2 (mg/kg) 1,000 -- --
STLC2 (mg/L) -- 5 -- TCLP2 (mg/L) -- -- 5 Notes: 1. San Francisco Bay Regional Water Quality Control Board (RWQCB), Direct Exposure Human Health Risk Levels (Table S-1), Soil Residential: Shallow Soil Exposure, Cancer Risk and Non-Cancer Hazard Environmental Screening Levels, dated January 2019. 2. Hazardous Waste Criteria 3. Bold concentration exceeds the lower of the Cancer Risk or Non-Cancer Risk ESLs. 4. TTLC - California Total Threshold Limit Concentration - State hazardous waste criterion

5. STLC - California Soluble Threshold Limit Concentration 6. TCLP - Federal Toxicity Characteristic Leaching Procedure 7. World aerial imagery basemap is provided through Langan’s Esri ArcGIS software licensing and ArcGIS online. Credits: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, and the GIS User Community. 8. All features shown are approximate. 9. Site boundary provided by the Napa County parcel dataset, 2016. 10. LiDAR survey data for the northern San Francisco Bay, CA provided by National Oceanic and Atmospheric Administration (NOAA) with accuracy of 1 meter, updated 2010.

Legend
Approximate Location of Soil BoringAdvanced by Langan, December 2018 !.

Discrete Soil Sample Collected for Four-Point Composite Laboratory Analytical Sample (L10-COMP-1 & L10-COMP-2)Approximate Extent of Former Hidden Glenn LandfillLidar Contour - 1ft. IntervalSoil Borings on 15 ft. CentersFormer Hidden Glenn Landfill Buffer - 10 ft.Approximate Location of Soil SampleExceeding Residential ESL for LeadAssessor's Parcel Boundaries •
CJ
-
c::::J
LAN6AN

ATTACHMENT 4
!.
!.
!.
!.

City of Napa Parcel
APN: 045411022000
Pascale Place
LA-B-22
LA-B-23
LA-B-20
LA-B-21
LA-B-19
LA-B-17
LA-B-18
LA-B-15
LA-B-16
LA-B-14 LA-B-12 LA-B-13
LA-B-10
LA-B-11
LA-B-09
LA-B-07
LA-B-08
LA-B-05
LA-B-06
LA-B-04
LA-B-03
LA-B-01
LA-B-02
137
136
135
134
133
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
10 9
0 9
98 96
95 94
93 92
12 1
7 26
129
128
9 94
5 97
128
91 128
110
105
101
100
129
128
128
104
Date 4/30/2019 Project 750649501
0 10 20 40
Feet
\\langan.com\data\OAK\data5\750649501\Project Data\ArcGIS\MXD\Environmental_Figures\Discrete Sampling Figures_April 2019\Lot Specific Report Figures\Lot A Haz Waste.mxd User: ogodfrey FORMER HIDDEN GLEN LANDFILL INVESTIGATION Napa, California LOT A - SITE PLAN

WITH APPROXIMATE SOIL SAMPLE LOCATIONS

EXCEEDING CLASS I NON-RCRA STATE OF

CALIFORNIA HAZARDOUS WASTE CRITERIA

AND RESIDENTIAL ESL FOR LEAD
Figure 2
q Soil Sampling Analytical Results Sample ID Total Lead (mg/kg) STLC (mg/L) TCLP (mg/L) LA-COMP-1 53 1.5 --
LA-B-08 12 -- -- LA-B-10 50 0.49 -- LA-B-18 150 7.7 0.044 LA-B-19 34 -- -- Residential ESLs - Cancer Risk
1 82 -- --
Residential ESLs - Non-Cancer Hazard
1 80 -- --
TTLC2 (mg/kg) 1,000 -- --
STLC2 (mg/L) -- 5 -- TCLP2 (mg/L) -- -- 5
Notes:1. San Francisco Bay Regional Water Quality Control Board (RWQCB), Direct Exposure Human Health Risk Levels (Table S-1), Soil Residential: Shallow Soil Exposure, Cancer Risk and Non-Cancer Hazard Environmental Screening Levels, dated January 2019. 2. Hazardous Waste Criteria 3. Bold concentration exceeds the lower of the Cancer Risk or Non-Cancer Risk ESLs. 4. Bold Italicized - concentration exceeds hazardous waste criteria. 5. TTLC - California Total Threshold Limit Concentration - State hazardous waste criterion

6. STLC - California Soluble Threshold Limit Concentration 7. TCLP - Federal Toxicity Characteristic Leaching Procedure 8. World aerial imagery basemap is provided through Langan’s Esri ArcGIS software licensing and ArcGIS online. Credits: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, and the GIS User Community. 9. All features shown are approximate. 10. Site boundary provided by the Napa County parcel dataset, 2016. 11. LiDAR survey data for the northern San Francisco Bay, CA provided by National Oceanic and Atmospheric Administration (NOAA) with accuracy of 1 meter, updated 2010.

Legend
Approximate Location of Soil BoringAdvanced by Langan, December 2018 !.

Discrete Soil Sample Collected for Four-Point Composite Laboratory Analytical Sample (LA-COMP-1)Approximate Extent of Former Hidden Glenn LandfillLidar Contour - 1ft. IntervalSoil Borings on 15 ft. CentersFormer Hidden Glenn Landfill Buffer - 10 ft.Approximate Location of Soil Sample Exceeding Class I non-RCRA State of California Hazardous Waste Criteriaand Residential ESL for LeadAssessor's Parcel Boundaries I
\
\
\
I
I
I
I
I
\
\
\
' ' '
•
CJ
-
es2SI
c:::J
LAN6AN

ATTACHMENT 4
Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX D
Site Health and Safety Plan

Site Health and Safety Plan
Hidden Glen Dump
Coombsville Road
Napa, California
SWIS No. 28-AA-0028
Napa County Local Enforcement Agency
1195 Third Street, Suite 210 I Napa, California 94559
October 1, 2024 | Project No. 109558001
Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS Geotechnical & Environmental Sciences Consultants

Stephen J. Waide, CIH, CSP, CIEC, CMC
Principal Environmental Scientist
Site Health and Safety Plan
Hidden Glen Dump
Coombsville Road
Napa, California
SWIS No. 28-AA-0028
Mr. Peter Ex, REHS
Napa County Local Enforcement Agency
1195 Third Street, Suite 210 I Napa, California 94559
October 1, 2024 | Project No. 109558001
5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 | www.ninyoandmoore.com NDD/BAB/SW/mp
Geotechnlcal & Environmental Sciences Consultants

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 i

CONTENTS
1 INTRODUCTION 1
2 PROJECT OBJECTIVES AND SCOPE 1
3 SITE LOCATION AND DESCRIPTION 2

3.1 General 2

3.2 Known Contaminants 2
4 KEY PERSONNEL AND RESPONSIBILITIES 2
5 EMPLOYEE TRAINING ASSIGNMENTS 3

5.1 General Training Requirements 3
6 HAZARD IDENTIFICATION AND ANALYSIS 3

6.1 Chemical and Explosive Hazards 4

6.2 Dust 4

6.3 Odors 4

6.4 Landfill Gases 4

6.4.1 Methane Gas 5

6.4.2 Hydrogen Sulfide 5

6.4.3 Vinyl Chloride 5

6.5 Metals 5

6.6 Petroleum Hydrocarbons 6

6.7 Semi-Volatile Organic Compounds 6

6.8 Organochlorine Pesticides 7

6.9 Polychlorinated Biphenyls 7

6.10 Physical Hazards 8

6.10.1 General Physical Hazards 8

6.10.2 Vehicle and Heavy Equipment Operation 8

6.10.3 Slip, Trip and Fall 8

6.10.4 Manual Lifting Techniques 9

6.10.5 Noise 9

6.10.6 Sunburn 9

6.10.7 Heat Stress 9

6.11 Waste Disposal Site Excavation Hazards 10

6.11.1 Buried Objects 11

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 ii

6.11.2 Wastes and Soil Excavation/Trenching 11

6.11.3 Overhead Hazards 11

6.11.4 Fire and Explosion Hazards 12

6.11.5 Oxygen Deficiency 12

6.12 Biological Hazards 12

6.12.1 Rattlesnakes 12

6.12.2 Insects and Arachnids 13

6.12.3 Poisonous Plants 13

6.13 Radiological Hazards 13
7 SPILL PREVENTION AND CONTROL MEASURES 14

7.1 Preventive Measures 14

7.2 Spill Containment Measures 14

7.3 Record Keeping and Notifications 15
8 HAZARD MONITORING 15

8.1 Air Monitoring 15

8.2 Instrumentation 15

8.3 Frequency 15

8.4 Dust Monitoring 15

8.5 Calibration and Documentation 16

8.6 Personnel Monitoring 16

8.7 Fire Extinguishers 17

8.8 Severe Weather 17
9 PERSONAL PROTECTIVE EQUIPMENT 17
10 CONFINED SPACE ENTRY 18
11 DECONTAMINATION 18

11.1 Personnel Decontamination 18

11.2 Vehicle and Equipment Decontamination 18
12 MEDICAL SURVEILLANCE REQUIREMENTS 19
13 SITE CONTROL 19

13.1 Controlled Area Designation 19

13.2 Open Trenches 19

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 iii 14 CONTINGENCY PLAN 20
15 EMERGENCY ACTION PLAN 20
TABLES
1 – Key Personnel and Contact Information 3
2 – Training Assignment Matrix 3
3 – Radiation Types and Action Levels 14
4 – Air Monitoring Action Levels 16
5 – Action Levels for Heat Stress 17
6 – Personal Protective Equipment Levels 18
FIGURE
1 – Hospital and Route Map

APPENDIX
A – Site Health and Safety Plan Acknowledgement Form

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 1 1 INTRODUCTION
This Site Health and Safety Plan (SHSP) provides policies, information, requirements, and guidelines regarding procedures to be followed by field personnel, subcontractors, and others during the implementation of the Remedial Action Plan for the Hidden Glen dump (site). The site is located near the intersection of Pascale Place and Glory Court in Napa, California (Figures 1 and 2 of the RAP).

An effective SHSP is one that is comprehensive enough to provide for contingencies, and also to provide a structure for handling a variety of situations as they arise, but concise enough so that site workers understand the potential hazards and are able to follow the procedures to reduce the level of risk. It should be noted that no SHSP can completely eliminate risk from a work site. Site personnel working within the work area will be trained and current in accordance with the standards provided by Hazardous Waste Operations and Emergency Response (HAZWOPER) (40-hour initial training with annual updates). Appropriate management personnel will also have 8-hour supervisor training. All personnel, including subcontractors, working in or near the Project will have current HAZWOPER certification. The requirement for current HAZWOPER certification of personnel (tradesmen) working onsite but not related to the Project will be at the discretion of the SHSO.

The Ninyo & Moore Certified Industrial Hygienist (CIH) assisted and oversaw preparation of this SHSP. The CIH will discuss the contents of this plan with the Site Health Safety Officers (SHSO) immediately prior to beginning fieldwork, and as necessary, during the course of the Project. The air monitoring/field screening will be conducted to comply with the SHSP.

This SHSP was prepared in general accordance with the Federal Occupational Safety and Health Administration Hazardous Waste Operations and Emergency Response Standard (29 Code of Federal Regulations 1910.120) and California Code of Regulations, Title 8 Section 5192. Work will be performed under the oversight of a California-licensed professional geologist (PG) and/or certified engineering geologist (CEG).
2 PROJECT OBJECTIVES AND SCOPE
Details of the remedial action is included in the Remedial Action Plan (RAP) prepared concurrent with this SHSP. The remedial action for the site generally consists of excavating and removing wastes in the buffer zone (Figure 2 and 3 of the RAP) (e.g., areas between the capped portion of the dump and the adjacent residential properties/lots) and reconsolidating these wastes onsite at the southeast portion of the capped dump. Excavated waste may be reconsolidated onsite or, at the City’s discretion, disposed of at an offsite waste facility.

Reconsolidated waste will be placed on the existing cap and covered with 2 feet of clean

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 2 imported soil. At a minimum, waste will be removed within the buffer zone and extend to the adjacent property boundaries. Under this option, no waste will be removed from the adjacent properties. However, if an adjacent property owner agrees, waste removal will “feather” from the buffer zone across the property line.
3 SITE LOCATION AND DESCRIPTION

3.1 General
The site as it pertains to the RAP is the City-owned Parcel A consisting of the capped portion of the dump and the area between the capped area and the adjacent properties referred to as the “buffer zone” (Figure 2). The dump is located in a residential setting with wastes occurring at the previously capped portion of the dump, “buffer zone” and at adjacent residential properties downslope to the north, west, and south and generally upslope to the east. Adjacent residential properties are not separated by a road or other features. A cemetery is located across Pascale Place to the west.

3.2 Known Contaminants
Based on historical records of the City owned parcel and adjacent properties, wastes generally consists of automobiles, general garbage burned and spread, tree prunings and brush, asphalt and concrete wastes, metal slag, rusted metal, wood fragments, brick and/or pottery fragments, glass including melted glass, gravel debris, and small fragments of charcoal.

Based on historical records elevated lead and total petroleum hydrocarbons (TPH) concentrations were detected at the dump site and on adjacent properties. Other constituents of potential concern (COPCs) include landfill gas, metals, total petroleum hydrocarbons (TPH), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), and volatile and semivolatile organic compounds (VOCs and SVOCs, respectively). PCBs, OCPs, VOCs and SVOCs were detected in soil samples at concentrations below their respective Region Water Quality Control Boards Environmental Screening Levels and may be present at the site. 4 KEY PERSONNEL AND RESPONSIBILITIES
This section describes key personnel and their responsibilities. Job titles and applicable contact information is provided in the following Table 1.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 3 Table 1 – Key Personnel and Contact Information
Title Name Office Cell Phone E-mail
City of Napa Engineer
and Project Manager Chris Jones 707.257.9460 310.344.5676 [email protected] Ninyo & Moore
Senior Staff, SHSO
Connor
Escobar 408.435.9000 408.393.4233 [email protected] Ninyo & Moore
Project Manager
Nathan
Diem 858.576.1000 510.584.7217 [email protected]
Ninyo & Moore
Principal Geologist
Beth
AbramsonBeck858.576.1000 760.492.6249 [email protected] Ninyo & Moore
Corporate Health and
Safety Manager
Jason Shipe 858.576.1000 714.852.2160 [email protected] 5 EMPLOYEE TRAINING ASSIGNMENTS

5.1 General Training Requirements
A matrix summarizing training requirements for Ninyo & Moore personnel, excavation subcontractor personnel, visitors, and vendors is presented in the following table:

Table 2 – Training Assignment Matrix
Category
40-Hour

HAZWOPER
8-Hour
Refresher
24 Hours
Supervised
Experience
8-Hour
Supervisor
Excavation
Competent
Person
Ninyo & Moore SHSO X X X X X
RABC-ECC Construction
Supervisor X
Subcontractor Supervisor X X X X X
Subcontractor Staff X X X
Visitor X1 X1 X1
Vendor X1 X1 X1
Note:
1 = Not required if escorted
6 HAZARD IDENTIFICATION AND ANALYSIS
The potential hazards to personnel working at the site include, but are not limited to the following:
• Chemical exposure associated with unknown types of wastes. • Explosive hazards related to landfill gases/elevated methane concentrations. This plan specifies safe working practices including monitoring and avoiding and/or dealing with management of potential explosive gas conditions.
• Physical hazards related to the site use of the property that uses heavy equipment (trucks and other machinery; presence of partially obscured uneven terrain and stockpiled soils and debris; noise; and excavation hazards including cave-ins and atmospheric hazards, and encountering unknown and/or unidentifiable buried objects and potentially hazardous materials associated with the wastes and heat stress and sunburn.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 4 • Biological hazards (ticks, bees, wasps, snakes, spiders).

Each potential hazard is described below.

6.1 Chemical and Explosive Hazards
Health hazards associated with potential chemical exposures at this site include toxic and potentially explosive environments. The most likely route for exposure to toxic chemicals is through inhalation of chemical vapors or contaminated dust that could potentially be released from the subsurface during excavation or trenching. Secondary routes for chemical exposure include dermal absorption, injection, and ingestion. Exposure to explosive levels of contaminants, particularly landfill gases may be encountered during Project site activities. The overall risk to field personnel from these potential exposures will be controlled through the use of careful airborne monitoring, PPE and safe work practices as described in this plan under Hazard Monitoring, PPE and Site Control, respectively.

Based on background information, expected COPCs are discussed in Section 3.2. Conservative action levels for these contaminants have been identified in this plan. Refer to Section 9, Hazard Monitoring, for appropriate action levels regarding the potentially hazardous materials/COPCs.

6.2 Dust
Material removal, stockpiling of bulk soil and other materials, handling of potentially contaminated soil or other items, and general excavation and grading can generate airborne dust that can become a nuisance or a hazard to nearby sensitive receptors. In addition, certain contaminants can adhere or adsorb to various particles in dust, resulting in potential offsite impacts. Visible dust will be monitored and controlled at the site by the Contractor. The Project Environmental Consultant will monitor dust at the site perimeter during soil disturbance activities, if indications of possible contamination are encountered.

6.3 Odors
If landfill wastes are encountered, odors may be present as a result of degradation of buried organic wastes in the landfill. Odor monitoring by qualitative (olfactory) and semi-quantitative (photoionization detector [PID]) methods and by LFG monitoring will be performed to identify potential odor issues.

6.4 Landfill Gases
Because of the possibility of decomposition of organic materials buried at the site (e.g., municipal solid waste), a discussion of landfill gases is necessary. Decomposition of organic

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 5 material results in the production of several gases that may present a safety and health concern.

6.4.1 Methane Gas
Methane gas has been monitored at the site since December 2020 and is currently monitored on a quarterly basis. Methane monitoring results have been below regulatory limits during all monitoring events. Methane gas may be encountered during excavation activities. Methane is odorless and non-toxic, but can present an explosive hazard in high concentrations, can act as a simple asphyxiant (can displace oxygen) in low-lying areas or confined spaces, and may be an indicator of the presence of other potentially hazardous landfill gases. Methane will continue to be monitored as an explosive gas.

6.4.2 Hydrogen Sulfide
Hydrogen sulfide (H2S) is a colorless, heavier-than-air gas with a characteristic odor. (Note that desensitization can occur, i.e., the inability to “smell” the odor, resulting in increased danger of overexposure.) H2S is commonly found at landfills as a result of waste decomposition. It can be toxic or fatal if inhaled in high concentrations.

6.4.3 Vinyl Chloride
Vinyl chloride results from the decomposition of chlorinated materials such as plastics and solvents. Vinyl chloride is a recognized human carcinogen. The Occupational Safety and Health Administration (OSHA) standard for vinyl chloride (to occupational workers) established an exposure limit of 1 ppm as a time-weighted average (TWA) and 5 ppm as a short-term exposure limit (i.e., 15 minutes). The action levels established for this site are designed to adequately protect the public from fugitive emission of this toxic gas. In the unlikely event that site conditions indicate the need to monitor worker exposures to vinyl chloride, perimeter monitoring will be initiated. The CHSM will determine the type and frequency of monitoring based on site conditions.

6.5 Metals
Elevated concentrations of lead at the site have been documented during previous site assessments activities. Although metal and metal ions do not present volatility or flammability problems, they can present acute and chronic effects if the host material is inhaled in the form of dust or fumes. Metal ions can cause irritation of mucous membranes and lung tissues and some metals such as lead are suspected carcinogens. Public exposure to metals in the burned waste

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 6 and soil by dermal contact or ingestion is not likely. Therefore, this plan addresses potential exposure by inhalation of dust containing metals generated by site activities.

Lead is the primary metal of concern. It is a toxic heavy metal and a suspected carcinogen that may be encountered in inorganic or organic forms. The Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL)- time weighted average (TWA) for lead in air is 0.05 milligram per cubic meter (mg/m3). Visible dust will be monitored and controlled during construction activities as described in Section 7.

6.6 Petroleum Hydrocarbons
TPHmo and TPHd were detected in soil samples in adjacent properties (Langan, 2019). TPH is a term used to describe a large family of several hundred chemical compounds that originally come from crude oil. TPH is a mixture of chemicals, but they are all made mainly from hydrocarbons.

Some chemicals that may be found in TPH are hexane, jet fuels, mineral oils, benzene, toluene, xylenes, naphthalene, and fluorene, as well as other petroleum products and gasoline components.

Some of the TPH compounds can affect your central nervous system. One compound can cause headaches and dizziness at high levels in the air. Another compound can cause a nerve disorder called "peripheral neuropathy," consisting of numbness in the feet and legs. Other TPH compounds can cause effects on the blood, immune system, lungs, skin, and eyes.

Animal studies have shown effects on the lungs, central nervous system, liver, and kidney from exposure to TPH compounds. Some TPH compounds have also been shown to affect reproduction and the developing fetus in animals. The International Agency for Research on Cancer (IARC) has determined that one TPH compound (benzene) is carcinogenic to humans.

IARC has determined that other TPH compounds (benzo[a]pyrene and gasoline) are probably and possibly carcinogenic to humans. Most of the other TPH compounds are considered not to be classifiable by IARC.

6.7 Semi-Volatile Organic Compounds
Semi-volatile organic compounds (SVOC) have been detected in soil samples below regulatory screening levels from adjacent properties and include bis (2-ethylhexyl), phthalate, and pyrene (Langan, 2019). Although SVOCs have not been detected at elevated concentrations, SVOCs may be encountered during excavation actives and for the purpose of this CHSP, hazards are explained below.

SVOCs area organic compound which have a boiling point higher than water and which may vaporize when exposed to conditions above room temperature. Significant airborne levels of

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 7 SVOCs are not typical during fieldwork however they can be present in airborne dust. SVOCs include phenols and PAHs. Short-term effects of phenol exposure include respiratory irritation, headaches, and burning eyes. Chronic effects of high exposures include weakness, muscle pain, anorexia, weight loss, and fatigue; effects of long-term low-level exposures include increases in respiratory cancer, heart disease, and effects on the immune system. PAHs are produced from coal tar and other sources and are used in a variety of industrial products. PAH is a recognized human carcinogen. Studies in animals have also shown that PAHs can cause harmful effects on skin, body fluids, and the body's system for fighting disease after both shortand long-term exposure; however, these effects have not been reported in people. The current OSHA PEL is 0.2 milligrams per cubic meter (mg/m3); however, exposure by any route to PAH and other recognized human carcinogens will be maintained at the absolute practicable minimum level. Exposure to SVOCs are expected to be adequately controlled with the designated action levels for airborne vapor and dust.

6.8 Organochlorine Pesticides
OCPs were detected in soil samples below regulatory screening levels in adjacent properties and include endosulfan, p,p-DDD, p,p-DDE, and p,p-DDT, aldrin, alpha- BHC, and dieldrin (Langan, 2019). As with PAHs above, action levels for lead and total dust will serve to keep exposure to OCPs well below recognized exposure limits and should eliminate offsite impacts.

6.9 Polychlorinated Biphenyls
PCBs have been detected in soil samples below regulatory screening levels. Although PCBs are not expected at elevated concentrations, for the purposes of this CHSP, hazards are described below.

PCBs, also referred to as aroclors, are synthetic industrial products which have been commonly used as cooling fluid and for electrical insulation. PCBs are common contaminants of oily type waste and are found around railroad tracks and in industrial areas and dumps. PCBs are recognized environmental pollutants and suspected human carcinogens.

The United States Environmental Protection Agency (EPA) currently classifies PCBs as a Class B2, or probable, human carcinogen. Skin exposure may contribute significantly to uptake of these chemicals, and therefore all skin exposure should be strictly avoided. Work involving exposure to PCBs above the atmospheric action level or in contact materials exceeding 100 micrograms per gram may require special medical evaluation and approval of the SHSO.

PCBs are not volatile and exposure will be controlled by limiting airborne dust.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 8

6.10 Physical Hazards
Accidents involving physical hazards can directly injure field personnel and can create additional hazards such as increased exposure to chemicals due to damaged protective equipment. One of the most common potential hazards is improper bending and lifting which may result in back injuries. Field personnel should implement proper lifting techniques when handling equipment and material. Field personnel should maintain awareness of potential safety hazards at each specific activity location and should immediately inform other field personnel of any new hazards so that corrective measures can be taken.

6.10.1 General Physical Hazards
The site is currently an undeveloped open space. Portions of the property currently include uneven terrain and steep slopes around the perimeter. A careful pre-work walkover should be made of each work area and potential access or egress routes. Unsafe areas may be flagged or taped and will be identified to all field personnel.

6.10.2 Vehicle and Heavy Equipment Operation
Vehicles should only be operated in authorized areas. When moving equipment, caution should be exercised in order not to damage equipment or cause injury. When backing up heavy vehicles (larger than pickup trucks), passenger vehicles, or pickups with obscured rear vision, a guide should be used to direct the vehicle. Extra caution should be exercised during vehicle operation on dike roads, industrial areas, and other close spaces. Personnel directing traffic should wear orange vests. Each vehicle should be equipped with a minimum of one fire extinguisher rated 3A:40B:40C.

6.10.3 Slip, Trip and Fall
Possible slip, trip and fall hazards can occur at the site due to the uneven and potential obscured terrain during construction activities. The SHSO will remind field personnel at the daily tailgate meetings to maintain sure footing on all surfaces. In addition, although unlikely at this time of year, wet weather conditions may also pose such hazards when working outdoors. The work locations will be kept as tidy as possible and in order to minimize tripping hazards caused by job supplies and equipment, tools and materials should not be left randomly on surfaces when not in direct use. Foot traffic should avoid areas where materials are stored on the ground. Any hoses and cables should be grouped, routed to minimize hazards, and covered with a ramp or bridge or clearly marked with hazard tape or flags if such material will remain in place for more than one day. Personnel should wear appropriate footwear for site conditions and walk carefully.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 9

6.10.4 Manual Lifting Techniques
During any manual material-handling tasks, personnel will be trained to lift with the force of the load suspended on their legs and not on their backs. An adequate number of personnel or an appropriate mechanical device must be used to safely lift or handle heavy equipment. When heavy objects must be lifted manually, workers should keep the load close to the body and avoid any twisting or turning motions to minimize stress on the lower back. A lifting orientation and specific back stretching and warm-up exercises will help minimize the potential for back injuries.

Use of these exercises by all field personnel at the start of each shift should be encouraged.

6.10.5 Noise
Noise is a potential hazard in areas where heavy equipment is operated such as during the Project activities. Intermittent high noise levels are expected at the site associated with the use of mechanical excavation equipment. Ambient noise levels as well as equipment operation will likely result in noises that reach or exceed 85 decibels, the action level established by the OSHA. Exposure to elevated noise levels can lead to temporary or permanent hearing loss and can also cause muscle tension and irritability. The SHSO will ensure hearing protection is utilized when noise levels are elevated. Elevated noise levels will be evaluated by the SHSO when equipment is operated. Excess noise levels can be estimated using the following rule of thumb. When normal voice communication is not possible between field personnel who are no more than 3 feet apart, hearing protection will be utilized. Hearing protection typically involves the use of disposable ear plugs for the duration of the excessive noise condition and will be used during operations that present a noise hazard.

6.10.6 Sunburn
Working outdoors on sunny days for extended periods of time can cause sunburn. Excessive exposure to sunlight is associated with the development of skin cancer. Field staff should take precautions to prevent sunburn by using sun-screen lotion and/or wearing hats and longsleeved garments.

6.10.7 Heat Stress
Heat stress is an important health consideration on worksites. High temperatures, in conjunction with wearing personal protective clothing, may aggravate heat-stress problems.

Standard measures, including designating a shaded rest area, taking frequent rest breaks, and performing heat-stress monitoring of workers, will be used to minimize heat-stress-related problems. A readily available supply of liquids, such as water and fluids containing electrolytes, will be available at the work site to replenish body fluids. Visual observation of workers by the

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 10 SHSO for heat-stress-related signs and symptoms, and body core temperature monitoring will be performed when outside temperatures exceed 70 degrees Fahrenheit (°F) and impermeable clothing is being worn, when outside temperatures exceed 90°F in street clothes, or whenever other conditions warrant. Signs and symptoms of heat stress include profuse sweating, headache, skin flushing, dizziness, confusion, and rapid heart rate. Workers exhibiting a body core temperature of 100.4°F or greater (measured at the ear drum) will be removed to a cooler area or activity until body core temperature returns to below 99°F.

If persons exhibiting heat-stress symptoms are left untreated, the condition can elevate to heat stroke. Heat stroke is typically manifested by hot, dry skin with a body core temperature of 104°F or greater. Heat stroke can be fatal if treatment is delayed. Therefore, persons exhibiting heat-stroke symptoms need to have their core temperature reduced immediately by use of cold packs, cold water wipes, or immersion. Heat-stroke victims need to be transported to a professional medical facility immediately after the victim’s core temperature has been reduced or while the victim’s core temperature is being reduced.

6.11 Waste Disposal Site Excavation Hazards
Project activities at waste disposal sites may expose personnel to various health and safety hazards. The following sections present a summary of the common hazards expected and general methods that will be utilized by the SHSO to help assure worker safety. The SHSO or designee will observe all operations to oversee safety hazards.

Before the start of excavation activities, a "competent person" in accordance with 29 CFR 1926.650 (a person who has the knowledge and training to identify hazards and the authority to correct the hazards) will ensure that the following activities are completed:
• Remove or secure any surface obstacles, such as trees, rocks and sidewalks, that may create a hazard.
• Classify the type of soil and rock deposits at the site. One visual and at least one analytical classification should be made.

The following safety rules must be implemented during excavation activities when personnel are to enter the excavation:
• In excavations greater than four feet, and where hazardous atmospheres exist, or could reasonably be expected to exist, the competent person will test the air before entering the excavation. The competent person will use a photo-ionization detector (PID) to test for VOCs and a combustible gas indicator (CGI) to test for the presence of oxygen, carbon monoxide, hydrogen sulfide, and explosive concentrations of gases or vapors.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 11 • Keep materials or equipment that might fall or roll into an excavation at least two feet from the edge.
• Adequate protection from falling rock, soil or other materials and equipment will be provided in the form of benching, sloping or shoring.
• Do not work in excavations where water has accumulated, or is accumulating, unless adequate precautions have been taken.
• Do not cross over an excavation unless walkways are provided. Guardrails must be provided if the walkway is six feet or more above the bottom of the excavation.

6.11.1 Buried Objects
Buried and partially buried objects such as metal objects, metal cans, lead pipes, glass bottles, broken and melted glass, concrete, asphalt, and brick debris may occur buried, partially buried, and/or near the surface at portions of the site. Workers must take care to prevent injury from handling previously buried objects, including, when necessary, the use of leather outer gloves.

Although not likely, buried underground cables may be present on portions of this site, therefore, an underground utility check should be performed before subsurface construction activities. These pipelines present a source of a potential fire and explosion hazard. All work areas should be cleared prior to trenching and drilling by notifying Underground Service Alert (USA), performing private geophysical clearance (if required), and potholing or other means, as appropriate. In addition, when locations of buried lines are uncertain, excavation should always be performed by hand until the utility is located or the area is cleared.

6.11.2 Wastes and Soil Excavation/Trenching
Excavation of wastes and potentially contaminated soil presents multiple hazards to workers including chemical exposure, fire and explosion hazards, confined space, and exposure to hazards of contacting unidentified energized utilities. A Competent Person will be on site during all excavation activities that will identify the numerous safety issues associated with trenching/excavation. Section 10, Confined Space Entry, provides additional information.

6.11.3 Overhead Hazards
Overhead cables are not expected at the site. If overhead cables are encountered near excavation areas, a hazard analysis should be reviewed prior to operating heavy equipment (excavators) underneath or within 10 feet of the maximum reach of the equipment. All field vehicles and equipment should be maintained at a minimum distance of 10 feet, vertically and

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 12 horizontally, from all electrical power lines (energized lines) and/or electrical equipment with a voltage less than or equal to 50 kilovolts (kv). If the voltage exceeds 50 kv, the clearance will be increased by 4 inches for every 10 kv over that voltage. The location and marking of such lines and equipment will be coordinated with USA prior to the start of construction/excavation activities.

6.11.4 Fire and Explosion Hazards
Care will be taken to assure that explosive mixture monitoring is performed where appropriate, in an adequate manner and that ignition sources are controlled or eliminated.

Combustible gas indicators (CGIs) (aka 5-gasMiniRae) measure explosive mixtures of all landfill gases and will be used for health and safety monitoring onsite without regard to other instruments, which might be used for added information such as the specific components of the gases. The action levels in this plan are based on total LEL measurement and are found in Section 8, Table 4.

6.11.5 Oxygen Deficiency
Oxygen deficiency can occur in confined spaces, open trenches/test pits, or low-lying areas as a result of displacement by another gas (landfill gases, chemical decomposition, or leaking gas cylinders) or by the consumption of oxygen by chemical reaction (rust). Excavations/trenches will not be entered by field personnel once the excavation depth exceeds 3 feet bgs. The SHSO will monitor trenches/test pits and any suspected low-lying areas prior to initial entry.

6.12 Biological Hazards
The SHSO will inform field personnel of the biological hazards at the site. Multiple biological hazards may be present at the site. The most common hazards anticipated are discussed below.

6.12.1 Rattlesnakes
Personnel should be extremely careful when walking through tall grass, rocks, or debris. If a rattlesnake is encountered, slowly and quietly back away from the snake. Inform all personnel at the site of its location. Do not attempt to move or kill a snake because certain species of rattlesnake are protected under state and federal laws. In the event of a snake bite, immediately summon emergency medical services and notify the SHSO. Do not try to move the affected limb; instead, immobilize the injured area, keeping it lower than the heart if possible, and wait for transportation. Do not apply ice, do not cut the wound, and do not apply a tourniquet. The venom should be wiped off the skin since venom will attack intact skin. If you

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 13 know the victim cannot receive medical care within 30 minutes, consider suctioning the wound using a snakebite kit.

6.12.2 Insects and Arachnids
Bees, wasps, yellow jackets, black widow spiders, scorpions, and brown recluse spiders present a potential hazard on this project, especially so for those individuals sensitized to those bites or stings. Prior to initial assignment on this project, personnel with known allergic responses to insect stings will be identified and field supervisors made aware of this condition.

These personnel will also carry an antidote kit if so advised by their physician. The SHSO will confirm that the antidote kit is accessible and notify the emergency medical service providers in the event of any incident.

In all cases, a victim suspected of being bitten by either a black widow or brown recluse spider, or stung by a scorpion will receive medical attention. The venom from the brown recluse spider is capable of causing coma and kidney failure in its victim.

Protection methods against insects may be employed, such as the use of protective clothing or insect repellents, as well as extermination measures, and training in recognition and identification of harmful insects.

6.12.3 Poisonous Plants
Poisonous plants likely are not, but may be present at the site. Poison ivy, poison oak, and poison sumac are identified by three leaves or five leaves emanating from a stem. The plants contain a resin that causes a delayed allergic hypersensitivity reaction on contact. The resin is active in live, dead, dry, and burned plant parts; and it may be carried through the air. Signs and symptoms are usually evident within 24 to 48 hours after exposure. These include burning, stinging, and blisters. Skin reactions associated with the exposure of poisonous plants can be reduced by the application of pre-contact and cleanser treatments applied to the skin prior to and during fieldwork, respectively. If exposure or contact occurs, wash the affected area, but do not spread the resin to uncontacted areas.

6.13 Radiological Hazards
Radioactive hazards are not expected at the site but waste disposal sites of this era contain unclassified wastes and therefore may include radioactive materials. The decision to monitor for radioactive materials will be at the discretion of the SHSO. If determined necessary by the SHSO(s), a general-use alpha-beta-gamma detection instrument will be used to screen materials. The following table provides radiation types and their properties.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 14 Table 3 – Radiation Types and Action Levels
Type Measurement Action Level Action
External alpha/beta/gamma > 2 X Background Contact CIH
Transferable alpha/beta/gamma contamination > 2 x background Contact CIH Notes:
mR = milliroentgen
CSHM = Corporate Health and Safety Manager
The action level for contacting the project Certified Industrial Hygienist (CIH) is set at two times (2x) background radiation.
7 SPILL PREVENTION AND CONTROL MEASURES
Liquids and other potentially spilled materials are not anticipated to be used during this fieldwork. In case unanticipated conditions are encountered and these types of materials are subsequently brought into the field, the following applies:

7.1 Preventive Measures
• Inspect all containers upon delivery to the site for visible defects and ensure that each drum or container includes a re-sealable lid.
• Set any 55-gallon drums on wooden pallets where possible. • Perform weekly inspections of the storage area.
• Select flat areas for temporary storage away from high-traffic zones and storm or sewer drains.

7.2 Spill Containment Measures
The following actions will be taken by RABC-ECC or their subcontractor field personnel assigned to the field activities in the event of a spill:
• The Project Manager and SHSO(s) are to be notified immediately; • Workers not involved in spill containment and/or cleanup shall evacuate the immediate area and designated emergency response personnel attired in appropriate PPE (see Section 9), shall proceed to the spill area with a spill cleanup and control kit, including absorbent materials; • Attempts shall be made to stop the source(s) of spillage immediately; and • The SHSO shall monitor for exposure to chemicals or hazardous substances during spill cleanup work and shall stay at the spill area until the area has been cleared, inspected, and readied for reentry. A spill incident report shall be prepared by the SHSO.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 15

7.3 Record Keeping and Notifications
The SHSO shall thoroughly document the spill in an Incident Report which will be forwarded to the Corporate Health and Safety Manager and Project Manager(s). Records of all hazardous materials releases shall be maintained with the project files. The Project Manager(s) will make any necessary notifications to off-site authorities and the SHSO will approve the reentry to the site for routine use and will issue a final release report pertaining to cleanup of the area. 8 HAZARD MONITORING
During fieldwork, excavating/trenching will be performed in only one area at a time using a CAT excavator (or equivalent). Air monitoring will be performed during excavating/trenching, at the point of contact with wastes and soil being excavated and near the worker’s breathing zones. The person to be monitored will likely be personnel in the closest proximity to open trenches. The methods, frequencies, and action levels for chemical agent monitoring are specified in Table 4.

8.1 Air Monitoring
Air monitoring for the purposes of worker protection will occur during all intrusive activity (waste excavation). While entry into excavations/trenches is not anticipated appropriate instrumentation, a 5- gas MiniRae [or equivalent] will be used on site to allow the SHSO to obtain the best available information on potential atmospheric hazards.

8.2 Instrumentation
The monitoring instrument to be used during site activities is a 5-gas MiniRae meter (or equivalent).

The 5-gas meter will be used to measure landfill gases, lower explosive limit (LEL), oxygen levels (as applicable), and VOCs.

8.3 Frequency
Air monitoring for background levels of air contamination upwind of each work location will be performed prior to the start of field activities. Air monitoring with above described instruments will be conducted at a minimum of every 30 to 60 minutes or at the direction of the SHSO. When excavating in waste or if Level “C” conditions are encountered, air monitoring will be performed continuously.

8.4 Dust Monitoring
Dust production will be monitored visually. Airborne exposure to metals, PAHs, PCBs, and dioxins generally occurs through inhaling dust. Vapor monitoring devices do not detect airborne particles and are not a reliable protective method. Therefore, whenever visible airborne dust is produced during site activities, dust suppression techniques such as lightly misting or wetting the area or modifying work

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 16 processes will be required. Although not anticipated, wearing Level “C” PPE (using a respirator with HEPA/OV cartridges) will be required if significant dust cannot be mitigated. The SHSO will direct site personnel to upgrade PPE, as appropriate.

8.5 Calibration and Documentation
Air monitoring equipment will be maintained and calibrated daily to manufacturer specifications before starting work.

8.6 Personnel Monitoring
Personnel monitoring will be initiated if the action levels are exceeded, and/or personnel are required to work using respiratory protection for periods exceeding one hour.

Table 4 – Air Monitoring Action Levels
Chemical/
Hazard Instrument InitialFrequency Action Level Protection Action Volatile
Organic
Compounds
(Organic
Vapor)
PID
Start of task,
hourly,
continuous if
Background to
2 ppm above
background
No action required.
> 2 ppm
Air purifying respirator, half or full face, level
C protection with appropriate
cartridges
> 5 ppm
Air purifying respirator, full face, Level C
protection, personnel monitoring required to
I.D. contaminants
> 10 ppm Supplied air protection, Level B
> 50 ppm STOP WORK.

Landfill/
Combustible
Gas
RKI Eagle (or
equivalent)
Start of task,
hourly,
continuous if
zone of
contamination
encountered
< 10% LEL6 No action.
10% to 20% LEL
Start continuous monitoring; permit only
classified electrical equipment and
nonsparking tools
> 20% LEL STOP WORK, ascertain source of gas
Oxygen
Concentration

RKI EAGLE
(OR

EQUIVALEN
T)
Start of task,
hourly,
continuous if
zone of
contamination
encountered
< 19.5% O2
Leave area, evaluate reason for deficiency,
monitor again remotely or with immediately
dangerous to life or health (IDLH) entry
program

19.5 to 20.5% O2 Slight deficiency, continue continuous monitoring

20.5 to 21.0% O2 Normal range
> 22.0% O2
Elevated reading, check calibration,
investigate cause, STOP any potential sparkproducing activity No action Hydrogen
Sulfide

RKI EAGLE
(OR

EQUIVALEN
T)
Start of task,
hourly,
continuous if
zone of
contamination
encountered
> 10 ppm H2S
Leave area, evaluate reason for elevated
reading, monitor again remotely or with IDLH
entry program
Dust Aerosol
Monitor
Start of task,
hourly > 1 mg/m3 Stop work, institute engineering controls until no visible dust is present Metals/
Others
Visual Dust
Monitoring Continuous Visible Dust
Upgrade to Level C with organic vapor/highefficiency particulate air (HEPA) cartridges.

Slow work & use dust control (water); stop
work if dust is excessive

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 17 Table 5 – Action Levels for Heat Stress
Type Measurement Action Level Action
Ear insertable core temperature 100.4°F or greater Remove from work Ear insertable core temperature <99°F Return to work

8.7 Fire Extinguishers
At least one, fully-charged fire extinguisher should be present on the site in a visible and accessible location, and the location indicated during the tailgate meetings. The minimum acceptable extinguisher rating is 10-pound ABC. The fire extinguisher should be maintained in a fully-charged condition at all times. Extinguishers are to be periodically inspected and maintained in accordance with manufacturer’s specifications.

8.8 Severe Weather
Most construction activities routinely continue through hot weather, cold weather, and light rain. It is recommended that work stop when rain interferes with construction operations to the point of causing a safety hazard. Such hazards can exist when vision is impaired, when workers are more concerned with staying dry than with the work being done, when footing becomes slippery and difficult, or when equipment stability is compromised. When visible lightening occurs, all operations will stop until conditions clear.
9 PERSONAL PROTECTIVE EQUIPMENT
Based on information obtained from historical documents and site visits, the anticipated level of PPE for most of the field activities will be Level D/modified Level D, and if required, Level C. The minimum required level of personal protection during field activities is Level D. In addition, modified Level D will include the use of chemical-resistant gloves mandatory for field personnel during handling of burned wastes and soils. Ear plugs will be worn if, at any time, verbal communication becomes difficult to comprehend within a radius of 3 feet. All PPE must meet current American National Standards Institute standards.

Level C PPE will be required at any activity location where the levels of contaminants exceed the action levels listed in this plan. Upgrading to Level C PPE involves Level D PPE with the addition of Tyvek coveralls, nitrile gloves, and an appropriate respirator with high efficiency particulate air/organic vapor cartridges (HEPA/OV). The following table describes the PPE associated with each level of protection.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 18 Table 6 – Personal Protective Equipment Levels
Level Body Respirator Skin Other
D
Normal work
clothes
Long pants
None Nitrile or Work gloves Hard hat
Safety glasses
Mod. Da Tyvek suit None
Chemical-resistant latex or
nitrile gloves
Hard hat
Safety glasses
C Tyvek suit Air purifying respirator with
HEPA and OV
Chemical-resistant latex or
nitrile gloves
Hard hat
Safety glasses
B Tyvek suit
Self-contained breathing
apparatus or supplied-air
respirator
Chemical-resistant latex or
nitrile gloves
Hard hat
Safety glasses
A
Encapsulating
chemicalprotective suit
Self-contained breathing
apparatus or supplied-air
respirator
Chemical-resistant latex or
nitrile gloves
Hard hat
Safety glasses
Note: a = Where the potential for heat stress exists, modified Level D may be downgraded to Level D if continuous monitoring verifies the absence of organic vapor.

Changes to these specified items of PPE will not be made without the approval of the SHSO.

The SHSO will have the authority to either upgrade or downgrade the level of PPE based on actual site conditions. If at any time there is a potential for increased chemical exposure, the appropriate upgrade of PPE will be required.
10 CONFINED SPACE ENTRY
Site work involves the excavation of large areas, which includes the operation of fuel-fired heavy equipment and possibly, workers performing tasks within the excavation. Ninyo & Moore and subcontractor workers will perform work under the direction of a Competent Person for excavations who will identify and control potential hazards including oxygen deficiency, toxic agent exposure, heat stress, and engulfment. Inspections will occur at least daily, prior to workers entering the excavation.
11 DECONTAMINATION
This section describes personnel, vehicle and equipment decontamination.

11.1 Personnel Decontamination
A minimal decontamination procedure (consisting of washing exposed skin with soap and water) shall be required at the site at the end of each workday and prior to eating, drinking or smoking.

11.2 Vehicle and Equipment Decontamination
The primary focus of any decontamination program is to minimize the spread of contaminated material beyond a given site. During field activities, vehicles and excavation equipment will be

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 19 used at the site. The level of potential contamination for vehicles and equipment at this site is low for support vehicles used in uncontaminated areas and/or for non-intrusive field activities, and medium for intrusive activities at potentially contaminated/contaminated locations. 12 MEDICAL SURVEILLANCE REQUIREMENTS
Site personnel, including subcontractors, directly involved with the field work must meet the medical surveillance requirements of 29 CFR 1910.120 and 8 CCR 5192. All site personnel will be required to participate in their employer’s medical surveillance program before being permitted to work on location. Contractors and subcontractors will be required to demonstrate, by document submittal, their maintenance of OSHA-compliant programs and to maintain records as required by the applicable contract.

Medical surveillance includes baseline medical examinations for field work certification and annual follow-up examinations. Special medical tests or examinations are not anticipated for personnel assigned to this project. The medical surveillance program is conducted under the guidance of an occupational medicine physician who established the medical exam protocol and certification requirements. Medical records of a confidential nature will be maintained by the medical provider or by each employer.
13 SITE CONTROL
Although potential chemical and physical hazards have been identified in this SHSP, if unexpected conditions arise, the SHSO will stop work at the site and notify the appropriate point of contact. Work will not resume until the SHSP and working conditions have been reevaluated and the SHSP revised accordingly.

13.1 Controlled Area Designation
At locations where field activities are taking place such as trenching and sampling, only authorized personnel with the proper training and PPE will be allowed to enter these active work areas which will include the operation of heavy equipment, and the potential for exposure to hazardous conditions/materials. In these areas, access may be controlled with caution tape and/or barricades.

13.2 Open Trenches
Trenches will be immediately backfilled after documenting subsurface conditions and sampling and will not be left open overnight.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 20 14 CONTINGENCY PLAN
In the event of an onsite emergency related to Project activities, the SHSO should notify the project CIH and dial “911,” as appropriate. In case of a medical emergency:
• Remove the exposed or injured person(s) from immediate danger. • Render first aid if necessary. Decontaminate affected personnel if necessary or obtain paramedic service or ambulance transport to the local hospital by calling 911. Another field personnel member will accompany any person to the medical facility and remain with the person until release or admittance is determined.
• If applicable, evacuate other personnel at the facility to a safe distance until the Fire Department determines that it is safe for work to resume. • Any accident/incident resulting in an OSHA-reportable injury or illness, treatment at a hospital or physician’s office, property damage, or a near-accident, requires that an accident/incident report be completed and submitted to the appropriate authorities.

The implementation of a spill contingency plan is not anticipated for this project. The planned field activities involve neither large quantities of materials nor the movement of containers of hazardous materials. For spills of less than one-half gallon, the subcontractor will respond by using rags or sorbent material and dispose of the sorbent material in a labeled container. When reporting a spill, the subcontractor will provide the following information:
• Worker name, organization, phone number, and location. • Number of injured personnel, if any, and nature of injuries if known. • Substance spilled.
• Source and cause of the spill.
• Approximate amount and extent of the spill.
• Approximate rate of release.
• Action taken so far.
• Approximate time spill occurred.
• Any other pertinent information asked by the operator. 15 EMERGENCY ACTION PLAN
In the event of a medical emergency or fire during activities at the project site, the standard “911” emergency telephone number shall be called from an on-site mobile phone. Field personnel have mobile telephones that they can use during site activities. Although unlikely,

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 21 during the daily tailgate meeting if field personnel indicate that they do not have a personal telephone, they will make it known and a telephone will be provided to them or they will work with someone that has an available telephone. A first aid kit and fire extinguisher will be located on site in a readily accessible location. The emergency facility for this project is Providence Queen of the Valley Medical Center. The hospital address is 1000 Trancas St 1st Floor, Napa, CA 94558.

Emergency Number Contact
Medical, Fire or Police 911 Emergency operator
Providence Queen of the Valley Medical
Center
1000 Trancas St 1st Floor, Napa, CA
94558
(707)252-4411 Emergency room
The route from the project site to the hospital is shown on Figure 1.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 22

CERTIFIED INDUSTRIAL HYGIENIST REVIEW
The above Site Specific Health & Safety Plan has been reviewed and approved by the certified industrial hygienist (CIH) indicated below.

Stephen J. Waide, CIH, CSP
Certified Industrial Hygienist No. CP 7005
Expires 6/1/22

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 Appendix A
Photographic FIGURE Documentation

Imagery ©2024 Airbus, Landsat / Copernicus, Maxar Technologies, Map data ©2024 Google 2000 ft Coombsville Rd & Pascale Place
Napa, CA 94559

1. Head northwest on Coombsville Rd toward Little St

2. Slight right onto CA-121 N/Silverado Trail

0.5 mi

2.0 mi
Coombsville Rd & Pascale Place, Napa, CA 94559 to Emergency Room at Providence Queen of the Drive 3.8 miles, 10 min Valley Medical Center, 1000 Trancas St 1st Floor, Napa, CA 94558 Go gle Maps t
1'

3. Turn left onto Monticello Rd

4. Continue onto Trancas St

5. Turn right

6. Turn right
Destination will be on the left
Emergency Room at Providence Queen of the Valley Medical Center
1000 Trancas St 1st Floor, Napa, CA 94558

0.1 mi

1.2 mi
259 ft
85 ft
t
r+
r+
•

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024

APPENDIX A
Site Health and Safety Plan Acknowledgement Form

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024

ONSITE WORKING PERSONNEL SIGN IN
The personnel listed below have 40-hour HAZWOPER or 24-hour training with current refresher status and have read and understood this Health and Safety plan, and agree to abide by its provisions.

Onsite Personnel
Name Signature Company Date

Ninyo & Moore | 360 West Grand Avenue, Escondido, California | 107538004 | July 31, 2017 5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 ARIZONA | CALIFORNIA | COLORADO | NEVADA | TEXAS | UTAH ninyoandmoore.com
Geotechnlcal & Environmental Sciences Consultants

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX E
Community Health and Safety Plan

Community Health and Safety Plan
Hidden Glen Dump
Coombsville Road
Napa, California
SWIS No. 28-AA-0028
Napa County Local Enforcement Agency
1195 Third Street, Suite 210 I Napa, California 94559
October 1, 2024 | Project No. 109558001
Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS Geotechnlcal & Environmental Sciences Consultants

Nathan Diem
Senior Geologist
Stephen J. Waide, CIH, CSP, CIEC, CMC
Principal Environmental Scientist
Community Health and Safety Plan
Hidden Glen Dump
Coombsville Road
Napa, California
SWIS No. 28-AA-0028
Mr. Peter Ex, REHS
Napa County Local Enforcement Agency
1195 Third Street, Suite 210 I Napa, California 94559
October 1, 2024 | Project No. 109558001
5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 | www.ninyoandmoore.com NDD/SJW/mp
Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS JVin90 & iV\oore Geotechnlcal & Environmental Sciences Consultants

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 i

CONTENTS
1 INTRODUCTION 3
2 SITE DESCRIPTION 3
3 PROPOSED PROJECT ACTIVITIES 4
4 SITE BACKGROUND AND HISTORY 4
5 EVALUATION OF POTENTIAL PUBLIC EXPOSURE TO
HAZARDS 7

5.1 Dust 8

5.2 Odors 8

5.3 Landfill Gases 8

5.3.1 Methane Gas 9

5.3.2 Hydrogen Sulfide 9

5.3.3 Vinyl Chloride 9

5.4 Metals 9

5.5 Petroleum Hydrocarbons 10

5.6 Semi-Volatile Organic Compounds 10

5.7 Organochlorine Pesticides 11

5.8 Polychlorinated Biphenyls 11
6 HAZARD MONITORING AND EQUIPMENT 12

6.1 Air Monitoring Procedures and Methodology 12

6.2 Action Levels for Perimeter Monitoring 13

6.3 Action Plan to Reduce Airborne Concentrations 14
7 CONTROL METHODS 14

7.1 Site Security 14

7.2 Dust and Debris Control 14

7.3 VOCs and Combustible Gases Control 15

7.4 Stockpiled Soil 15

7.5 Quality Assurance and Control Measures 15

7.6 Best Management Practices 15

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 ii 8 EMERGENCY PLANNING 16
9 PUBLIC NOTIFICATION 17
10 REFERENCES 18

FIGURES
Figure 1 – Site Location
Figure 2 – Site Plan

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 3 1 INTRODUCTION
This Master Community Health and Safety Plan (CHSP) provides measures to protect the public and surrounding land uses from potential health hazards during future on-site construction-related activities performed at the Hidden Glen Dump in Napa, California (site, Figure 1). This plan is intended to serve as a master document and shall be implemented during future construction related activities on the site that involve disturbing subsurface materials within or outlying the assumed waste footprint and at locations within approximately 1,000 feet outward from the assumed waste footprint.

A detailed project description, site map indicating the location of proposed work, a list of contact names and phone numbers, and a statement that this CHSP will be implemented during the proposed work will be prepared for each new project and submitted to the Napa County, Solid Waste Local Enforcement Agency (LEA) for their review and approval prior to conducting subsurface construction activities at the site.
2 SITE DESCRIPTION
The waste disposal site (WDS) is listed as “Hidden Glen Dump” in the CalRecycle Solid Waste Information System (SWIS) database and assigned SWIS No. 28-AA-0028. According to the database, the dump is listed as an unpermitted, closed, solid waste disposal site (WDS). The City-owned property referred to as “Parcel A” corresponds to a 2.18-acre area and is assigned Napa County Assessor Parcel Number (APN) 045-411-022-000 (Figure 2). The dump is located in a residential setting with wastes occurring at the previously capped portion of the dump, “buffer zone” and at adjacent residential properties downslope to the north, west, and south and generally upslope to the east. Adjacent residential properties are not separated by a road or other features. A cemetery is located across Pascale Place to the west.

The dump has three relatively recently constructed Landfill Gas (LFG) monitoring wells referred to as MW-1 through MW-3 (Figure 3). The wells were constructed in December 2020 and are monitored quarterly. The wells are dual and triple completions; MW-1 and MW-2 are constructed with screened intervals at 5 to 10 feet, 15 to 20 feet and 25 to 35 feet and MW-3 is constructed with two screened intervals at 5 to 10 feet and 15 to 20 feet.

Site: Hidden Glen Dump
Coombsville Road
Napa, California
(SWIS No. 28-AA-0028)
GIS Coordinates Latitude: 38.2977 Longitude: -122.2679

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 4 Land Owner City of Napa
955 School Street
Napa, California 94559
Site Health and To Be Determined by
Safety Manager (SHSM): General Contractor
Community Health
and Safety Manager
(CHSM): To Be Determined by the City
Oversight Agency: Napa County Solid Waste Program LEA
1195 Third Street, Suite 210
Napa, California 94559
Contact: Mr. Peter Ex
(707) 253-4419
3 PROPOSED PROJECT ACTIVITIES
Future work at the site that would require implementation of this plan includes construction-related activities that involve disturbing the subsurface materials at the site including but not limited to grading, subsurface excavation/trenching activities associated with maintenance/repairs or new construction.

Prior to conducting subsurface construction activities at the site, the following should be submitted to the LEA for their review and approval:
• a detailed project description,
• site map indicating the location of proposed work,
• the name and contact information for the contractor or agency performing the work, SHSM, and the CHSM, and
• a statement that this CHSP will be implemented during the proposed work. 4 SITE BACKGROUND AND HISTORY
Initially the dump was an excavated quarry that operated into the 1940s. Reportedly, groundwater was encountered when the quarrying operations reached at a depth of about 70 to 80 feet (below ground surface (bgs). However, reportedly subsequent subsurface investigations as summarized in the McClaren-Hart (1990) Closure Plan indicated that based on borings advanced within the waste disposal pit area, the waste thicknesses range from approximately 5 to 24 feet with an average depth of 20 feet. Reportedly, the quarry was abandoned due to the presence of groundwater. Sometime after quarry operations ended, the excavation was used as

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 5 a general garbage dump by a private operator. Reportedly, “garbage” was dumped and then burned “and spread as a landfill.” It was stated that it was possible that “old” automobiles from a local demolition derby were also abandoned at the dump. In the early l960's, the dump reportedly was abandoned when the South County landfill became operational. The City reportedly began using the Hidden Glen Dump to dispose tree prunings and brush, along with asphalt and concrete wastes. The brush and prunings were reportedly burned “and spread.” Several closure plans (aka remedial action plans) were previously prepared for the dump and remedial action activities were conducted to close the site. ENGEO (1988) prepared a closure plan consisting of capping the waste disposal site “in place.” In 1990, Harding Lawson Associates (HLA) (1990) prepared an addendum to the closure plan that maintained the planned “in-place capping” of the dump. In April 2000 McClaren-Hart prepared a Closure Plan for the Hidden Glen Dump (McClaren-Hart, Inc, 2000) that was generally consistent with the previous 1988 ENGEO and 1990 HLA closure plans and similarly proposing capping the waste disposal site “…in place and dedicating the site as open space as part of a planned residential development of the surrounding site.” The closure plan proposed to cap in place the dump and reportedly “…gain agency concurrence for closure, which is sought by the land owner to allow him to proceed with planned residential development of the overall 14-acre site.” Reportedly the 1990 McClaren-Hart Closure Plan report was prepared as an addendum to the 1988 Closure Plan.

In general, the McClarren-Hart Closure Plan described methods proposed to cap in place the dump and obtain regulatory agency concurrence for closure which was being sought by the land owner to allow them to proceed with the planned residential development of the overall 14-acre site, a portion of which included the dump. Post closure activities were indicated as consisting of a 5-year cap and methane monitoring program even though methane was not expected to be encountered at levels of environmental concern.

In June 2000 Harding Lawson conducted surface sampling, followed by HSI GeoTrans (GeoTrans) performing follow up soil sampling in November 3, 2000 “…to further revaluate lead concentrations in surface soil outside the perimeter of the landfill.” GeoTrans stated that the purpose of the “follow-up soil sampling” was to further evaluate concentrations of lead in surface “soils” at three proposed parcels (7, 10 and 11) reportedly related to initial screening level “soil” sampling performed in June 2000 that indicated lead concentrations in “surface soil” above 200 ppm at each of these three parcels. Both of the investigations indicated elevated lead concentrations (greater than 200 parts per million [ppm] lead) at locations outlying the assumed waste disposal area/proposed area to be capped.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 6 Geotrans (Geotrans) stated that while excavating the western "debris field" a “trench feature” filled with “landfilled debris” was discovered. It was reported that the “trench” extended up to approximately 10 feet deep, and measured approximately 15 feet in width and 60 feet in length. Geotrans indicated that the material from this “trench area” was excavated to a bedrock base and placed into the interior of the landfill. Geotrans proposed to collect five confirmation samples of “rock material” across the base of the excavated area to verify that there is no impact in this area, and to allow this area to be considered "clean" and “outside the perimeter of the landfill.” Geotrans stated that this area is slated to be an easement area for access to the future closed waste disposal site and will not be within a proposed parcel or lot.

In January 2002, Geotrans submitted a documentation report of the waste cap construction on behalf of the Napa Garbage Service that included as-built drawings, liner test results, compaction test results, site photographs, and a description of the work performed. It was stated that the “landfill” cap was constructed in accordance with the design specifications and closure plan requirements. Geotrans stated that the closure was performed with oversight and direction from the Water Board, CIWMB and the LEA and in general accordance with the April 6, 2000 closure plan prepared by McLaren/Hart, Inc. titled, “Closure Plan, Hidden Glen Landfill, Napa, California” as amended by the December 6, 2000 letter prepared by Geotrans titled, “Addendum to April 6, 2000 Hidden Glenn Landfill Closure Plan, Napa, California.” GeoTrans stated that the construction documentation report indicated that “landfill closure” included importing and stockpiling clean fill material for use as foundation fill and protective soil cover; clearing and grubbing the waste area surface; placing and grading foundation fill soils over the waste materials; installing a cap system consisting of a geosynthetic clay liner (GCL), 80-mil high density polyethylene (HDPE ) layer, and geocomposite drainage layer; placing protective soils and top soil over the cap; placing a hydroseed mixture on the topsoil; and installing surface water drainage and erosion control features.

Landfill closure activities were reported as being conducted from June 28 to November 28, 2001.

The closure report (aka remedial action) appears to have provided the required documentation and supporting information pertaining to the activities conducted at the dump related to constructing the waste cap. The closure report in conjunction with other documents also provided information about the removal of wastes outlying the cap at two “debris fields” (one being the waste trench) previously located on three lots (6, 9 and 10) and four areas of lead impacted “soils” on three lots (7, 10 and 11) and the on-site reconsolidation of these materials in the capped area. Furthermore, t was stated that the results were communicated to regulatory agency staff that concurred “no further action was required.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 7 Beginning in September 2018, Langan conducted subsurface site investigations (drilling and sampling) of residential properties at Lots 6, 7, 8, 9 and 10, outlying the capped portion of the Hidden Glen Dump. Langan indicated that the purpose of their investigations was to collect “subsurface information” to develop a plan for remedial action “to address debris impacts in shallow soil on the five lots and, if needed, on adjacent areas between the lots and the landfill footprint.” Results of their investigations indicated the presence of relatively shallow wastes extending onto the residential properties. These wastes contain elevated lead concentrations at some locations. The results of their investigations indicate that the lateral extent of the waste disposal site extends beyond the area that was capped.
5 EVALUATION OF POTENTIAL PUBLIC EXPOSURE TO HAZARDS
During construction activities, care must be taken to protect surrounding receptors, such as the adjacent residential properties. Community exposures to hazards from site activities and/or releases that may migrate to human and environmental off-site receptors will be minimized.

Future project activities that would require implementation of this plan include construction-related activities that disturb the subsurface environment, which includes, but is not limited to, grading, subsurface excavation/trenching activities associated with maintenance/repairs or new construction, and other subsurface disturbances at and/or within approximately 1,000 feet from the waste footprint boundary.

Future construction work may be conducted within or in close proximity to the assumed waste footprint and areas of potential human health and environmental impact from the buried waste include the site and off-site areas approximately 1,000 feet outward of the assumed waste footprint. There is potential for encountering landfill wastes if construction activities are within the assumed waste footprint. There is also potential to encounter LFG during future construction activities within or outlying the assumed waste footprint; however, based on the active LFG extraction system operating at the site, there is a low likelihood of encountering high concentrations of LFG in areas outlying the waste footprint, but high concentrations of landfill gas could be encountered in areas located within the waste footprint. The potential public hazards and nuisances from future subsurface construction activities include:
• organic vapors,
• landfill gases,
• airborne contaminant particles and dust, and
• odors.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 8 Based on historical records elevated lead and total petroleum hydrocarbons (TPH) concentrations were detected at the dump site and on adjacent properties. Other constituents of potential concern (COPCs) include landfill gas, metals, total petroleum hydrocarbons (TPH), polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), and volatile and semi-volatile organic compounds (VOCs and SVOCs, respectively). PCBs, OCPs, VOCs and SVOCs were detected in soil samples at concentrations below their respective Region Water Quality Control Boards Environmental Screening Levels and may be present at the site.

Chemical characteristics of the constituents of potential concern are described in the following sections. Although not directly relevant to community exposure, occupational exposure limits, where available, are given for informational purposes and, if measured at the source, would be protective of the community. The perimeter monitoring, action levels, and the required notifications and control measures, if action levels are exceeded, are described in further detail in the following sections.

For the purposes of this CHSP, the monitoring points of compliance will be along the perimeter of the active work area, unless otherwise determined by the CHSM, or designee, based on actual site conditions and activities. The CHSM will be a Certified Industrial Hygienist.

5.1 Dust
Material removal, stockpiling of bulk soil and other materials, handling of potentially contaminated soil or other items, and general excavation and grading can generate airborne dust that can become a nuisance or a hazard to nearby sensitive receptors. In addition, certain contaminants can adhere or adsorb to various particles in dust, resulting in potential offsite impacts. Visible dust will be monitored and controlled at the site by the Contractor. The Project Environmental Consultant will monitor dust at the site perimeter during soil disturbance activities, if indications of possible contamination are encountered.

5.2 Odors
If landfill wastes are encountered, odors may be present as a result of degradation of buried organic wastes in the landfill. Odor monitoring by qualitative (olfactory) and semi-quantitative (photoionization detector [PID]) methods and by LFG monitoring will be performed to identify potential odor issues.

5.3 Landfill Gases
Because of the possibility of decomposition of organic materials buried at the site (e.g., municipal solid waste), a discussion of landfill gases is necessary. Decomposition of organic

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 9 material results in the production of several gases that may present a safety and health concern.

5.3.1 Methane Gas
Methane gas has been monitored at the site since December 2020 and is currently monitored on a quarterly basis. Methane monitoring results have been below regulatory limits during all monitoring events. Methane gas may be encountered during excavation activities. Methane is odorless and non-toxic, but can present an explosive hazard in high concentrations, can act as a simple asphyxiant (can displace oxygen) in low-lying areas or confined spaces, and may be an indicator of the presence of other potentially hazardous landfill gases. Methane will continue to be monitored as an explosive gas.

5.3.2 Hydrogen Sulfide
Hydrogen sulfide (H2S) is a colorless, heavier-than-air gas with a characteristic odor. (Note that desensitization can occur, i.e., the inability to “smell” the odor, resulting in increased danger of overexposure.) H2S is commonly found at landfills as a result of waste decomposition. It can be toxic or fatal if inhaled in high concentrations.

5.3.3 Vinyl Chloride
Vinyl chloride results from the decomposition of chlorinated materials such as plastics and solvents. Vinyl chloride is a recognized human carcinogen. The Occupational Safety and Health Administration (OSHA) standard for vinyl chloride (to occupational workers) established an exposure limit of 1 ppm as a time-weighted average (TWA) and 5 ppm as a short-term exposure limit (i.e., 15 minutes). The action levels established for this site are designed to adequately protect the public from fugitive emission of this toxic gas. In the unlikely event that site conditions indicate the need to monitor worker exposures to vinyl chloride, perimeter monitoring will be initiated. The CHSM will determine the type and frequency of monitoring based on site conditions.

5.4 Metals
Elevated concentrations of lead at the site have been documented during previous site assessments activities. Although metal and metal ions do not present volatility or flammability problems, they can present acute and chronic effects if the host material is inhaled in the form of dust or fumes. Metal ions can cause irritation of mucous membranes and lung tissues and some metals such as lead are suspected carcinogens. Public exposure to metals in the burned waste

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 10 and soil by dermal contact or ingestion is not likely. Therefore, this plan addresses potential exposure by inhalation of dust containing metals generated by site activities.

Lead is the primary metal of concern. It is a toxic heavy metal and a suspected carcinogen that may be encountered in inorganic or organic forms. The Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL)- time weighted average (TWA) for lead in air is 0.05 milligram per cubic meter (mg/m3). Visible dust will be monitored and controlled during construction activities as described in Section 7.

5.5 Petroleum Hydrocarbons
TPHmo and TPHd were detected in soil samples in adjacent properties (Langan, 2019). TPH is a term used to describe a large family of several hundred chemical compounds that originally come from crude oil. TPH is a mixture of chemicals, but they are all made mainly from hydrocarbons.

Some chemicals that may be found in TPH are hexane, jet fuels, mineral oils, benzene, toluene, xylenes, naphthalene, and fluorene, as well as other petroleum products and gasoline components.

Some of the TPH compounds can affect your central nervous system. One compound can cause headaches and dizziness at high levels in the air. Another compound can cause a nerve disorder called "peripheral neuropathy," consisting of numbness in the feet and legs. Other TPH compounds can cause effects on the blood, immune system, lungs, skin, and eyes.

Animal studies have shown effects on the lungs, central nervous system, liver, and kidney from exposure to TPH compounds. Some TPH compounds have also been shown to affect reproduction and the developing fetus in animals. The International Agency for Research on Cancer (IARC) has determined that one TPH compound (benzene) is carcinogenic to humans.

IARC has determined that other TPH compounds (benzo[a]pyrene and gasoline) are probably and possibly carcinogenic to humans. Most of the other TPH compounds are considered not to be classifiable by IARC.

5.6 Semi-Volatile Organic Compounds
Semi-volatile organic compounds (SVOC) have been detected in soil samples below regulatory screening levels from adjacent properties and include bis (2-ethylhexyl), phthalate, and pyrene (Langan, 2019). Although SVOCs have not been detected at elevated concentrations, SVOCs may be encountered during excavation actives and for the purpose of this CHSP, hazards are explained below.

SVOCs area organic compound which have a boiling point higher than water and which may vaporize when exposed to conditions above room temperature. Significant airborne levels of

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 11 SVOCs are not typical during fieldwork however they can be present in airborne dust. SVOCs include phenols and PAHs. Short-term effects of phenol exposure include respiratory irritation, headaches, and burning eyes. Chronic effects of high exposures include weakness, muscle pain, anorexia, weight loss, and fatigue; effects of long-term low-level exposures include increases in respiratory cancer, heart disease, and effects on the immune system. PAHs are produced from coal tar and other sources and are used in a variety of industrial products. PAH is a recognized human carcinogen. Studies in animals have also shown that PAHs can cause harmful effects on skin, body fluids, and the body's system for fighting disease after both shortand long-term exposure; however, these effects have not been reported in people. The current OSHA PEL is 0.2 milligrams per cubic meter (mg/m3
); however, exposure by any route to PAH
and other recognized human carcinogens will be maintained at the absolute practicable minimum level. Exposure to SVOCs are expected to be adequately controlled with the designated action levels for airborne vapor and dust.

5.7 Organochlorine Pesticides
OCPs were detected in soil samples below regulatory screening levels in adjacent properties and include endosulfan, p,p-DDD, p,p-DDE, and p,p-DDT, aldrin, alpha- BHC, and dieldrin (Langan, 2019). As with PAHs above, action levels for lead and total dust will serve to keep exposure to OCPs well below recognized exposure limits and should eliminate offsite impacts.

5.8 Polychlorinated Biphenyls
PCBs have been detected in soil samples below regulatory screening levels. Although PCBs are not expected at elevated concentrations, for the purposes of this CHSP, hazards are described below.

PCBs, also referred to as aroclors, are synthetic industrial products which have been commonly used as cooling fluid and for electrical insulation. PCBs are common contaminants of oily type waste and are found around railroad tracks and in industrial areas and dumps. PCBs are recognized environmental pollutants and suspected human carcinogens.

The United States Environmental Protection Agency (EPA) currently classifies PCBs as a Class B2, or probable, human carcinogen. Skin exposure may contribute significantly to uptake of these chemicals, and therefore all skin exposure should be strictly avoided. Work involving exposure to PCBs above the atmospheric action level or in contact materials exceeding 100 micrograms per gram may require special medical evaluation and approval of the SHSO.

PCBs are not volatile and exposure will be controlled by limiting airborne dust.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 12 6 HAZARD MONITORING AND EQUIPMENT
If, odors, or other indications of possible contamination are observed, hand-held, direct-reading (real-time) instruments will be used to monitor air for VOCs, combustible gases, and/or dust at the site perimeter. Air monitoring will not be performed if odors or other indicators of contamination are not present.

The dust monitoring program will consist of the following activities: 1) monitoring for the presence of visible dust generated during earth moving activities; 2) if dust is observed, notify the contractor and request that dust be reduced/eliminated by appropriate engineering controls (e.g., application of water via hose, water truck, etc.); 3) use a portable monitoring instrument to measure total dust levels at the downwind perimeter of the site at an appropriate sampling frequency (e.g., approximately every half hour); and 4) document dust monitor readings, including date, time, and location of each measurement.

VOCs and LEL monitoring will be performed at the site perimeter during earthwork activities.

The monitoring equipment will consist of a direct-reading instrument for VOCs using a photoionization detector and combustible gases using a 4-gas meter, as applicable. Calibration of the instruments will be performed in accordance with the manufacturer’s specifications. If VOCs or LEL are detected above the action levels indicated in Section 6.2 of this plan engineering controls will be implemented to mitigate vapors and gases. Readings will be collected and documented similarly to the dust readings as described above.

6.1 Air Monitoring Procedures and Methodology
The Project Environmental Consultant will use aerosol monitoring equipment to monitor total dust at the work site perimeter and direct-reading instrument for VOCs and combustible gases.

The monitoring locations will be determined by the Project Environmental Consultant based on prevailing wind, project activities, and potential sensitive receptors. Air monitoring readings will be documented at approximately 30-minute intervals, unless modified by the Project Environmental Consultant.

A MiniRAM or other aerosol monitor that measures total airborne dust will be used to comply with the action level indicated below. A photoionization detector will be used to measure VOCs and a 4-gas meter will be used to measure combustible gases. Field personnel trained in proper calibration, use, and maintenance will calibrate equipment in accordance with the manufacturer’s specifications.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 13 Instrument readings collected for monitoring purposes will be recorded in a daily log by the Project Environmental Consultant. The log will include, at a minimum:
• Diagram indicating site boundaries, the areas of material disturbance, and the perimeter monitoring locations.
• Direct reading instruments listed above, including equipment make and model, serial number, and calibration record.
• Table of direct reading results including collection time and collection location. • Weather observations including time, wind direction, wind speed, temperature, and precipitation. • Other conditions or circumstances that may influence instrument readings.

When downwind direction cannot be determined or if wind direction varies throughout the day, the onsite Project Environmental Consultant personnel will use their best judgment to determine appropriate perimeter monitoring locations.

6.2 Action Levels for Perimeter Monitoring
The action level for air monitoring will be any visible dust or 1 milligram per cubic meter (mg/m3) measured with an aerosol monitor as measured at the site perimeter.

The action level for VOC and combustible gas monitoring will be greater than 2 parts per million (ppm) for VOCs sustained for over two minutes at the immediate work area perimeter or 10% LEL for combustible gases at the work activity.

The monitoring action levels for the site are provided in Table 1.

Table 1 – Direct Reading or Quantitative Sampling and Analysis Constituent Work Area Perimeter Action Level
Airborne dust Visible dust or 1 mg/m3 as measured with real-time instrument Total VOCs 2 ppm over background, sustained over 2 minutes Methane 10% of LEL at work activity
H2S 10 ppm at work activity
CO 10 ppm
Oxygen concentration (O2) < 19.5% O2 or > 22.0% O2
Notes:

LEL = lower explosive limit
mg/m3 = milligram per cubic meter
ug/m3 = microgram per cubic meter
Field personnel trained in proper calibration, use, and maintenance will calibrate direct air monitoring equipment in accordance with the manufacturer’s specifications.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 14

6.3 Action Plan to Reduce Airborne Concentrations
If the action level in Table 1 is exceeded, project activities will immediately cease until engineering controls are implemented to reduce airborne concentrations to below the action levels. Engineering controls and best management practices discussed in Section 5 of this document may be used by the Contractor to prevent exposure to the public; however, it will be the Contractor’s responsibility to select and provide effective dust suppression controls.

If the Contractor’s engineering controls fail to reduce airborne concentrations to below the action level, the Project Environmental Consultant will notify the District and request that work stop until options for effective controls to protect the community are evaluated and implemented. 7 CONTROL METHODS
Administrative and engineering controls will be implemented by the Contractor to prevent or minimize public exposure to potential hazards created by field activities. Control methods to reduce public access, prevent or minimize dust, and reduce noise and other physical hazards will be used. If other contamination hazards are observed by the Contractor during the course of work, the Project Environmental Consultant will be notified and appropriate assessments performed.

7.1 Site Security
Controlled areas will be established by the Contractor prior to commencement of construction activities at the site, using fencing or barricades. Only authorized personnel, with the proper training and personal protective equipment, will be allowed to enter any work area boundaries after they agree to abide by the provisions of the Contractor’s site-specific worker HSP, and are informed of potential dangers that could be encountered while onsite. Site workers will also be briefed on the requirements of this plan, where necessary for implementation. Work areas will be surrounded by construction fencing and pedestrian barricades and will be securely locked at the end of each work day to prevent unauthorized entry.

7.2 Dust and Debris Control
Soil-intrusive activities will likely generate airborne dust. Under certain atmospheric conditions, this dust may become a nuisance or a hazard to nearby sensitive receptors such as residential communities. Site personnel will visually monitor airborne dust and, if impacted soils/materials, the Project Environmental Consultant will document the results of perimeter monitoring during work in those areas. During activities that may create large quantities of dust, such as excavation and loading of trucks, implementation of strict dust control (e.g., watering or procedural change) will be undertaken by the Contractor. The Contractor will generally mitigate dust with water, applied by

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 15 water trucks or hoses, in the active work areas. Best management practices to control run-on or run-off from the site will be used by the Contractor to ensure that contaminants not leave the site during storms or excessive water application.

Trucks carrying waste shall be enclosed such that there is no dust or odor during transportation along the haul route. Open trucks that may produce dust during transport will not be permitted to haul waste from the site.

7.3 VOCs and Combustible Gases Control
If VOCs or combustible gases are detected above the action levels at the site perimeter, work shall be stopped, the source of vapors and/or combustible gases shall be assessed and proper ventilation or vapor mitigation measures will be implemented. If mitigation measures fail to reduce airborne concentrations to below the action levels, the activity causing the exceedance will stop, the area will be secured and the City of Napa will be notified.

7.4 Stockpiled Soil
Soil stockpiles shall be maintained by the Contractor according to project plans, specifications, and Storm Water Pollution Prevention Plan (SWPPP), and all local, state, and federal regulations and requirements. Soil stockpiling procedures are detailed in the Remedial Action Plan develop by Ninyo & Moore concurrent with this CHSP.

7.5 Quality Assurance and Control Measures
Quality control and assurance measures will be implemented to ensure proper calibration of instrumentation, to document the use of appropriate sample collection and handling procedures, and to assess whether additional air monitoring and sampling is necessary.

All real-time instrumentation will be calibrated according to the manufacturer’s specifications prior to use each day. A record of this calibration will be logged on an appropriate form and will include: equipment manufacturer and model, serial number, factory calibration date and time, methodology, and results of the daily field calibration.

7.6 Best Management Practices
To minimize or prevent the discharge of contaminated or potentially contaminated materials from the subject site, best management practices will be implemented by the Contractor, and all local, state, and federal regulations regarding the handling, storage, transportation, and disposal of contaminated or potentially contaminated materials will be adhered to.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 16 Vehicles entering and/or exiting the site for loading of wastes and contaminated material slated for disposal shall be tracked by the Contractor through documentation and decontaminated (where applicable), prior to their departure from the site. Care shall be exercised to avoid spillage of contaminated materials from vehicles leaving the site.

In addition, the Contractor will contain, collect, treat, detain, test, and release site storm water and/or groundwater as required by the SWPPP, National Pollutant Discharge Elimination System (NPDES), and project plans and specifications.
8 EMERGENCY PLANNING
In the event of an emergency or unauthorized release of a hazardous substance or waste, the following actions will be taken:

In the event of a release that causes a sudden hazard to life or the environment, the Contractor’s Site Health and Safety Manager (SHSM) must be immediately contacted and informed of the health and/or environmental risk. These individuals have the knowledge and integrated authorities to cease any activity or condition contributing to the hazard.

The Contractor’s SHSM is also responsible for notifying the appropriate emergency response agencies and the District. The Contractor’s SHSM will be determined prior to commencement of construction activities, and the applicable contact names and numbers will be posted to report any hazards at the project site.

Other required actions include:
• Stop work activities, as necessary;
• Lower background noise to speed communication;
• Notify other site personnel;
• Begin emergency procedures as mentioned below; and
• Immediately contain the source and spread of the release per OSHA Hazardous Waste Operations and Emergency Response training.

If an injury or illness occurs:
• Get first aid for the injured person(s) immediately;
• Obtain professional medical attention if injury is serious; and • Notify the Contractor’s SHSO.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 17 Rescue and response actions should be decided and the necessary steps implemented. No one should attempt emergency rescue until qualified personnel and evacuation routes have been identified.

Following are local emergency telephone numbers:

GENERAL 911
FIRE Napa County Fire Department 911 or (707) 253-4940
HOSPITAL Providence Queen of the Valley Medical Center 911 or (707) 252-4411 POLICE City of Napa Police Department 911 or (707) 257-9223 9 PUBLIC NOTIFICATION
This Public Notice and Proposition 65 Warning are intended to advise the neighboring community of the planned activities. Prior to the initiation of project activities, the CHSP will be reviewed and approved by the LEA. Signs will be posted at the project entrance that provides the following:
• Project name;
• Project commencement and expected completion dates;
• Project-specific warnings,
• Any required Proposition 65 warnings; and
• Emergency contact information

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 18 10 REFERENCES
Engeo, 1988, Geotechnical Exploration, Hidden Glenn – Fennell Property, Napa, California:
dated March 2.

Kunkel, F., and Upson, 1960, Geology and Groundwater in the Napa and Sonoma Valley areas.

U.S.G.S. Water Supply Paper 1495.

McClaren-Hart, Inc, 2000, Closure Plan Hidden Glen Landfill, Napa, California: dated April 6.

SCS Engineers, 2020, Property Management Plan for City-Owned Parcel (APN 045-411-022- 000), Investigation and Clean-Up of Closed Hidden Glen Landfill, Napa, California: dated March 2.

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 Appendix A
Photographic Documentatio FIGURES n

" SITE
1_109558001_SL.mxd 9/3/2024 JDL
NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCE: ESRI WORLD TOPO, 2024

SITE LOCATION
o
! 0 1,500 3,000
FEET
FIGURE 1
UV128
UV29
UV128
UV29
UV12
UV121

MAP INDEX
Napa
County
109558001 | 9/24

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
" ~
,.,,
iii
f
0 (lj
,,o,
,::'?
~
~
Geotechnlcal & Environmental Sciences Consultants
t-1'9 .ird Or
"' 1/) ,. s r,ng 'L'.
? "'
a
,490fl
pr'i d}
0 j/
r,
~ Iii
Per.i.1-,oya l St
Republc Av
Lo nJon Way
.. ,.
<[ a::
::::
~
E
II) .;
~ c I...Jred St 1 ~ C
a:: _, < >,
C §
.9 ., ;; a.

@?&
@?& @?&
175
165
155
145
135
185
115
135
1 2
5 105
95 105
125
MW-3
MW-2 MW-1
LEGEND

PASCALE PLACE
@?& LANDFILL GAS WELL (SCS ENGINEERS, 2020)
MW-3
2_109558001_SP.mxd 9/3/2024 JDL NOTE: DIRECTIONS, DIMENSIONS AND LOCATIONS ARE APPROXIMATE. | SOURCES: SITE PLAN - SCS ENGINEERS, DATED: 2-26-20; TOPO - NOAA/USGS LIDARNOAA LIDAR, 2018-2019, NORTHERN CALIFORNIA WILDFIRE-QL2; GOOGLE EARTH, 2024

HIDDEN GLEN DUMP

COOMBSVILLE ROAD, NAPA, CALIFORNIA
109558001 | 9/24
o

SITE PLAN
FIGURE 2
050 100
FEET
FLAG

SECTION
LOT 6
LOT 5
LOT 9
LOT 10
LOT 11
LOT 12
LOT 13

GLORY COURT
PARCEL A BOUNDARY APN: 045-411-022-000(SCS ENGINEERS, 2020) @
@

PARCEL BOUNDARYAPPROXIMATE LIMIT OF CAP
ADAPTED FROM LANGAN (2018)
LOT 7
LOT 8
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
"
APPROXIMATE "BUFFER ZONE"

ASSUMED TO BE THE AREA

BETWEEN THE WASTE CAP

AND ADJACENT RESIDENTIAL

PROPERTIES / LOTS
"
JVin90& J\'\Oore
Geotechnical & Environmental Sciences Consultants
;
I
I
I
I
\
\
\
\
;
,,-... ,,,"'
----
\
\
\
\
\
\
I
I
D

ATTACHMENT 4
Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 1, 2024 5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 ARIZONA | CALIFORNIA | COLORADO | NEVADA | TEXAS | UTAH ninyoandmoore.com
Geotechnlcal & Environmental Sciences Consultants

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX F
Alternative Acceptance of Neighboring Property Waste
Soil Grading Plans

RELOCATED SOIL WITH WASTE (TOTAL STOCKPILE DEBRIS = 2,753 CY)

SECTION CUT
EXISTING CONTOUR: 1'-0" INTERVAL TYP.

PROPOSED CONTOUR: 1'-0" INTERVAL TYP.

GRADING AND DRAINAGE NOTES

1. GRADING AND DRAINAGE: ALL PROPOSED PAVING, CURBS, WALLS, AND PLANTING AREAS SHALL SMOOTHLY CONFORM TO EXISTING ADJACENT FEATURES TO REMAIN. PROVIDE POSITIVE DRAINAGE ON ALL PAVING AND THROUGHOUT ALL PLANTING AREAS.

2. SOIL STOCKPILE: STRIP AND STOCKPILE EXISTING 6" LAYER OF SOIL FROM AREAS DISTURBED DURING GRADING OR EXCAVATION.

3. GRADING: CONTRACTOR SHALL PERFORM ALL EARTHWORK AND GRADING PER GEOTECHNICAL ENGINEER'S RECOMMENDATIONS.

4. LANDFILL CAP PROTECTION: REFER TO SPECIAL PROVISIONS SECTION 00 72 00 GENERAL REQUIREMENTS, SECTION 1.3.C FOR LANDFILL CAP PROTECTION REQUIREMENTS.

X
XX
XX

PASCALE PLACE
SD
SD
PGE
PG&E
SL

PASCALE PLACE
SD
SD
PGE
PG&E
SL
127
126
125
128
125
126
127
129
130
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
131
132
133 134 135 136 137 138 139
135
134
133
132
131
130
136
129
128
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
107 108
1 5.1
2 5.1
3 5.1 t:\Projects\2017 projects\17058_hiddenglenpark\3_constructiondocuments\CutFill\A17058_GD_Accept all Debris.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

Callander Associates
Landscape Architecture
RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024
1 5.0
A17058_GD_Accept all Debris.dwg

GRADING PLAN
0 20 feet
1" = 20'
40 NORTH
2 HIDDEN GLEN DUMP REMEDIATION- ALL WASTE
1 5.0

EROSION CONTROL PLAN

STOCKPILE AREA
LOT 8
I
I
LOT 7
LOT 6
<,;
, ..
\ ~
I J- v
I
LOT 5 l
~
l
~ I ...,
;J;
~
£ \J
u..
0 I- - ~ .,,.~
..J
-D D
--
®
J
...,
~
N
I
/
/
/ ~ ...,
<' "' \:;
/\
I
'r
§I +
''29.J.2
~ ';
I 'l ii I tiQ
~o S7;.
'#o
..J ' . ~
• -ill!
N
m "' m
/
/
/
rI
I
I ~
I ...,
' "'
~
' ' I
' ~ ' I N
\D
m
' ..., ' \
\

PA CALE
\
...,
N
~
.
• .., '
.,...
m "'
~
•
•
~ N -;.,
m
: ,!»
.. ~-. -~
,a,.
. ..,.
•
•
LACE
. .
. . .
•
. . .
...
...
................ ..................... "
.......
........ .. . . . . . . . . . " " .. . . . .
. . . . ... . . . .. ... ···· .. • .. • ~ -~· ~--·~······. .. ~ •• rt . ....... . ..................... r1a••····· ·····""···••'o,••····
• • .. • • • • • C>
. . .. . . . . . . ···••IJ'l••····· " ..... ••••li"'--•x••• •• •••• ,19 ........... . ",.9i',. • • • • • •" • • • • • •" • 1/1.x •
........... """"""""'-'~ " . . . . . ....... " . . . . . . . . . . . . . . . . . . . .... a ...... ••••••••• ..
. . • • • • • • • • • • • • • • •·_::_;.a•s•- -·
:: ~ .. "··"~:···· . .... .. " . .. " .
~- .. . .. w .. .
··~··· •••CID•••••
• • • ...i • ••••
.........
. ..... . . .
" . .. " . . ...... . ~"".
,t.,J: " ••
,.i;:v" ••
..
..

UPLAND AREA
•
• •
•
• •
•
•
-
•
•
....
.....
• JI ••
-~·
• C, . •
. ,.___
•
. ... . . ... . . .. . . ... . .... . .
. .
. .
...
. .. " ...... " .. ... • • • • L" • " ..... at-Jr, •••
.................. '-· . ••••••••"• """"""""";..,.. .. ,.- • .... • ':Q ••• " • • • • • • " • ' • • • • • • • • • M • " • • . ... ·~· . .... .
' .... .,.. .. . • • • • • .. • • .. • .. • • • • • • ...... • -it ... . ............... ~ ~ •••••• • ':t, • ••
•••••••••••~~••••••••••O
. ............ ~········~:4
••:!.•• .. ···~~-········ .. ••• "" ••1Lt"•--·- ~···········--·· •• 'I'"'!! - -- • ... • "9 .... ...
. ..
"'
0 UTILITIES DEPARTMENT
I
I
,:;
~ -0
-0
• ,;;,
m
-
~
N
•
T"""
T"""
lo
....J
C\I
T"""
I0
....J
('t)
T"""
I0
....J
GRADING AND DRAINAGE LEGEND ...............
. . . . . . . . . . . . . . .

LOT 8
LOT 7
LOT 6
APPROXlfl.A,EU,1~
OF LANDflJ. CAP
LOT 5 I
~
I l
1 •
J
APPROKIMAlE JWl
0 ' l.ANDfLL C-.P
\
)
EXlSIINGFENCE
FOR EROSION CONTROL DETAILS SEE SHEET 3.1

UPLAND AREA
APPROXl'NI!\ LIMI!
OF lANDFlJ. C._P
. .
'
•
•
LO 0
~ I
I
;
I
PROXIMATE l lMfl II Dl'llL CA?
I
\
\
\
•
121.50 Tr'lx;t::Jrv Po'nt Drive
Ciolld Riv~" CA:- g,5;;70
T 9 'I 6"9R-:iJ:.J,S6
I'
I
I
/
Jeer
"
'
~
~
I0
__J
N
~
I0
__J
lo
__J
'
"

LOT 12
130'
140'
135'
145'
125'
150'
155'
120'
115'
-230' -225' -220' -215' -210' -205' -200' -195' -190' -185' -180' -175' -170' -165' -160' -155' -150' -145' -140' -135' -130' -125' -120' -115' -110' -105' -100' -95' -85'-90' -80' -75' -65'-70' -60' -55' -45'-50' -40' -35' -25'-30' -20' -15' -10' -5' 0' 5'

APPROXIMATE LIMIT OF LANDFILL CAP

PROPERTY LINE
EX. GEOCOMPOSITE DRAINAGE NET &

POLYETHYLENE MEMBRANE
EX. GRADE
EX. TOP SOIL
EX. WASTE
EX. FOUNDATION FILL (18" MIN.)

SOIL WITH WASTE FILL, SEE

WASTE EXCAVATION PLAN
135'
145'
140'
150'
130'
155'
LOT 6
125'
120'
0' 5' 10' 15' 20' 25' 30' 40'35' 45' 50' 55' 65'60' 70' 85'80' 90' 95' 105'100' 110' 115' 125'120' 130' 135' 145'140' 150' 155' 165'160' 170' 175' 180' 185' 190' 195' 205'200' 210' 215' 225'220' 230' 235' 240' 245' 250' 255' 260' 265' 270' 275' 280' 290' 295' 285' 300' 305' 310' 315' 320'

LIMIT OF WORK
325'

APPROXIMATE LIMIT

OF LANDFILL CAP PROPERTY LINE
EX. FENCE EX. BEDROCK
2% MIN SLOPE EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE MEMBRANE

SOIL WITH WASTE FILL, SEE

WASTE EXCAVATION PLAN
2'-0" MIN. OF SOIL CAP 2% MIN SLOPE
EX. GRADE
EX. TOP SOIL
EX. FOUNDATION FILL
(18" MIN.)
EX. WASTE

APPROXIMATE LIMIT OF

LANDFILL CAP
330'
130'
140'
135'
145'
125'
150'
120'
115
-5' 0' 5' 10' 15' 20' 25' 30' 40'35' 45' 50' 55' 70'65'60' 75' 85'80' 90' 95' 105'100' 110' 115' 125'120' 130' 135' 145'140' 75'

LIMIT OF WORK

APPROXIMATE LIMIT OF

LANDFILL CAP
EX. BEDROCK
2% MIN SLOPE
2% MIN SLOPE
2'-0" MIN. OF SOIL CAP

SOIL WITH WASTE FILL, SEE

WASTE EXCAVATION PLAN
EX. GEOCOMPOSITE DRAINAGE

NET & POLYETHYLENE MEMBRANE
EX. WASTE
EX. FOUNDATION FILL (18" MIN.)
EX. TOP SOIL
EX. GRADE

APPROXIMATE LIMIT OF

LANDFILL CAP

PROPERTY LINE
EX. FENCE
EX. BEDROCK
2'-0" MIN. OF SOIL CAP
EX. BEDROCK
160'
2 t:\Projects\2017 projects\17058_hiddenglenpark\3_constructiondocuments\CutFill\A17058_GD_Accept all Debris.dwg NO.

REVISIONS

DESCRIPTION
DESCRIPTION:

ELEV.

BENCH MARK

DATE BY
HORIZ.

SCALE
15 HIDDEN GLEN DUMP REMEDIATION DRAWN BY:

DESIGNED BY:

CHECKED BY:

BS
MR
DATE
DATE
DATE
SHEET NO.

DRAWING NO.

CAD FILE:

DATE:

OF
VERT.

Callander Associates
Landscape Architecture
RH/OP
5/22/24
10/14/24
5/22/24
OCTOBER 14, 2024

5.1 A17058_GD_Accept all Debris.dwg
2 SECTIONS

HIDDEN GLEN DUMP REMEDIATION- ALL WASTE
-
I
---~ -- -
,._ ;~I nf '11 TifTT "" • I , II I I I ~ 11 L ' ' " \\ -I "-- ( ----~ 1 \\
@ SECTION 1 - GRADf..lG
L5.1 SECTION ~TICAL SCALE: 1"-10' HOFIZONTAL SCALE: 1"-10' '
I
I
' ' ' '
@ SECTION 2 - GRADt<IG L5.1 SECTION ~TICAL SCALE: 1"-10' HOFIZONTAL SCALE: 1"-10' @ SECTION 3 - GRADf..lG L5.1 SECTION ~TICAL SCALE: 1"-10' HOFIZONTAL SCALE: 1"-10' '
I
I
I
I I :
-
' ' ' ' '
I
I
'

UTILITIES DEPARTMENT
.,,-(
V :P'
"
I
l
il' ~
1 ) ea
"
• 1
1 .,,,If

Ninyo & Moore | Hidden Glen Dump, Coombsville Road, Napa, California | 109558001 | October 16, 2024

APPENDIX G
DTSC Information Advisory – Clean Imported Fill

October 2001
ltisDTSC's
mission to restore,
protect and
enhance the
environment, to
ensure public
health,
environmental
quality and
economic vitality,
by regulating
hazardous waste,
conducting and
overseeing
cleanups, and
developing and
promoting
pollution
prevention.

State of California
California
Environmental
Protection Agency
e
Information Advisory
Clean Imported Fill Material
DEPARTMENT OF Toxic SussTANCES CONTROL
Executive Summary
This fact sheet has been prepared to ensure that inappropriate fill material is not introduced onto sensitive land use properties under the oversight of the DTSC or applicable regulatory authorities. Sensitive land use properties include those that contain facilities such as hospitals, homes, day care centers, and schools. This document only focuses on human health concerns and ecological issues are not addressed.

It identifies those types of land use activities that may be appropriate when determining whether a site may be used as a fill material source area. It also provides guidelines for the appropriate types of analyses that should be performed relative to the former land use, and for the number of samples that should be collected and analyzed based on the estimated volume of fill material that will need to be used The information provided in this fact sheet is not regulatory in nature, rather is to be used as a guide, and in most situations the final decision as to the acceptability of fill material for a sensitive land use property is made on a case-by-case basis by the appropriate regulatory agency.

Introduction
The use of imported fill material has recently come under scrutiny because of the instances where contaminated soil has been brought onto an otherwise clean site. However, there are currently no established standards in the statutes or regulations that address environmental requirements for imported fill material.

Therefore, the California Environmental Protection Agency, Department of Toxic Substances Control (DTSC) has prepared this fact sheet to identify procedures that can be used to minimize the possibility of introducing contaminated soil onto a site that requires imported fill material. Such sites include those that are undergoing site remediation, corrective action, and closure activities overseen by DTSC or the appropriate regulatory agency. These procedures may also apply to construction projects that will result in sensitive land uses. The intent of this fact sheet is to protect people who live on or otherwise use a sensitive land use property. By using this fact sheet as a guide, the reader will minimize the chance of introducing fill material that may result in potential risk to human health or the environment at some future time.

The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand

and cut your energy costs, see our website at www.dtsc.ca.gov.

ATTACHMENT 4
Overview
Both natural and manmade fill materials are used
for a variety of purposes. Fill material properties are commonly controlled to meet the necessary site specific engineering specifications. Because most sites requiring fill material are located in or near urban
areas, the fill materials are often obtained from construction projects that generate an excess of soil, and from demolition debris (asphalt, broken concrete,
etc.). However, materials from those types of sites
may or may not be appropriate, depending on the
proposed use of the fill, and the quality of the assessment and/or mitigation measures, if necessary.

Therefore, unless material from construction
projects can be demonstrated to be free of contamination and/or appropriate for the proposed use, the use of that material as fill should be avoided.

Selecting Fill Material
In general, the fill source area should be located in
nonindustrial areas, and not from sites undergoing
an environmental cleanup. Nonindustrial sites include those that were previously undeveloped, or used solely for residential or agricultural purposes.

If the source is from an agricultural area, care should be taken to insure that the fill does not include
former agricultural waste process byproducts such
as manure or other decomposed organic material.

Undesirable sources of fill material include industrial and/or commercial sites where hazardous maPotential Contaminants Based on the Fill Source Area Fill Source:

Land near to an existing freeway
Land near a mining area or rock quarry
Agricultural land
Residential/acceptable commercial land
Target Compounds
Lead (EPA methods 6010B or 7471A), PAHs
(EPA method 8310)
Heavy Metals (EPA methods 601 OB and
7 4 71 A), asbestos (polarized light
microscopy), pH
Pesticides (Organochlorine Pesticides: EPA
method 8081 A or 8080A; Organophosphorus Pesticides: EPA method 8141 A; Chlorinated Herbicides: EPA method 8151 A), heavy metals (EPA methods 601 OB and
7471A)
VOCs (EPA method 8021 or 8260B, as
appropriate and combined with collection
by EPA Method 5035), semi-VOCs (EPA
method 8270C), TPH (modified EPA method
8015), PCBs (EPA method 8082 or 8080A),
heavy metals including lead (EPA methods
601 OB and 7 4 71 A), asbestos (OSHA Method
ID-191)
*The recommended analyses should be performed in accordance with USEPA SW-846 methods (J 996).

Other possible analyses include Hexavalent Chromium: EPA method 7199 II

Recommended Fill Material Sampling Schedule
Area of Individual Borrow Area
2 acres or less
2 to 4 acres
4 to 10 acres
Greater than 10 acres
Volume of Borrow Area Stockpile
Up to 1,000 cubic yards
1,000 to 5,000 cubic yards
Greater than 5,000 cubic yards
terials were used, handled or stored as part of the
business operations, or unpaved parking areas where
petroleum hydrocarbons could have been spilled or
leaked into the soil. Undesirable commercial sites
include former gasoline service stations, retail strip
malls that contained dry cleaners or photographic
processing facilities, paint stores, auto repair and/or painting facilities. Undesirable industrial facilities
include metal processing shops, manufacturing facilities, aerospace facilities, oil refineries, waste treatment plants, etc. Alternatives to using fill from construction sites include the use of fill material obtained from a commercial supplier of fill material or from soil pits in rural or suburban areas. However, care should be taken to ensure that those materials are also uncontaminated.

Documentation and Analysis
In order to minimize the potential of introducing
contaminated fill material onto a site, it is necessary II
Sampling Requirements
Minimum of 4 samples
Minimum of 1 sample every 1/2 acre
Minimum of 8 samples
Minimum of 8 locations with 4 subsamples
per location
Samples per Volume
1 sample per 250 cubic yards
4 samples for first 1000 cubic yards + 1
sample per each additional 500 cubic yards
12 samples for first 5,000 cubic yards + 1
sample per each additional 1,000 cubic
yards
to verify through documentation that the fill source
is appropriate and/or to have the fill material analyzed for potential contaminants based on the location and history of the source area. Fill documentation should include detailed information on the previous use of the land from where the fill is taken, whether an environmental site assessment was performed and its findings, and the results of any testing performed. It is recommended that any such documentation should be signed by an appropriately licensed (CA-registered) individual. If such documentation is not available or is inadequate,
samples of the fill material should be chemically analyzed. Analysis of the fill material should be based on the source of the fill and knowledge of the prior
land use.

Detectable amounts of compounds of concern
within the fill material should be evaluated for risk
in accordance with the DTSC Preliminary Endangerment Assessment {PEA) Guidance Manual. If

metal analyses are performed, only those metals
(CAM 17 /Title 22) to which risk levels have been
assigned need to be evaluated. At present, the
DTSC is working to establish California Screening Levels (CSL) to determine whether some compounds of concern pose a risk. Until such time as these CSL values are established, DTSC recommends that the DTSC PEA Guidance Manual or an equivalent process be referenced. This guidance may include the Regional Water Quality Control Board's (RWQCB) guidelines for reuse
of non-hazardous petroleum hydrocarbon contaminated soil as applied to Total Petroleum Hydrocarbons (TPH) only. The RWQCB guidelines should not be used for volatile organic compounds
(VOCs) or semi-volatile organic compounds
(SVOCS). In addition, a standard laboratory data
package, including a summary of the QA/QC
(Quality Assurance/Quality Control) sample results should also accompany all analytical reports.

When possible, representative samples should be collected at the borrow area while the potential fill material is still in place, and analyzed prior to removal from the borrow area. In addition to performing
the appropriate analyses of the fill material, an appropriate number of samples should also be determined based on the approximate volume or area of soil to be used as fill material. The table above can
be used as a guide to determine the number of
samples needed to adequately characterize the fill
material when sampled at the borrow site.

Alternative Sampling
A Phase I or PEA may be conducted prior to sampling to determine whether the borrow area may have been impacted by previous activities on the
property. After the property has been evaluated, any
sampling that may be required can be determined
during a meeting with DTSC or appropriate regulatory agency. However, if it is not possible to analyze the fill material at the borrow area or determine that it is appropriate for use via a Phase I or PEA, it is recommended that one (1) sample per
truckload be collected and analyzed for all comII
pounds of concern to ensure that the imported soil
is uncontaminated and acceptable. (See chart on
Potential Contaminants Based on the Fill Source
Area for appropriate analyses) . This sampling frequency may be modified upon consultation with the DTSC or appropriate regulatory agency if all of
the fill material is derived from a common borrow
area. However, fill material that is not characterized
at the borrow area will need to be stockpiled either
on or off-site until the analyses have been completed.

In addition, should contaminants exceeding acceptance criteria be identified in the stockpiled fill material, that material will be deemed unacceptable
and new fill material will need to be obtained,
sampled and analyzed. Therefore, the DTSC recommends that all sampling and analyses should be completed prior to delivery to the site to ensure the
soil is free of contamination, and to eliminate unnecessary transportation charges for unacceptable fill material.

Composite sampling for fill material characterization may or may not be appropriate, depending on quality and homogeneity of source/borrow area, and
compounds of concern. Compositing samples for
volatile and semivolatile constituents is not acceptable. Composite sampling for heavy metals, pesticides, herbicides or PAH's from unanalyzed stockpiled soil is also unacceptable, unless it is stockpiled at the borrow area and originates from the same
source area. In addition, if samples are composited,
they should be from the same soil layer, and not
from different soil layers.

When very large volumes of fill material are anticipated, or when larger areas are being considered as borrow areas, the DTSC recommends that a Phase
I or PEA be conducted on the area to ensure that
the borrow area has not been impacted by previous
activities on the property. After the property has
been evaluated, any sampling that may be required
can be determined during a meeting with the
DTSC.

For further information, call Richard Coffman, Ph.D.,
RG., at (818) 551-2175.

5710 Ruffin Road | San Diego, California 92123 | p. 858.576.1000 ARIZONA | CALIFORNIA | COLORADO | NEVADA | TEXAS | UTAH ninyoandmoore.com
Geotechnical & Environmental Sciences Consultants

APPENDIX C

AIR QUALITY, GREENHOUSE GAS EMISSIONS, & ENERGY

SUPPORTING INFORMATION

Napa Hidden Glenn
CalEEMod Version 2022.1.1.29 Inputs
Project Characteristics
Start of Construction: August 1, 2025
End of Construction: October 30, 2025
Location: Napa County
Air District: Bay Area Air Quality Management District
Utility Company: Pacific Gas & Electric (Electricity)
Project Specifics
No existing buildings will be demolished.

The project site is 2.18-acres.

The project would require 3,500 cubic yards of waste soil export using 18.5-ton capacity haul trucks. Waste soil would be transported to Kettleman Hills Class I non-RCRA hazardous waste landfill (470 miles per round trip and involve 25 percent of the soil export trips) and Altamont Class II non-hazardous waste landfill (146 miles per roundtrip and involve 75 percent of the soil export trips). Therefore, there would be 71 round trips to Kettleman Hills and 213 round trips to Altamont. The average round trip would be 227 miles. As a result, there would be a total of 284 round trips of waste soil export with a total of 64,468 miles traveled.

The project would require 6,050 cubic yards of clean soil fill using a combination of 18.5-ton capacity haul trucks and 12-ton haul trucks. Each round trip would be 16 miles. As a result, there would be a total of 595 round trips of clean soil fill import with a total of 9,520 miles traveled.

The project would require approximately ten construction workers per day. Typically, construction activities would occur between 8 a.m. and 5 p.m. (eight hours per day), on Monday through Friday.

On-Road fugitive dust inputs left as default.

Estimated Construction Schedule
Description Start End Hours per Day Working Days
Mobilization 8/1/2025 8/14/2025 5 10
Grading 8/15/2025 9/11/2025 5 20
Clean Fill Import 9/12/2025 10/16/2025 5 25
Restoration 10/17/2025 10/30/2025 5 10
SOURCE: Applicant Data Response (March 11, 2025).

Estimated Construction Equipment Usage
Phase Equipment Amoun
t
Daily
Hours HP LF
Mobilization Graders 1 8 148 0.41
Mobilization Scrapers 1 8 423 0.48
Mobilization Tractors/Loaders/Backhoes 1 7 84 0.37
Grading Graders 1 8 148 0.41
Grading Rubber Tired Dozers 1 8 367 0.40
Grading Tractors/Loaders/Backhoes 2 7 84 0.37
Grading Excavators 2 8 36 0.38
Grading Plate Compactors 1 8 8 0.43
Clean Fill Import Tractors/Loaders/Backhoes 2 7 84 0.37 Clean Fill Import Graders 1 8 148 0.41
Clean Fill Import Rubber Tired Dozers 1 8 367 0.4
Restoration Graders 1 8 148 0.41
Restoration Scrapers 1 8 423 0.48
Restoration Tractors/Loaders/Backhoes 1 7 84 0.37
SOURCE: Applicant Data Response (March 11, 2025) and CARB CalEEMod Version 2022.1.

Napa Hidden Glenn Custom Report, 4/9/2025
1 / 26
Napa Hidden Glenn Custom Report
Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Year, Unmitigated

3. Construction Emissions Details

3.1. Mobilization (2025) - Unmitigated

3.3. Restoration (2025) - Unmitigated

3.5. Grading (2025) - Unmitigated

3.7. Clean Fill Import (2025) - Unmitigated

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

Napa Hidden Glenn Custom Report, 4/9/2025
2 / 26

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated

5. Activity Data

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.3. Construction Vehicles

5.3.1. Unmitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.5. Architectural Coatings

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities

5.6.2. Construction Earthmoving Control Strategies

5.7. Construction Paving

5.8. Construction Electricity Consumption and Emissions Factors

5.18. Vegetation

5.18.1. Land Use Change

Napa Hidden Glenn Custom Report, 4/9/2025
3 / 26

5.18.1.1. Unmitigated

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated

5.18.2. Sequestration

5.18.2.1. Unmitigated

6. Climate Risk Detailed Report

6.1. Climate Risk Summary

6.2. Initial Climate Risk Scores

6.3. Adjusted Climate Risk Scores

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

7.2. Healthy Places Index Scores

7.3. Overall Health & Equity Scores

7.4. Health & Equity Measures

7.5. Evaluation Scorecard

7.6. Health & Equity Custom Measures

8. User Changes to Default Data

Napa Hidden Glenn Custom Report, 4/9/2025
4 / 26

1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name Napa Hidden Glenn
Construction Start Date 8/4/2025
Lead Agency City of Napa
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 3.60
Precipitation (days) 42.2
Location 38.297890785929496, -122.26649688813013
County Napa
City Napa
Air District Bay Area AQMD
Air Basin San Francisco Bay Area
TAZ 805
EDFZ 2
Electric Utility Pacific Gas & Electric Company
Gas Utility Pacific Gas & Electric
App Version 2022.1.1.29

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area (sq ft)
Population Description
City Park 2.18 Acre 2.18 0.00 2.18 2.18 — —

Napa Hidden Glenn Custom Report, 4/9/2025
5 / 26

1.3. User-Selected Emission Reduction Measures by Emissions Sector No measures selected

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 2.46 1.90 22.8 19.6 0.06 0.81 4.39 5.20 0.72 1.78 2.50 — 8,675 8,675 0.34 0.96 13.3 8,982 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.95 1.61 15.3 15.8 0.03 0.66 3.11 3.76 0.60 1.42 2.02 — 3,329 3,329 0.14 0.14 0.06 3,375 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.35 0.28 2.91 2.79 0.01 0.12 0.49 0.61 0.10 0.20 0.30 — 861 861 0.03 0.06 0.40 881 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.06 0.05 0.53 0.51 < 0.005 0.02 0.09 0.11 0.02 0.04 0.06 — 142 142 0.01 0.01 0.07 146

2.2. Construction Emissions by Year, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Year TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily -
Summer
(Max)
— — — — — — — — — — — — — — — — — —
2025 2.46 1.90 22.8 19.6 0.06 0.81 4.39 5.20 0.72 1.78 2.50 — 8,675 8,675 0.34 0.96 13.3 8,982 -------------------
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
6 / 26
Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2025 1.95 1.61 15.3 15.8 0.03 0.66 3.11 3.76 0.60 1.42 2.02 — 3,329 3,329 0.14 0.14 0.06 3,375 Average
Daily
— — — — — — — — — — — — — — — — — —
2025 0.35 0.28 2.91 2.79 0.01 0.12 0.49 0.61 0.10 0.20 0.30 — 861 861 0.03 0.06 0.40 881 Annual — — — — — — — — — — — — — — — — — —
2025 0.06 0.05 0.53 0.51 < 0.005 0.02 0.09 0.11 0.02 0.04 0.06 — 142 142 0.01 0.01 0.07 146

3. Construction Emissions Details

3.1. Mobilization (2025) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.42 1.19 10.9 11.0 0.03 0.47 — 0.47 0.43 — 0.43 — 2,717 2,717 0.11 0.02 — 2,726 Dust
From
Material
Movement
— — — — — — 0.62 0.62 — 0.07 0.07 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
7 / 26
Off-Roa
Equipment

0.04 0.03 0.30 0.30 < 0.005 0.01 — 0.01 0.01 — 0.01 — 74.4 74.4 < 0.005 < 0.005 — 74.7 Dust
From
Material
Movement
— — — — — — 0.02 0.02 — < 0.005 < 0.005 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.01 0.01 0.05 0.05 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 12.3 12.3 < 0.005 < 0.005 — 12.4 Dust
From
Material
Movement
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.06 0.92 0.00 0.00 0.17 0.17 0.00 0.04 0.04 — 173 173 < 0.005 0.01 0.74 176 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.47 4.47 < 0.005 < 0.005 0.01 4.54 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — — Page 228 of 307 ATTACHMENT 4 Napa Hidden Glenn Custom Report, 4/9/2025
8 / 26
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.74 0.74 < 0.005 < 0.005 < 0.005 0.75 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.3. Restoration (2025) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.42 1.19 10.9 11.0 0.03 0.47 — 0.47 0.43 — 0.43 — 2,717 2,717 0.11 0.02 — 2,726 Dust
From
Material
Movement
— — — — — — 0.62 0.62 — 0.07 0.07 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.04 0.03 0.30 0.30 < 0.005 0.01 — 0.01 0.01 — 0.01 — 74.4 74.4 < 0.005 < 0.005 — 74.7 Dust
From
Material
Movement
— — — — — — 0.02 0.02 — < 0.005 < 0.005 — — — — — — —
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
9 / 26
Onsite 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 truck
Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.01 0.01 0.05 0.05 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 12.3 12.3 < 0.005 < 0.005 — 12.4 Dust
From
Material
Movement
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.08 0.84 0.00 0.00 0.17 0.17 0.00 0.04 0.04 — 162 162 0.01 0.01 0.02 164 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.47 4.47 < 0.005 < 0.005 0.01 4.54 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.74 0.74 < 0.005 < 0.005 < 0.005 0.75 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

Napa Hidden Glenn Custom Report, 4/9/2025
10 / 26

3.5. Grading (2025) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.07 1.74 16.0 16.8 0.03 0.70 — 0.70 0.65 — 0.65 — 2,772 2,772 0.11 0.02 — 2,782 Dust
From
Material
Movement
— — — — — — 2.77 2.77 — 1.34 1.34 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.11 0.10 0.88 0.92 < 0.005 0.04 — 0.04 0.04 — 0.04 — 152 152 0.01 < 0.005 — 152 Dust
From
Material
Movement
— — — — — — 0.15 0.15 — 0.07 0.07 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
11 / 26
Off-Roa 0.02 0.02 0.16 0.17 < 0.005 0.01 — 0.01 0.01 — 0.01 — 25.2 25.2 < 0.005 < 0.005 — 25.2 d
Equipm
ent
Dust
From
Material
Movement
— — — — — — 0.03 0.03 — 0.01 0.01 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.06 0.92 0.00 0.00 0.17 0.17 0.00 0.04 0.04 — 173 173 < 0.005 0.01 0.74 176 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.30 0.08 6.74 1.91 0.04 0.11 1.46 1.57 0.07 0.41 0.48 — 5,729 5,729 0.22 0.93 12.6 6,024 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.04 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 8.94 8.94 < 0.005 < 0.005 0.02 9.08 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.02 < 0.005 0.39 0.10 < 0.005 0.01 0.08 0.08 < 0.005 0.02 0.03 — 314 314 0.01 0.05 0.30 330 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 1.48 1.48 < 0.005 < 0.005 < 0.005 1.50 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling < 0.005 < 0.005 0.07 0.02 < 0.005 < 0.005 0.01 0.02 < 0.005 < 0.005 < 0.005 — 52.0 52.0 < 0.005 0.01 0.05 54.6

3.7. Clean Fill Import (2025) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual)

Napa Hidden Glenn Custom Report, 4/9/2025
12 / 26
Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.80 1.51 14.1 14.5 0.02 0.64 — 0.64 0.59 — 0.59 — 2,455 2,455 0.10 0.02 — 2,463 Dust
From
Material
Movement
— — — — — — 2.77 2.77 — 1.34 1.34 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.80 1.51 14.1 14.5 0.02 0.64 — 0.64 0.59 — 0.59 — 2,455 2,455 0.10 0.02 — 2,463 Dust
From
Material
Movement
— — — — — — 2.77 2.77 — 1.34 1.34 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.12 0.10 0.96 0.99 < 0.005 0.04 — 0.04 0.04 — 0.04 — 168 168 0.01 < 0.005 — 169 Dust
From
Material
Movement
— — — — — — 0.19 0.19 — 0.09 0.09 — — — — — — —
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
13 / 26
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.02 0.02 0.18 0.18 < 0.005 0.01 — 0.01 0.01 — 0.01 — 27.8 27.8 < 0.005 < 0.005 — 27.9 Dust
From
Material
Movement
— — — — — — 0.03 0.03 — 0.02 0.02 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.06 0.92 0.00 0.00 0.17 0.17 0.00 0.04 0.04 — 173 173 < 0.005 0.01 0.74 176 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.06 0.02 1.11 0.43 < 0.005 0.01 0.17 0.18 0.01 0.05 0.06 — 712 712 0.04 0.12 1.49 749 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.08 0.84 0.00 0.00 0.17 0.17 0.00 0.04 0.04 — 162 162 0.01 0.01 0.02 164 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling 0.06 0.02 1.17 0.44 < 0.005 0.01 0.17 0.18 0.01 0.05 0.06 — 712 712 0.04 0.12 0.04 748 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 < 0.005 0.06 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 11.2 11.2 < 0.005 < 0.005 0.02 11.3 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling < 0.005 < 0.005 0.08 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 48.8 48.8 < 0.005 0.01 0.04 51.2 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 1.85 1.85 < 0.005 < 0.005 < 0.005 1.88

Napa Hidden Glenn Custom Report, 4/9/2025
14 / 26
Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 8.07 8.07 < 0.005 < 0.005 0.01 8.48

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetati
on
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

Napa Hidden Glenn Custom Report, 4/9/2025
15 / 26
Daily, — — — — — — — — — — — — — — — — — —
Winter
(Max)
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
-------------------

Napa Hidden Glenn Custom Report, 4/9/2025
16 / 26
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Mobilization Site Preparation 8/1/2025 8/14/2025 5.00 10.0 1 Restoration Site Preparation 10/17/2025 10/30/2025 5.00 10.0 4 Grading Grading 8/15/2025 9/11/2025 5.00 20.0 2
Clean Fill Import Grading 9/12/2025 10/16/2025 5.00 25.0 3

5.2. Off-Road Equipment

5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Mobilization Graders Diesel Average 1.00 8.00 148 0.41
Mobilization Scrapers Diesel Average 1.00 8.00 423 0.48

Napa Hidden Glenn Custom Report, 4/9/2025
17 / 26
Mobilization Tractors/Loaders/Back Diesel Average 1.00 7.00 84.0 0.37 Restoration Graders Diesel Average 1.00 8.00 148 0.41
Restoration Scrapers Diesel Average 1.00 8.00 423 0.48
Restoration Tractors/Loaders/Back
hoes
Diesel Average 1.00 7.00 84.0 0.37
Grading Graders Diesel Average 1.00 8.00 148 0.41
Grading Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40 Grading Tractors/Loaders/Back
hoes
Diesel Average 2.00 7.00 84.0 0.37
Grading Excavators Diesel Average 2.00 8.00 36.0 0.38
Grading Plate Compactors Diesel Average 1.00 8.00 8.00 0.43 Clean Fill Import Tractors/Loaders/Back
hoes
Diesel Average 2.00 7.00 84.0 0.37
Clean Fill Import Graders Diesel Average 1.00 8.00 148 0.41 Clean Fill Import Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Mobilization — — — —
Mobilization Worker 20.0 11.7 LDA,LDT1,LDT2
Mobilization Vendor 0.00 8.40 HHDT,MHDT
Mobilization Hauling 0.00 20.0 HHDT
Mobilization Onsite truck 0.00 — HHDT
Grading — — — —
Grading Worker 20.0 11.7 LDA,LDT1,LDT2
Grading Vendor 0.00 8.40 HHDT,MHDT
Grading Hauling 14.2 114 HHDT

Napa Hidden Glenn Custom Report, 4/9/2025
18 / 26
Grading Onsite truck 0.00 — HHDT
Clean Fill Import — — — —
Clean Fill Import Worker 20.0 11.7 LDA,LDT1,LDT2
Clean Fill Import Vendor 0.00 8.40 HHDT,MHDT
Clean Fill Import Hauling 23.8 8.00 HHDT
Clean Fill Import Onsite truck 0.00 — HHDT
Restoration — — — —
Restoration Worker 20.0 11.7 LDA,LDT1,LDT2
Restoration Vendor 0.00 8.40 HHDT,MHDT
Restoration Hauling 0.00 20.0 HHDT
Restoration Onsite truck 0.00 — HHDT

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies
Non-applicable. No control strategies activated by user.

5.5. Architectural Coatings
Phase Name Residential Interior Area
Coated (sq ft)
Residential Exterior Area
Coated (sq ft)
Non-Residential Interior Area
Coated (sq ft)
Non-Residential Exterior Area
Coated (sq ft)
Parking Area Coated (sq ft)

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (Cubic
Yards)
Material Exported (Cubic
Yards)
Acres Graded (acres) Material Demolished (sq. ft.) Acres Paved (acres) Mobilization 0.00 0.00 15.0 0.00 —
Restoration 0.00 0.00 15.0 0.00 —
Grading 0.00 3,500 20.0 0.00 —

Napa Hidden Glenn Custom Report, 4/9/2025
19 / 26
Clean Fill Import 6,050 0.00 25.0 0.00 —

5.6.2. Construction Earthmoving Control Strategies
Control Strategies Applied Frequency (per day) PM10 Reduction PM2.5 Reduction Water Exposed Area 2 61% 61%

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
City Park 0.00 0%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Year and Emission Factor (lb/MWh)
Year kWh per Year CO2 CH4 N2O
2025 0.00 204 0.03 < 0.005

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated
Biomass Cover Type Initial Acres Final Acres

Napa Hidden Glenn Custom Report, 4/9/2025
20 / 26

5.18.2. Sequestration

5.18.2.1. Unmitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

6. Climate Risk Detailed Report

6.1. Climate Risk Summary
Cal-Adapt midcentury 2040–2059 average projections for four hazards are reported below for your project location. These are under Representation Concentration Pathway (RCP) 8.5 which assumes GHG emissions will continue to rise strongly through 2050 and then plateau around 2100.

Climate Hazard Result for Project Location Unit
Temperature and Extreme Heat 11.4 annual days of extreme heat Extreme Precipitation 7.95 annual days with precipitation above 20 mm Sea Level Rise — meters of inundation depth
Wildfire 15.6 annual hectares burned
Temperature and Extreme Heat data are for grid cell in which your project are located. The projection is based on the 98th historical percentile of daily maximum/minimum temperatures from observed historical data (32 climate model ensemble from Cal-Adapt, 2040–2059 average under RCP 8.5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Extreme Precipitation data are for the grid cell in which your project are located. The threshold of 20 mm is equivalent to about ¾ an inch of rain, which would be light to moderate rainfall if received over a full day or heavy rain if received over a period of 2 to 4 hours. Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Sea Level Rise data are for the grid cell in which your project are located. The projections are from Radke et al. (2017), as reported in Cal-Adapt (Radke et al., 2017, CEC-500-2017-008), and consider inundation location and depth for the San Francisco Bay, the Sacramento-San Joaquin River Delta and California coast resulting different increments of sea level rise coupled with extreme storm events. Users may select from four scenarios to view the range in potential inundation depth for the grid cell. The four scenarios are: No rise, 0.5 meter, 1.0 meter, 1.41 meters Wildfire data are for the grid cell in which your project are located. The projections are from UC Davis, as reported in Cal-Adapt (2040–2059 average under RCP 8.5), and consider historical data of climate, vegetation, population density, and large (> 400 ha) fire history. Users may select from four model simulations to view the range in potential wildfire probabilities for the grid cell. The four simulations make different assumptions about expected rainfall and temperature are: Warmer/drier (HadGEM2-ES), Cooler/wetter (CNRM-CM5), Average conditions (CanESM2), Range of different rainfall and temperature possibilities (MIROC5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat N/A N/A N/A N/A
Extreme Precipitation 2 0 0 N/A
Sea Level Rise 1 0 0 N/A

Napa Hidden Glenn Custom Report, 4/9/2025
21 / 26
Wildfire 1 0 0 N/A
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 0 0 0 N/A
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the greatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores do not include implementation of climate risk reduction measures.

6.3. Adjusted Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat N/A N/A N/A N/A
Extreme Precipitation 2 1 1 3
Sea Level Rise 1 1 1 2
Wildfire 1 1 1 2
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 1 1 1 2
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the greatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores include implementation of climate risk reduction measures.

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

Napa Hidden Glenn Custom Report, 4/9/2025
22 / 26
The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state.

Indicator Result for Project Census Tract
Exposure Indicators —
AQ-Ozone 20.8
AQ-PM 45.9
AQ-DPM 35.9
Drinking Water 43.0
Lead Risk Housing 46.3
Pesticides 66.6
Toxic Releases 54.5
Traffic 9.82
Effect Indicators —
CleanUp Sites 75.6
Groundwater 65.3
Haz Waste Facilities/Generators 7.35
Impaired Water Bodies 33.2
Solid Waste 70.4
Sensitive Population —
Asthma 32.2
Cardio-vascular 20.3
Low Birth Weights 13.5
Socioeconomic Factor Indicators —
Education 24.6
Housing 8.86
Linguistic 32.0
Poverty 22.0
Unemployment 0.00

Napa Hidden Glenn Custom Report, 4/9/2025
23 / 26

7.2. Healthy Places Index Scores
The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

Indicator Result for Project Census Tract
Economic —
Above Poverty 76.32490697
Employed 85.83344027
Median HI 82.40728859
Education —
Bachelor's or higher 74.51559091
High school enrollment 16.64314128
Preschool enrollment 19.87681252
Transportation —
Auto Access 87.47593995
Active commuting 28.80790453
Social —
2-parent households 85.55113563
Voting 92.53175927
Neighborhood —
Alcohol availability 34.56948544
Park access 50.84049788
Retail density 16.54048505
Supermarket access 26.85743616
Tree canopy 95.09816502
Housing —
Homeownership 56.88438342
Housing habitability 91.81316566
Low-inc homeowner severe housing cost burden 84.04978827 Low-inc renter severe housing cost burden 93.46849737

Napa Hidden Glenn Custom Report, 4/9/2025
24 / 26
Uncrowded housing 68.66418581
Health Outcomes —
Insured adults 80.31566791
Arthritis 12.5
Asthma ER Admissions 61.0
High Blood Pressure 18.2
Cancer (excluding skin) 9.1
Asthma 51.9
Coronary Heart Disease 23.5
Chronic Obstructive Pulmonary Disease 37.6
Diagnosed Diabetes 70.5
Life Expectancy at Birth 71.8
Cognitively Disabled 28.0
Physically Disabled 68.4
Heart Attack ER Admissions 91.4
Mental Health Not Good 71.0
Chronic Kidney Disease 45.1
Obesity 54.6
Pedestrian Injuries 63.5
Physical Health Not Good 64.0
Stroke 45.2
Health Risk Behaviors —
Binge Drinking 32.5
Current Smoker 70.0
No Leisure Time for Physical Activity 75.4
Climate Change Exposures —
Wildfire Risk 0.0
SLR Inundation Area 74.5

Napa Hidden Glenn Custom Report, 4/9/2025
25 / 26
Children 78.7
Elderly 19.2
English Speaking 84.7
Foreign-born 26.1
Outdoor Workers 53.0
Climate Change Adaptive Capacity —
Impervious Surface Cover 79.2
Traffic Density 13.1
Traffic Access 49.0
Other Indices —
Hardship 18.0
Other Decision Support —
2016 Voting 96.1

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 15.0 Healthy Places Index Score for Project Location (b) 81.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) No Project Located in a Low-Income Community (Assembly Bill 1550) No Project Located in a Community Air Protection Program Community (Assembly Bill 617) No a: The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state. b: The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

7.4. Health & Equity Measures
No Health & Equity Measures selected.

7.5. Evaluation Scorecard
Health & Equity Evaluation Scorecard not completed.

Napa Hidden Glenn Custom Report, 4/9/2025
26 / 26

7.6. Health & Equity Custom Measures
No Health & Equity Custom Measures created.

8. User Changes to Default Data
Screen Justification
Construction: Construction Phases Applicant Data Responses March 11, 2025 Construction: Off-Road Equipment Applicant Data Response March 11, 2025 Construction: Dust From Material Movement Applicant Data Response March 11, 2025 Construction: Trips and VMT Applicant Data Response March 11, 2025

APPENDIX D

BIOLOGICAL RESOURCES ASSESSMENT

Biological Resources Assessment
Hidden Glen Remediation Project
City of Napa
April 2025

Prepared for:

City of Napa
1700 2nd Street, Suite 100
Napa, CA 94559
RCH Group
6521 Chesbro Circle
Rancho Murieta, CA 95683
Prepared by:

Swift Biological Consulting LLC
Sebastopol, CA 95472
https://swiftbiological.com/
~ SWIFT BIOLOGICAL