Attachment D - Tech Appendix N (SWQMP) — San Marcos City Council, December 12, 2023 (part 2 of 2)

3666120 3666170 3666220 3666270 3666320 3666370 3666420 3666470 3666520 3666120 3666170 3666220 3666270 3666320 3666370 3666420 3666470 3666520 482090 482140 482190 482240 482290 482340 482390
482090 482140 482190 482240 482290 482340 482390
33° 8' 14'' N
117° 11' 31'' W
33° 8' 14'' N
117° 11' 19'' W
33° 8' 0'' N
117° 11' 31'' W
33° 8' 0'' N
117° 11' 19'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 100 200 400 600
Feet
0 30 60 120 180
Meters
Map Scale: 1:2,120 if printed on A portrait (8.5" x 11") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map
measurements.

Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:

Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: San Diego County Area, California
Survey Area Data: Version 15, May 27, 2020
Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Jan 23, 2020—Feb 13, 2020
The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Hydrologic Soil Group—San Diego County Area, California Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/17/2021

Page 2 of 4 ends

Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI PeA Placentia sandy loam, 0
to 2 percent slopes,
warm MAAT, MLRA
19 C 0.4 3.9%
PeC Placentia sandy loam, 2
to 9 percent slopes,
warm MAAT, MLRA
19 C 6.9 60.5%
PfA Placentia sandy loam,
thick surface, 0 to 2
percent slo pes
D 3.9 34.6%
RaB Ramona sandy loam, 2
to 5 percent slopes
C 0.1 1.0%
Totals for Area of Interest 11.4 100.0%
Hydrologic Soil Group—San Diego County Area, California Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/17/2021

Page 3 of 4 ends

Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture.

These soils have a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.

Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—San Diego County Area, California Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
2/17/2021

Page 4 of 4 ends

Drawdown Calculations

Input Data Vault Preliminary Sizing BMP Storage Volume Requirements:

Drawdown time (hrs) Factor
WQ 85th Percentile depth= 0.67 in 9 0.72 Volume-Based Media loading rate 0.28 gpm/sf 12 0.85
24 1.25
36 1.5
48 1.8
72 2.2
96 2.6
120 2.8
DMA ID
BMP Drainage
Area (ac)
BMP
Drainage
Area (SF)
Impervious
Area (ac)
Amended
Soils (ac)
(C=0.1)
%
Impervious
Composite
C1 DCV (AF)
Estimate
Drawdown
time (hr)
Capture
Factor
BMP
Capture
Volume
Reqd, (AF)
BMP
Capture
Volume
Reqd, (CF)
Q_avg
drawdown
(cfs)
Q_avg
drawdown
(gpm)
BMP H
(Treatment
HGL) (ft)
Min Filter
Perimeter P
(ft)
Min Area
Vault (SF)
Vault H
(ft)
Area of
Vault
(ft^2)
BMP
Capture
Volume
Provided,
(CF)
Min WQ
Depth (ft)
Orifice
Depression
(Drop
below
vault) (ft)
Bottom Orif
size (in)
WQ
Volume
Drawdown
(hours)
Max Q
orifice
(cfs)
Quantity
of MWUs MWU Size
Vault
Volume
(CF)
1A 2.67 116391 2.40 0.27 90% 0.82 0.122 12 0.85 0.10 4523 0.10 47.0 3.1 54.1 1459.1 4 1952 5660.8 2.32 0.2 2 12.1 0.186 1 MWU8-12 7808 2A 4.02 175055 3.65 0.37 91% 0.83 0.186 9 0.72 0.13 5819 0.18 80.6 4 72.0 1454.7 5 4500 17100 1.29 0.2 3.8 9.2 0.517 1 MWU8-20 22500 Volume-Based Sizing

APPENDIX 4
CD Containing SWMM Input and Output Files

APPENDIX 5
Exhibits

P3BP2AP3BP2AP3BP2A
P1Brev.P1B
P1BP4
P1D
P1CP3AP1BP2BP1AP1D P2Brev.P1Arev.P1Drev.P1Brev.P3Arev.P1Crev.

P1Brev.P4rev.

P1Drev.P1D
P4 P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

ACCESSIBLERESIDENTIALFIRST FLOOR ACCESSIBLERESIDENTIALFIRST FLOOR LowVoltageFireRiser
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP17RUP 17RUP17RUP
17RUP
17RUP
17RUP17RUP
17RUP17RUP
RT-P1RT-P1RT-P1
RT-P1RT-P1A

STOOPSTOOPSTOOPSTOOPSTOOP

GARAGEGARAGEGARAGEGARAGEGARAGEFIRERISER

STOOPSTOOPSTOOPSTOOPSTOOP
RT-P1RT-P1ART-P1RT-P1AGARAGEGARAGEGARAGEGARAGERT-P1GARAGEMU-P2MU-P2RES. GARAGERES. GARAGEFIRERISER COMMERCIALELEC.
17RUP17RUP17RUP17RUP
P5
P6
P5
P6

FIRERISER
17R UP
17RUP
17RUP
17R UP
17R UP
P3
P1P2
P4P6

FIRE RISER
17R UP
17RUP
17RUP 17RUP17RUP
P6
P1P2
P5
P5

FIRE RISER
17RUP
17R UP
17RUP
17RUP17RUP
P6A
P1P2
P5
P5

FIRE RISER
17R UP17R UP
17R UP 17R UP
17RUP17RUP
P3P4P6P5P4P3

FIRE RISER
17R UP
17RUP
17RUP
17R UP
17R UP
17RUP
P5
P6A
P3P4
P1P2

FIRE RISER
17R UP
17R UP
17RUP
17RUP
17R UP
17RUP17RUP
P3P4
P2
P5
P1
P6
P6A
FIRE RISER17R UP
17R UP
17RUP
17RUP 17RUP 17RUP 17RUP
17R UP
17RUPP1P4 P5P6AP6 P5 P4P6 P3

FIRERISER
MU-P2MU-P2

STOOPSTOOPSTOOPSTOOP
RT-P1RT-P1RT-P1RT-P1GARAGEGARAGEGARAGEGARAGERES. GARAGERES. GARAGE

FIRERISER

COMMERICALTRASH
COMMERCIALELEC.

STOOPSTOOPSTOOP
RT-P1ART-P1GARAGEGARAGERT-P1GARAGEMU-P2MU-P2RES. GARAGERES. GARAGE MU-P2MU-P2RES. GARAGERES. GARAGE FIRERISERCOMMERCIALELEC.

P3BP2AP3BP2AP3BP2A
P1Brev. P1B
P1BP4
P1D
P1CP3AP1BP2BP1AP1DP2Brev.P1Arev.P1Drev.P1Brev.P3Arev.P1Crev.

P1Brev.P4rev.

P1Drev. P1D
P4P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

ACCESSIBLERESIDENTIALFIRST FLOOR

ACCESSIBLERESIDENTIALFIRST FLOOR
LowVoltageFireRiser
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP 17RUP17RUP 17RUP
17RUP
17RUP
17RUP 17RUP
17RUP 17RUP
P3BP2AP3BP2AP3BP2A
P1Brev.P1B
P1BP4
P1D
P1CP3AP1BP2BP1AP1D P2Brev.P1Arev.P1Drev.P1Brev.P3Arev.P1Crev.

P1Brev.P4rev.

P1Drev.P1D
P4 P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

P1Brev.P4rev.

P1Drev. P1D
P4P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

ACCESSIBLERESIDENTIALFIRST FLOORACCESSIBLERESIDENTIALFIRST FLOOR LowVoltageFireRiser
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP 17RUP17RUP 17RUP
17RUP
17RUP
17RUP 17RUP
17RUP 17RUP
P3BP2AP3BP2AP3BP2A
P1Brev.P1B P1BP4
P1D
P1CP3AP1BP2BP1AP1D P2Brev.P1Arev.P1Drev.P1Brev.P3Arev.P1Crev.

P1Brev.P4rev.

P1Drev.P1D
P4
P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

P1Brev.P4rev.

P1Drev. P1D
P4P4rev.

PrimaryUtility Closet
Secondary UtilityCloset
FireRiser
P1Drev.

ACCESSIBLERESIDENTIALFIRST FLOORACCESSIBLERESIDENTIALFIRST FLOOR LowVoltageFireRiser
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP
17RUP 17RUP17RUP 17RUP
17RUP
17RUP
17RUP 17RUP
17RUP 17RUP
ABC
D E F
J
IH
G
K
L M
N
OP
TSRQ
4 cubic yard bin @6'-9" x4'-6"

CITY OF SAN MARCOSRESTAURANT ROW

City of San Marcos PDP SWQMP Template Date: March 15, 2016 PDP SWQMP Preparation Date: November 18, 2022
ATTACHMENT 3
Structural BMP Maintenance Information

This is the cover sheet for Attachment 3.

Indicate which Items are Included behind this cover sheet:

Attachment
Sequence
Contents Checklist
Attachment 3a Structural BMP Maintenance Thresholds
and Actions (Required)

 Included

See Structural BMP Maintenance
Information Checklist on the back of
this Attachment cover sheet.

Attachment 3b Draft Maintenance Agreement (when
applicable)
Included
Not Applicable

City of San Marcos PDP SWQMP Template Date: March 15, 2016 PDP SWQMP Preparation Date: November 18, 2022
Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment:

 Preliminary Design / Planning / CEQA level submittal:

Attachment 3a must identify:

 Typical maintenance indicators and actions for proposed structural BMP(s) based on Section 7.7 of the BMP Design Manual

Attachment 3b is not required for preliminary design / planning / CEQA level submittal.

Final Design level submittal:

Attachment 3a must identify:

Specific maintenance indicators and actions for proposed structural BMP(s). This shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed components of the structural BMP(s)
How to access the structural BMP(s) to inspect and perform maintenance Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds)
Manufacturer and part number for proprietary parts of structural BMP(s) when applicable
Maintenance thresholds specific to the structural BMP(s), with a location-specific frame of reference (e.g., level of accumulated materials that triggers removal of the materials, to be identified based on viewing marks on silt posts or measured with a survey rod with respect to a fixed benchmark within the BMP)
Recommended equipment to perform maintenance
When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management

Attachment 3b: For private entity operation and maintenance, Attachment 3b shall include a draft maintenance agreement in the local jurisdiction's s tandard format (PDP applicant to contact the [City Engineer] to obtain the current maintenance agreement forms).

Modular Wetlands ® Linear
A Stormwater Biofiltration Solution

OPERATION & MAINTENANCE
MANUAL

www.modularwetlands.com

Inspection Guidelines for
Modular Wetland System - Linear

Inspection Summary

o Inspect Pre-Treatment, Biofiltration and Discharge Chambers – average inspection interval is 6 to 12 months.
 (15 minute average inspection time).

o NOTE: Pollutant loading varies greatly from site to site and no two sites are the same. Therefore, the first year requires inspection monthly during the wet season and every other month during the dry season in order to observe and record the amount of pollutant loading the system is receiving.

System Diagram

Access to separation chamber
and pre-filter cartridges
1 Pre-treatment Chamber
2 Biofiltration Chamber
3 Discharge Chamber
Access to discharge
chamber and orifice control

www.modularwetlands.com

Inspection Overview

As with all stormwater BMPs inspection and maintenance on the MWS Linear is necessary.

Stormwater regulations require that all BMPs be inspected and maintained to ensure they are operating as designed to allow for effective pollutant removal and provide protection to receiving water bodies. It is recommended that inspections be performed multiple times during the first year to assess the site specific loading conditions. This is recommended because pollutant loading and pollutant characteristics can vary greatly from site to site. Variables such as nearby soil erosion or construction sites, winter sanding on roads, amount of daily traffic and land use can increase pollutant loading on the system. The first year of inspections can be used to set inspection and maintenance intervals for subsequent years to ensure appropriate maintenance is provided. Without appropriate maintenance a BMP will exceed its storage capacity which can negatively affect its continued performance in removing and retaining captured pollutants.

Inspection Equipment

Following is a list of equipment to allow for simple and effective inspection of the MWS Linear:
 Modular Wetland Inspection Form
 Flashlight
 Manhole hook or appropriate tools to remove access hatches and covers  Appropriate traffic control signage and procedures
 Measuring pole and/or tape measure.
 Protective clothing and eye protection.
 7/16” open or closed ended wrench.
 Large permanent black marker (initial inspections only – first year)  Note: entering a confined space requires appropriate safety and certification. It is generally not required for routine inspections of the system.

www.modularwetlands.com

Inspection Steps

The core to any successful stormwater BMP maintenance program is routine inspections. The inspection steps required on the MWS Linear are quick and easy. As mentioned above the first year should be seen as the maintenance interval establishment phase. During the first year more frequent inspections should occur in order to gather loading data and maintenance requirements for that specific site. This information can be used to establish a base for long term inspection and maintenance interval requirements.

The MWS Linear can be inspected though visual observation without entry into the system. All necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control and other safety measures to protect the inspector and near-by pedestrians from any dangers associated with an open access hatch or manhole. Once these access covers have been safely opened the inspection process can proceed:

 Prepare the inspection form by writing in the necessary information including project name, location, date & time, unit number and other info (see inspection form).  Observe the inside of the system through the access hatches. If minimal light is available and vision into the unit is impaired utilize a flashlight to see inside the system and all of its chambers.
 Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber, biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the inspection form.
 Through observation and/or digital photographs estimate the amount of trash, debris and sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on the inspection form.

www.modularwetlands.com

 Through visual observation inspect the condition of the pre-filter cartridges. Look for excessive build-up of sediments on the cartridges, any build-up on the top of the cartridges, or clogging of the holes. Record this information on the inspection form. The pre-filter cartridges can further be inspected by removing the cartridge tops and assessing the color of the BioMediaGREEN filter cubes (requires entry into pre-treatment chamber – see notes above regarding confined space entry). Record the color of the material. New material is a light green in color. As the media becomes clogged it will turn darker in color, eventually becoming dark brown or black. Using the below color indicator record the percentage of media exhausted.

 The biofiltration chamber is generally maintenance free due to the system’s advanced pre- treatment chamber. For units which have open planters with vegetation it is recommended that the vegetation be inspected. Look for any plants that are dead or showing signs of disease or other negative stressors. Record the general health of the plants on the inspection and indicate through visual observation or digital photographs if trimming of the vegetation is needed.
 The discharge chamber houses the orifice control structure, drain down filter and is connected to the outflow pipe. It is important to check to ensure the orifice is in proper operating conditions and free of any obstructions. It is also important to assess the condition of the drain down filter media which utilizes a block form of the BioMediaGREEN. Assess in the same manner as the cubes in the Pre-Filter Cartridge as mentioned above. Generally, the discharge chamber will be clean and free of debris. Inspect the water marks on the side walls. If possible, inspect the discharge chamber during a rain event to assess the amount of flow leaving the system while it is at 100% capacity (pre-treatment chamber water level at peak HGL). The water level of the flowing water should be compared to the watermark level on the side walls which is an indicator of the highest discharge rate the system achieved when initially installed.

Record on the form is there is any difference in level from watermark in inches. 0% -- Percent Clogged -- 100% New
BioMediaGREEN
Exhausted
BioMediaGREEN
85%

www.modularwetlands.com

 NOTE: During the first few storms the water level in the outflow chamber should be observed and a 6” long horizontal watermark line drawn (using a large permanent marker) at the water level in the discharge chamber while the system is operating at 100% capacity. The diagram below illustrates where a line should be drawn. This line is a reference point for future inspections of the system:

 Water level in the discharge chamber is a function of flow rate and pipe size. Observation of water level during the first few months of operation can be used as a benchmark level for future inspections. The initial mark and all future observations shall be made when system is at 100% capacity (water level at maximum level in pre-treatment chamber). If future water levels are below this mark when system is at 100% capacity this is an indicator that maintenance to the pre-filter cartridges may be needed.  Finalize inspection report for analysis by the maintenance manager to determine if maintenance is required.

Water Level
Mark
Water Level
Marks
Using a permanent marker draw a 6 inch long horizontal line, as shown, at the higher water level in the MWS Linear discharge chamber.

www.modularwetlands.com

Maintenance Indicators

Based upon observations made during inspection, maintenance of the system may be required based on the following indicators:

 Missing or damaged internal components or cartridges.  Obstructions in the system or its inlet or outlet.
 Excessive accumulation of floatables in the pre-treatment chamber in which the length and width of the chamber is fully impacted more than 18”.

 Excessive accumulation of sediment in the pre-treatment chamber of more than 6” in depth.

www.modularwetlands.com

 Excessive accumulation of sediment on the BioMediaGREEN media housed within the pre- filter cartridges. The following chart shows photos of the condition of the BioMediaGREEN contained within the pre-filter cartridges. When media is more than 85% clogged replacement is required.

 Excessive accumulation of sediment on the BioMediaGREEN media housed within the drain down filter. The following photos show of the condition of the BioMediaGREEN contained within the drain down filter. When media is more than 85% clogged replacement is required.

0% -- Percent Clogged -- 100% New
BioMediaGREEN
Exhausted
BioMediaGREEN
85%

www.modularwetlands.com

 Overgrown vegetation.

 Water level in discharge chamber during 100% operating capacity (pre-treatment chamber water level at max height) is lower than the watermark by 20%.

www.modularwetlands.com

Inspection Notes

1. Following maintenance and/or inspection, it is recommended the maintenance operator prepare a maintenance/inspection record. The record should include any maintenance activities performed, amount and description of debris collected, and condition of the system and its various filter mechanisms.

2. The owner should keep maintenance/inspection record(s) for a minimum of five years from the date of maintenance. These records should be made available to the governing municipality for inspection upon request at any time.

3. Transport all debris, trash, organics and sediments to approved facility for disposal in accordance with local and state requirements.

4. Entry into chambers may require confined space training based on state and local regulations.

5. No fertilizer shall be used in the Biofiltration Chamber.

6. Irrigation should be provided as recommended by manufacturer and/or landscape architect. Amount of irrigation required is dependent on plant species. Some plants may not require irrigation after initial establishment.

www.modularwetlands.com

Maintenance Guidelines for
Modular Wetland System - Linear

Maintenance Summary

o Remove Sediment from Pre-Treatment Chamber – average maintenance interval is 12 to 24 months.
 (10 minute average service time).
o Replace Pre-Filter Cartridge Media – average maintenance interval 12 to 24 months.  (10-15 minute per cartridge average service time).
o Trim Vegetation – average maintenance interval is 6 to 12 months.  (Service time varies).

System Diagram

Access to separation chamber
and pre-filter cartridge
1 Pre-treatment Chamber
2 Biofiltration Chamber
3 Discharge Chamber

www.modularwetlands.com

Maintenance Overview

The time has come to maintain your Modular Wetland System Linear (MWS Linear). To ensure successful and efficient maintenance on the system we recommend the following. The MWS Linear can be maintained by removing the access hatches over the systems various chambers. All necessary pre-maintenance steps must be carried out before maintenance occurs, especially traffic control and other safety measures to protect the inspector and near-by pedestrians from any dangers associated with an open access hatch or manhole. Once traffic control has been set up per local and state regulations and access covers have been safely opened the maintenance process can begin. It should be noted that some maintenance activities require confined space entry. All confined space requirements must be strictly followed before entry into the system. In addition the following is recommended:

 Prepare the maintenance form by writing in the necessary information including project name, location, date & time, unit number and other info (see maintenance form).  Set up all appropriate safety and cleaning equipment.  Ensure traffic control is set up and properly positioned.  Prepare a pre-checks (OSHA, safety, confined space entry) are performed.

Maintenance Equipment

Following is a list of equipment required for maintenance of the MWS Linear:
 Modular Wetland Maintenance Form
 Manhole hook or appropriate tools to access hatches and covers  Protective clothing, flashlight and eye protection.
 7/16” open or closed ended wrench.
 Vacuum assisted truck with pressure washer.
 Replacement BioMediaGREEN for Pre-Filter Cartridges if required (order from manufacturer).

www.modularwetlands.com

Maintenance Steps

1. Pre-treatment Chamber (bottom of chamber)

A. Remove access hatch or manhole cover over pre-treatment chamber and position vacuum truck accordingly.

B. With a pressure washer spray down pollutants accumulated on walls and pre-filter cartridges.

C. Vacuum out Pre-Treatment Chamber and remove all accumulated pollutants including trash, debris and sediments. Be sure to vacuum the floor until pervious pavers are visible and clean.

D. If Pre-Filter Cartridges require media replacement move onto step 2. If not, replace access hatch or manhole cover.

Removal of access hatch to gain access below. Insertion of vacuum hose into separation chamber.

Removal of trash, sediment and debris. Fully cleaned separation chamber.

www.modularwetlands.com

2. Pre-Filter Cartridges (attached to wall of pre-treatment chamber)

A. After finishing step 1 enter pre-treatment chamber.

B. Unscrew the two bolts holding the lid on each cartridge filter and remove lid.

C. Place the vacuum hose over each individual media filter to suck out filter media.

D. Once filter media has been sucked use a pressure washer to spray down inside of the cartridge and it’s containing media cages. Remove cleaned media cages and place to the side. Once removed the vacuum hose can be inserted into the cartridge to vacuum out any remaining material near the bottom of the cartridge.

Pre-filter cartridges with tops on.

Inside cartridges showing media filters ready for
replacement.

Vacuuming out of media filters.

www.modularwetlands.com

E. Reinstall media cages and fill with new media from manufacturer or outside supplier.

Manufacturer will provide specification of media and sources to purchase. Utilize the manufacture provided refilling trey and place on top of cartridge. Fill trey with new bulk media and shake down into place. Using your hands slightly compact media into each filter cage. Once cages are full removed refilling trey and replace cartridge top ensuring bolts are properly tightened.

F. Exit pre-treatment chamber. Replace access hatch or manhole cover.

3. Biofiltration Chamber (middle vegetated chamber)

A. In general, the biofiltration chamber is maintenance free with the exception of maintaining the vegetation. Using standard gardening tools properly trim back the vegetation to healthy levels. The MWS Linear utilizes vegetation similar to surrounding landscape areas therefore trim vegetation to match surrounding vegetation. If any plants have died replace plants with new ones:

Refilling trey for media replacement. Refilling trey on cartridge with bulk media.

www.modularwetlands.com

4. Discharge Chamber (contains drain down cartridge & connected to pipe)

A. Remove access hatch or manhole cover over discharge chamber.

B. Enter chamber to gain access to the drain down filter. Unlock the locking mechanism and left up drain down filter housing to remove used BioMediaGREEN filter block as shown below:

C. Insert new BioMediaGREEN filter block and lock drain down filter housing back in place.

Replace access hatch or manhole cover over discharge chamber.

www.modularwetlands.com

Inspection Notes

3. Transport all debris, trash, organics and sediments to approved facility for disposal in accordance with local and state requirements.

4. Entry into chambers may require confined space training based on state and local regulations.

5. No fertilizer shall be used in the Biofiltration Chamber.

www.modularwetlands.com

Inspection Form

Modular Wetland System, Inc.

P. 760.433-7640
F. 760-433-3176
E. [email protected]

www.modularwetlands.com

Maintenance Report

Modular Wetland System, Inc.

P. 760.433-7640
F. 760-433-3176
E. [email protected]

City of San Marcos PDP SWQMP Template Date: March 15, 2016 PDP SWQMP Preparation Date: November 18, 2022
ATTACHMENT 4
Copy of Plan Sheets Showing Permanent Storm Water BMPs

This is the cover sheet for Attachment 4.

Use this checklist to ensure the required information has been included on the plans:

The plans must identify:

 Structural BMP(s) with ID numbers matching Form I-6 Summary of PDP Structural BMPs  The grading and drainage design shown on the plans must be consistent with the delineation of DMAs shown on the DMA exhibit
 Details and specifications for construction of structural BMP(s)  Signage indicating the location and boundary of structural BMP(s) as required by the [City Engineer] How to access the structural BMP(s) to inspect and perform maintenance Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds)
Manufacturer and part number for proprietary parts of structural BMP(s) when applicable Maintenance thresholds specific to the structural BMP(s), with a location-specific frame of reference (e.g., level of accumulated materials that triggers removal of the materials, to be identified based on viewing marks on silt posts or measured with a survey rod with respect to a fixed benchmark within the BMP)
Recommended equipment to perform maintenance
When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management Include landscaping plan sheets showing vegetation requirements for vegetated structural BMP(s)  All BMPs must be fully dimensioned on the plans
When proprietary BMPs are used, site-specific cross section with outflow, inflow, and model number shall be provided. Photocopies of general brochures are not acceptable.

K
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T S R Q
FF=532.25FF=532.5FF=532.75FF=533.75
FF=533.75
FF=533.25
FF=533.65PAD=532.98
FF=533.88PAD=533.21 FF=535.75PAD=535.08FF=535.17PAD=534.50FF=534.67PAD=534.00FF=533.56PAD=532.89 FF=533.21PAD=532.54
PAD=532.00FF=533.65PAD=532.98FF=533.32PAD=532.65
FF=533.88PAD=533.21
FF=533.98PAD=533.31
FF=533.98PAD=533.31 FF=535.50PAD=534.83
FF=533.15PAD=532.48FF=533.40PAD=532.73FF=532.65PAD=531.98 FF=532.40PAD=531.73FF=532.76PAD=532.09FF=533.05PAD=532.38FF=533.47PAD=532.80 Planning I Landscape Architecture | Engineering I Survey PREPARED BY:SHEETOF
SDP:22-0006
C10.0VESTING TENTATIVE SUBDIVISION MAP/SAN MARCOS RESTAURANT ROWW. SAN MARCOS BLVD. AND VIA VERA CRUZCITY OF SAN MARCOS, CALIFORNIASITE DEVELOPMENT PLAN TSM: 22-0003R: 22-0002GPA: 22-0002SP: 22-0004
C7.0SITE GRADING & DRAINAGE PLAN

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4 cubic yard bin @6'-9" x4'-6"
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FF=536.38PAD=535.71 FF=537.62PAD=536.95
FF=533.30PAD=532.68
FF=535.38PAD=534.71
FF=533.30PAD=532.63
FF=535.37PAD=534.70FF=535.37PAD=534.70FF=535.95PAD=535.28 FF=533.87PAD=533.20FF=533.87PAD=533.20FF=534.45PAD=533.78 FF=536.13PAD=535.46
FF=535.50PAD=534.83
FF=535.70PAD=535.03
FF=533.21PAD=532.54
FF=534.19PAD=533.52
FF=534.77PAD=534.10FF=534.19PAD=533.52
FF=534.77PAD=534.10FF=534.10PAD=533.43FF=535.28PAD=534.61FF=535.28PAD=534.61 FF=536.84PAD=536.17FF=537.42PAD=536.75
FF=536.75PAD=536.08FF=536.75PAD=536.08
FF=533.78PAD=533.11FF=533.78PAD=533.11
FF=534.98PAD=534.31FF=534.98PAD=534.31FF=535.56PAD=534.89 FF=534.89PAD=534.22FF=535.89PAD=534.22
FF=536.38PAD=535.71FF=536.95PAD=536.28FF=537.95PAD=537.28 FF=533.88PAD=533.21FF=533.88PAD=533.21
FF=533.88PAD=533.21
FF=534.77PAD=534.10
FF=534.77PAD=534.10
FF=535.95PAD=535.28
FF=535.95PAD=535.28
FF=534.45PAD=533.78
FF=534.45PAD=533.78
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FF=535.56PAD=534.89
FF=537.42PAD=536.75
FF=537.42PAD=536.75
FF=536.84PAD=536.17
FF=537.37PAD=536.70FF=535.35PAD=534.68FF=535.68PAD=535.01FF=536.95PAD=536.28FF=536.97PAD=536.28FF=537.62PAD=534.83FF=537.62PAD=536.95 FF=535.50PAD=534.83
Planning I Landscape Architecture | Engineering I Survey PREPARED BY:SHEETOF
SDP:22-0006
C10.0VESTING TENTATIVE SUBDIVISION MAP/SAN MARCOS RESTAURANT ROWW. SAN MARCOS BLVD. AND VIA VERA CRUZCITY OF SAN MARCOS, CALIFORNIASITE DEVELOPMENT PLAN TSM: 22-0003R: 22-0002GPA: 22-0002SP: 22-0004
C7.1SITE GRADING & DRAINAGE PLAN

Planning I Landscape Architecture | Engineering I Survey PREPARED BY:SHEETOF
SDP:22-0006
C10.0VESTING TENTATIVE SUBDIVISION MAP/SAN MARCOS RESTAURANT ROWW. SAN MARCOS BLVD. AND VIA VERA CRUZCITY OF SAN MARCOS, CALIFORNIASITE DEVELOPMENT PLAN TSM: 22-0003R: 22-0002GPA: 22-0002SP: 22-0004
C8.0GRADING & DRAINAGE DETAILS

O
Planning I Landscape Architecture | Engineering I Survey PREPARED BY:SHEETOF
SDP:22-0006
C10.0VESTING TENTATIVE SUBDIVISION MAP/SAN MARCOS RESTAURANT ROWW. SAN MARCOS BLVD. AND VIA VERA CRUZCITY OF SAN MARCOS, CALIFORNIASITE DEVELOPMENT PLAN TSM: 22-0003R: 22-0002GPA: 22-0002SP: 22-0004
C8.1GRADING & DRAINAGE DETAILS

City of San Marcos PDP SWQMP Template Date: March 15, 2016 PDP SWQMP Preparation Date: November 18, 2022
ATTACHMENT 5
PDP-Exempt Green Street Memo for San Marcos Blvd Frontage Improvements

P:\4457\Engr\Reports\SWQMP\GREEN STREETS\Green Street Exemption Memo.docx

DATE: November 18, 2022 FILE: 4457.00

TO: City of San Marcos

FROM: Chelisa Pack, Project Design Consultants

SUBJECT: Restaurant Row (SP22-0004 GPA22-0002 R22-0002 TSM 22-0003 SDP 22-0006)- PDP-Exempt Green Street Report Memo for P ublic Improvements of San Marcos Blvd

This report supports the PDP-exempt stormwater requ irements for the development of the public offsite street improvements for San Marcos Boulevard for the Restaurant Row project. The project proposes to construct some public improvements and street widening along the project frontage.

These public improvements include center median imp rovements, and a new side median for multi-way traffic improvement lanes in San Marcos B oulevard. The water quality requirements for the onsite improvements within the Restaurant R ow project are addressed in a separate report entitled PDP SWQMP for San Marcos Restaurant Row pr epared by PDC. The purpose of this Green Street PDP-Exempt report is to summarize the water quality design approach as a “Green Street” project for the roadway improvements. Pursuing the Green Street Approach for the offsite Public Improvements, the offsite improvements will be exempt from Priority Development Project (PDP) designation, and hydromodification requirements do not apply.

The project proposes street widening and new median improvements. San Marcos Blvd will not be significantly re-graded with the exception of ro ad widening and the multi-way traffic improvements. Based on the coordination with the G eotechnnical Engineer from Geocon, the infiltration feasibility evaluation (and I-8 Form) for the onsite project also applies to the offsite area, due to similar soil conditions. Due to the nature of the project and site constraints, infiltration of stormwater is not desirable, and could increase the risk of pavement distress. The Green Streets approach for the proposed San Marcos Blvd public im provements focuses on implementing vegetated planters with curb cuts to accept gutter runoff where feasible. A portion of San Marcos Blvd to be disturbed will be treated in the vegetat ed planters that drains westerly in San Marcos Blvd. Street trees will also be planted in the park way and median to enhance canopy interception and reduce the proposed imperviousness.

See Attachment A for the vegetated planter sizing calculations. Although green street requirements are not subject to the same BMP sizing requirements as PDP projects, planter design is based on the County of San Diego Stormwater Pollutant Control Worksheets. The planter on the most west end with the biggest DMA area (worst case scenario) was analyzed. The calculations are included in Attachment A. The calculations show that the sel ected planters have the ability to treat runoff from the DMA draining into the planters.

Since the proposed biofiltration planters in the median are treating public runoff, it is expected that the biofiltration planters will be public and publi cally maintained by the City of San Marcos.

Anticipated maintenance measures include landscapin g management, removal of trash and sediment, replacement of mulch, and maintenance of overflow grates and underdrains.

ATTACHMENT A – BMP SIZING

CITY OF SAN MARCOSRESTAURANT ROW

Category # Description i Units
1 Drainage Basin ID or Name 1 unitless
2 85th Percentile 24-hr Storm Depth 0.67 inches
3 Impervious Surfaces Not Directed to Dispersion Area (C=0.90) 6,095 sq-ft 4 Semi-Pervious Surfaces Not Serving as Dispersion Area (C=0.30) sq-ft 5 Engineered Pervious Surfaces Not Serving as Dispersion Area (C=0.10) 677 sq-ft 6 Natural Type A Soil Not Serving as Dispersion Area (C=0.10) sq-ft 7 Natural Type B Soil Not Serving as Dispersion Area (C=0.14) sq-ft 8 Natural Type C Soil Not Serving as Dispersion Area (C=0.23) sq-ft 9 Natural Type D Soil Not Serving as Dispersion Area (C=0.30) sq-ft 10 Does Tributary Incorporate Dispersion, Tree Wells, and/or Rain Barrels? No yes/no 11 Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90) sq-ft 12 Semi-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30) sq-ft 13 Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.10) sq-ft 14 Natural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10) sq-ft 15 Natural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14) sq-ft 16 Natural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23) sq-ft 17 Natural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30) sq-ft 18 Number of Tree Wells Proposed per SD-A #
19 Average Mature Tree Canopy Diameter ft
20 Number of Rain Barrels Proposed per SD-E #
21 Average Rain Barrel Size gal
22 Total Tributary Area 6,772 sq-ft
23 Initial Runoff Factor for Standard Drainage Areas 0.82 unitless 24 Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 unitless 25 Initial Weighted Runoff Factor 0.82 unitless
26 Initial Design Capture Volume 310 cubic-feet
27 Total Impervious Area Dispersed to Pervious Surface 0 sq-ft 28 Total Pervious Dispersion Area 0 sq-ft
29 Ratio of Dispersed Impervious Area to Pervious Dispersion Area n/a ratio 30 Adjustment Factor for Dispersed & Dispersion Areas 1.00 ratio 31 Runoff Factor After Dispersion Techniques 0.82 unitless 32 Design Capture Volume After Dispersion Techniques 310 cubic-feet 33 Total Tree Well Volume Reduction 0 cubic-feet
34 Total Rain Barrel Volume Reduction 0 cubic-feet
35 Final Adjusted Runoff Factor 0.82 unitless
36 Final Effective Tributary Area 5,553 sq-ft
37 Initial Design Capture Volume Retained by Site Design Elements 0 cubic-feet 38 Final Design Capture Volume Tributary to BMP 310 cubic-feet False
False
Automated Worksheet B.1: Calculation of Design Capture Volume (V2.0) Dispersion
Area, Tree Well
& Rain Barrel
Inputs
(Optional)
Standard
Drainage Basin
Inputs
Results
Tree & Barrel
Adjustments
Initial Runoff
Factor
Calculation
Dispersion
Area
Adjustments
No Warning Messages
Category # Description i Units
1 Drainage Basin ID or Name 1 unitless
2 85th Percentile Rainfall Depth 0.67 inches
3 Predominant NRCS Soil Type Within BMP Location C unitless 4 Is proposed BMP location Restricted or Unrestricted for Infiltration Activities? Restricted unitless 5 Nature of Restriction Groundwater unitless
6 Do Minimum Retention Requirements Apply to this Project? Yes yes/no 7 Are Habitable Structures Greater than 9 Stories Proposed? No yes/no 8 Has Geotechnical Engineer Performed an Infiltration Analysis? No yes/no 9 Design Infiltration Rate Recommended by Geotechnical Engineer in/hr 10 Design Infiltration Rate Used To Determine Retention Requirements 0.000 in/hr 11 Percent of Average Annual Runoff that Must be Retained within DMA 1.5% percentage 12 Fraction of DCV Requiring Retention 0.01 ratio
13 Required Retention Volume 3 cubic-feet
False
False
Automated Worksheet B.2: Retention Requirements (V2.0)
Advanced
Analysis
Basic Analysis
Result
No Warning Messages
Category # Description i Units
1 Drainage Basin ID or Name 1 sq-ft
2 Design Infiltration Rate Recommended 0.000 in/hr
3 Design Capture Volume Tributary to BMP 310 cubic-feet 4 Is BMP Vegetated or Unvegetated? Vegetated unitless
5 Is BMP Impermeably Lined or Unlined? Lined unitless
6 Does BMP Have an Underdrain? Underdrain unitless
7 Does BMP Utilize Standard or Specialized Media? Standard unitless 8 Provided Surface Area 165 sq-ft
9 Provided Surface Ponding Depth 4 inches
10 Provided Soil Media Thickness 21 inches
11 Provided Gravel Thickness (Total Thickness) 15 inches 12 Underdrain Offset 3 inches
13 Diameter of Underdrain or Hydromod Orifice (Select Smallest) 8.00 inches 14 Specialized Soil Media Filtration Rate in/hr
15 Specialized Soil Media Pore Space for Retention unitless 16 Specialized Soil Media Pore Space for Biofiltration unitless 17 Specialized Gravel Media Pore Space unitless
18 Volume Infiltrated Over 6 Hour Storm 0 cubic-feet
19 Ponding Pore Space Available for Retention 0.00 unitless 20 Soil Media Pore Space Available for Retention 0.05 unitless 21 Gravel Pore Space Available for Retention (Above Underdrain) 0.00 unitless 22 Gravel Pore Space Available for Retention (Below Underdrain) 0.40 unitless 23 Effective Retention Depth 2.25 inches
24 Fraction of DCV Retained (Independent of Drawdown Time) 0.10 ratio 25 Calculated Retention Storage Drawdown Time 120 hours 26 Efficacy of Retention Processes 0.12 ratio
27 Volume Retained by BMP (Considering Drawdown Time) 37 cubic-feet 28 Design Capture Volume Remaining for Biofiltration 273 cubic-feet 29 Max Hydromod Flow Rate through Underdrain 2.7872 cfs 30 Max Soil Filtration Rate Allowed by Underdrain Orifice 729.74 in/hr 31 Soil Media Filtration Rate per Specifications 5.00 in/hr 32 Soil Media Filtration Rate to be used for Sizing 5.00 in/hr 33 Depth Biofiltered Over 6 Hour Storm 30.00 inches
34 Ponding Pore Space Available for Biofiltration 1.00 unitless 35 Soil Media Pore Space Available for Biofiltration 0.20 unitless 36 Gravel Pore Space Available for Biofiltration (Above Underdrain) 0.40 unitless 37 Effective Depth of Biofiltration Storage 13.00 inches 38 Drawdown Time for Surface Ponding 1 hours
39 Drawdown Time for Effective Biofiltration Depth 3 hours 40 Total Depth Biofiltered 43.00 inches
41 Option 1 - Biofilter 1.50 DCV: Target Volume 409 cubic-feet 42 Option 1 - Provided Biofiltration Volume 409 cubic-feet 43 Option 2 - Store 0.75 DCV: Target Volume 204 cubic-feet 44 Option 2 - Provided Storage Volume 179 cubic-feet
45 Portion of Biofiltration Performance Standard Satisfied 1.00 ratio 46 Do Site Design Elements and BMPs Satisfy Annual Retention Requirements? Yes yes/no 47 Overall Portion of Performance Standard Satisfied (BMP Efficacy Factor) 1.00 ratio 48 Deficit of Effectively Treated Stormwater
0 cubic-feet
Retention
Calculations
Automated Worksheet B.3: BMP Performance (V2.0)
False
False
BMP Inputs
Biofiltration
Calculations
False
- BMPs sized at <3% of the effective tributary areas must be accompanied by Reduced Size BMP Maintenance calculations (see last tab).

False
False
Result
False
False
Attention!
Category # Description i Units
1 Drainage Basin ID or Name 1 unitless
2 Final Effective Tributary Area 5,553 sq-ft
3 Provided BMP Surface Area 165 sq-ft
4 Average Annual Precipitation 10.0 inches
5 Load to Clog (default =2.0) 2.0 lb/sq-ft
6 TSS Pretreatment Efficacy yes/no
7 Percentage "Commercial" percentage
8 Percentage "Education" percentage
9 Percentage "Industrial" percentage
10 Percentage "Low Traffic Areas" percentage
11 Percentage "Multi-Family Residential" percentage
12 Percentage "Roof Areas" percentage
13 Percentage "Single Family Residential" percentage
14 Percentage "Transportation" 90% percentage
15 Percentage "Vacant/Open Space" 10% percentage
16 Percentage "Steep Hillslopes" percentage
17 Total Percentage of Above Land Uses 100% percentage
18 Average TSS Concentration for Tributary After Pretreatment 65 mg/L 19 Average Annual Runoff Volume 4,628 cubic-feet
20 Average Annual TSS Load 19 lb/yr
21 Available Sediment Storage within BMP 330 lb
22 Anticipated Major Maintenance Frequency 17.6 years
False
False
Automated Worksheet B.4: Reduced Size BMP Maintenance Interval (V2.0) Drainage Basin
Info
Biofiltration
Clogging
Inputs
No Warning Messages
Result

San Marcos City CouncilDecember 12, 2023

San Marcos City Council
December 12, 2023