HomeMy WebLinkAboutSDP 2022-0003; FPC RESIDENTIAL; PRIORITY DEVELOPMENT PROJECT STORM WATER QUALITY MANAGEMENT PLAN; 2024-03-13E-35 REV 04/23
Development Services
Land Development Engineering
1635 Faraday Avenue
442-339-2750
www.carlsbadca.gov
STORM WATER QUALITY MANAGEMENT PLAN (SWQMP)
CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR
[INSERT DRAWING No. (DWG ___-__)]
[INSERT GR No. _________]
ENGINEER OF WORK:
PREPARED FOR:
PREPARED BY:
DATE:
FPC RESIDENTIAL
PROJECT ID: SDP2022-0003, CDP2022-0023
TYLER G. LAWSON, PE # 80356
H.G. FENTON COMPANY
7577 MISSION VALLEY ROAD
SAN DIEGO, CA 92108
(619) 400-1034
PASCO LARET SUITER & ASSOCIATES
1911 SAN DIEGO AVE., SUITE 100
SAN DIEGO, CA 92110
(858) 259-8212
JUNE 7, 2023
REVISED:
JANUARY 26, 2024
MARCH 13, 2024
TABLE OF CONTENTS
Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire
Site Information FORM E-36 Standard Project Requirement Checklist Summary of PDP Structural BMPs Attachment 1: Backup for PDP Pollutant Control BMPs Attachment 1a: DMA Exhibit Attachment 1b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment 1c: Harvest and Use Feasibility Screening (when applicable) Attachment 1d: Infiltration Feasibility Analysis (when applicable) Attachment 1e: Pollutant Control BMP Design Worksheets / Calculations Attachment 1f: Trash Capture BMP Requirements Attachment 2: Backup for PDP Hydromodification Control Measures
Attachment 2a: Hydromodification Management Exhibit Attachment 2b: Management of Critical Coarse Sediment Yield Areas Attachment 2c: Geomorphic Assessment of Receiving Channels
Attachment 2d: Flow Control Facility Design Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit
CERTIFICATION PAGE Project Name: Project ID:
I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land
development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my
responsibilities for project design.
________________________________________________________ Engineer of Work's Signature, PE Number & Expiration Date ________________________________________________________ Print Name ________________________________________________________ Company
____________________________
Date
FPC RESIDENTIAL
SDP 2022-0003
PROJECT VICINITY MAP
PROJECT SITE
Page 1 of 4 REV 04/23 E-34
To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5).
This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to ‘STANDARD PROJECT’ requirements, “PRIORITY DEVELOPMENT PROJECT (PDP) requirements or not considered a development project. This questionnaire will also determine if the project is subject to TRASH CAPTURE REQUIREMENTS.
Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city.
If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff.
A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently.
PROJECT INFORMATION
PROJECT NAME: APN:
ADDRESS:
The project is (check one): New Development Redevelopment
The total proposed disturbed area is: ft2 ( ) acres
The total proposed newly created and/or replaced impervious area is: ft2 ( ) acres
If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project:
Project ID SWQMP #:
Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city.
This Box for City Use Only
City Concurrence:
YES NO Date: Project ID:
By:
Development Services
Land Development Engineering
1635 Faraday Avenue 442-339-2750www.carlsbadca.gov
STORM WATER STANDARDS
QUESTIONNAIRE E-34
INSTRUCTIONS:
E-34 Page 2 of 4 REV 04/23
STEP 1 TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a “development project”, please answer the following question: YES NO
Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)?
If you answered “yes” to the above question, provide justification below then go to Step 6, mark the box stating “my project
is not a ‘development project’ and not subject to the requirements of the BMP manual” and complete applicant information.
Justification/discussion: (e.g. the project includes only interior remodels within an existing building):
If you answered “no” to the above question, the project is a ‘development project’, go to Step 2.
STEP 2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS
To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions:
Is your project LIMITED to one or more of the following: YES NO
1.Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria:a)Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; ORb)Designed and constructed to be hydraulically disconnected from paved streets or roads; OR
c)Designed and constructed with permeable pavements or surfaces in accordance with USEPAGreen Streets guidance?
2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed inaccordance with the USEPA Green Streets guidance?
3.Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual?
If you answered “yes” to one or more of the above questions, provide discussion/justification below, then go to Step 6, mark the second box stating “my project is EXEMPT from PDP …” and complete applicant information.
Discussion to justify exemption (e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance):
If you answered “no” to the above questions, your project is not exempt from PDP, go to Step 3.
E-34 Page 3 of 4 REV 04/23
* Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of SpecialBiological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodiesdesignated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat ManagementPlan; and any other equivalent environmentally sensitive areas which have been identified by the City.
STEP 3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)):
YES NO
1. Is your project a new development that creates 10,000 square feet or more of impervious surfacescollectively over the entire project site? This includes commercial, industrial, residential, mixed-use,and public development projects on public or private land.
2. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of impervious
surface collectively over the entire project site on an existing site of 10,000 square feet or more ofimpervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land.
3. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more ofimpervious surface collectively over the entire project site and supports a restaurant? A restaurant is a
facility that sells prepared foods and drinks for consumption, including stationary lunch counters and refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812).
4. Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious
surface collectively over the entire project site and supports a hillside development project? A hillsidedevelopment project includes development on any natural slope that is twenty-five percent or greater.
5. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more ofimpervious surface collectively over the entire project site and supports a parking lot? A parking lot is a
land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce.
6. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or moreof impervious street, road, highway, freeway or driveway surface collectively over the entire projectsite? A street, road, highway, freeway or driveway is any paved impervious surface used for the
transportation of automobiles, trucks, motorcycles, and other vehicles. 7. Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more ofimpervious surface collectively over the entire site, and discharges directly to an EnvironmentallySensitive Area (ESA)? “Discharging Directly to” includes flow that is conveyed overland a distance of 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from the project to the ESA (i.e. not commingled with flows from adjacent lands).*
8.Is your project a new development or redevelopment project that creates and/or replaces 5,000 squarefeet or more of impervious surface that supports an automotive repair shop? An automotive repair
shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC)codes: 5013, 5014, 5541, 7532-7534, or 7536-7539.
9. Is your project a new development or redevelopment project that creates and/or replaces 5,000 squarefeet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includesRGO’s that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (ADT) of 100 or more vehicles per day.
10. Is your project a new or redevelopment project that results in the disturbance of one or more acres of landand are expected to generate pollutants post construction?
11. Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of
impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC21.203.040)
If you answered “yes” to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, complete the trash capture question.
If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT’. Go to step 5, complete the trash capture question.
E-34 Page 4 of 4 REV 04/23
STEP 4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY
Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): YES NO
Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below:
Existing impervious area (A) = sq. ft.
Total proposed newly created or replaced impervious area (B) = sq. ft.
Percent impervious area created or replaced (B/A)*100 = %
If you answered “yes”, the structural BMPs required for PDP apply only to the creation or replacement of impervious surface
and not the entire development. Go to step 5, complete the trash capture question.
If you answered “no,” the structural BMP’s required for PDP apply to the entire development. Go to step 5, complete the
trash capture question.
STEP 5 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS
Complete the question below regarding your Project (SDRWQCB Order No. 2017-0077):
YES NO
Is the Project within any of the following Priority Land Use (PLU) categories?
R-23 (15-23 du/ac), R-30 (23-30 du/ac), PI (Planned Industrial), CF (Community Facilities), GC (General
Commercial), L (Local Shopping Center), R (Regional Commercial), V-B (Village-Barrio), VC (VisitorCommercial), O (Office), VC/OS (Visitor Commercial/Open Space), PI/O (Planned Industrial/Office), or
Public Transportation Station
If you answered “yes”, the ‘PROJECT’ is subject to TRASH CAPTURE REQUIREMENTS. Go to step 6, check the first box stating, “My project is subject to TRASH CAPTURE REQUIREMENTS …” and the second or third box as determined in step 3.
If you answered “no”, Go to step 6, check the second or third box as determined in step 3.
STEP 6 CHECK THE APPROPRIATE BOX(ES) AND COMPLETE APPLICANT INFORMATION
My project is subject to TRASH CAPTURE REQUIREMENTS and must comply with TRASH CAPTURE REQUIREMENTS of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP).
My project is a ‘STANDARD PROJECT’ OR EXEMPT from PDP and must only comply with ‘STANDARD PROJECT’ stormwater requirements of the BMP Manual. As part of these requirements, I will submit a “Standard Project
Requirement Checklist Form E-36” and incorporate low impact development strategies throughout my project. If my project is subject to TRASH CAPTURE REQUIREMENTS, I will submit a TRASH CAPTURE Storm Water Quality Management Plan (TCSWQMP) per E-35A.
My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) per E-35 template for submittal at time of application.
Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations and exhibits to verify if ‘STANDARD PROJECT’ stormwater requirements apply.
My project is NOT a ‘development project’ and is not subject to the requirements of the BMP Manual.
Applicant Information and Signature Box
Applicant Name: Applicant Title:
Applicant Signature: Date:
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name
Project ID
Project Address
Assessor's Parcel Number(s) (APN(s))
Project Watershed (Hydrologic Unit) Carlsbad 904
Parcel Area ________ Acres (____________ Square Feet)
Existing Impervious Area
(subset of Parcel Area) ________ Acres (____________ Square Feet)
Area to be disturbed by the project
(Project Area) ________ Acres (____________ Square Feet)
Project Proposed Impervious Area
(subset of Project Area) ________ Acres (____________ Square Feet)
Project Proposed Pervious Area
(subset of Project Area) ________ Acres (____________ Square Feet)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This area includes but is not limited to off-site work including public improvements and temporary disturbance such as vehicle and equipment staging areas, construction worker foot traffic, soil/gravel piles, utility trenches, backfill cuts and slope keyways.
Description of Existing Site Condition and Drainage Patterns
Current Status of the Site (select all that apply):
Existing development
Previously graded but not built out
Agricultural or other non-impervious use
Vacant, undeveloped/natural
Description / Additional Information:
Existing Land Cover Includes (select all that apply):
Vegetative Cover
Non-Vegetated Pervious Areas
Impervious Areas
Description / Additional Information:
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
NRCS Type A
NRCS Type B
NRCS Type C
NRCS Type D
Approximate Depth to Groundwater (GW):
GW Depth < 5 feet
5 feet < GW Depth < 10 feet
10 feet < GW Depth < 20 feet
GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
Watercourses
Seeps
Springs
Wetlands
None
Description / Additional Information:
Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from
the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]:
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
List/describe proposed pervious features of the project (e.g., landscape areas):
Does the project include grading and changes to site topography?
Yes
No Description / Additional Information:
Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)?
Yes
No
Description / Additional Information:
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
On-site storm drain inlets
Interior floor drains and elevator shaft sump pumps
Interior parking garages
Need for future indoor & structural pest control
Landscape/Outdoor Pesticide Use
Pools, spas, ponds, decorative fountains, and other water features
Food service
Refuse areas
Industrial processes
Outdoor storage of equipment or materials
Vehicle and Equipment Cleaning
Vehicle/Equipment Repair and Maintenance
Fuel Dispensing Areas
Loading Docks
Fire Sprinkler Test Water
Miscellaneous Drain or Wash Water
Plazas, sidewalks, and parking lots
Identification of Receiving Water Pollutants of Concern
Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or
reservoir, as applicable):
List any 303(d) impaired water bodies within the path of storm water from the project site to the
Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies:
303(d) Impaired Water Body Pollutant(s)/Stressor(s) TMDLs
Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see Table B.6-1 below):
Pollutant Not Applicable to the Project Site Anticipated from the Project Site
Also a Receiving Water Pollutant of Concern
Sediment
Nutrients
Heavy Metals
Organic Compounds
Trash & Debris
Oxygen Demanding Substances
Oil & Grease
Bacteria & Viruses
Pesticides
TABLE Error! No text of specified style in document.-1. Anticipated and Potential Pollutants Generated
by Land Use Type
General Pollutant Categories
Priority
Project
Categories
Sediment Nutrients Heavy
Metals
Organic
Compounds
Trash &
Debris
Oxygen
Demanding
Substances
Oil &
Grease
Bacteria &
Viruses Pesticides
Detached
Residential
Development
X X X X X X X
Attached
Residential
Development
X X X P(1) P(2) P X
Commercial
Development >one acre P(1) P(1) X P(2) X P(5) X P(3) P(5)
Heavy
Industry X X X X X X
Automotive Repair Shops X X(4)(5) X X
Restaurants X X X X P(1)
Hillside
Development
>5,000 ft2
X X X X X X
Parking Lots P(1) P(1) X X P(1) X P(1)
Retail
Gasoline
Outlets
X X X X X
Streets,
Highways &
Freeways
X P(1) X X(4) X P(5) X X P(1)
X = anticipated
P = potential
(1) A potential pollutant if landscaping exists onsite.
(2) A potential pollutant if the project includes uncovered parking areas.
(3) A potential pollutant if land use involves food or animal waste products.
(4) Including petroleum hydrocarbons.
(5) Including solvents.
Trash Capture BMP Requirements
The project must meet the following Trash Capture BMP Requirements (see Section 4.4 of the
BMP Design Manual): 1) The trash capture BMP is sized for a one-year, one-hour storm event or equivalent storm drain system, and 2) the trash capture BMP captures trash equal or greater to 5mm.
Description / Discussion of Trash Capture BMPs:
Hydromodification Management Requirements
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)?
Yes, hydromodification management flow control structural BMPs required.
No, the project will discharge runoff directly to existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean.
No, the project will discharge runoff directly to conveyance channels whose bed and bank are concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean.
No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA for the watershed in which the project resides.
Description / Additional Information (to be provided if a 'No' answer has been selected above):
Critical Coarse Sediment Yield Areas* *This Section only required if hydromodification management requirements apply
Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries?
Yes
No, no critical coarse sediment yield areas to be protected based on WMAA maps
If yes, have any of the optional analyses presented in Appendix H of the manual been performed?
H.6.1 Site-Specific GLU Analysis
H.7 Downstream Systems Sensitivity to Coarse Sediment
H.7.3 Coarse Sediment Source Area Verification
No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps
If optional analyses were performed, what is the final result?
No critical coarse sediment yield areas to be protected based on verification of GLUs onsite.
Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP.
Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections H.2, H.3, and H.4 as applicable, and the areas
are identified on the SWQMP Exhibit.
Discussion / Additional Information:
Flow Control for Post-Project Runoff* *This Section only required if hydromodification management requirements apply
List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number
correlating to the project's HMP Exhibit.
Has a geomorphic assessment been performed for the receiving channel(s)?
No, the low flow threshold is 0.1Q2 (default low flow threshold)
Yes, the result is the low flow threshold is 0.1Q2
Yes, the result is the low flow threshold is 0.3Q2
Yes, the result is the low flow threshold is 0.5Q2
If a geomorphic assessment has been performed, provide title, date, and preparer:
Discussion / Additional Information: (optional)
Other Site Requirements and Constraints
When applicable, list other site requirements or constraints that will influence storm water
management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements.
Optional Additional Information or Continuation of Previous Sections As Needed
This space provided for additional information or continuation of information from previous sections as needed.
E-36 Page 1 of 4 Revised 04/23
Development Services
Land Development Engineering
1635 Faraday Avenue
442-339-2750
www.carlsbadca.gov
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Project Name:
Project ID:
DWG No. or Building Permit No.:
Baseline BMPs for Existing and Proposed Site Features
Complete the Table 1 - Site Design Requirement to document existing and proposed site features and the BMPs to be
implemented for them. All BMPs must be implemented where applicable and feasible. Applicability is generally
assumed if a feature exists or is proposed.
BMPs must be implemented for site design features where feasible. Leaving the box for a BMP unchecked means it
will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be
provided in the area below. The table provides specific instructions on when explanations are required.
Table 1 - Site Design Requirement
A.Existing Natural Site Features (see Fact Sheet BL-1)
1.Check the boxes below for each existing feature on
the site.
1.Select the BMPs to be implemented for each identified feature. Explain
why any BMP not selected is infeasible in the area below.
SD-G
Conserve natural
features
SD-H
Provide buffers around waterbodies
Natural waterbodies
Natural storage reservoirs & drainage corridors --
Natural areas, soils, & vegetation (incl. trees) --
B.BMPs for Common Impervious Outdoor Site Features (see Fact Sheet BL-2)
1.Check the boxes below for each
proposed feature.
2. Select the BMPs to be implemented for each proposed feature. If neither BMP SD-B nor
SD-I is selected for a feature, explain why both BMPs are infeasible in the area below.
SD-B
Direct runoff to pervious
areas
SD-I
Construct surfaces from
permeable materials
Minimize size of
impervious areas
Streets and roads Check this box to confirm
that all impervious areas on
the site will be minimized
where feasible.
If this box is not checked,
identify the surfaces that
cannot be minimized in area
below, and explain why it is
Sidewalks & walkways
Parking areas & lots
Driveways
Patios, decks, & courtyards
Hardcourt recreation areas
E-36 Page 2 of 4 Revised 04/23
Other: _______________ infeasible to do so.
C. BMPs for Rooftop Areas: Check this box if rooftop areas are proposed and select at least one BMP
below.
If no BMPs are selected, explain why they are infeasible in the area below.
(see Fact
Sheet BL-3)
SD-B
Direct runoff to pervious areas
SD-C
Install green roofs
SD-E
Install rain barrels
D. BMPs for Landscaped Areas: Check this box if landscaping is proposed and select the BMP below
SD-K Sustainable Landscaping
If SD-K is not selected, explain why it is infeasible in the area below.
(see Fact
Sheet BL-4)
Provide discussion/justification for site design BMPs that will not be implemented (either partially or fully):
Baseline BMPs for Pollutant-generating Sources
All development projects must complete Table 2 - Source Control Requirement to identify applicable requirements for
documenting pollutant-generating sources/ features and source control BMPs.
BMPs must be implemented for source control features where feasible. Leaving the box for a BMP unchecked means it
will not be implemented (either partially or fully) either because it is inapplicable or infeasible. Explanations must be
provided in the area below. The table provides specific instructions on when explanations are required.
Table 2 - Source Control Requirement
A.Management of Storm Water Discharges
1.Identify all proposed outdoor
work areas below
Check here if none are proposed
2. Which BMPs will be used to prevent
materials from contacting rainfall or
runoff?
(See Fact Sheet BL-5)
Select all feasible BMPs for each work area
3.Where will runoff from the
work area be routed?
(See Fact Sheet BL-6)
Select one or more option for each
work area
SC-A
Overhead
covering
SC-B
Separation
flows from
adjacent
areas
SC-C
Wind
protection
SC-D
Sanitary
sewer
SC-E
Containment
system
Other
Trash & Refuse Storage
Materials & Equipment Storage
E-36 Page 3 of 4 Revised 04/23
Loading & Unloading
Fueling
Maintenance & Repair
Vehicle & Equipment Cleaning
Other: _________________
B.Management of Storm Water Discharges (see Fact Sheet BL-7)
Select one option for each feature below:
•Storm drain inlets and catch basins … are not proposed will be labeled with stenciling or signage to
discourage dumping (SC-F)
•Interior work surfaces, floor drains &
sumps …
are not proposed will not discharge directly or indirectly to the MS4
or receiving waters
•Drain lines (e.g. air conditioning, boiler,
etc.) …
are not proposed will not discharge directly or indirectly to the MS4
or receiving waters
•Fire sprinkler test water … are not proposed will not discharge directly or indirectly to the MS4
or receiving waters
Provide discussion/justification for source control BMPs that will not be implemented (either partially or fully):
E-36 Page 4 of 4 Revised 04/23
Form Certification
This E-36 Form is intended to comply with applicable requirements of the city’s BMP Design Manual. I certify that it has
been completed to the best of my ability and accurately reflects the project being proposed and the applicable BMPs
proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I
understand and acknowledge that the review of this form by City staff is confined to a review and does not relieve me as
the person in charge of overseeing the selection and design of storm water BMPs for this project, of my responsibilities for
project design.
Preparer Signature: Date:
Print preparer name:
SUMMARY OF PDP STRUCTURAL BMPS
PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to
hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). PDP’s subject to trash capture requirements must implement trash capture devices (see Chapter 4 of the BMP Design Manual). Storm water pollutant control, flow control for hydromodification management and trash capture can all be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of
the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual).
Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the PDP structural BMP
summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP).
Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs and trash capture
devices, indicate whether pollutant control, trash capture and flow control BMPs are integrated together or separate.
[Continue on next page as necessary.]
[Continued from previous page – This page is reserved for continuation of description of general
strategy for structural BMP implementation at the site.]
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No.
DWG _________ Sheet No. __________
Type of structural BMP:
Retention by harvest and use (HU-1)
Retention by infiltration basin (INF-1)
Retention by bioretention (INF-2)
Retention by permeable pavement (INF-3)
Dry Wells (INF-4)
Partial retention by biofiltration with partial retention (PR-1)
Biofiltration (BF-1)
Proprietary Biofiltration (BF-3)
Flow-thru treatment control included as pre-treatment/forebay for an onsite retention or biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below)
Detention pond or vault for hydromodification management
Trash capture device
Other (describe in discussion section below) Purpose:
Pollutant control only
Hydromodification control only
Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
Trash Capture
Other (describe in discussion section below) Discussion (as needed):
ATTACHMENT 1
BACKUP FOR PDP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet:
Attachment Sequence Contents Checklist
Attachment 1a DMA Exhibit (Required) See DMA Exhibit Checklist on the back of this
Attachment cover sheet. (24”x36” Exhibit typically required)
Included
Attachment 1b Tabular Summary of DMAs Showing DMA ID matching DMA Exhibit, DMA Area, and DMA
Type (Required)* *Provide table in this Attachment OR on DMA
Exhibit in Attachment 1a
Included on DMA Exhibit in Attachment 1a
Included as Attachment 1b, separate from DMA Exhibit
Attachment 1c Form K-7, Harvest and Use Feasibility Screening
Checklist (Required unless the entire project will use infiltration BMPs) Refer to Appendix B of the BMP Design Manual to complete Form K-7.
Included
Not included because
the entire project will use infiltration BMPs
Attachment 1d Infiltration Feasibility Analysis (Required unless the project will use harvest and use BMPs)
Refer to Appendix D of the BMP Design Manual.
Included
Not included because the entire project will use harvest and use BMPs Attachment 1e Pollutant Control BMP Design Worksheets / Calculations (Required) Refer to Appendices B, E, and I of the BMP Design Manual for structural pollutant control and significant site design BMP design guidelines
Included
Attachment 1f Trash Capture BMP Design Calculations Refer to Appendices J of the BMP Design Manual for Trash capture BMP design guidelines
Included
Not included because the entire project is not subject to trash capture requirements
Use this checklist to ensure the required information has been included on the DMA
Exhibit:
The DMA Exhibit must identify:
Underlying hydrologic soil group
Approximate depth to groundwater
Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
Critical coarse sediment yield areas to be protected (if present)
Existing topography and impervious areas
Existing and proposed site drainage network and connections to drainage offsite
Proposed grading
Proposed impervious features
Proposed design features and surface treatments used to minimize imperviousness
Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square footage or acreage), and DMA type (i.e., drains to BMP, self-retaining, or self-mitigating)
Structural BMPs (identify location and type of BMP)
Tabular DMA Summary
ATTACHMENT 1A - DMA EXHIBIT
G
G
G
G
G
G
G
G
G
G
G
GGGG
G
G G GGG
G G G G
G G G
GGG
GGG
GGG
GGGG
GGGG
G G G G
G G G G
GGGG
GGG
GG
G
GGG
GG
G
GGG
GGG
GG
G
GGG
G GGGG
XXXXX
X
XXX
X
X
X X
44 43
///
//
/
//
/
//
/
X
X
X
X
F
F
RWRWRWRWRWRWRWRWRWRWRWRWRW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
WWWWWWWWWWWWWWWW
W
W
W
W
W
W
W
W
W
W
R
W
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
SD SD
SD
SD
S
D
S
D
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
S
D
SD
SD
SD SD SD SD SD SD SD SD
SD
SD
SD
W
W
W
W
W
W
W
W
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
FM
W
W
W
W
W
W
W
W
W
M
SD
SD
SD
SD
SD
SD
SD
SD
SD
SDSDSDSD
SD
SD
SD
SD
SDSDSD
SD
S
D
S
D
SD
SD
SD
SD
SD SD
SD
SD
SD
SD
SD
M
M
W
CL
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD
SD SD SD
M
SD
S
D
PO
N
T
O
D
R
I
V
E
PONTO ROAD
NORTH
C
O
U
N
T
Y
T
R
A
N
S
I
T
D
I
S
T
R
I
C
T
(
N
C
T
D
)
RIGHT-
O
F
-
W
A
Y
MA
P
1
1
2
9
0
PM 415
ROS 29310
ROS 20899
DMA-1
DMA-2
DMA-3
DMA-4
DMA-5-1
DMA-5-2
DMA-5-3
DMA-5-4
DMA-5-5
PROPOSED BMP-3
MODULAR WETLAND SYSTEM
MWS-L-4-4-6-6'-8"-V
PROPOSED BMP-2
MODULAR WETLAND SYSTEM
MWS-L-8-12-7'-4"-V
PROPOSED BMP-1
MODULAR WETLAND SYSTEM
MWS-L-8-12-8'-8"-V
PROPOSED BMP 5-4
TREE WELLS
PROPOSED BMP-4
MODULAR WETLAND SYSTEM
MWS-L-8-12-8'-2"-V
POC-A
BMP- 6
INSTALL STORMTEK ST3
TRASH CAPTURE DEVICE
WITHIN SD CLEANOUT
BMP-7
INSTALL STORMTEK ST3
TRASH CAPTURE DEVICE
WITHIN SD CLEANOUT
PROPOSED BMP 5-1
TREE WELLS
PROPOSED BMP 5-2
TREE WELLS
PROPOSED BMP 5-3
TREE WELLS
PROPOSED BMP-4 A
TREE WELL
PROPOSED BMP-2A
TREE WELL
PROPOSED BMP-3A
TREE WELL
PROPOSED BMP-1A
TREE WELL
HYDROLOGIC SOIL TYPE INFO
SOIL: TYPE B SOILS PER WEB SOIL SURVEY APPLICATION AVAILABLE
THROUGH UNITED STATES DEPARTMENT OF AGRICULTURE
GROUNDWATER INFORMATION
GROUNDWATER ENCOUNTERED AT DEPTH OF 20.5'
CRITICAL COARSE SEDIMENT YIELD
NO CRITICAL COARSE SEDIMENT YIELD AREAS TO BE PROTECTED.
REFER TO PRIORITY DEVELOPMENT PROJECT SWQMP PREPARED
BY PASCO, LARET, SUITER & ASSOCIATES
NATURAL HYDROLOGIC FEATURES
NO NATURAL HYDROLOGIC FEATURES (WATERCOURSES, SEEPS,
SPRINGS, WETLANDS) EXIST ON THE PROJECT SITE
100
LEGEND
100
PROPERTY BOUNDARY
RIGHT-OF-WAY
STREET CENTERLINE
DRAINAGE PATH OF TRAVEL
DMA BOUNDARY
EXISTING CONTOUR
PROPOSED CONTOUR
PROPOSED BUILDING/HARDSCAPE AREA
PROPOSED LANDSCAPE AREA
PROPOSED ROAD/AC PAVEMENT
SELF MITIGATING AREA
PROPOSED POST-CONSTRUCTION BMP
PROPOSED TREE WELL
CERTIFICATIONSIGNATURE
BMP NOTES:
1.THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS AND/OR THESE PLANS.
2.NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER.
3.NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY
ENGINEER.
4.NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR
APPROPRIATE BMP CONSTRUCTION AND INSTALLATION.
5.REFER TO MAINTENANCE AGREEMENT DOCUMENT.
6.SEE PROJECT SWQMP FOR ADDITIONAL INFORMATION.
BMP CONSTRUCTION AND INSPECTION NOTES:
THE EOW WILL VERIFY THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING IN COMPLIANCE WITH THE APPLICABLE
REQUIREMENTS. PRIOR TO OCCUPANCY THE EOW MUST PROVIDE:
1.PHOTOGRAPHS OF THE INSTALLATION OF PERMANENT BMPS PRIOR TO CONSTRUCTION, DURING CONSTRUCTION, AND
AT FINAL INSTALLATION.
2.A WET STAMPED LETTER VERIFYING THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING PER THE
REQUIREMENTS OF THE APPROVED PLANS.
3.PHOTOGRAPHS TO VERIFY THAT PERMANENT WATER QUALITY TREATMENT SIGNAGE HAS BEEN INSTALLED. PRIOR TO
RELEASE OF SECURITIES, THE DEVELOPER IS RESPONSIBLE FOR ENSURING THE PERMANENT BMPS HAVE NOT BEEN
REMOVED OR MODIFIED BY THE NEW HOMEOWNER OR HOA WITHOUT THE APPROVAL OF THE CITY ENGINEER.
PLAN PREPARED BY:
NAME: TYLER G. LAWSON
COMPANY: PASCO LARET SUITER & ASSCOIATES
ADDRESS: 1911 SAN DIEGO AVE. SAN DIEGO, CA 92110
PHONE NO.: (858) 259-8212
J:\ACTIVE JOBS\3754 FENTON-PONTO RD\CIVIL\REPORTS\SWQMP\Attachment 1a - DMA Exhibit
DMA EXHIBIT
FPC RESIDENTIAL
ATTACHMENT 1a
PLSA JOB NUMBER : 4033
DATE : 9/19/23
C80356
GRAPHIC SCALE: 1" = 30'
0 30'60'90'
REVISION DESCRIPTION CITY APPROVAL
INITIALDATE
ENGINEER OF WORK
INITIALDATE
ENGINEERING DEPARTMENT
DRAWING NO.PROJECT NO.
CHKD BY:
DWN BY:
APPROVED:
DATE INITIAL
RVWD BY:
"AS BUILT"
DATE
INSPECTOR DATE
REVIEWED BY:
P.E.EXP.
1
ENGINEERING MANAGER RCE 63912 EXPIRES 9/30/24
JASON S. GELDERT
DATE
OTHER APPROVAL
SHEETSSHEET
GRADING PLANS FOR:
J:\ACTIVE JOBS\3754 FENTON-PONTO RD\CIVIL\DRAWING\GRADING PLANS
22
SDP 2022-0003
GR 2023-0029
543-6A
18
BMP PLAN DETAILS
0.320
0.320 0.255
0.255
REVISION DESCRIPTION CITY APPROVAL
INITIALDATE
ENGINEER OF WORK
INITIALDATE
ENGINEERING DEPARTMENT
DRAWING NO.PROJECT NO.
CHKD BY:
DWN BY:
APPROVED:
DATE INITIAL
RVWD BY:
"AS BUILT"
DATE
INSPECTOR DATE
REVIEWED BY:
P.E.EXP.
1
ENGINEERING MANAGER RCE 63912 EXPIRES 9/30/24
JASON S. GELDERT
DATE
OTHER APPROVAL
SHEETSSHEET
GRADING PLANS FOR:
J:\ACTIVE JOBS\3754 FENTON-PONTO RD\CIVIL\DRAWING\GRADING PLANS
22
SDP 2022-0003
GR 2023-0029
543-6A
19
BMP PLAN DETAILS
0.009 0.327
0.327
ATTACHMENT 1B- DMA SUMMARY TABLE
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e
f
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t
a
b
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a
b
u
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a
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D
M
A
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m
m
a
r
y
9 7,903 5.40
ATTACHMENT 1c - FORM K-7 HARVEST & REUSE
X
X
(9.3 gal/person*day)(0.13368 ft^3/gal) = 1.24 ft^3/person*day * 1.5 days = 1.86 ft^3/36 hrs
86 units with 4 people/unit = 344 people * 1.86 ft^3 = 639.84 ft^3
1.53 ac. irrigated (390 gal/ac)(0.13368 ft^3/gal) = 79.76 ft^3
36-hr demand total = 639.84 + 79.76 = 719.6 ft^3
7,867.5
X X X
X
ATTACHMENT 1d - INFILTRATION FEASIBILITY ANALYSIS
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
485 Corporate Drive, Suite B
Escondido, California 92029
P: (619) 867-0487 | E: info@adv-geosolutions.com
ORANGE AND L.A. COUNTIES INLAND EMPIRE SAN DIEGO AND IMPERIAL COUNTIES
(714) 786-5661 (619) 867-0487 (619) 867-0487
H.G. Fenton Company March 16, 2022
7577 Mission Valley Road P/W 2107-12
San Diego, California 92108 Report No. 2107-12-B-5
Attention: Ryley Webb
Subject: Preliminary Infiltration Feasibility Study, Proposed Multi-Family Residential
Development, 7200-7294 Ponto Drive, Carlsbad, California
References: See Attached
Gentleperson:
In accordance with your request, Advanced Geotechnical Solutions, Inc. (AGS) has prepared this
infiltration feasibility study for the proposed multi-family residential development located on 7200-7294
Ponto Drive in the City of Carlsbad, California. This report is intended to meet the preliminary infiltration
testing requirements of the City of Carlsbad. AGS has evaluated the feasibility for storm water infiltration
in accordance with the City of Carlsbad BMP Design Manual (2021). Supporting data are presented in
Appendix AA.
1.0 SITE DESCRIPTION AND PROPOSED DEVELOPMENT
The approximately 4.64 acre site is located north of Ponto Avenue in Carlsbad, California as shown in
Figure 1, Site Location Map. The site encompasses three parcels which are located northeast of the
intersection of Ponto Drive and Ponto Road: APN 214-160-25-00 (1.52 acres), 214-171-11-00 (2.24 acres),
and 214-160-28 (0.92 acres). The parcel north of Ponto Avenue and east of Ponto Drive is currently
occupied by a self-storage facility, which was constructed between 1967 and 1978. The site to the north has
been periodically used as a storage/junk yard and more recently as a contractor lay-down yard, and no
permanent structures are present on the property. The site just to the east is mostly undeveloped aside from
two vacant structures which were constructed between 1967 and 1978.
The site slopes and drains to the south. Based on our review of historical aerial imagery circa 1947, a north-
south trending drainage was located on the self-storage site and contractor site prior to development. This
was filled in and moved by 1953. The channel continued to the south roughly along the current alignment
of Ponto Drive and was filled in and/or moved by 1964. As shown on the Base Map prepared by Hunsaker
and Associates San Diego, site elevations range between 48 feet above mean sea level (msl) on the
southeastern corner to 38 ft. msl on the southwestern corner. A high-pressure gas line with a 10-foot
easement crosses the site from north to south.
According to the Design Study plan prepared by Hunsaker & Associates San Diego, Inc. (2022), it is our
understanding that the project consists of twenty-three two- and three-story multi-family buildings with
parking in the first level, and associated driveways, parking and open space areas. Additional improvements
include sound walls, retaining walls and utility installations. Cuts and fills up to 5 feet in depth are
anticipated.
March 16, 2022 Page 2
P/W 2107-12 Report No. 2107-12-B-5
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
2.0 FIELD INVESTIGATION
On January 31, 2022, five percolation test borings (labeled P-1 through P-5) were advanced to depths
ranging between 5 and 6 feet below ground surface using a mini excavator equipped with an 8-inch diameter
flight auger. Approximate percolation test locations are shown on Plate 1, Exploration Location Plan. An
engineer from our firm logged the percolation test borings for soil and geologic conditions. Boring logs are
presented in Appendix B.
3.0 GEOLOGY
Based upon our subsurface exploration, the site is generally mantled by artificial fill and/or alluvium
underlain by Old Paralic Deposits, Unit 6.
4.0 TEST PROCEDURE
Borehole percolation tests were performed to evaluate the feasibility of storm water infiltration in general
conformance with Appendix D of the City of Carlsbad BMP Design Manual (2021). After drilling, the test
holes were cleaned of sediment and the bottom was lined with approximately 2 inches of washed gravel.
The test holes were then successively filled with clean, potable water and allowed to pre-soak.
After the pre-soak period, the borehole percolation tests were performed by filling the test holes with clean
potable water. Water was allowed to infiltrate during 30-minute periods and the water drop was measured
to calculate the percolation rate in inches per hour. The test hole was then refilled with water as necessary
and the test procedure was repeated over the course of several hours until a stabilized percolation rate was
recorded The stabilized percolation rate was then converted to an infiltration rate based on the “Porchet
Method” utilizing the following equation:
Where:
Logs of field testing and graphical representations of test data presented as infiltration versus time interval
are included in Appendix AA.
5.0 TEST RESULTS AND PRELIMINARY DESIGN VALUES
In accordance with Appendix D, Section D.2.3 of the BMP Design Manual, a safety factor between 2.0 and
9.0 must be applied to the infiltration rates. Details of the BMP improvements are not currently known;
therefore determination of a safety factor should be deferred until the locations, elevations, and type of
BMP improvements are known. If an underdrain system is utilized, a default safety factor of 2.0 may be
applied per Section D.2.3. For purposes of this feasibility study, we have assumed an underdrain system
will be utilized if infiltration type BMP’s are used, and a safety factor of 2 has been used. The percolation
test observations and results are summarized in Table 1.
March 16, 2022 Page 3
P/W 2107-12 Report No. 2107-12-B-5
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
TABLE 1
SUMMARY OF INFILTRATION TEST RESULTS
Test
No.
Depth of
Test
Hole (ft)
Approximate
Test Elevation
(ft, msl)
Geologic
Unit
Soil Classification
(USCS)
Infiltration
Rate*
(in/hr)
Safety
Factor
Design
Infiltration
Rate (in/hr)
P-1 5.1 35 Qop Clay (CH) 0.0 2 0.0
P-2 5.3 35 Qop Clayey Sand (SC) 0.1 2 0.05
P-3 5.7 41 Qop Silty Sand (SM) 0.88 2 0.44
P-4 5.7 41 Qop Silty Sand (SM) 0.38 2 0.19
P-5 5.0 41 Afu/Qop Silty Sand (SM) 1.1 2 0.55
Note: *Calculated by Porchet Method.
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
485 Corporate Drive, Suite B
Escondido, California 92029
Telephone: (619) 867-0487 Fax: (714) 409-3287
ORANGE AND L.A. COUNTIES INLAND EMPIRE SAN DIEGO AND IMPERIAL COUNTIES
(714) 786-5661 (619) 867-0487 (619) 867-0487
H.G. Fenton Company August 18, 2022
7577 Mission Valley Road P/W 2107-12
San Diego, California 92108 Report No. 2107-12-B-6
Attention: Ryley Webb
Subject: Additional Comments, Feasibility of Onsite Infiltration, Proposed Multi-Family
Residential Development, 7200-7294 Ponto Drive, Carlsbad, California
References: See Appendix
Gentlepersons,
In accordance with your request, Advanced Geotechnical Solutions, Inc. (AGS) has prepared this letter
presenting additional comments related to the feasibility of infiltration at the subject residential
development on Ponto Drive in Carlsbad, California. AGS prepared an infiltration feasibility report (2022b)
and recommended that infiltration type BMP’s not be installed as part of the proposed development.
Subsequent to the preparation of the infiltration report, AGS has reviewed the referenced geotechnical
reports by Geotechnics Incorporated and Group Delta for the westerly and northerly adjacent hotel and spa.
Geotechnics Incorporated conducted a geotechnical investigation for the adjacent hotel and spa in 2009,
which included subsurface exploratory work consisting of six exploratory borings, including two within the
footprint of the parking garage located adjacent to the northerly boundary of the subject site. The boring
logs for Geotechnical Incorporated indicated that a 7-foot thick clay layer was encountered in Boring B-4
at a depth of 6 feet, and a 2.5-foot thick clay layer was encountered in Boring B-6 at a depth of 6 feet. A
similar clay layer was encountered in AGS’s borings and test pits at the subject site, also at similar shallow
depths. This would indicate that the clay layer is fairly continuous and extends offsite. This clay layer is
expected to act as an aquitard and preclude any appreciable infiltrating water from flowing vertically
through the clay layer. Infiltrating water is expected to perch atop this clay layer and flow laterally. Over
time groundwater mounding and lateral flow can occur, increasing the likelihood for water intrusion to
occur in adjacent utility trenches and subgrade soils, which can lead to soil piping, settlement, and
premature failure of pavements and other surface improvements. In addition, the clay layer encountered is
highly expansive and capable of significant volume increases when exposed to water, which can lead to
heaving of overlying soils and improvements.
Accordingly, the DMA’s onsite are considered restricted for infiltration based on the guidance provided in
Appendix D of the City of Carlsbad’s BMP manual. Vertical infiltration of appreciable amounts of water
is not considered technically feasible onsite without increasing the risk of geotechnical hazards to adjacent
properties, City utilities, and proposed project improvements that cannot be reasonably mitigated. It is
recommended that stormwater BMPs constructed onsite utilize an impermeable liner/membrane to mitigate
potential negative impacts to improvements both onsite and offsite.
August 18, 2022 Page 2
P/W 2107-12 Report No. 2107-12-B-6
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
The opportunity to be of service is sincerely appreciated. If you should have any questions, please do not
hesitate to contact the undersigned.
___________________________________
JOHN J. DONOVAN
RCE 65051, RGE 2790, Reg. Exp. 6-30-23
2107-12-B-6 (Additional Comment, Infiltration Feasibility, Aug 18, 2022).docx
Appended Appendix- References
Distribution: (1) Addressee (pdf)
August 18, 2022 Page 2
P/W 2107-12 Report No. 2107-12-B-6
ADVANCED GEOTECHNICAL SOLUTIONS, INC.
APPENDIX
REFERENCES
Advanced Geotechnical Solutions, Inc. (2021). “Due Diligence Geotechnical Study, Proposed Multi-
Family Residential Development, 7200-7590 Ponto Drive, Carlsbad, County of Orange, California,”
dated December 3, 2021, Report No. 2107-12-B-2R.
---. (2022a). “Preliminary Geotechnical Investigation and Infiltration Study, Proposed Multi-Family
Residential Development, 7200-7294 Ponto Drive, Carlsbad, California,” dated March 16, 2022,
Report No. 2107-12-B-4.
---. (2022b). “Preliminary Infiltration Feasibility Study, Proposed Multi-Family Residential Development,
7200-7294 Ponto Drive, Carlsbad, California,” dated March 16, 2022, Report No. 2107-12-B-5.
City of Carlsbad, 2021, Storm Water Standard – BMP Design Manual, February 2016, Revised
September 1, 2021, Edition.
Geotechnics Incorporated. (2009). “Geotechnical Investigation, Hilton Carlsbad Beach Resort and Spa,
Carlsbad, California,” dated April 24, 2009 (Project No. 0703-002-01, Document No. 09-0206).
Group Delta. (2010a). “Response to Review Comments, Hilton Carlsbad Oceanfront Resort & Spa,
Carlsbad, California,” dated May 10, 2010 (Document No. 10-0288, Project No. 0703-002-01.
---. (2010b). “Response to Request for Information, Hilton Carlsbad Oceanfront Resort, Carlsbad,
California,” dated October 6, 2010 (Document No. 10-0526, Project No. SD-126.
---. (2010c). “Grading Plan Review, Hilton Carlsbad Oceanfront Resort & Spa, Carlsbad, California,”
dated November 30, 2010 (Document No. 10-0601, Project No. SD-126.
Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
B-12 Jan. 2023
Table B.2-1: Infiltration Restrictions
Restriction Element
Is Element
Applicable?
(Yes/No)
Mandatory
Considerations
BMP is within 100’ of Contaminated Soils
BMP is within 100’ of Industrial Activities Lacking Source Control
BMP is within 100’ of Well/Groundwater Basin
BMP is within 50’ of Septic Tanks/Leach Fields
BMP is within 10’ of Structures/Tanks/Walls
BMP is within 10’ of Sewer Utilities
BMP is within 10’ of Groundwater Table
BMP is within Hydric Soils
BMP is within Highly Liquefiable Soils and has Connectivity to Structures
BMP is within 1.5 Times the Height of Adjacent Steep Slopes (≥25%)
City Staff has Assigned “Restricted” Infiltration Category
Optional
Considerations
BMP is within Predominantly Type D Soil
BMP is within 10’ of Property Line
BMP is within Fill Depths of ≥5’ (Existing or Proposed)
BMP is within 10’ of Underground Utilities
BMP is within 250’ of Ephemeral Stream
Other (Provide detailed geotechnical support)
Result Unrestricted. None of the restriction elements above are applicable.
Restricted. One or more of the restriction elements above are applicable.
NO
NO
NO
NO
YES
YES
NO
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
X
Appendix D: Geotechnical Engineer Analysis
D-2 Jan. 2023
Considerations include elements that may pose a significant risk to human health and safety and must
always be evaluated. Optional Considerations include elements that are not necessarily associated with
human health and safety, so analysis is not mandated through this guidance document. All elements
presented in this table are subject to the discretion of the Geotechnical Engineer if adequate
supporting information is provided.
Applicants must evaluate infiltration restrictions through use of the best available data. A list of
resources available for evaluation is provided in Section B.2
Determination of Design Infiltration Rates
This section is only applicable if the determination of design infiltration rates is performed
by a licensed engineer practicing in geotechnical engineering. The guidance in this section
identifies methods for identifying observed infiltration rates, corrected infiltration rates, safety factors,
and design infiltration rates for use in structural BMP design. Upon completion of this section, the
Geotechnical Engineer must recommend a design infiltration rate for each DMA and provide
adequate support/discussion in the geotechnical report.
Table D.2-1: Elements for Determination of Design Infiltration Rates
Item Value Unit
Initial Infiltration Rate
Identify per Section D.2.1 in/hr
Corrected Infiltration Rate
Identify per Section D.2.2 in/hr
Safety Factor
Identify per Section D.2.3 unitless
Design Infiltration Rate
Corrected Infiltration Rate ÷ Safety Factor in/hr
0.88
0.88
4
0.22
Appendix D: Geotechnical Engineer Analysis
D-12 Jan. 2023
Table D.2-3: Determination of Safety Factor
Consideration Assigned
Weight (w)
Factor
Value (v)
Product (p)
p = w x v
Suitability
Assessment
(A)
Infiltration Testing Method 0.25
Soil Texture Class 0.25
Soil Variability 0.25
Depth to Groundwater/Obstruction 0.25
Suitability Assessment Safety Factor, SA = Σp
Design
(B)
Pretreatment 0.50
Resiliency 0.25
Compaction 0.25
Design Safety Factor, SB = Σp
Safety Factor, S = SA x SB
(Must be always greater than or equal to 2)
The geotechnical engineer should reference Table D.2-4 below in order to determine appropriate
factor values for use in the table above. The values in the table below are subjective in nature and
the geotechnical engineer may use professional discretion in how the points are assigned.
3
1
2
2
3
1
1
0.75
0.25
0.50
0.50
1.50
0.25
0.25
2
2
4
Appendix D: Geotechnical Engineer Analysis
D-13 Jan. 2023
Table D.2-4: Guidance for Determining Individual Factor Values
Consideration High Concern
(3 points)
Medium Concern
(2 points)
Low Concern
(1 point)
Infiltration
Testing
Method
Any At least 2 tests of any kind
within 50’ of BMP.
At least 4 tests within BMP
footprint, OR Large/Small
Scale Pilot Infiltration Testing
over at least 5% of BMP
footprint.
Soil Texture
Class
Unknown, Silty,
or Clayey Loamy Granular/Slightly Loamy
Soil
Variability
Unknown or
High Moderately Homogeneous Significantly Homogeneous
Depth to
Groundwater/
Obstruction
<5’ below BMP 5-15’ below BMP >15’ below BMP
Pretreatment None/Minimal
Provides good pretreatment
OR does not receive significant
runoff from unpaved areas
Provides excellent pretreatment
OR only receives runoff from
rooftops and road surfaces.
Resiliency None/Minimal
Includes underdrain/backup
drainage that ensures ponding
draws down in <96 hours
Includes underdrain/backup
drainage AND supports easy
restoration of impacted
infiltration rates.
Compaction Moderate
Likelihood Low Likelihood Very Low Likelihood
ATTACHMENT 1e - POLLUTANT CONTROL DESIGN WORKSHEETS
Project
Category # Description i ii iii iv v vi vii viii ix x Units
1 Drainage Basin ID or Name DMA-1 DMA-2 DMA-3 DMA-4 DMA-5-1 DMA-5-2 DMA-5-3 DMA-5-4 unitless
2 85th Percentile 24-hr Storm Depth 0.57 0.57 0.57 0.57 0.57 0.57 0.57 0.57 inches
3 Impervious Surfaces Not Directed to Dispersion Area (C=0.90) 50,184 40,099 1,299 50,058 3,953 5,084 19,768 8,938 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) 15,198 11,394 538 21,720 667 727 891 429 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 No No No No No No 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 65,382 51,493 1,837 71,778 4,620 5,811 20,659 9,367 0 0 sq-ft
23 Initial Runoff Factor for Standard Drainage Areas 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
24 Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless
25 Initial Weighted Runoff Factor 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
26 Initial Design Capture Volume 2,205 1,761 58 2,250 171 221 854 383 0 0 cubic-feet
27 Total Impervious Area Dispersed to Pervious Surface 0 0 0 0 0 0 0 0 0 0 sq-ft
28 Total Pervious Dispersion Area 0 0 0 0 0 0 0 0 0 0 sq-ft
29 Ratio of Dispersed Impervious Area to Pervious Dispersion Area n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a ratio
30 Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 ratio
31 Runoff Factor After Dispersion Techniques 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 n/a n/a unitless
32 Design Capture Volume After Dispersion Techniques 2,205 1,761 58 2,250 171 221 854 383 0 0 cubic-feet
33 Total Tree Well Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet
34 Total Rain Barrel Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet
35 Final Adjusted Runoff Factor 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
36 Final Effective Tributary Area 46,421 37,075 1,231 47,373 3,604 4,649 17,973 8,056 0 0 sq-ft
37 Initial Design Capture Volume Retained by Site Design Elements 0 0 0 0 0 0 0 0 0 0 cubic-feet
38 Final Design Capture Volume Tributary to BMP 2,205 1,761 58 2,250 171 221 854 383 0 0 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 ii iii iv v vi vii viii ix x Units
1 Drainage Basin ID or Name DMA-1 DMA-2 DMA-3 DMA-4 DMA-5-1 DMA-5-2 DMA-5-3 DMA-5-4 - - unitless
2 85th Percentile Rainfall Depth 0.57 0.57 0.57 0.57 0.57 0.57 0.57 0.57 - - inches
3 Predominant NRCS Soil Type Within BMP Location B B B B B B B B B B unitless
4 Is proposed BMP location Restricted or Unrestricted for Infiltration Activities? Restricted Restricted Restricted Restricted Restricted Restricted Restricted Restricted Restricted Restricted unitless
5 Nature of Restriction unitless
6 Do Minimum Retention Requirements Apply to this Project? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes yes/no
7 Are Habitable Structures Greater than 9 Stories Proposed? No No No No No No No No No No yes/no
8 Has Geotechnical Engineer Performed an Infiltration Analysis? Yes Yes Yes Yes No No No No No No yes/no
9 Design Infiltration Rate Recommended by Geotechnical Engineer 0.220 0.220 0.220 0.220 in/hr
10 Design Infiltration Rate Used To Determine Retention Requirements 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 in/hr
11 Percent of Average Annual Runoff that Must be Retained within DMA 4.5% 4.5% 4.5% 4.5% 4.5% 4.5% 4.5% 4.5% 1.5% 1.5% percentage
12 Fraction of DCV Requiring Retention 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 ratio
13 Required Retention Volume 44 35 1 45 3 4 17 8 0 0 cubic-feet
False
False
Automated Worksheet B.2: Retention Requirements (V2.0)
Advanced
Analysis
Basic Analysis
Result
No Warning Messages
Category #Description i ii iii iv v vi vii viii ix x Units
1 Drainage Basin ID or Name DMA-1 DMA-2 DMA-3 DMA-4 DMA-5-1 DMA-5-2 DMA-5-3 DMA-5-4 unitless
2 85th Percentile 24-hr Storm Depth 0.57 0.57 0.57 0.57 0.57 0.57 0.57 0.57 inches
3 Is Hydromodification Control Applicable? No No No No No No No No yes/no
4 Impervious Surfaces Not Directed to Dispersion Area (C=0.90) 50,184 40,099 1,299 50,058 3,953 5,084 19,768 8,938 sq-ft
5 Semi-Pervious Surfaces Not Serving as Dispersion Area (C=0.30)sq-ft
6 Engineered Pervious Surfaces Not Serving as Dispersion Area (C=0.10) 15,198 11,394 538 21,720 667 727 891 429 sq-ft
7 Natural Type A Soil Not Serving as Dispersion Area (C=0.10)sq-ft
8 Natural Type B Soil Not Serving as Dispersion Area (C=0.14)sq-ft
9 Natural Type C Soil Not Serving as Dispersion Area (C=0.23)sq-ft
10 Natural Type D Soil Not Serving as Dispersion Area (C=0.30)sq-ft
11 Does Tributary Incorporate Dispersion and/or Rain Barrels? No No No No No No No No yes/no
12 Does Tributary Incorporate Tree Wells? Yes Yes Yes Yes Yes Yes Yes Yes yes/no
13 Impervious Surfaces Directed to Dispersion Area per SD-B (Ci=0.90) sq-ft
14 Semi-Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft
15 Engineered Pervious Surfaces Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft
16 Natural Type A Soil Serving as Dispersion Area per SD-B (Ci=0.10)sq-ft
17 Natural Type B Soil Serving as Dispersion Area per SD-B (Ci=0.14)sq-ft
18 Natural Type C Soil Serving as Dispersion Area per SD-B (Ci=0.23)sq-ft
19 Natural Type D Soil Serving as Dispersion Area per SD-B (Ci=0.30)sq-ft
20 Number of Rain Barrels Proposed per SD-E #
21 Average Rain Barrel Size gal
22 Total Tributary Area 65,382 51,493 1,837 71,778 4,620 5,811 20,659 9,367 0 0 sq-ft
23 Initial Runoff Factor for Standard Drainage Areas 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
24 Initial Runoff Factor for Dispersed & Dispersion Areas 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 unitless
25 Initial Weighted Runoff Factor 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
26 Initial Design Capture Volume 2,205 1,761 58 2,250 171 221 854 383 0 0 cubic-feet
27 Total Impervious Area Dispersed to Pervious Surface 0 0 0 0 0 0 0 0 0 0 sq-ft
28 Total Pervious Dispersion Area 0 0 0 0 0 0 0 0 0 0 sq-ft
29 Ratio of Dispersed Impervious Area to Pervious Dispersion Area for DCV Reduction n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a ratio
30 Adjustment Factor for Dispersed & Dispersion Areas 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 ratio
31 Runoff Factor After Dispersion Techniques 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 n/a n/a unitless
32 Design Capture Volume After Dispersion Techniques 2,205 1,761 58 2,250 171 221 854 383 0 0 cubic-feet
33 Total Rain Barrel Volume Reduction 0 0 0 0 0 0 0 0 0 0 cubic-feet
34 Final Adjusted Runoff Factor 0.71 0.72 0.67 0.66 0.78 0.80 0.87 0.86 0.00 0.00 unitless
35 Final Effective Tributary Area 46,421 37,075 1,231 47,373 3,604 4,649 17,973 8,056 0 0 sq-ft
36 Initial Design Capture Volume Retained by Dispersion Area and Rain Barrel(s) 0 0 0 0 0 0 0 0 0 0 cubic-feet
37 Remaining Design Capture Volume Tributary to Tree Well(s) 2,205 1,761 58 2,250 171 221 854 383 0 0 cubic-feet
False
False
SSD-BMP Automated Worksheet I-1: Step 1. Calculation of Design Capture Volume (V1.0)
Standard
Drainage Basin
Inputs
Results
No Warning Messages
Dispersion Area
Adjustment &
Rain Barrel
Adjustment
SSD-BMPs
Proposed
Dispersion Area
& Rain Barrel
Inputs
(Optional)
Initial Runoff
Factor
Calculation
False
Category #Description i ii iii iv v vi vii viii ix x Units
1 Drainage Basin ID or Name DMA-1 DMA-2 DMA-3 DMA-4 DMA-5-1 DMA-5-2 DMA-5-3 DMA-5-4 - - unitless
2 Design Capture Volume Tributary to BMP 2,205 1,761 58 2,250 171 221 854 383 - - cubic-feet
3 Is Hydromodification Control Applicable? No No No No No No No No - - yes/no
4 Predominant NRCS Soil Type Within Tree Well(s) Location unitless
5 Select a Tree Species for the Tree Well(s) Consistent with SD-A Tree Palette Table
Note: Numbers shown in list are Tree Species Mature Canopy Diameters
15' - Willow
Pittosporum
10' - California
Mountain Lilac
10' - California
Mountain Lilac
15' - Willow
Pittosporum
10' - California
Mountain Lilac
15' - Willow
Pittosporum
25' - Western
Redbud
25' - Western
Redbud unitless
6 Tree Well(s) Soil Depth (Installation Depth)
Must be 30, 36, 42, or 48 Inches; Select from Standard Depths**48 48 48 48 48 48 48 48 inches
7 Number of Identical* Tree Wells Proposed for this DMA 1 1 1 1 7 4 3 2 trees
8 Proposed Width of Tree Well(s) Soil Installation for One (1) Tree 6.0 5.0 4.5 5.0 4.5 9.0 9.5 14.0 feet
9 Proposed Length of Tree Well(s) Soil Installation for One (1) Tree 15.0 8.0 9.0 18.0 10.0 10.0 26.0 18.5 feet
10 Botanical Name of Tree Species Pittosporum
Phillyraeoides
Ceanothus 'Ray
Hartman'
Ceanothus 'Ray
Hartman'
Pittosporum
Phillyraeoides
Ceanothus 'Ray
Hartman'
Pittosporum
Phillyraeoides Cercis Occidentalis Cercis Occidentalis - - unitless
11 Tree Species Mature Height per SD-A 25 30 30 25 30 25 25 25 - - feet
12 Tree Species Mature Canopy Diameter per SD-A 15 10 10 15 10 15 25 25 - - feet
13 Minimum Soil Volume Required In Tree Well
(2 Cubic Feet Per Square Foot of Mature Tree Canopy Projection Area)353 157 157 353 157 353 982 982 - - cubic-feet
14 Credit Volume Per Tree 100 40 40 100 40 100 290 290 - - cubic-feet
15 DCV Multiplier To Meet Flow Control Requirements n/a n/a n/a n/a n/a n/a n/a n/a - - unitless
16 Required Retention Volume (RRV) To Meet Flow Control Requirements n/a n/a n/a n/a n/a n/a n/a n/a - - cubic-feet
17 Number of Trees Required 23 45 2 23 5 3 3 2 - - trees
18 Total Area of Tree Well Soil Required for Each Tree 88 39 39 88 39 88 245 245 - - sq-ft
19 Approximate Required Width of Tree Well Soil Area for Each Tree 10 7 7 10 7 10 16 16 - - feet
20 Approximate Required Length of Tree Well Soil Area for Each Tree 10 7 7 10 7 10 16 16 - - feet
21 Number of Trees Proposed for this DMA 1 1 1 1 7 4 3 2 - - trees
22 Total Area of Tree Well Soil Proposed for Each Tree 90 40 41 90 45 90 247 259 - - sq-ft
23 Minimum Spacing Between Multiple Trees To Meet Soil Area Requirements
(when applicable)***15.0 10.0 10.0 18.0 10.0 15.0 26.0 25.0 - - feet
24 Are Tree Well Soil Installation Requirements Met? Yes Yes Yes Yes Yes Yes Yes Yes - - yes/no
25 Is Remaining DCV Requirement Fully Satisfied by Tree Well(s)?No No No No Yes Yes Yes Yes - - yes/no
26 Is Hydromodification Control Requirement Satisfied by Tree Well(s)? n/a n/a n/a n/a n/a n/a n/a n/a - - yes/no
Notes:
*If using more than one mature canopy diameter within the same DMA, only the smallest mature canopy diameter should be entered. Alternatively, if more than one mature canopy diameter is proposed and/or the dimensions of multiple tree well installations will vary, separate DMAs may be delineated.
**If the actual proposed installation depth is not available in the table of standard depths, select the next lower depth.
***Tree Canopy or Agency Requirements May Also Influence the Minimum Spacing of Trees.
Standard Tree
Well Inputs
Attention!
Tree Data
Tree Well Sizing
Calculations
Results
-[Line 21] The number of trees proposed do not provide enough credit volume to meet the requirement (i.e., to satisfy the DCV or RRV as applicable). Increase the number of trees or select a tree that provides a larger credit volume.
False
False
False
SSD-BMP Automated Worksheet I-3: Step 3. Tree Well Sizing (V1.0)
False
False
NOTE: THE TREE WELLS ARE NOT INTENDED TO SATISFY THE ENTIRE DCV. THETREE WELLS ARE INTENDED TO SUPPLEMENT THE PROPOSED MODULARWETLAND SYSTEMS WITH REGARDS TO VOLUME RETENTION. AS SHOWN ONLINE 14 OF THIS SHEET, THE CREDIT VOLUME PER TREE EXCEEDS THEREQUIRED RETENTION VOLUME SHOWN ON LINE 13 OF THE SUBSEQUENT SHEET(WORKSHEET B.2) THEREBY MEETING THE VOLUME RETENTION REQUIREMENTSFOR DMAS 1 THROUGH 4.
3754 FPC Residential
DMA-1 (MWS-1)
4 DCV requiring treatment DCV 2205.0
cubic-
feet
6 Design rainfall intensity i=0.20 in/hr
7 Area tributary to BMP (s)A= 1.50 acres
8 Area-weighted runoff factor (estimate using Appendix B.2) C= 0.71 unitless
9 Calculate Flow Rate = AF x (C x i x A)Q=0.213 cfs
Required Treatment Flow Rate 1.5Q=0.320 cfs
DMA-2 (MWS-2)
4 DCV requiring treatment DCV 1761.0
cubic-
feet
6 Design rainfall intensity i=0.20 in/hr
7 Area tributary to BMP (s)A=1.18 acres
8 Area-weighted runoff factor (estimate using Appendix B.2) C= 0.72 unitless
9 Calculate Flow Rate = AF x (C x i x A)Q=0.170 cfs
Required Treatment Flow Rate 1.5Q=0.255 cfs
DMA-3 (MWS-3)
4 DCV requiring treatment DCV 58
cubic-
feet
6 Design rainfall intensity i=0.20 in/hr
7 Area tributary to BMP (s)A=0.04 acres
8 Area-weighted runoff factor (estimate using Appendix B.2) C= 0.67 unitless
9 Calculate Flow Rate = AF x (C x i x A)Q=0.006 cfs
Required Treatment Flow Rate 1.5Q=0.009 cfs
DMA-4 (MWS-4)
4 DCV requiring treatment DCV 2250.0
cubic-
feet
6 Design rainfall intensity i=0.20 in/hr
7 Area tributary to BMP (s)A=1.65 acres
8 Area-weighted runoff factor (estimate using Appendix B.2) C= 0.66 unitless
9 Calculate Flow Rate = AF x (C x i x A)Q=0.218 cfs
Required Treatment Flow Rate 1.5Q=0.327 cfs
MWS Design Flows Worksheet B.6-1
MWS Design Flows Worksheet B.6-1
1/30/2024
MWS Design Flows Worksheet B.6-1
MWS Design Flows Worksheet B.6-1
STANDARD DETAILSTORMWATER BIOFILTRATION SYSTEMMWS-L-8-12-8'-8"-V
FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP
SITE SPECIFIC DATA
PLAN VIEW
ELEVATION VIEW
RIGHT END VIEW
LEFT END VIEW
GENERAL NOTES
INSTALLATION NOTES
DMA-1/BMP-1
34.49
12"
18"
HDPE
HDPE
37.00IE IN
0.320
0.320
STANDARD DETAILSTORMWATER BIOFILTRATION SYSTEMMWS-L-8-12-7'-4"-V
FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP
SITE SPECIFIC DATA
PLAN VIEW
ELEVATION VIEW RIGHT END VIEW
LEFT END VIEW
GENERAL NOTES
INSTALLATION NOTES
INTERNAL BYPASS DISCLOSURE:
DMA-2/BMP-2
HDPE
HDPE
12"
24"32.12
39.79
32.12 33.00IE IN
39.79 39.79 39.79
0.255
0.255
CU
R
B
O
P
E
N
I
N
G
CURB OPENING
STANDARD DETAILSTORMWATER BIOFILTRATION SYSTEMMWS-L-4-6-6'-8"-V
FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP
SITE SPECIFIC DATA
PLAN VIEW
ELEVATION VIEW RIGHT END VIEW
LEFT END VIEW
GENERAL NOTES
INSTALLATION NOTES
INTERNAL BYPASS DISCLOSURE:
DMA-3/BMP-3
41.04
34.52
41.04 41.04 41.04
34.52 HDPE 12"
0.009
STANDARD DETAILSTORMWATER BIOFILTRATION SYSTEMMWS-L-8-12-8'-2"-V
FOR PATENT INFORMATION, GO TO
www.ContechES.com/IP
SITE SPECIFIC DATA
PLAN VIEW
ELEVATION VIEW
RIGHT END VIEW
LEFT END VIEW
GENERAL NOTES
INSTALLATION NOTES
INTERNAL BYPASS DISCLOSURE:
DMA-4/BMP-4
HDPE 12"
HDPE33.20 24"
33.20
39.80IE IN
0.327
0.327
Modular Wetlands® Characteristics and Capacity Table
California Full Capture Certified Capacities
Table 1
MWS Model
MTFR
(Trash/Sediment)
Trash Storage
Capacity
Sediment Storage
Capacity
(cfs)(ft3)(ft3)
MWS-L-4-4 0.052 10.7 2.7
MWS-L-4-6 0.073 15.0 3.7
MWS-L-4-6.33 0.073 16.7 4.2
MWS-L-4-6.5 0.073 17.6 4.4
MWS-L-4-8 0.115 19.8 4.9
MWS-L-4-13 0.144 32.0 8.0
MWS-L-4-15 0.175 32.0 8.0
MWS-L-4-17 0.206 32.0 8.0
MWS-L-4-19 0.237 32.0 8.0
MWS-L-4-21 0.268 32.0 8.0
MWS-L-6-8 0.147 30.5 7.6
MWS-L-8-8 0.23 36.7 9.2
MWS-L-8-12 0.346 56.3 14.1
MWS-L-8-16 0.462 85.7 21.4
MWS-L-8-20 0.577 94.0 23.5
MWS-L-8-24 0.693 123.4 30.8
MWS-L-10-20 0.693 90.0 22.5
ATTACHMENT 1f - TRASH CAPTURE BMP DESIGN CALCULATIONS
3754 FPC Residential
Trash Capture Design Flow Rate Calculation
Q = Design flow rate (cfs)
C = Runoff factor, area-weighted estimate using Table B.1-1
i = Rainfall intensity (in/hr) for the 1-yr 1hr storm
DMA-2 & DMA-3
1 Design rainfall intensity i=0.471 in/hr
2 Area tributary to BMP A=1.22 acres
3 Area-weighted runoff factor C=0.72 unitless
4 Calculate Flow Rate = C x i x A Q=0.414 cfs
DMA-1 & DMA-4
1 Design rainfall intensity i=0.471 in/hr
2 Area tributary to BMP A=3.15 acres
3 Area-weighted runoff factor C=0.68 unitless
4 Calculate Flow Rate = C x i x A Q=1.009 cfs
1/30/2024
A = Tributary area (ac) which includes the total area draining to the trash capture BMP, including any
offsite or onsite areas that comingle with project runoff and drain to the trash capture BMP.
Trash Capture Design Flows
Trash Capture Design Flows
1. Cover Letter
a. Product Name and General Description of Device
The Stormtek ST3 & ST3G is a Connector Pipe Screen filter used specifically for catch basin or
curb inletsumps and installed in front of the outflow pipe at the bottom of the sump.The Stormtek
device provides physical screening of pollutants such as solids, trash and debris. It is best used
in central drains from paved surface areas in both arterial and non arterial along with
commercial and residential areas.
b. Applicant's Contact Information and Location
Chief Executive Officer: Keith Morgan
Storm Water Inspection & Maintenance Services, Inc
Chief Financial Officer and Office Manager
keith@swimsclean.com
(925) 783-9092
Vice President: Todd Hudson
Storm Water Inspection & Maintenance Services, Inc
Vice President of Operations
todd@swimsclean.com
(925) 570-4575
Authorized Representative: Ric Campos
Storm Water Inspection & Maintenance Services, Inc
President and Owner
ric@swimsclean.com
(510) 773-5461
Mailing Address: Storm Water Inspection & Maintenance Services, Inc
c/o Ric Campos
PO Box 1627
Discovery Bay, CA 94505
c. Manufacturer's Website for Device
https://swimsclean.com/stormtek/
i
d. Manufacturing Location for Device
Manufacturer Name: Storm Water Inspection & Maintenance Services, Inc
Manufacturer Address: 698 Enterprise Court
Livermore, CA 94550
Manufacturer Phone: (925) 516-8966
Manufacturer Representative: Ethan Purkey
(925) 698-5417
e. Summary of Field/Lab Testing Results
All solids, trash and debris for any storm event is captured with the Stormtek device with it's full trash
capture 5mm mesh screen. No lab testing has been recorded for the Stormtek ST3 or ST3G device.
f. Summary of Device Limitations, and Operational, Sizing and Maintenance
Considerations
Each Stormtek unit is specifically designed for a specific catch basin or outflow pipe. We wake all
elements into consideration for the design and build, which is for the benefit of both catching
contaminants and utilizing the space for best possible flow rates. Our durable frame is mounted to the
outflow pipe wall and is equipped with pins that will hold the device in place and can be easily removed
for maintenance and vector control. The STORMTEK device is made with a high grade steel (S-304) and
a 5mm mesh screen. Our welded mesh screen and framing throughout makes our device able to
withstand the toughest of conditions and with a track record of doing just that. Please refer to our website
www.swimsclean.com/stormtek to see a list of cities that have trusted the STORMTEK device.
Maintenance on the Stormtek unit is imperative for the function and durability of the device. The
schedule of maintenance should be Two (2) Times Per Year (once in the dry season and once in the wet
season) unless additional services are required in high traffic areas. The two cleanings are required to
ensure correct trash capture and bypass does not occur.
g. Description, or List of Locations, where Device has been installed
The Stormtek device has been installed throughout California and nationally to meet various trash
capture projects and applications. See list below with a few examples of installation areas:
Example of Installations
Project Location Contact
City of San Jose
City of Milpitas
Apple Spaceship Campus
Various streets in city
Great Mall Pkwy, Milpitas
Blvd
10955 N Tantau Ave,
Cupertino, CA 95014
Theresa Porter
Julie Waldron
Preston Pipelines
ii
h. Certification
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my injury of the person(s) that manage the system or
those persons directly responsible for gathering the information, to the best of my knowledge and belief,
the information submitted is, true, accurate, and complete. I am aware that there are significant penalties
for submitting false information, including the possibility of fine and imprisonment for knowing violations.
7/14/2021
Ric Campos Date
Storm Water Inspection & Maintenance, Inc
President/Owner
ric@swimsclean.com
(510) 773-5461
iii
Table of Contents
1. Cover Letter
a. Product Name and General Description of Device...........................................i
b. Applicant's Contact Information and Location...................................................i
c. Manufacturer's Website for Device....................................................................i
d. Manufacturing Location for Device...................................................................ii
e. Summary of Field/Lab Testing Results.............................................................ii
f. Summary of Device Limitations, and Operational, Sizing, and Maintenance
Considerations...................................................................................................ii
g. Description, or List of Locations, where Device has been installed..................ii
h. Certification......................................................................................................iii
2. Table of Contents............................................................................................1-2
3. Physical Description..........................................................................................3
a. Trash Capture: Description of Device..............................................................3
b. Peak Flows/Trash Volumes.............................................................................4
c. Hydraulic Capacity...........................................................................................4
1) Hydraulic Capacity Table.............................................................................4
2) Alternative Configuration Hydraulic Capacity Table.....................................4
3) Hydraulic Capacity Calculations or Field Test Results.................................4
d. Comparison Table............................................................................................4
e. Design Drawings..............................................................................................5
f. Alternative Configurations.................................................................................5
g. Internal Bypass................................................................................................5
h. Previously Trapped Trash................................................................................5
i. Calibration Feature............................................................................................5
j. Photos...............................................................................................................6
k. Material Type...................................................................................................7
l. Design Life........................................................................................................7
1
4. Installation Guidance........................................................................................8
a. Installation Procedures....................................................................................8
b. Device Installation Limitations/Non-standard Installation Procedures.............8
c. Diagnosing and Correcting Installation Errors.................................................8
5. Operation and Maintenance Information.........................................................9
a. Device Inspection Procedures and Frequency Considerations........................9
b. Device Maintenance Frequency Related to Hydraulic Capacity.......................9
c. Maintenance Procedures..................................................................................9
d. Maintenance Equipment and Materials..........................................................10
e. Effects of Deferred Maintenance....................................................................10
f. Repair Procedures...........................................................................................10
6. Vector Control Accessibility...........................................................................11
a. Date of Submittal to Mosquito Vector Control Association.............................11
b. Description of Access for Vector Control Personnel.......................................11
c. Letter of Verification from Mosquito Vector Control Association.....................11
7. Reliability Information.....................................................................................12
a. Estimated Design Life.....................................................................................12
b. Warranty Information......................................................................................12
c. Customer Support Information........................................................................12
8. Field/Lab Testing Information & Analysis.....................................................13
a. Available Field/Lab Testing Information - Devices with 5mm Screen.............13
b. Available Field/Lab Testing Information - Devices without 5mm Screen........13
APPENDIX A.........................................................................................................14
Stormtek Design Drawing...................................................................................15
APPENDIX B.........................................................................................................16
MVCAC Approval Document..............................................................................17
2
Section 1. Physical Description
DESCRIPTION OF DESIGN ELEMENTS
• The mounting frame can be made of coated or stainless steel. Frame
members are made from 2” flat bars with a minimum thickness of 3/16
inch.
• The insert screen is made of heavy-gage sheet metal with 5 millimeter
(mm) openings. Total openings constitute 50% of the screen surface. Top
4 inches of the screen is grated with bars spaced at 2 inches on center.
• Insert top cover is made of heavy-gage sheet metal screen with 5 mm
openings and 1” support frames.
• Structural support members for the screen and top cover are made of
coated or stainless steel. Members are made from 1” flat bars with a
minimum thickness of 1/8 inch.
• Mounting frame members are welded
• Structural support frame members are welded
• Insert screens are welded onto structural support frames.
• Mounting frames are bolted onto the catch basin wall at the outlet
opening. Mounting frames are to be anchored at all four corners with HILTI
expansion anchors or equal.
• Inserts are installed vertically onto the mounting frame directly in front of
the outlet opening.
•The insert is completely removable by lifting it off the mounting frame
a. Trash Capture: Description of Device
Internal Bypass: The bypass can range anywhere between 6-8 inches of an
opening near the top of the device for heavy flow rates. Once the flow
reaches the bypass it can flow freely into bypass.
3. Physical Desription
3
b. Peak Flows / Trash Volumes
The tables in Section 3 Hydraulic Capacities list Peak Flow and Trash
(Storage) Volume capacities for 4 common sizes of the Stormtek ST3 &
ST3G devices.
c. Hydraulic Capacity
1) Hydraulic Capacity Table
2) Alternative Configuration Hydraulic Capacity Table
Stormtek does not have alternative configurations
3) Hydraulic Capacity Calculations or Field Test Results
See Table Above
d. Comparison Table
The tables in table above lists storage and hydraulic capacities for 4 common sizes of
the Stormtek device
Stormtek ST3 & ST3G Connector Pipe Screen
Hydraulic Capacity
Filtered Flow
(CFS)Stormtek
device size
24 x 24 x 12r
24 x 36 12r
Peak/
Bypass Flow
(CFS)
Storage
Capacity
(CF)
24 x 18 x 12r
24 x 30 x 12r
5.86 3.81
Empty 25% Full 50% Full 75% Full
2.07 .73 10.29 .95
9.02 5.86 3.19 1.13 10.59 1.27
12.61 8.19 4.46 1.58 10.59 1.58
16.57 10.76 5.86 2.07 10.59 1.90
4
e. Design Drawings
Design drawings for Stormtek are included in Appendix A
f. Alernative Configurations
Stormtek does not have alternative configurations
g. Internal Bypass
The bypass on the Stormtek device is designed for the occasion when full
capacity of the sump surrounding the device has occurred. The bypass is
located on the upper area of the device right below the deflector plate.
This bypass is equal to the flow rate based on the size of the outflow pipe.
Note: Bypass should not occur when the device is properly maintained
and on a regular maintenance schedule.
h. Previously Trapped Trash
The Stormtek device is designed with a semi circle shape to provide more
of a storage area for trapped trash and helps roll trash to sides. This helps
give more room for storing previously trapped trash. This trash only
discharges downstream when there is no regular maintenance and the
storage height has reached the bypass area.
i. Calibration Feature
Stormtek does not have a calibration feature
5
j. Photos
Figure 1. Installed Stormtek device Figure 2. Installed Stormtek device
Figure 3. Installed Stormtek device Figure 4. Installed Stormtek device
Figure 6. Installed Stormtek device
in shallow sump
6
k. Material Type
The Stormtek device is made of all stainless steel 304 metal. The
mounting frame are made of 2" flat bars with a minimum thckness of 3/16
inch. The insert screen is made of heavy gage sheet metal with less than
5mm openings. The top openings of 4" of the screen is grated with bars
spaced 2" on center. The top cover is made of the same material as the
insert screen. The structural support members for the screen is made of
stainless steel and are made from 1" flat bars with a minimum thickness of
1/8".
l. Design Life
The design life for the Stormtek device is 15 years. This is dependent on
being correctly installed along with the recommended maintenance of at
least (2x) per year or more depending on surrounding conditions.
7
6
4. Installation Guidance
a. Installation Procedures
b. Device Installation Limitations/ Non-standard Installation Procedures
Although the STORMTEK device is manufactured to the specification of the catch basin/vault,
occasionally the CB sump is too shallow to be practical. In this case we recommend relocating the
device to an alternate CB. In the event of a non-standard installation procedure the installer can
contact STORMTEK customer service at (925) 516-8966. Ask for Ethan or Todd
c. Diagnosing and Correcting Installation Errors
STORMTEK has been designed for simple installation and maintenance. After installation, visually
inspect frame for contact with CB/vault wall. Install and remove STORMTEK screen from locator pins
on frame for easy removal for maintenance. If there a problem exists, please review all steps in the
above installation procedure. In the event of a problematic installation procedure the installer can
contact STORMTEK customer service at (925) 516-8966. Ask for Ethan or Todd
8
a. Installation Procedures
STORMTEK is custom manufactured to fit each specific installation. Proper
measurement is required prior to ordering the device. It is recommended that the
catch basins are cleaned and inspected for any damage or irregularities prior to
installing the STORMTEK device. If the installation surfaces on the catch basin/vault
walls are irregular or damaged, some modifications may be needed to create a smooth
mounting surface.
1. Set up all safety requirements prior to starting installation.
2. Remove the manhole cover or grate.
3. Clean CB/vault surfaces.
4. Center STORMTEK frame over effluent pipe.
5. Attach to CB/vault wall with expansion anchors.
6. The STORMTEK screen is placed on the frame locator pins and slide down to
secure in place.
7. Reinstall manhole cover or grate.
b. Device Installation Limitations / Non-standard Installtion Procedures
Although the Stormtek device is manufactured to the specification of the catch
basin/vault, occasionally the CB sump is too shallow to be practical. In this case we
recommend relocation the
device to an alternate CB. In the event of non-standard installation procedure the
installer can contact Stormtek customer service at (925) 516-8966. Ask for Ethan or
Todd.
c. Diagnosing and Correcting Installation Errors
Stormtek has been designed for simple installation and maintenance. After installation,
visually inspect frame for contact with CB/vault wall. Install and remove Stormtek
screen from locater pins on frame for easy removal for maintenance. If there a problem
exists, please review all steps in the above installation procedure. In the event of a
problematic installation procedure the installer can contact Stormtek customer service
at (925) 516-8966. Ask for Ethan or Todd.
4. Installation Guidance
7
5. Operation and Maintenance Information
a. Inspection Procedures and Frequency Considerations
Inspection and Maintenance intervals will depend on many factors such as location, size/quantity, storm
water runoff volume, surrounding vegetation and debris potential. The following is the minimum
inspection recommendation, but inspection and maintenance may need interval increases, as necessary.
STORMTEK recommends two inspection per year minimum. The first inspection should take place at the
start of the rainy season and the second inspection taking place near the end of the rainy season. **
Inspections in the first year of installation should be more frequent, 3-4 times per year, to establish a
base line for debris loading. ** If the region of installation has no definitive rainy season, inspections
should be spaced evenly throughout the year.
STORMTEK Connector Pipe Screens can be inspected without entry into the catch basin.
Follow all safety precautions, traffic control and PPE requirement for the specific work area.
SAFETY FIRST
1. Remove the manhole cover or grate.
2. Inspect the interior catch basin opening, walls and floor.
3. Inspect the STORMTEK connector pipe screen for damage or looseness.
4. Inspect vector control deflector plate for proper operation (if applicable)
5. Measure debris load with sludge judge, tape measure or equal.
6. Note findings and take photos as necessary.
7. Note if any vector problems.
8. Replace the manhole cover or grate.
b. Device Maintenance Frequency Related to Hydraulic Capacity
Periodic maintenance is required to ensure proper function of the STORMTEK Connector Pipe Screen and
to ensure continued protection of the receiving water bodies. A maintenance program should be based
on the data from the previous inspection history as well the size and location of the STORMTEK device. A
customized maintenance program provides the most benefit to operation while minimizing maintenance
costs. Maintenance should be performed when the STORMTEK device reaches 75% height /volume
capacity.
c. Maintenance Procedures
Follow all safety precautions, traffic control and PPE requirement for the specific work area.
SAFETY FIRST. STORMTEK recommends the following maintenance procedures:
5. Operation and Maintenance Information
a. Device Inspection Procedures and Frequency Considerations
b. Device Maintenance Frequency Related to Hydraulic Capacity
c. Maintenance Procedures
9
8
1. The manhole cover or grate shall be removed and set to one side.
2. The catch basin shall be visually inspected for defects and possible illegal dumping. If illegal
dumping has occurred, the proper authorities and property owner representative shall be
notified as soon as practicable.
3. Using an industrial vacuum, the collected debris/materials shall be removed from the catch
basin/vault.
4. When all collected debris/materials have been vacuumed, the STORMTEK device can be
easily removed by lifting the screen off of the locator pins. The STORMTEK screen can now
be inspected and cleaned.
5. Reinstall the screen on to the locator pins and secure in place.
6. The manhole cover or grate shall be reinstalled.
7. All removed debris shall be disposed of in accordance with local, state, and federal agency
requirements.
d. Maintenance Equipment and Materials
The following equipment should be used to conduct maintenance on the STORMTEK connector pipe
screen.
• Personal Protective Equipment (PPE), Safety equipment and traffic control as needed.
• Lighting as needed
• Industrial vacuum
• Pressure washer (recmended)
• Tools for safe removal/reinstallation of manhole or grate.
e. Effects of Deferred Maintenance
Deferred maintenance may allow the STORMTEK device to achieve capacity and go into bypass.
Once the system is in bypass, no additional trash or debris will be collected. If bypass occurs, the
debris in the bypass flows will pass through the system and discharge in receiving waters.
f. Repair Procedures
If inspection of the STORMTEK device reveals damage and is in need of repair, the damage should be
documented, photographed, and then submitted to STORMTEK (SWIMS) for assessment. STORMTEK
personnel will evaluate the damage and recommend or initiate any warranty repair. Responsibility for
the repair will depend on the cause of damage.
d. Maintenance Equipment and Materials
e. Effects of Deferred Maintenance
f. Repair Procedures
10
Section 4. Mosquito and Vector Control
The StormTek ST3G device has a hinged deflector plate that can lift-up for mosquito or vector
inspection, access, or treatment. This deflector plate can be lifted through the storm grate with
a simple hook tool or equal. The deflector plate is light weight and easy to lift and return into
position. The lid and hinges are made from stainless steel and therefore will not rust.
Application for the Mosquito and Vector Control Association of California approval of the
Stormtek device was submitted on February 3rd of 2021.
6. Vector Control Accesibility
a. Date of Submittal to Mosquito Vector Control Association
The Application for the Mosquito and Vector Control Association of California approval of the
Stormtek Device was submitted on August 4th of 2021.
b. Description of Access for Vector Control Personnel
a. Date of Submittal to Mosquito Vector Control Assocation
c. Letter of Verification from Mosquito Vector Control Association
Refer to Appendix B for letter of verification from MVCAC
11
10
7. Reliability Information
a. Estimated Design Life
The estimated design life for the STORMTEK Connector Pipe Screen is 15 years. Design life estimate is
dependent on the proper design, installation and maintenance of the system and assume no
extraordinary circumstances.
b. Warranty Information
STORMTEK warranties the ST3 and ST3G models to be free from manufacturing defects for a period of
one (5) year from the date of purchase. Abusive treatment, lack of routine maintenance, neglect or
improper use of the will not be covered by this warranty.
c. Customer Support Information
STORMTEK (and SWIMS) offers full customer service and support for all STORMTEK products.
Customer Support contact information:
STORMTEK and Storm Water Inspection and Maintenance Services, Inc.
PO Box 1627
Discovery Bay, CA 94505
(925) 516-8966
Web site: www.swimsclean.com
E-mail: info@swimsclean.com
7. Reliability Information
a. Estimated Design Life
b. Warranty Information
c. Customer Support Information
12
11
8. Field/Lab Testing Information and Analysis
a. Available Field/Lab Testing Information – Devices with 5mm Screen
STORMTEK includes a screen with 4.9mm apertures through which all treatment flow must pass to
travel downstream; therefore, testing is not required to demonstrate trash capture performance
because particles 5mm in diameter and larger cannot physically pass through the screen.
b. Available Field/Lab Testing Information – Devices without 5mm Screen
STORMTEK without the trash capture (4.9mm aperture) screen do not have testing or field data
available and will not be used for trash capture applications.
8. Field/Lab Testing Information and Analysis
a. Available Field/Lab Testing Information - Devices with 5mm Screen
b. Available Field/Lab Testing Information - Devices without 5mm Screen
13
APPENDIX A APPENDIX A
14
Catch Basin Sump
StormTek™ ST3/ST3G
Deflector Plate only
with ST3G Model
Stainless Steel Frame
(2" flat bars, 3/16" thick)
mounted to wall
Device fastens on pins
Outflow Pipe
Heavy-Gage Sheet Metal Screen
S-304 Stainless Steel
5mm openings
Structural Support Bars
(Bypass)
Stainless Steel
1" flat bars
1/8" thickness
- Bypass has
equivalent or greater
flow rate as outflow
pipe
10/25/2018
P.O. Box 1627
Discovery Bay, CA 94505
StormTek
a) StormTek™ ST3/ST3G
b) StormTek™ is installed in front of the
outflow pipe is supported by the frame
mounted on the existing catch basin wall
c) This device is designed to capture
trash, sediment and debris from entering
the storm water system.
StormTek™ ST3/ST3G Installation: Connector Pipe Screen Filter
P.O. Box 1627
Discovery Bay, CA 94505
NorCal: 925.516.8966
SoCal: 949.542.7234
www.swimsclean.com
General Notes:
Revision/Issue
Company Name and Address:
Product Name and Address:
Scale:
Scale
StormTek™ Pipe Screen
Model ST3/ST3G
Project:
No.
1
- Device is retro-fitted
to catch basin
specifications
- Deflector plate is the
only difference
between ST3 & ST3G
StormTek™
No Scale
Sheet:1 of 1
Plan View Section A
15
ATTACHMENT 2
BACKUP FOR PDP HYDROMODIFICATION CONTROL MEASURES
[This is the cover sheet for Attachment 2.] Indicate which Items are Included behind this cover sheet: Attachment Sequence Contents Checklist
Attachment 2a Hydromodification Management Exhibit (Required)
Included See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet.
Attachment 2b Management of Critical Coarse Sediment Yield Areas (WMAA Exhibit is required, additional
analyses are optional) See Section 6.2 of the BMP Design Manual.
Exhibit showing project drainage boundaries marked on WMAA
Critical Coarse Sediment Yield Area Map (Required)
Optional analyses for Critical Coarse Sediment Yield Area Determination
Appendix H.6.1 Verification of Geomorphic Landscape Units
Onsite
Appendix H.7 Downstream
Systems Sensitivity to Coarse Sediment Attachment 2c Geomorphic Assessment of Receiving Channels (Optional)
See Section 6.3.4 of the BMP Design Manual.
Not performed
Included
Attachment 2d Flow Control Facility Design and Structural BMP Drawdown Calculations (Required)
See Chapter 6 and Appendix G of the BMP Design Manual
Included
PROJECT ISHYDROMODIFICATION EXEMPT
PROJECT DOES NOT
CONTAIN CCSYA
Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit:
The Hydromodification Management Exhibit must identify:
Underlying hydrologic soil group
Approximate depth to groundwater
Existing natural hydrologic features (watercourses, seeps, springs, wetlands)
Critical coarse sediment yield areas to be protected (if present)
Existing topography
Existing and proposed site drainage network and connections to drainage offsite
Proposed grading
Proposed impervious features
Proposed design features and surface treatments used to minimize imperviousness
Point(s) of Compliance (POC) for Hydromodification Management
Existing and proposed drainage boundary and drainage area to each POC (when necessary, create separate exhibits for pre-development and post-project conditions)
Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail)
ATTACHMENT 2A - HYDROMODIFICATION EXEMPT EXHIBIT
HYDROMODIFICATION EXEMPTION
ANALYSES
FOR
SELECT CARLSBAD WATERSHEDS
September 17, 2015
Wayne W. Chang, MS, PE 46548
Chang
P.O. Box 9496
Rancho Santa Fe, CA 92067
(858) 692-0760
Project Location
ATTACHMENT 2b - WMAA EXHIBIT
FPC RESIDENTIAL
CRITIAL COARSE SEDIMENT YIELD EXHIBIT
Legend
PROJECT SITE
CCSYA
2000 ft
N
➤➤
N
PROJECT SITE
ATTACHMENT 3 Structural BMP Maintenance Information
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 3 must identify:
Typical maintenance indicators and actions for proposed structural BMP(s) based on Section 7.7 of the BMP Design Manual Final Design level submittal: Attachment 3 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 for BMPs subject to siltation or heavy trash(e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is . If required, posts or other markings shall be indicated and described on structural BMP plans.)
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
www.modularwetlands.com
Maintenance Guidelines for
Modular Wetland System - Linear
Maintenance Summary
o Remove Trash from Screening Device – average maintenance interval is 6 to 12 months.
(5 minute average service time).
o Remove Sediment from Separation Chamber – average maintenance interval is 12 to 24 months.
(10 minute average service time).
o Replace Cartridge Filter Media – average maintenance interval 12 to 24 months.
(10-15 minute per cartridge average service time).
o Replace Drain Down Filter Media – average maintenance interval is 12 to 24 months.
(5 minute average service time).
o Trim Vegetation – average maintenance interval is 6 to 12 months.
(Service time varies).
System Diagram
Access to screening device, separation
chamber and cartridge filter
Access to drain
down filter
Pre-Treatment
Chamber
Biofiltration Chamber
Discharge
Chamber
Outflow
Pipe
Inflow Pipe
(optional)
www.modularwetlands.com
Maintenance Procedures
Screening Device
1. Remove grate or manhole cover to gain access to the screening device in the Pre-
Treatment Chamber. Vault type units do not have screening device. Maintenance
can be performed without entry.
2. Remove all pollutants collected by the screening device. Removal can be done
manually or with the use of a vacuum truck. The hose of the vacuum truck will not
damage the screening device.
3. Screening device can easily be removed from the Pre-Treatment Chamber to gain
access to separation chamber and media filters below. Replace grate or manhole
cover when completed.
Separation Chamber
1. Perform maintenance procedures of screening device listed above before
maintaining the separation chamber.
2. With a pressure washer spray down pollutants accumulated on walls and cartridge
filters.
3. Vacuum out Separation Chamber and remove all accumulated pollutants. Replace
screening device, grate or manhole cover when completed.
Cartridge Filters
1. Perform maintenance procedures on screening device and separation chamber
before maintaining cartridge filters.
2. Enter separation chamber.
3. Unscrew the two bolts holding the lid on each cartridge filter and remove lid.
4. Remove each of 4 to 8 media cages holding the media in place.
5. Spray down the cartridge filter to remove any accumulated pollutants.
6. Vacuum out old media and accumulated pollutants.
7. Reinstall media cages and fill with new media from manufacturer or outside
supplier. Manufacturer will provide specification of media and sources to purchase.
8. Replace the lid and tighten down bolts. Replace screening device, grate or
manhole cover when completed.
Drain Down Filter
1. Remove hatch or manhole cover over discharge chamber and enter chamber.
2. Unlock and lift drain down filter housing and remove old media block. Replace with
new media block. Lower drain down filter housing and lock into place.
3. Exit chamber and replace hatch or manhole cover.
www.modularwetlands.com
Maintenance 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 require irrigation.
www.modularwetlands.com
Maintenance Procedure Illustration
Screening Device
The screening device is located directly
under the manhole or grate over the
Pre-Treatment Chamber. It’s mounted
directly underneath for easy access
and cleaning. Device can be cleaned by
hand or with a vacuum truck.
Separation Chamber
The separation chamber is located
directly beneath the screening device.
It can be quickly cleaned using a
vacuum truck or by hand. A pressure
washer is useful to assist in the
cleaning process.
www.modularwetlands.com
Cartridge Filters
The cartridge filters are located in the
Pre-Treatment chamber connected to
the wall adjacent to the biofiltration
chamber. The cartridges have
removable tops to access the
individual media filters. Once the
cartridge is open media can be
easily removed and replaced by hand
or a vacuum truck.
Drain Down Filter
The drain down filter is located in the
Discharge Chamber. The drain filter
unlocks from the wall mount and hinges
up. Remove filter block and replace with
new block.
www.modularwetlands.com
Trim Vegetation
Vegetation should be maintained in the
same manner as surrounding vegetation
and trimmed as needed. No fertilizer shall
be used on the plants. Irrigation
per the recommendation of the
manufacturer and or landscape
architect. Different types of vegetation
requires different amounts of
irrigation.
www.modularwetlands.com
Inspection Form
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E. Info@modularwetlands.com
For Office Use Only
(city) (Zip Code)(Reviewed By)
Owner / Management Company
(Date)
Contact Phone ( )_
Inspector Name Date / / Time AM / PM
Weather Condition Additional Notes
Yes
Depth:
Yes No
Modular Wetland System Type (Curb, Grate or UG Vault):Size (22', 14' or etc.):
Other Inspection Items:
Storm Event in Last 72-hours? No Yes Type of Inspection Routine Follow Up Complaint Storm
Office personnel to complete section to
the left.
2972 San Luis Rey Road, Oceanside, CA 92058 P (760) 433-7640 F (760) 433-3176
Inspection Report
Modular Wetlands System
Is the filter insert (if applicable) at capacity and/or is there an accumulation of debris/trash on the shelf system?
Does the cartridge filter media need replacement in pre-treatment chamber and/or discharge chamber?
Any signs of improper functioning in the discharge chamber? Note issues in comments section.
Chamber:
Is the inlet/outlet pipe or drain down pipe damaged or otherwise not functioning properly?
Structural Integrity:
Working Condition:
Is there evidence of illicit discharge or excessive oil, grease, or other automobile fluids entering and clogging the
unit?
Is there standing water in inappropriate areas after a dry period?
Damage to pre-treatment access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Damage to discharge chamber access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Does the MWS unit show signs of structural deterioration (cracks in the wall, damage to frame)?
Project Name
Project Address
Inspection Checklist
CommentsNo
Does the depth of sediment/trash/debris suggest a blockage of the inflow pipe, bypass or cartridge filter? If yes,
specify which one in the comments section. Note depth of accumulation in in pre-treatment chamber.
Is there a septic or foul odor coming from inside the system?
Is there an accumulation of sediment/trash/debris in the wetland media (if applicable)?
Is it evident that the plants are alive and healthy (if applicable)? Please note Plant Information below.
Sediment / Silt / Clay
Trash / Bags / Bottles
Green Waste / Leaves / Foliage
Waste:Plant Information
No Cleaning Needed
Recommended Maintenance
Additional Notes:
Damage to Plants
Plant Replacement
Plant Trimming
Schedule Maintenance as Planned
Needs Immediate Maintenance
www.modularwetlands.com
Maintenance Report
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E. Info@modularwetlands.com
For Office Use Only
(city) (Zip Code)(Reviewed By)
Owner / Management Company
(Date)
Contact Phone ( )_
Inspector Name Date / / Time AM / PM
Weather Condition Additional Notes
Site
Map #
Comments:
2972 San Luis Rey Road, Oceanside, CA 92058 P. 760.433.7640 F. 760.433.3176
Inlet and Outlet
Pipe Condition
Drain Down Pipe
Condition
Discharge Chamber
Condition
Drain Down Media
Condition
Plant Condition
Media Filter
Condition
Long:
MWS
Sedimentation
Basin
Total Debris
Accumulation
Condition of Media
25/50/75/100
(will be changed
@ 75%)
Operational Per
Manufactures'
Specifications
(If not, why?)
Lat:MWS
Catch Basins
GPS Coordinates
of Insert
Manufacturer /
Description / Sizing
Trash
Accumulation
Foliage
Accumulation
Sediment
Accumulation
Type of Inspection Routine Follow Up Complaint Storm Storm Event in Last 72-hours? No Yes
Office personnel to complete section to
the left.
Project Address
Project Name
Cleaning and Maintenance Report
Modular Wetlands System
SD-A Tree Well
E-3 Sept. 2021
SD-A Tree Well
(Source: County of San Diego LID Manual – EOA, Inc.)
Description
Trees planted to intercept rainfall and runoff as described in this fact sheet may be used as storm water
management measures to provide runoff reduction of the DCV per Appendix B.1.4. Additional
benefits associated with tree wells, include energy conservation, air quality improvement, and aesthetic
enhancement. Tree wells located in the City’s Right-of-Way are subject to the discretion of City
Engineer and Parks and Recreation Director. Typical storm water management benefits associated
with trees include:
• Treatment of storm water – Storm water from impervious area should be directed to the
tree wells. Trees provide treatment through uptake of nutrients and other storm water
pollutants (phytoremediation) and support of other biological processes that break down
pollutants
• Interception of rainfall – tree surfaces (roots, foliage, bark, and branches) intercept,
evaporate, store, or convey precipitation to the soil before it reaches surrounding impervious
surfaces
• Reduced erosion – trees protect denuded area by intercepting or reducing the velocity of rain
drops as they fall through the tree canopy
• Increased infiltration – soil conditions created by roots and fallen leaves promote infiltration
MS4 Permit Category
Site Design
Retention
Manual Category
Site Design
Infiltration
Applicable Performance
Standard
Site Design
Pollutant Control
Flow Control
Primary Benefits
Volume Reduction
SD-A Tree Well
E-4 Sept. 2021
Typical tree well system components include:
• Directing runoff from
impervious areas through a
drainage opening into a tree well
planting area.
• Trees of the appropriate species
for site conditions and
constraints. Refer to the Plant
List fact sheet (Appendix E.21).
• Available soil media reservoir
volume based on mature tree size,
soil type, water availability,
surrounding land uses, and
project goals
• Optional suspended pavement
design to provide structural
support for adjacent pavement
without requiring compaction of underlying layers
• Optional root barrier devices as needed; a root barrier is a device installed in the ground,
between a tree and the sidewalk or other structures, intended to guide roots down and away
from the sidewalk or structures in order to prevent damage from tree roots.
• Optional tree grates; to be considered to maximize available space for pedestrian circulation
and to protect tree roots from compaction related to pedestrian circulation; tree grates are
typically made up of porous material that will allow the runoff to soak through.
• Optional shallow surface depression for ponding of excess runoff
• Optional planter box underdrain
Design Adaptations for Project Goals
Site design BMP to provide incidental treatment. Tree wells primarily functions as site design
BMPs for incidental treatment.
Storm water pollutant control BMP to provide treatment. Project proponents are allowed to
design tree wells to reduce the volume of stormwater runoff that requires treatment, (the Design
Capture Volume [DCV]), or completely fulfill the pollutant control BMP requirements by retaining
the entire DCV. Benefits from tree wells are accounted for by using the volume reduction values in
Table B.1-3 presented in Appendix B. This credit can apply to other trees that are used for landscaping
purposes that meet the same criteria. Project proponents are required to provide calculations
supporting the amount of credit claimed from implementing trees within the project footprint. Tree
wells designed to completely fulfill the pollutant control BMP requirements by retaining the entire
Schematic of Tree Well
SD-A Tree Well
E-5 Sept. 2021
DCV are designated as SSD-BMPs and located in Appendix I.
Flow Control BMP to meet hydromodification requirements. Project proponents are also allowed
to design tree wells as a flow control BMP. Benefits from tree wells are accounted for by using the
DCV multipliers listed in Appendix I. Project proponents are required to provide calculations showing
that the entire DCV including the DCV multiplier is retained.
Design Criteria and Considerations
Tree Wells, whether designed as Site Design BMPs, as Stormwater Pollutant Control BMP, or as a
Flow Control BMP must meet the following design criteria and considerations, and if placed in the
right-of-way must be consistent with the County of San Diego Green Streets Standard Drawings.
Deviations from the below criteria may be approved at the discretion of the City Engineer if it is
determined to be appropriate:
Siting and Design Intent/Rationale
□
Tree species is appropriately chosen for the
development (private or public). For public
rights-of-ways, city planning guidelines and
zoning provisions for the permissible species
and placement of trees are consulted. A list of
trees appropriate for site design are provided in
Appendix E.21
Proper tree placement and species
selection minimizes problems such as
pavement damage by surface roots and
poor growth.
□ Tree well placement: ensure area is graded;
and the well is located so that full amount of
DCV reduction drains to well.
Minimizes short-circuiting of run off and
assures DCV reductions are retained
onsite.
□
Location of trees planted along public streets
follows city requirements and guidelines.
Vehicle and pedestrian line of sight are
considered in tree selection and placement.
Location of trees planted within private
development follows city landscape guidelines.
Building setbacks, utility alignments, vehicle
and pedestrian line of sight are considered in
tree selection and placement.
Unless otherwise approved by the City
Engineer the following minimum tree
separation distance is followed
Roadway safety for both vehicular and
pedestrian traffic is a key consideration
for placement along public streets.
SD-A Tree Well
E-6 Sept. 2021
Siting and Design Intent/Rationale
Improvement
Minimum
distance to
Tree Well
Traffic Signal, Stop sign 20 feet
Underground Utility lines
(except sewer) 5 feet
Sewer Lines 10 feet
Above ground utility
structures (Transformers,
Hydrants, Utility poles, etc.)
10 feet
Driveways 10 feet
Intersections (intersecting
curb lines of two streets) 25 feet
□
Underground utilities and overhead wires
are considered in the design and avoided or
circumvented. Underground utilities are routed
around or through the planter in suspended
pavement applications. All underground
utilities are protected from water and root
penetration.
Tree growth can damage utilities and
overhead wires resulting in service
interruptions. Protecting utilities routed
through the planter prevents damage and
service interruptions.
□
Suspended pavement is used for confined
Tree Well soil volume. Suspended pavement
design was developed where appropriate to
minimize soil compaction and improve
infiltration and filtration capabilities.
Suspended pavement was constructed with an
approved structural cell.
Suspended pavement designs provide
structural support without compaction
of the underlying layers, thereby
promoting tree growth.
Recommended structural cells include
poured in place concrete columns, Silva
Cells manufactured by Deeproot Green
Infrastructures and Stratacell and
Stratavault systems manufactured by
Citygreen Systems or approved equal.
Suspended pavement shall not be used
within the city’s right-of-way and
easements.
□ A minimum soil volume of 2 cubic feet per
square foot of canopy projection volume is
provided for each tree. Canopy projection area
The minimum soil volume ensures that
there is adequate storage volume to
allow for unrestricted evapotranspiration
and infiltration.
SD-A Tree Well
E-7 Sept. 2021
Siting and Design Intent/Rationale
is the ground area beneath the tree, measured at
the drip line. Soil volume must be within 1.5
times the mature tree canopy radius. Soil depth
shall be a minimum of 30 inches deep,
preferably 36 inches deep. When placing tree
well next to curbs or other structures use
Structural Soil as outlined in the section below
titled “Confined Tree Well Soil Volume”. Use
Amended Soil per Fact Sheet SD-F in all other
cases.
□ DCV from the tributary area draining to the
tree is equal to or greater than the tree credit
volume
The minimum tributary area ensures that
the tree receives enough runoff to fully
utilize the infiltration and
evapotranspiration potential provided. In
cases where the minimum tributary area
is not provided, the tree credit volume
must be reduced proportionately to the
actual tributary area.
□
Inlet opening to the tree that is at least 18
inches wide.
A minimum 2 inch drop in grade from the inlet
to the finish grade of the tree.
Grated inlets are allowed for pedestrian
circulation. Grates need to be ADA compliant
and have sufficient slip resistance.
Design requirement to ensure that the
runoff from the tributary area is not
bypassed.
Different inlet openings and drops in
grade may be allowed at the discretion of
the City Engineer if calculations are
shown that the diversion flow rate
(Appendix B.4.4) from the tributary area
can be conveyed to the tree. In cases
where the inlet capacity is limiting the
amount of runoff draining to the tree,
the tree credit volume must be reduced
proportionately.
Conceptual Design and Sizing Approach for Site Design
Determine the areas where tree wells can be used in the site design to achieve incidental treatment.
Tree wells reduce runoff volumes from the site. Refer to Appendix B.1. Document the proposed tree
locations in the SWQMP.
For conceptual design and sizing approach for pollutant control and flow control, refer to Appendix
I.
SD-A Tree Well
E-8 Sept. 2021
Tree Planting Design in New or Reconstructed Streetscapes
1. Maximized open soil area for tree planting is the most cost effective method of achieving
the required soil volume.
2. Tree wells within sidewalks shall have a minimum open area of four feet wide by six feet
long. Larger areas may be required to accommodate large root balls.
3. Tree well soil characteristics shall meet the requirements of SD-F Amended Soil.
Structural Requirements for Confined Tree Well Soil Volume
In order to provide adequate soil volume for tree wells, soils may be placed confined beneath adjacent
paved surfaces. Acceptable soil systems capable of carrying D-50 loading include structural soils,
structural slabs, and structural cells:
1. Structural soil systems include CU-StructuralSoilTM, Stalite Structural Soil, or equivalent.
2. Suspended pavements that allow uncompacted growing soil beneath the sidewalk include;
structural slabs that span between structural supports, structural cells, and other
commercially available structural systems. Manufacturer details and certification must be
provided for commercial systems. Structural calculations and details must be provided for
structural slab installations. Structural cells are commercially-available structural systems
placed subsurface that support the sidewalk and are filled with amended soil (SD-F).
Manufacturer details and certification must be provided for commercial systems.
Suspended pavement shall not be used within the city’s right-of-way and easements.
Stormwater Retention and Treatment Volume
Tree wells with expanded soil volume will serve as a method of capturing and retaining the required
volume of stormwater in accordance with City requirements in Appendix B of this manual. These
facilities can be designed to meet the City requirements when surface ponding volume is provided,
whether designed as an enclosed plant bed with covered soil volume, or a continuous open area (either
mulched or with turf) with soil volume under the adjacent sidewalk.
Maintenance Overview
Normal Expected Maintenance. Tree health shall be maintained as part of normal landscape
maintenance. Additionally, ensure that storm water runoff can be conveyed into the tree well as
designed. That is, the opening that allows storm water runoff to flow into the tree well (e.g., a curb
opening, tree grate, or surface depression) shall not be blocked, filled, re-graded, or otherwise changed
in a manner that prevents storm water from draining into the tree well. A summary table of standard
inspection and maintenance indicators is provided within this Fact Sheet.
Non-Standard Maintenance or BMP Failure. Trees wells are site design BMPs that normally do
not require maintenance actions beyond routine landscape maintenance. The normal expected
SD-A Tree Well
E-9 Sept. 2021
maintenance described above ensures the BMP functionality. If changes have been made to the tree
well entrance / opening such that runoff is prevented from draining into the tree well (e.g., a curb
inlet opening is blocked by debris or a grate is clogged causing runoff to flow around instead of into
the tree well, or a surface depression has been filled so runoff flows away from the tree well), the BMP
is not performing as intended to protect downstream waterways from pollution and/or erosion.
Corrective maintenance will be required to restore drainage into the tree well as designed.
Surface ponding of runoff directed into tree wells is expected to infiltrate/evapotranspire within 24-
96 hours following a storm event. Surface ponding longer than approximately 24 hours following a
storm event may be detrimental to vegetation health, and surface ponding longer than approximately
96 hours following a storm event poses a risk of vector (mosquito) breeding. Poor drainage can result
from clogging or compaction of the soils surrounding the tree. Loosen or replace the soils to restore
drainage.
Other Special Considerations. Site design BMPs, such as tree wells, installed within a new
development or redevelopment project are components of an overall storm water management
strategy for the project. The presence of site design BMPs within a project is usually a factor in the
determination of the amount of runoff to be managed with structural BMPs (i.e., the amount of runoff
expected to reach downstream retention or biofiltration basins that process storm water runoff from
the project as a whole). When site design BMPs are not maintained or are removed, this can lead to
clogging or failure of downstream structural BMPs due to greater delivery of runoff and pollutants
than intended for the structural BMP. Therefore, the City Engineer may require confirmation of
maintenance of site design BMPs as part of their structural BMP maintenance documentation
requirements. Site design BMPs that have been installed as part of the project should not be removed,
nor should they be bypassed by re-routing roof drains or re-grading surfaces within the project. If
changes are necessary, consult the City Engineer to determine requirements.
ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit
[Use the City’s standard Single Sheet BMP Plan.]
S
S
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SD SD
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///
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ROS 29310
POC-A
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AP
P
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O
V
A
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7
PERMANENT WATER QUALITY
TREATMENT FACILITY
KEEPING OUR WATERWAYS CLEAN
MAINTAIN WITH CARE - NO MODIFICATIONS WITHOUT AGENCY
APPROVAL
100
LEGEND
GRAPHIC SCALE: 1" = 30'
0 30 60 90
100
PROPERTY BOUNDARY
RIGHT-OF-WAY
STREET CENTERLINE
DRAINAGE PATH OF TRAVEL
EXISTING CONTOUR
PROPOSED CONTOUR
PROPOSED BUILDING
PROPOSED HARDSCAPE
PROPOSED LANDSCAPE AREA
PROPOSED ROAD/AC PAVEMENT
SELF MITIGATING AREA
PROPOSED POST-CONSTRUCTION BMP
PROPOSED TREE WELL
BMP TYPEBMP ID #SYMBOL CASQA NO.DRAWING NO.SHEET NO.(S)MAINTENANCE
FREQUENCY
BMP TABLE
CERTIFICATION
INSPECTION
FREQUENCYQUANTITY
TREATMENT CONTROL
SOURCE CONTROL
1 MODULAR
WETLAND MP-40 4 (EA.)543-6A
STENCILS3 SD-13DRAINS TO OCEANNO DUMPING
**
SIGNATURE
SITE DESIGN
TC-50 QUARTERLY QUARTERLY
BMP NOTES:
1.THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S RECOMMENDATIONS AND/OR THESE PLANS.
2.NO CHANGES TO THE PROPOSED BMPS ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE CITY ENGINEER.
3.NO SUBSTITUTIONS TO THE MATERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL FROM THE CITY
ENGINEER.
4.NO OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS PROJECT FOR
APPROPRIATE BMP CONSTRUCTION AND INSTALLATION.
5.REFER TO MAINTENANCE AGREEMENT DOCUMENT.
6.SEE PROJECT SWQMP FOR ADDITIONAL INFORMATION.
BMP CONSTRUCTION AND INSPECTION NOTES:
THE EOW WILL VERIFY THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING IN COMPLIANCE WITH THE APPLICABLE
REQUIREMENTS. PRIOR TO OCCUPANCY THE EOW MUST PROVIDE:
1.PHOTOGRAPHS OF THE INSTALLATION OF PERMANENT BMPS PRIOR TO CONSTRUCTION, DURING CONSTRUCTION, AND
AT FINAL INSTALLATION.
2.A WET STAMPED LETTER VERIFYING THAT PERMANENT BMPS ARE CONSTRUCTED AND OPERATING PER THE
REQUIREMENTS OF THE APPROVED PLANS.
3.PHOTOGRAPHS TO VERIFY THAT PERMANENT WATER QUALITY TREATMENT SIGNAGE HAS BEEN INSTALLED. PRIOR TO
RELEASE OF SECURITIES, THE DEVELOPER IS RESPONSIBLE FOR ENSURING THE PERMANENT BMPS HAVE NOT BEEN
REMOVED OR MODIFIED BY THE NEW HOMEOWNER OR HOA WITHOUT THE APPROVAL OF THE CITY ENGINEER.
PLAN PREPARED BY:
NAME: TYLER G. LAWSON
COMPANY: PLSA ENGINEERING
ADDRESS: 1911 SAN DIEGO AVE. SAN DIEGO, CA 92110
PHONE NO.: (858) 259-8212
PARTY RESPONSIBLE FOR MAINTENANCE:
NAME: FENTON PONTO, LLC
ADDRESS: 7577 MISSION VALLEY RD
CONTACT: RYLEY WEBB
PHONE NO.: (619) 400-0120
2 STREET
TREE 3-6 TIMES/YEARTC-12 20 (EA.)AS NEEDED
SEMI-ANNUALLY
& AS NEEDED
MONTHLY DURING
WET SEASON
4 STORM
DRAIN INLET
5 6" AREA DRAIN
6 TRASH CAPTURE
STORMTEK ST3
REVISION DESCRIPTION CITY APPROVAL
INITIALDATE
ENGINEER OF WORK
INITIALDATE
ENGINEERING DEPARTMENT
DRAWING NO.PROJECT NO.
CHKD BY:
DWN BY:
APPROVED:
DATE INITIAL
RVWD BY:
"AS BUILT"
DATE
INSPECTOR DATE
REVIEWED BY:
P.E.EXP.
1
ENGINEERING MANAGER RCE 63912 EXPIRES 9/30/24
JASON S. GELDERT
DATE
OTHER APPROVAL
SHEETSSHEET
GRADING PLANS FOR:
J:\ACTIVE JOBS\3754 FENTON-PONTO RD\CIVIL\DRAWING\GRADING PLANS
22
SDP 2022-0003
GR 2023-0029
543-6ADATE
2/01/2024
TYLER G. LAWSON R.C.E. NO. 80356 EXP. 12/31/2024
17
BMP PLAN
3 (EA)
2 (EA)
10
SUSTAINABLE
LANDSCAPING
(SD-K)
7 WATER QUALITY
SIGNAGE
543-6A
543-6A
543-6A
543-6A
543-6A
543-6A
543-6A
6-14
6-14
6-14
6-14
6-14
6-14
6-14
6-14
4 (EA.)
5 (EA)
102 (EA)
55,841 (SF)ANNUALLY MONTHLY
ANNUALLY AS-NEEDED
ANNUALLY AS-NEEDED
ANNUALLY AS-NEEDED
ANNUALLY AS-NEEDED
WATER QUALITY SIGN (12"X18" MIN) - TYPICAL DETAIL
C80356