HomeMy WebLinkAboutPD 2020-0047; HARLE RESIDENCE; PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP); 2021-06-24TABLE 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
Attachment 1d: Categorization of Infiltration Feasibility Condition
Attachment 1e: Pollutant Control BMP Design Worksheets / Calculations
Attachment 2: Structural BMP Maintenance Thresholds and Actions
Attachment 3: Single Sheet BMP (SSBMP) Exhibit
PROJECT VICINITY MAP
City’s Storm Water Standard Questionnaire (Form E-34)
E-34 Page 1 of 4 REV 03/19
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
STORM WATER STANDARDS
QUESTIONNAIRE
E-34
INSTRUCTIONS:
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 or be subject to ‘PRIORITY
DEVELOPMENT PROJECT’ (PDP) 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: PROJECT ID:
ADDRESS: APN:
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.
E-34 Page 2 of 4 REV 03/19
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 5, mark the third 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; OR
b) 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 USEPA
Green Streets guidance?
2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in
accordance 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 5, 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 03/19
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 surfaces
collectively 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 of impervious 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
of impervious 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 hillside
development 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
of impervious 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 more
of impervious street, road, highway, freeway or driveway surface collectively over the entire project
site? 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
of impervious surface collectively over the entire site, and discharges directly to an Environmentally
Sensitive 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 square
feet 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 square
feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes
RGO’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 land
and 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%? (CMC
21.203.040)
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, check the first box stating “My project is a PDP …”
and complete applicant information.
If you answered “no” to all of the above questions, your project is a ‘STANDARD PROJECT.’ Go to step 5, check the
second box stating “My project is a ‘STANDARD PROJECT’…” and complete applicant information.
STEP4
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP)
Q~LY
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. D D
Total proposed newly created or replaced impervious area (B)= sq. ft.
Percent impervious area created or replaced (B/A)*1 00 = %
If you answered "yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious
Sill'face and noflhe entire development. Go to sl ep 5, check the fifst box stating "My project is a PDP ... " and complefe
applicant information.
If you answered "no," the structural BMP's required for PDP apply to the entire development. Go to step 5, check the
check the first box stating "My project is a PDP ... "and complete applicant information.
STEPS --CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
~ 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) for submittal at time of application .
0 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.
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.
D 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: Kent Harle 4-= .A.pp!!ce!"!t Title: Owner
Applicant Signature: ~,.,-l ,__ Date: ~L'21
.. .. * Environmentally Sens1t1ve Areas mclude but are not hm1ted to all Clean Water Act Section 303(d) 1mpa1red water bod1es, areas designated as Areas of Spec1al
Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies
designated 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
Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City.
This Box for City Use Only
YES NO
City Concurrence: D D
By:
Date:
Project ID:
E-34 Page 4 of4 REV 03/19
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Harle Residence
Project ID PD2020-0047
Project Address 4547 Cove Drive
Carlsbad, CA 92008
Assessor's Parcel Number(s) (APN(s))207-150-15
Project Watershed (Hydrologic Unit) Carlsbad – Los Manos (904.31)
Parcel Area
_0.107___ Acres (_4,676_____ Square Feet)
Existing Impervious Area
(subset of Parcel Area)
_0.000___ Acres (_0_____ Square Feet)
Area to be disturbed by the project
(Project Area)
_0.107___ Acres (_4,676_____ Square Feet)
Project Proposed Impervious Area
(subset of Project Area)
_0.077___ Acres (_3,354_____ Square Feet)
Project Proposed Pervious Area
(subset of Project Area)
_0.030___ Acres (_1,322______ Square Feet)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the
Project.
This may be less than the Parcel Area.
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 site contains an auto dealership.
Existing Land Cover Includes (select all that apply):
☒ Vegetative Cover
☐ Non-Vegetated Pervious Areas
☐ Impervious Areas
Description / Additional Information:
Existing site’s pervious area is naturally vegetated.
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]:
The existing site is lightly sloped down to the east. The site sits along the Agua Hedionda
Lagoon and all stormwater sheet flows north to the lagoon. The conveyance is over vacant land;
however, the lot is graded.
There are no existing storm water conveyance systems.
No offsite run-ons are conveyed through the site.
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities:
The project will construct a single family home. The property is zoned for residential waterway
(R-W) development and is located in the Deferred Certification area of the Coastal Zone. As
such, the project will require a coastal development permit from the California Coastal
Commission.
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking
lots, courtyards, athletic courts, other impervious features):
The proposed building and patios will be impervious. The driveway and walkways will be
impervious pavers. All onsite impervious surfaces will be directed to one of two onsite treatment
basins.
List/describe proposed pervious features of the project (e.g., landscape areas):
The proposed pervious areas include landscape areas and biofiltration basins.
Does the project include grading and changes to site topography?
☒ Yes
No
Description / Additional Information:
The project will change the existing grades to create a new building footprint, patios, and
landscaped areas onsite. The proposed site will minimize grading to the maximum extent
possible to maintain similar topography and drainage as the existing condition.
Does the project include changes to site drainage (e.g., installation of new storm water
conveyance systems)?
☒ Yes
No
Description / Additional Information:
The proposed development will maintain the same drainage pattern as the existing to the
maximum extent possible. Biofiltration basins are proposed. All storm water will still discharge
directly to the Agua Hedionda Lagoon.
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):
Biofiltration basin drain to an abutting navigable canal that provides direct access to the Aqua
Hedionda Lagoon. The lagoon flows into the Pacific Ocean.
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
Agua Hedionda Lagoon Enterpcpccis, Fecal Coliform,
Manganese, Phosphorus,
Selenium, TDS, Total Nitrogen,
Aquatic Toxicity
Identification of Project Site Pollutants
Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see
BMP Design Manual Appendix B.6):
Pollutant
Not Applicable to
the Project Site
Anticipated from the
Project Site
Also a Receiving
Water Pollutant of
Concern
Sediment X X
Nutrients X
Heavy Metals X
Organic Compounds X
Trash & Debris X
Oxygen Demanding
Substances X
Oil & Grease X
Bacteria & Viruses X X
Pesticides X
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):
The site discharges directly into the Agua Hedionda Lagoon.
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 Section 6.2 of the BMP Design Manual
been performed?
6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite
6.2.2 Downstream Systems Sensitivity to Coarse Sediment
6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite
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 6.2.4 and 6.2.5 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.
N/A
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:
N/A
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.
N/A
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.
N/A
City’s Standard Project Requirement Checklist Form E-36
E-36 Page 1 of 4 Revised 09/16
Development Services
Land Development Engineering
1635 Faraday Avenue
(760) 602-2750
www.carlsbadca.gov
STANDARD PROJECT
REQUIREMENT
CHECKLIST
E-36
Project Information
Project Name:
Project ID:
DWG No. or Building Permit No.:
Source Control BMPs
All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See
Chapter 4 and Appendix E.1 of the BMP Design Manual (Volume 5 of City Engineering Standards) for information to
implement source control BMPs shown in this checklist.
Answer each category below pursuant to the following.
"Yes" means the project will implement the source control BMP as described in Chapter 4 and/or Appendix E.1 of the
Model BMP Design Manual. Discussion/justification is not required.
"No" means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
"N/A" means the BMP is not applicable at the project site because the project does not include the feature that is
addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be
provided.
Source Control Requirement Applied?
SC-1 Prevention of Illicit Discharges into the MS4 Yes No N/A
Discussion/justification if SC-1 not implemented:
SC-2 Storm Drain Stenciling or Signage Yes No N/A
Discussion/justification if SC-2 not implemented:
SC-3 Protect Outdoor Materials Storage Areas from Rainfall, Run-On, Runoff, and Wind
Dispersal Yes No N/A
Discussion/justification if SC-3 not implemented:
E-36 Page 2 of 4 Revised 09/16
Source Control Requirement (continued) Applied?
SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall, Run-On, Runoff, and
Wind Dispersal Yes No N/A
Discussion/justification if SC-4 not implemented:
SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal Yes No N/A
Discussion/justification if SC-5 not implemented:
SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and
identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance).
On-site storm drain inlets Yes No N/A
Interior floor drains and elevator shaft sump pumps Yes No N/A
Interior parking garages Yes No N/A
Need for future indoor & structural pest control Yes No N/A
Landscape/Outdoor Pesticide Use Yes No N/A
Pools, spas, ponds, decorative fountains, and other water features Yes No N/A
Food service Yes No N/A
Refuse areas Yes No N/A
Industrial processes Yes No N/A
Outdoor storage of equipment or materials Yes No N/A
Vehicle and Equipment Cleaning Yes No N/A
Vehicle/Equipment Repair and Maintenance Yes No N/A
Fuel Dispensing Areas Yes No N/A
Loading Docks Yes No N/A
Fire Sprinkler Test Water Yes No N/A
Miscellaneous Drain or Wash Water Yes No N/A
Plazas, sidewalks, and parking lots Yes No N/A
For “Yes” answers, identify the additional BMP per Appendix E.1. Provide justification for “No” answers.
E-36 Page 3 of 4 Revised 09/16
Site Design BMPs
All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See
Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (Volume 5 of City Engineering Standards) for information
to implement site design BMPs shown in this checklist.
Answer each category below pursuant to the following.
"Yes" means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of
the Model BMP Design Manual. Discussion / justification is not required.
"No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be
provided. Please add attachments if more space is needed.
"N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is
addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be
provided.
Site Design Requirement Applied?
SD-1 Maintain Natural Drainage Pathways and Hydrologic Features Yes No N/A
Discussion/justification if SD-1 not implemented:
SD-2 Conserve Natural Areas, Soils, and Vegetation Yes No N/A
Discussion/justification if SD-2 not implemented:
SD-3 Minimize Impervious Area Yes No N/A
Discussion/justification if SD-3 not implemented:
SD-4 Minimize Soil Compaction Yes No N/A
Discussion/justification if SD-4 not implemented:
SD-5 Impervious Area Dispersion Yes No N/A
Discussion/justification if SD-5 not implemented:
E-36 Page 4 of 4 Revised 09/16
Site Design Requirement (continued) Applied?
SD-6 Runoff Collection Yes No N/A
Discussion/justification if SD-6 not implemented:
SD-7 Landscaping with Native or Drought Tolerant Species Yes No N/A
Discussion/justification if SD-7 not implemented:
SD-8 Harvesting and Using Precipitation Yes No N/A
Discussion/justification if SD-8 not implemented:
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). Both
storm water pollutant control and flow control for hydromodification management can 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, indicate whether
pollutant control and flow control BMPs are integrated together or separate.
An infiltration BMP is not feasible because the underlining soil is type “D”. Per geotechnical
report by Construction Testing and Engineering dated February 26, 2021, shallow groundwater
is present at the site. Since groundwater mounding potential exists at the site, infiltration water
could potentially impact the lagoon. See completed form I-8. This project will use biofiltration
basin as treatment control BMP’s. The basin is sized using worksheet B.5-1.
Structural BMP Summary Information
[Copy this page as needed to provide information for each individual proposed
structural BMP]
Structural BMP ID No. BMP-1
DWG: 527-7A ______ Sheet No.: 2 __________
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)
☐ Partial retention by biofiltration with partial retention (PR-1)
☒ Biofiltration (BF-1)
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
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
Other (describe in discussion section below)
Discussion (as needed):
Per BMP spreadsheet, the drawdown time of the surface has been met to comply with the DEH
drawdown guidelines for vector control. The project will incorporate the basin to treat the 85th
percentile storm event.
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 I-7, Harvest and Use Feasibility
Screening Checklist (Required unless
the entire project will use infiltration
BMPs)
Refer to Appendix B.3-1 of the BMP
Design Manual to complete Form I-7.
☐ Included
☒ Not included because the entire
project will use infiltration BMPs
Attachment 1d Form I-8, Categorization of Infiltration
Feasibility Condition (Required unless
the project will use harvest and use
BMPs)
Refer to Appendices C and D of the
BMP Design Manual to complete
Form I-8.
☒ 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 and E of the
BMP Design Manual for structural
pollutant control BMP design
guidelines
☒ Included
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)
110 COPPERWOOD WAY, SUITE P, OCEANSIDE, CA 92058
PH: 760-908-8745 ● info@civillandworks.com
I-8
I-8
X
The NRCS soils across the site are all Type D soils with very high surface runoff. Three soil types
were present in the area of the proposed development, Quaternary Previously Placed Fill, Young
Alluvial Flood Plain Deposits, and Tertiary Santiago Formation.
Percolation testing was not performed due to shallow groundwater (six feet bgs).
X
Shallow groundwater was encountered at the site and the site is located adjacent to Agua Hedionda
Lagoon, therefore groundwater mounding potential exists at the site.
I-8
I-8 X
Due to shallow groundwater at the site, infiltrating stormwater could potentially impact
groundwater.
X
The site is located adjacent to Agua Hedionda Lagoon, therefore infiltrating water could
potentially impact the lagoon.
No Full
I-8
X
The site is not suitable for infiltration due to shallow groundwater and proximity to Agua
Hedionda Lagoon.
X
Shallow groundwater was encountered at the site and the site is located adjacent to Agua
Hedionda Lagoon, therefore groundwater mounding potential exists at the site.
I-8
X
Due to shallow groundwater at the site, infiltrating stormwater could potentially impact
groundwater.
X
The site is located adjacent to Agua Hedionda Lagoon, therefore infiltrating water could
potentially impact the lagoon.
No Inf.
DMA SUMMARY
EX
DMA ID Type Total Area Total Area Runoff Factor C*A C Factor
SF Acres
EX Natural (D Soil) 4,676 0.107 0.35 1636.6
EX Impervious 0 0.000 0.9 0
TOTAL 4,676 0.107 1,637 0.35
BMP-1
DMA ID Type Total Area Total Area Runoff Factor C*A C Factor
SF Acres
DMA-1.1 Roof 2,371 0.054 0.9 2133.9
DMA-1.2 Impervious concrete pavers 983 0.023 0.9 884.7
DMA-1.3 Landscape 667 0.015 0.35 233.5
TOTAL 4,021 0.092 C=3,252 0.81
DMA ID Type Total Area Total Area Runoff Factor C*A C Factor
SF Acres
DMA-3.1 Self Mitigating 655 0.015 0.35 229.3
TOTAL 655 0.015 C=229 0.35
Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs - DMA-1
185th percentile 24-hr storm depth from Figure B.1-1 d=0.61 inches
2 Area tributary to BMP (s) A=0.092 acres
3 Area weighted runoff factor (estimate using Appendix B.1.1 and B.2.1) C=0.81 unitless
4 Tree wells volume reduction TCV=0 cubic-feet
5 Rain barrels volume reduction RCV=0 cubic-feet
6 Calculate DCV = (3630 x C x d x A) – TCV - RCV DCV=165 cubic-feet
Storm Water Standards
January 2016 Edition B-10
Design Capture Volume Worksheet B.2-1
Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs - DMA-1
1 165 cubic-
feet
2 0.00 in/hr.
3 36 hours
4 0 inches
5 0.40 in/in
6 0 inches
7 50 sq-ft
8 0.1 in/in
9 8.75 cubic-
feet
10 157 cubic-
feet
11 6 inches
12 21 inches
13
10 inches
14 0.2 in/in
15
5.00 in/hr.
16 6 hours
17 30.00 inches
18 14.2 inches
19 44.20 inches
20 234.84 cubic- feet
21 64 sq-ft
22 117.42191 cubic- feet
23 99 sq-ft
24 4,021 sq-ft
25 0.81
26 98 sq-ft
27 98 sq-ft
Area draining to the BMP
Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and B.2)
Minimum BMP Footprint [Line 24 x Line 25 x 0.03]
Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line 26)
Required biofiltered volume [1.5 x Line 10]
Required Footprint [Line 20/ Line 19] x 12
Option 2 - Store 0.75 of remaining DCV in pores and ponding
Required Storage (surface + pores) Volume [0.75 x Line 10]
Required Footprint [Line 22/ Line 18] x 12
Footprint of the BMP
Simple Sizing Method for Biofiltration BMPs Worksheet B.5-1
Remaining DCV after implementing retention BMPs
Partial Retention
Infiltration rate from Form I-9 if partial infiltration is feasible
Option 1 – Biofilter "1.5" times the DCV
Media retained pore storage
Volume retained by BMP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7
DCV that requires biofiltration [Line 1 – Line 9]
BMP Parameters
Surface Ponding [6 inch minimum, 12 inch maximum]
Allowable Routing Time for sizing
Depth filtered during storm [ Line 15 x Line 16]
Depth of Detention Storage
[Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)]
Total Depth Treated [Line 17 + Line 18]
Media Thickness [18 inches minimum], also add mulch layer thickness to this
line for sizing calculations
Aggregate Storage above underdrain invert (12 inches typical) – use 0 inches for
sizing if the aggregate is not over the entire bottom surface area
Media available pore space
Media filtration rate to be used for sizing (5 in/hr. with no outlet control; if the
filtration is controlled by the outlet, use the outlet controlled rate)
Baseline Calculations
Allowable drawdown time for aggregate storage below the underdrain
Depth of runoff that can be infiltrated [Line 2 x Line 3]
Aggregate pore space
Required depth of gravel below the underdrain [Line 4/ Line 5]
Assumed surface area of the biofiltration BMP
ATTACHMENT 2
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 2 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 2 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
Page 1
Operation and Maintenance Plan for the Stormwater Quality BMP Facilities
for
HARLE RESIDENCE – SWQMP
January 14, 2021
I. PURPOSE
The primary purpose of this Operations & Maintenance Plan (O&M Plan) shall be to
provide a routine maintenance program that maintains the treatment facilities
effectiveness.
II. COVERAGE AREA
This project will utilize 1 primary treatment facility type located on-site:
1. Biofiltration Basins – located along the northwest of the building and along the
eastern property line.
The biofiltration basins will treat all onsite stormwater. The basins will be walled and
concrete lined bottom. The basin will have perforated pipe and an overflow riser
connecting to an outlet pipe. The overflow riser is 24”x24” with a minimum of 6” of
freeboard. Proper maintenance on the BMP system to allow for the effectiveness of the
treatment basin and to prevent storm pipe clogging.
III. ROUTINE MAINTENANCE ACTIVITIES
Primary maintenance activities include vegetation management, trash and sediment
removal, irrigation maintenance and storm drain outlet inspections. The basins are
designed to fully drain within 24-72 hours and not include permanent pools or standing
water. Routine maintenance activities, and the frequency at which they will be
conducted, are shown in Table 1 below.
NOTE: Landscape Maintenance Plan should also be reviewed for consistency with vegetation
maintenance and any applicable needs for specific plants, shrubs or trees.
Page 2
Table 1
Routine Maintenance Activities for Basins
No. Maintenance Task Frequency of Task
1
Conduct annual vegetation management during the summer,
removing weeds and harvesting vegetation. Remove all grass
cuttings and other green waste.
Once a year
2
Trim vegetation at beginning and end of wet season to prevent
establishment of woody vegetation, and for aesthetics and
mosquito control.
Twice a year (spring and fall)
3 Evaluate health of vegetation and remove or replace any dead or
dying plants. Remove all green waste and dispose of properly. Twice a year
4 Remove accumulated trash and debris from the middle and end
of the wet season and dispose of trash and debris properly. Twice a year (January and April)
5 Irrigate during dry weather. Per Landscape Plans
6 Inspect basins using the attached inspection checklists. Quarterly, or as needed
IV. PROHIBITIONS
The use of pesticides and quick release fertilizers shall be minimized, and the principles
of integrated pest management (IPM) followed:
1. Employ non-chemical controls (biological, physical and cultural controls)
before using chemicals to treat a pest problem.
2. Prune plants properly and at the appropriate time of year.
3. Provide adequate irrigation for landscape plants. Do not over water.
4. Limit fertilizer use unless soil testing indicates a deficiency. Slow-release or
organic fertilizer is preferable. Check with municipality for specific
requirements.
5. Pest control should avoid harming non-target organisms, or negatively
affecting air and water quality and public health. Apply chemical controls only
when monitoring indicates that preventative and non-chemical methods are
not keeping pests below acceptable levels. When pesticides are required,
apply the least toxic and the least persistent pesticide that will provide
adequate pest control. Do not apply pesticides on a prescheduled basis.
6. Sweep up spilled fertilizer and pesticides. Do not wash away or bury such
spills.
7. Do not over apply pesticide. Spray only where the infestation exists. Follow
the manufacturer’s instructions for mixing and applying materials.
8. Only licensed, trained pesticide applicators shall apply pesticides.
9. Apply pesticides at the appropriate time to maximize their effectiveness and
minimize the likelihood of discharging pesticides into runoff. With the
exception of pre-emergent pesticides, avoid application if rain is expected.
Page 3
10. Unwanted/unused pesticides shall be disposed as hazardous waste.
V. INSPECTIONS
The attached Inspection and Maintenance Checklists shall be used to conduct
inspections monthly (or as needed), identify needed maintenance, and record
maintenance that is conducted.
Page 4 Basin Inspection and Maintenance Checklist Property Address: Property Owner: Treatment Measure No.: Date of Inspection: Type of Inspection: Monthly Pre-Wet Season After heavy runoff End of Wet Season Inspector(s): Other: Defect Conditions When Maintenance Is Needed Maintenance Needed? (Y/N)Comments (Describe maintenance completed and if any needed maintenance was not conducted, note when it will be done.) Results Expected When Maintenance Is Performed General Trash & Debris Trash and debris accumulated in basin. Visual evidence of dumping. Trash and debris cleared from site and disposed of properly. Poisonous Vegetation and noxious weeds Poisonous or nuisance vegetation or noxious weeds, e.g., morning glory, English ivy, reed canary grass, Japanese knotweed, purple loosestrife, blackberry, Scotch broom, poison oak, stinging nettles, or devil’s club. Use Integrated Pest Management techniques to control noxious weeds or invasive species. Contaminants and Pollution Any evidence of oil, gasoline, contaminants or other pollutants. No contaminants or pollutants present. Rodent Holes If facility acts as a dam or berm, any evidence of rodent holes, or any evidence of water piping through dam, berm or into slopes via rodent holes. The design specifications are not compromised by holes. Any rodent control activities are in accordance with applicable laws and do not affect any protected species. Insects Insects such as wasps and hornets interfere with maintenance activities. Insects do not interfere with maintenance activities.
Basin & Swales Inspection and Maintenance Checklist Date of Inspection: Property Address: Treatment Measure No.: Page 5 Defect Conditions When Maintenance Is Needed Maintenance Needed? (Y/N)Comments (Describe maintenance completed and if any needed maintenance was not conducted, note when it will be done.) Results Expected When Maintenance Is Performed Tree/Brush Growth and Hazard Trees Growth does not allow maintenance access or interferes with maintenance activity. Dead, diseased, or dying trees/shrubs. Trees do not hinder maintenance activities. Remove hazard trees as approved by the City. (Use a certified Arborist to determine health of tree or removal requirements). Drainage time Standing water remains in basin more than five days. Correct any circumstances that restrict the flow of water from the system. Restore drainage to design condition. If the problem cannot be corrected and problems with standing water recur, then mosquitoes should be controlled with larvicides, applied by a licensed pesticide applicator. Outfall structure Debris or silt build-up obstructs an outfall structure. Remove debris and/or silt build-up and dispose of properly. Side Slopes Erosion Eroded over 2 in. deep where cause of damage is still present or where there is potential for continued erosion. Any erosion on a compacted berm embankment. Cause of erosion is managed appropriately. Side slopes or berm are restored to design specifications, as needed. Storage Area Sediment Accumulated sediment >10% of designed basin depth or affects inletting or outletting condition of the facility. Sediment cleaned out to designed basin shape and depth; basin reseeded if necessary to control erosion. Sediment disposed of properly. Liner (If Applicable) Liner is visible and has more than three 1/4-inch holes in it. Liner repaired or replaced. Liner is fully covered. Emergency Overflow / Spillway and Berms Settlement Berm settlement 4 inches lower than the design elevation. Dike is built back to the design elevation.
Basin & Swales Inspection and Maintenance Checklist Date of Inspection: Property Address: Treatment Measure No.: Page 6 Defect Conditions When Maintenance Is Needed Maintenance Needed? (Y/N)Comments (Describe maintenance completed and if any needed maintenance was not conducted, note when it will be done.) Results Expected When Maintenance Is Performed Tree Growth Tree growth on berms or emergency spillway >4 ft in height or covering more than 10% of spillway. Trees should be removed. If root system is small (base less than 4 inches) the root system may be left in place. Otherwise the roots should be removed and the berm restored. A civil engineer should be consulted for proper berm/spillway restoration. Emergency Overflow/ Spillway Rock is missing and soil is exposed at top of spillway or outside slope. Rocks and pad depth are restored to design standards. Debris Barriers (e.g., Trash Racks) Trash and Debris Trash or debris is plugging openings in the barrier. Trash or debris is removed and disposed of properly. Damaged/ Missing Bars Bars are missing, loose, bent out of shape, or deteriorating due to excessive rust. Bars are repaired or replaced to allow proper functioning of trash rack. Inlet/Outlet Pipe Debris barrier is missing or not attached to pipe. Debris barrier is repaired or replaced to allow proper functioning of trash rack. Fencing and Gates Missing or broken parts Any defect in or damage to the fence or gate that permits easy entry to a facility. Fencing and gate are restored to design specifications. Deteriorating Paint or Protective Coating Part or parts that have a rusting or scaling condition that has affected structural adequacy. Paint or protective coating is sufficient to protect structural adequacy of fence or gate. Flow Duration Control Outlet (if included in design to meet Hydromodification Management Standard) Risers, orifices and screens Any debris or clogging Restore unobstructed flow through discharge structure; to meet original design; dispose of debris properly. Drawdown time Noticeable ponding exceeding 72-hours after a design storm event Restore infiltration and ponded waters permeate. Scarification should only be performed when there are signs of clogging rather than on a routine basis. Always remove deposited sediments before scarification and use a hand-guided rotary tiller. Swales (in addition to general items listed above)
Basin & Swales Inspection and Maintenance Checklist Date of Inspection: Property Address: Treatment Measure No.: Page 7 Defect Conditions When Maintenance Is Needed Maintenance Needed? (Y/N)Comments (Describe maintenance completed and if any needed maintenance was not conducted, note when it will be done.) Results Expected When Maintenance Is Performed Impeded Flow Twice annually at beginning and end of wet season. After heavy runoff. Visible blockage or impediments. Trash and debris cleared from swale and disposed of properly especially prior to mowing. Landscaping or Vegetative Overgrowth Twice annually at beginning and end of wet season or as needed for aesthetics. Maintained flow and healthy vegetation. Miscellaneous Miscellaneous Any condition not covered above that needs attention to restore infiltration basin to design conditions. Meets the design specifications.
ATTACHMENT 3
City standard Single Sheet BMP (SSBMP) Exhibit
1. THESE BMPS ARE MANDATORY TO BE INSTALLED PER MANUFACTURER'S
RECOMMENDATIONS 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.
BMP NOTES:
PARTY RESPONSIBLE FOR MAINTENANCE:
NAME
ADDRESS
PHONE NO.
CONTACT
PLAN PREPARED BY:
NAME
ADDRESS
PHONE NO.
CERTIFICATION
COMPANY
5. REFER TO MAINTENANCE AGREEMENT DOCUMENT.
6. SEE PROJECT SWMP FOR ADDITIONAL INFORMATION.
SIGNATURE
JOHN DARLINGTON
4547 COVE DRIVE
CARLSBAD, CA 92008
(760) 803-5524
DAVID CARON
CIVIL LANDWORKS CORP.
110 COPPERWOOD WAY, SUITE P
OCEANSIDE, CA 92058
(760) 908-8745
110 COPPERWOOD WAY, SUITE P, OCEANSIDE, CA 92058
PH: 760-908-8745 ● info@civillandworks.com
BMP TYPEBMP ID #SYMBOL CASQA NO.DRAWING NO.SHEET NO.(S)MAINTENANCE
FREQUENCY
BMP MAINTENANCE TABLE
INSPECTION
FREQUENCYQUANTITY
TREATMENT CONTROL
**
BIOFILTRATION
AREA1 TC-32 SF.527-7A 2 SEMI-ANNUALLYQUARTERLY99
2
JOHN DARLINGTON
BMP SIGN 527-7A 2EA.2 SEMI-ANNUALLY ANNUALLY