HomeMy WebLinkAboutCD 2020-0022; THE BEACON PHASE 3; PRIORITY DEVELOPMENT PROJECT (PDP) PRELIMINARY STORM WATER QUALITY MANAGEMENT PLAN (SWQMP); 2022-03-16CITY OF CARLSBAD
PRIORITY DEVELOPMENT PROJECT (PDP) PRELIMINARY STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR BEACON PHASE III CD2020-0022 GR2021-0024, DWG 532-1A
ENGINEER OF WORK:
ROBERT J. DEPRAT, PE
RCE #60482
PREPARED FOR:
ASANA PARTNERS 10000 WASHINGTON BL, #07-105
CULVER CITY, CA 90232 (310)421-9176
PREPARED BY:
BLUE PEAK ENGINEERING, INC.
18543 YORBA LINDA BL, #235 YORBA LINDA, CA 92886 (714)749-3077
DATE:
3/16/2022
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: Categorization of Infiltration Feasibility Condition (when applicable) Attachment 1e: Pollutant Control BMP Design Worksheets / Calculations
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) ExhibitAttachment 5: Hydromodification Narrative
CERTIFICATION PAGE
Project Name: Beacon Phase III
Project ID: CD2020-0022, GR2021-0024, DWG 532-1A
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
Robert DePrat
Print Name
Blue Peak Engineering
Company
3/16/2022
Date
PROJECT VICINITY MAP
E-34 Page 1 of 4 REV 02/16
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: CDP2020-0022
ADDRESS: APN:
The project is (check one): New Development Redevelopment
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.
Beacon Phase III
7760-7770 El Camino Real
X
216-124-1600
The total proposed disturbed area is: ___12,577__ ft2 (________) acres
7,877
CD2017-0013 GR2018-0008
E-34 Page 2 of 4 REV 04/17
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;
b)Designed and constructed to be hydraulically disconnected from paved streets or roads;
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.
X
X
X
X
E-34 Page 3 of 4 REV 04/17
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.
X
X
X
X
X
X
X
X
X
X
X
E-34 Page 4 of 4 REV 04/17
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, check the first box stating “My project is a PDP …” and complete
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.
STEP 5
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.
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.
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:
* Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special 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
City Concurrence:
YES NO
By:
Date:
Project ID:
X
Robert DePrat President
2/15/2021
352,245
41,058
11.7
X
SITE INFORMATION CHECKLIST
Project Summary Information
Project Name Beacon Phase III
Project ID CD2020-0022
Project Address 7760 & 7770 El Camino Real
Assessor's Parcel Number(s) (APN(s)) 216-124-16
Project Watershed (Hydrologic Unit) Carlsbad 904
Parcel Area 8.69 Acres ( 378,536 Square Feet )
Existing Impervious Area
(subset of Parcel Area) 8.09 Acres ( 352,245 Square Feet )
Area to be disturbed by the project
(Project Area) 0.29 Acres ( 12,577 Square Feet )
Project Proposed Impervious Area
(subset of Project Area) 0.18 Acres ( 7,877 Square Feet)
Project Proposed Pervious Area
(subset of Project Area) 0.11 Acres ( 4,700 Square Feet)
Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area.
This Phase 3 Grading Plan is part of the larger Beacon Development, which is why the disturbedareas are much lower than the overall project area.
Description of Existing Site Condition and Drainage Patterns
Current Status of the Site (select all that apply):
X-Existing development
-Previously graded but not built out
-Agricultural or other non-impervious use
-Vacant, undeveloped/natural
Description / Additional Information: The existing site if a fully developed site with 2 buildings and the associated parking, drive aisles and landscaped
Existing Land Cover Includes (select all that apply):
X-Vegetative Cover
-Non-Vegetated Pervious Areas
X-Impervious Areas
Description / Additional Information: The existing site if a fully developed site with 2 buildings and the associated parking, drive aisles and landscaped
Underlying Soil belongs to Hydrologic Soil Group (select all that apply):
-NRCS Type A
-NRCS Type B
-NRCS Type C
X-NRCS Type D
Approximate Depth to Groundwater (GW):
-GW Depth < 5 feet
-5 feet < GW Depth < 10 feet
X-10 feet < GW Depth < 20 feet-GW Depth > 20 feet
Existing Natural Hydrologic Features (select all that apply):
-Watercourses
-Seeps
-Springs
-Wetlands
X-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]:
In the existing condition the property drains to the south from the southerly side of Building 7770 where it sheet flows down the drive aisle and out to El Camino Real via the existing driveway. The remaining site area drains to the north, then westward on the existing driveway and extending onto El Camino Real. There is no offsite runoff conveyed through the site.
Description of Proposed Site Development and Drainage Patterns
Project Description / Proposed Land Use and/or Activities: The project is proposing the beautification of the two existing buildings as well as removing the existing drive-thru for building 7760 and replacing with a patio area and landscaping. A new trash enclosure will be added and ADA upgrades are also included in the scope.
List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): The proposed impervious features consist of the new trash enclosure, patio areas and regraded paving for ADA access.
List/describe proposed pervious features of the project (e.g., landscape areas): The proposed pervious features include new landscape areas and a bio-swale
Does the project include grading and changes to site topography?
-YesX-No
Description / Additional Information: The existing site topography and drainage pattern will remain the same while adding more pervious area to the project.
Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? -Yes
X-No
Description / Additional Information: The existing site topography and drainage pattern will remain the same while adding more
pervious area to the project. A bio-swale is added for stormwater treatment.
Identify whether any of the following features, activities, and/or pollutant source areas will be
present (select all that apply):
X-On-site storm drain inlets
-Interior floor drains and elevator shaft sump pumps-Interior parking garages
-Need for future indoor & structural pest control
X-Landscape/Outdoor Pesticide Use
-Pools, spas, ponds, decorative fountains, and other water features
-Food service
X-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
X-Plazas, sidewalks, and parking lots
X-
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): Drainage enters into the existing storm drain in El Camino Real to Encinitas Creek / San Marcos Creek and then north to Batiquitos Lagoon, located in the northwest quadrant of the intersection
of El Camino Real and La Costa Avenue
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
San Marcos Creek DDE, Phosphorous, Sediment Toxicity
San Marcos Creek (Batiquitos Lagoon DDE, Phosphorous, Sediment 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
Nutrients X
Heavy Metals X
Organic Compounds X
Trash & Debris X
Oxygen Demanding Substances X
Oil & Grease X
Bacteria & Viruses X
Pesticides X
Hydromodification Management Requirements
Do hydromodification management requirements apply (see Section 1.6 of the BMP Design
Manual)?
x-Yes, hydromodification management flow control structural BMPs required.
-No, the project will discharge runoff directly to existing underground storm drains dischargingdirectly 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
x-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: The site contains a preponderance of soils with USDA-NRCS erosion factor kf less than 0.4 (kf=0.28), so protection is not required
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.
POC1 – BMP1 on north end of project
Has a geomorphic assessment been performed for the receiving channel(s)?
X-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.
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
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:
GR2021-0024 / DWG532-1A
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:
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.
The bulk of the work on this project is the removal of the existing drive-thru for Building 7760 and the improvements to the patio and sidewalk areas surrounding the existing buildings. The site soils are not conducive to infiltration (0.01 - 0.06 in/hr measured per Geotechnical
Evaluation of The Beacon Project by Ninyo & Moore dated 9/1/17, proj. 108375001). Reuse was also determined to be infeasible. As such bio-filtration treatment BMPs were utilized to meet water quality goals for the site. Said BMPs area also evaluated for attenuation of peak
flows to manage hydromodification goals.
Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP]
Structural BMP ID No. BMP1
DWG 532-1A Sheet No. 3 of 4
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)
X-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
X-Combined pollutant control and hydromodification control
Pre-treatment/forebay for another structural BMP
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)
X-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.
X-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.
X-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
X-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)
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) X-Included
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.
X-Exhibit showing project drainage boundaries marked on
WMAA Critical Coarse Sediment Yield Area Map (Required)
Optional analyses for Critical Coarse Sediment Yield Area Determination
6.2.1 Verification of Geomorphic Landscape Units Onsite
6.2.2 Downstream Systems Sensitivity to Coarse Sediment
6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite
Attachment 2c Geomorphic Assessment of Receiving
Channels (Optional)
See Section 6.3.4 of the BMP Design
Manual.
X-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
To be deferred to final grading plan
check
22
11
88
1616
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2525
2727
2323
2222
99
55
1212
1515
1414
33
2424
66
2626
1313
2121
2020
77
1717
1818 1919
1111
RedMountainReservoir
LAKEHENSHAWTURNERLAKE
LAKEWOHLFORD
BUENAVISTALAGOON DIXONRESERVOIR
AQUAHEDIONDALAGOON SAN MARCOSLAKE SUTHERLANDRESERVOIRBATIQUITOSLAGOON
SANDIEGUITORESERVOIR RESERVOIR
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SAN ELIJOLAGOON
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SAN VICENTERESERVOIR
MIRAMARRESERVOIR SANTEERECREATIONALLAKES
MISSIONBAY
LOVELANDRESERVOIRLAKEMURRAYMOUNTHELIXLAKE
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CHOLLASHEIGHTSRESERVOIR HANSENRESERVOIR
MORENARESERVOIRSWEETWATERRESERVOIRBARRETTLAKE
LOWER OTAYRESERVOIOR
LOSPENASQUITOSLAGOON
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SANDIEGUITOLAGOON
LAKEHODGES
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CARLSBADCARLSBAD
CHULACHULAVISTAVISTA
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LA MESALA MESA
NATIONALNATIONALCITYCITY
OCEANSIDEOCEANSIDE
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S.D.S.D.COUNTYCOUNTY
S.D.S.D.COUNTYCOUNTY
SANSANDIEGODIEGO
SANSANMARCOSMARCOS
SANTEESANTEE
VISTAVISTA
San D iegoR iv erChollasC reekSanDiegu itoRiverSanMarcosCreek
Rattles n ak eCreekDulzuraCreekSanMarcosCreek
E scondidoCreekTijuanaR i ver JamulCr e ekSycamoreCreek
C o ttonwood CreekB u ena V is taCre e k
Poway Cr ee k
O tay R i v er
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cinita s Cree kWoodglenVistaCreekA gua Hedionda Cre ekSantaMargaritaRiverSweetwa terRiverRoseC reek Sa n L u isR e yRive
rO tayR i v erSanta Ysa be lC ree kPotential Critical Coarse Sediment Yield Areas
Exhibit Date: Sept. 8, 2014Regional San Diego County Watersheds
Aerial Imagery Source: DigitalGlobe, 06/2012
Legend
Regional WMAA Streams
Watershed Boundaries
Municipal Boundaries
Rivers & Streams
Potential Critical Coarse Sediment Yield Areas
NORTH
0 5 10 15Miles
REACH ID NAME
1 Santa Margarita River
2 San Luis Rey River
3 Buena Vista Creek
4 Agua Hedionda Creek
5 San Marcos Creek
6 Encinitas Creek
7 Cottonwood Creek (Carlsbad WMA)
8 Escondido Creek
9 San Dieguito Creek - Reach 1
10 San Dieguito Creek - Reach 2
11 Lusardi Creek
12 Los Penasquitos / Poway Creek
13 Rattlesnake Creek
14 Carroll Canyon Creek
15 Rose Creek
16 San Diego River
17 Sycamore Creek
18 Woodglen Vista Creek
19 San Vicente Creek
20 Forester Creek
21 Chollas Creek
22 Sweetwater River - Reach 1
23 Sweetwater River - Reach 2
24 Otay River
25 Jamul / Dulzura Creek
26 Tijuana River
27 Cottonwood Creek (Tijuana WMA)
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EESSTTRREELLLLAADDEEMMAARRRRDDDocument Path: J:\RequestsMarch2015\ComEconDev\LandDevEng\0004727_15\PCCSYA_ArchE.mxdDate: 06/03/2015
Legend
Potential Critical Coarse Sediment Yield Area
WMAA Potential CriticalCoarse Sediment Yield Areas
0 1,000 2,000 3,000500FeetI
SOURCE: San Diego County Regional Watershed Management Area Analysis," September 8, 2014,prepared by Geosyntec Consultants and Rick Engineering Company
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 3 Structural BMP Maintenance Information
Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment:
To be deferred to final grading plan check
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
Chapter 7: Long Term Operation and Maintenance
TABLE 7-3. Maintenance Indicators and Actions for Vegetated BMPs
Typical Maintenance Indicator(s) Maintenance Actions for Vegetated BMPs
Accumulation of sediment, litter, or Remove and properly dispose of accumulated materials, without
debris damage to the vegetation.
Poor vegetation establishment Re-seed, re-plant, or re-establish vegetation per original plans.
Overgrown vegetation Mow or trim as appropriate, but not less than the design height of
the vegetation per original plans when applicable (e.g. a vegetated
swale may require a minimwn vegetation height).
Erosion due to concentrated irrigation Repair/ re-seed/ re-plant eroded areas and adjust the irrigation
flow system.
Erosion due to concentrated storm Repair/ re-seed/ re-plant eroded areas, and make appropriate
water runoff flow corrective measures such as adding erosion control blankets,
adding stone at flow entry points, or minor re-grading to restore
proper drainage according to the original plan. If the issue is not
corrected by restoring the BMP to the original plan and grade,
The County must be contacted prior to any additional repairs or
reconstruction.
Standing water in vegetated swales Make appropriate corrective measures such as adjusting irrigation
system, removing obstructions of debris or invasive vegetation,
loosening or replacing top soil to allow for better infiltration, or
minor re-grading for proper drainage. If the issue is not corrected
by restoring the BMP to the original plan and grade, County staff
in the \Xlatershed Protection Program must be contacted prior to
any additional repairs or reconstruction.
Standing water in bioretention, Make appropriate corrective measures such as adjusting irrigation
biofiltration with partial retention, or system, removing obstructions of debris or invasive vegetation,
biofiltration areas, or flow-through clearing underdrains (where applicable), or repairing/replacing
planter boxes for longer than 96 hours clogged or compacted soils.
following a storm even~
Obstructed inlet or outlet structure Clear obstructions.
Damage to structural components such Repair or replace as applicable.
as weirs, inlet or outlet structures
*These BMPs typically include a surface ponding layer as part of their function which may take 96 hours to
drain following a storm event.
7-14 Effective February 26, 2016
ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit
Appendix I:
Forms and Checklists
Harvest and Use Feasibility Checklist Form I-7
1. Is there a demand for harvested water (check all that apply) at the project site that is reliably present during
the wet season?
Toilet and urinal flushing
Landscape irrigation
Other:______________
2.If there is a demand; estimate the anticipated average wet season demand over a period of 36 hours.
Guidance for planning level demand calculations for toilet/urinal flushing and landscape irrigation is provided
in Section B.3.2.
147 gallons of landscape demand and 140 gallons of toilet demand = 33 cubic feet
3.Calculate the DCV using worksheet B-2.1.
DCV = _____253_____ (cubic feet)
3a. Is the 36 hour demand greater than or
equal to the DCV?
Yes / No
3b. Is the 36 hour demand greater than
0.25DCV but less than the full DCV?
Yes / No
3c. Is the 36 hour
demand less than
0.25DCV?
Yes
Harvest and use appears to be feasible.
Conduct more detailed evaluation and
sizing calculations to confirm that DCV
can be used at an adequate rate to meet
drawdown criteria.
Harvest and use may be feasible. Conduct
more detailed evaluation and sizing
calculations to determine feasibility.
Harvest and use may only be able to be
used for a portion of the site, or
(optionally) the storage may need to be
upsized to meet long term capture targets
while draining in longer than 36 hours.
Harvest and use is
considered to be
infeasible.
Is harvest and use feasible based on further evaluation?
Yes, refer to Appendix E to select and size harvest and use BMPs.
No, select alternate BMPs.
X
X
X X
X
Appendix I: Forms and Checklists
r --,:,.~-•
Categorization of Infiltration Fcasiliility Condition Form I-S
Part t -Full Infiltration Feasibility Screening Criteria
Would infiltration of the full design volume be feasible from a physical perspective without any undesirable
consequences that cannot be reasonably mitigated?
Criteria Screening Question
Is the estimated reliable infiltration rate below proposed facility
locations greater than 0.5 inches per hour? The response to this
Screening Question must be based on a comprehensive evaluation of
the factors presented in r\ppendix C.2 and Appendix D.
Provide basis:
Yes No
X
Infiltration rate for native soil is <0.01 in/hr per geotechnical report dated September 1st, 2017 by Ninyo & Moore.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/data source applicability.
2
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of geotechnical hazards (slope stability,
groundwater mounding, utilities, or other factors) that cannot be
mitigated to an acceptable level? The response to this Screening
Question must be based on a comprehensive evaluation o f the factors
presented in Appendix C.2.
Provide basis:
X
Infiltration rate for native soil is <0.01 in/hr per geotechnical report dated September 1st, 2017 by Ninyo & Moore.
Summarize findings of studies; provide reference to snidies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
1-3 February 26, 2016
Appendix I: Forms and Checklists
Criteria
3
Form 1-8 Page 2 of 4
Screening Question
Can infiltration greater than 0.5 inches per hour be allowed
without increasing risk of groundwater contamination (shallow
water table, storm water pollutants or other factors) that cannot
be mitigated to an acceptable level? l11e response to this Screening
Question must be based on a comprehensive evaluation of the factors
presented in Appendix C.3.
Provide basis:
Yes
Groundwater encountered at depth of 13 ft bgs, bit seepage at 3.5 ft bgs per geotechnical report
dated September 1st, 2017 by Ninyo & Moore.
No
X
Swmnarizc findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/data source applicability.
4
Can infiltration greater than 0.5 inches per hour be allowed
without causing potential water balance issues such as change of
seasonality of ephemeral streams or increased discharge of
contaminated groundwater to surface waters? The response to th.is
Screening Quest.ion must be based on a comprehensive evaluation of
the factors presented in Appendi:..:: C.3.
Provide basis:
X
Infiltration rate for native soil is <0.01 in/hr per geotechnical report dated September 1st, 2017 by Ninyo & Moore.
Swnmarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability.
Part 1
Result
*
Jf all answers to rows 1 -4 are ''Yes" a full infiltration design is potentially feasible. The
feasibility screening category is Full Infiltration
If any answer from row 1-4 is "No", infiltration may be possible tO some extent but
would not generally be feasible or desirable to achieve a "full infiltration" design.
Proceed to Part 2
No
-tTo be completed using gathered site information and best professional judgment cons1dcr1ng the definition of ~fEP 1J1
the MS4 Permit. .Additional testing and/or studies may be required by .-\gency/J urisdict.ions to substantiate findings
1-4 February 26, 2016
Appendix I: Forms and Checklists
Part 2 Partial Infiltration vs. No Infilttation Feasibility Screening Criteria
Would infiltration of water in any appreciable amount be physically feasible without any negative
consequences that cannot be reasonably mitigated?
Criteria
5
Screening Question
Do soil and geologic conditions allow for infiltration in any
appreciable rate or volume? The response to this Screening
Question must be based on a comprehensive evaluation of the factors
presented in Appendix C.2 and Appendix D.
Provide basis:
Native soil is sandy siltstone that does not allow infiltration.
Yes No
X
Infiltration rate for native soil is <0.01 in/hr per geotechnical report dated September 1st, 2017 by Ninyo & Moore.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
6
Can Infiltration in any appreciable quantity be allowed without
increasing risk of geotechnical hazards (slope stability,
groundwater mounding, utilities, or other factors) that cannot
be mitigated to an acceptable level? The response to this Screening
Question must be based on a comprehensive evaluation o f the factors
presented in Appendix C.2.
Provide basis:
Due to sleep natural grade, infiltration could cause slope stability concerns.
The majority of the site is fill on sloped site.
Infiltration not recommended adj. to structures or slopes.
Infiltration devices will result in lateral migration of subsurface water that could potentially lead to adverse
effects to structures and site improvements per geotechnical report.
dated September 1st, 2017 by Ninyo & Moore.
X
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/ data source applicability and why it was not feasible to mitigate low infiltration rates.
1-5 February 26, 2016
Criteria
7
Appendix I: Forms and Checklists
Form 1-8 Page 4 of 4
Screening Question
Can Infiltration in any appreciable quantity be allowed without
posing significant risk for groundwater related concerns
(shallow water table, storm water pollutants or other factors)?
The response to this Screening Question must be based on a
comprehensive evaluation of the factors presented in 1\ppendix C.3.
Yes No
X
Provide basis:
Seepage was observed onsite and there is a possibility of perched water conditions due to the presence of
trench backfill and bedding. Due to these concerns, infiltration will pose a significant risk.
Summarize findings of sn,dies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates.
8
Can infiltration be allowed without violating downstream water
rights? The response to this Screening Q uestion must be based on a
comprehensive evaluation of the factors presented in Appendix C.3.
N/A
X
Providebasis: Not analyzed because infiltration found infeasible and
not recommended by geotechnical engineer.
Summarize findings of studies; provide reference to studies, calculations, maps, data sources, etc. Provide narrative
discussion of study/data source applicability and why it was not feasible to mitigate low infiltration rates.
Part 2
Result*
If all answers from row 1-4 are yes then partial infiltration design is potentially feasible.
"Die feasibility screening category is Partial Infiltration. NO
Tf any answer from row 5-8 is no, then infiltration of any volume is considered to be INF I LRA TI )N
infeasible within the drainage area. The feasibility screening category is No Infiltration.
:.-refo be completed ustng gathered stte mformation and best professional Judgment constdeang the definition of ~fEP u1
the }.!S4 Permit. Additional testing and/or studies may be required by Agency/Jurisdictions to substantiate findings
1-6 February 26, 2016
Appendix B:
Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Worksheet B.2-1. DCV
Design Capture Volume Worksheet B-2.1
1 85th percentile 24-hr storm depth from Figure B.1-1 d= inches
2 Area tributary to BMP (s) A= acres
3 Area weighted runoff factor (estimate using Appendix B.1.1
and B.2.1) C= unitless
4 Street trees volume reduction TCV= cubic-feet
5 Rain barrels volume reduction RCV= cubic-feet
6 Calculate DCV =(3630 x C x d x A) – TCV - RCV DCV= cubic-feet
0.600.54
0.18
0.90
0
0
352
DMA-1
Project Name:Beacon Phase 3
Project Applicant:Blue Peak Engineering
Jurisdiction:Carlsbad
Parcel (APN):216‐124‐16
Hydrologic Unit:Carlsbad 904
Rain Gauge:Oceanside
Total Project Area (sf):12,631
Channel Susceptibility: High
BMP Sizing Spreadsheet V3.1
Project Name: Hydrologic Unit:Project Applicant: Rain Gauge:Jurisdiction: Total Project Area:Parcel (APN): Low Flow Threshold:BMP Name: BMP Type:BMP Native Soil Type:BMP Infiltration Rate (in/hr):HMP Sizing Factors Minimum BMP SizeDMA NameArea (sf)Pre Project Soil TypePre‐Project SlopePost Project Surface TypeArea Weighted Runoff Factor(Table G.2‐1)1Surface Area Surface Area (SF)imp paving 7,877 D Flat Concrete 1.00.07 551permeable 1,100 D Flat Landscape 0.10.07 800000000000000000000000000BMP Tributary Area 8,977Minimum BMP Size 559Proposed BMP Size*614* Assumes standard configuration 12.00 in18.00 in6.00 in12 in3.0 in3.5Notes:1. Runoff factors which are used for hydromodification management flow control (Table G.2‐1) are different from the runoff factors used for pollutant control BMP sizing (Table B.1‐1). Table references are taken from the San Diego Region Model BMP Design ManuThis BMP Sizing Spreadsheet has been updated in conformance with the San Diego Region Model BMP Design Manual, May 2018. For questions or concerns please contact the jurisdiction in which your project is located.Describe the BMP's in sufficient detail in your PDP SWQMP to demonstrate the area, volume, and other criteria can be met within the constraints of the site.BMP's must be adapted and applied to the conditions specific to the development project such as unstable slopes or the lack of available head. Designated Staff have final review and approval authority over the project design.Underdrain OffsetBioretention Soil Media DepthFilter CoarseGravel Storage Layer DepthSurface Ponding DepthAreas Draining to BMPCarlsbad216‐124‐16DBMP Sizing Spreadsheet V3.10.025Biofiltration0.1Q212,631OceansideCarlsbad 904DMA‐1Beacon Phase 3Blue Peak Engineering
Project Name: Hydrologic Unit:Project Applicant: Rain Gauge:Jurisdiction: Total Project Area:Parcel (APN): Low Flow Threshold:BMP Name BMP Type:Rain Gauge Unit Runoff Ratio DMA Area (ac)Orifice Flow ‐ %Q2Orifice AreaSoil Type Slope (cfs/ac) (cfs) (in2)imp paving Oceanside D Flat 0.571 0.181 0.0100.15permeable Oceanside D Flat 0.571 0.025 0.0010.023.750.012 0.17 0.46Max Orifice HeadMax Tot. Allowable Orifice FlowMax Tot. AllowableOrifice AreaMax Orifice Diameter(feet)(cfs)(in2)(in)0.013 0.014 0.200.500Average outflow during surface drawdownMax Orifice Outflow Actual Orifice AreaSelected Orifice Diameter(cfs) (cfs)(in2)(in)Drawdown (Hrs) 13.3DMA‐1Pre‐developed ConditionNo Orifice Required for Infiltration FacilitiesDMA NameCarlsbad 904BMP Sizing Spreadsheet V3.1Carlsbad216‐124‐16Beacon Phase 3Blue Peak Engineering0.1Q212,631OceansideBiofiltrationDrawdown time exceeds 96 Hrs. Project must implement a vector control program.
Appendix B:
Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Worksheet B.5-1: Simple Sizing Method for Biofiltration BMPs
Simple Sizing Method for Biofiltration BMPs Worksheet B.5-1
1 Remaining DCV after implementing retention BMPs cubic-feet
Partial Retention
2 Infiltration rate from Worksheet D.5-1 if partial infiltration is feasible in/hr.
3 Allowable drawdown time for aggregate storage below the underdrain 36 hours
4 Depth of runoff that can be infiltrated [Line 2 x Line 3] inches
5 Aggregate pore space 0.40 in/in
6 Required depth of gravel below the underdrain [Line 4/ Line 5] inches
7 Assumed surface area of the biofiltration BMP sq-ft
8 Media retained pore storage 0.1 in/in
9 Volume retained by BMP [[Line 4 + (Line 12 x Line 8)]/12] x Line 7 cubic-feet
10 DCV that requires biofiltration [Line 1 – Line 9] cubic-feet
BMP Parameters
11 Surface Ponding [6 inch minimum, 12 inch maximum] inches
12 Media Thickness [18 inches minimum], also add mulch layer thickness
to this line for sizing calculations inches
13
Aggregate Storage above underdrain invert (12 inches typical) – use 0
inches for sizing if the aggregate is not over the entire bottom surface
area
1inches
14 Media available pore space 0.2 in/in
15
Media filtration rate to be used for sizing (5 in/hr. with no outlet
control; if the filtration rate is controlled by the outlet use the outlet
controlled rate)
5 in/hr.
Baseline Calculations
16 Allowable Routing Time for sizing 6 hours
17 Depth filtered during storm [ Line 15 x Line 16] 30 inches
18 Depth of Detention Storage
[Line 11 + (Line 12 x Line 14) + (Line 13 x Line 5)] inches
19 Total Depth Treated [Line 17 + Line 18] inches
352
N/A
N/A
N/A
145
22
330
12
18
12
20.4
50.4
DMA-1
Appendix B:
Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods
Worksheet B.5 1: Simple Sizing Method for Biofiltration BMPs
Simple Sizing Method for Biofiltration BMPs Worksheet B.5-1 (Page 2 of 2)
Option 1 – Biofilter 1.5 times the DCV
20 Required biofiltered volume [1.5 x Line 10] cubic-feet
21 Required Footprint [Line 20/ Line 19] x 12 sq-ft
Option 2 - Store 0.75 of remaining DCV in pores and ponding
22 Required Storage (surface + pores) Volume [0.75 x Line 10] cubic-feet
23 Required Footprint [Line 22/ Line 18] x 12 sq-ft
Footprint of the BMP
24 Area draining to the BMP sq-ft
25 Adjusted Runoff Factor for drainage area (Refer to Appendix B.1 and
B.2)
26 Minimum BMP Footprint [Line 24 x Line 25 x 0.03] sq-ft
25 Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line
26) sq-ft
26 BMP Footprint Sizing Factor (Default 0.03 or an alternative minimum
footprint sizing factor from Worksheet B.5-2, Line 11) unitless
27 Minimum BMP Footprint [Line 24 x Line 25 x Line 26] sq-ft
28 Footprint of the BMP = Maximum(Minimum(Line 21, Line 23), Line 27) sq-ft
Check for Volume Reduction [Not applicable for No Infiltration Condition]
29 Calculate the fraction of the DCV retained by the BMP [Line 9/ Line 1] unitless
30 Minimum required fraction of DCV retained for partial infiltration
condition
0
.375 unitless
31 Is the retained DCV > 0.375? If the answer is no increase the footprint
sizing factor in Line 26 until the answer is yes for this criterion. ☐Yes ☐No
Note:
1.Line 7 is used to estimate the amount of volume retained by the BMP. Update assumed surface area in
Line 7 until its equivalent to the required biofiltration footprint (either Line 21 or Line 23)
2.The DCV fraction of 0.375 is based on a 40% average annual percent capture and a 36-hour drawdown
time.
3.The increase in footprint for volume reduction can be optimized using the approach presented in
Appendix B.5.2. The optimized footprint cannot be smaller than the alternative minimum footprint
sizing factor from Worksheet B.5-2.
4.If the proposed biofiltration BMP footprint is smaller than the alternative minimum footprint sizing
factor from Worksheet B.5-2, but satisfies Option 1 or Option 2 sizing, it is considered a compact
biofiltration BMP and may be allowed at the discretion of the [City Engineer], if it meets the
requirements in Appendix F.
495
118
248
145
7,877
0.90
212
212
0.03
212
212
1.0
x
ATTACHMENT 5
Hydromodification Narrative
The site is located at the southeast corner of El Camino Real and La Costa Avenue. The
site is located across the street from Encinitas Creek, which drains to Batiquitos Lagoon, located in the northwest quadrant of said intersection,
The site lies within the HU 904.4 Encinitas Hydrologic Unit, 12-180703030503 and is subject to hydromodification requirements as required by the City's BMP Manual for priority projects draining to non-improved channels.
Overall, the site will meet existing hydrologic flow rates per the City's BMP Manual. Per the BMP Manual, for flow rates ranging from 10 percent, 30 percent or 50 percent of the pre-development 2- year runoff event (0.10 2, 0.30 2, or 0.50 2) to the pre-development 10-year runoff event (0 10), the post-project discharge rates and durations shall not deviate above the pre-development rates and durations by more than 10 percent over and more than 10 percent over.
Per Appendix G.1.6: Guidance for Continuous Simulation and Hydromodification Management Sizing Factors, of the City's BMP Manual:
1. For flow rates ranging from 10 percent, 30 percent or 50 percent of the pre- development 2-year runoff event (0.1Q2, 0.3Q2, or 0.5Q2) to the pre-development 10-
year runoff event (Q10), the post-project discharge rates and durations shall not deviate above the pre-development rates and durations by more than 10 percent over and more than 10 percent of the length of the flow duration curve. The specific lower flow threshold
will depend on the erosion susceptibility of the receiving stream for the project site [O.1Q2 assumed, worst case per Manual 2. For flow rates ranging from the lower flow threshold to Q5, the post-project peak flows shall not exceed pre-development peak flows. For flow rates from Q5 to Q10, post-project peak flows may exceed pre-development flows by up to 10 percent.
The proposed project will maintain the existing drainage pattern which surface flows from the existing buildings, drive aisles and parking areas out onto El Camino Real and into the public storm drain system located in the public right-of-way.
The proposed project will provide a reduction of the impervious area of the site by replacing existing impervious surfaces with landscaping and pervious paving, thereby decreasing the runoff coefficient, C, included in the rational method equation. The Preliminary Grading Plan included in this submittal provides additional details as to the quantities of impervious and pervious surfaces as well as the project drainage patterns.
The rational method is commonly used for determining peak discharge from
relatively small drainage areas. The rational method is based on the following equation:
Q = C I A Where:
Q = peak discharge, in cubic feet per second (cfs)
C = runoff coefficient, proportion (impervious surface vs. pervious surface) of the
rainfall that runs off the surface (no units)
I = average rainfall intensity (in/hr)
A = Drainage Area (acres)
Since the rainfall intensity, I, and the drainage area, A, in the rational method equation remain the same for the pre- and post-development and the runoff coefficient, C, is decreased by reducing the project impervious surface area, the
peak discharge, Q, from the proposed project will be less than that of the existing condition.
Lower Flow Threshold Soil Group Slope Rain Gauge A0.1Q2A Flat Lindbergh 0.0550.1Q2A Moderate Lindbergh 0.0550.1Q2A Steep Lindbergh 0.0550.1Q2B Flat Lindbergh 0.0450.1Q2B Moderate Lindbergh 0.0450.1Q2B Steep Lindbergh 0.0450.1Q2C Flat Lindbergh 0.0350.1Q2C Moderate Lindbergh 0.0350.1Q2C Steep Lindbergh 0.0350.1Q2D Flat Lindbergh 0.030.1Q2D Moderate Lindbergh 0.030.1Q2D Steep Lindbergh 0.030.1Q2A Flat Oceanside 0.060.1Q2A Moderate Oceanside 0.060.1Q2A Steep Oceanside 0.060.1Q2B Flat Oceanside 0.050.1Q2B Moderate Oceanside 0.050.1Q2B Steep Oceanside 0.050.1Q2C Flat Oceanside 0.050.1Q2C Moderate Oceanside 0.050.1Q2C Steep Oceanside 0.0450.1Q2D Flat Oceanside 0.0350.1Q2D Moderate Oceanside 0.0350.1Q2D Steep Oceanside 0.0350.1Q2A Flat Lake Wohlford 0.0850.1Q2A Moderate Lake Wohlford 0.0850.1Q2A Steep Lake Wohlford 0.0850.1Q2B Flat Lake Wohlford 0.07Table G.2-3: Sizing Factors for Hydromodification Flow Control Infiltration BMPs Designed Using Sizing Factor Method
0.1Q2B Moderate Lake Wohlford 0.070.1Q2B Steep Lake Wohlford 0.070.1Q2C Flat Lake Wohlford 0.0550.1Q2C Moderate Lake Wohlford 0.0550.1Q2C Steep Lake Wohlford 0.0550.1Q2D Flat Lake Wohlford 0.040.1Q2D Moderate Lake Wohlford 0.040.1Q2D Steep Lake Wohlford 0.04Lower Flow Threshold Soil Group Slopebelow low orifice inveRain Gauge A0.1Q2A Flat 18 Lindbergh 0.080.1Q2A Moderate 18 Lindbergh 0.080.1Q2A Steep 18 Lindbergh 0.080.1Q2B Flat 18 Lindbergh 0.0650.1Q2B Moderate 18 Lindbergh 0.0650.1Q2B Steep 18 Lindbergh 0.060.1Q2C Flat 6 Lindbergh 0.050.1Q2C Moderate 6 Lindbergh 0.050.1Q2C Steep 6 Lindbergh 0.050.1Q2D Flat 3 Lindbergh 0.050.1Q2D Moderate 3 Lindbergh 0.050.1Q2D Steep 3 Lindbergh 0.050.1Q2A Flat 18 Oceanside 0.080.1Q2A Moderate 18 Oceanside 0.0750.1Q2A Steep 18 Oceanside 0.0750.1Q2B Flat 18 Oceanside 0.070.1Q2B Moderate 18 Oceanside 0.070.1Q2B Steep 18 Oceanside 0.070.1Q2C Flat 6 Oceanside 0.070.1Q2C Moderate 6 Oceanside 0.07Table G.2-4: Sizing Factors for Hydromodification Flow Control Biofiltration with Partial Retention Designed Using Sizing Factor Method
0.1Q2C Steep 6 Oceanside 0.070.1Q2D Flat 3 Oceanside 0.070.1Q2D Moderate 3 Oceanside 0.070.1Q2D Steep 3 Oceanside 0.070.1Q2A Flat 18 Lake Wohlford 0.110.1Q2A Moderate 18 Lake Wohlford 0.110.1Q2A Steep 18 Lake Wohlford 0.1050.1Q2B Flat 18 Lake Wohlford 0.090.1Q2B Moderate 18 Lake Wohlford 0.0850.1Q2B Steep 18 Lake Wohlford 0.0850.1Q2C Flat 6 Lake Wohlford 0.0650.1Q2C Moderate 6 Lake Wohlford 0.0650.1Q2C Steep 6 Lake Wohlford 0.0650.1Q2D Flat 3 Lake Wohlford 0.060.1Q2D Moderate 3 Lake Wohlford 0.060.1Q2D Steep 3 Lake Wohlford 0.06Lower Flow Threshold Soil Group Slope Rain Gauge A0.1Q2A Flat Lindbergh 0.320.1Q2A Moderate Lindbergh 0.30.1Q2A Steep Lindbergh 0.2850.1Q2B Flat Lindbergh 0.1050.1Q2B Moderate Lindbergh 0.10.1Q2B Steep Lindbergh 0.0950.1Q2C Flat Lindbergh 0.0550.1Q2C Moderate Lindbergh 0.050.1Q2C Steep Lindbergh 0.050.1Q2D Flat Lindbergh 0.050.1Q2D Moderate Lindbergh 0.050.1Q2D Steep Lindbergh 0.050.1Q2A Flat Oceanside 0.150.1Q2A Moderate Oceanside 0.140.1Q2A Steep Oceanside 0.135Table G.2-5: Sizing Factors for Hydromodification Flow Control Biofiltration BMPs Designed Using Sizing Factor Method
0.1Q2B Flat Oceanside 0.0850.1Q2B Moderate Oceanside 0.0850.1Q2B Steep Oceanside 0.0850.1Q2C Flat Oceanside 0.0750.1Q2C Moderate Oceanside 0.0750.1Q2C Steep Oceanside 0.0750.1Q2D Flat Oceanside 0.070.1Q2D Moderate Oceanside 0.070.1Q2D Steep Oceanside 0.070.1Q2A Flat Lake Wohlford 0.2850.1Q2A Moderate Lake Wohlford 0.2750.1Q2A Steep Lake Wohlford 0.270.1Q2B Flat Lake Wohlford 0.150.1Q2B Moderate Lake Wohlford 0.1450.1Q2B Steep Lake Wohlford 0.1450.1Q2C Flat Lake Wohlford 0.070.1Q2C Moderate Lake Wohlford 0.070.1Q2C Steep Lake Wohlford 0.070.1Q2D Flat Lake Wohlford 0.060.1Q2D Moderate Lake Wohlford 0.060.1Q2D Steep Lake Wohlford 0.06Lower Flow Threshold Soil Group Slope Rain Gauge V0.1Q2A Flat Lindbergh 0.540.1Q2A Moderate Lindbergh 0.510.1Q2A Steep Lindbergh 0.490.1Q2B Flat Lindbergh 0.190.1Q2B Moderate Lindbergh 0.180.1Q2B Steep Lindbergh 0.180.1Q2C Flat Lindbergh 0.110.1Q2C Moderate Lindbergh 0.110.1Q2C Steep Lindbergh 0.110.1Q2D Flat Lindbergh 0.09Table G.2-6: Sizing Factors for Hydromodification Flow Control Cistern Facilities Designed Using Sizing Factor Method
0.1Q2D Moderate Lindbergh 0.090.1Q2D Steep Lindbergh 0.090.1Q2A Flat Oceanside 0.260.1Q2A Moderate Oceanside 0.250.1Q2A Steep Oceanside 0.250.1Q2B Flat Oceanside 0.160.1Q2B Moderate Oceanside 0.160.1Q2B Steep Oceanside 0.160.1Q2C Flat Oceanside 0.140.1Q2C Moderate Oceanside 0.140.1Q2C Steep Oceanside 0.140.1Q2D Flat Oceanside 0.120.1Q2D Moderate Oceanside 0.120.1Q2D Steep Oceanside 0.120.1Q2A Flat Lake Wohlford 0.530.1Q2A Moderate Lake Wohlford 0.490.1Q2A Steep Lake Wohlford 0.490.1Q2B Flat Lake Wohlford 0.280.1Q2B Moderate Lake Wohlford 0.280.1Q2B Steep Lake Wohlford 0.280.1Q2C Flat Lake Wohlford 0.140.1Q2C Moderate Lake Wohlford 0.140.1Q2C Steep Lake Wohlford 0.140.1Q2D Flat Lake Wohlford 0.120.1Q2D Moderate Lake Wohlford 0.120.1Q2D Steep Lake Wohlford 0.12