HomeMy WebLinkAboutCDP 13-30; DE ANDA RESIDENCE; SWMP; DWG 482-7, DWG 482-7A; 2014-07-300
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SWMP 14-07
(CDP 13-30/CDP 13-31)
CITY OF CARLSBAD
ENGINEERING DIVISION
PRIORITY DEVELOPMENT PROJECT
STORM WATER MANAGEMENT PLAN
FOR
DE ANDA RESIDENCE
ENGINEER OF WORK
r!_jd/_ r VINCENT L. SAMPO -RCE 44173
PREPARED FOR:
VERONICA DE ANDA
1409 TURQUOISE DR
CARLSBAD, CA 92011
PREPARED BY:
SAMPO ENGINEERING, INC.
1034 SECOND STREET
ENCINITAS, CA 92024
760-436-0660
De Anda Residence Sampo Engineering, Inc.
CDP 13-30/13-31 7/30/2014
Priority Development Storm Water Management Plan 1
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TABLE OF CONTENTS
1. Project Setting
2. Applicable Storm Water Standards
3. Identify Pollutants of Concern
4. Source Control Measures
5. Low Impact Development (LID) Design Strategies
6. Integrated Management Practices (IMP's)
7. Documentation of Storm Water Design
8. BMP Facility Maintenance Requirements
9. SWMP Certification Statements
Attachments:
Vicinity Map
Hydrology and Hydraulic Calculations
Project Threat Assessment Form E-32
Construction Threat Assessment Form E-33
Storm Water Standards Questionnaire (SWSQ) E-34
Post-Construction BMP Exhibit
Orthophoto Maps for Hydrology Study
Storm Drain Improvement Plan
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
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1.0 Project Setting
The subject property is located on the westerly side of Jefferson Street, just south of the
intersection of Las Flores Drive, in Carlsbad, California and is approximately 0.37 acres
in size. The property is legally described as a portion of Tract No. 3 of Laguna Mesa
Tracts, according to Map No. 1719 (APN: 155-140-41) and is bounded on the west by the
Buena Vista Lagoon, to the east by Jefferson Street, and to the north and south by single
family developments.
The subject property is currently vacant; however there is evidence that a structure
occupied the property in the past, and has been previously graded. From the easterly
boundary of the project, also being Jefferson Street, there is a 55-80' wide pad area, and
then the property descends at an approximately 3: 1 slope to the westerly property line and
the Buena Vista Lagoon. A small easterly portion of the site currently drains to Jefferson
Street. No significant vegetation exists on the site that would need to be removed for the
proposed development.
The project proposes to redevelop the property by constructing a new single-family
residence and attached garage, driveway, pool, and planters. The project proposes to
maintain the historical drainage patterns.
Per the County of San Diego Hydrology Manual's Soil Hydrologic Group Map the
project appears to have soil group B present.
In preparation of this Storm Water Mitigation Plan for the De Anda Residence, Sampo
Engineering, Inc. (SEI) reviewed the previously approved project plans for the property
adjacent to the north, project soils report prepared by GeoSoils, Inc., and miscellaneous
record drawings adjacent to the subject property.
SEI conducted a site visit and field reconnaissance on May 30, 2013 to verify existing
drainage patterns and potential sources of pollution. Photos were taken of the
undeveloped project area, Jefferson Street, drainage structures, and landscaping that
currently exists.
SEI prepared a Hydrology Study of the project area to assist with preparation of this
SWMP.
No evidence of erosion was observed during SEI's site visit of May 30, 2013. Very little
trash or debris was found within the project area. All construction related activities for
the project to the north appear to be entirely within the project area.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
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1.1 Site Development Opportunities and Constraints
Common with any proposed development, the proposed project has its own unique
characteristics that present opportunities and constraints for storm water control and
treatment. Some constraints that are anticipated for the proposed development of the
project are based on the existing topography and underlying soil conditions. The project
area lies mostly within a previously graded area that is relatively flat, but a portion lies
within the existing slope. Per the project's Geotechnical Report the proposed residence
sits atop an existing slope, and therefore infiltration is not recommended for the subject
property. In order to prevent infiltration adjacent to building foundations from the
proposed bioretention areas and flow through planters impermeable liners will need to be
utilized. In addition, an Environmentally Sensitive Area (ESA) is located directly
adjacent to the property on the west.
The site presents opportunities for storm water control and treatment. Although much of
the property consists of a steep slope, a considerable area still remains of relatively flat,
usable land. A portion of this area can be used for storm water treatment and control
employing Integrated Management Practices (IMP's). An existing curb inlet and public
storm drain is located northerly of the site at the intersection of Jefferson Street and Las
Flores Drive that will convey the small amount of on-site storm water that is directed to
Jefferson Street. The remainder of the on-site developed area will be treated in bio-
retention basins and will drain directly to the Buena Vista Lagoon.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
4
0 1.2 Nearby Water Bodies, Existing Storm Drain Systems
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No existing public storm drain systems are located on the subject property. Storm water
draining from the westerly portion of the property travels overland westerly to the Buena
Vista Lagoon before reaching the Pacific Ocean. The small portion of the property that
drains to the east to the curb and gutter in Jefferson Street that drains northerly to an
existing curb inlet located in the intersection of Jefferson Street and Las Flores Drive.
The curb inlet then drains westerly directly to the shore of the Buena Vista Lagoon via
18" ACP public storm drain.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
5
2.0 Applicable Storm Water Standards
The project has been determined to be classified as a Priority Development Project,
because the subject property lies within 200 feet of an Environmentally Sensitive Area
(ESA). Storm water quality standards will be required per the current City of Carlsbad
SUSMP. LID and numerically sized treatment control facilities are designed for the
project hereon.
The project is exempt from Hydromodification standards. The westerly basin of the
subject property drains directly to a tidally-influenced lagoon (node 6). The easterly
basin of the subject property drains to a PCC curb and gutter in Jefferson Street, then
northerly to a curb inlet at the intersection with Las Flores, and is then piped directly to
the lagoon (nodes 6 & 7).
See attached Storm Water Standards Questionaire (E-34)
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
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Q 3.0 Identify Pollutants of Concern
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The project proposes to redevelop the property by constructing a new single-family
residence and attached garage, driveway, pool and spa, and planters. Pollutants
anticipated for this type of land use are sediment, nutrients, trash & debris, oxygen
demanding substances, oil & grease, bacteria & viruses, and pesticides.
The project lies within the Carlsbad Watershed in the Buena Vista Creek Hydrologic
Area (904.2). Storm water from the site drains to the Buena Vista Lagoon before
reaching the Pacific Ocean.
The Buena Vista Creek is listed as an impaired water body per 303d listing for indicator
bacteria, nutrients, and sedimentation/siltation.
The Buena Vista Lagoon has many beneficial uses including public trails surrounding the
lagoon, and fishing.
Indicator bacteria, nutrients, and sediment are primary pollutants-of-concern for the
proposed project and shall be mitigated with treatment control BMP's.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
7
4.0 Source Control Measures
Source Control BMP's consist of scheduling of activities, prohibition of certain practices,
maintenance procedures, and education to prevent storm water pollution by reducing the
potential for contamination at the source. Proper site planning, land use, and structural or
nonstructural measures can achieve this.
POTENTIAL PERMANENT SOURCE CONTROL BMP'S
SOURCE OF
RUNOFF
POLLUTANTS
A. On-site storm Mark all inlets with the words, "No Dumping!
drain inlets Flows to Ocean"
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B. Need for Buildings designed to discourage entry of pests
future indoor &
structural pest
control
C. Landscape/ Final Landscape Plans shall:
Outdoor • Preserve existing native trees, shrubs, and
Pesticide Use ground cover to the maximum extent
practical.
• Design landscaping to minimize irrigation
and runoff, to promote surface infiltration
where appropriate, and to minimize the use
of fertilizers and pesticides that can
contribute to storm water pollution.
• Where landscaped areas are used to retain or
detain storm water, specify plants that are
tolerant of saturated soils conditions.
• Consider using pest resistant plants,
especially adjacent to hardscape.
• To insure successful establishment, select
plants appropriate to site soils, slopes,
I\ climate, sun, wind, rain, land use, air
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De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
OPERATIONAL SOURCE
CONTROL BMP'S
• Maintain and periodically
repaint or replace inlet
markings.
• Provide storm water pollution
prevention information to
new site owners, lessees, or
operators.
• See applicable operational
BMP's in Fact Sheet SC-44,
"Drainage System
Maintenance," in the CASQA
Handbook.
• Provide Integrated Pest
Management information to
owners, lessees, and
operators.
• Maintain landscaping using
minimum or no pesticides.
• See applicable operational
BMP's in Fact Sheet SC-41,
"Building and Grounds
Maintenance," in the CASQA
Stormwater Quality
Handbook
• Provide IPM information to
new owners, lessees, and
operators.
Sampo Engineering, Inc.
7/30/2014
8
movement, ecological consistency, and plant
interactions.
POTENTIAL PERMANENT SOURCE CONTROL
SOURCE OF BMP'S
RUNOFF
POLLUTANTS
D. Refuse Areas • Site refuse to be handled in covered
trash cans in garage.
• Signs will be posted on or near
dumpsters with the words, "Do not
dump hazardous materials here."
E. Vehicle and Car wash area not provided on-site. No
Equipment facilities will be made available.
Cleaning
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De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
OPERATIONAL SOURCE CONTROL
BMP'S
Adequate number of receptacles to be
located on site, inspected for leaks regularly,
and covered. Any spills to be cleaned up
immediately.
Not Applicable
Sampo Engineering, Inc.
7/30/2014
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0 5.0 Low Impact Development {LID) Design Strategies
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The project proposes to redevelop the property by constructing a new single-family
residence and attached garage, driveway, pool, and planters on a property within 200 feet
of an Environmentally Sensitive Area (ESA), thereby classifying the project as a
"Priority Development Project." The proposed development utilizes Low Impact
Development (LID) principles to the Maximum Extent Practical. The project proposes
using an undeveloped pad area on-site to construct the residence and improvements. The
project proposes to be setback from the lagoon and ESA. Although no natural landforms
exist since the site has been previously graded, the project proposes to optimize the site
layout by minimizing additional impervious areas by minimizing the size of the single-
family residence and driveway. A portion of the driveway is proposed to constructed of
permeable pavers. The project also proposes preserving the relatively flat pervious area.
Landscaping or ground cover will be used outside of the residence and driveway to
prevent erosion of the surface of the soil and slopes, enhance moisture retention, and
inhibit the growth of weeds. Although no natural drainage courses exist, the project
proposes to maintain draining the site to the lagoon and the existing storm drain located
to the north.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
10
0 6.0 Integrated Management Practices (IMP's)
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To satisfy storm water quality standards for treatment and flow control the project
proposes the use oflntegrated Management Practices (IMP's). As a "Priority
Development Project," numerically sized IMP's will be incorporated with the design of
the project for treatment control. The project will be exempt from hydromodification
requirements, however a gravel storage layer will also be implemented for flow control.
Multiple Flow Through Planters and Bioretention facilities will be integrated with the
landscape design to provide treatment and flow control of runoff from the proposed
residence, driveway, and hardscape areas to target the pollutants of concern.
Bioretention detains runoff in a surface reservoir, filters it through plant roots and a
biologically active soil mix, stores runoff in a subsurface aggregate storage layer, and
then infiltrates it into the ground. Per the project's soils engineer's recommendations the
bioretention facilities shall be underlain with an impermeable liner and sub drain system
for slope stability where infiltration cannot be allowed, sizing factors and criteria for the
flow through planter is utilized.
Sizing of the bioretention basins and flow through planters uses "water quality only"
sizing factors from the County of San Diego Final Hydromodification Plan.
See attached BMP Site Plan for IMP locations and the following tabulation for
calculations of the sizing for the treatment and flow control facilities.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
11
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7 .0 Documentation of Storm Water Design
To satisfy storm water quality standards for treatment and flow control the project
proposes the use oflntegrated Management Practices (IMP's). The project site has been
divided into five Drainage Management Areas (DMA's) and each DMA drains to one
IMP area for storm water treatment and flow control (see attached BMP Site Plan). The
following tables show the calculations and sizing factors used to calculate the IMP's.
DMACode:
DMA Description:
Post Project
Surface Tvpe
Roof /Hardscaoe
Permeable Pavers
LandscapinQ
IMP area
DMACode:
DMA Description:
Post Project
Surface Type
Roof/Hardscaoe
Permeable Pavers
LandscapinQ
IMP area
De Anda Residence
CDP 13-30/13-31
1 Total Basin Area: 11,106 sf
Northeast portion of property tributary to Jefferson Street
Soil Type: IMP type
DMA DMAarea
Area Runoff x runoff
(sf} factor factor B bioretention basin
843 1.0 843
0 0.6 0
157 0.1 16
106 0 0 IMP Sizing
factor (WQ Minimum Proposed
only) Area Area
Total 859 0.04 34 I 50
2 Total Basin Area: 2,006 sf
Southeast portion of property tributary to Jefferson Street
Soil Type: IMP type
DMA DMAarea
Area Runoff x runoff
(sf} factor factor B bioretention basin
1713 1.0 1713
0 0.6 0
144 0.1 14
149 0 0 IMP Sizing
factor(WQ Minimum Proposed
only) Area Area
Total 1727 0.04 69 I 84
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
12
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DMACode:
DMA Description:
Post Project
Surface Type
Roof /Hard scape
Permeable Pavers
Landscaping
IMP area
DMACode:
DMA Description:
Post Project
Surface Type
Roof/Hard scape
Permeable Pavers
Landscaping
IMP area
DMACode:
DMA Description:
Post Project
Surface Type
Roof/Hardscape
Permeable Pavers
Landscaping
IMP area
De Anda Residence
CDP 13-30/13-31
3 Total Basin Area:
Southerly portion of property tributary to west
Soil Type:
DMA DMAarea
Area Runoff x runoff
(sf) factor factor B
736 1.0 736
0 0.6 0
128 0.1 13
73 0 0 IMP Sizing
factor (WQ
only)
Total 749 0.04
4 Total Basin Area:
Northerly portion of property tributary to West
Soil Type:
DMA DMAarea
Area Runoff x runoff
(sf) factor factor B
1515 1.0 1515
0 0.6 0
86 0.1 9
69 0 0 IMP Sizing
factor (WQ
only)
Total 1524 0.04
5 Total Basin Area:
Westerly portion of property tribtary to west
Soil Type:
DMA DMAarea
Area Runoff x runoff
(sf) factor factor B
157 1.0 157
0 0.6 0
0 0.1 0
37 0 0 IMP Sizing
factor(WQ
onlv)
Total 157 0.04
937 sf
IMP type
flow through planter
Minimum Proposed
Area Area
30 I 41
1,669 sf
IMP type
flow through planter
Minimum Proposed
Area Area
61 I 69
194 sf
IMP type
flow through planter
Minimum Proposed
Area Area
61 37
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
13
0 8.0 BMP Facility Maintenance Requirements
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The City Engineer will not consider structural Treatment Control BMPs and LID IMPs as
meeting the maximum extent practicable standard (MEP), unless the applicant identifies a
specific maintenance mechanism and implements a storm water operation and
maintenance plan (O&M Plan) to ensure ongoing long-term inspection and maintenance
of all structural Treatment Control BMPs and IMPs. This mechanism shall be proposed
by the applicant as part of the SWMP. Processing an O&M Plan is among the
requirements to obtain a grading permit during the final engineering phase of a Priority
Development Project.
The SWMP identifies one of the following Priority Development Project maintenance
mechanisms to ensure long-term facility maintenance.
A supporting O&M Plan has been developed and is located in the attachments section of
this report.
MaintenanceiMechanism . ·-· ..•. ,_.,..; ... ,. ..
Conditional use permits -For discretionary projects only, the City may assure
D maintenance of storm water BMPs through the inclusion of maintenance conditions in the
conditional use permit. A non-refundable security may be required.
D
D
D
Project proponent agreement to maintain storm water BMPs -The City may enter
into a contract with the project proponent obliging the project proponent to maintain,
repair and replace the storm water BMP as necessary into perpetuity. A non-refundable
security may be required.
Conditional use permits -For discretionary projects only, the City may assure
maintenance of storm water BMPs through the inclusion of maintenance conditions in the
conditional use permit. A non-refundable security may be required.
Lease provisions -In those cases where the City holds title to the land in question and
the land is being leased to another party for private or public use, the City may assure
storm water BMP maintenance, repair and replacement through conditions in the lease.
Assessment districts -The City may approve an Assessment District or other funding
mechanism created by the project proponent to provide funds for storm water BMP
maintenance, repair and replacement on an ongoing basis. Any agreement with such a
District shall be subject to the Public Entity Maintenance Provisions below.
Public entity maintenance -The City may approve a public or acceptable quasi-public
entity ( e.g., the County Flood Control District, or annex to an existing assessment district,
an existing utility district, a state or federal resource agency, or a conservation
conservancy) to assume responsibility for maintenance, repair and replacement of the
BMP. Public entity maintenance agreements shall ensure estimated costs and front-funded D or reliably guaranteed, ( e.g., through a trust fund, assessment district, fees, bond, letter of
credit or similar means). In addition, the City may seek protection from liability by
appropriate releases and indemnities. The City Engineer shall have the authority to
approve storm water BMPs proposed for transfer to any other public entity within its
jurisdiction before installation. The City shall be involved in the negotiation of
maintenance requirements with any other public entities accenting maintenance
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
14
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responsibilities within their respective jurisdictions; and in negotiations with the resource
agencies responsible for issuing permits for the construction and/or maintenance of the
facilities. The City must be identified as a third party beneficiary empowered to enforce
any such maintenance a~eement within their respective jurisdictions.
Alternative mechanisms -The City may accept alternative maintenance mechanisms if
D such mechanisms are as protective as those listed above. Alternative mechanisms must be
aooroved by the City Attorney and the City Engineer.
Comment: The Applicant will enter maintenance agreement with the City to satisfy storm water
maintenance requirements.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
15
0 9.0 SWMP Certification Statement
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The selection, sizing, and preliminary design of storm water treatment and other control
measures in this plan meet the requirements of Regional Water Quality Control Board
Order R9-2007-0001 and subsequent amendments.
I understand and acknowledge that the plan check review of the Storm Water Mitigation
Plan by the City of Carlsbad is a review for the limited purpose of ensuring the Plan and
design complies with requirements of the City, Regional Water Quality Control Board,
San Diego Region, and other applicable policies and ordinances. The review of this plan
by City Staff is not a determination of the technical adequacy of the design of Storm
Water Mitigation Plan. Such review of the Plan does not relieve me of my responsibility
for the design and content of the Storm Water Mitigation Plan.
De Anda Residence (CDP 13-30/13-31)
r/~£.1.en 44113
Vincent L. Sampo PE No.
Engineer-of-Work
Sampo Engineering, Inc.
171 Saxony Road Suite 213
Encinitas, CA 92024
De Anda Residence
CDP 13-30/13-31
6ate
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
16
«~ ~ CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
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 (BMP's) into the project
design per the City's Standard Urban Stormwater Management Plan (SUSMP). To view the SUSMP, refer to the Engineering Standards
(Volume 4, Chapter 2) at www.carlsbadca.gov/standards.
Initially 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 Stormwater Requirements' or be subject to additional criteria called 'Priority Development Project Requirements'. Many
aspects of project site design are dependent upon the storm water standards applied to a project.
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 separate completed and signed questionnaire must be submitted for each new development application submission. Only one
completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently.
In addition to this questionnaire, you must also complete, sign and submit a Project Threat Assessment Form with construction permits
for the project.
Please start by completing Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your
application to the city.
STEP1
TO BE COMPLETED FOR ALL PROJECTS
To determine if your project is a priority development project, please answer the following questions:
YES NO
1. Is your project LIMITED TO constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet
the following criteria: (1) Designed and constructed to direct storm water runoff to adjacent vegetated areas, or X other non-erodible permeable areas; OR (2) designed and constructed to be hydraulically disconnected from
paved streets or roads; OR (3) designed and constructed with permeable pavements or surfaces in
accordance with USEPA Green Streets guidance?
2. Is your project LIMITED TO retrofitting or redeveloping existing paved alleys, streets, or roads that are X designed and constructed in accordance with the USEPA Green Streets guidance?
If you answered "yes" to one or more of the above questions, then your project is NOT a priority development project and therefore is
NOT subject to the storm water criteria required for priority development projects. Go to step 4, mark the last box stating "my
project does not meet PDP requirements" and complete applicant information.
If you answered "no· to both questions, then go to Step 2.
E-34 Page 1 of 3 Effective 6/27/13
«~ ~ CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
STEP2
TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS
To determine if your project is a priority development project, please answer the following questions: YES
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 creating or replacing 5,000 square feet or more of impervious surface collectively over the entire X 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 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.
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 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 parkina or storaae of motor vehicles used personally for business or for commerce.
6. 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 street, road, highway freeway or driveway? 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 or replaces 2,500 square feet or more of
impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive X 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 commingles with flows from adjacent lands).•
8. Is your project a new development 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 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.
1 O. ls 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 . ls 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%?
NO
X
X
X
X
X
X
X
X
X
If you answered "yes" to one or more of the above questions, you ARE a priority development project and are therefore subject to
implementing structural Best Management Practices (BMP's) in addition to implementing Standard Storm Water Requirements such
as source control and low impact development BMP's. A Storm Water Management Plan (SWMP) must be submitted with your
application(s) for development. Go to step 3 for redevelopment projects. For new projects, go to step 4 at the end of this
questionnaire, check the "my project meets PDP requirements" box and complete applicant information.
If you answered "no" to all of the above questions, you ARE NOT a priority development project and are therefore subject to
implementing only Standard Storm Water Requirements such as source control and low impact development BMP's required for all
development projects. A Storm Water Management Plan (SWMP) is not required with your application(s) for development. Go to step
4 at the end of this questionnaire, check the "my project does not meet PDP requirements" box and complete applicant
information.
e-34 Page 2 of 3 Effective 6/27/13
«~ ~ CI T Y OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
STEP3
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPEMENT PROJECTS ONLY
Complete the questions below reqardinq your redevelooment oroiect: YES
Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than I I 50% of the surface area of the oreviouslv existina develooment?
If you answered "yes," the structural BMP's required for Priority Development Projects apply only to the creation or replacement of
impervious surface and not the entire development. Go to step 4, check the "my project meets PDP requirements" box and
complete applicant information.
NO
If you answered "no," the structural BMP's required for Priority Development Projects apply to the entire development. Go to step 4,
check the "my project meets PDP reauirements" box and comolete aoolicant information.
STEP4
CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION
iJ My project meets PRIORITY DEVELOPMENT PROJECT (PDP) requirements and must comply with additional stormwater
criteria per the SUSMP and I understand I must prepare a Storm Water Management Plan for submittal at time of application.
I understand flow control (hydromodification) requirements may apply to my project. Refer to SUSMP for details.
D My project does not meet PDP requirements and must only comply with ST ANDA RD STORMWATER REQUIREMENTS per
the SUSMP. As part of these requirements, I will incorporate low impact development strategies throughout my project.
Applicant Information and Signature Box
Accessor's Parcel Number(s):
155-140-41
Applicant Tiijff Cl.. <.v "l'«C
Date: 7/3t/;j
This Box for City Use Only
City Concurrence:
By:
Date:
Project ID:
I YES I NO
I I
• 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
quivalent under the Multi Species Conservation Program within the Cities and County of San Diego; and any other equivalent
environmentally sensitive areas which have been identified by the Copermittees.
E-34 Page 3 of 3 Effective 6/27 /13
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De Anda Residence
CDP 13-30/13-31
ATTACHMENTS
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
17
Vicinity Map
1n.,,,-11r,_1tl
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fxti:.f'~1:1, :a1 a"ld
Will 'Suit .. , r.,r,'"n~
StM:do ""
De Anda Residence
CDP 13 -30/13 -31
li
~
)1·,.:1,,rtl":J,
Priority Development Storm Water Management Plan
L•';tuO
h tcT1dl:dS1ay
At1"1t1•.;••loltl"i1n
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Ii' Q
..
fHt> .. ~Vuta u~n,,1,41,:y
S,.;.hoc;I
~ Lnrtl)tu '· C'h.~ch-NH.NC:1)(!
Sampo Engineering, Inc.
7/30/2014
18
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Hydrology Calculations
Pre-Development Rational Methocl'Hydrology:Calctilations. (Basiri~West) .. .. . .. . . . .. ' ,... · .. ·
Storm p6 C I Area Tc Q Velocity Volume (fl3) Frequency (adjusted) (acres) (cfs) (fps)
100-year 2.5 0.38 3.85 0.351 11.5 0.5
Pre-Development Rational· Method!Hydrology Calculations (Basin-East)
, . . ... .
Storm p6 C I Area Tc Q Velocity Volume (ft3) Frequency (adjusted) (acres) (cfs) (fps)
100-year 2.5 0.35 6.59 0.023 5.0 0.1
Post-Development. Rational. Method• Hydrology .Cal~ulations:(easin-West) . ' . · .. ,. .. . . . .
Storm p6 C I Area Tc Q Velocity Volume (ft3) Frequency (adjusted) (acres) (cfs) (fps)
100-year 2.5 0.49 4.32 0.297 9.6 0.6
Post-Development Rational Method Hydrology Calculations (Basin-East)
Storm p6 C I Area Tc Q Velocity Volume (ft3) Frequency (adjusted) (acres) (cfs) (fps)
100-year 2.5 0.79 6.59 0.078 5.0 0.4
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
19
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OPERATION AND MAINTENANCE
PLANS
The City Municipal Code requires a description of the long-term maintenance
requirements of proposed BMPs and a description of the mechanism that will
ensure ongoing long-term maintenance.
Responsible Party
The responsible party for long term maintenance of permanent treatment control
BMPs outside of public right-of-ways will ,be the property owner.
Site Design, Source Control, and Detention Basin
Maintenance
Permanent storm water BMPs for this project consist of site design, source control, and
treatment control BMPs. The following text describes the designated responsible
party that will be responsible for ensuring the ongoing effectiveness and
maintenance of each permanent storm water BMP. General indications for
effectiveness and required maintenance of each permanent storm water BMP are
discussed, however, it is important for the owner or responsible party to contact the
manufacturer of each structural BMP for additional information and guidance.
The designated responsible party shall maintain record of inspections, maintenance
cleanings, and servicing of all permanent storm water BMPs for at least 5 years.
Site Design
• Maintain vegetation throughout vegetated areas and slopes.
• To be maintained by the property owner.
Source Control .
Educational material will be distributed to the owner to ensure their understanding of
the importance of source control for pollution prevention. This material shall
include, but not be limited to:
• Integrated pest management principles (i.e. minimizing the use of pesticides)
o To be maintained by an the property owner.
• Efficient irrigation systems (i.e. preventing irrigation runoff and/or over-
irrigation)
o To be maintained by the individual property owner.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
20
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• Pollution prevention "stenciling and signage" (i.e. inlet stenciling and
"no dumping" signs)
o To be maintained by the Citymaintenance
Treatment Control BMP
Maintenance
There are two types of structural treatment control BMPs proposed for the De Anda
Residence project, private Bio-Retention basins and flow through planters.
Bio-Retention Basins
The basins will be maintained by the property owner. Periodic inspections of the
basins will be conducted at regular intervals throughout the rainy season (October
1 through April 30). The inlets and outlets for each detention basin will be inspected
for trash, litter, debris, or other solid materials that may hinder the intended
functioning of the basins. Any eroded areas will be restored andre-vegetated, while
invasive species will be removed as needed.
The maintenance procedure for servicing the detention basins consists mostly of
sediment, trash, and debris removal. In addition, vegetation management will have to
be taken into consideration. Typical activities and frequencies include:
1. Schedule semiannual inspection at the beginning and end of the wet
season for standing water, slope stability, sediment accumulation, trash and
debris, and the presence of burrows.
2. Remove accumulated trash and debris in the basin and around the riser or
pipe/outlet during the semiannual inspections. The frequency of the activity
may be altered to meet specific site conditions.
3. Trim vegetation at the beginning and end of the wet season and
inspect monthly to prevent the establishment of woody vegetation and for
aesthetic and vector reasons.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
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4. Remove accumulated sediment and re-grade about every 10-years,
or when the accumulated sediment volume exceeds 10 percent of the basin
volume. Inspect the basin each year for accumulated sediment volume.
The basins may require maintenance attention two times a year, but clearing
frequencies are highly dependent upon many factors and are difficult to predict.
Flow Through Planters
See Bio-Retention basin maintenance plan.
De Anda Residence
CDP 13-30/13-31
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
7/30/2014
22
\
i _)--~~~~~~~~~~~~~~~~-,-~~ . ) r
n Ojego Counry Hydro.logy Maou.il
. te: June 2003
Table3-1
Section: Page: .
RUNOFF COEFFICIBNTS-FOR VRBAN .AREAS
~C$ EJctnems
s~N:wralTmaia~)
Density. ltesideo.tial (I.DR}
[)enS11y~{LDR)
~Residen~WQR) .. . .
m;t Density ~~l,(MPIQ
~,~tylt~~~)
DJ Density~(MDR)
1DrDcnsity-J.tesidemial=(MDR)
lemity Residential ~R)
easity Residential (HOR)
ma.fl.[ndu~. (N. Com)
icial/Indus1r¥ (G. Com)
rda.llindus~.(O.P. ~)
:ciaJ/Industrial (Limited I)
~{&en~I.)
Laud Use
-CQuaty_Elem~ts
Residemial l.O DU/A or les.s
~tial. 2.0 DU/A or la$
~~ia,1,.2:.9 ~~ leas
~~-~4p.u/"'-~~
~.l 1~W./Aor#SS
~ 10.9DU/A.ot.Jess . . . .
Residential i4.S DU/A or iess
~rial. .2'4.0 DU/~ or.Jess
Resideiitial 43.0 PU}A or less
Neipbo,rhood Commercial
Gener.al Commeicial
Office PmfcssionaJ/Co.mmercial
Limited Industrial
Gcaeta1 Industriai
%,~
0-
10
20
25
~
40
45
so
65
80
80
85
. 90
90
95
A
0..20
0?7
034
038
0.41
O~-f~
0.52
0.55
0.66
0.76
0.76
0.80
0.83
0.83
0.87
Ruoa!reodiicieot·-c-
Soil Type
i3 C
.0.25 -0.30
032 0.36
. ().,38 Q.42
0.41 0.45·
0.4S. 0.48
<Ul -0;54-
0$,if 0.57
0;58 0.60
0.67 o~cw
~n 0.78
0.17 0.18
0.80 0.81
0~84 0.84
0.84 0.34.
0.87 0.!7
·, I ' l ,J,
3
6of26
D
~35
0..4.t
~-46
0.49
O.S2
.0.5,1
0.60
0.63
0.11
0.79
0.79
0.82
0.85
0.85
O.S7
lucs. associated with 0% impcnious .may be used for. di:f;e;ct _c.alcubtjo.o ·Of the rono.ff codl:i:cient 3$ described in Sedi~ 3.1.2 (rq>~g the pemoU$ rutJDff'
11t. Cp, for 1k soil type). ot ~ areas that will remain ~disturbe4 in PefPC'huo/-Justification must be given that the aiea will remain~ f«eVcr (e.g., the asea .
l in Clevekmd Naiimµi Forest).
twelliag • per acre
N"atio.nal Resources Conservati~ SetVice
3-6
0 0 0
..... , -\ •• ·.J \.· ...... --~-----;___ _______ ··.:·1
1 W1
I 2f.g% slope7T///.
100 1.5 I . .. ~ L f :/'-I Y4 130
fjj w
lL
~
UJ 0 ! Cl) c
1.11 ~ ::)
0 0 a: . ~ ::
"ffJ
I!! ::, z --I • I -""' ~ ff-· _.., "1 -~ I · ~ f· I ~ 120 :,: . ~~~~ ~ :a,... _a.II
~-0
EXAMPLE:
Given: Watercourse Distance {O) = 70 Feet
Slope (s) = 1.3%
Runoff Coefficient (CJ= 0.41
Overland Row Time (T} = 9.5 Mint$:?S
T= 1.8 (1.1-C) Vo
. 3Vs
~
SOURCE: Airport Dra~flage, Federal Aviation Administration, 1965
FIGURE
RafionaJ Formula -Overland Time of Flow Nomograpta 3.3
0 0 0
"j -:. ---· ·~4c -• / ' ' • • c,;, ' :.-~--,--':·,. . >•' . . )-. .'///·--· ! --.. ••• • • ' .; ::: : ;:-·.::::: . ,. -7.f)-.••. ~-. • s: : t .. t·k
',;,~-~ • .-.: •• ' ~~ ·i:;2' . / ':'fl :,1. >/ ,-• --•. • ~ ·-• "• • v· ' . •• •.... :·~,. .,:,:: ' t 'E!:) •.• •• a .. :.:;;:r:;::f:J~:.i ;:.-.~~;:t),~:~< i . ·····"-'-···· ........
--------~----------=---=---------------·~-"'-a< . .,,.._,-.~,~~~=--~-•-·n~----"•--.._.,--..,~..._,,_,,~-M'"-~' --~-~-~-,,-·~•--··-••••"-
... l·····-.!·-···+······L ........ .
,,;<:[: ;-~~~ ;:'
~r I , I I ,,. ... -,._~ ..... 1 .....
\•I ' " .
County of San Diego
Hydrology Manual
Rainfall Jsopluvials
100 Year Rainfall Event-24 Hours
lsopluvial (inches)
PW ~GIS
Depa,tmamof Pubtic Worlcl: We Hav.:: San Diego Covered! G~~lt»'tlm-ilf.'Qr.S;v,r,:(:lff"
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THIS MAP IS PROVIDED WITHOIIT WARRANTY OF NN KIND, EITHER EXPRESS
OR IMPLIED, INCi.UC iNG, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND RTNESS FOR A PARTICULAR PURPOSE.
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-.., perml11lon cl SANDAG.
Thil pmduct rnoy conllin lnlcrmotlon -hll beln repn,duced with pennlllion granf8d by Thomas lln>thelo Maps.
Miles
~~~~~~~~~~~~·~~~~~~~~~~~~~
County of San Diego
Hydrology Manual
Rainfall /sopluvials
100 Year Rainfall Event - 6 Hours
lsopluvial (inches)
PW ~GIS
Depa,tmanr -af A.dffic Worlcl: \);,'e H,1~;.: San Diego Cnvcf(:J.! Gt~~l.rffu.rrr.~5~
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THIS MAP IS PROVIDED WITHOl/T WARRANTY OF N« KIND, EITHER EXPRESS
OR IM'LIED, INCLUDING. Bl/T NOT LIMITED TO, THE IM'LIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Copyright SanGIS. All Rlghlll -.
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