HomeMy WebLinkAboutCDP 13-30; De Anda Residence; Coastal Development Permit (CDP) (6)SWMP 13-XX
(CDP 13-XX)
CITY OF CARLSBAD
ENGINEERING DIVISION
PRIORITY DEVELOPMENT PROJECT
STORM WATER MANAGEMENT PLAN
FOR
DE ANDA RESIDENCE
ENGINEER OF WORK
VINCENT L SAMPO - RCE 44173
PREPARED FOR:
DE ANDA RESIDENCE
PREPARED BY:
SAMPO ENGINEERING, INC.
1034 SECOND STREET
ENCINITAS, CA 92024
760-436-0660
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/25/2013
1
TABLE OF CONTENTS
1. Project Setting
2. Applicable Storm Water Standards
3. Identify Pollutants of Concem
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 Calculations
Hydraulic Calculations
Storm Water Standards Questionnaire (SWSQ) E-34
Post-Constmction BMP Exhibit
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 2
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, Califomia 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 and to the east by Jefferson Street.
The subject property is currently vacant; however there is evidence that a stmcture
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 constracting a new single-family
residence and attached garage, driveway, pool and spa, and planters. The project
proposes to maintain the historical drainage pattems.
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 recoimaissance on May 30, 2013 to verify existing
drainage pattems and potential sources of pollution. Photos were taken of the
undeveloped project area, Jefferson Street, drainage stmctures, 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 littie
trash or debris was found within the project area. All constmction related activities for
the project to the north appear to be entirely within the project area.
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
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 3
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 direcfly
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 public storm drain and
energy dissipater is located northerly of the site at the intersection of Jefferson Street and
Las Flores Drive that can be utilized to control project mnoff to the east.
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 4
1.2 Nearby Water Bodies, Existing Storm Drain Systems
No existing public storm drain systems are located on the subject property. Storm water
draining fi-om 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 Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 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 direcfly adjacent to an Enviromnentally 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 fi-om Hydromodification standards. The westerly basin of the
subject property drains direcfly 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 Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 6
3.0 Identify Pollutants of Concern
The project proposes to redevelop the property by constracting 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 & virases, and pesticides.
The project lies within the Carlsbad Watershed in the Buena Vista Creek Hydrologic
Area (904.2). Storm water fi-om 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 303 d 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-concem for the
proposed project and shall be mitigated with treatment control BMP's.
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 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 plaiming, land use, and stmctural or
nonstmctural measures can achieve this.
POTENTIAL
SOURCE OF
RUNOFF
POLLUTANTS
PERMANENT SOURCE CONTROL BMP'S OPERATIONAL SOURCE
CONTROL BMP'S
A. On-site storm
drain inlets
Mark all inlets with the words, "No Dumping!
Flows to Ocean"
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.
B. Need for
future indoor &
stmctural pest
control
Buildings designed to discourage entry of pests Provide Integrated Pest
Management information to
owners, lessees, and
operators.
C. Landscape/
Outdoor
Pesticide Use
Final Landscape Plans shall:
• Preserve existing native trees, shmbs, and
ground cover to the maximum extent
practical.
• Design landscaping to minimize irrigation
and mnoff, 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,
climate, sun, wind, rain, land use, air
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.
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/25/2013
8
movement, ecological consistency, and plant
interactions.
POTENTIAL
SOURCE OF
RUNOFF
POLLUTANTS
PERMANENT SOURCE CONTROL
BMP'S
OPERATIONAL SOURCE CONTROL
BMP'S
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."
Adequate number of receptacles to be
located on site, inspected for leaks regularly,
and covered. Any spills to be cleaned up
immediately.
E. Vehicle and
Equipment
Cleaning
Car wash area not provided on-site. No
facilities will be made available.
Not Applicable
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/25/2013
9
5.0 Low Impact Development (LID) Design Strategies
The project proposes to redevelop the property by constracting a new single-family
residence and attached garage, driveway, pool and spa, and planters on a property directly
adjacent to 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 constract 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 constracted 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 Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 10
6.0 Integrated Management Practices (IMP's)
To satisfy storm water quality standards for treatment and flow control the project
proposes the use of Integrated 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 ranoff from the proposed
residence, driveway, and hardscape areas to target the pollutants of concem.
Bioretention detains ranoff in a surface reservoir, filters it through plant roots and a
biologically active soil mix, stores mnoff 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. Since infiltration cannot be allowed, sizing factors and criteria for the
flow through planter will be 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 Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 11
7.0 Documentation of Storm Water Design
To satisfy storm water quality standards for treatment and flow control the project
proposes the use of Integrated 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.
DMA Code: 1 Total Basin Area: 11,106 sf
DMA Description: Northeast portion of property tributary to Jefferson Street
Soil Type: IMP type
Post Project
Surface Type
Area
(sf)
DMA
Runoff
factor
DMA area
X runoff
factor B bioretention basin
Roof/Hardscape 843 1.0 843
Permeable Pavers 0 0.6 0
Landscaping 157 0.1 16
IMP area 106 0 0 IMP Sizing
factor (WQ
only)
IMP Sizing
factor (WQ
only)
Minimum
Area
Proposed
Area
Total 859 0.04 34 50
DMA Code: 2 Total Basin Area: 2,006 sf
DMA Description: Souttieast portion of property tributary to Jefferson Street
Soil Type: IMP type
Post Project
Surface Type
Area
(sf)
DMA
Runoff
factor
DMA area
X runoff
factor B bioretention basin
Roof/Hardscape 1713 1.0 1713
Permeable Pavers 0 0.6 0
Landscaping 144 0.1 14
IMP area 149 0 0 IMP Sizing
factor (WQ
only)
IMP Sizing
factor (WQ
only)
Minimum
Area
Proposed
Area
Total 1727 0.04 69 84
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/26/2013
12
DMA Code: 3 Total Basin Area: 937 sf
DMA Description: Southerly portion of property tributary to west
Soil Type: IMP type
Post Project
Surface Type
Area
(sf)
DMA
Runoff
factor
DMA area
X runoff
factor B flow through planter
Roof/Hardscape 736 1.0 736
Permeable Pavers 0 0.6 0
Landscaping 128 0.1 13
IMP area 73 0 0 IMP Sizing
factor (WQ
only)
IMP Sizing
factor (WQ
only)
Minimum
Area
Proposed
Area
Total 749 0.04 30 41
DMA Code: 4 Total Basin Area: 1,669 sf
DMA Description: Northerly portion of property tributary to West
Soil Type: IMP type
Post Project
Surface Type
Area
(sf)
DMA
Runoff
factor
DMA area
X runoff
factor B flow through planter
Roof/Hardscape 1515 1.0 1515
Permeable Pavers 0 0.6 0
Landscaping 86 0.1 9
IMP area 69 0 0 IMP Sizing
factor (WQ
only)
IMP Sizing
factor (WQ
only)
Minimum
Area
Proposed
Area
Total 1524 0.04 61 69
DMA Code: 5 Total Basin Area: 194 sf
DMA Description: Westerly portion of property tribtary to west
Soil Type: IMP type
Post Project
Surface Type
Area
(sf)
DMA
Runoff
factor
DMA area
X runoff
factor B flow through planter
Roof/Hardscape 157 1.0 157
Permeable Pavers 0 0.6 0
Landscaping 0 0.1 0
IMP area 37 0 0 IMP Sizing
factor (WQ
only)
IMP Sizing
factor (WQ
only)
Minimum
Area
Proposed
Area
Total 157 0.04 6 37
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/26/2013
13
8.0 BMP Facility Maintenance Requirements
The City Engineer will not consider stmctural 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 stmctural 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 will be developed and approved during the final engineering
phase of the project and prior to issuance of grading permit.
Maintenance Mechanism
•
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.
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
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 accepting maintenance
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 14
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 agreement within their respective jurisdictions.
•
Alternative mechanisms - The City may accept altemative maintenance mechanisms if
such mechanisms are as protective as those listed above. Altemative mechanisms must be
approved 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 Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 15
9.0 SWMP Certification Statement
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-xx)
44173 ?iW 13
Vincent L. Sampo PE No. Date
Engineer-of-Work
Sampo Engineering, Inc.
1034 Second Street
Encinitas, CA 92024
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 16
ATTACHMENTS
De Anda Residence Sampo Engineering, Inc.
CDP 13-XX 9/25/2013
Priority Development Storm Water Management Plan 17
Vicinity Map
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/26/2013
18
Hydrology Calculations
Pre-Development Rational Method Hydrology Calculations (Basin-West)
Storm
Frequency
P6
(adjusted) C I Area
(acres) Tc Q
(cfs)
Velocity
(fps) Volume (ft^)
100-year 2.5 0.38 3.85 0.351 11.5 0.5
Pre-Development Rational Method Hydrology Calculations (Basin-East)
Storm
Frequency (adjusted) C I Area
(acres) Tc Q
(cfs)
Velocity
(fps) Volume (ft^)
100-year 2.5 0.35 6.59 0.023 5.0 0.1
Post-Development Rational Method Hydrology Calculations (Basin-West)
Storm
Frequency
P6
(adjusted) C I Area
(acres) Tc Q
(cfs)
Velocity
(Ips) Volume (ft^)
100-year 2.5 0.49 4.32 0.297 9.6 0.6
Post-Development Rational Method Hydrology Calculations (Basin-East)
Storm
Frequency
P6
(adjusted) C I Area
(acres) Tc Q
(cfs)
Velocity
(fps) Volume (ft^)
100-year 2.5 0.79 6.59 0.078 5.0 0.4
De Anda Residence
CDP 13-XX
Priority Development Storm Water Management Plan
Sampo Engineering, Inc.
9/25/2013
19
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.qov/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 ofthe 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 ofthe 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 Section 1 and follow the instructions. When completed, sign the form at the end and submit
this with your application to the city.
SECTION 1 NEW DEVELOPMENT
Does your project meet one or more of the following criteria: YES NO
1. Housina subdivisions of 10 or more dwelllna units. Examoies: single family homes, multi-family homes,
condominium and apartments X
2. Commercial - areater than 1-acre. Anv develooment other than heavy industry or residential. Examples: hospitals;
laboratories and other medical facilities; educational institutions; recreational facilities; municipal facilities; commercial
nurseries; multi-apartment buildings; car wash facilities; mini-malls and other business complexes; shopping malls;
hotels; office buildings; public warehouses; automotive dealerships; airfields; and other light industrial facilities.
X
3. Heavy Industrial 1 Industry- areater than 1 acre. Examples: manufacturing plants, food processing plants, metal
working facilities, printing plants, and fleet storage areas (bus, truck, etc.). X
4. Automotive repair shoo. A facility categorized in any one of Standard Industrial Classification (SIC) codes 5013,
5014, 5541, 7532-7534, and 7536-7539 X
5. Restaurants. Any facility that sells prepared foods and drinks for consumption, Including stationary lunch counters
and refreshment stands selling prepared foods and drinks for Immediate consumption (SIC code 5812), where the
land area for development is greater than 5,000 square feet. Restaurants where land development is less than 5,000
square feet shall meet all SUSMP requirements except for structural treatment BMP and numeric sizing criteria
requirements and hydromodification requirements.
X
E-34 Page 1 of 3 REV 1/14/11
STORM WATER Development Services
Land Development Engineering STANDARDS Development Services
Land Development Engineering
CITY OF QUESTIONNAIRE 1635 Faraday Avenue
CARLSBAD E-34 760-602-2750
www.carlsbadca.gov
6. Hillside develooment. Any development that creates more than 5.000 souare feet of Imoen/ious surface and is
located in an area with known erosive soil conditions, where the development will grade on any natural slope that is
twenty-five percent (25%) or greater.
X
7. Envlronmentallv Sensitive Area {ESA}\ All development located within or directly adiacent^ to or discharging
directly* to an ESA (where discharges from the development or redevelopment will enter receiving waters within the
ESA), which either creates 2,500 square feet or more of impervious surface on a proposed project site or increases
the area of imperviousness of a proposed project site 10% or more of its naturally occurring condition.
X
8. Parklna lot. Area of 5.000 souare feet or more, or with 15 or more oarklng soaces. and ootentiallv exoosed to urban
runoff X
9. Streets, roads, hiahwavs. and freeways. Any paved surface that is 5,000 souare feet or areater used for the
transportation of automobiles, trucks, motorcycles, and other vehicles X
10. Retail Gasoline Outlets. Serving more than 100 vehicles oer day and areater than 5.000 souare feet X
11. Coastal Development Zone. Any oroiect located within 200 feet of the Pacific Ocean and (1) creates more than
2500 square feet of impervious surface or (2) increases impervious surface on property by more than 10%. X
12. More than 1-acre of disturbance. Proiect results in the disturbance of 1-acre or more of land and is considered a
Pollutant-generating Development Project^. X
1 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; and any other equivalent
environmentally sensitive areas which have been identified by the Copermittees.
2 "Directly adjacent" means situated within 200 feet of the Environmentally Sensitive Area.
3 "Discharging directly to" means outflow from a drainage conveyance system that is composed entirely of flows from the subject development or redevelopment site, and
not commingled vinth flow from adjacent lands.
4 Pollutant-generating Development Projects are those projects that generate pollutants at levels greater than background levels. In general, these include all projects
that contribute to an exceedance to an impaired water body or which create new impervious surfaces greater than 5000 square feet and/or introduce new landscaping
areas that require routine use of fertilizers and pesticides. In most cases linear pathway projects that are for infrequent vehicle use, such as emergency or maintenance
access, or for pedestrian or bicycle use, are not considered Pollutant-generating Development Projects if they are built with pervious surfaces or if they sheet flow to
surrounding pervious surfaces.
INSTRUCTIONS:
Section 1 Results:
If you answered YES to ANY of the questions above, your project is subject to Priority Development Project requirements. Skip Section 2 and
please proceed to Section 3. Check the "meets PRIORITY DEVELOPMENT PROJECT requirements" box in Section 3. Additional storm water
requirements will apply per the SUSMP.
If you answered NO to ALL of the questions above, then please proceed to Section 2 and follows the instructions.
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CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
SECTION 2 r SIGNIFICANT REDEVELOPMENT . .
INSTRUCTIONS: Complete the questions below regarding your project YES NO
1. Project results In the disturbance of 1 -acre or more of land and is considered a Pollutant-generating Development
Project *?
INSTRUCTIONS: If you answered NO, please proceed to question 2.
If you answered YES, then you ARE a significant redevelopment and you ARE subject to PRIORITY DEVELOPMENT PROJECT
requirements. Please check the "meets PRIORITY DEVELOPMENT PROJECT requirements" box in Section 3 below.
2. Is the project redeveloping an existing priority project type? (Priority projects are defined in Section 1)
INSTRUCTIONS: If you answered YES, please proceed to question 3.
If you answered NO, then you ARE NOT a significant redevelopment and your project is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box in Section 3 below.
3. Is the work limited to trenching and resurfacing associated with utility work; resurfacing and reconfiguring surface
parking lots and existing roadways; new sidewalk; bike lane on existing road and/or routine maintenance of damaged
pavement such as pothole repair? Resurfacing/reconfiguring parking lots is where the work does not expose underlying soil
during construction.
INSTRUCTIONS: If you answered NO, then proceed to question 4.
If you answered YES, then you ARE NOT a significant redevelopment and your project Is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box in Section 3 below.
4. Will your redevelopment project create, replace, or add at least 5,000 square feet of Impervious surfaces on existing
developed property or will your project be located within 200 feet of the Pacific Ocean and (1) create 2500 square feet or
more of impervious surface or (2) Increases impervious surface on the property by more than 10%? Replacement of
existing impervious surfaces includes any activity that is not part of routine maintenance where impervious material(s) are
removed, exposing underlying soil during construction.
INSTRUCTIONS: If you answered YES, you ARE a significant redevelopment, and you ARE subject to PRIORITY DEVELOPMENT
PROJECT requirements. Please check the "meets PRIORITY DEVELOPMENT PROJECT requirements" box In Section 3 below. Review
SUSMP to find out If SUSMP requirements apply to your project envelope or the entire project site.
If you answered NO, then you ARE NOT a significant redevelopment and your project is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box In Section 3 below.
*for definition see Footnote 4 on page 2
SECTION 3 QUESTIONNAIRE RESULTS
IHI 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.
• My project does not meet PDP requirements and must only comply with STANDARD 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 This Box for City Use Only
Address:
Jefferson Street
Assessor's Parcel Number(s):
155-140-41
Applicant Name: Applicant Title:
AppllcantJBignrfure: • Date: / /
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E-34 Page 3 of 3
City Concurrence: YES NO City Concurrence:
By:
Project ID:
REV 1/14/11