HomeMy WebLinkAboutSDP 01-10A; PRELIMINARY STORM WATER MANAGEMENT PLAN; 2012-11-13PRELIMINARY STORM WATER
MANAGEMENT PLAN
For RECEIVED
NOV 202012
ENCINAS CREEK CITY OF CARLSBAD
APARTMENT HOMES PLANNING DIVISION
SDP 01-10(A)
Prepared: February 1, 2011
Revised: March 27, 2012
id: N6Véñibe13,2012-
J.N. 10-1302-5
Prepared By:
O'DAY CONSULTANTS, INC.
2710 Loker Avenue West, Suite 100
Carlsbad, CA 92010-6609
(760) 931-7700
George O'D4 RCE 32014, Exlf. 12/31/12 Dace
TABLE OF CONTENTS
TABLEOF CONTENTS ................................................................................1
1. PROJECT SETTING...........................................................................3
2. APPLICABLE STORMWATER STANDARDS .........................3
Storm Water Standards Questionnaire ........................................... 3
HMP Applicability Determination ................................................3
3. IDENTIFY POLLUTANTS OF CONCERN...............................3
Identify pollutants associated with type of project/use..................3
Identify watershed, hydrologic unit basin and receiving waters . .4
List impaired water bodies.............................................................4
Beneficial uses of receiving water.................................................4
Summarize primary pollutants of concern.....................................5
4. SOURCE CONTROL MEASURES ...................................................5
Description of site activities and potential sources of pollutants ..5
Stormwater Pollutant Sources and Source Controls......................6
5. LOW IMPACT DEVELOPMENT (LID) DESIGN STRATEGIES ... 6
5a. Optimization of site layout ............................................................6
Limitation of development envelope.............................................6
Preservation of natural drainage features.......................................6
Setbacks of creeks, wetlands, and riparian habitats.......................6
Minimization of imperviousness ...................................................6
Using drainage as design element..................................................6
- Sb. Layout and use of pervious surfaces.............................................6
5c. Dispersal of runoff from impervious areas to pervious areas........7
6.
INTEGRATED MANAGEMENT PRACTICES (IMP's)..................7
Selection process for IMP's...........................................................7
Sizing factors for IMP's.................................................................7
Geotechnical recommendation on soil infiltration rates................7
Infiltration calculations..................................................................8
7. TREATMENT CONTROL BMP's.....................................................8
8. HYDROMODIFICATION .................................................................8
9. DOCUMENTATION OF STORMWATER WATER DESIGN........8
Hydrology maps.............................................................................8
BMP Sizing Calculator..................................................................8
Tabulation....................................................................................10
10. BMP FACILITY MAINTENANCE REQUIREMENTS .................13
10a. Ownership and responsibility of maintenance of BMP's............13
lOb. Summary of maintenance requiremenmts ...................................13
11. SWMP CERTIFICATION STATEMENTS .....................................15
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Attachments:
Vicinity map
- Storm Water Standards Questionnaire
- Figure 2-1 HMP Applicability Determination
Table 2-1: Anticipated and Potential Pollutants
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San Diego Region Hydrologic Boundary Map
303(d) list for impaired water bodies
Table 2-3 Beneficial Uses of Coastal Waters
Stormwater Pollutant Sources and Source Control Checklist
Figure 2-2 Decision Matrix I BMP exhibit
BMP Calculator Output
Undergrcund Modular Tanks Application Guide
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1. PROJECT SETTING
- The Holly Springs Multifamily Site is located in the City of Carlsbad, adjacent to the easterly
side of College Blvd and just south of Cannon Road. (See Attachment 1 for Vicinity Map.) The
existing site is comprised of a small section of natural terrain at the northern part of the site and
farmland for the rest. The grades are steep, ranging from an elevation of 160 in the southeast
corner of the property to an elevation of about 80 in the northwest portion.
The Holly Springs Multifamily Site consists of approximately 7.19 acres that will be developed
into five apartment buildings and associated parking and improvements and an Open Space lot.
There are several opportunities and constraints for storm water control and treatment on this site.
Constraints include steep slopes and the presence of Soil Type D which is relatively
impermeable. Also, the relatively high-density land use presents a challenge for storm water
treatment. Opportunities include preservation of existing natural areas and the use of extensive
landscaped areas interspersed throughout the site.
The runoff from this site will be directed to an existing storm drain in Street 'C' along the
southerly side of the site. This storm drain connects to a system that will discharge to historic
outfall locations. As in the existing condition, all runoff from the site is a tributary of the Agua
Hedionda Creek.
2. APPLICABLE STORMWATER STANDARDS
Storm Water Standards Questionnaire
Per the Storm Water Standards Questionnaire (SWSQ), this project meets PRIORITY
DEVELOPMENT PROJECT (PDP) requirements and must comply with additional stormwater
criteria per the SUSMP. (See Attachment 2 for completed SWSQ)
HMP Applicability Determination
Per Figure 2-1 of the SUSMP, Hydromodification controls are required. (See Attachment 3 for
Figure 2-1 HMP Applicability Determination.) It was determined that field investigations would
not be conducted pursuant to the SCCWRP channel screening tools. Therefore the site must
mitigate peak flows and durations based on a pre-project condition lower flow threshold of
0.1Q2.
3. IDENTIFY POLLUTANTS OF CONCERN
3a. Identify pollutants associated with type of project/use
Per Table 2-1 of the SUSMP (see Attachment 4), the pollutants anticipated from an Attached
Residential Development are:
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Sediment
Nutrients
Trash & Debris
Oxygen Demanding Substances (due to on-site landscaping)
Oil & Grease (due to uncovered parking areas)
— Bacteria & Viruses (potentially)
Pesticides
Identify watershed, hydrologic unit basin and receiving waters
The project is located in the Los Monos Hydrologic Subarea (904.31) of the Agua Hedionda
- Watershed in the Carlsbad Hydrologic Unit in the San Diego Region (Attachment 5). Under both
existing and proposed conditions, storm runoff from Holly Springs Multifamily Site existing is
eventually conveyed to Agua Hedionda Creek, and then continues westerly to Agua Hedionda
Lagoon.
List impaired water bodies
According to the California 2006 303(d) list published by the RWQCB (Attachment 6), Agua
Hedionda Creek and Agua Hedionda Lagoon are impaired water bodies associated with the
stormwater discharge from this project. Agua Hedionda Creek has impairment for manganese,
selenium, sulfates, and Total Dissolved Solids. Agua Hedionda Lagoon has impairment for
Indicator bacteria and sedimentation/siltation. Sites tributary to Clean Water Act Section 303(d)
water bodies require additional BMP implementation.
3d. Beneficial uses of receiving water
The beneficial uses for the hydrologic unit are included in Attachment 7, and the definitions are
listed below. This information comes from the Water Quality Control Plan for the San Diego
Basin.
IND - Industrial Service Supply: Includes uses of water for industrial activities that do not
depend primarily on water quality including, but not limited to, mining, cooling water supply,
hydraulic conveyance, gravel washing, fire protection, or oil-well repressurization.
NAV - Navigation: Uses of water for shipping, travel, or other transportation by private,
military, or commercial vessels.
REC 1 —Contract Recreation: Includes uses of water for recreational activities involving body
contact with water, where ingestion of water is reasonably possible. These uses include, but are
not limited to, swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water
activities, fishing, or use of natural hot springs.
REC 2 —Non-Contact Recreation: Includes the uses of water for recreational activities
involving proximity to water, but not normally involving body contact with water, where
ingestion of water is reasonably possible. These include, but are not limited to, picnicking,
sunbathing, hiking, beachcombing, camping, boating, tide pool and marine life study, hunting,
sightseeing, or aesthetic enjoyment in conjunction with the above activities.
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COMM - Commercial and Sport Fishing: Includes the uses of water for commercial or
recreational collection of fish, shellfish, or other organisms including, but not limited to, uses
involving organisms intended for human consumption or bait purposes.
BIOL - Preservation of Areas of Special Biological Significance
WARM - Warm Freshwater Habitat: Includes uses of water that support warm water
ecosystems including, but not limited to, preservation or enhancement of aquatic habitats,
vegetation, fish, or wildlife, including invertebrates.
EST - Estuarine Habitat: Includes the uses of water that support estuarine ecosystems
including, but not limited to, preservation or enhancement of estuarine habitats, vegetation, fish,
or wildlife (e.g., estuarine mammals, waterfowl, shorebirds).
MAR —Marine Habitat: Includes uses of water that support marine ecosystems including, but
not limited to, preservation or enhancement or marine habitats, vegetation such as kelp, fish,
shellfish, or wildlife (e.g., marine mammals, shorebirds).
WILD —Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including
but not limited to, preservation and enhancement of terrestrial habitats, vegetation, wildlife, (e.g.,
mammals, birds, reptiles, amphibians, invertebrates), or wildlife water food and sources.
RARE - Rare, Threatened, or Endangered Species: Includes uses of water that support
habitats necessary, at least in part, for the survival and successful maintenance of plant or animal
species established under state or federal law as rare, threatened or endangered.
AQUA - Aquaculture: Includes the use of water for aquaculture or mariculture operations
including, but not limited to, propagation, cultivation, maintenance, or harvesting of aquatic
plants and animals for human consumption or bait purposes.
MIGR —Migration of Aquatic Organisms: Includes uses of water that support habitats
necessary for migration, acclimatization between fresh and salt water, or other temporary
activities by aquatic organisms, such as anadromous fish.
SHELL - Shellfish Harvesting: Includes uses of water that support habitats suitable or the
collection of filter-feeding shellfish (e.g., clams, oysters, and mussels) for human consumption,
commercial, or sport purposes.
3e. Summarize primary pollutants of concern
The primary pollutants of concern for this project are Sediment, Nutrients, Trash & Debris,
Oxygen Demanding Substances, Oil & Grease, Bacteria a& Viruses, and Pesticides. The
extensive use of bioretention facilities throughout the site should be a highly effective method of
treating Coarse Sediment and Trash, and Pollutants that tend to associate with fine particles
during treatment. Bioretention facilities also show medium effectiveness for treatment of
Pollutants that tend to be dissolved following treatment.
4. SOURCE CONTROL MEASURES
4a. Description of site activities and potential sources of pollutants
Potential sources of pollutants on the project site include:
On-site storm drain inlets
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Landscape/Outdoor Pesticide Use
Refuse areas
Roofing, gutters, and trim
Plazas, sidewalks, and parking lots
4b. Stormwater Pollutant Sources and Source Controls
See attachment 8 for Stormwater Pollutant Sources and Source Control Checklist
5. LOW IMPACT DEVELOPMENT (LID) DESIGN STRATEGIES
5a. Optimization of site layout
Limitation of development envelope
The development envelope of the Holly Springs Multifamily Site is confined to the area
of existing farmland (6.21 ac.), while the natural landscape in the north side of the project
is preserved in an Open Space lot (0.98 ac.). Also, this project is part of the larger
Cantarinill{olly Springs project. The Holly Springs Single Family Site designates 80.18
acres as Open Space out of a total 119.86 acres, and the Cantarini project designates
58.25 acres out of a total 156.72 acres.
Preservation of natural drainage features
The natural terrain at the north end of the site is preserved, along with its natural drainage
features.
Setbacks of creeks, wetlands, and riparian habitats
There are no creeks, wetlands, or riparian habitats on the site.
Minimization of imperviousness
In order to minimize imperviousness, the apartment buildings were designed as compact,
taller structures and the drive aisles were designed to the minimum width allowed per
zoning fire code. The parking lot was designed with the minimum number of stalls
allowed and the depths of the stalls were minimized to fit bioretention facilities around
the perimeter of the parking area.
- 5) Using drainage as design element
Landscaped areas were interspersed among the buildings and paving, and were also ' distributed around the perimeter of the parking area. These landscaped areas were
designed to be both attractive and functional.
5b. Layout and use of pervious surfaces
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Permeable pavements will be used for the majority of the parking areas as a substitute for asphalt
paving.
5c. Dispersal of runoff from impervious areas to pervious areas
Wherever possible, an attempt was made to direct runoff from impervious areas to pervious
I areas. Landscaped areas and IMP's surround buildings and sidewalks and permeable pavement
and IMP's surround the parking area.
6. INTEGRATED MANAGEMENT PRACTICES (IMP's)
6a. Selection process for IMP's
According to Table 2-2 of the SUSMP, The majority of pollutants of concern for this project can
be grouped in the category of Pollutants that tend to associate with fine particles during
treatment. Nutrients also fall under the category of Pollutants that tend to be dissolved following
treatment and Trash & Debris falls under the category of Coarse Sediment and Trash.
According to Table 2-3, Infiltration Facilities provide the highest effectiveness for removal of
pollutants in all three categories but our site is constrained by impermeable soils. B ioretention
Facilities were chosen extensively throughout the site for their high removal rates for Coarse
Sediment and Trash and Pollutants that tend to associate with fine particles during treatment and
their medium removal rates for Pollutants that tend to be dissolved following treatment.
Bioretention facilities detain stormwater and filter it slowly through soil or sand and are versatile
in that they can be any shape and can be landscaped.
1 6b. Sizing factors for IMP's
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i) Lower flow threshold determination
Field investigations were not conducted pursuant to SCCWRP screening tools.
Therefore, the site must mitigate peak flows and durations based on a pre-project
condition lower flow threshold of 0.1Q2.
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2) HMP Decision Matrix
- IMP facilities were sized using the Decision Matrices in Figures 2-2 and 2-3. See
Attachment 9.
6c. Geotechnical recommendation on soil infiltration rates
IMP facilities were chosen that do not drain through native soil, as soil infiltration rates were
anticipated to be low.
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I 6d. Infiltration calculations
Self-retaining areas were not utilized on this site, as soil infiltration rates were anticipated to be
I low. The geotechnical report, prepared by EEl dated October 24, 2012, provides measured
percolation rates that range from 0.2 inches per hour and 2.0 inches per hour (Section 9.3).
TREATMENT CONTROL BMP's
IMP sizing approach was used, therefore Treatment Control BMP' s.
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HYDROMODIFICATION
1 IMP sizing approach was used; therefore hydromodification calculations were not required.
DOCUMENTATION OF STORMWATER WATER DESIGN
I 9a. Hydrology maps
The hydrology map showing the DMA's to IMP's is included in Attachment 10.
9b. BMP Sizing Calculator
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Output from the BMP Sizing Calculator is included in Attachment 11. The areas are based on
the Bioretention with Vault. The standard depth of 4' feet, per the BMP Calculator, was utilized
for most of the Bioretention Areas, with the exception of Bioretention Area # 3. See calculation
below for Vi depth.
Bioretention Areas # 1-2 & 4-11:
In order to meet Hydromodification requirements outlined in the Final Hydromodification Plan
prepared for the County of San Diego on January 13, 2011 by Brown and Caldwell, an IMP
I sizing factor was determined from Table 7-3, see below. ' Per Table 7-3. Sizing Factors for Bioretention Plus Vault Facilities
Lower Flow Threshold: 0.1Q2
Rain Gauge= Oceanside
I Soil Type: D
Existing Slope: Steep
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Results: IMP sizing factor of 0.040,
Vi, based on 4.0' depth at 100% porosity = 0.1600A
V2 = N/A
In order to get the volume required by the hydromodification criteria, the depth of the Vi layer is
calculated as follows:
Vl= 4.0'x 0.04 A = 0.16A
Bioretention Area #3:
Since this particular Bioretention Area has almost twice the treatment area of the 0.04A required,
we have calculated the actual storage depth required based on the Vi volume specified by the
BMP Calculator results. The BMP Calculator results for this bioretention area are as follows:
BMP Calculator results:
Plan Area = 658 SF
V1=2634CFT
Depth Vi= 2634 CFT / 658 SF = 4.0 FT
Proposed Calculation results:
Proposed Plan Area = 1,592 SF
Vi =2634CFT
Depth Vi = 2634 CFT / 1592 SF = 1.65 FT
If we use Underground Modular Tanks with 90% porosity, then:
90% Porosity for Underground Modular Tanks (See Attachment 12):
Bioretention Areas # 1-2 & 4-11:
H= V 1/(0.90) = (4.0 ft x 12")/0.90 = 53.33" or 4.44 FT
So, 53.3" (4.44 feet) of modular tanks above the perforated pipe is depth required for Vi with
90% porosity instead of vault with 100% porosity at 4.0'.
Bioretention Areas # 1-2 & 4-11:
H= V1/(0.90) = (1.65 ft x 12")/0.90 = 22" or 1.85 FT
So, 22" (1.85 feet) of modular tanks above the perforated pipe is depth required for Vi with 90%
porosity instead of vault with 100% porosity at 4.0'.
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9c. Tabulation
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
IMA Area Surface Runoff Runoff
Name (sO type factor factor D Bioretention 1
1 35789 Concrete/Asphalt 1.0 35789
1A 3346 Pervious 0.1 335 Concrete
lB 5520 Pervious 0.1 552 Concrete IMP
Sizing Minimum Proposed 1C 1559 Landscaping 0.1 156 factor Area Area
Total 36832 0.04 1473 1568 IMP
Area
- Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff
Name (sO type factor factor D Bioretention 2
2 8622 Concrete/Asphalt 1.0 8622
IMP
Sizing Minimum Proposed
2A 385 Landscaping 0.1 39
factor Area Area
Total 8661 0.04 346 390 IMP
Area
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff
Name (sf) type factor factor D Bioretention 3
3 7307 Roofs 1.0 7307
IMP 3A 7794 Landscaping 0.1 779
Sizing Minimum Proposed 3B 8083 Concrete/Asphalt 1.0 8083 factor Area Area
Total 16169 0.04 647 1592 IMP
Area
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Post- DMA Soil
- DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff
Name (sO type factor factor D
I
Bioretention 4
1
4 11837 I Concrete/Asphalt 1.0 11837 IMP
4A 1884 Pervious 0.1 188 Sizing Minimum Proposed
Concrete I factor Area Area
12025 0.04 481 485 IMP I Total Area I
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff I D I Bioretention 5 Name (sO type factor factor I
5 I 7010 Concrete/Asphalt 1.0 7010 IMP
5A 2436 Pervious 0.1 244 Sizing Minimum Proposed
Concrete factor Area Area
IMP 7254 0.04 290 291 Total I i Area
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff D Bioretention 6 Name (sO type factor factor
6 4331 Concrete/Asphalt 1.0 4331
6A 12877 Concrete/Asphalt 1.0 12877
6B 3313 Pervious 0.1 331 Concrete
6C 3163 Pervious 0.1 316 Concrete IMP
6D 763 Pervious 0.1 76 Sizing Minimum Proposed
Concrete factor Area Area
Total 17931 0.04 717 1025 IMP
Area
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Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff D Bioretention 7 Name (sO type factor factor
7 I 6079 I Roofs I 1.0 6079 IMP
Sizing Minimum Proposed 7A 4985 Landscaping 0.1 499 factor Area Area
6578 0.04 263 446 IMP
Total Area
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff D Bioretention 8 Name (Sf) type factor factor I I
8 8490 Roofs 1.0 8490
IMP
Sizing Minimum Proposed
factor Area Area
8A 4192 Landscaping 0.1 419
8B 7564 Roofs 1.0 7564
8C 2410 Landscaping 0.1 241
8D 1638 Concrete/Asphalt 1.0 1638
Total 18352 0.04 734 750 IMP I
Area
Post-
DMA Project DMA DMA
DMA Area Surface Runoff Area x
Name (sO rype factor Runoff factor
1 9 6141 1 Roofs 1.0 6141
I Total 6141
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Soil
Type IMP Name
D Bioretention 9
IMP
Sizing Minimum Proposed
factor Area Area
0.04 I 246 1 248 I IMP Area
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff D Bioretention 10 Name (sO type factor factor I
10 2808 Roofs 1.0 2808
IMP
Sizing Minimum Proposed
factor
10A 4181 Concrete/Asphalt 1.0 4181
lOB 1601 Landscaping 0.1 160 Area Area
7149 0.04 286 603 IMP
Total Area
Post- DMA Soil
DMA Project DMA Area x Type IMP Name
DMA Area Surface Runoff Runoff D Bioretention 11 Name (sO type factor factor
11 11508 Concrete/Asphalt 1.0 11508 IMP
Sizing Minimum Proposed
factor Area Area
Total 11508 0.04 460 460 I IMP I Area
10. BMP FACILITY MAINTENANCE REQUIREMENTS
10a. Ownership and responsibility of maintenance of BMP's
The Owner and Developer will be responsible for the maintenance of treatment facilities.
Ongoing maintenance will be assured by executing a Permanent Stormwater Quality BMP
Maintenance Agreement that "runs with the land."
lOb. Summary of maintenance requirements
Bioretention facilities remove pollutants primarily by filtering runoff slowly through aerobic,
biologically active soil. Routine maintenance is needed to ensure that flow is unobstructed, that
erosion is prevented, and that soils are held together by plant roots and are biologically active.
Typical maintenance consists of the following:
Inspect inlets for channels, exposure of soils, or other evidence of erosion. Clear
any obstructions and remove any accumulation of sediment. Examine rock or
other material used as a splash pad and replenish if necessary.
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Inspect outlets for erosion or plugging.
Inspect side slopes for evidence of instability or erosion and correct as necessary.
Observe the surface of bioretention facility soil for uniform percolation
throughout. If portions of the bioretention facility do not drain within 72 hours
after the end of a storm, the soil should be tilled and replanted. Remove any
debris or accumulations of sediment.
Confirm that check dams and flow spreaders are in place and level and that
rivulets and channelization are effectively prevented.
Examine the vegetation to ensure that it is healthy and dense enough to provide
filtering and to protect soils from erosion. Replenish mulch as necessary, remove
fallen leaves and debris, prune large shrubs or trees, and mow turf areas. When
- mowing, remove no more than 1/3 height of grasses. Confirm that irrigation is
adequate and not excessive and that sprays do not directly enter overflow grates.
U Replace dead plants and remove noxious and invasive vegetation.
I
. Abate any potential vectors by filling holes in the ground in and around the
bioretention facility and by insuring that there are no areas where water stands
longer than 48 hours following a storm. If mosquito larvae are present and
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persistent, contact the San Diego County Vector Control Program for information
and advice. Mosquito larvicides should be applied only when absolutely
necessary and then only by a licensed individual or contractor.
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11. SWMP CERTIFICATION STATEMENTS
ha. Preparer's statement
The selection, sizing, and preliminary design of stormwater treatment and other control measures
in this plan meet the requirements of Regional Quality Control Board Order R9-2007-0001 and
subsequent amendments.
(9 2
George O'Da%RCE 32014, E'12/31/12
oti./Y 2—
Date
lib. Owner's statement
The selection, sizing, and preliminary design of stormwater treatment and other control measures
in this plan meet the requirements of Regional Quality Control Board Order R9-2007-000I and
subsequent amendments.
Ho' Springs LTD.
do Ken Cablay
Seabourne Development
ft vt-
Dat
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Attachment
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CITY OF OCEANSIDE
: SITE
CITY OF VISTA
CITY OF
SAN MARCOS
Ii
CITY OF ENCINITAS
VICINITY MAP
NO SCALE
LUll II. lUUFll
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Attachment
CITY OF
3141 "AAKNIN M, t ~Ab
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
QysomjjyJces
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
INSTRUCTIONS: 1
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 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
I questions, please seek assistance from Land Development Engineering staff.
A separate completed and signed questionnaire must be submitted for each new development application submission.
I 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
Housing subdivisions of 10 or more dwelling units. Examples: single family homes, multi-family homes,
condominium and apartments
Commercial - greater than 1-acre. Any development 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.
Heavy Industrial / Industry- greater than I acre. Examples: manufacturing plants, food processing plants, metal / working facilities, printing plants, and fleet storage areas (bus,_ truck, _etc.).
Automotive repair shop. A facility categorized in any one of Standard Industrial Classification (SIC) codes 5013, 1 5014, 5541, 7532-7534, and 7536-7539
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.
E-34 Page 1 of 3 REV 1/14/11
STORM WATER
STANDARDS
CITY 0 F QUESTIONNAIRE CARLSBAD E-34
Develo pment Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
Hillside development. Any development that creates more than 5,000 square feet of impervious 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.
Environmentally Sensitive Area (ESA)1. All development located within or directly adjacent2 to or discharging
directly3 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.
Parking lot. Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban
runoff
Streets, roads, highways, and freeways, Any paved surface that is 5,000 square feet or greater used for the
transportation of automobiles, trucks, motorcycles, and other vehicles
Retail Gasoline Outlets. Serving more than 100 vehicles per day and greater than 5,000 square feet I
Coastal Development Zone. Any project 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%.
More than 1-acre of disturbance. Project results in the disturbance of 1-acre or more of land and is considered a
Pollutant-generating Development Project4. "I
iivirorimentauy Sensitive areas include out 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 ameidmertts); water bodies
designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1 94) 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 with flow from adjacent lands.
4 Pollutant-generating Development Projects are those projects that generate pollutants at levels greater than background levels. In general, tiese 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 int-oduce 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 follow the instructions.
E-34 Page 2 of 3 REV 1/14/11
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CITY OF
CAR LSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Develooment Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
SECTION 2 SIGNIFICANT REDEVELOPMENT
INSTRUCTIONS: Complete the questions below regarding your project YES NO
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.
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, ther, 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.
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 potho,e 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.
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 suraces 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.
UIIUI I 000 FUULI IULO '+ Li! I JhIJ0
I SECTION 3 - QUESTIONNAIRE RESULTS I
I1 My project fleets 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. U 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.
I
I
Applicant Information and Signature Box
Address: Assessor's Parcel Number(s):
Applicant Name: Applicant Title:
Applicant Signature: Date:
This Box for City Use Only
City Concurrence: YES NO
By:
Date:
Project ID:
E-34 Page 3 of 3 REV 1/14/11
Attachment
3
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1
SECTION 2 IDENTIFY POLLUTANTS,
B
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F'joroxtx..-i ,IHO.oi -.-.--- ------------------.---- --- Iirii-.or.;,iu: L4.1
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FIGURE 2-1. HMP AppIicabfflo Determination*
Li
°refer to expanded HMP exemption criteria below for justit'icarions required on each node
30 City of Carlsbad SUSMP - January 14, 2011
I
Attachment
= - L1 - - - M - - - - - - - - - - -
SECTION 2: IDENTIFY POLL
U
T
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B
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TABLE 2 L ANTICIPATED AND POTENTIAL
Pollutants Generated hr Lind Use Tv,e.
General Pollutant Categories
Trash Oxygen Bacteria Pnontv Project Heavy Organic & Demanding Oil & & Categories Sediment Nutrients Metals Compounds Debns Substances Grease Viruses Iksticidc Detached
Residential X V V N V N V
Development
Attached
Residential V X K P(1) P(2) P K
Development
Commercial
Development P(l) P(l) N P(2) N P(5) N P(3) P(5 >one acre
l-Tcavv Industry K K K V V V
Automotive
X X(4)(5) X X
Repair Shops
Restaurants
X N X X P(l) Hillside
Development V V X N N N
>51)00 ft2
Parking Lots P(l) P(l) V N P(l) X PH
Retail Gasoline
Outlets
Streets,
Highways & V P(l) V X(4) V P(5) X X P(1)
Freeways
X = anticipated
P = potential
A potential pollutart if landscaping exists on-site.
A potential pollutar.t if the project includes uncav
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A potential pollutant if land use involves food or a
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.
Including petroleum hydrocarbons.
j)jncluWng solvents.
23 City of Carlsbad SUSWP
- January 14, 2011
I
Attachment
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Attachment
- I -M - - - - - - - - - - - -
- - - - - - - - 2006 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENTS REQUIRING TMDLS
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
USEI'A APPROVAL DATE: .PUNE 2. 2(107
CAIWA'FER I'OIENlIAI, ESTIMATED PROPOSED 'IMI)L
REGION 'lVI'E NAME V,VlEISI-IEI) I'OLLU'lANT/SiRESSOR SOURCES SIZE AFFECTED COMPLETION
9 R Agua Hedionda Creek 90431000
Manganese 7 Miles 2019
Source Unknown
Selenium 7 Miles 2019
Source Unknown
Sulfates 7 Miles 2019
Source Unknown
Total Dissolved Solids 7 Miles 2019
Urban Runoff/Storm Sewers
Unknown Nonpoint Source -
Unknown point source
9 E Agua Hedionda Lagoon 90431000
Indicator bacteria 6.8 Acres 2006
Nonpoint/Point Source
Sedimentation/Siltation 6.8 Acres 2019
Nonpoint/Point Source
9 R Aliso Creek 901 13000
Indicator bacteria 19 Miles 2005
This listing for indicator bacteria applies to the A/iso Creek mains/em and all the major tributaries ofAliso Creek which
are Sulphur Creek, Wood Canyon, Al/so Hills Canyon, Dairy Fork, and English Canyon.
I Irhan Runoff/Storm Sewers
Unknown point source
Nonpoint/Point Source
Phosphorus 19 Miles 2019
This listingforphosphoru.v applies to the ,4liso Creek ,nainstem and all the nw/or tributaries ofAliso Creek which are
Sulphur Creek Wood Canyon. .41,so Hills Canyon, Dairy Fork, and English Canyon.
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Page 1 0f27
Attachment
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Table 2-3. BENEFICIAL USES OF COASTAL WATERS
Coastal Waters
Hydrologic
Unit Basin
Nuiiiber
BENEFICIAL USE
D v
R
F
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1
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2
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Pacific Ocean • • • S • S • • • • • • S
Dana Point Harbor • • S • • • • • • •
Del Mar Boat Basin • • • • • • • • S •
Mission Bay 0 • • S S • • S • • S
Oceanside Harbor • • S S • • • 1 • • •
San Diego Bay 1,3 • • • • • • • • • • • • •
Coastal Lagoons
Tijuana River Estuary 11.11 • 5 • • • • • • • • •
Mouth of San Diego River 7.11 • • • • • • • • •
Famosa Slough and Channel 7.11 • • • 5 • • • • •
Los Penasquitos Lagoon 2 6.10 • • • S • • S • •
San Dieguito Lagoon 5.11 • • • • • • • • •
Batiquitos Lagoon 4.51 • • • • • • • • •
San Elijo Lagoon 4.61 • • 5 • • • S S •
Agua Hedionda Lagoon 4.31 S
-
S S S S • • • S • S S
Includes the tidal prisms of the Otay and Sweetwater Rivers.
2 Fishing from shore or boat permitted, but other water contact recreational (REC-1) uses are prohibited.
The Shelter Island Yacht Basin portion of Sari Diego By is designated as an impaired water body for dissolved copper pursuant to Clean Water Act
section 303(d). A Total Maximum Daily Load (TMDL) has been adopted to address this impairment. See Chapter 3, Water Quality Objectives for Pesticides,
Toxicity and Toxic Pollutants and Chapter 4, Total Maximum Daily Loads.
Existing Beneficial Use
Table 2-3 2 - 52
BENEFICIAL USES
Table 2-3. BENEFICIAL USES OF COASTAL WATERS
Coastal Waters
Hydrologic
Unit Basin
Number
BENEFICIAL USE
1
ID
N
v
R
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C
1
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2
c
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N
W
A
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S
L
L
Coastal Lagoons - continued
Buena Vista Lagoon 2 4.21 • • • 0 • • •
Loma Alta Slough 4.10 • • • • • •
Mouth of San Luis Rey River 3.11 • • • • •
Santa Margarita Lagoon 2.11 • • • • • • • •
Aliso Creek Mouth 1.13 • • • • •
San Juan Creek Mouth 1.27 • • • • •
San Mateo Creek Mouth 1.40 • • • • • • •
San Onofre Creek Mouth 1.51 • • • • • • •
2 Fishing from shore or boat permitted, but other water contact recreational (REC- i) uses are prohibited.
Existing Beneficial Use
0 Potential Beneficial Use
Table 2-3 2 - 53
BENEFICIAL USES
Attachment
Stormwater Pollutant Sources and Source Control Checklist
How to Use this Checklist:
Review Column I and identify which of these potential sources of stormwater pollutants apply to your project. Check each box that appli
e
s
.
Review Column 2 and incorporate all of the corrspofIdiiig applicable BMPs in your SUSMP
D
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s
.
Review Columns 3 and 4 and incorporate all of the corresponding applicable permanent contr
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PDP's, in your S\X/MP, use the format shown in Table 3-1. In the S\VMP, describe your specific BMPs in an accompanying narrative, and explain any special conditions or situations that required omitting BMPs or substituting alternatives.
IF THESE SOURCES
WILL BE ON THE
PROJECT SITE
...THEN YOUR PROJECT SHOULD INCLUDE THESE SOURCE CONTROL BMPs
1 2 - 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in SWMP Operational BMPs—Include in Runoff Pollutants SUSMP Drawings Table and Narrative SWMP Table and Narrative
A. On-site storm drain Locations of inlets. Mark all inlets with the words "No Maintain and periodically repaint or inlets Dumping! Flows to Bay" or similar, replace inlet markings.
Provide storniwater pollution
prevention information to new Site
owners, lessees, or operators.
applicable operational BMPs in
Fact Sheet SC-44, "Drainage System
Maintenance," in the CASQA
Sturmwater Quality Handbooks at
ur%vw.cabii-iph,ti-i(fbooks.coji-i
Include the following in lease
agreements: "Tenant shall not allow
anyone to discharge anything to
storm drains or to store or deposit
materials so as to create a potential
discharge to storm drains."
Page 1 of 9
U B. interior floor drains U State that interior floor drains and U inspect and maintain drains to and elevator shaft sump elevator shaft sump pumps will be prevent blockages and overflow. pumps plumbed to sanitary sewer.
U C. interior parking U State that parking garage floor drains U Inspect and maintain drains to garages will be plumbed to the sanitary sewer, prevent blockages and overflow.
U Dl. Need for future U Note building design features that U Provide Integrated Pest Management indoor & structural pest discourage entry of pests. information to owners, lessees, and control operators.
D2. Landscape! Show locations of native trees or State that final landscape plans will Maintain landscaping using Outdoor Pesticide Use areas of shrubs and ground cover to accomplish all of the following, minimum or no pesticides. be undisturbed and retained. / Preserve / F' existing native trees, shrubs, See applicable operational BMPs in Show self-retaining landscape and ground cover to the maximum "Building Fact Sheet SC-41, and areas, if any. extent possible. Grounds Maintenance," in the
CASQA Stormwater Quality U' If a PDP, show stormwater Design landscaping to minimize Handbooks at treatment facilities, irrigation and runoff, to promote vw.cabmpharidhooks.com surface infiltration where appropriate, ,/
and to minimize the use of fertilizers E3 Provide IPM information to new
and pesticides that can contribute to owners, lessees and operators.
stormwater pollution.
/ Where landscaped areas are used to
retain or detain stormwater, specify
plants that are tolerant of saturated
soil 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 movement, ecological
consistency, and plant interactions.
U E. Pools, spas, ponds, U Show location of water feature and U If the local municipality requires pools U See applicable operational BMPs in decorative fountains, a sanitary sewer cleanout in an to be plumbed to the sanitary sewer, Fact Sheet SC-72, "Fountain and and other water accessible area within 10 feet. place a note on the plans and state in Pool Maintenance," in the CASQA features. the narrative that this connection will Stormwater Quality Handbooks at
be made according to local www.cabmphandbt±iks.com requirements.
Page 2 of 9
Ll F. Food service Ll For restaurants, grocery stores, and
other food service operations, show
location (indoors or in a covered
area outdoors) of a floor sink or
other area for cleaning floor mats,
containers, and equipment.
U On the drawing, show a note that
this drain will be connected to a
grease interceptor before
discharging to the sanitary sewer
U Describe the location and features of
the designated cleaning area.
U Describe the items to be cleaned in
this facility and how it has been sized
to insure that the largest items can be
accommodated.
U
G. Refuse areas Show where site refuse and State how site refuse will be handled State how the following will be recycled materials will be handled and provide supporting detail to what implemented: and stored for pickup. See city is shown on plans.
standard drawing GS-16. Provide adequate number of
' State that signs will be posted on or tecuptacles. Inspect receptacles / If dumpsters or other receptacles near dumpsters with the words "Do regularly; repair or replace leaky are outdoors, show how the not dump hazardous materials here" receptacles. Keep receptacles designated area will be covered, or similar.
. covered. Prohibit/prevent dumping graded, and paved to prevent run- of liquid or hazardous wastes. Post on and show locations of berms to "no hazardous materials" signs. prevent runoff from the area. Inspect and pick up litter daily and
clean up spills immediately. Keep / Any drains from dumpsters, spill control materials available on- compactors, and tallow bin areas site. See Fact Sheet SC-34, "Waste shall be connected to a grease Handling and Disposal" in the removal device before discharge to CASQA Stormwater Quality sanitary sewer. Handbooks at
www.cabinphandhooks.com
U H. Industrial processes. U Show process area. U If industrial processes are to be U See Fact Sheet SC-10, "Non-
located on site, state: "All process Stormwater Discharges" in the activities to be performed indoors. No CASQA Stormwater Quality
processes to drain to exterior or to Handbooks at
storm drain system." www.cabmphandbooks.com
Page 3 of 9
U I. Outdoor storage of U Show any outdoor storage areas, U include a detailed description of U See the Fact Sheets SC-31, "Outdoor equipment or materials, including how materials will be materials to be stored, storage areas, Liquid Container Storage" and SC- (See rows J and K for covered. Show how areas will be and structural features to prevent 33, "Outdoor Storage of Raw source control graded and bermed to prevent run- pollutants from entering storm drains. Materials "in the CASQA measures for vehicle on or run-off from area. Stormwater Quality Handbooks at cleaning, repair, and Where appropriate, reference www.cabmphandbooks.com maintenance.) U Storage of non-hazardous liquids documentation of compliance with the
shall be covered by a roof and/or requirements of local Hazardous
drain to the sanitary sewer system, Materials Programs for:
and be contained by berms, dikes,
liners, or vaults. Hazardous Waste Generation
U Storage of hazardous materials and Hazardous Materials Release
wastes must be in compliance with Response and Inventory
the local hazardous materials
ordinance and a Hazardous California Accidental Release
Materials Management Plan for the (CaIARP)
site.
Aboveground Storage Tank
Uniform Fire Code Article 80
Section 103(b) & (c) 1991
Underground Storage Tank
Page !,,of 9
MM M MMM M M
J. Vehicle and U Show on drawings as appropriate: U If a car wash area is not provided, Describe operational measures to Equipment Cleaning describe measures taken to discourage implement the following (if Commercial /industrial facilities on-site car washing and explain how applicable): having vehicle /equipment these will be enforced. cleaning needs shall either provide U Washwater from vehicle and a covered, bermed area for washing equipment washing operations shall activities or discourage not be discharged to the storm drain vehicle /equipment washing by system. removing hose bibs and installing
signs prohibiting such uses. U Car dealerships and similar may
rinse cars with water only. Multi-dwelling complexes shall
have a paved, bermed, and covered U Sec Fact Sheet SC-21, "Vehicle and car wash area (unless car washing Equipment Cleaning," in the CASQA is prohibited on-site and hoses are Stormwater Quality Handbooks at provided with an automatic shut-
off to discourage such use).
Washing areas for cars, vehicles,
and equipment shall be paved,
designed to prevent run-on to or
runoff from the area, and plumbed
to drain to the sanitary sewes.
Commercial car wash facilities
shall be designed such that no
runoff from the facility is
discharged to the storm drain
system. Wastewater from the
facility shall discharge to the
sanitary sewer, or a wastewater
reclamation system shall be
installed.
Page 5 of 9
U K. Vehicle /Equipment U Accommodate all vehicle U State that no vehicle repair or In the SUSMP report, note that all of Repair and equipment repair and maintenance maintenance will be done outdoors, or the following restrictions apply to use Maintenance indoors. Or designate an outdoor else describe the required features of the site: work area and design the area to the outdoor work area.
prevent run-on and runoff of U No person shall dispose of, nor stormwater. U State that there are no floor drains or if permit the disposal, directly or
there are floor drains, note the agency indirectly of vehicle fluids, hazardous U Show secondary containment for from which an industrial waste materials, or rinsewatr from parts exterior work areas where motor - discharge permit will be obtained and cleaning into storm drains. oil, brake fluid, gasoline, diesel that the design meets that agency's
fuel, radiator fluid, acid-containing requirements. No vehicle fluid removal shall be
batteries or other hazardous performed outside a building, nor on
materials or hazardous wastes are U State that there are no tanks, U asphalt or ground surfaces, whether used or stored. Drains shall not be containers or sinks to be used for parts inside or outside a building, except installed within the secondary cleaning or rinsing or, if there are, note in such a manner as to ensure that
containment areas. the agency from which an industrial any spilled fluid will be in an area of
waste discharge permit will be secondary containment. Leaking U Add a note on the plans that States obtained and that the design meets vehicle fluids shall be contained or either (1) there are no floor drains, that agency's requirements. drained from the vehicle or (2) floor drains are connected to immediately. wastewater pretreatment systems
prior to discharge to the sanitary No person shall leave unattended
sewer and an industrial waste drip parts or other OCfl containers discharge permit will be obtained. U containing vehicle fluid, unless such
containers are in use or in an area of
secondary containment.
Page 6 of 9
O L. Fuel Dispensing U Fueling areas1 shall have U The property owner shall dry sweep Areas impermeable floors (i.e., portland the fueling area routinely. cement concrete or equivalent
smooth impervious surface) that U See the Business Guide Sheet, are: a) graded at the minimum "Automotive Service—Service slope necessary to prevent ponding; Stations" in the CASQA Stormwater and b) separated from the rest of Quality Handbooks at the site by a grade break that wv.cabmphandbooks.com prevents run-on of stormwater to
the maximum extent practicable.
Fueling areas shall be covered by a
canopy that extends a minimum of U ten feet in each direction from each
pump. [Alternative: The fueling
area must be covered and the
cover's minimum dimensions must
be equal to or greater than the area
within the grade break or fuel
dispensing area'.] The canopy for
cover] shall not drain onto the
fueling area.
The fueling area shall be defined as the area extending a II6nirnwl1 of 6.5 feet front the corner of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minintuin ofone foot, whichever is greater.
Page 7 of 9
U M. Loading Docks U Show a preliminary design for the U Move loaded and unloaded items
loading dock area, including indoors as soon as possible.
roofing and drainage. Loading
docks shall be covered and/or U See Fact Sheet SC-30, "Outdoor
graded to minimize run-on to and Loading and Unloading," in the
runoff from the loading area. Roof CASQA Stormwater Quality
downspouts shall be positioned to Handbooks at
direct stormwater away from the v.cabmphandbooks.com
loading area. Water from loading
dock areas should be drained to the
sanitary sewer where feasible.
Direct connections to storm drains
from depressed loading docks are
prohibited.
U Loading dock areas draining
directly to the sanitary sewer shall
be equipped with a spill control
valve or equivalent device, which
shall be kept closed during periods
of operation.
Provide a roof overhang over the
U loading area or install door skirts
(cowling) at each bay that enclose
the end of the trailer.
U N. Fire Sprinkler Test U Provide a means to drain fire sprinkler U See the note in Fact Sheet SC-41, Water test water to the sanitary sewer. "Building and Grounds
Maintenance," in the CASQA
Stormwater Quality Handbooks at
www.cabmphandbooks.com
Page 8 of 9
- - -
0. Miscellaneous Drain U Boiler drain lines shall be directly or
or Wash Water indirectly connected to the sanitary
sewer system and may not discharge
U Boiler drain lines to the storm drain system.
U Condensate drain lines U Condensate drain lines may discharge
to landscaped areas if the flow is small
U Rooftop equipment enough that runoff will not occur.
Condensate drain lines may not U Drainage sumps discharge to the storm drain system.
-
Roofing, gutters, and Rooftop mounted equipment with
trim, potential to produce pollutants shall
U be roofed and/or have secondary
containment.
Any drainage sumps on-site shall
- feature a sediment sump to reduce the
quantity of sediment in pumped water. U
Avoid roofing, gutters, and trim made
of copper or other unprotected metals
that may leach into runoff.
P. Plazas, sidewalks, as, sidewalks, and parking lots and parking lots, shall be swept regularly to prevent
the accumulation of litter and debris.
Debris from pressure washing shall
be collected to prevent entry into the
storm drain system. Washwater
containing any cleaning agent or
degreaser shall be collected and
discharged to the sanitary sewer and
not discharged to a storm drain.
Page 9 of 9
Attachment
9
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SECTION 2: IDENTIFY POLLUTANTS, BMP SI
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FIGURE 2-2. Mitigaon Criteria and Implementation I
38 City of Carlsbad SUSMP - January 14, 2011
SECTION 2: IDENTIFY POLLUTANTS, BMP
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FIGURE 2-3. Midgaon Criteria and Implementation II
40 City of Carlsbad SUSMP - January 14, 2011
Attachment
10
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Attachment
11
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Report Result Page 1 of
Project Summary
Project Name Encinas Creek Multi-Family (Holly Springs)
Project Applicant Holly Springs
Jurisdiction City of Carlsbad
Parcel (APN) 168-050, 58, 59
Hydrologic Unit Carlsbad
Compliance Basin Summary
Basin Name: Basin 1
Receiving Water: SD at College & 'C' Street
Rainfall Basin Oceanside
Mean Annual Precipitation (inches) 13.3
Project Basin Area (acres): 7.19
Watershed Area (acres): 0.00
SCCWRP Lateral Channel Susceptiblity (H, M, L):
SCCWRP Vertifical Channel Susceptiblity (H, M, L):
Overall Channel Susceptibility (H, M, L): HIGH
Lower Flow Threshold (% of 2-Year Flow): 0.1
Drainage Management Area Summary
ID Type BMP ID Description Area (ac) Pre-Project Cover Post Surface Type Drainage Soil Slope
21861 Drains to LID BMP 1 DMA 1 0.82 Pervious (Pie) Concrete or asphalt Type D (high runoff- clay
soi... Steep (greater 10%)
21863 Drains to LID BMP 1 DMA 1A 0.08 Pervious (Pm) Pervious concrete or asphalt Type B (high runoff - clay
soi... Steep (greater 10%)
21864 Drains to LID BMP 1 DMA 1 B 0.13 Pervious (Pre) Pervious concrete or asphalt Type D (high runoff - clay
soi... Steep (greater 10%)
21865 Drains to LID BMP 1 DMA 1C 0.04 Pervious (Pre) Landscaping Type D (high runoff- clay
soi... Steep (greater 10%)
22086 Drains to LID BMP 2 DMA 2 0.2 Pervious (Pre) Concrete or asphalt Type D (high runoff - clay
501... Steep (greater 10%)
22087 Drains to LID BMP 2 DMA 2A 0.01 Pervious (Pre) Landscaping Type D (high runoff- clay
soi... Steep (greater 10%)
htfn//iilnnw hrwnr,1d crv7rdrz1 'Rf1 7R,h =fl('..nnn1 c=in 11 /7/1)1) 11
Report Result Page 2 of 3
22086 Drains to LID BMP 3 DMA 3 0.17 Pervious (Pre) Roofs Type D (high runoff- clay Steep (greater 10%) So'...
22089 Drains to LID BMP 3 DMA 3A 0.18 Pervious (Pre) Landscaping Type (high runoff- clay Steep (greater 10%) soi...
22090 Drains to LID BMP 3 DMA 3B 0.19 Pervious (Pre) Concrete or asphalt Type D (high runoff- clay Steep (greater 10%) so'...
22093 Drains to LID BMP 4 DMA 4 0.27 Pervious (Pie) Concrete or asphalt Type D (high runoff- clay Steep (greater 10%) so'...
22094 Drains to LID BMP 4 DMA 4A 0.04 Pervious (Pre) Pervious concrete or asphalt Type D (high runoff - clay Steep (greater 10%) soi...
22095 Drains to LID BMP 5 DMA 5 0.16 Pervious (Pre) Concrete or asphalt Type D (high runoff - clay Steep (greater 10%) soi...
22096 Drains to LID BMP 5 DMA 5A 0.06 Pervious (Pre) Pervious concrete or asphalt Type D (high runoff - clay Steep (greater 10%) so'...
22099 Drains to LID BMP 6 DMA 6 0.1 Pervious (Pre) Concrete or asphalt Type 0 (high runoff - clay Steep (greater 10%) soi...
22100 Drains to LID BMP 6 DMA 6A 0.3 Pervious (Pre) Concrete or asphalt * Type D (high runoff- clay Steep (greater 10%) soi...
22101 Drains to LID BMP 6 DMA 6B 0.08 Pervious (Pre) Pervious concrete or asphalt Type D (high runoff - clay Steep (greater 10%) so'...
22102 Drains to LID BMP 6 DMA 6C 0.07 Pervious (Pre) Pervious concrete or asphalt Type D (high runoff- clay Steep (greater 10%) so'...
22103 Drains to LID BMP 6 DMA 60 0.00 Pervious (Pre) Pervious concrete or asphalt Type 0 (high runoff- clay Steep (greater 10%) soi...
22110 Drains to LID BMP 7 DMA 7 0.14 Pervious (Pre) Roofs Type D (high runoff- clay Steep (greater 10%) soi...
22111 Drains to LID BMP 7 DMA 7A 0.11 Pervious (Pre) Landscaping Type D (high runoff- clay Steep (greater 10%) soi...
22117 Drains to LID BMP 8 DMA 8 0.19 Pervious (Pre) Roofs Type (high runoff- clay Steep (greater 10%) soi...
22118 Drains to LID BMP 8 DMA 8A 0.1 Pervious (Pre) Landscaping Type D (high runoff- clay Steep (greater 10%) so'...
22119 Drains to LID BMP 8 DMA SB 0.17 Pervious (Pre) Roofs Type (high runoff- clay Steep (greater 10%) 501...
22120 Drains to LID BMP 8 DMA 8C 0.06 Pervious (Pre) Landscaping Type D (high runoff - clay Steep (greater 10%) So'...
22121 Drains to LID BMP 8 DMA SD 0,04 Pervious (Pre) Concrete or asphalt Type D (high runoff- clay Steep (greater 10%) soi...
22124 Drains to LID BMP 9 DMA 9 0.14 Pervious (Pre) Roofs Type (high runoff- clay Steep (greater 10%) SO'...
hftrr //11l.ncw hrurnP21d ('rim 1Ict'TririUrt/T? ii-rirfP PQ111f 0 v9iA= 1 2( 1 rfl(1_(WlA 1 -Q,c=f, 11 IlK) fl 1')
- - - - - = Report Result Page 3 of
22126 Drains to LID BMP 10 DMA 10 0.06 Pervious (Pre) Roofs Type D (high runoff- clay Steep (greater 10%) soi...
22127 Drains to LID BMP 10 DMA 10A 0.1 Pervious (Pre) Concrete or asphalt Type D (high runoff- clay Steep (greater 10%) soi...
22128 Drains to LID BMP 10 DMA 108 0.04 Pervious (Pre) Landscaping Type D (high runoff- clay Steep (greater 10%) soi...
22130 Drains to LID BMP 11 DMA 11 0.26 Pei viuus (Pre) eoncrete or asphalt Type D (high runott - clay Steep (greater 10%) soi...
22132 Self-Retaining BMP 12 DMA 12 0.22 Type D (high runoff- clay
soi...
LID Facility Summary
BMP ID Type Description Plan Area (sqft) Volume 1(cft) Volume 2(cft) Orifice Flow (cfs) Orifice Size (inch)
BMP 1 Bioretention + Vault Lined Bioretention w Vault 1472 5889 0.00 0.026 0.7
BMP 2 Bioretention + Vault Lined Bioretention w Vault 350 1400 0.00 0.005 0.3
BMP 3 Bioretention + Vault Lined Bioretention w Vault 658 2634 0.00 0.013 0.5
BMP 4 Bioretention + Vault Lined Bioretention w Vault 477 1909 0.00 0.007 0.3
BMP 5 Bioretention + Vault Lined Bioretention w Vault 289 1156 0.00 0.005 0.3
BMP 6 Bioretention + Vault Lined Bioretention w Vault 723 2892 0.00 0.013 0.5
BMP 7 Bioretention + Vault Lined Bioretention w Vault 263 1052 0.00 0.006 0.3
BMP 8 Bioretention + Vault Lined Bioretention w Vault 724 2899 0.00 0.013 0.5
BMP 9 Bioretention + Vault Lined Bioretention w Vault 243 975 0.00 0.003 0.2
BMP 10 Bioretention + Vault Lined Bioretention w Vault 285 1143 0.00 0.004 0.3
BMP 11 Bioretention + Vault Lined Bioretention w Vault 453 1812 0.00 0.006 0.3
BMP 12 Self-Treating
.7771
0.00 0.00 0.00 0.00 0.00
httri /Iiiknrrxr hrxmpilt1 orNm I ftTtwJ1tf/P ,rrrtP Peiilf crv9tm1= 1 2i 1 1 T'('M00 1 11 17/)All )
Attachment
12
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tis?al ter Management for Life
n •-•1 .:.•
TT _____________________
.......................
..-. .I
. I .
I
Benefits
Quick Installation
- Reduce site access delays
Lightweight
- No cranes or lifting equipment
required.
Strong Structural Design
- Designed for car loadings up to
26.8 t/fl2
Modular
- Easily create any shape and size to
sait site 'equirements.
Maintenance Free Tank
All debris and sediment is removed
by pre-filtration.
Determinate Volume
- One :ubic metre of Matrix® Tank
Modules contain 950 litres of water.
Cost Effective
- Redu:es excavation and disposal
by two thirds compared with
conventional soak wells.
- Cost effective compared to
concrete and other systems
High rnfiftration
90% Void surface area
Easily Transportable - Can be supplied unassembled for
Underground
Modular Water Tanks
for underground Infiltration, Detention, Rainwater Harvesting & Channel applications...
Total Stormwater Management
Atantis® Modular tank systems use surface and underground
infiltration techniques, resulting in clean water that can be
re-used or allowed to re-enter the natural wafer system.
At!antis® modular tank systems offer a highly efficient option
for stormwater management in any kind o scil.
Water Quality
Abantis® modular tank systems excel when there is a requirement
to achieve high water quality particularly in tbe effective removal
of nutrients and gross pollutants. In addition to the obvious
environmental benefits, the sub -surface location or the tank system
provides more useable ground area and enhanced aesthetic
setting compared to above g.ound concrete or alastic tanks.
The Modular Advantage
At antis® Modular Tank System performance supersedes outdated
aggregate trenches. The Atlantis® system provides a void space
of over 90% compared to less than 20% in typical aggegate
trenches. Consequently, with a smaller footprint :he Atlantis®
system achieves the same sto-age capacity as an aggregate
trench. This saves time and money in installation and civil works
costs. The lightweight design of Atlantis® modular tank module---
also make installation quicker, safer and cheaper No sediment
build up occurs in the Atlantis® system, unlike :he clogging
that is characteristic of aggregate based approaches.
The trash s:rnn cc ecrs au iSS
poIlutans and micro noHu:anrs as
small as 180 microns.
I freate any Shape or Size
Important Design Information
Safety Factors:
Engineers, designers and geotechnical
engineers shoulc design and calculate E K
safety factors to serviceable limited state E
co
to suit specific project In case of doubt,
consult your nearest distributor or Atlantis.
450nm At
Tank Module Orientation:
Matrix® :ank modules must be installed E with correct orientation to ensure E __________ 0 maximum load bearing capacity. Ln
40&im
Depth Requiremen:s for Cover Materials:
Loading Minimum Cover
Pedestrian 300mm
Occasional Traffic 500mm
Note: Cover materials must be compacted at 300mm intervals.
Atlantis® Filtration Units I
Atlantis Filtration Unit 450mm Ini.t pip
A pre-filter system speciEcally
designe to capture gross
pollutants, dissolved solids and 480 oti.' pp. MITI silt from roofs and stormwater ==[I
surface pits allowrg clean water AtiantisOD Small Filtration Unit
to enter the Atlants® system.
I
680mm
II
IflIO l:m
50
880
ITIM
,Outlet pipe
Aflanti-0 Lamp Filtr;finn Unit
Use Strength with
Intelligence...
Design our tank rroøules
to suit your budget & load
requirements.
3 Plate
Strength: 15.6 1/M2 (22.19 PSI)
4 Plate
Strength: 26.8 1/rn2 (33.12 PSI)
5 Plate
Strength: 38 t/m2 54 04 PSI)
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