HomeMy WebLinkAboutCUP 10-08; La Posada de Guadalupe de Carlsbad; Conditional Use Permit (CUP) (4)•
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Preliminary Stormwater Management Plan
(SWMP)
La Posada Men's Shelter
Preparation Date: 01-12-2011
Rev.04/04/11
Prepared for:
Catholic Charities
349 Cedar Street
San Diego, CA 92101
Prepared by:
Felix Gonzalez, Senior Project Manager
Civil Engineering
Ware Malcomb
10 Edelman Irvine, CA 92618
(949) 660-9128
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Pro· ect Name:
Pro· ect Location:
Permit Number
Plan Prepared By (Leave blank if same as
a lican :
Date:
Revision History:
Project Stages
Andrew Dzuzlinsk
10 Edelman, Irvine, CA
Felix Gonzalez
10 Edelman, Irvine, CA 92618
Rev. 04/04111
Does the SWMP
need revisions?
YES NO
IfYES, Provide
Revision Date
Completion of the following checklists and attachments will fulfill the requirements of a
Major SWMP for the project listed above .
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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
To address post-development pollutants that may be generated from development projects, the City requires that new
development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management
Practices (BMP's) into the project design per the City's Standard Urban Stormwater Management Plan (SUSMP). To
view the SUSMP, refer to the Engineering Standards (Volume 4, Chapter 2) at www.carlsbadca.gov/standards.
Initially this questionnaire must be completed by the applicant in advance of submitting for a development application
(subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of
storm water standards that must be applied to a proposed development or redevelopment project. Depending on the
outcome, your project will either be subject to 'Standard Stormwater Requirements' or be subject to additional criteria
called 'Priority Development Project Requirements'. Many aspects of project site design are dependent upon the
storm water standards applied to a project.
Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts.
City staff has responsibility for making the final assessment after submission of the development application. If staff
determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than
initially assessed by you, this will result in the return of the development application as incomplete. In this case, please
make the changes to the questionnaire and resubmit to the City.
If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the
questions, please seek assistance from Land Development Engineering staff.
A separate completed and signed questionnaire must be submitted for each new development application submission.
Only one completed and signed questionnaire is required when multiple development applications for the same project
are submitted concurrently. In addition to this questionnaire, you must also complete, sign and submit a Project Threat
Assessment Form with construction permits for the project.
Please start by completing Section 1 and follow the instructions. When completed, sign the form at the end and submit
this with your application to the city.
Examples: single family homes, multi-family homes,
Commercial-gf811ter 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; buildings; car wash facilities; mini-malls and other business complexes; shopping malls;
automotive and other industrial facilities.
Heavy Industrial/ Industry-pt88ter than 1 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,
5014, 5541, 7532-7534, and 7536-7539
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
and
E-34 Page 1 of3 REV 1/14/11
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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
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 (ESAJ 1• All development located within or directly adjacent" 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 prolect 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 OuUets. Serving more than 100 vehicles per day and greater than 5,000 square feet
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• .. .. 1 Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) 1mpa1red water bod1es, 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 Copennittees.
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, 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 follow the instructions .
E-34 Page 2 of3 REV 1/14/11
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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
·sECT!q~·2 sio~ti=lcANT RE'oEVJ:u)PMeNT ..
INSTRUCTIONS: Complete the questions below regarding your project YES I NO
1 . Project results in the disturbance of 1-acre or more of land and is considered a Pollutant -generating Development Vi 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) l~i
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 lv~ parking lots and existing roadways; new sidewalk; bike lane on existing road and/or routine maintenance of damaged
pavement such as pothole repair? Resurfacing/reconftgurlng parking lots is where the work does not expose underlying soil
during construction. I
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 I developed property or will your project be located within 200 feet of the Pacific Ocean and ( 1) create 2500 square feet or Vi 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.
D
.. *for defi01t1on see Footnote 4 on page 2
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 (hydromodlfication) 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 art of these r uirements, I will incor rate low im act develo ment strate ies throu hout m ro·ect.
Applicant Information and Signature Box This Box fOr City Use Only
Assessor's Parcel Number(s):
zo-r-City Concurrence: I YES I NO
I I By:
Dale:
Project 10:
E-34 Page 3 of 3 REV 1/14/11
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PROJECT SETTING
Total Project Site Area 1.219 Acres(Acres or ft2)
Estimated amount of disturbed acreage: 1.01 Acres (Acres or ft2)
(If >1 acre, you must also provide a WDID number from the SWRCB) WDID: Pending
Complete A through C and the calculations below to determine the amount of impervious
surface on your project before and after construction.
A. Total size of project site: 1.219 (Acres or fe)
B. Total impervious area (including roof tops) before construction 0.316 (Acres or fe)
C. Total impervious area (including roof tops) after construction 0.418 (Acres or ft~
Calculate percent impervious before construction: B/ A= 25.9 %
Calculate percent impervious after construction: C/ A = 39.46%
Project Site Address: 2478 Impala Drive, Carlsbad, CA 92008
APN Number(s): 209-041-28
Zoning: M-Q Industrial
Land Use: Shelter Facility
Project Watershed: Carlsbad Watershed (Hydrologic Unit No. 904.00)
Sub~ Watershed: Agua Hedionda Creek Watershed (Hydrologic Area 904.30)
Soil Type: D (See Attached Soil Hydrology Groups)
Project Description
This Stormwater Management Plan (SWMP) is being prepared by Ware Malcomb for Catholic
Charities who is developing the La Posada Men's shelter at 2478 Impala Drive, Carlsbad, CA
92008. It sits north of Impala Drive and bounded to the west by Palmer Way and east by Orion St.
Existing parking and building structures and improvements at the property are planned for
demolition to allow for constructions of a new men's shelter facility and the associated structures
and improvements.
Existing structures and improvements will be demolished and a new facility consisting of two large
dormitory-type buildings and administrative office will be constructed. Associated improvements
are expected to consist of surface and paving improvements and underground utilities. All planned
new buildings will maintain a minimum 20-foot setback from the top of nearby descending slopes.
Significant grade alterations are not anticipated over the majority of the property and finish grades
are expected to be at or very near the existing surfaces. Some minor cutting and filling are locally
anticipated to achieve fine pad grades with deeper cuts .
Refer to Appendix B for Vicinity Map and Site Plan.
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TEMPORARY CONSTRUCTION BMPS
Please check the construction BMPs that may be implemented during construction of the
project. The applicant will be responsible for the placement and maintenance of the BMPs
incorporated into the final project design.
[2JSilt Fence
~Basin Fiber Rolls
~Street Sweeping and Vacuuming
~Storm Drain Inlet Protection
~Stockpile Management
0Solid Waste Management
~Stabilized Construction Entrance/Exit
~Dewatering Operations
~Vehicle and Equipment Maintenance
0Desilting
~Gravel Bag Berm
~Sandbag Barrier
~Material Delivery and Storage
~Spill Prevention and Control
~Concrete Waste Management
~Water Conservation Practices
~Paving and Grinding Operations
Any minor slopes created incidental to construction and not subject to a major or minor
grading permit shall be protected by covering with plastic or tarp prior to a rain event,
and shall have vegetative cover reestablished within 180 days of completion of the slope
and prior to final building approval.
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IDENTIFY CONSTRAINTS AND OPPORTUNITIES:
CONSTRAINTS: The project property is generally under Type D soil which have very low
porosity and is very difficult to excavate. However, significant cutting into the bedrock is not
planned. There is also a very steeply descending natural slopes at the northern portion of the
property. The slopes descend more than 250 feet, at gradients approaching 1:1 maximum, into
Agua Hedionda Creek below. The west property is also marked by a graded cut embankment
that descends at 2:1 gradients approximately 20 feet to a developed commercial lot below.
OPPORTUNITES: Geologic hazards are not presently indicated at the project site per the
Geotechnical Investigation report by Vinje & Middleton Engineering, Inc. under Job # 09-
224-P. It states that the nearby natural and graded slopes are underlain by massive hard and
competent crystalline bedrock. Thus gross geologic instability or hazards due to landslides,
faults, unstable natural hillside terrain or graded embankments are not present at the project
property. The project site is also considered non-corrosive and has no contaminated or
hazardous soils within the area. There is approximately 20 feet difference in elevation from
the north-east portion of the property and the south-west point which can give good amount
of hydraulic head .
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SPECIFY SOURCE CONTROL BMPs
TABLE 3-1: TABLE FOR PERMANENT AND OPERATIONAL SOURCE
CONTROL MEASURES
Potential source of Permanent Operational
runoff pollutants source control BMPs source control BMPs
[on-Site Storm Drain See plan for locations nlets to be marked "No Dumping
~nlet Drains to Ocean"
Property Owner will enter into an
Operation & Maintenance Agreement
!Landscape/Outdoor Self treating areas and !Landscape is designed to minimize
!Pesticide Use stormwater treatement ~noff and irrigation, detain
facilities shown on stormwater, planting has been selected
!Attachment B or pest control, and appropriate
planting has been selected for
~cosystem
!Food Service !Grease Interceptor is Kitchen is main cleaning area
shown on Attachment B
!Refuse areas Show where site State how site refuse will be
refuse and recycled handled and provide supporting
materials will be detail to what is shown on plans.
handled and stored
for pickup. See local State that signs will be posted on or
municipal near dumpsters with the words "Do not
requirements for ~ump hazardous materials here" or
sizes and other ~imilar.
details of refuse
areas.
If dumpsters or other
receptacles are
outdoors, show how
the designated area
will be covered,
graded, and paved to
prevent run-on and
show locations of
berms to prevent
runoff from the area .
!Any drains from
!dumpsters, compactors,
land tallow bin areas
shall be connected to a
!grease removal device
[before discharge to
sanitary sewer.
!Fire Sprinkler Test !Provide a means to See the note in Fact Sheet SC-41,
~ater ldrain fire sprinkler test "Building and Grounds Maintenance,"
!water to the sanitary · n the CASQA Stormwater Quality
sewer. !Handbooks at
www .cabmohandbooks.com
Plazas, sidewalks, !Plazas, sidewalks, and parking lots and parking Jots. shall be swept regularly to prevent
he accumulation of litter and
!debris.
!Debris from pressure washing shall be
!collected to prevent entry into the
storm drain system. Wash water -!containing any cleaning agent or
jdegreaser shall be collected and
jdischarged to the sanitary sewer and
!£lot discharged to a storm drain
IMisc. Drains:
Roofing, gutters and Roof mounted equipment See the note in the Fact Sheet SC-41
rim ~ith potential to produce 'Building and Grounds Maintenance"
!Pollutants shall be roofed ·n the CASQA Stormwater Quality
land/or have secondary !Handbooks at
~ontainment. twww .cabmphandbooks.com
tondensate drain lines
may discharge to
landscaped areas if the
!flow is small enough that
!runoff will not occur.
\Condensate drain lines
~ay not discharge to the
storm drain system.
lA void roofing, gutters,
land trim made of cupper
lor other unprotected
metals that may leach into
runoff.
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PROJECT ANTICIPATED AND POTENTIAL POLLUTANTS • Using Table 2-1, identify pollutants that are anticipated to be generated from the proposed
priority project categories. Pollutants associated with any hazardous material sites that have
been remediated or are not threatened by the proposed project are not considered a
pollutant of concern.
TABLE 2·1: ANTICIPATED AND POTENTIAL POLLUTANTS GENERATED BY
LAND USE TYPE
General Pollutant Categories
PDP Oxygen Bacteria
Categories Sediments Nutrients Heavy Organic Trash & Demanding Oil & & Metals Compounds Debris Substances Grease Viruses
Detached X X X X X X Residential
Development
Attached X X X p(l) p(L) p
Residential
Ot _,
llt:UL
Commercial p(IJ p(IJ p(L) X pPJ X p(J)
Development 1
acre or greater
Heavy industry X X X X X X /industrial
development
Automotive X x(4)(:>) X X
Repair Shops
Restaurants X X X X
Hillside X X X X X Development
>5,000 ft2
Parking Lots p(IJ p(IJ X X p(l) X
Retail n,.~nlin,. X X X X X Outlets
Streets, Highways X p(IJ X (4) X pPJ X
& Freeways
X = anticipated
P = potential
( 1) A potential pollutant if landscaping exists on-site.
(2) A potential pollutant if the project includes uncovered parking areas.
(3) A potential pollutant if land use involves food or animal waste products.
(4) Including petroleum hydrocarbons.
(5) Including solvents .
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Pesticides
X
X
pPJ
X
p(IJ
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PROJECT POLLUTANTS OF CONCERN SUMMARY
TABLE
Please summarize the identified project pollutant of concern by checking the appropriate
boxes in the table below and list any surface water impairments identified. Pollutants
anticipated to be generated by the project, which are also causing impairment of
receiving waters, shall be considered the primary pollutants of concern.For projects
where no primary pollutants of concern exist, those pollutants identified as
. anticipated shall be considered secondary pollutants of concern.
TABLE 7: PROJECT POLLUTANTS OF
CONCERN
Pollutant Category Anticipated Potential Surface Water Impairments (X) (P)
Sediments X
Nutrients X
Heavy Metals
Organic Compounds X
Trash & Debris X
Oxygen Demanding
Substances
Oil & Grease X
Bacteria & Viruses X
Pesticides X
POLLUTANTS OF CONCERN
The expected or potential Urban Runoff Pollutants of concern are:
• Metals -The primary source of metal pollution in Urban Runoff is typically commercially
available metals and metal products. Metals of concern include cadmium, chromium, copper, lead,
mercury, and zinc. Lead and chromium have been used as corrosion inhibitors in primer coatings
and cooling tower systems. Metals are also raw material components in non-metal products such
as fuels, adhesives, paints, and other coatings. At low concentrations naturally occurring in soil,
metals may not be toxic. However, at higher concentrations, certain metals can be toxic to aquatic
life. Humans can be impacted from contaminated groundwater resources, and bioaccumulation of
metals in fish and shellfish. Environmental concerns, regarding the potential for release of metals
to the environment, have already led to restricted metal usage in certain applications.
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• Nutrients-Nutrients are inorganic substances, such as nitrogen and phosphorus. They
commonly exist in the form of mineral salts that are either dissolved or suspended in
water. Primary sources of nutrients in Urban Runoff are fertilizers and eroded soils.
Excessive discharge of nutrients to water bodies and streams can cause excessive aquatic
algae and plant growth. Such excessive production, referred to as cultural eutrophication,
may lead to excessive decay of organic matter in the water body, loss of oxygen in the
water, release of toxins in sediment, and the eventual death of aquatic organisms.
• Organic Compounds-Organic compounds are carbon-based. Commercially available
or naturally occurring organic compounds are found in pesticides, solvents, and
hydrocarbons. Organic compounds can, at certain concentrations, indirectly or directly
constitute a hazard to life or health. When rinsing off objects, toxic levels of solvents and
cleaning compounds can be discharged to the MS4. Dirt, grease, and grime retained in the
cleaning fluid or rinse water may also adsorb levels of organic compounds that are
harmful or hazardous to aquatic life.
• Sediments-Sediments are soils or other surficial materials eroded and then transported
or deposited by the action of wind, water, ice, or gravity. Sediments can increase turbidity,
clog fish gills, reduce spawning habitat, lower young aquatic organisms survival rates,
smother bottom dwelling organisms, and suppress aquatic vegetation growth.
• Trash and Debris-Trash (such as paper, plastic, polystyrene packing foam, and
aluminum materials) and biodegradable organic matter (such as leaves, grass cuttings, and
food waste) are general waste products on the landscape. The presence of trash and debris
may have a significant impact on the recreational value of a water body and aquatic
habitat. Excess organic matter can create a high biochemical oxygen demand in a stream
and thereby lower its water quality. In addition, in areas where stagnant water exists, the
presence of excess organic matter can promote septic conditions resulting in the growth
of undesirable organisms and the release of odorous and hazardous compounds such as
hydrogen sulfide.
• Oxygen-Demanding Substances -This category includes biodegradable organic material as
well as chemicals that react with dissolved oxygen in water to form other compounds.
Proteins, carbohydrates, and fats are examples of biodegradable organic compounds.
Compounds such as ammonia and hydrogen sulfide are examples of oxygen-demanding
compounds. The oxygen demand of a substance can lead to depletion of dissolved oxygen in a
water body and possibly the development of septic conditions.
• Oil and Grease -Oil and grease are characterized as high-molecular weight organic
compounds. Primary sources of oil and grease are petroleum hydrocarbon products, motor
products from leaking vehicles, esters, oils, fats, waxes, and high molecular-weight fatty acids.
Introduction of these pollutants to the water bodies are very possible due to the wide uses and
applications of some of these products in municipal, residential, commercial, industrial, and
construction areas. Elevated oil and grease content can decrease the aesthetic value of the
water body, as well as the water quality.
• Pathogens (Bacteria/Virus)-Bacteria and viruses are ubiquitous microorganisms that thrive
under certain environmental conditions. Their proliferation is typically caused by the transport
of animal or human fecal wastes from the watershed. Water, containing excessive bacteria and
viruses can alter the aquatic habitat and create a harmful environment for humans and aquatic
life. Also, the decomposition of excess waste causes increased growth of undesirable
organisms in the water .
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SECTION 2: IDENTIFY POLLUTANTS, BMP SIZING AND SELECTION
14. Hydromodificatlon Con1rols Requhd
Go 10 Figure 2.2 of Doclsion Matrix
FIGURE 2-1. HMP Applicability Determination*
*refer to expanded HMP exemption criteria below for justifications required on each node
30 City of Carlsbad SUSMP -January 14, 2011
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SECTION 2: IDENTIFY POLLUTANTS, BMP SIZING AND SELECTION
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Consult with
Geotechnical Engineer •
Redesign
LIDorBMP
I'EC
FIGURE 2-2. Mitigation Criteria and Implementation I
38 City of Carlsbad SUSMP-January 14, 2011
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HMP APPLICABILITY DETERMINATION:
Based on Figure 2-1: HMP Applicability Determination AND FIGURE 2-2: Mitigation
Criteria and Implementation, the project is subject to flow-control (hydromodification). The project
will increase the impervious area from 0.316 Ac (25.9%) to 0.481 Ac (39.45%). SCCWRP channel
assessment was not conducted. Therefore, the project would be held to the 0.1 Q2 lower flow
threshold. IMP and extended detention facilities must be sized to that the mitigates post project flow
and durations do not exceed pre-project flows and durations for the geomorphically-significant flow
range of0.1Q2 to Q10 .
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LID AND SITE DESIGN STRATEGIES
Each numbered item below is a Low Impact Development (LID) requirement of the WPO.
Please check the box(s) under each number that best describes the LID BMP(s) and Site
Design Strategies selected for this project.
TABLE 8: LID AND SITE DESIGN
1. Conserve natural Areas, Soils, and Vegetation
[gjPreserve well draining soils (Type A or B)
0Preserve Significant Trees
[g!Preserve critical (or problematic) areas such as floodplains, steep slopes, wedands,
and areas with erosive or unstable soil conditions
00ther. Description:
2. Minimize Disturbance to Natural Drainages
[gjSet-back development envelope from drainages
URestrict heavy construction equipment access to planned green/ open
space areas
Oother. Description:
3. Minimize and Disconnect Impervious Surfaces (see 5)
0Clustered Lot Design
0Items checked in 5?
Oother. Description:
4. Minimize Soil Compaction
0Restrict heavy construction equipment access to planned green/ open
space areas
ORe-till soils compacted by construction vehicles/ equipment
0Collect & re-use upper soil layers of development site containing organic
Materials
Other. Description:
5. Drain Runoff from Impervious Surfaces to Pervious Areas
LID Street & Road Desim
0Curb-cuts to landscaping
0Rural Swales
0Concave Median
0Cul-de-sac Landscaping Design
00ther. Description:
LID Parkin{! Lot Desim
0Permeable Pavements
• ~Curb-cuts to landscaping
00ther. Description:
LID Drivewav. Sidewalk Bike-:oath Desiro
0Permeable Pavements
~Pitch pavements toward landscaping
00ther. Description:
LID Buildin!! DesiP11
0Cistems & Rain Barrels
~Downspout to swale
DV egetated Roofs
00ther. Description:
LID Landscaoin!! Desil!ll
0Soil Amendments
~Reuse of Native Soils
~Smart Irrigation Systems
0Street Trees
00ther. Description: • 6 . Minimize erosion from slopes
~Disturb existing slopes only when necessary
0Minirnize cut and fill areas to reduce slope lengths
~Incorporate retaining walls to reduce steepness of slopes or to shorten slopes
0Provide benches or terraces on high cut and fill slopes to reduce concentration
of flows
~Rounding and shaping slopes to reduce concentrated flow
0Collect concentrated flows in stabilized drains and channels
00ther. Description:
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LID AND TREATMENT CONTROL SELECTION
A treatment control BMP and/ or LID facility must be selected to treat the project pollutants
of concern identified in Table 7 "Project Pollutants of Concern". A treatment control
facility with a high or medium pollutant removal efficiency for the project's most significant
pollutant of concern shall be selected. It is recommended to use the design procedure in
Chapter 4 of the SUSMP to meet NPDES permit LID requirements, treatment
requirements, and flow control requirements. If your project does not utilize this approach,
the project will need to demonstrate compliance with LID, treatment and flow control
requirements. Review Chapter 2 "Selection of Stormwater Treatment Facilities" in the
SUSMP to assist in determining the appropriate treatment facility for your project.
Will this project be utilizing the unified LID design procedure as described in Chapter 4 of
the Local SUSMP? (If yes, please document in Attachment D following the steps in Chapter4 of the Counry SUSMP)
Yes I
If this project is not utilizing the unified LID design procedure, please describe how the
alternative treatment facilities will comply with applicable LID criteria, stormwater treatment
criteria, and hydromodification management criteria .
>-Indicate the project pollutants of concern (POCs) from Table 7 in Column 2 below.
TABLE 10: GROUPING OF POTENTIAL POLLUTANTS of Concern (POCs) by fate
during stormwater treatment
Pollutant Check Coarse Sediment and Trash Pollutants that tend Pollutants that tend
Project to associate with to be dissolved
Specific fine particles during following treatment
POCs treatment
Sediment X X
X
Nutrients X X X
Heavy Metals X
Organic Compounds X X
Trash & Debris X X
Oxygen Demanding X
Bacteria X X
Oil & Grease X X
Pesticides X
•
•
•
~ Indicate the treatment facility(s) chosen for this project in the following table.
TABLE 11: GROUPS OF POLLUTANTS and relative effectiveness of treatment
facilities
Pollutants of Bioretention Vegetated
Concern Facilities
(LID)
Coarse High
Sediment
and Trash
Pollutants High
that tend to
associate
with fine
particles
during
treatment
Pollutants Medium
that tend to
be dissolved
following
treatment
~ Please check the box(s) that best describes the Treatment BMP(s) and/or LID BMP
selected for this project.
TABLE 12: PROJECT LID AND TC-BMPS
Bioretention Facilites (LID)
[X]Bioretent:ion area
[g!Flow-through Planter
I2<JCistem with Bioretent:ion Facility
Settling Basins (Dry Ponds)
0Extended/ dry detention basin with
grass/vegetated lining
0Extended/ dry detention basin with impervious lining
Infiltration Facilities or Practices (LID)
0Infiltrat:ion basin
0Drywell
0Infiltrat:ion trench
Wet Ponds and Constructed Wetlands
0Wet pond/basin (permanent pool)
Oconstructed wetland
Vegetated Swales (LID<1>)
[g!V egetated Swale
Swales
High
Medium
Low
•
•
•
Media Filters
Austin Sand Filter
Delaware Sand Filter
Multi-Chambered Treatment Train (J\1CTT)
Higher-rate Biofilters
Tree-pit-style unit
Other
Higher-rate Media Filters
Vault-based filtration unit with replaceable cartridges
Other
Hydrodynamic Separator Systems
Swirl Concentrator
Cyclone Separator
Trash Racks
Catch Basin Insert
Catch Basin Insert w / Hydrocarbon boom
Other
Self-Treating or Self-Retaining Areas (LID)
Pervious Pavements
Vegetated Roofs
Other Landscane areas veP"eatated swales biorention
(IJ Must be designed per SUSMP ''Vegetated Swales" design criteria for LID credit (p. 65).
For design guidelines and calculations refer to Chapter 4 "Low Impact Development
Design Guide" in the SUSMP. Please show all calculations and design sheets for all
treatment facilities proposed in Attachment D .
•
•
•
~ Please describe why the chosen treatment BMP(s) was selected for this
project. For projects utilizing a low performing BMP, please provide a
feasibility analysis that demonstrates utilization of a treatment facility with a
hi_gh or medium removal efficiency ranking is infeasible.
The site has significant amount of landscape making it ideal for using
Detention ponds, planters, and vegetated swales. Also, each of these
Facilities can be incorporated into the landscape design to create an
Aesthically pleasing amenity for the site and remain economical to the
Client. The site's lack of existing infrastructure and existing slopes, do not
Lend itself to be treated with cisterns, rain barrels, pourous concrete or
Large underground vaults for treating and collecting stormwater runoff.
Treatment BMP must address runoff from developed areas. Please provide the post-
construction water quality treatment volume or flow values for the selected project
Treatment BMP(s). Guidelines for design calculations are located in Chapter 4 of
the County SUSMP. Label outfalls on the BMP map. The Water Quality peak rate
of discharge flow (QwQ) and the Water Quality storage volume (VwQ) is dependent
on the type of treatment BMP selected for the project.
Outfall Tributary Area QwQ VwQ
(acres) (cfs) (re)
• SINGLE SHEET POST-CONSTRUCTION BMP EXHIBIT
•
•
LANDSCAPE
AREA
BIORETENTION
PLUS VAULT
BIORETENTION
SWALE
POTENTIAL
FLOW-THROUGH
PLANTER BOX
LANDSCAPE
AREA
0
PAVERS
DINING
FF 352.75
LANDSCAPE
AREA
c c
I? c c
"' "' "' "' "' "' "-"-I
"' "' "' ~ I EXISTING 12" I
LANDSCAPE "-1 GAS~~~c I
AREA "' ~ R~a:1~~ I "-!"ERALE~1~4_:e·---_ LANDSCAPE
AREA ----A-I EXISTING12"
------"' SANOIEGO - -\ GAS & ELECTRIC -------
BIORETENTION
SWALE
LANDSCAPE
AREA
LANDSCAPE
AREA
DORM 1
FF 355.00
LANDSCAPE
AREA
DORM2
FF 355.00
POTENTIAL CISTERN
PLUS BIORETENTION
POTENTIAL CISTERN
PLUS BIORETENTION
BIORETENTION SWALE
IMPALA DRIVE
"' I EASEMENT
. rER
LANDSCAPE
AREA
\
\
\
-------
LANDSCAPE
AREA
PAVERS
EXISTING30"
SAN DIEGO
GAS & ELECTRIC
EASEMENT
REC. 3131/1960
PER FILE NOS.
65560 & 65561 O.R.
24 ft FIRE ACCESS ROAD
TURF-BLOCK MATERIAL,
IF FEASIBLE
GRAPHIC SCALE
30 0 15 30 60
~~--~---~-!llllrll ~~--~~~~~~~'
IN FEET
1 inch = 30 ft. --~======~plonning~==ir==============;-;:====~===============-----__j
............ interiors SITE PLAN EXHIBIT La POSADA MEN'S SHELTER
IMPALA DRIVE
PA/PM: AJW SHEET
:::;-WARE MALCOMB ~
-Leading Design for Commercial Real Estate 62511!ft0nwood plaza boulevud
::,:.':" ~ ":::' oolondo 80111
p 720.488.2626 f ?20.488.2625
CARLSBAD, CALIFORNIA
DATE REMARKS
03/22/11 SITE PLAN EXHIBIT SUBMITTAL TO CITY
JOB NO.:
JJG DRAWN BY: C1.0
•
•
•
STORMWATER FACILITY MAINTENANCE
~ Responsible Party for Long-term Maintenance:
Identify the parties responsible for long-term maintenance of the BMPs identified above
and Source Controls specified in this report.
Name: Sister Raymonda DuVall
Company Name: Catholic Charities
Phone Number: 619-231-2828
Street Address: 349 Cedar Street
City/State/Zip: San Diego, CA 92101
Email Address: SRMDu Vall@ccdsd.org
» Funding
Source:
Provide the funding source or sources for long-term operation and maintenance of
each BMP identified above. By certifying the Major SWMP the applicant is
certifying that the funding responsibilities have been addressed and will be
transferred to future owners.
Grant funded
•
•
•
OPERATION AND MAINTENANCE RESPONSIBILITY
The Operation and maintenance (O&M) requirement of the treatment facilities shall be performed
by the owners or owner's representative per the City of Carlsbad requirements &
recommendations or as assessment requires it. The owner or owner's representative shall provide
specifications for the handling and placement of any wastes. As well as providing a schedule and
frequency for the 0 & M.
Prior to the approval of SWMP, the facility manager shall:
• Identify the parties (name, address, and telephone number) responsible for O&M,
including a written agreement with the entities responsible for O&M. This agreement
can take the form of a Covenant and Agreement recorded by the Project Proponent with
the County Recorder, POA CC&Rs, or other instrument sufficient to guarantee perpetual
O&M.
• Provide self-inspections and record-keeping requirements for BMPs (review local
specific requirements regarding self-inspections and/or annual reporting), including
identification of responsible parties for inspection and record-keeping.
• Provide thorough descriptions of water quality monitoring, if required by the City.
Inspection and Maintenance Matrix
BMP Description Activity (Frequency) Responsibility
Source Control Structural BMPs
Verify that the irrigation system is working properly.
Check for broken sprinkler heads and verify proper
Site Design & coverage. Listen for water flowing through valves when Owner and/or
SO-system is off as a check for possible leaks. Adjust Site
10 Landscaping valve run times to avoid over-watering and/or ponding Landscaping Planning in landscape areas. Review instruction manuals and Contractor
consult with the system manufacturer for system
repairs. (Twice per month)
so-Efficient Verify that the irrigation system is working properly. Owner and/or
12 Irrigation Check for broken sprinkler heads and verify proper Site
coverage. Listen for water flowing through valves when Landscaping
system is off as a check for possible leaks. Adjust Contractor
valve run times to avoid over-watering and/or ponding
• in landscape areas. Review instruction manuals and
consult with the system manufacturer for system
repairs. {Twice per month)
Trash storage areas are covered and enclosed to
SD-Trash prevent introduction of trash & debris to site runoff. Owner 32 Enclosures Proper receptacles will be used and the area kept
clean. {Weekly)
Routine Non-Structural BMPs
Owner assumes financial responsibility for
property maintenance and implementation of • practices set forth in this WQMP. Whenever
possible, the Owner shall relay this
N1 Education for information to other employees and Owner Property Owners occupants of the facility in order to increase
their understanding of stormwater quality,
sources of pollutants, and what they can do
to reduce pollutants in Stormwater. {Annually
at a minimum)
Owner and contracted personnel are
responsible for knowledge and Owner and/or
N4 BMP Maintenance implementation of all site requirements contracted site
specified in this WQMP. WQMP shall be maintenance
reviewed by owner and any contracted personnel
maintenance personnel. (Annually)
• N11 Litter Control Pick up debris and trash to maintain a clean Owner and/or
• site. (Weekly) contracted site
Sweep hardscape areas to prevent maintenance
accumulation of debris and pollutants. (Once personnel
per month, after heavy winds, and prior to
forecasted storm events)
Inspect drain inlets and catch basins. Clean
prior to storm season and as necessary no
later than October 1st each year. (Annually)
Keep grates in landscape areas clear of
debris. (Weekly) Owner and/or Site
N14 Drainange Facility Contact Riverside County Department of Landscaping Inspection Environmental Health (951) 766-2824) in
case vector concerns are observed (i.e. Contractor
standing water in or around a BMP for more
than 72 hours)
Inspection and Maintenance records should • be kept for five (5) years .
Treatment Control BMPs
Check the debris level in the drain inserts
prior to, immediately after, and once per
month during the rainy season (Oct 1st to Apr
30th). Remove
accumulated debris at each inspection and Owner and/or
MP-replace the filter media once per year during contracted site
52 Drain Inserts the pre-season inspection. (Annually) maintenance Waste generated from cleaning the iinserts personnel and drain inlets shall be disposed of properly
and not discharged into the storm drain
system. See Appendices A & B for product
and service information specific to each insert
I type.
•
•
•
•
);> PRIVATE OWNERSHIP AND MAINTENANCE:
For Priority Development Projects (PDP), the owner will be required to execute a
Permanent Stormwater Quality BMP Maintenance Agreement.
TABLE 5-1. SCHEDULE for Planning Operation and Maintenance of stormwater
treatment BMPs.
STAGE DESCRIPTION SCHEDULE
1 Determine facility ownership and maintenance Discuss with planning staff at
responsibility pre-application meeting.
2 Identify typical maintenance requirements. In initial submitta~ coordinate
with land-use application.
3 Develop detailed operation and maintenance plan. Prior to plan check submittal
4 Interim operation and maintenance facilities. During and following
construction including warranty
period.
5 Formal transfer of operation and maintenance On sale ad transfer of property
responsibility or permanent occupancy.
6 Ongoing maintenance and compliance with In perpetuity.
inspection & reporting requirements .
•
•
•
STEPS
SWMP CERTIFICATION
"'1 'he selection and preliminary design of stormwater treatment and other control
measures in this plan have been prepared under the direction of the following Registered
Civil Engineer and meet the requirements of Regional Water Quality Control Board Order
R9-2007 -0001 and subsequent amendments. Our prclirninary assessment indicated that
the project site can provide adequate room to accommodate the tC(luired sizes for the on-
site LID and Hydromodification facilities. Sizing calculations will be provided later, prior
to planning commission hearing."
Date
•
•
•
ATTACHMENT A
ATTACHMENT B
ATTACHMENT C
ATTACHMENT D
ATTACHMENT£
ATTACHMENT F
ATTACHMENT G
ATTACHMENT H
ATTACHMENT I
ATTACHMENT J
ATTACHMENT K
ATTACHMENT L
Vicinity Map I Go ogle Map I GIS Map Info
Appendix 1: Stormwater Pollutant Sources
and Source Control Checklist
2006 CWA Section 303d List of Water
Quality Limited Segments Requiring TMDLS
Table 2.2-Beneficial Uses
LID DESIGN GUIDE for
1. Self Treating & Self Retaining Areas
2. Bioretention Facilities
3. Cistern with Bioretention Facility
4. Flow-through Planter
LID FACT SHEETS
Concept Grading Plan
Concept Utility Plan
Post Development Drainage Map
Pre-Development Drainage Map
Operation and Maintenance Verification
Forms
Tracking and Inventory Report Forms
•
ATTACHMENT A
Vicinity Map/Google Map/GIS Map Info
•
•
,1
•
LA POSADA MEN'S SHELTER
PROJECT SITE
VICINITY MAP
SCALE: N. T.S
2478 IMPALA DRIVE
CARLSBAD, CA 92008
N
CD
2472 Impala Drive, Carlsbad, CA-Google Maps
Coogle maps
•
Address 2472 Impala Dr
Carlsbad, CA 92010
Lake __ -t..._,, ,
~BMf·
-,c ( Calavera \\ . e r.31kll"' "· -"Q. '
~ ~ Calavera
if Hills VIllage ,~
Page 1 of 1
Notes LA POSADA MEN'S SHELTER
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Assessed Acreage
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School District
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Par1< District
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• ~ Parcal Boundary
3/30/2011
•
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0 Water Bodies
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LJ Out of County Jurisdiction
• ~-0 1 2 " . -·· ·--1148.973
Clerk of tbe Board Documeat Number: 0768628
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LEGEND
Hydrol0~1c Area Boundary (HA)
Hydrologic Subarea Boundary (SA)
N
t
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Ruind:J11Iy 1976
Rni .. ll: A ... ••t 1986 S!atl Wat•r RI5Durcu Co~trol8oard
S~rnilt11~e• lind NOCII!f .... I~IJ !•CtiiHI
T.E.L.au11da,P.E. ----------------
Re••ud: Alltti 19tl!5
R•glollal Water OuaiUJ ca~trol Board-Sail 0/efo Roglo•
Wator Quality Sto11darf• Unit
O.F. tfolfii,Jr
State of California
KEY TO REGION
REGIONAL WATER QUALITY CONTROL BOARD
San Diego Region (9)
SAN DIEGO HYDROLOGIC BASIN PLANNING AREA (SO)
S c a I e I • 2 50, 0 0 0
-;;:::-.:::-;.
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•
•
•
ATTACHMENT B
Appendix 1: Stormwater Pollutant Sources and
Source Control Checklist
• • •
Stormwater Pollutant Sources and Source Control Checklist
How to Use this Checklist:
1. Review Column 1 and identify which of these potential sources of stormwater pollutants apply to your project. Check each box that applies.
2. Review Column 2 and incorporate all of the corresponding applicable BMPs in your SUSMP Drawings.
3. Review Columns 3 and 4 and incorporate all of the corresponding applicable permanent controls and operational BMPs in a table in your SUSMP Drawings. For
PDP's, in your SWMP, use the format shown in Table 3-1. In the SWMP, 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 ••. THEN YOUR PRO.JECT SHOULD INCLUDE THESE SOURCE CONTROL BMPs
PRO.JECT SITE ..•
1 2 3 4
Potential Sources of Permanent Controls-Show on Permanent Controls-List in SWMP Operational BMPs-lnclude in
Runoff Pollutants SUSMP Drawings Table and Narrative SWMP Table and Narrative
[J A. On-site storm drain [J Locations of inlets. [J Mark all inlets with the words "No [J Maintain and periodically repaint or
inlets Dumping! Flows to Bay" or similar. replace inlet markings.
[J Provide stormwater pollution
prevention information to new site
owners, lessees, or operators.
[J See applicable operational BMPs in
Fact Sheet SC-44, "Drainage System
Maintenance," in the CASQA
Stormwater Quality Handbooks at
www.cabmphandboQks.cQm
[J 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 of9
• • •
Q B. Interior floor drains Q State that interior floor drains and Q Inspect and maintain drains to
and elevator shaft sump elevator shaft sump pumps will be prevent blockages and overflow.
pumps plumbed to sanitary sewer.
Q C. Interior parking Q State that parking garage floor drains Q Inspect and maintain drains to
garages will be plumbed to the sanitary sewer. prevent blockages and overflow.
Q D1. Need for future Q Note building design features that Q Provide Integrated Pest Management
indoor & structural pest discourage entry of pests. information to owners, lessees, and
control operators.
Q D2. Landscape/ Q Show locations of native trees or State that final landscape plans will Q 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.
Q Preserve existing native trees, shrubs, Q See applicable operational BMPs in
Q Show self-retaining landscape and ground cover to the maximum Fact Sheet SC-41, "Building and
areas, if any. extent possible. Grounds Maintenance," in the
Q Q
CASQA Stormwater Quality
If a PDP, show stormwater Design landscaping to minimize Handbooks at
treatment facilities. irrigation and runoff, to promote www .cabm~handbooks.com
surface infiltration where appropriate,
and to minimize the use of fertilizers Q Provide IPM information to new
and pesticides that can contribute to owners, lessees and operators.
stormwater pollution.
Q Where landscaped areas are used to
retain or detain stormwater, specify
plants that are tolerant of saturated
soil conditions.
Q Consider using pest-resistant plants,
especially adjacent to hardscape.
Q To insure successful establishment,
select plants appropriate to site soils,
slopes, climate, sun, wind, rain, land
use, air movement, ecological
consistency, and plant interactions.
Q E. Pools, spas, ponds, Q Show location of water feature and Q If the local municipality requires pools Q 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 .cabm~handbooks.com
requirements.
Page2 of9
• • •
[J F. Food service [J For restaurants, grocery stores, and [J Describe the location and features of [J
other food service operations, show the designated cleaning area.
location (indoors or in a covered
area outdoors) of a floor sink or [J Describe the items to be cleaned in
other area for cleaning floor mats, this facility and how it has been sized
containers, and equipment. to insure that the largest items can be
accommodated.
[J On the drawing, show a note that
this drain will be connected to a
grease interceptor before
discharging to the sanitary sewer.
[J G. Refuse areas [J Show where site refuse and [J State how site refuse will be handled [J 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
[J State that signs will be posted on or receptacles. Inspect receptacles
If dumpsters or other receptacles near dumpsters with the words "Do regularly; repair or replace leaky
[J 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-
[J 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.cabmphandbooks.com
[J H. Industrial processes. [J Show process area. [J If industrial processes are to be [J 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 of9
• • •
[J I. Outdoor storage of [J Show any outdoor storage areas, [J Include a detailed description of [J 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.cabm~handbooks.com
maintenance.) [J 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
[J 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 (CalARP)
site.
• Aboveground Storage Tank
• Uniform Fire Code Article 80
Section 103(b) & (c) 1991
• Underground Storage Tank
Page 1 of9
• • •
Cl .1. Vehicle and Cl Show on drawings as appropriate: Cl If a car wash area is not provided, Describe operational measures to
Equipment Cleaning
(1) Commercial/industrial facilities
describe measures taken to discourage implement the following (if
on-site car washing and explain how applicable):
having vehicle /equipment these will be enforced.
cleaning needs shall either provide Cl 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. Cl Car dealerships and similar may
rinse cars with water only.
(2) Multi-dwelling complexes shall
have a paved, bermed, and covered Cl See 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-www.cabmphandbooks.com
off to discourage such use).
(3) 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 sewer.
(4) 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 of9
• • •
Q K. Vehicle/Equipment Q Accommodate all vehicle Q 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 [J No person shall dispose of, nor
stormwater. Q State that there are no floor drains or if permit the disposal, direcdy or
there are floor drains, note the agency indirecdy of vehicle fluids, hazardous
Q Show secondary containment for from which an industrial waste materials, or rinsewater 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 Q State that there are no tanks, Q 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
Q 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 open containers
discharge permit will be obtained. [J containing vehicle fluid, unless such
containers are in use or in an area of
secondary containment.
Page 6 of9
• • •
[J L. Fuel Dispensing [J Fueling areas1 shall have [J The property owner shall dry sweep
Areas impermeable floors (i.e., portland the fueling area routinely.
cement concrete or equivalent
smooth impervious surface) that [J 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 www.cabmnhandbooks.com
prevents run-on of stormwater to
the maximum extent practicable.
Fueling areas shall be covered by a
[J
canopy that extends a minimum of
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 area1.] The canopy [or
cover] shall not drain onto the
fueling area.
I The fueling area shall be defined as the area extending a minimum of 6.5 feet from the comer of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minimum of one
foot, whichever is greater.
Page 7 of9
• • •
Cl M. Loading Docks Cl Show a preliminary design for the Cl Move loaded and unloaded items
loading dock area, including indoors as soon as possible.
roofing and drainage. Loading
docks shall be covered and/ or Cl 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 www.cabmnhandbooks.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.
Cl 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.
Cl
Provide a roof overhang over the
loading area or install door skirts
(cowling) at each bay that enclose
the end of the trailer.
Cl N. Fire Sprinkler Test Cl Provide a means to drain fire sprinkler Cl 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,!;;abmnhandboQks.com
Page 8 of9
• • •
0. Miscellaneous Drain Q Boiler drain lines shall be directly or
or Wash Water indirectly connected to the sanitary
sewer system and may not discharge
Q Boiler drain lines to the storm drain system.
Q Condensate drain lines Q Condensate drain lines may discharge
to landscaped areas if the flow is small
Q Rooftop equipment enough that runoff will not occur.
Q Drainage sumps
Condensate drain lines may not
discharge to the storm drain system.
Q Roofing, gutters, and Rooftop mounted equipment with
trim. potential to produce pollutants shall
[J be roofed and/ or have secondary
containment.
Any drainage sumps on-site shall
feature a sediment sump to reduce the
[J quantity of sediment in pumped water.
Avoid roofing, gutters, and trim made
of copper or other unprotected metals
Q that may leach into runoff.
Q P. Plazas, sidewalks, [J Plazas, 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.
Page9 of9
•
•
•
ATTACHMENT C
2006 CW A Section 303d List of Water Quality
Limited Segments Requiring TMDLS
• • • 2006 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENTS REQUIRING TMDLS
USEPA APPROVAL DATE: JUNE 28,2007
CAL WATER POTENTIAL ESTIMATED PROPOSED TMDL
REGION TYPE NAME WATERSHED POLLUTANT/STRESSOR SOURCES SIZE AFFECTED COMPLETION
Toxaphene 7.8 Miles 2019
Source Unknown
8 R San Diego Creek Reach 2 80111000
Metals 6.3 Miles 2007
Urban Runoff/Storm Sewers
8 R Santa Ana River, Reach 4 80127000
Pathogens 14 Miles 2019
Non point Source
8 R Santiago Creek. Reach 4 80112000
Salinity/TDS/Chlorides 9.8 Miles 2019
Source Unknown
8 c Seal Beach 80111000
Enterococcus 0.53 Miles 2019
Impaired 50 yards around drain atlst Street.
Source Unknown
PCBs (Polychlorinated biphenyls) 0.53 Miles 2019
Source Unknown
8 R Silverado Creek 80112000
Pathogens 11 Miles 2019
Unknown Nonpoint Source
Salinity/TDS/Chlorides 11 Miles 2019
Unknown Nonpoint Source
8 R Summit Creek 80171000
Nutrients 1.5 Miles 2008
Construction/Land Development
9 R Agua Hedionda Creek 90431000
Manganese 7 Miles 2019
Source Unknown
Page 203 of 230
• • • 2006 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENTS REQUIRING TMDLS
USEPA APPROVAL DATE: JUNE 28,2007
ESTIMATED PROPOSED TMDL
REGION TYPE NAME
CAL WATER
WATERSHED POLLUTANT/STRESSOR
POTENTIAL
SOURCES SIZE AFFECTED COMPLETION
9 E Agua Hedionda Lagoon 90431000
9 R Aliso Creek 90113000
Selenium
Sulfates
Total Dissolved Solids
Indicator bacteria
Sedimentation/Siltation
Indicator bacteria
Source Unknown
Source Unknown
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Nonpoint/Point Source
Nonpoint/Point Source
7 Miles 2019
7 Miles 2019
7 Miles 2019
6.8 Acres 2006
6.8 Acres 2019
19 Miles 2005
This listing for indicator bacteria applies to the Aliso Creek mains rem and all the major tributaries of Aliso Creek which
are Sulphur Creek, Wood Canyon, Aliso Hills Canyon, Dairy Fork, and English Canyon.
Phosphorus
Urban Runoff/Storm Sewers
Unknown point source
Non point/Point Source
19 Miles 2019
This listing for phosphorus applies to the Aliso Creek mainstem and all the major tributaries of Aliso Creek which are
Sulphur Creek, Wood Canyon, Aliso Hills Canyon, Dairy Fork, and English Canyon.
Toxicity
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
19 Miles 2019
This listing for toxicity applies to the Aliso Creek mainstem and all the major tributaries of Aliso Creek which are
Sulphur Creek, Wood Canyon, Aliso Hills Canyon, Dairy Fork, and English Canyon.
Page 104 of 130
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
•
ATTACHMENT D
Table 2.2 -Benefecial Uses
•
•
• • Table 2-2. BENEFICIAL USES OF INLAND SURFACE WATERS
Inland Surface Waters 1· 2
San Diego County Coastal Streams
Lorna Alta Creek
Loma Alta Slough
Buena Vista Lagoon
Buena Vista Creek
Buena Vista Creek
Agua Hedionda
Agua Hedionda Creek
Buena Creek
Agua Hedionda Creek
Letterbox canyon
Canyon de las Encinas
Cottonwood Creek
Moonlight Creek
e Existing Beneficial Use
0 Potential Beneficial Use
+ Excepted from MUN (See Text)
Table 2-2
BENEFICIAL USES
BENEFICIAL USE
Hydrologic M A I
p
G F p R R B w c w
Unit Basin R R E E I A 0 I
Number u G N 0 w s 0 c c 0 R L L N R D c R H w 1 2 L M D D
4.10 + 0 • • •
4.10 See Coastal Waters -Table 2-3
4.21 See Coastal Waters -Table 2-3
4.22 + • • • • • •
4.21 + • • • • • •
4.31 See Coastal Waters -Table 2-3
4.32 • • • • • • •
4.32 • • • • • • •
4.31 • • • • • • • •
4.31 • • • • • • •
4.40 + 0 • • •
4.51 + • • • • •
4.51 + • • • • •
1 Waterbodies are listed multiple times if they cross hydrologic area or sub area boundaries.
2 Beneficial use designations apply to all tributaries to the indicated waterbody, if not listed separately.
2-31
•
R s
A p
R w
E N
•
•
•
•
ATTACHMENT E
LID DESIGN GUIDE
Self Treating and Self Retaining Areas
Bioretention Facilities
Cistern with Bioretention Facility
Flow-through Planter
•
•
•
CHAPTER 4: LID DESIGN GUIDE
... CRITERIA
Rainfall on self-treating areas .inliltmtes
or-during intense storms--drains
directly off-site or to the storm drain
system.
Self-retaining areas are designed to
retlin the first one inch of Wnfall
without producing any runoff During
intense storms, runoff may drain off-
site, to the storm drain system, or to
IMPs.
UD design seeks to manage runoff from roofs and paving so effects
on water quality and hydrology are minimized. Runoff from
landscaping, however, does not need to be managed the same way.
Runoff from landscaping can be managed by creating self-treating and
self-retaining areas.
Self-treating areas are natural, landscaped, or turf areas that drain
direcdy off site or to the storm drain system. Examples include
upslope undeveloped areas that are ditched and drained around a
development and grassed slopes that drain offsite to a street or storm
drain. Self-treating areas may not drain on to adjacent paved areas.
Best Uses
• Heavily landscaped
sites
Advantages
• Complements site
landscaping
Limitations
• Requires substantial
square footage
• Requires soil
information with
adequate drainage
• Need drainage
overflow design
• Grading
requirements must
be coordinated with
landscape design
Where a landscaped area is upslope from or surrounded by paved areas, a self-retaining area
(also called a zero-discharge area) may be created. Self-retaining areas are designed to retain the
first one inch of rainfall without producing any runoff. The technique works best on flat, heavily
landscaped sites. It may be used on mild slopes if there is a reasonable expectation that the first
inch of rainfall would produce no runoff.
To create self-retaining turf and landscape areas in flat areas or on terraced slopes, berm the area
or depress the grade into a concave cross-section so that these areas will retain the first inch of
rainfall. Inlets of area drains, if any, should be set 3 inches above the low point to allow ponding.
Areas draining to self retaining areas. Provided that onsite soil infiltration rates are verified by
the Geotechnical Engineer, then drainage from roofs and paving can be directed to self-retaining
areas and allowed to infiltrate into the soil. The maximum allowable ratio is 2 parts impervious: 1
part pervious .
78 City of Carlsbad SUSMP-.January 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
The self-retaining area must be bermed or depressed to retain an inch of rainfall including the
flow from the tributary impervious area.
.... DETAILS
Drainage from self-treating areas must flow to off-site streets or storm drains without flowing
on to paved areas.
Pavement within a self-treating area cannot exceed 5% of the total area.
In self-retaining areas, overflows and area drain inlets should be set high enough to ensure
ponding over the entire surface of the self-retaining area.
13' (MIN.)
Set overflows and atta drain iold:s high
enough to ensw:e pending (3" deep) over
the surface of the self-retaining area.
Self-retaining areas should be designed to promote even distribution of ponded runoff over the
area.
Leave enough reveal (from pavement down to landscaped surface) to accommodate buildup of
turf or mulch.
.... APPLICATIONS
Well-draining soil supported by soil percolation rates verified by Geotechnical Engineer
Lawn or landscaped areas adjacent to streets can be considered self-treating areas.
Self-retaining areas can be created by depressing lawn and landscape below surrounding
sidewalks and plazas.
Runoff from walkways or driveways in parks and park-like areas can sheet-flow to self-retaining
areas.
Roof leaders can be connected to self-retaining areas by piping beneath plazas and walkways. If
necessary, a ''bubble-up" can be used .
79 City of Carlsbad SUSMP-.January 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
Connecting a roof leader ro a self-retllining
area. The head from the eave height makes it
possible to route roof drainage some
distance away from
the building. Coonlinat.e with soils engineer
as necessary
Self-retaining areas can be created by terracing mild slopes. The elevation difference promotes
subsurface drainage .
RETENTION ARfA/
TERRACE\
RETAINING
WALL
Mild slopes can be tcmccd to =ate self-retllining areas.
.,. DESIGN CHECKLIST FOR SELF-TREATING AREAS
Ll The self-treating area is at least 95% lawn or landscaping (not more than 5% impervious).
Ll Re-graded or re-landscaped areas have amended soils, vegetation, and irrigation as may be required to maintain
soil stability and permeability.
Ll Runoff from the self-treating area does not enter a TCBMP /IMP or another drainage management area, but
goes directly to the storm drain system .
80 City of Carlsbad SUSMP-January 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
~ DESIGN CHECKLIST FOR SELF-RETAINING AREAS
r::J Area is bermed all the way around or graded concave.
r::J When impervious area is directed to a self retaining area, provide volume calculations to show that 1-inch of
rainfall over the study area can be retained.
r::J Slopes do not exceed 4%.
D Entire area is lawn, landscaping, or pervious pavement (see criteria in Section 4).
D Area has amended soils, vegetation, and irrigation as may be required to maintain soil stability and permeability.
D Provide soil percolation rates and design details to show that self retaining area will drain properly after a storm
event (within 72-hours or as determined by County Health Department) and will handle larger storm events.
D Any area drain inlets are at least 3-inches above surrounding grade.
D When self-retaining area become large, select and size a TCBMP /IMP to treat the runoff.
DESIGN CHECKLIST FOR AREAS DRAINING TO SELF-RETAINING AREAS
D Ratio of tributary impervious area to self-retaining area is not greater than 2:1 .
D Roofleaders collect runoff and route it to the self-retaining area.
D Paved areas are sloped so drainage is routed to the self-retaining area.
D Outlets/Inlets are designed to protect against erosion and distribute runoff across the area.
D Design accommodates 1 00-year event as well as treatment volumes
81 City of Carlsbad SUSMP-January 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
Best Uses
• Commercial areas
1r mn .....,c:on.,.,.t ma • Residential
, __ ---subdivisions
Use sizmg foci..-to .......... ..., minimum.....,
Biotetention facility configured for tn:atment-only requirements. Bioretention facilities
an rectangular, linear, or nearly any shape.
Bioretention detains runoff in a surface reservoir, filters it through
plant roots and a biologically active soil mix, and then infiltrates it
into the ground. Where native soils are less permeable, an
underdrain conveys treated runoff to storm drain or surface
drainage.
Bioretention facilities can be configured in nearly any shape. When
configured as linear swales, they can convey high flows while
percolating and treating lower flows.
Bioretention facilities can be configured as in-ground or above-
ground planter boxes, with the bottom open to allow infiltration
to native soils underneath. If infiltration cannot be allowed, use
the sizing factors and criteria for the Flow-Through Planter.
.... CRITERIA
For development projects subject only to runoff treatment
requirements, the following criteria apply:
Parameter
Soil mix depth
Soil mix minimum percolation rate
Soil mix surface area
Criterion
18 inches minimum
5 inches per hour minimum sustained
(1 0 inches per hour initial rate
recommended)
0.04 times tributary impervious area (or
equivalent)
• Industrial
developments
• Roadways
• Parking lots
• Fit in setbacks,
medians, and other
landscaped areas
Advantages
• Can be any shape
• Low maintenance
• Can be landscaped
Umitations
• Require 4% of
tributary impervious
square footage
• Typically requires 3-4
feet of head
• Irrigation typically
required
85 City of Carlsbad SUSMP-January 141 2011
•
•
•
Parameter
Surface reservoir depth
Underdrain
... DETAILS
SECTION 4: LID DESIGN GUIDE
Criterion
6 inches minimum; may be sloped to 4
inches where adjoining walkways.
Required in Group "C" and "D" soils.
Perforated pipe embedded in gravel
("Class 2 permeable" recommended),
connected to storm drain or other
accepted discharge point.
Plan. On the surface, a bioretention facility should be one level, shallow basin--or a series of
basins. As runoff enters each basin, it should flood and fill throughout before runoff overflows
to the oudet or to the next downstream basin. This will help prevent movement of surface
mulch and soil mix.
-«='""""'"""'??""~~~-, ______ .JI
Use check dams for linear bioreteorion facilities
(SWllles) on a slope.
In a linear swale, check dams should be placed so that the lip of each dam is at least as high as
the toe of the next upstream dam. A similar principle applies to bioretention facilities built as
terraced roadway shoulders.
Inlets. Paved areas draining to the facility should be graded, and inlets should be placed, so that
runoff remains as sheet flow or as dispersed as possible. Curb cuts should be wide (12" is
recommended) to avoid clogging with leaves or debris. Allow for a minimum reveal of 4"-6"
between the inlet and soil mix elevations to ensure turf or mulch buildup does not block the
inlet. In addition, place an apron of stone or concrete, a foot square or larger, inside each inlet to
prevent vegetation from growing up and blocking the inlet .
86 City of Carlsbad SUSMP-January 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
R=mmended design details fur bioretention facility inlets (see text).
Where runoff is collected in pipes or gutters and conveyed to the facility, protect the landscaping
from high-velocity flows with energy-dissipating rocks. In larger installations, provide cobble-
lined channels to better distribute flows throughout the facility.
Upturned pipe oudets can be used to dissipate energy when runoff is piped from roofs and
upgradient paved areas.
Soil mix. The required soil mix is similar to a loamy sand. It must maintain a rrurumum
percolation rate of 5" per hour throughout the life of the facility, and it must be suitable for
maintaining plant life. Typically, on-site soils will not be suitable due to clay content.
Storage and drainage layer. "Class 2 permeable," Caltrans specification 68-1.025, is
recommended. Open-graded crushed rock, washed, may be used, but requires 4"-6" washed pea
gravel be substituted at the top of the crushed rock gravel layers. Do not use filter fabric to
separate the soil mix from the gravel drainage layer or the gravel drainage layer from the native
soil .
87 City of Carlsbad SUSMP-January 14,2011
•
•
•
SECTION 4: LID DESIGN GUIDE
Underdralns. No underdrain is required where native soils beneath the facility are Hydrologic
Soil Group A or B. For treatment-only facilities where native soils are Group C or D, a
perforated pipe must be bedded in the gravel layer and must terminate at a storm drain or other
approved discharge point.
Outlets. In treatment-only facilities, outlets must be set high enough to ensure the surface
reservoir fills and the entire surface area of soil mix is flooded before the outlet elevation is
reached. In swales, this can be achieved with appropriately placed check dams.
The outlet should be designed to exclude floating mulch and debris.
Vaults, utility boxes and light standards. It is best to locate utilities outside the bioretention
facility-in adjacent walkways or in a separate area set aside for this purpose. If utility structures
are to be placed within the facility, the locations should be anticipated and adjustments made to
ensure the minimum bioretention surface area and volumes are achieved. Leaving the final
locations to each individual utility can produce a haphazard, unaesthetic appearance and make
the bioretention facility more difficult to maintain.
Emergency overflow. The site grading (construction) plan shall include details that demonstrate
the bioretention basin can handle larger (up to 1 00-year) storm events and address potential
clogging of the overflow and route emergency overflows safely.
Trees. Bioretention areas can accommodate small or large trees. There is no need to subtract the
area taken up by roots from the effective area of the facility. Extensive tree roots maintain soil
permeability and help retain runoff. Normal maintenance of a bioretention facility should not
affect tree lifespan.
The bioretention facility can be integrated with a tree pit of the required depth and filled with
structural soil. If a root barrier is used, it can be located to allow tree roots to spread throughout
the bioretention facility while protecting adjacent pavement. Locations and planting elevations
should be selected to avoid blocking the facility's inlets and outlets.
Bioretention &cility configumi as a tree wd1
The root banic:r is option21.
88 City of Carlsbad SUSMP-.lanuary 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
..,_ APPLICATIONS
Multi-purpose landscaped areas. Bioretention facilities are easily adapted to serve multiple
purposes. The loamy sand soil mix will support turf or a plant palette suitable to the location and
a well-drained soil.
Example landscape treatments:
•
•
•
•
•
•
•
•
Lawn with sloped transition to adjacent landscaping .
Swale in setback area
Swale in parking median
Lawn with hardscaped edge treatment
Decorative garden with formal or informal plantings
Traffic island with low-maintenance landscaping
Raised planter with seating
Bioretention on a terraced slope
',(. _...;.;.. ~.J.I ,·l-
Lt 1
·L__L
Bioretention facility configurM as a recessed deconttive
lawn with hanlscaped edge. Bioretention facility c:onfiguml and pJantm as a lawn/ play a=.
89 City of Carlsbad SUSMP-.lanuary 14, 2011
•
•
•
SECTION 4: LID DESIGN GUIDE
Residential subdivisions. Some subdivisions are designed to drain roofs and driveways to the
streets (tn the conventional manner) and then drain the streets to bioretention areas, with one
bioretention area for each 1 to 6 lots, depending on subdivision layout and topography.
Bioretention areas may be placed on separate, joindy-owned parcel(s).
Bioretmtion facility receiving clrainage
from individual lots and the street in
a residential subdivision.
Sloped sites. Bioretention facilities must be constructed as a basin, or series of basins, with the
circumference of each basin set level. It may be necessary to add curbs or low retaining walls .
R.INOFf TO f'UoN1Bl ARIJ\\---...,.
~.o.III<IN~
801.J.N'Ol---.....
Bioretmtion facility conligunrl as a patkiog median.
Note use ofbollan:ls in place of curbs, eliminating the need for curb cuts.
90 City of Carlsbad SUSMP-.January 14,2011
•
•
•
SECTION 4: LID DESIGN GUIDE
Design Checklist for Bloretention
0 Volume or depth of surface reservoir meets or exceeds minimum.
0 18" depth "loamy sand" soil mix with minimum long-term percolation rate of 5"/hour.
0 Area of soil mix meets or exceeds minimum.
0 Perforated pipe underdrain bedded in "Class 2 perm" with connection and sufficient head to
storm drain or discharge point (except in "A" or "B" soils).
0 No filter fabric.
0 Underdrain has a clean-out port consisting of a vertical, rigid, non-perforated PVC pipe,
with a minimum diameter of 6 inches and a watertight cap.
0 Location and footprint of facility are shown on site plan and landscaping plan.
0 Bioretention area is designed as a basin (level edges) or a series of basins, and grading plan is
consistent with these elevations. If facility is designed as a swale, check dams are set so the
lip of each dam is at least as high as the toe of the next upstream dam .
0 Inlets are 12" wide, have 4"-6" reveal and an apron or other provision to prevent blockage
when vegetation grows in, and energy dissipation as needed.
0 Overflow connected to a downstream storm drain or approved discharge point.
0 Emergency spillage will be safely conveyed overland.
0 Plantings are suitable to the climate and a well-drained soil.
0 Irrigation system with connection to water supply.
0 Vaults, utility boxes, and light standards are located outside the minimum soil mix surface
area.
0 When excavating, avoid smearing of the soils on bottom and side slopes. Minimize
compaction of native soils and "rip" soils if clayey and/ or compacted. Protect the area from
construction site runoff .
91 City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
PLAN VIEW
NOT TO SCALE
(9SECTION
""',. ICOl.E
NOTE
1. SURFACE MVo UM1T DETERMINED BY EXTENT OF SPECIFEO PlANTING loiiX. WHICH IS GOVERNED BY THE OVTlET SPILL ELEVATION. FOR REQUIRED SURF~E
AREJoo REFER TO THE FIICTORS AND EQUATIONS IH THE SIORioiWATER C.3 GUIDEBOOK.
2. V, STORAGE ACCOMPliSHED WITl1 INFII.TRATIOH ARCHES, PERFORATEQ PIPES. ClASS 2 PERM OR OTHER AT THE DESIGNERS DISCRETlON.
Bioretention Facility
92 City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
A cistern in series with a bioretention facility can meet
treatment requirements where space is limited. In this
configuration, the cistern is equipped with a flow-control orifice
and the bioretention facility is sized to treat a trickle outflow
from the cistern.
... CRITERIA
Cistern. The cistern must detain the volume calculated by
Equation 4-8 and must include an orifice or other device
designed for a 24-hour drawdown time.
Bioretention facility. See the design sheet for bioretention
facilities. The area of the bioretention facility must be sized to
treat the maximum discharge flow, assuming a percolation rate
of 5" per hour through the engineered soil.
Use with sand filter. A cistern in series with a sand filter can
meet treatment requirements. See the discussion of treatment
facility selection in Section 2 and the design guidance for sand
filters in Section 4.
... DETAILS
Flow-control orifice. The cistern must be equipped with an
orifice plate or other device to limit flow to the bioretention
area.
Best Uses
• In series with a
bioretention facility
to meet treatment
requirement in
limited space.
• Management of roof
runoff
• Dense urban areas
Advantages
• Storage volume can
be in any
configuration
Limitations
• Somewhat complex
to design, build, and
operate
• Requires head for
both cistern and
bioretention facility
Preventing mosquito harborage. Cisterns should be designed to drain completely, leaving no
standing water. Drains should be located flush with the bottom of the cistern. Alternatively--or
in addition-all entry and exit points, should be provided with traps or sealed or screened to
prevent mosquito entry. Note mosquitoes can enter through openings 1/t6" or larger and will fly
for many feet through pipes as small as lj4".
Exclude debris. Provide leaf guards and/ or screens to prevent debris from accumulating in the
cistern.
Ensure access for maintenance. Design the cistern to allow for cleanout. Avoid creating the
need for maintenance workers to enter a confined space. Ensure the outlet orifice can be easily
accessed for cleaning and maintenance .
102 City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
A cistern in series· with a bioretention facility can meet
treatment requirements where space is limited. In this
configuration, the cistern is equipped with a flow-control orifice
and the bioretention facility is sized to treat a trickle outflow
from the cistern.
... CRITERIA
Cistern. The cistern must detain the volume calculated by
Equation 4-8 and must include an orifice or other device
designed for a 24-hour drawdown time.
Bioretentlon facility. See the design sheet for bioretention
facilities. The area of the bioretention facility must be sized to
treat the maximum discharge flow, assuming a percolation rate
of 5" per hour through the engineered soil.
Use with sand filter. A cistern in series with a sand filter can
meet treatment requirements. See the discussion of treatment
facility selection in Section 2 and the design guidance for sand
filters in Section 4.
... DETAILS
Flow-control orifice. The cistern must be equipped with an
orifice plate or other device to limit flow to the bioretention
area.
Best Uses
• In series with a
bioretention facility
to meet treatment
requirement in
limited space.
• Management of roof
runoff
• Dense urban areas
Advantages
• Storage volume can
be in any
configuration
Umltatlons
• Somewhat complex
to design, build, and
operate
• Requires head for
both cistern and
bioretention facility
Preventing mosquito harborage. Cisterns should be designed to drain completely, leaving no
standing water. Drains should be located flush with the bottom of the cistern. Alternatively--or
in addition-all entry and exit points, should be provided with traps or sealed or screened to
prevent mosquito entry. Note mosquitoes can enter through openings 1/t6" or larger and will fly
for many feet through pipes as small as 1!4".
Exclude debris. Provide leaf guards and/ or screens to prevent debris from accumulating in the
cistern.
Ensure access for maintenance. Design the cistern to allow for cleanout. Avoid creating the
need for maintenance workers to enter a confined space. Ensure the oudet orifice can be easily
accessed for cleaning and maintenance .
102 City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
~ APPLICATIONS
Shallow pondlng on a flat roof. The "cistern" storage volume can be designed in any
configuration, including simply storing rainfall on the roof where it falls and draining it away
slowly. See the County of San Diego's 85th percentile isopluvial diagrams for required average
depths.
Cistern attached to a building and draining to a planter. This arrangement allows a planter
box to be constructed with a smaller area.
Vault with pumped discharge to bloretentlon facility. In this arrangement, runoff from a
parking lot and/ or building roofs can be captured and detained underground and then pumped
to a bioretention facility on the surface. Alternatively, treatment can be accomplished with a
sand filter. See the discussion of selection of stormwater treatment facilities in Section 2.
Water harvesting or graywater reuse. It may be possible to create a site-specific design that
uses cisterns to achieve stormwater flow control, stormwater treatment, and rainwater reuse for
irrigation or indoor uses (water harvesting). Facilities must meet criteria for capturing and
treating the volume specified by Equation 4-8. This volume must be allowed to empty within 24
hours so runoff from additional storms, which may follow, is also captured and treated.
Additional volume may be required if the system also stores runoff for longer periods for reuse.
Indoor uses of non-potable water may be restricted or prohibited. Check with municipal staff.
Design Checklist for Cistern
0 Volume meets or exceeds minimum.
0 Outlet with orifice or other flow-control device restricts flow and is designed to provide a
24-hour drawdown time.
0 Outlet is piped to a bioretention facility designed to treat the maximum discharge from the
cistern orifice.
0 Cistern is designed to drain completely and/ or sealed to prevent mosquito harborage.
0 Design provides for exclusion of debris and accessibility for maintenance.
0 Overflow connected to a downstream storm drain or approved discharge point.
0 Emergency spillage will be safely conveyed overland .
103 City of Carlsbad SUSMP-January 14,2011
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GUTTER W/ LEAF GUARD
v
SECTION 4: LID DESIGN GUIDE
CISTERN
/.~~ ~~~~ S~ ~NT roR
, 1 AND ACCOMODATE FOR
' I 1 POSSIBI.£ OVERFLOW.
BOX
TO DRY WELL
:1.. OVERFLOW OUTLET CAP!afY SHAll EQUAL OR EXCEED
POTENTIAL RUNOFF VOLUME NjD RATE.
3. CISTERN PROVIDES FLOW CONTROL ONLY. USE IN
COMBINATION WITH TREATMENT
IIIP.
~. PROVIDE ACCESS FOR CLEAN DlfT OF Ol1Tl£T ORIFlCE. SEE
FLOW-THROUGH PlNITER OUTLET DETAIL
5. PREVENT MOSQUrrD BREEDING BY SEAUNG OR SCREENING ALL
OPENINGS TO THE WATER
SURFACE AND/OR ENSURE
COMPL£TE DRAINAGE.
UNIFORMLY .... ~--"=·y FlU. (TYP.)
iL_ _________________ D_R_Y_WE ___ L_L ________________ ~
104 City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
Flow-through planters treat and detain runoff without allowing seepage
into the underlying soil. They can be used next to buildings and on slopes
where stability might be affected by adding soil moisture.
Flow-through planters typically receive runoff via downspouts leading
from the roofs of adjacent buildings. However, they can also be set in-
ground and receive sheet flow from adjacent paved areas.
Pollutants are removed as runoff passes through the soil layer and is
collected in an underlying layer of gravel or drain rock. A perforated-pipe
underdrain is typically connected to a storm drain or other discharge
point. An overflow inlet conveys flows which exceed the capacity of the
planter .
._ CRITERIA
Best Uses
• Management of roof
runoff
• Next to buildings
• Dense urban areas
• Where infiltration is
not desired
Advantages
• Can be used next to
structures
• Versatile
• Can be any shape
• Low maintenance
Limitations
• Can be used for
flow-control only on
sites with "C" and
''D" soils
• Requires underdrain
• Requires 3-4 feet of
head
Treatment only. For development projects subject only to runoff treatment requirements, the
following criteria apply:
Parameter
Soil mix depth
Soil mix minimum percolation
rate
Criterion
18 inches minimum
5 inches per hour minimum sustained
(1 0 inches per hour initial rate
recommended)
94 City of Carlsbad SUSMP-.January 14, 2011
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Parameter
Soil mix surface area
Surface reservoir depth
Underdrain
.... DETAILS
SECTION 4: LID DESIGN GUIDE
Criterion
0.04 times tributary impervious area (or
equivalent)
6" minimum; may be sloped to 4"
where adjoining walkways.
Typically used. Perforated pipe
embedded in gravel ("Class 2
permeable" recommended), connected
to storm drain or other accepted
discharge point.
Configuration. The planter must be levd. To avoid standing water in the subsurface layer, set
the perforated pipe underdrain and orifice as nearly flush with the planter bottom as possible.
Inlets. Protect plantings &om high-vdocity flows by adding rocks or other energy-dissipating
structures at downspouts and other inlets.
Soil mix. The required soil mix is similar to a loamy sand. It must maintain a nurumum
percolation rate of 5" per hour throughout the life of the facility, and it must be suitable for
maintaining plant life. Typically, on-site soils will not be suitable due to clay content .
Gravel storage and drainage layer. "Class 2 permeable," Caltrans specification 68-1.025, is
recommended. Open-graded crushed rock, washed, may be used, but requires 4"-6" of washed
pea gravel be substituted at the top of the crushed rock layer. Do not use filter fabric to
separate the soil mix &om the gravd drainage layer.
Emergency overflow. The planter design and installation should anticipate extreme events and
potential clogging of the overflow and route emergency overflows safely.
.... APPLICATIONS
Adjacent to buildings. Flow-through planters may be located adjacent to buildings, where the
planter vegetation can soften the visual effect of the building wall. A setback with a raised
planter box may be appropriate even in some neo-traditional pedestrian-oriented urban
streetscapes.
At plaza level. Flow-through planters have been successfully incorporated into podium-style
developments, with the planters placed on the plaza level and receiving runoff from the tower
roofs above. Runoff from the plaza level is typically managed separately by additional flow-
through planters or bioretention facilities located at street levd.
Steep slopes. Flow-through planters provide a means to detain and treat runoff on slopes that
cannot accept infiltration &om a bioretention facility. The planter can be built into the slope
similar to a retaining wall. The design should consider the need to access the planter for periodic
95 City of Carlsbad SUSMP-January 14,2011
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SECTION 4: LID DESIGN GUIDE
maintenance. Flows from the planter underdrain and overflow must be directed in accordance
with local requirements. It is sometimes possible to disperse these flows to the downgradient
hillside.
Flow-through planter on the plaza levd of a podium-style development
96
_,----~
( 'f/.
i :
·~· ··---··:1·.' \
L
Flow-through planter built into a hillside. Flows from the tmdenlnin and
ov<:rflow must be directed in accordance with local n:quiranents.
City of Carlsbad SUSMP-January 14, 2011
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SECTION 4: LID DESIGN GUIDE
Design Checklist for Flow-through Planter
c:J Reservoir depth is 4-6" minimum.
c:J 18" depth "loamy sand" soil mix with minimum long-term infiltration rate of 5" /hour.
c:J Area of soil mix meets or exceeds minimum.
c:J "Class 2 perm" drainage layer.
D No filter fabric.
c:J Perforated pipe underdrain with outlet located flush or nearly flush with planter bottom.
Connection with sufficient head to storm drain or discharge point.
c:J Underdrain has a clean-out port consisting of a vertical, rigid, non-perforated PVC pipe,
with a minimum diameter of 6 inches and a watertight cap.
c:J Overflow connected to a downstream storm drain or approved discharge point .
c:J Location and footprint of facility are shown on site plan and landscaping plan.
c:J Planter is set level.
c:J Emergency spillage will be safely conveyed overland.
D Plantings are suitable to the climate and a well-drained soil.
c:J Irrigation system with connection to water supply .
97 City of Carlsbad SUSMP-.lanuary 14,2011
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f-------L (VARIES)-------i
~~ !·----
lO
L
ENERGY DISSIPATlON
OOWNSPOUT/IILET
ONE-WAY
CONNECT10NS
NOTES:
DOWNSPOUT/fiLET
V~T FABRICATED FR011 GALVANIZED STEEL BOLTED
10 111E PLANTER INTERIOR (SEE FLOW-111ROUGH
PlANTER OU11..ET DETAIL}
SECTION
N.T.S.
1 • FLOW-lHROUGH PlANTER SHAU. BE SIZED 10 MEET
CCCWP CRITERIA FOR TII£An.tENT AND/OR FLOW CONTROL
2. MINIMUM SURFACE AIREA OF PlANTER IS 4111 OF TRIBUTARY IMPERVIOUS AREA FOR TREAn.tENT ONLY DESIGN. FOR FLOW CONTROL AND TREAn.tENT,
REFER TO CCCWP SIZIIG TOOL CRITERIA.
3. SHAPE OF PLANTER CAN VARY 10 MEET PROJECT
DESIGN REQUIREMENTS AND LOCATION.
4. CLASS 2 P£NNEABLE MATERIAL
5. DOWNSPDUTS/IILET PFES REQURE ENERGY DISSIPATION.
6. USE COIJNTY API'!IOVED IODOfTM: MIXlllRE FOR WATERPROOFING CONCRETE.
7. PLANTlNGS: SEE CCCWP RECONMENDED PLANT UST AND GUIDELIIES.
8. PLANTER D£SIGN MAY REQUIRE STRUCTURAL ENGINEERING DESIGN.
9. MEA • W • L (ABOVE). EXCUJOES AREA OF VAULT
CONCRETE OR 0111ER
STRUCTURAL PLANTER WALL WITH WAlERPROOFIIG
PLANTER 0UTL.tr
(SEE FLOW-111ROUGH PLANTER
OUTLET DETAIL)
FORM A u;• GROOIIE IN CONCRETE AND PROI/IDE A
CONTlNUOUS WATERllGHT CONNECTION, USING AN
APPROVED SEAI»>T
Flow-Through Planter Detail
98 City of Carlsbad SUSMP-January 14, 2011
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ATTACHMENT F
LID FACT SHEETS
•
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The County of San Diego LID Appendix
• Potential for multiple uses including flood control basins; parks, playing fields,
and tennis courts; open space; overflow parking lots.
DESIGN
• Coordinate pond design, location, and use with local municipal public
works department and/or county flood control department to reduce
potential downstream flooding.
• Default conditions for safety have been to fence basins with chain link.
Consider aesthetic design elements with safety analyst to address pond
barriers, such as fencing and/or vegetation, and shallow side slopes (8: 1 to 12:1 ).
• See County of San Diego Drainage Design Manual
MAINTENANCE
• Regular inspection during wet season for sediment buildup and clogging of inlets
and outlets (designing a fore bay to trap sediment can decrease frequency of
required maintenance, as maintenance efforts are concentrated towards a smaller
area of the basin and less disruptive than complete basin cleaning).
• Clean inlet trash rack and outlet standpipe as necessary.
• Clean out basin sediment approximately once per year (this may vary depending
on pond depth and design, and if fore bay is used).
• Mow and maintain pond vegetation, replant or reseed as necessary to
control erosion .
LIMITATIONS
• Limitation of available space.
• Dry detention ponds have only moderate pollutant removal when compared to
some other structural treatment controls and are relatively ineffective at removing
soluble pollutants.
• Basins must be designed with vector control (max 72 hour residence time),
sediment and vegetation remova1/maintenance considerations in mind.
• Not suitable on sites with steep slopes.
ECONOMICS
• Least expensive stormwater quality pond option available. 0-25% additional cost
when added to conventional stormwater detention facilities.
• Construction cost $0.10-$5.00 per cubic foot of storage (savings from
preparing silt basins used during construction for use as extended
detention ponds).
• Maintenance cost 3-5% of construction cost annually.
REFERENCES
• California Stormwater Quality Association. (2003, January) California
Stormwater BMP Handbook: New Development and Redevelopment.
• For additional information pertaining to extended detention ponds, see the works
cited in the San Diego County LID Literature Index .
Final -35-12/31/2007
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The County of San Diego LID Appendix
Fact Sheet 4. Vegetated Swale I Rock Swale
I~
~.'Ck "J:f diaipltar3
r--.---rreeboard
Scslkm At Clw;k Dam
c.,.,_,.__ .u...-...... .tJPl>M .• ISM/frirt~M< ""9' 1r ~ftr,..,.,qp/latJM.ll1lr<INI ~,.~
Vegetated I rock swales are vegetated or rock lined earthen channels that collect, convey,
and filter site water runoff and remove pollutants. Swales are an alternative to lined
channels and pipes; configuration and setting are unique to each site.
CHARACTERISTICS
• If properly designed and maintained, swales can last for at least 50 years .
• Can be used in all soil types, natural or amended.
• When swales are not holding water, they appear as a typical landscaped area.
• Water is filtered by vegetation/rocks and pollutants are removed by
infiltration into the subsurface of the soil.
• Swales also serve to delay runoff peaks by reducing flow velocities.
APPLICATION
• Swales are most effective in removing coarse to medium sized sediments.
• Parking lot medians, perimeters of impervious pavements.
• Street and highway medians, edges (in lieu of curb and gutter, where appropriate).
• In combination with constructed treatment systems or sand filters.
DESIGN
• Vegetation of each swale is unique to the setting, function, climate, geology, and
character of each site and climatic condition.
• Can be designed with natural or amended soils, depending on the infiltration rate
provided by the natural condition versus the rate needed to reduce surface runoff.
• Grass swales move water more quickly than vegetated swales. A grass swale
is planted with salt grass; a vegetated swale is planted with bunch grass, shrubs or
trees.
• Rocks, gravel, boulders, and/or cobbles help slow peak velocity, allow
sedimentation, and add aesthetic value .
Final -36-12/31/2007
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The County of San Diego LID Appendix
• Pollutant removal effectiveness can be maximized by increasing residence time of
water in swale using weirs or check dams.
• Swales are often used as an alternative to curbs and gutters along roadways, but
can also be used to convey stormwater flows in recreation areas and parking lots.
• Calculations should also be provided proving the swale capable of safely
conveying the 1 00-year flow to the swale without flooding adjacent property or
infrastructure.
• See County of San Diego Drainage Design Manual for design criteria. (section
5.5) http://www.sdcounty.ca.gov/dpw/docslhydrologymanual.pdf
MAINTENANCE
• Swale maintenance includes mowing and removing clippings and litter. Vegetated
swales may require additional maintenance of plants.
• Periodically remove sediment accumulation at top of bank, in swale bed,
or behind check dams.
• Monitor for erosion and reseed grass or replace plants, erosion control netting and
mulch as necessary. Fertilize and replace vegetation well in advance of rainy
season to minimize water quality degradation.
• Regular inspections and maintenance is required during the establishment period.
LIMITATIONS
• Only suitable for grades between 1% and 6%; when greater than 2.5% should be
paired with weir or check dam.
• "Turf' swales will commonly require irrigation and may not meet State water
conservation goals.
• Irrigated vegetation is not appropriate in certain sites. Xeriscape techniques,
natural stone and rock linings should be used as an alternative to turf.
• Wider road corridors may be required to incorporate swales.
• Contributing drainage areas should be sized to meet the stormwater management
objective given the amount of flow that will be produced.
• When contributing flow could cause formation of low-flow channel, channel
dividers must be constructed to direct flow and prevent erosion.
ECONOMICS
• Estimated grass swale construction cost per linear foot $4.50-$8.50 (from seed)
to $15-20 (from sod), compare to $2 per inch of diameter underground pipe e.g., a
12" pipe would cost $24 per linear foot).
• $0.75 annual maintenance cost per linear foot
REFERENCES
• CAL TRANS-Storm Water Handbook (cabmphandbooks.com)
• For additional information pertaining to Swales, see the works cited in the San
Diego County LID Literature Index .
Final -37-12/31/2007
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The County of San Diego LID Appendix
Fact Sheet 5. Vegetated Filter Strips
A filter strip (or "buffer strip") is an area of either planted or native vegetation, situated
between a potential, pollutant-source area and a surface-water body that receives runoff.
Vegetated filter strips are broad sloped open vegetated areas that accept shallow runoff
from surrounding areas as distributed sheet flow.
CHARACTERlSICS
• Can serve to remove sediments by filtration through the vegetation, reducing
runoff volumes, and delaying runoff peaks by reducing flow velocities.
• A properly designed and operating filter strip provides water-quality protection by
reducing the amount of sediment, organic matter, nutrients and pesticides in the
runoff at the edge of the field, and before the runoff enters the surface-water body.
• Filter strips also provide localized erosion protection since the vegetation covers
an area of soil that otherwise might have a high erosion potential.
• Often constructed along road, parking-lot, stream, lake, pond or sinkhole
boundaries, filter strips installed on cropland not only help remove pollutants
from runoff, but also serve as habitat for wildlife.
APPLICATION
• Most effective in removing coarse to medium sediments and attached pollutants
(such as nutrients, free oils/grease and metals) .
• Typically used in conjunction with swales as an alternative to curb and gutter and
can form part of a multi-use corridor.
• Typically used as a pre-treatment for other stormwater treatment devices
(treatment train).
DESIGN
• The proper application of a filter strip should consider the type and quantity of the
potential pollutant (sediment, nutrient, pesticide, organic matter, etc.), soil
characteristics (clay and organic matter content, infiltration rate, permeability,
etc.), slope steepness, shape and area of the field draining into the filter.
• Can be designed with natural or amended soils, depending on the infiltration rate
provided by the natural condition versus the rate needed to reduce surface runoff.
• Most effective when used on gradually sloping areas
• The type of vegetation most suitable for the site should be decided based on soil
type, potential pollutant sources/types, infiltration needs, etc.
• Once the type of vegetation is selected, soil fertility should be evaluated, and the
seeding method selected.
MAINTENANCE
• Filter strips must be inspected after intense rainfall events and runoff events of
long duration because small breaks in the sod and small erosion channels quickly
become large problems .
Final -38-12/31/2007
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The County of San Diego LID Appendix
• Minimize the development of erosion channels within the filter. Even small
channels may allow much of the runoff from the field to bypass the filter. These
areas should be repaired and reseeded immediately to help ensure proper flow of
runoffthrough the filter.
• Periodic soil testing should occur and soil amendments should be applied as
needed.
• Weeding may be necessary to reduce or eliminate weeds that could compromise
the filter strip's effectiveness.
LIMITATIONS
• "Turf' buffer strips will commonly require irrigation and may not meet State
water conservation goals.
• Irrigated vegetation may not be appropriate in certain sites. Xeriscape techniques,
natural stone and rock linings can be used as an alternative to turf.
• Requires adequate sunlight for plant growth
• Effectiveness is dependant on soil characteristics, slope steepness, landscape
shape, the ratio of the filter area to the area generating the runoff, filter width, and
the type and quality of the vegetation in the filter.
• Regular inspections and maintenance is required, particularly during the
establishment period.
• Requires sufficient· space and designed large enough to meet the stormwater
management objective given the amount of flow that will be produced .
ECONOMICS
• Installation costs for filter strips may be estimated by considering the amount of
grading, seeding, and establishment required for the site. Filter strip installation
costs are similar to those of vegetative swales, and typically lower than costs for
bioretention swales with soil amendment or sand media filtration devices (2003
CASQA Development Handbook Tables 5-4 and 5-5).
REFERENCES
• California Stormwater Quality Association. (2003, January) California
Stormwater BMP Handbook: New Development and Redevelopment.
• Leeds, R., Brown, L. C., Sulc, M. R., VanLieshout, L, (n. d.) Vegetated Filter
Strips: Application, Installation, and Maintenance. Food, Agriculture and
Biological Engineering. Ohio State University Extension.
http:/ /ohioline.osu.edu/aex-fact/0467 .htmlO
• URS Australia Pty Ltd, (2004, May), Water Sensitive Urban Design: Technical
Guidelines for Western Sydney, Upper Parramatta River Catchment Trust.
Section 3.
• Southeastern Wisconsin Regional Planning Commission (1991). Costs ofUrban
Nonpoint Source Water Pollution Control Measures. Technical Report No. 31.
Southeastern Wisconsin Regional Planning Commission, Waukesha, WI.
• For additional information pertaining to Filter Strips, see the works cited in the
San Diego County LID Literature Index .
Final -39-12/31/2007
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The County of San Diego LID Appendix
Fact Sheet 7. Bioretention Systems
Typical Bioretention cross section, Anatomy of a Rain Garden, n.d.
Bioretention systems are essentially a surface and sub-surface water filtration system. In
function they are similar to sand filters. Bioretention systems incorporate both plants and
underlying filter soils for removal of contaminants. These facilities normally consist of a
treatment train approach: filter strip, sand bed, ponding area, organic layer, planting soil,
and plants.
CHARACTERISICS
• Effective in removing sediments and attached pollutants by filtration through
surface vegetation, ground cover and underlying filter media layer
• Delay runoff peaks by providing retention capacity and reducing flow velocities.
• Vegetation increases aesthetic value while also enhancing filtration capacity and
helping to maintain the porosity of the filter media.
• Can be constructed as either large or small scale devices, with native or amended
soils.
• Small scale units are usually located in a residential planter box that filters
collected stormwater through the filter media and to an outlet.
• Larger scale devices work on the same methodology, however are generally
located along the streetscapes and retarding basins over large open areas.
• In addition, there are two main types of bioretention system: Non-conveyance
systems, which generally pond runoff volume, and Conveyance, which generally
convey minor storm events along longitudinal channels. Such conveyance
systems generally include an amended soil layer under the surface for additional
storage and filtration
APPLICATION
• Effective in removing medium to fme size sediments and attached pollutants
(such as nutrients, free oils/grease and metals), but typically have higher pollutant
Final -42-12/31/2007
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The County of San Diego LID Appendix
removal efficiencies for a wider range of contaminants due to enhanced
filtration/biological processes associated with the surface vegetation.
• Best suited to small residential, commercial, and industrial developments with
high percentages of impervious areas, including parking lots, high density
residential housing, and roadways.
• Aesthetic benefits due to the surface vegetation make bioretention systems
appealing for incorporation into streetscape and general landscape features.
DESIGN
• Provide a gentle slope for overland flow and adequate water storage. No water
should be allowed to pond in the bioretention system for longer than 72 hours.
• Usually designed in conjunction with swales and other devices upstream so as to
reduce filter clogging and provide water treatment (treatment train).
• Filter media employed is usually the plant growing material, which may comprise
soil, sand and peat mixtures.
• "Planting box" type systems should be restricted to very small catchment areas.
• A subdrain system should be included in urban areas along with associated
cleanout to facilitate maintenance.
• For more precise design techniques, see: CASQA (2003, January) California
Stormwater BMP Handbook: New Development and Redevelopment
MAINTENANCE
• Generally, only routine periodic maintenance typical of any landscaped area
(mulching, plant replacement, pruning, weeding) is necessary.
• Regular inspections and maintenance are particularly important during the
vegetation establishment period.
• Routine maintenance should include a biannual health evaluation of the trees and
shrubs and subsequent removal of any dead or diseased vegetation.
• Other potential tasks include soil pH regulation, erosion repair at inflow points,
mulch replenishment, unclogging the under-drain, and repairing overflow
structures.
LIMITATIONS
• Adequate sunlight is required for vegetation growth.
• The use of irrigation may not meet State water conservation goals. Appropriate
drought-tolerant plants should be considered.
• Placement may be limited by the need for upstream pre-treatment so as to avoid
filter clogging (treatment train).
• Contributing drainage area should be less than 1 acre for small-scale, on-lot
devices
• Bioretention (a BMP with incidental infiltration) is not an appropriate BMP when:
o the seasonal high groundwater table is within 6 feet of the ground surface (US EPA 1999)
o at locations where or where surrounding soil stratum is unstable
• exceptions to the 6 foot separation can be made when:
Final
o the BMP is designed with an under-drain and approved by a qualified licensed
professional, or when:
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o written approval of a separation in the interval of 4-6 feet has been obtained by the
Regional Water Quality Control Board and the Department of Environmental Health.
• Site must contain sufficient elevation relief so that subdrain system may discharge
to receiving swale, curb or storm drain system.
ECONOMICS
• Construction cost estimates for a bioretention area are slightly greater than those
for the required landscaping for a new development (EPA, 1999).
• The operation and maintenance costs for a bioretention facility will be
comparable to those oftypicallandscaping required for a site. (CASQA, 2003)
• Maintenance costs are projected at 5-7% of the construction cost annually.
REFERENCES
• California Stormwater Quality Association. (2003, January) California
Stormwater BMP Handbook: New Development and Redevelopment.
• URS Australia Pty Ltd, (2004, May), Water Sensitive Urban Design: Technical
Guidelines for Western Sydney, Upper Parramatta River Catchment Trust.
• US EPA (1999, September) BMP Fact Sheet 832-F-99-012.
http://www .epa. gov /owm/mtblbiortn.pdf
• US EPA (1999, August) Preliminary Studies: Preliminary Data Summary of
Urban Stormwater Best Management Practices. EPA-821-R-99-012 Part D.
• For additional information pertaining to Bioretention Systems, see the works cited
in the San Diego County LID Literature Index .
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Fact Sheet 10. Unit Pavers
,....-------Stone pam,
-----1/8·-2. joiftt depeftd~ on use
There are a variety of unit paver types that provide a pervious ground surface suitable for
a variety of applications. Open celled unit pavers (turf block), brick paving, natural stone
pavers, and solid pre-cast concrete unit pavers are all examples of unit pavers that can
provide an attractive pavement with the added benefit of decreasing a development's . . rmperv10us area.
CHARACTERISTICS
• Units vary in size, weight, surface characteristics, strength, durability,
proportion of open area, interlocking capability, runoff characteristics, and cost.
• Units can be filled with gravel, stone, or salt grass turf.
• Turf units require deep-rooted grass species that can penetrate reservoir base
course.
• Curbs and gutters are generally not necessary to control low flow.
• Runoff coefficient is generally between 0.13 and 0.8, but varies depending on
rainfall intensity, joint spacing and paver type.
• Permeability is directly related to the permeability of the subgrade.
• Reduces impervious land coverage.
• Pavers are available in a variety of materials of varying colors, textures, shapes
and finishes.
• Load bearing capacity is dependant upon the type of paver used.
APPLICATION
• Application varies based upon paver type.
• Areas of low flow traffic and infrequent parking such as residential
driveways, overflow parking areas, fire/ emergency access roads, utility
roads, pedestrian paths and jogging trails, and street shoulders are appropriate
locations for turf block.
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• Brick pavers, concrete pavers and natural stone pavers are generally suitable for
driveways, walkways, patios, public sidewalks, parking lots, plazas, and low
volume streets.
DESIGN
• Flat sites (slope< 5%) with uniform, permeable subgrade.
• To maximize permeability, use an open-graded crushed rock base course in
reservoir design (not rounded pea gravels or fines).
• Subgrade must be designed for anticipated loads.
• Provide under drain system where there are no deep permeable soils.
• A void using permeable pavers in areas with underground utilities. If it is
necessary to use permeable pavers in these areas, care must be taken to keep
infiltrated water form migrating into utility trench bedding.
• Because bricks and natural stone are laid loose, the field for these pavers must be
enclosed by a rigid frame. Concrete, mortared brick on a concrete grade beam,
redwood header, and metal edging are commonly used.
• Erosion and sediment introduction from surrounding areas must be strictly
controlled during and after construction to prevent clogging of void spaces in base
material and permeable surface.
• Runoff should enter the system after pre-treatment through other treatment train
controls (i.e. buffer strips, drainage swales, etc.).
• Filter fabric should be placed on the bottom and sides of the subbase layer .
• Permeable pavers should be the last element installed during construction
or redevelopment.
• Utilization of correct design specifications is essential for adequate infiltration,
storage, and structural integrity of permeable paving systems.
• Contractors should be trained and have experience with installation.
MAINTENANCE
• Longevity ensured by locating in low erosion conditions, quality construction, and
installation of good base layer.
• Easy to repair, since units are easily lifted and reset.
• Periodically add joint material (i.e. sand) to replace material that has been moved
or worn by traffic or weather.
• Occasional weed suppression may be required.
• Turf units may need occasional reseeding and have similar maintenance of a
regular lawn, requiring mowing, fertilization, and irrigation.
• Concrete pavers should not be washed to remove debris and sediment in the
openings between pavers, rather sweeping with suction should be utilized.
• Pavers can be removed individually and replaced when utility work is needed.
• Top course aggregate can be removed or replaced in open-celled unit paving
systems if they become clogged or contaminated.
• In open-celled unit pavers, grid segments should be replaced when three or
more adjacent rings are broken or damaged.
• Must not be sealed with non-porous materials .
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LIMITATIONS
• Concrete block is bulkier with smaller openings for soil and infiltration. The
concrete draws the moisture out of the soil which tends to dry out the grass in hot,
dry weather.
• Turf swales will commonly require irrigation and may not meet State water
conservation goals.
• Irrigated vegetation is not appropriate in certain sites. GraveVrock fill may be
necessary in these sites.
• Permeability is directly related to the permeability of the sub grade.
• Some paver types are not suitable for all day parking, heavy use or areas with
turning movements because grass gets insufficient sun for optimal growth or is
suppressed by constant abrasion.
• A void using permeable pavements in close proximity to underground utilities. If
it is necessary to use permeable pavements in these areas, care must be taken to
keep infiltrated water form migrating into utility trench bedding.
• Due to the irregular surface area that can occur with permeable pavers, permeable
pavers shouldn't be considered for disabled parking spaces and walkways.
• Areas with high water tables, impermeable soil layers, or shallow depth to
bedrock may not be suitable as infiltration areas with an open-graded base.
• Not recommended in areas with high grease or oil loads, such as near restaurant
waste disposal areas, gas stations and truck stops .
• Not recommended in areas where high sediment loads are deposited on the
surface, such as downslope of steep, erosion-prone areas.
• Modular blocks are not recommended for slopes exceeding 10 percent.
ECONOMICS
• $4-$25 per square foot, installed, depending on paver type used.
• Generally more expensive than concrete or asphalt pavements.
• The cost of concrete unit pavers is generally the lowest of all unit pavers, though
it can vary depending on shipping, special colors or finishes.
REFERENCES
• Guadalupe River Project, San Jose, CA. Emergency access/frre lane.
• University of Miami Orange Bowl Stadium, Miami, FL. Parking lot with asphalt
aisles, and turf block stalls,
• Ferguson, Bruce K. (2005). Porous Pavements: Integrative studies in water
management and land development. CRC Press, Boca Raton, Florida.
• For additional information pertaining to Unit Pavers, see the works cited in the
San Diego County LID Literature Index .
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Fact Sheet 11. Subsurface Reservoir Bed
From the County of San Diego, Department of General Services, Penneable Pavement Study.
Stone reservoir recharge beds underneath parking lots are beds of open-graded crushed
stone that receive and store water for infiltration.
CHARACTERISTICS
• Underground system eliminates the possibilities of mud, mosquitoes and safety
hazards sometimes associated with ephemeral surface drainage.
• Provides for storage of large volumes of runoff, which is directed underground by
means of permeable pavements or perforated distribution pipes.
• Plastic domed stormwater chambers can be used to increase the capacity of a
recharge bed.
• Constraints include soil infiltration rates, depth to water table and bedrock, and
traffic type and volume.
APPLICATION
• Underneath parking lots generally in areas where land values are high and the
need to control runoff is great.
DESIGN
• Recharge and storage basin of clean open-graded crushed stone with 40% void
space.
• Filter fabric placed on floor and sides of recharge bed following
excavation allows water to pass readily, but prevents soil fines from migrating up
into rock basin, reducing effective storage area of recharge bed.
• Water can be directed to recharge beds via permeable pavement and/or a storm
drain system discharging through perforated pipes.
• Soil layer of 4 feet or more with percolation rate of 0.5 inches per hour or more
required; must be field tested.
• Direct all sediment-laden runoff from impervious surfaces (e.g., roof tops, roads,
parking areas, walkways, etc) away from permeable pavement/recharge bed or
pretreat to eliminate sedimentation.
• Prevent failures by implementing strict erosion/sediment control during
construction.
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MAINTENANCE
• Vacuum sweeping or pressure hosing recommended.
LIMITATIONS
• Avoid using permeable pavements in close proximity to underground utilities. If
it is necessary to use permeable pavements in these areas, care must be taken to
keep infiltrated water form migrating into utility trench bedding.
• Not applicable where the seasonal high groundwater table is closer than 10 feet
below the bottom of the gravel subbase unless designed with an under-drain.
ECONOMICS
• Accurate economic data pertaining to the use of subsurface reservoir beds is
currently unavailable, however, site specific cost records can be found in the LID
Literature Index.
REFERENCES
• Morris Arboretum, Philadelphia, P A.
• Automatic Data Processing corporate offices, Philadelphia, P A.
• Ferguson, Bruce K. (2005). Porous Pavements: Integrative studies in water
management and land development. CRC Press, Boca Raton, Florida.
• For additional information pertaining to Permeable Pavement Recharge Beds, see
the works cited in the San Diego County LID Literature Index .
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Fact Sheet 12. Crushed Aggregate (gravel)
'------Subgmde
A variety of crushed aggregates, generally known as gravel, can be used to form a
permeable pavement. Found in a variety of settings ranging from Parisian cafes to
Japanese ceremonial gardens to rural roadways, crushed aggregate is a versatile,
economical permeable pavement material with a long history of use.
CHARACTERISTICS
• A granular material, crushed aggregate can be laid in any shape field or
configuration.
• Runoff coefficient: 0.10 -0.40". Pavements of fine crushed stone (e.g .
decomposed granite fines) are relatively impermeable. Permeability
increases with larger aggregate sizes. Open-graded mixes are more permeable
than mixes that include fines.
• Easy to install.
• Reduces impervious land coverage.
APPLICATION
• Low volume and low speed vehicle traffic areas.
• Parking stalls, private driveways, walkways, and patios.
• Areas of low erosion.
• Not appropriate for ADA-compliant accessible paths of travel.
• Flat sites (slope< 5%) with uniform, permeable subgrade.
DESIGN
• Because the aggregate is laid loose, the field must be enclosed by a rigid frame in
most applications. Concrete, mortared brick on a concrete grade beam, redwood
header, and metal edging are commonly used.
• To maximize permeability, use an open-graded crushed rock base course (not
rounded pea gravels or fmes).
• In areas with pedestrian traffic, use smaller aggregate (3/8" size).
Larger aggregate (3/4" size) makes a better driving surface .
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MAINTENANCE
• Longevity ensured by locating in low erosion conditions, quality construction, and
installation of good base layer.
• Easy to repair since aggregate is easily re-graded and replenished.
• Occasional weed suppression may be required.
• To maximize permeability, minimize compaction ofsubgrade.
• Periodic and/or replenishing, raking of displaced gravel may be required.
LIMITATIONS
• Dust Control
• Not appropriate for ADA-compliant accessible paths of travel.
• Restrict heavy vehicle and equipment loading to prevent compaction of
underlying soils when not used in conjunction with the recommended base course.
• Because the aggregate is laid loose, the field must be enclosed by a rigid frame in
most applications.
• A void using permeable pavements in close proximity to underground utilities. If
it is necessary to use permeable pavements in these areas, care must be taken to
keep infiltrated water form migrating into utility trench bedding.
ECONOMICS
• Less expensive than conventional asphalt or concrete pavement.
• Least expensive of all pavements, ranging from $1 to $3 per square foot.
• Reduced impervious land coverage reduces or eliminates need for catch
basins/ underground storm drain system.
REFERENCES
• Ferguson, Bruce K. (2005). Porous Pavements: Integrative studies in water
management and land development. CRC Press, Boca Raton, Florida.
• For additional information pertaining to Crushed Aggregate, see the works cited
in the San Diego County LID Literature Index .
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Fact Sheet 13. Cobbles
'------Subgtode
Larger granular materials are known as cobbles. Cobbles do not make a suitable surface
for walking or vehicular traffic, but are useful as a permeable pavement in areas where
little traffic is desired, such as under large trees, or in hard to maintain areas, such as
median islands. Cobbles have similar construction characteristics as gravel, except they
are somewhat more labor intensive to install because each cobble must generally be set
individually.
CHARACTERISTICS
• Can be laid in a field of any shape or configuration with or without base.
• Material varies in color, shape, and size.
• Runoff coefficient: 0.60 -0.90"; higher for larger sizes.
• Easy to install .
• Reduces impervious land coverage.
APPLICATION
• Commonly used around bases of trees in lawn areas and garden areas
• Commonly used in parkway planter strips and median islands.
• Commonly used with decorative mulch in landscaped areas.
DESIGN
• Rigid edges such as concrete, brick, wood or metal band is useful to keep cobbles
in place.
• To maximize permeability, use an open-graded crushed rock base course (not
rounded pea gravels or fmes).
• Diameters range from 4" to 8".
• A permeable filter fabric may be provided under the cobbles to suppress weeds
and minimize migration of soil.
MAINTENANCE
• Periodic weed suppression may be required.
• Resetting or replacement of cobbles may be required periodically.
LIMITATIONS
• Not suitable for walkway surface or vehicular traffic
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• Labor intensive to install because they have to be set individually
• Resetting or replacement of cobbles may be required
• Weed growth and sediment accumulation can impede permeability
ECONOMICS
• Easy to remove/reinstall
• Cost varies widely depending on material. Washed river rock is less costly than
angular granite cobbles.
REFERENCES
• Ferguson, Bruce K. (2005). Porous Pavements: Integrative studies in water
management and land development. CRC Press, Boca Raton, Florida.
• For additional information pertaining to Cobbles, see the works cited in the San
Diego County LID Literature Index .
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Fact Sheet 18. Rural Swale Systems
Culwlrt under intersection ------.
V~ SWCllo or g!'IMII shoulder
Rural swale systems are a combination of street design elements that allow for surface
drainage while simultaneously protecting the roadway edge, organizing parking, and
allowing for driveway access and pedestrian circulation. Generally consist of street sheet
flows being directed to a vegetated swale or gravel shoulder, curbs only at street comers,
and culverts under driveways and street crossings
CHARACTERISTICS
• Shoulder can be designed to accommodate parking or to serve as a linear swale,
permitting infiltration of stormwater along its entire length.
• Runoff from the street is not concentrated, but dispersed along its entire length,
and build-up of pollutants in the soil is minimized.
APPLICATION
• Differing systems can be applied depending on the local characteristics, needs and
zoning standards.
DESIGN
• Concrete curb and gutter not required.
• Ensure that culverts under intersections drain, to avoid standing water and
resulting septic condition.
• For steeper slopes, roadside swales should be protected to minimize erosion.
• Provide concrete curb at intersection radii to protect roadway edge and
landscape area from turning movements.
• Crown street to direct runoff to shoulders. If drainage is provided on one side
only, then provide cross-slope towards swale.
• Protect pavement edge with rigid header of steel, wood or a concrete band poured
flush with the street surface .
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• If parking is not desired on the shoulder, no parking signs and striping can be
used.
• Central medians can be used to divide traffic for safety or aesthetics.
MAINTENANCE
• Surface systems require periodic maintenance and inspection.
• Maintenance for surface systems is different than most urban Public
Works Departments currently practice, and employee retraining may be required.
• Surface drainage systems are easier to monitor and clear than
underground systems, because problems, when they occur, are visible and on the
surface. This eliminates the need for subsurface inspection or street excavation.
LIMITATIONS
• Design and scope is dependant upon local conditions and zoning standards.
ECONOMICS
• Surface swales are less costly to install thaiJ. underground pipe systems, but may
have higher on-going maintenance costs.
REFERENCES
• City ofFolsom, CA.
• For additional information pertaining to Rural Swale Systems, see the works cited
in the San Diego County LID Literature Index .
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1J II 1 .\'--------Ston indic:otora (optional)
lE-i ______ Conwlltional asphalt
' or cancrwl:•
c-.,..._.,llllli_t.._.,.,~.~_,._rrqotre~forr"''"'"''fl--~~nfr:<JMtll
Hybrid parking lots differentiate paving, combining impervious aisles with permeable
stalls. Impervious aisles are designed to carry moving vehicle traffic and accommodate
turning movements. Permeable stalls are designed for stationary or very slow moving
cars. There are many possible combinations of materials.
CHARACTERISTICS
• Hybrid lots can reduce the overall impervious surface coverage of a
typical double-loaded parking lot by 60%, and reduce the need for an
underground drainage system.
• Differentiation between aisles and stalls can mitigate the overall visual impact of
the parking lot.
APPLICATION
• Commercial areas, offices, multi-family housing, hotels, restaurants.
• Selection of permeable pavement material depends on use. Permeable
asphalt, pervious concrete or unit pavers are recommended for stalls in areas
with high turnover, such as restaurants. Areas with low turnover, such as
hotels, office buildings, and housing can use crushed aggregate for stalls.
• Variable permeability, depending on pavements chosen.
• High ground water or lack of deep, permeable soils may limit applications.
DESIGN
• Keep permeable pavement areas relatively flat (slope::; 5%)
• Aisles are constructed of conventional asphalt or concrete suitable for
heavier traffic use, speeds between 10 and 20 mph, and designed to support the
concentrated traffic of all vehicles using the lot.
• Stalls are constructed of a permeable pavement, such as open-graded crushed
aggregate, open-celled unit pavers, turf block, permeable asphalt, or pervious
concrete.
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• A void using permeable pavement in areas with underground utilities. If it is
necessary to use permeable pavement in these areas, care must be taken to keep
infiltrated water form migrating into utility trench bedding.
• Slope aisles into adjacent permeable stalls.
• Subdrain or overflow drainage may be required depending on design storm and
underlying soils.
• Stall markings can be indicated with wood headers laid in field of
permeable pavement, change in unit paver color, concrete bands or
pavement markers ("Botts dots"), depending on the material used.
• Designated handicapped stalls must be made of an ADA compliant pavement.
MAINTENANCE
• Periodic weed control, sweeping, and regrading required for gravel stalls.
• Irrigation, fertilizer, weed control, and mowing required for turf block
stalls. Pressure hosing or vacuum sweeping may be required for pervious
concrete or permeable asphalt stalls.
LIMITATIONS
• Limitations are related to the materials used (for example, if stalls are constructed
of crushed aggregate, the limitations associated with crushed aggregate would
apply to the hybrid parking lot).
• Space limitations and soil type might affect the types of pavements that can be
used.
ECONOMICS
• Reduction of overall impervious surface coverage may eliminate or reduce need
for underground drainage system.
• Construction cost will depend on materials chosen. A hybrid lot of
conventional asphalt aisles with crushed aggregate stalls will be lower cost than
a lot entirely paved in asphalt. A hybrid lot of conventional asphalt aisles
with unit pavers stalls will be higher cost than a lot entirely paved in asphalt.
REFERENCES
• Parking lot. Medford Village, NJ.
• For additional information pertaining to Hybrid Parking Lots, see the works cited
in the San Diego County LID Literature Index .
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Fact Sheet 22. Parking Grove
g 10 tl J +--------Concnte osphalt « concrete
~
c..._,~"*-._•,typk>ll. ~-...,., ...,.,-ftrl"'JWqpl/a!tiM. -~'",_l
Parking groves, a variation on the hybrid parking lot design, use a grid of trees and
bollards to delineate parking stalls and create a shady environment. The permeable stalls
reduce impervious land coverage while the trees reduce heat island effect and improve
soil permeability .
CHARACTERISTICS
• Parking grove not only shades parked cars, but presents an attractive open space
when cars are absent.
• Permeability depends on the type of pavement used.
• Reduces impervious land coverage.
APPLICATION
• Best in locations where the users of the parking lot are a consistent group
of people (such as multi-family housing or an office building) who become
familiar with parking between the trees.
• Best in situations where vehicles park for long periods of time, such as
hotels, housing, offices.
• Not recommended for high turnover lots, such as restaurants and
commercial areas because of additional care needed to navigate around trees.
DESIGN
• Parking stalls must be oversized to accommodate thickness ofbollards and trees.
• Set trees/bollards at least three feet in from end of stall to allow for
turning movements into and out of stall.
• Trees should be protected during the establishment period. Align stakes along
implied stall line.
• Bollards may be omitted if proper tree staking is provided during
establishment period .
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• Metal tree cages are not recommended because they are easily damaged and can
scratch cars.
• Trees should be selected for high, horizontal branching structure, and should not
be prone to limb breakage or insects that secrete honeydew.
• Provide irrigation to trees as required.
MAINTENANCE
• Requires tree pruning and maintenance to ensure clearance of vehicles.
• Trees may occasionally be damaged by cars. They should recover after
pruning, but may require replacement.
LIMITATIONS
• Limitations are related to the materials used (for example, if stalls are constructed
of crushed aggregate, the limitations associated with crushed aggregate would
apply to the hybrid parking lot).
• Space limitations and soil type might affect the types of pavements that can be
used.
ECONOMICS
• More expensive to construct and maintain than standard parking lots.
REFERENCES
• Seaside Motel Auto Court, Seaside, FL.
• City of LA, Bureau of Street Services -Street Tree Division
http://lacity.org/boss/streettree/treeguide.htm
• Street Trees Recommended for Southern California, Second Edition (1999).
Street Tree Seminar, Inc.
• For additional information pertaining to Parking Groves, see the works cited in
the San Diego County LID Literature Index .
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Fact Sheet 23. Overflow Parking
E--......,~-~_.,od---CocwentioMI asphalt or
c.....v.-.~tnrl-liti..-.,.,. 'JIIlOI. ~-""-'"' rrfiii"'Ofirl""'~·'-lfOiiii*"'JII'ifml-l.
cone me
Perlious pcMrnen~ (e_g_
crushed 0991e90te)
Overflow parking design differentiates between regular and peak parking
demands, constructing the regular demand parking stalls with traditional
impervious materials and constructing peak parking stalls of a different, more
permeable, material.
CHARACTERISTICS
• Overflow area can be pervious materials such as turf block, crushed stone, unit
pavers on sand, and can be designed to break up an expanse of
continuous parking lot.
• Permeability depends on pavement used.
APPLICATION
• Large parking lots with variable capacity needs such as shopping malls,
conference centers, office complexes, amusement parks, sport facilities.
• Visitor parking areas in multifamily residential developments or office
complexes.
• Facilities with infrequent but extensive peak parking needs, such as
churches, sports arenas, and conference centers.
DESIGN
• Must be designed to accommodate volume of overflow parking.
• In many uses, regular parking demand accounts for approximately two-thirds of
total, with one-third accommodated as overflow.
• Irrigation may be necessary if overflow parking is turf block.
MAINTENANCE
• Maintenance depends on pavement selected .
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LIMITATIONS
• Limitations are related to the materials used (for example, if stalls are constructed
of crushed aggregate, the limitations associated with crushed aggregate would
apply to the hybrid parking lot).
• Space limitations and soil type might affect the types of pavements that can be
used.
ECONOMICS
• Cost depends on pavement selected and overall design.
REFERENCES
• Gravel overflow parking at Nordstrom parking lot. Corte Madera, CA.
• Orange Bowl parking lot, FL.
• For additional information pertaining to Overflow Parking, see the works cited in
the San Diego County LID Literature Index .
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Fact Sheet 26. Rain Harvesting
r-----c-
~----Lik:tlorlocl
,-----o.to. pipe 2"1 t
~~_,)/,. r----Oul"' pipe {8lld __.) 1fr :1:
~--~ ...
----CoiiiH...., .......
'-----YaM (~ '------c:w.n .. for IQ'I
c...tt.Mw,....,...M(.w...-.trsm... ... IJPII»>. ~1119,. rtJif.fiiiNfw,...,...,fbttM.rmt~~~t~,..~
Rain harvesting reduces runoff discharged to the storm drain system and can help
conserve water in applications at all scales. Rain barrels and cisterns are storage vessels
that are directly connected with the roof downspout. Water is slowly released with either
a manually operated valve or a permanently open outlet.
CHARACTERISTICS
• Can be incorporated into the aesthetics of the building and garden.
• Reduces peak runoff and allows sediment to settle.
• Provides more infiltration benefits than connecting directly to storm drain.
APPLICATION
• New and existing residential buildings
• New and existing commercial buildings
DESIGN
• Manually operated valve can be closed to store stormwater for irrigation use or ·
infiltration between storms.
• Must be covered to prevent mosquitoes from breeding.
• Permanently open outlet must be sized appropriately.
• Size cistern for water quality volume, provide overflow for larger storms.
• For safety reasons provide secure cover or~ 4" top opening if holding more than
6" depth of water.
• Provide screen on gutter and intake of outlet pipe to minimize clogging by leaves
and other debris.
MAINTENANCE
• System requires regular monitoring and cleaning.
• Ensure system is not clogged by leaves or other debris .
Final -84-12/31/2007
•
•
•
The County of San Diego LID Appendix
LIMITATIONS
• Due to San Diego's arid climate and depending on location, rain barrels and
cisterns may fill with rain only a few times per year.
ECONOMICS
• Low installation cost.
REFERENCES
• For additional information pertaining to Cisterns and Rain Barrels, see the works
cited in the San Diego County LID Literature Index .
Final -85-12/31/2007
•
•
•
The County of San Diego LID Appendix
Fact Sheet 27. Foundation Planting
11-------.......
,------~ teal plolltt
CMIIWMr,~tml-llllr""""""'JIIkll. ~""'Jjo{Jrflil'l!lfir~Nr''~·'-"!fiiiii(W~
Landscape planting around the base of the eaves can reduce the physical impact of water
on the soil and provide a subsurface matrix of roots that encourage infiltration.
CHARACTERISTICS
• Foundation planting provides increased opportunities for stormwater infiltration.
• Planting protects the soil from erosion caused by concentrated sheet flow coming
off the roof, reducing the amount of sediment in urban runoff.
APPLICATION
• For buildings that do not use a gutter system.
DESIGN
• Locate plants at the roof drip-line.
• Select plants with high capacity for vertical water storage.
• Select plants with leaf architecture that intercepts rainwater and traps it
for eventual evaporation.
• Select plants sturdy enough to tolerate the heavy runoff sheet flows, and periodic
soil saturation.
• Provide mulch cover in planting bed to protect soil from impact of
falling rainwater and to increase soil water-holding potential.
• Protect perimeter of foundation as required by local soil conditions.
MAINTENANCE
• Regular garden maintenance.
• Gardening must occur to ensure compliance with fire codes .
Final -86-12/3112007
•
•
•
The County of San Diego LID Appendix
LIMITATIONS
• Particularly considering the frequency and ferocity of fires in San Diego County,
care must be taken to ensure that any foundation planting does not pose a
potential fire hazard for the building.
• Water infiltration near the building presents the danger of water damage to the
foundation. Depending on soil type, protect foundation with moisture barriers and
grade foundation to move water a safe distance from the building. Contact a
qualified, licensed professional before this LID technique is applied.
ECONOMICS
• Costs vary based upon plant choice, but generally can be expected to be relatively
low if planted and maintained correctly.
REFERENCES
• For additional information pertaining to Foundation Planting, see the works cited
in the San Diego County LID Literature Index .
Final -87-12/31/2007
•
•
•
The County of San Diego
Fact Sheet 28. Downspout to Swale
Discharging a roof downspout to landscaped areas
via swales allows for polishing and infiltration of
the runoff.
CHARACTERISTICS
• Runoff from the roof is directed into a
rocky or vegetated swale area.
• The water flows through swale with
overflow continuing to the storm drain.
APPLICATIONS
• Appropriate for most buildings with
landscaped areas adjacent to the building
where soil drainage is appropriate and
water infiltration does not pose a risk to
the foundation.
DESIGN
LID Appendix
• The downspout can be directly connected to a pipe which daylights some distance
from the building foundation, releasing the roof runoff into a rock lined swale
towards a landscaped area.
• The roof runoff is slowed by the rocks, absorbed by the soils and vegetation, and
remaining runoff flows away from the building foundation into the storm drain.
• Xeriscape techniques, natural stone and rock linings should be used as an
alternative to turf.
MAINTENANCE
• Maintenance is similar to that necessary for other swale areas and will depend on
the specific style chosen.
LIMITATIONS
• Only suitable for grades between 1% and 6%
• When a vegetated swale is used, the site requires adequate sunlight for vegetation
growth
• A void infiltrating too close to foundations and underground utilities.
ECONOMICS
• Costs are similar to those associated with other swale devices.
REFERENCES
• For additional information pertaining to the Downspout to Swale technique, see
the works cited in the San Diego County LID Literature Index .
Final -88-12/31/2007
•
•
•
The County of San Diego LID Appendix
Fact Sheet 32. Plant species selection for infiltration areas
c ......... ~.--l#ls....,.,.'11"'l ~,..,,.,.ipiiJMfir,.,.,~.c.-J~I""ftrrt-t.
Plant species selection for infiltration areas can improve the infiltration potential of
landscape areas as well as improve the aesthetics of design.
CHARACTERISTICS
• Deep rooted plants help to build soil porosity.
• Certain plant species and applications provide bio-remediation effects by
improving water quality.
• Leaf surface-area helps collect rainwater before it lands on the soil, especially in
light rains, increasing the overall water holding potential of the landscape.
• Select species that are tolerant of moist soils or periodic inundation, as well
as drought if planted without supplemental irrigation.
APPLICATION
• Applicable to all treatment devices that incorporate plant materials.
DESIGN
• Select appropriate plant species depending on zone of inundation: lowest, middle,
and highest.
o Lowest: Depending on size, location and drainage watershed, this area
may encounter frequent inundation, wet dry cycles or high moisture
conditions.
o Middle: Depending on size, location and drainage watershed, this area
may encounter occasional inundation and wet dry cycles.
o Highest: Depending on size, location and drainage watershed, this area
may encounter very rare inundation.
• Select the appropriate plant for the use, anticipated water inundation, habitat and
aesthetic goals.
• Consider sight-line and other requirements for parking lots and street-
side plantings .
• Include mulch cover in planting areas.
Final -95-12/31/2007
•
•
•
The County of San Diego LID Appendix
MAINTENANCE
• Maintenance can have a significant impact on soil permeability and its ability to
support plant growth. Proper mulching of the soil surface improves water
retention and infiltration, while protecting the surface root zone from temperature
extremes.
• Slightly more attention to maintenance and care of plant material may be required
than in non-infiltration areas.
LIMITATIONS
• Cool season turf grasses utilized in vegetated swales require irrigation and may
not meet state and local water conservation goals.
• Irrigated vegetation may not be appropriate in certain sites. Xeriscape techniques,
natural stone and rock linings and other inert groundcovers can be used as an
alternative to living vegetation.
ECONOMICS
• Varies based on landscaping needs.
REFERENCES
• For additional information pertaining to Species Selection for Infiitration Areas,
see the works cited section titled "Landscaping" in the San Diego County LID
Literature Index .
Final -96-12/31/2007
Verifi.ion and Inspection
of Treatment Control BMPs
All storm water BMPs should be regularly
inspected by the property owner or responsible
party to ensure continued effectiveness and
structural integrity. In addition, the City will
require private property owners to verify the
maintenance of treatment control BMPs on an
annual basis. The City has developed a
verification form for private property owners
and responsible parties to use. Verification
includes a signed statement from the property
owner or responsible party confirming that
treatment control BMP(s) have been
maintained as required. The verification form
can be submitted by fax or mail to the City and
can also be downloaded from the City's
webpage at www.carlsbadca.gov. Please note
that all private property owners are required to
maintain their treatment control BMPs and
comply with all applicable regulations outlined
in the Carlsbad Municipal Code.
aty of carlsbad
5950 El camino Real
carlsbad, CA 92008
Storm drain stenciling is an educational,
interactive tool to engage people of all ages in
community involvement for watershed
pollution prevention. It is a pollution solution
project for students and community
involvement for adults. Stencil the storm
drains that drain to the treatment control BMP
on your private property. It's a great way to
educate neighbors, residents, contractors, and
visitors about pollution prevention.
Distinguish your property as being
environmentally conscious. The City has
storm drain stencils for loan or you may
develop your own signs.
Construction Management
and Inspections
760-602-2 780
tcbmp@ci.carlsbad.ca.us
Printed on Recycled Paper
WhatYiu
Need to
Know About
Privately
Owned
Treatment Control BMPs
City of Carlsbad
Storm Water Compliance
Guidelines for
Treatment Control Best
Management Practices
What arleatment Control BMP's?
Treatment control best management practices
(BMPs) are structures or devices that help to
prevent pollutants from entering our storm drain
system They are primarily designed to provide
treatment of storm water either through storage,
filtration, or infiltration. As land is developed,
vegetation is replaced with paved surfaces and
rooftops which results in a higher potential for
storm water pollution. The intent of treatment
control BMPs is to assure that storm water runoff
from developed areas does not impact waterways.
Treatment Control BMPs can
help protect our waters ways from:
Sediments
Trash and Debris
Oil and Grease
Bacteria and Viruses
Who is responsible for maintaining
treatment control BMPs?
Maintenance of treatment control BMPs is a shared
responsibility between the City and the community.
Treatment control BMPs and other storm drain
structures on public streets and property are
maintained by the City. Private property owners are
responsible for maintaining treatment control BMPs
on their properties including keeping their portion of
the storm drain system free of trash, sediments,
excessive vegetation, and other materials that may
contribute to storm water pollution.
A Clean.,vironment Is lm
What are the most common treatment
control BMPS are found in Carlsbad?
• Drv Extended Detention Basins: Also known as
dry ponds, dry extended detention basins are
designed to hold storm water runoff while allowing
pollutants to settle out.
• Infiltration Basins: An infiltration basin is a
shallow pond that uses the natural filtering ability of
the soil to remove pollutants in storm water runoff.
Infiltration basins store runoff until it gradually
filters through the soil and eventually into the water
table. These basins have high pollutant removal
efficiency and can also help recharge groundwater
• Media Fllters: Storm water media filters are usually
two-chambered pretreatment settling devices that
include a sand filter or other absorptive filtering
media. As storm water flows into the first chamber,
large particles settle out, and then finer particles are
removed as storm water flows through the filter in
the second chamber.
• Wet Vaults: A wet vault is generally 3 to 5 feet
deep and allows storm water flows in while
constricting it at the outlet. This causes a temporary
rise of the water level and slowly releases water
while holding back pollutants.
• Vortex Separator: This treatment control BMP uses
gravity to help separate pollutants from storm water.
Vortex separators move water in a circular motion ,
rather than a straight line making, it possible to
remove a significant amount of suspended sediments
and pollutants
• Drain Inserts: They are filters or fabric placed in a
storm drain inlets to help remove sediment and
debris. There are a three main types of drain inserts;
fabric socks attached to a frame or grate of the storm
drain and filter out pollutants; boxes are plastic or
wire mesh screens that filter out large particles; and
trays hold different types of media filters that collect
trash and debris.
Be Part of the Pollution Solution!
There are several things you can do to help maintain
the treatment control BMPs on your property.
Before and after a heavy rain, please remember to:
./ Check and clean the gutters and drainage ditches
around your property. Blockages can cause
water to pond and damage your property and
parking lots.
./ Remove leaves, branches, roadside litter, weeds
or any material that can block treatment control
BMPs.
./ NEVER use a hose to clean a storm drain or
treatment control BMP. Avoid using blowers
that only displace residue. Dispose of waste and
trash properly.
./ Check the storm drains inlets to be sure they are
free of any materials and debris. Check the
drainage path and remove any debris .
./ Report any unauthorized access or illegal
dumping into drainage systems. Call the Storm
Water Hotline at 760-602-2799 to report spills
or illegal discharges .
./ You can also find information about the
treatment control BMP maintenance verification
and inspection program at www.carlsbadca.gov.
For more information or assistance, please call 760-602-2780
U)B1Q WlOlS ;jl.p U! U)B~ A[UQ lllS!i\ • lpl!~ I!UI!(OS • SO:JJey.j Ul!S • Olp!SUI!il:l() • Sl!l!UPUJ • Jey.j (<l(J • pl!qSIJIQ we.lSOJd ~eA\ WJOlS AlUOOJ 41JON In 1972, the Environmental Protection Agency developed regulations to control water pollution. As a result, the National Pollutant Discharge Elimination System (NPDES) Permit was created. NPDES permits are issued to municipalities as well as construction sites. In addition to complying with local regulations, which are governed by our municipal NPDES permit, you may be required to obtain a permit through the State of California under the State General Construction Permit (99-08-DWQ). All construction sites over one acre are required to obtain coverage under this permit. Construction sites can contribute pollutants, such as sediment, metals, and chemicals, to our local creeks, rivers, lakes, lagoons, and ocean. These pollutants make their way down our streets and into storm drains, eventually discharging to the nearest body of water. All construction sites are required to implement Best Management Practices (BMP) to prevent storm water pollution. This brochure is intended to assist your construction site in understanding BMP requirements. Each municipality has one or more persons dedicated to ensuring that all construction sites are in compliance with state and local storm water control regulations. Contact your local municipality for further information. We understand that there are times when space on construction sites is limited. If at any point, you (as a contractor or subcontractor) need to use the public right-of-way in order to work or store materials, you must apply for a special permit. This permit allows you to use the City's right-'/> : . ;n i: .................. .;,;_:..;:: .. ;..;,._.~ :;... ... .:.:..;..-...:_..~-_:: ..,;._--_;.~' of-way areas, and describes what is required to prevent illegal contaminants from entering local storm drains. For more information or to obtain a permit application contact your local jursidiction. iNSPECTION AND ENFORCEMENT PRoGRAM Each jurisdiction has established an enforcement program to ensure that all businesses operate in compliance with all appropriate storm water laws and other City requirements. Contractors, site suoervisors and property owners can be held responsible for violations, which may lead to a civil penalty of up to $10,000 per day and/or reimbursing the local jurisdiction for all associated with OV£l"JU·09l-l?lS'I.J\JOAl!J~ OlVZ·OZL·9S9 ~-j """"'"~OSJO .~>o '<:@::\): £l£6·SSl-8SQ0 JeW ta() JO ,WJ \i;;;l O!iOL#l"1J9l~ ~U2SJOA1J.:J "=" 009!i·!i[T09L ~~~~ '!~ "P!SU~iO()JOAJ!J · ·,.. '". '.Z-([9-00l A ~UI:lli]JO~J· GILt-ZO'H>OLe peq!iJJ'O JO AJ.:> :SJ;,qwnN auoqd Pl!lUCQ weJ80lc/ Jill!?M WJOlS A)Uno:J ljlJON illjl 'AtaJa:JU!S ·sa1~1unwwo:J Jno UJ aJ!l JO ~!1-enb a4~ aAOJdW! pue aAJasaJd o~ ~!l!qe a~ aAe4 aM Ja~allo1 ·sa~IS JnOA ~~~ pa~uawa1dw! aJn4:JOJq 5!4~ UJ pa~uas~Jd SdW9 a~ lluJaas o~ pJeMJOJ lfOO! aM ·~nenb Ja~-eM JO UO!Pa~oJd a~ amsua 0~ Sill!S UO!Pn~SUO:J JJa~ l!UJPadSUJ aq II!M UOJP!p5!Jnf 4:ll!] ·ueap sAeMJilli!M mo llu1daa>( ai!4M JilJSI!a qof JnOA illfi!W Ol ado4 aM 'SJOO) asa~ ~!M no,{ llu!pJAOJd AS ·pedw! JJa~ ilZJWJUJW 0) (SdW8) Sa:l!PI!Jd )Uawal!eUI!WlSag a)epdoJdd-e wawatdW! pue UOJlnnod Ja)eM asne:J m pazJullO:JaJ aJ-e ll!lp 5a!l!"'!PI! Amuap! no,{ d1a4 II!M am4:J0Jq S!~ ll!4l ado4 mo S! 11 ·am JO AeM ,sa!l!unwwm JnO l!U!U!I!lU!I!W O)JI!:lfi!J:l S! UO!lnllod llupnpaJ ~~~~ aAil!l<lq aM ·spa4SJ<lli!M JnO PillOJd 01 Ja~allol l!U!lfJOM ~uno:> olla!a u-es uJa~ou U! SUO!P!p5!Jnf JO aA!Pili!O:l I! S! (dMS)N) W!!Jl!OJd Jil)l!M WJOJS ~uno:) ljlJON <141 Construction materials such as paint, dirt and trash often find their way into our storm drains, polluting the environment and jeopardizing our creeks, rivers, lakes, lagoons, and ocean. The NCSWP is working with contractors to implementwhatare known as Best Management Practices (BMPs) on all construction sites. That is, methods used to keep pollution out of our storm drains and off public property, such as sidewalks, streets, parkways and alleys. Carrying out and maintaining these BMPs on the construction site is critical to protecting our ocean and lagoons. The following is a list of BMPs and pollution prevention measures that shall be implemented at all construction sites: 1. Conduct daily site cleanings. 2. Develop spill response and containment procedures. 3. Educate employees and subcontractors about BMPs. 4. Develop an erosion control plan for wind and rain. • • •
• • •
BEST MANAGEMENT PRACTICES
~TE~STORAGE
All building materials and fuel stored on the site must be
contained and covered. It is illegal for contractors to wash out
paint brushes in the street or dump any residues in the storm
drain. Paint brushes and spray guns must be contained and
disposed of properly.
PERIMETER CONTROLS
Gravel bags, silt fences, and straw wattles are acceptable
perimeter controls, and must be used to surround
the entire site to control run-on and run-off. Avoid
running over perimeter controls with vehicles or heavy
equipment, as they can damage the materials. Keep
extra absorbent materials and/or a wet/dry vacuum on
site to quickly pick up unintended spills. Sites must also
be checked and maintained daily.
BUILDING MATE~/STAGING AREAS
Construction materials must be stored on site at all times unless a
right-of-way permit has been obtained. Building materials should
always be covered when not in use to prevent run-off caused
by wind or rain. To apply for a right-of-way permit, contact the
appropriate department of your local jurisdiction.
0UMPSTERS/PORT ... A ... POTIY
Always cover dumpsters with a rollback tarp. Areas around dumpsters
should be swept daily. Perimeter controls should also surround
dumpsters and all Port-a-Potties. If dumpsters or Port-a-Potties are
kept on the street, right-of-way permits are needed.
TRACKING CoNTROLS
A!l entraoces and exits on the site must have coarse
gravel or steel shaker plates to limit offsite sediment
tracking.
CoNCRETE TRucKS/PuMPERS
Pumpers must be surrounded by perimeter
controls, such as gravel bags. Plastic sheets also
must be placed beneath concrete pumpers at all
times., and residual materials must be cleaned up
as well. Washout areas must be used whenever
cleaning trucks.
WASH OUT AREA
The disposal of "wet" construction materials should
be handled in the washout area. This includes paint,
stucco and concrete. Use a berm and/or plastic
sheet to collect and contain liquids and prevent
run-off in nearby areas. The washout area must be
checked and maintained daily to ensure compliance.
Washout liquids must be disposed of properly.
DIRT AND GRADING
Mounds of dirt or gravel should be stored on
site. These materials should also be covered
each day with a tarp, coconut mat, or other
form of protection. Visqueen and/or tarps
must be available and on site to cover 125%
of exposed areas during the rainy season
(October-April).
All earthmoving equipment should be stored on
site. Maintenance should also be conducted on
the site, and tracks and trails left by equipment
leading to and from the site should be cleaned up
immediately.
STORM DRAINS
Storm drains must be protected at all times
with perimeter controls, such as gravel bags
or straw wattles. Sediment accumulation
should be removed frequently.
THESE GUIDELINES ARE GENERALIZED. PLEASE CHECK SPECIFIC REQUIREMENTS WITH YOUR LOCAL JURISDICTION.
•
ATTACHMENT G
Concept Grading Plan
•
•
•
•
i .. .. ~
I ~ i i l
.! !!!-I .. s
8 ,1, 8 t t
~ i E 8-l 0 • f
f
.! ill / .5 ~ :J.
'DERN HOlES; 1. 1IIS PlAN IS CCNCEP1\IAl OIU, IT SHOilD NOT BE USED RIR PRICIIG Cll CONSTRUC1ION.
2. .11..1. -IS 10 CCIIPI.Y -11£ REtCIIIIEIIIIA110NS CE 11£ SOLS REPORT PREPMm
BY WI.£ .. loDllEl1lN EliGIIIEERING, DAlED AUGUST 17, 2001.
3. .11..1. -ll.ElS SIIIMI ON 1IIS PlAN -.
12"1112" -ll£1ll, EXttPT II 11£ DAMWAY, SEE U1lJTY PlNI, c-2.00 RIR T'IPE.
~ ~-~ FNSI£D SURFACE (FS)
s. .11..1. CUllS NIIJ CUllS .. GUT1ERS SHAU. CXJNf1lNI TO 11£ 01TY CE CARLSBAD STNilMDS.
II. .11..1. ACCESSIII.E STAllS MUST SLOPE I!SS lHAN
2ll: II Nf'f DIREC110N.
7 • .11..1. lRUNCAlED DOMES -. CAST-Ill-PlACE.
a. F1NAI. RETAiliNG WN..L I£JGH1S NIIJ DESIGN 111..1.
BE DElERIIIIED BY 11£ S1RUC1URAL ENGINEER.
II. .11..1. IWIPS GREAlER 1HAN I FEET NIIJ II1H A SLOPE Of 1:12, SHAU. HA~ GUARDRM.S, AS
SIIIMI ON 11£ ARQti1EC'MIAL CIIA•NGS.
10. 11£ PR<lPERTY OiliER MUST Fll OUT .. SUIIIIT AN N011CE CE INlENT NIIJ OBTAII A IWlll NUIIIER.
11. 1HE ElGSliiG FENCE IS 1HE UIIT CE GRADING.
12. ~SLOPE ON IWIPS (NON-CURB RAIIPS)
IS 1 FT 1N 11£ IIER1ICAL VS. 12 FT tl 11£
HOR1ZONTAL (1: 12, 8.33),
13. ON -ll£1ll, STeNCl. "NO DUIIP1NG, R.OWS TO OCEAN"
PlAN SPECIFIC NOlES:
0
®
®
0
®
®
(!)
®
®
@
®
@
@
9
@
@
®
@
@
@
EXISTING FENCE
BASE OF DRAINAGE SWALE (BMP)
3"0 THRU CURB CRAIN
COB8lE RIP RAP
DE1ENT10N ~(BMP)
ADA STALLS. SEE ARCHITECT\JRAl PLANS
NEW PARKING STALLS, SEE ARCHTEC1\JRAL ~
EXISTING TOP OF SLOPE
NEW 11W1H ENCLOSURE, SEE ARCHITEC'IUW. PLANS
NEW ADA CURB RAMP, 1:12 MAX SLOPE WTH
CAST ~N-PLACE TRUNCATED DOMES
CAL TRANS CASE "A" DEPRESSED CURB RAMP
NEW CONCRETE PAD FOR BIKE RACK (4' PCC14' AS)
24 FT. FIRE ACCESS ROAD
A. TURF-BI.OCK MATERIAL. IF
FEASIBLE. OlHERW1SE: 8. N:. PAVING (4'.oc/15"AB)
EXISTlNG CURB TO BE REMO\IEO
EXISTING FIRE H'I'DRANT, PER DRAWING NO. 215-7
EXISTING TRANSFORMER
EXISTING ELEClRICAl. BOX
EXISTING 0\IERHEAD UNE
ROOF DRAIN, 1YPICAL, SEE ARCH ROOF PI.AN
PROPOSED 5 FT. RETAINING WAll.
ED\! ESTIMATED CALCUlATIONS: ~ 20NINCl: M-Q INOUSTRIAI.
LAND USE DEBIGNA110N: ENERGENCV SHELlER
1 EDUI1-8F >> 14.781d1100sf•8.21 EDU
PEAK FLOW: 1 EDU • 220 golldoy
8.21 (II) 220 go~~c~oy •1,108 go11c1oy (11)2.5 • 4 518 !!!lldoy • PEA!< FLOW
GPM ESTI!!!A!ED CALCUlATIONS:
NQN.RESIOEN1'IA AVERAGE DAILY FLOW• 2,300 GP0/10,000 SF
14,781 SFI10,000SF•
1.4781 (II) 2,300 gpd (II) do)i24 ... (x) hn'80 "'". ~
TRIP GENERA110N:
CONGREGA'I£ CARE • 2.-.g .nt(bod) (II) 100-•250
OFFICE • 20NOOOSF (x) 731 • 16
TOTAL TRIP GENERATION i!!§.
FOR FURTHER !!MALE DETAILS
SEE SHEET C-3.00, 1/EGETATION
14.83'
28.00'
1
PROPOSED
BUILDING
--------=======---
\
10.00'
20.00'TOPOF
ROOF SEE
AR<HTECl\JRAL
ELEVATIONS
---..._ SI1E BENCHMAR¥
ELEV' 359.69
'NO MCNI' FINE FESCUE PER I.NClSCAPE PLANS ----------------------~S~I~TE~C~R~O~SS~~~EC~. T~I~~~~~Q0
I
" ,:;
I I
GRAPHIC SCALE
~-..r i i --i
CAUTION: IF THIS SHEET IS NOT 24"x36" IT IS A REDUCED PRINT
PROJECT DATA (C U.p 10 08):
SITE AREA:
GROSS: 3.65 AC (159,003 Sf)
NET: 1.176 AC (51,104 SF)
(LESS SLOPES)
BUILDING AREA: 14,781 SF
DORM1 5,595 SF
DORM 2 6,924 Sf
DINING/KITCHEN 2,262 SF
F.A.R.: .25 (NET)
PARKING PROVIDED: 4 STALLS
LEGEND
PROPOSED
SllRI DRA11 PFE
[g -.A (L.ANDSCAPE) -INl£T
@) SllRI DRAII IIANHOI.E
------WAlER LIIE
t><l WAlER VALVE
SDER SVSlDI
® SDERDIWI
------PR0P£RTY LIE
: BFP i
'Iii' WAlER MElER
MAJOR COIIllJUR (5' lllERVAL)
lofilR COIIllJUR (1' llmtYAL)
CLEAN OUT
--- ---RIGHT CE WAY LINE
-- --PROPOSED PHASE LINE
APPROXIMATE EARTHWORK
THE EARTH1IVORK SHOWN HERE IS AN ESITMATION, WHICH MAY NOT INO..UOE
EXACT NUMBERS FOR PAVEMENT SECTIONS, FOIJNDATION, UTIUTY AND OTHER
EARTHMOVING SPOILS, NOR DOES IT TAKE INTO ACCOUNT /W'f SHRINKAGE OR UME
TREAn!ENT. IT IS UP TO THE GENERAL CONTRACTOR TO PROJECT ACCURATE
EARTHWORK NUMBERS IN EFFORT TO ENSURE THE SITE BALANCES PROPERLY.
CUT: 1,143 CU. YDS
FILL: 1,213 CU. YDS.
TOTAL: 70 CU. YDS. IMPORT
ll1J.I]Q
S1llRII: 01TY CE CARLSBAD 780-e02-27111
SE1EII: OITY CE CARLSBAD WASIE.WAlER DI\'ISION 780-e02-2730
WAmt CARLSBAD IIHCIPAL WAlER DIS1RICT ~2722
BASIS OF BEARINGS APN
~~~~!!!!!!!
11£ BASIS Of BEARINGS IS TAKE!~ AS 11£ CEII1EIIJNE Of II'ALA CIIIVE N0R111 A.P.N.: 20!HI41-21
71114'!15" EAST, PER PARaL lUI' 15247, FUD 88-2470114, OITY CE CAIILSBAD,
SAil DIEOO COUNTY Ofi'1CIAL RECORDS.
BENCHMARK
a.!ll1011 ::r 0:S BRASS DISC II D11A1NACE BOX
~~Of CE PAIJIER WAY, 100 FT
COUGAR llR1VE.
116\Q. QlY(JKit 211:1.
SITE BENCHMARK
fllUND 2" liON PFE CENlBUIE CE II'ALA CIIIVE AT £AS1BII.Y Elll CE
QJL-DE-SAC II1H BRASS DISC ll£GIIl£
BfYA'JQt ¥iA ..
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.as 110.: soooe-ocu-QI
•
ATTACHMENT H
Concept Utility Plan
•
•
•
•
f
•
-----------
~-~-
----------I ---.I ---------~ ~~ ------__,._____ -
---------.. ! ---
----------------------· __J__ -------------------------· ------------------' --~ -~
' ...
' ' ' '
............ ...... _ , /---~ ----~~--
EDU ESTlMATED CA!.CU!.ATIONS:
CURRENTZONNG: ~ INDIJS1l<IH.
LAND USE DESIGNATION: EMERGENCY SHEL 1ER
1 EDU11800 SF » 14.781.0180Dif • 8.21 EDU
PeAK FLOW: 1 EDU • 220 gllllay
8.21 (x) 220 goLidoy • 1,806 goLidoy (x) 2.5 • 4 518 !!!1/doy • PEAK FLOIN
GPM ESTlMATED CAI.CUI.ATIONS:
NON-RESIOEN11AL AVERAGE DAILY FLOW • 2,300 GPONO.OOO SF
14,781 SF/10.000 SF •
1.4781 (lc)2,300p(l<)clo)l241n(x)hn'IIO"*'• ~
TRIP GENERATION:
CONGREGATE CARE= 2.-tnt (bod) (>c) 100-•2511 OFFICE•21111000SF(x)731 •15
TOTAL TRIPGE>ERA110N &
Gf'f'N MZ1flt
1. 1115 PUN IS alNCS"'UAL CN.Y, IT SHOUlD NOT BE USED FllR PRICING OR CCNST1IICliCIL
2. AU. .a< IS 10 COioFI.Y -1HE IEOioiiENDA110NS IE 1HE SOLS REPORT PIVARED BY WloE • loDUilll ENGINEEIWICl, DATED NJGUST 17, 2008.
:1 AU. lliiAII NElS SIIOIN 1»1 1H1S PLAN ARE 12"x12" lliiAII INLETS..
4. AU. GIWIES SHOMI Nlf. fNSHED SIWACE (Fs) UNlfSS OlHERIISE NOTED.
5. AU. IUIIIS lliiD aJRIIS • GUTTERS SHALL ClONRlRII 10 1HE Q1Y IE CN1LS11AD
STAIIIMDS.
I. AU. ACCISSil£ STAlLS IIUST SUI'E LESS ntAN 2ll II ANY 01REC110N.
7. AU. liUICATED DOllE$ Nlf. CAST-IH'W:E.
8. FIW. REI'-WAll. HEICiH1S lliiD DEliiGN 1U. BE DETERIIINED BY 1HE SlRIIC1URAL ENGINEER.
II. AU. ~ GREAlER ntAN t FEET lliiD -A SUI'E IE 1:12. SHALL HA'IE GUNIIliiAlS, AS SHOMI 1»1 11£ AIICIIlEl:lUIIA ORA-.
10. 1HE PRCPOnY IMlER IIUST F11. OUT • SUIIIT AN N011CE IE llfiDn' lliiD OBTAII A IIJil ,._,
11. 1HE EliiSmC FBICE IS 1HE IM1' IE GIIADII«l.
--PlAN SPECIFIC NQ1ES:
(j) ElCISTlNG FENCE
@ BASE OF DRAINAGE SWALE (liMP)
@ 3"11 THRU CURB DIWN
@ COBBLE RIP RAP
@ OE1EHT10N PLANTER (llMP)
@ IDA STALLS, SEE ARCI«TEC1UW. FUNS
<i) NEWPARI<ING STALLS, SEEARCH'!ECTUW. FUNS
@ ElCISTlNG TOP OF SLOf'E
@ NEW TRASH ENCI.OSURE, SEE ARCiflECnJRN.. FUNS
@ =~ :;.~"::.esSLOI'EVWIH
®=~=:-IN\/~~
@ ElCISTlNG WAlER loiETERS & IIACI<FlOW PREVENTORS,
PER DRAWING NO. 215-7
@ ="::.=~CClNlRACTORTO s
@
@
@
@
@
0
ElCISl1NG FIRE H'IDIWIT, PER llRAWING NO. 215-7
ElCISTlNG TRANSF<lRM;R & PAD
IDA RAMPIPATH. MAXSL 1:12{8.3:nl)
CI1Y STANDARD DOUBLE DE1ECTOR CHECk VALliE
AS8EI8. Y WITH P1V & FOC, SEE STD. DTL W-22
CONCRETE PAD FOR BIKE lUCK (4' PCC/4" AS)
NEW ARE SERVICE <XlNNECI10N
------
GRAPlfiC SCAlE
~ .-r i i •• i
CAUTION: IF THIS SHEET IS NOT 24"x36• IT IS A REDUCED PRINT
PRQ,£CT DATA (C U.P, 10=08);
SITE AREA:
GROSS: 3.65 AC {159,003 SF)
NET: 1.176 AC {51,104 Sf)
(LESS SLOPES)
BUILDING AREA: 14,781 SF
DORN1 5,595 SF
DORN 2 6,924 Sf
DINING/KITCHEN 2,262 SF
F.A.R.: .25 (NET)
PARKING PROVIDED: 4 STALLS
EliiS1IIG I'ROP05ED
-------~ S10RII DRAIN PFE :::.=_~_:-_ _::: __ -::--=--=-=--::.._=
jg NV. (I..ANlSCAPE) DRAIN INl£T
@ S10RII DRAIN IIANHCU
WATER UNE
~·x::; WATER VAL'IE ----SEllER S'ISlEM
® SEllER DRAIN
-----------PROPERlY UNE
~ BFP! l. _______ j IBFPI BAQ(F\.OW~
w ~ WATER METER
------IIAJOR CCN1IlUR (5' INTERVAIJ
------IIIIOR CCN1IlUR (1' IITERVAIJ
rn m -II1H CONCIIE1E PAD. SEE EI.EC1IICAL OftAWIIlS. ~~~
WllAK STANDMIIS) • • FilE tmlRNIT
~ s a£NI OUT
=v= --SIGNAGE
----PROPOSED PHASE UNE
II1JIJD.
S10RM: Q1Y IE CARl.SIIAD
SEWER:
Q1Y IE CARl.SIIAD WASIEWATER DMSION
WAlER: CNILSIIAD IIIHCIPAL WA1ER DISTRICT
BASIS OF BEARINGS
1HE BASIS CIF 11£.-GS IS TAK91 AS 1HE CEJilERUNE IE II'Al.A DII'IE NOR1H
78'14'55" EAST. P£11 PARa!. MAP 15247, fUD 11&-24'1094. Q1Y IE CNILSIIAD,
SAN DIEGO COON1Y Off1CIAL RECORDS.
BENCHMARK
ass 1oa
FlliiiD 2E BRASS DISC II DIIAIIA« BOX IUTI»>
NOR1H SllE IE PAIJIEJI WAY. 100 FT EASD.Y IE COUGNI DRI'IE.
700-102-2730
APN
A.P.N.: 2DIHI41-211
SITE BENCHMARK
El f\C6JICit; ..
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... NO.: SD8Dt-OOI:HJO
,-------------------------------
I.
ATTACHMENT I
Post Development Drainage Map
•
•
•
• r ~ i ~ l
i !!> i a
I
1:! i ~ l 0
! ! j
~
i'! < ~ < ~ ... t < !!\-Jl i E J
$ 0 • l ~
l
i ~ ~ (j
DRAINAGE AREA
\ A1
\ 12.1211 SF (0.279 Ac)
\ I \
A2
0,020 SF (0.207 Ac)
B
18,182 SF (0.3</IAc)
c
12.374 SF (0.211< Ac)
D
1,802 SF (O.tu1 kj
E
2.506 SF (O.OIJON;J
GRAPIUC SCAlE
~~ i i . I --<•-> 1 ...... -., ft.
CAUTION: IF THIS SHEET IS NOT 24"x36• IT IS A REDUCED PRINT
LEGEND:
-··-··-··-··-L =XXX' RUNOFF JRAVB. LENGTH{FT)
~----= NAMEOFDRAINAGEAREA ~ -DRAJNAGEACREAGE
FLOWLINE
~--FINISH SURFACE B.EVATION iii~::::;::::~:
TOTAL nME OF CONCENTRATION
IMPERVIOUS AREA PERVIOUS AREA %IMP. c
LANDSCAPE • 7,740 S.F.
3,232S.F. POROUS PVIIT • ?eOS.F.
(O.IJT<Ac} PAVERS • 397 S.F. 2U% 0.110
TOTAL •8,1lll7 S.F.
(0.20<Ac)
LANDSCAPE .. 6,418S.F.
2.882S.F. PAVE.;RS .. ~ 3U% 0.63 (O.OIJtJAc) TOTAL •8,138s.F.
(0.1<1 Ac)
LANDSCAPE = 3,037 S.F.
8,256 S.F. PAVERS •2.880S.F. 60.0% O.llll (0.212Ac) TOTAL •8,1108S.F.
(0.138Ac)
LANDSCAPE • 7,0t2S.F.
2.11511S.F. POROUS PVIIT• 2,<78 S.F. 23.2% 0.<8 (O.OIJtJAc) TOTAL •0,518s.F.
(0.210kj
128SF. LANDSCAPE •1,U14S.F. 41.5" 0.58 (0.011Ac} (0.02ekj
1,8WiS.F. LANDSCAPE • ecn s.F. 70.7% 0.77 (O.tullkj (0.014""1
• i
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I :=:::::::;:::::::~ J PA /Pit:.
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~------------------------------------------------------------------------------------------------------------------------------~
~~a~~ j C-10.1
•
ATTACHMENT J
Pre-Development Drainage Map
•
•
•
• DRAINAGE AREA
i .., A li ~ 63,083 SF (1.218 kj
]
! j
I
ii ~ l
! ppo
I GRAPIDC SCALE
k-•-.J .. I . I I --(•1111111'1
1 tDcla -10 ft.
s ~ ~ t .. ~
j
f • a: i
1
.ll
J u
CAUTION: IF THIS SHEET IS NOT 24"x36" IT IS A REDUCED PRINT
LEGEND:
-··-··-DRAINAGE BOUNDARY
L=XXX' RUNOFF 1RA VEL LENGTH (FTJ
NAME OF DRAINAGE AREA
DRAINAGE ACREAGE
@ ___
FLOVIILJNE
NODE NUAIBER ~-~~~ lrd ~ QVALUE(CFS)-50>R
Q VALUE (CFS) -10 >R
IMPERVIOUS AREA PERVIOUS AREA %IMP. c
EX 8I.DG. • 5,MZS.F. gT:VEABIT:fi:ift. 3i,314 S.F. 26.8" 0.<9 (O.ll03kj (0.318kj
• i • I
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PA/PV:.
--------------------------------------
•
ATTACHMENT K
Operation and Maintenance Verification Forms
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•
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
BIOFILTER
1. Transcribe the following information from your notification letter and make co"ections as necessary:
Permit No.:
BMP Location:
Responsible Party:
Phone Number:
Responsible Party Address:
Number D Check here for Address Change
0Check here for Phone Number Change
Street Name & Suffix City/Zip
2. Using the Table below, please describe the inspections and maintenance activities that have been conducted during
the last year, and date(s) maintenance was performed. Under "Results of Inspection, 11 indicate whether maintenance
was required based on each inspection, and if so, what type of maintenance. If maintenance was required, provide the
date maintenance was conducted and description of the maintenance. Refer to the back of this sheet for information
describing typical maintenance indicators and maintenance activities. If no maintenance was required based on the
inspection results, state "no maintenance required. II
Date of Date Maintenance Completed and
Inspection Results of Inspection Description of Maintenance Conducted
3. Attach copies of available supporting documents (photographs, copies of maintenance contracts, and/or
maintenance records).
4. Sign the bottom of the form and return to:
Signature of Responsible Party
County of San Diego Watershed Protection Program
Treatment Control BMP Tracking
5201 Ruffin Road, Suite P, MS 0326
San Diego, CA 92123
Print Name Date
-----------------------~------~-
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
BIOFILTER
Biofilters Include:
D Vegetated Filter Strip D Vegetated Swale D Bioretention Facility
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:
Bioretention BMPs Inspection and Maintenance Checklist
Typical Maintenance Indicators Typical Maintenance Actions
Accumulation of sediment, litter, or debris Remove and properly dispose of accumulated materials,
without damage to the vegetation.
Poor vegetation establishment 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.
Overgrown vegetation Mow or trim as appropriate, but not less than the design
height of the vegetation (typically 4-6 inches for grass).
Confirm that irrigation is adequate and not excessive and
that sprays do not directly enter overflow grates. Replace
dead plants and remove noxious and invasive vegetation.
Erosion due to concentrated irrigation flow Repair/re-seed eroded areas and adjust the irrigation
system .
Erosion due to concentrated stormwater runoff flow Repair/re-seed eroded areas and make appropriate
corrective measures such as adding erosion control
blankets, adding stone at flow entry points, or re-grading
where necessary.
Standing water (BMP not draining) Abate any potential vectors by filling holes in the ground in
and around the biofilter 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
persistent, contact the San Diego County Vector Control
Program at (858) 694-2888. Mosquito larvicides should be
applied only when absolutely necessary and then only by
a licensed individual or contractor.
Obstructed inlet or outlet structure Clear obstructions.
Damage to structural components such as weirs, Repair or replace as applicable.
inlet, or outlet structures
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
DRAINAGE INSERTS
1. Transcribe the following information from your notification letter and make corrections as necessary:
Permit No.:
BMP Location:
Responsible Partv:
Phone Number:
Responsible Party Address:
Number D Check here for Address Change
0Check here for Phone Number Change
Street Name & Suffix City/Zip
2. Using the Table below, please describe the inspections and maintenance activities that have been conducted during
the last year, and date(s) maintenance was performed. Under "Results of Inspection," indicate whether maintenance
was required based on each inspection, and if so, what type of maintenance. If maintenance was required, provide the
date maintenance was conducted and description of the maintenance. Refer to the back of this sheet for information
describing typical maintenance indicators and maintenance activities. If no maintenance was required based on the
inspection results, state "no maintenance required."
Date of Date Maintenance Completed and
Inspection Results of Inspection Description of Maintenance Conducted
3. Attach copies of available supporting documents (photographs, copies of maintenance contracts, and/or
maintenance records).
4. Sign the bottom of the form and return to:
Signature of Responsible Party
County of San Diego Watershed Protection Program
Treatment Control BMP Tracking
5201 Ruffin Road, Suite P, MS 0326
San Diego, CA 92123
Print Name Date
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
DRAINAGE INSERTS -SIDE 2
The following list of typical maintenance indicators and maintenance activities for drainage inserts is provided for your
reference.
Drainage Insert BMPs Inspection and Maintenance Checklist
Typical Maintenance Indicators Typical Maintenance Actions
Accumulation of sediment, litter, or debris Remove and properly dispose of accumulated materials.
Spent or clogged sorbent material or media pack Remove and properly dispose of sorbent material or
media pack, and replace with fresh material. These
materials/media are potentially hazardous and must be
handled by a properly trained contractor.
Damage to components of the drainage insert Repair or replace as applicable.
Maintenance of drainage inserts involves handling of potentially hazardous material (oil sorbent material), which
requires special disposal. Additionally, maintenance may involve entry into the storm drain inlet underground.
Therefore the maintenance operator must be trained in handling and disposal of hazardous waste, and must also be
certified for confined space entry if the maintenance will require entry into the storm drain inlet. Therefore it is
recommended that private BMP owners obtain a maintenance contract with a qualified contractor to provide inspection
and maintenance. There are several storm drain cleaning service providers who are able to inspect and/or maintain
drainage inserts. Contact the manufacturer of the drainage insert to find qualified service providers .
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
FILTRATION DEVICES
1. Transcribe the following information from your notification letter and make co"ections as necessary:
Permit No.:
BMP Location:
Responsible Party:
Phone Number:
Responsible Party Address:
Number
0 Check here for Address Change
0Check here for Phone Number Change
Street Name & Suffix City/Zip
2. Using the Table below, please describe the inspections and maintenance activities that have been conducted during
the last year, and date(s) maintenance was performed. Under "Results of Inspection, n indicate whether maintenance
was required based on each inspection, and if so, what type of maintenance. If maintenance was required, provide the
date maintenance was conducted and description of the maintenance. Refer to the back of this sheet for information
describing typical maintenance indicators and maintenance activities. If no maintenance was required based on the
inspection results, state "no maintenance required. n
Date of Date Maintenance Completed and
Inspection Results of Inspection Description of Maintenance Conducted
3. Attach copies of available supporting documents (photographs, copies of maintenance contracts, and/or
maintenance records).
4. Sign the bottom of the form and return to:
Signature of Responsible Party
County of San Diego Watershed Protection Program
Treatment Control BMP Tracking
5201 Ruffin Road, Suite P, MS 0326
San Diego, CA 92123
Print Name Date
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
FILTRATION -SIDE 2
The following list of typical maintenance indicators and maintenance activities for filtration BMPs is provided for your
reference.
Filtration BMPs Inspection and Maintenance Checklist
Typical Maintenance Indicators Typical Maintenance Actions
Accumulation of sediment, litter, or debris Remove and properly dispose of accumulated materials.
Accumulation of floating oil and grease Remove and properly dispose of oil and grease.
Clogged filter media Remove and properly dispose of filter media, and replace
with fresh media.
Damage to components of the filtration system Repair or replace as applicable.
Maintenance of filtration BMPs involves handling of potentially hazardous material (oil and/or oil sorbent material),
which requires special disposal. Additionally, maintenance may involve entry into the filtration BMP underground.
Therefore the maintenance operator must be trained in handling and disposal of hazardous waste, and must also be
certified for confined space entry if the maintenance will require entry into the filtration BMP. Therefore it is
recommended that private BMP owners obtain a maintenance contract with a qualified contractor to provide inspection
and maintenance. There are several storm drain cleaning service providers who are able to inspect and/or maintain
filtration BMPs. Contact the manufacturer of the filtration system to find qualified service providers .
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM 4t PLANTER BOXES
•
•
1. Transcribe the following information from your notification letter and make corrections as necessary:
Permit No.:
BMP Location:
Responsible Party:
Phone Number:
Responsible Party Address:
Number
0 Check here for Address Change
0Check here for Phone Number Change
Street Name & Suffix City/Zip
2. Using the Table below, please describe the inspections and maintenance activities that have been conducted during
the last year, and date(s) maintenance was performed. Under "Results of Inspection, II indicate whether maintenance
was required based on each inspection, and if so, what type of maintenance. If maintenance was required, provide the
date maintenance was conducted and description of the maintenance. Refer to the back of this sheet for information
describing typical maintenance indicators and maintenance activities. If no maintenance was required based on the
inspection results, state "no maintenance required. II
Date of Date Maintenance Completed and
Inspection Results of Inspection Description of Maintenance Conducted
3. Attach copies of available supporting documents (photographs, copies of maintenance contracts, and/or
maintenance records).
4. Sign the bottom of the form and retum to:
Signature of Responsible Party
County of San Diego Watershed Protection Program
Treatment Control BMP Tracking
5201 Ruffin Road, Suite P, MS 0326
San Diego, CA 92123
Print Name Date
•
•
•
PRIVATE TREATMENT CONTROL BMP
OPERATION AND MAINTENANCE VERIFICATION FORM
PLANTER BOXES
Planter boxes capture runoff from downspouts or sheet flow from plazas and paved areas. The runoffbriefly
floods the surface of the box and then percolates through an active soil layer to drain rock below. Typical
maintenance consists of the following:
Planter Box BMP Inspection and Maintenance Checklist
Typical Maintenance Indicators Typical Maintenance Actions
Accumulation of sediment, litter, or debris Check that the soil is at the appropriate depth to allow a
reservoir above the soil surface and is sufficient to
effectively filter stormwater. Remove any accumulations of
sediment, litter, and debris. Till or replace soil as
necessary. Confirm that soil is not clogging and that the
planter will drain within 3-4 hours after a storm event.
Poor vegetation establishment Determine whether the vegetation is dense and healthy.
Replace dead plants. Prune or remove any overgrown
plants or shrubs that may interfere with planter operation.
Clean up fallen leaves or debris and replenish mulch.
Remove any nuisance or invasive vegetation.
Standing water (BMP not draining) Check the underdrain piping to make sure it is intact and
unobstructed. If mosquito larvae are present and
persistent, contact the San Diego County Vector Control
Program at (858) 694-2888. Mosquito larvicides should be
applied only when absolutely necessary and then only by
a licensed individual or contractor.
Erosion due to concentrated stormwater runoff flow Examine downspouts from rooftops or sheet flow from
paving to ensure that flow to the planter is unimpeded.
Remove any debris and repair any damaged pipes. Check
splash blocks or rocks and repair, replace, or replenish as
necessary.
Damage to structural components such as the box, Observe the structure of the box and fix any holes, cracks,
inlet, or outlet structures rotting, or failure.
Obstructed inlet or outlet structure Clear obstructions. Examine the overflow pipe to make
sure that it can safely convey excess flows to a storm
drain. Repair or replace any damaged or disconnected
piping .
ATTACHMENT L
Tracking and Inventory Report Forms
•
•
•
•
COUNTY OF SAN DIEGO
DEPARTMENT OF PUBLIC WORKS
POST -CONSTRUCTION TRACKING AND
INVENTORY REPORT
General Project Information
Permit Number __________ SWMP Category (Major/Minor) ____ _
Location/Address ______________________________________________ __
Engineer of Work: ___________________ State Registration Number: -------
Company Name: ________________________________ ___
Address: _________________________________ ___
Email Address: -------------------------------------PhoneNumber: __________________________________ __
Priority Development Project-Step 1: --------------
Percent Impervious Before Construction: % ________________ __
Percent Impervious After Construction: % _____________________ _
Project Disturbed Area: _____ Acres
Hydromodification Management-Step 3:
YesO or No 0
Primary or Secondary Pollutants of Concerns -.Step 4 (check all that apply) 0 Sediment -0 Trash and Debris 0 Nutrients 0 Oxygen Demanding Substances D Organic Compounds 0 Oil and Grease
D Bacteria and Viruses 0 Pesticides
Project Specific Site Design, LID and Source Control BMrs
All selected Site Layout Strategies, LID, and Source Control BMPs must be shown on the Plan.
Site Layout Strategies-Step 5 (check all that apply) 0 Limitation of Development Envelope 0 Preservation of Natural Drainages 0 Minimization of imperviousness 0 Using drainage as a design element 0 Setbacks from creeks, wetlands, and riparian habitats
Disperse Runoff from Impervious Surfaces to Pervious-Step 5 (check all that apply)
0 Street and Road Design D Parking Lot Design 0 Driveway, Sidewalk, Bikepath Design D Building Design
D Landscape Design D Direct Runoff to Treatment BMP(s)
•
of San Diego
pepartment of Public Works
Engineer's SWMP Final Report
Page 2 of2
Source BMPs-Step 6 (check all that apply) 0 Stormdrain Signage and Stenciling D Trash Storage Areas 0 Private Road Drainage System
0 DockAreas
0 Vehicle Wash Areas
0 Equipment Wash Areas
0 Fueling Areas
0 Outdoor Storage Areas
0 Efficient Landscape Irrigation Design
0 Residential Driveways & Guest Parking
0 Maintenance Bays
0 Outdoor Processing Areas
D Parking Areas
Post-construction Treatment Control BMP Information
Responsible Party for Maintenance-Step 8:
Name ____________________________________ PhoneNumberl__) __________ __
Street Number _____ Street Name--------------------
City State --------------------'Zip _______ _
Email Address: --------~~~---------------------------
Project Maintenance Category (1, 2, 3 ot4): _,c
·.;.~~~~iJ~;~s,-
.--. -;~--P . S .fi T c lBMP ro1ect ipect tc reatment ontro s :.'i::+>~r;:.: . ._
BMP BMPType BMP Pollutmt .\':P''· ·~mat Final Construction
Identifier* of ConceriK~i~;, ~:~~nstn:d?litt Date Inspector Name
Efficiency \i~ ..
(to be completed by (to be completed by County
(H,M,L)-. ~t~County inspector) inspector)
Table 11
~ :1 •
*For location of BMP's, see approved Record Plan dated-----------' plan sheet __ .
•
• [
/
•
•
Jounty of San Diego
·Department of Public Works
Engineer's SWMP Final Report
Page 2 of2
Record Plan Certification
I certify that the above items for this project are in substantial conformance with the approved
plans. Yes 0 or No 0
Please sign your name and seal. [SEAL]
Print Name:----------------
Sign Name:----------------
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GENERAL NOTES:
1. THIS PLAN IS CONCEPTUAL ONLY, IT SHOULD NOT
BE USED FOR PRICING OR CONSTRUCTION.
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2. ALL WORK IS TO COMPLY WITH THE
RECO~MENDA1lONS OF THE SOILS REPORT PREPARED
BY VINJE & MIDDLETON ENGINEERING, DATED AUGUST
17, 2009.
3. ALL DRAIN INLETS SHOWN ON THIS PLAN ARE
12"x12" DRAIN INLETS, EXCEPT I~ THE DRIVEWAY,
SEE UTILITY PLAN, C-2.00 FOR TYPE.
4. ALL GRADES SHOWN ARE FINISHED SURFACE (FS)
UNLESS OTHERWISE NOTED.
5. ALL CURBS AND CURBS & GUTTERS SHALL
CONFORM TO THE CITY OF CARLSBAD STANDARDS.
6. ALL ACCESSIBLE STALLS MUST SLOPE LESS THAN
2% IN ANY DIRECTION.
7. ALL TRUNCATED DOMES ARE CAST -IN-PLACE.
8. FINAL RETAINING WALL HEIGHTS AND DESIGN WILL
BE DETERMINED BY THE STRUC1lURAL ENGINEER.
9. ALL RAMPS GREATER THAN 6 FEET AND WITH A
SLOPE OF 1:12, SHALL HAVE GUARDRAILS, AS
SHOWN ON THE ARCHITECTURAL DRAWINGS.
10. THE PROPERTY OWNER MUST FILL OUT & SUBMIT
AN NOTICE OF INTENT AND OBTAIN A WDID NUMBER.
11. THE EXISTING FENCE IS THE LIMIT OF GRADING.
12. MAXIMUM SLOPE ON RAMPS (NON-CURB RAMPS)
IS 1 FT IN THE VERTICAL VS. 12 FT IN THE
HORIZONTAL (1: 12, 8.33%).
13. ON DRAIN INLETS, STENCIL "NO DUMPING, FLOWS
TO OCEAN'
PLAN SPECIFIC NOTES:
EXISTING FENCE
BASE OF DRAINAGE SWALE (BMP)
3"0 THRU CURB DRAIN
COBBLE RIP RAP
DETENTION PLANTER (BMP)
ADA STALLS, SEE ARCHITECTURAL PLANS
NEW PARKING STALLS, SEE ARCHITECTURAL PLANS
EXISTING TOP OF SLOPE
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NEW TRASH ENCLOSURE, SEE ARCHITECTURAL PLANS....___
NEW ADA CURB RAMP, 1:12 MAX SLOPE WITH
@
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CAST-IN-PLACE TRUNCATED DOMES
CAL TRANS CASE "A" DEPRESSED CURB RAMP
NEW CONCRETE PAD FOR BIKE RACK (4" PCC/4" AB)
24 FT. FIRE ACCESS ROAD
A. TURF-BLOCK MATERIAL, IF
FEASIBLE, OTHERWISE:
B. AC PAVING (4"AC/15"AB)
EXISTING CURB TO BE REMOVED
EXISTING FIRE HYDRANT, PER DRAWING NO. 215·7
EXISTING TRANSFORMER
EXISTING ELECTRICAL BOX
@ EXISTING OVERHEAD LINE
@ ROOF DRAIN, TYPICAL, SEE ARCH ROOF PLAN
@ PROPOSED 5 FT. RETAINING WALL
EDU ESTIMATED CALCULATIONS:
CURRENT ZONING: M-Q INDUSTRIAL
LAND USE DESIGNATION: EMERGENCY SHELTER
1 EDU/1800 SF » 14,7B1sf/1BOOsf= 8.21 EDU
PEAK FLOW: 1 EDU = 220 gaVday
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8.21 (x) 220 gal/day= 1,806 gal/day (x) 2.5 = 4,516 gal/day= PEAK FLOW
GPM ESTIMATED CALCULA liONS:
NON-RESIDENTIAL AVERAGE DAILY FLOW= 2,300 GPD/10,000 SF
14,781 SF/10,000 SF=
1.4781 (x) 2,300 gpd (x) day/24 hrs (x) hr/60 min= 2.36 gal/min.
TRIP GENERATION:
CONGREGATE CARE= 2.5/dwelling unit (bed) (x) 100 beds= 250
OFFICE= 20/1000SF (x) 731 = 15
TOTAL TRIP GENERATION = 265
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26.00'
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PROPOSED
BUILDING
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20. 00' TOP OF
ROOF SEE
ARCHITECTURAL
ELEVATIONS
5'± -+--1----------15.76'± ------1-----1
FOR FURTHER SWALE DETAILS
SEE SHEET C-3.00, VEGETATION
"NO MOW" FINE FESCUE PER LANDSCAPE PLANS
SITE CROSS SECTION @ ~-------....::....:....:........::___:...__::__c:___~~-A SCALE: N. T. S.
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GRAPHIC. SCALE
( IN FEET )
1 inch = 20 ft.
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CAUTION: IF THIS SHEET IS NOT 24"x36" IT IS A REDUCED PRINT
PROJECT DATA ( C.U.P. 1 0-08):
SITE AREA:
GROSS: 3.65 AC (159,003 SF)
NET: 1.176 AC (51,104 SF)
(LESS SLOPES)
BUILDING AREA:
DORM 1
DORM 2
DINING/KITCHEN
F.A.R.:
PARKING PROVIDED:
EXISTING
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APPROXIMATE EARTHWORK
14,781 SF
5,595 SF
6,924 SF
2,262 SF
. 25 (NET)
4 STALLS
LEGEND
PROPOSED
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STORM DRAIN PIPE
AREA (LANDSCAPE) DRAIN INLET
STORM DRAIN MANHOLE
WATER LINE
WATER VALVE
SEWER SYSTEM
SEWER DRAIN
PROPERTY LINE
BACK FLOW PREVENTER
WATER METER
MAJOR CONTOUR (5' INTERVAL)
MINOR CONTOUR (1' INTERVAL)
TRANSFORMER WITH CONCRETE
PAD, SEE ELECTRICAL DRAWINGS.
(PROVIDE PROTECTION BOLLARDS
PER LOCAL UTILITY OR PUBLIC
WORK STANDARDS)
FIRE HYDRANT
CLEAN OUT
SIGNAGE
RIGHT OF WAY LINE
PROPOSED PHASE LINE
THE EARTHWORK SHOWN HERE IS AN ESITMATION, WHICH MAY NOT INCLUDE
EXACT NUMBERS FOR PAVEMENT SECTIONS, FOUNDATION, UTILITY AND OTHER
EARTHMOVING SPOILS, NOR DOES IT TAKE INTO ACCOUNT ANY SHRINKAGE OR LIME
TREATMENT. IT IS UP TO THE GENERAL CONTRACTOR TO PROJECT ACCURATE
EARTHWORK NUMBERS IN EFFORT TO ENSURE THE SITE BAU.NCES PROPERLY.
CUT: 1,143 CU. YDS
FILL: 1,213 CU. YDS.
TOTAL: 70 CU. YDS. IMPORT
UTILITIES
STORM:
CITY OF CARLSBAD 760-602-2799
SEWER:
CITY OF CARLSBAD WASTEWATER DIVISION 760-602-2730
WATER:
CARLSBAD MUNICIPAL WATER DISTRICT 760-438-2722
BASIS OF BEARINGS APN
THE BASIS OF BEARINGS IS TAKEN AS THE
CENTERLINE OF IMPALA DRIVE NORTH A.P.N.: 209-041-28
7814'55" EAST, PER PARCEL MAP 15247,
FILED 88-247094, CITY OF CARLSBAD,
SAN DIEGO COUNTY OFFICIAL RECORDS.
BENCHMARK
CLSB 108
FOUND 2.5" BRASS DISC IN DRAINAGE BOX
INLET ON
NORTH SIDE OF PALMER WAY, 100 FT
EASTERLY OF
COUGAR DRIVE.
NAVD 88 ELEVATION: 248.59
SITE BENCHMARK
FOUND 2" IRON PIPE CENTERLINE OF
IMPALA DRIVE AT EASTERLY END OF
CUL-DE-SAC WITH 3RASS DISC ILLEGIBLE
ELEVATION: 359.69'
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