HomeMy WebLinkAboutCT 03-02; Carlsbad Ranch PA 5; Storm Water Management Plan; 2012-01-05CT 03-02
CARLSBAD RANCH, PLANNING AREA N0.5
MARBRISA - PHASE II
WDID# 9 37C362798
STORM WATER MANAGEMENT PLAN
(SWMP #11-15)
ADDENDUM TO PREVIOUS SWMP
DATED November 14, 2003
PREPARED FOR
GRAND PACIFIC CARLSBAD, L.P.
5900 PASTEUR COURT, SUITE 200
CARLSBAD, CA 92008
(760) 431-8500
Prepare(d by:
ROBERT D. DENTINO
£XC£l
LAND PLANNING* ENeiNEERING* eiS*SIIRVEYING
440 State Place
Escon(di(do, CA 92029
Ph:760-745-8118
Fax: 745-8118-1890
Preparation Date:
] 0-3-2011
Revision 1: 12-2-2011
Revision 2: 01-5-2012
RECORD COPY
/iiitiiil l5(^t8
CARLSBAD RANCH PA 5 - MARBRISA PHASE II
SWMP-JANUARY2012
TABLE OF CONTENT
I. Project Description
1.1 Project Existing and Vicinity Mop
1.2 Project Stormwater Quality Determination
1.3 Proposed Land use and anticipated activities ttiat would affect Stormwater
1.4 Nearby water bodies, existing storm drain systems
II. Applicable Stormwater Standards
2.1 Completed Storm Water Standard Questionnaires (SWSQ)
2.2 HMP Applicability Determination using expanded narrative from SUSMP
& HMP Lawful Prior Compliance
III. Identify Pollutant of concern
3.1 Identify Watershed and Hydrologic Unit Contribution Basin and Receiving waters
3.2 Identify pollutants associated witli type of Land use
3.3 Beneficial uses of receiving water
3.4 Summary of primary pollutants of concern
IV. Source Control Measures
4.1 Description of site activities and potential sources of pollutants
4.2 Complete table shiowing sources, permanent source control, and operational
source control
V. Low Impact Development (LID) design strategies
5.1 Description of site activities and potential sources of pollutants
5.2 Approach to Integrated LID
5.3 Integrated LID Design
VI. Operation and Maintenance
6,1 Ownershiip and Responsibility
Attachments
A, Construction Ttireat Assessment workshieet E-33 and Stormwater Standards Questionnaire
(SWSQ) Form E-34
B, Post-construction BMP Exhilblt
C, DMN TCBMP sizing Exhibit
D, BMP product information and Educational Material
E, Soil Percolation Test Result by MTGL
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY 2012
I. Project Description
1.1 Project Description and Vicinity Map
The proposed development is located at the west of Grand Pacific Drive, 600 feet from Cannon
Road and Grand Pacific Drive intersection. It is approximately 12,8 acres as a part of 56,4 acres
Carlsbad Ranch, Planning Area 5 project. County of Son Dlego, California,
At this Phase II, the existing condition is a graded pod (graded from Phase i), The storm water atthe
existing condition Is collected into a depression area acting as a detention pond with 36" stand pipe
and 24" storm drain outlet to a bio-retention area at the downstream before draining to a 42" public
storm drain on the south.
The proposed development will contain a combination of parking lots/areas, swimming pools,
landscaping and dwelling or building areas as well as the proposed private street that will provide
access throughout the entire site. Infrastructures will include new storm drain as well as water and
sewer main extensions and new dry utilities runs/extensions to service the lots.
VICINITY MAP
CITY OF OCEANSIDE
HIGHWAYL..,^
CITY OF VISTA
NOT TO SCALE
SITE CITY OF
SAN MARCOS
PACIFIC \
OCEAN
CITY OF ENCINITAS
Fig, 1, Vicinity Map
CARLSBAD RANCH PA 5 - MARBRISA PHASE ||
SWMP-JANUARY201 2
1,2 Project Stormwater Quality Determination
Total Project Site Area 12,8 (Acres)
Estimated annount of disturbed acreage;
WDID number from the SWRCB: 9 37C362798
12,8 (Acres)
Amount of impen/ious surface on your project before and after construction.
A. Total size of project site: 12.8 (Acres)
B, Totai impervious area (including roof tops) before construction _0,10_
C. Total impervious area (including roof tops) after construction _
Calculate percent impervious before construction: B/A = _0.80
Calculate percent impervious after construction: C/A =
(Acres)
7,5_ (Acres)
lo
57 %
1.3 Proposed Land use and anticipated activities that would affect Stormwater
Proposed Land use is Multi-apartment building (time shore) and recreation facility. Anticipated
pollutants that may be generated from this type of land use activity are as follows:
Trosft ond 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 crate a
high biochemical oxygen demand in 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 hazaidous
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 ox^en
demand of a substance can iead to depletion of dissolved oxygen in a water body and possibly the
development of septic conditions.
Oil and Grease - Oii 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 ttiese
pollutants to the water bodies are very possible due to the wide use 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,
Pattiogens - Pathogens (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 organic wastes causes increased growth of undesirable organisms in the
water.
Pesficides - Pesticides (including herbicides] are chemical compound commonly used to control
nuisance growth or prevalence of organisms. Excessive or improper application of a pesticide may
result in runoff containing toxic levels of its active ingredient.
Nutrients - Nutrients are in organic 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 or
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,
3
CARLSBAD RANCH PA 5 - MARBRISA PHASE i|
SWMP-JANUARY 201 2
referred to as Cultural Eutrophication, may lead to excessive decoy 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.
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 ore also row material components in non-metal products sucti 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, Environmentai concerns, regarding the potential for release of metals to
the environment, have already ied to restricted metal usage in certain applications.
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 rotes, smoother bottom dweiiing organisms,
and suppress aquatic vegetation growth.
The first flush of storm water will be treated by TCBMP medio filter or sand filter and the 100
year-storm event will be over flowing to the catch basins/ grated inlets. Some temporary
ponding areas may occur on some spots of the parking space during big storm event to
detain some of the storm water and to mimic the existtng condition, Ali run-offs will be
directed to sand filter areas before they are released to the public storm drain.
1.4 Nearby waterbodies and Impaired waterbodies
Tills major part of the project is located in the Carlsbad Hydrologic Unit (904,00), Encinas Hydrologic
Watershed (904,40). Receiving water downstream is Canyon De Las Encinas and eventually to
Pacific Ocean, The Carlsbad Hydrologic Unit is approximately 210 square miles in area extending
from the headwate,rs above Lake Wohlford in the east to Pacific Ocean in the west and from Vista
and Oceanside In the north to Solano Beach, Escondido, and the community of Rancho Santa Fe
to the south.
The impaired waterbodies is NOT listed in 303(d) 2007 list.
The proposed project is designed so that it will not significantly alter the drainage pattern on the site.
The surface water runoff discharge will not divert from existing conditions. This project will not present
any potential threat to erosion or water quality deterioration.
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY 201 2
II. Applicable Stormwater Standards
2.1. Stormwater Standard Questionnaires (SWSQ)
To address post-development pollutants that may be generated from development projects and
meet the City of Carlsbad requirements a Stormwater Standard Questioners Is completed. Please
refer to Attachment A for this completed form.
2.2. Hydromodification Lawful Prior Compliance
Phiase II - The Water Quality or Stormwater Management and Maintenance for this portion of the site
was covered in the original entitled CEQA Master SWMP document for the entire Carisbad Roncti,
Planning Area No, 5 Site, The referenced CEQA Master SWMP document was dated from July 2004,
Consequently, the water quality measures that were outlined in the overall CEQA Master SWMP were
constructed under the Phase I portion of the site (Per DWG,NO, 428-9A doted 9-27-2005, and
outiined In the SWMP for Phase I, doted May 2005), A number of these measures foil within the
footprint of the proposed Phase II portion of the site and were designed to treat this area. These
include: Perimeter Bio-swales, ultimate downstream storm drain outfall pipes as well as off-site
detention ponds constructed per adjacent projects. Mass grading for the Phase II area was also
performed per permitted plans (DWG, No. 428-9A)
These were oil completed in compliance with the original Master CEQA SWMP for the site.
This SWMP for Phase II is on addendum to that previously referenced master plan in order to comply
with the newly adopted LID requirements.
CARLSBAD RANCH PA 5 - MARBRISA PHASE i|
SWMP-JANUARY2012
Identify Pollutant of Concern
identify Watershed and Hydrologic Unit Contribution Basin And Receiving Waters
G San Juan 901 • Santo Margarita 902 • Son Luis Rey 903 V Carlsbad 904
• San Dieguito 905 • Penasquitos 906 • San Dlego 907 • Sweetwater 909
C otay 910 • Tijuana 911 • Whitewater 719 • Clark 720
• West Salton 721 • Anza Borrego 722 • Imperial 723
Receiving water downstream
Number Nome
904.40 Encinas
http://www.waterboards.ca.gov/sandiego/waterjssues/prograins/basin_plan/index.shtm]
SURFACE WATERS
Surface Waters
(rivers, creeks, stream, etc.)
Hydrologic Unit
Basin Number
Impairment(s) listed
[303(d) listed waters or
waters with established
TMDLs ]
Distance to Project
Canyon de Las Encinas 904.40 Not listed 0.75 miles
3.2 Identify Pollutants associated with type of Land use
As discuss on section 1,2 regarding proposed land use and anticipated activities that would affect
Stormwater, Table 1 below shows what ore the Developments that are most likely generated types of
pollutants.
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY 201 2
Table 2, Anticipated and Potential Pollutants Generated by Land Use
Prioiitv'
Proiect
Cjiregoiies
Genecat Pollutain Categories
Prioiitv'
Proiect
Cjiregoiies SedimeiiE
Heavy
Mesals
Organic
Comi»imds
Tiaslt &
Debns
OKygen
DemaiiKliiHg
Substances
OiI&
Grease
Bacteria &
\'ini3es Pestsddei
D€t,icl'.ed
E.«udet:o.il X X X X X X X
.An;.ch«d
E.es:d6iital
D«-eiopjaeat
X X P{1) Pf2) P X
Commercisi
De-v-etepiEeiit
-one -jcie
P(I) Pfl) X P(2) X P(5) X Pfj)
X X X X X X
.•\vitomoti':ie
Rfpiii Shops X X(4;i{5) X X
E.f;i.iiii?.ats X X X X pfii
H^sid*
:>5,000 ft2
X X X X X
Psxkiog LOIS :p(i) pfi) X X P{1) X Pfl)
Gssoliiie
Ont'eti
X X X X X
Streets,
X P(l) X X P(5) X X p(i)
X = aj:uctp.\reci
P = potsj-tia]
1; .\ pstsjjiijl poil-aaat if bjidKapissf exists oa-5i!s.
,;2i .-i poteatirlpoltatast if dne pfcpctiiickufes m>;«s7eied ^.Tiki::^ jxess.
,'3; .\ p^tejitifJ poliutiBt if taid ass JEVQI.'.'K food or iuto.ii 'oi-Ji:-ts ptodvssi.
• 5' IiKlmrxEjr scwsisii.
Source: SUSMP County of Son Diego - January 2011
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY2012
Anticipated Potential Pollutants
Using Table 1 above, the onttclpated pollutants of this project ore the following:
• Sediments • Trash 8c Debris
• Nutrients • Oxygen Demanding Substances
• Heavy metal Oil & grease
• Organic Compounds • Pesticides
• Bacteria & viruses
3.3 Beneficial uses of receiving water
The beneficial uses for the hydrologic unit ore included in Table 2 and 3, These tables were
e)(tracted from the Water Quality Control Plan for the San Diego Basin. The following ore the meaning
and descriptions of the acronyms used:
MUN - Municipal and Domestic Supply: includes uses of water for community, military, or individuai water
supply systems including, but not limited to, drinking water supply,
AGR - Agricultural Supply: Includes uses of water for farming, horticulture, or ranching including, but not
limited to, irrigation, stock watering, or support of vegetation for range of grazing,
IND - Industriai Services Supply: Includes uses of water for industrial activities that do not depend primarily
on water quality including, but not limited to, mining, cooling water supply, hydraulic conveyance, gravel
washing, fire protection, or oii well re-pressurization.
RECl - Contact Recreation: Includes uses of water for recreational activities involving body contact witti
water, where ingestion of water is reasonably possible. These uses inciude, but ore not limited to
swimming, wading, water-skiing, skin and SCUBA diving, surfing, white water activities, fishing, or use of
natural hot springs,
REC2 - Non-Contact Recreation: includes the uses of water for recreational activities involving proximity to
water, but not normally involving body contact with water, where ingestion of water is reasonably possible.
These uses include, but not limited to picnicking, sunbathing, hiking, camping, boating, tide pool and
marine life study, hunting, sightseeing, or aesthetic enjoyment in conjunction with the above activities,
WARM - Warm Freshwater Habitat: Includes uses of water that support worm water ecosystems including,
but not limited to, preservation or enhancement of aquqtic habitats, vegetation, fish or wildlife, including
invertebrates,
WILD - Wildlife Habitat: Includes uses of water that support terrestrial ecosystems including, but not limited
to, preservation and enhancement of terrestrial habitats, vegetation, wildlife, (e,g,, mammals, birds,
reptiles, amphibians, invertebrates), wildlife water and food sources,
INLAND SURFACE WATERS
Under the Clean Water Act the state is required to specify appropriate water uses to be
achieved and protected, The beneficial use designation of surface waters of the state must
take into consideration the use and value of water for public water supplies, protection and
propagation of fish, shellfish and wildlife, recreation In and on the water, agricultural.
Industrial and other purposes including navigation.
Inland Surtace waters have the following beneficial uses as shown on Table 2
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY2012
Carlsbad Hydrologic Unit (904,00), Canyon De Las Encinas (904,40)
TABLE 3. Beneficial Uses for Inland Surface Waters
Hydrologic
Unit M I R R W W A
Number U N E E A I G
N D C C R L R
1 2 M D
904.4 * - 0 X X X -
GROUND WATER
Under the Clean Water Act the state is required to specify appropriate water uses to be
achieved and protected. Ground waters in the San Diego Region con have as many as six
designated beneficial uses including: (1) municipal and domestic; (2) agricultural; (3) Industrial
service supply; (4) industrial process supply; (5) ground water recharge; and (6) freshwater
replenishment. None of these beneficial uses will be impaired or diminished due to the
construction and operation of this project.
Cadsbad Hydrologic Unit (904,00), Agua Hedionda Creek (904,31)
TABLE 4. Beneficial Uses for Ground Water
Hydrologic
Unit M A I
Number U G N
NRD
904.40 xxx
* Excepted from Municipal
0 Potential Beneficial Use
X Existing Beneficial Use
- Not Applicable
3.4 Summary of primary pollutants of concern
This major port of the project is located in the Carlsbad Hydrologic Unit (904,00), Encinas Hydrologic
watershed (904,40), Receiving water downstream is Canyon De Los Encinas Creek (904,40) and
eventually to Pacific Ocean,
The impaired water-bodies Is NOT listed In 303(d) 2007 lists.
Therefore, the primary pollutants of concern for the project ore unknown. The secondary pollutants
ore sediments. Nutrients, Oxygen Demanding substances, heavy metal, trash, debris, oil and grease
and pesticides.
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
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IV. Source Control Measures
4.1 Description of site activities and potential sources of pollutants
Source control BMPs ore structured around the concept of "activities" as experience has shown ttiot
with few exceptions one or more of these activities will satisfactorily describe ali commercial
facilities.
Storm Drain Signage
Storm drain Inlets and access points to natural drainage courses will be marked to discourage
illegal dumping, with markings indicating the receiving water by name. Specifically:
1, All storm drain inlets and catch basins within the project area will have a tile or signage
placed with prohibited language (such as: "NO DUMPING - DRAINS TO PACIFIC OCEAN
SHORELINE")
2, Signs and prohibited language and /or graphical icons, which prohibit Illegal dumping,
must be posted at public access points along channels and creeks within the project
area,
3, Legibility of tiles and signs must be maintained and ttles must be placed flush with the top
of concrete to reduce tripping by pedestrians.
Thrash and debris from general site hotel/villa use and other sources will be prevented.
Prevention is chiefly form the fact that guests or concerned individuals when property informed of
the consequences of irresponsible disposal of thrash and debris will eventually affect our water
bodies. Providing seminars as a form of educating oil concerned will provide an extra plus to this
BMP,
Street Sweeping
Street sweeping scheduled at appropriate intervals (we recommend a minimum of bi-weekly
intervai [this is based on economy and approximate accumulation of dirt and sediments),
however it is per the discretion of manoaement to schedule this activitv for the wellness and
ambiance of the hotel/villa) con reduce pollutants that hove built up over time and become
deposited from vehicles, plants and other vegetations along sidewalks and islands. It is
recommended that this BMP be implemented expeditiously or upon completion of paving
construction of all internal driveways and parkina lots.
The following will be minimized:
1, Thrash and debris from general site hotel/villa use, and from drivers & pedestrians
2, Sediments and soils contaminated with oils and similar products associated with
automobiles.
Landscaping
Landscaping of the slopes and other parts of the site will be incorporated into the plans, To
expeditiously achieve plant establishment to reduce erosion, landscaping will consist of both
native and non-native plants. The irtigation system will be closely monitored to reduce over
irrigation and thus protect the manufactured slopes from being destabilized due to over
watering and over saturation of the soil.
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CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
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Maintenance of vegetated or landscaped areas (street sidewalks, street landscaped Islands or
slopes) and other planted areas should be the responsibiiity of the owner or corporation handling
the property, This owner will develop a schedule and funding scheme when the project is turned
over by the contractor/developer to them.
TABLE 5. Permanent and Operational source control measures
Permanent Source control BMPs Operational source controi BMPs Potential source of runoff
pollutants
1, On-site storm drain inlets Mark inlets with the words "NO
DUMPING!"
Maintain periodically repaint
or replace iniet markings
Include the following in lease
agreements: "Tenant shall
not allow anyone to
discharge anything to storm
drains".
2, Refuse areas Roofs/ awnings sfiall be
provided
Trash storage pad is paved
Trash container is walled
Signs wiil be posted on or
near dumpsters with the
words "Do not dump
hazardous materials here"
Dumpsters wiil be handled by
hired waste management
company
Maintain and clean
periodically
Prohibit/prevent dumping of
liquid or hazardous wastes.
3, Plazas, Pork, street and parking
lot
Sign with the words "NO
LIHERING",
"TRASH BINS" signs nearby
trash bins.
Covered Trash bins with
plastic bag inside located
strategically.
Street Sweeping,
Maintain periodically repaint
or replace sign markings
every 6 months.
Street sweeping frequency bi-
weekly or no less than that of
City of Carlsbad,
Washwater containing any
cleaning ogent/degreoser
shall be collected and
discharge to the sanitary
sewer and not discharged to
a stormdrain.
4, Pools, Spas, ponds, decorative
ountoins, and other water
features.
The pools will be plumbed to
the sanitary sewer and will be
made according to local
requirements.
Control olgae with chlorine or
sodium bromide
Do not dischorge pool water
to a street or storm drain
Call local wastewater
treatment plant for further
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP - JANUARY201 2
guidance on fiow rote
restrictions.
• Refer to SC-72 "Fountain and
Pool Maintenance", CASQA
Handbook
5, Landscape/ Outdoor Pesticide
use
^ Design landscaping to
minimize irrigation and runoff,
to surface promote infiltration
" Where landscape areas are
used to retain or detain
Stormwater, a native
Californian saturated soii
tolerant vegetation type is
used.
• Maintain landscaping using
minimum or no pesticides,
• Refer to SC-41 "Building and
Grounds Maintenance",
CASQA Handbook,
12
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
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1^. Low Impact Development (LID) Design Strategies
5.1. Description of site activities and potential sources of pollutants
b minimize Stormwater-reioted impacts, the following design principles ore applied to the layout of
lie site:
• Detain and retain runoff throughout the site
This project Implements Blo-retentlon Swale with underdrain pipes connected to an existing
riser, Blo-retentlon swale can convey high flows while percolating and treating lower flows, At
the Sales Building two bio-retention facilities ore used to treat the storm water coming from
the roof and one location of blo-retentlon swole at the driveway entrance.
An LiD facility must be selected to treat the project pollutants of concern identified in Table 1
"Project Pollutants of Concern", A treatment control facility with high or medium pollutant removal
efficiency for the project's most significant pollutant of concern shall be selected,
TABLE 6, Group of Pollutants and relative effectiveness of treotment facilities
Pollntants of
Concem
Bioretention
Facilities
(LID)
Settling
Basins
(Dr\-
Ponds)
Wet Ponds
and
Constnicted
Wetlands
Infiltration
Facilities
or
Practices
(LID)
Media
Filters
Higher-
rate
biofilters*
Higher-
rate
media
fdters*
Trash
Racks &
Hydro
-dynamic
Devices
Vegetated
Swales
Coarse
Sediment
and Trash
High High High High High High High High High
Pollutants
that tend to
associate
rith fine
particles
during
treatment
High High High High High Mectiiiiii Medium Low Medituii
Pollutants
ihat tend to
he dissolv-ed
following
treatment
Medium Loxv Medium High Low Low Low Low Low
Source: County of San Diego SUSMP - January 2011
5.2. Approach to Integrated LID
Optimize the site layout
This project is designed to have buildings and circulation to minimize the amount of roofs and
paving.
Use of Pervious Surfaces and drain impervious area to Engineered Bio-retention
Turf associated with landscape Is widely used where possible in this project. There is a wide and
rather flat Bio-swale adjacent to the toe ot slope; this area is used as a storm water retaining facility,
allows it drain slowly and also is used to convey big flows coming from the site. This area has 12"
underdrain pipe with 12" stand pipes with atrium grate every 50 feet and have top of grates higher
than the bio-swale finish grade. This under drain pipe and the stand pipes will reduce the water level
on the bio-swale faster during the large storm event.
13
CARLSBAD RANCH PA 5 - MARBRISA PHASE II
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Dalncge IVIanagement Areas (DMAs)
Tte entire project area is divided Into individual Drainage Management Areas (DMAs), This
delineation was done by following grade breaks and roof ridge lines. In general, there ore 3 outfalls
Inthe post-development; Tnbutan/ area basin 1 represents the flow that drains to the OUTFALL 1
(south), Tnbutory area basin 2 drains to OUTFALL 2 (southeast), and Basin 3 drains to OUTFALL 3 (east).
These three tributon/ areas ore divided Into sub-areas based on the proposed surface shape and
the existing topography. Those outfalls ultimately will confluence at downstream in on existing 5x4
storm drain clean out,
Integrated Management Practice (IMP)
All run-offs from Impervious surface will be treated to on Integrated Management Practice (IMP), In
ths project we chose Bio-retention as the storm water treatment facility.
ODTFALL1 drains onto Integrated Management Practice number I and is labeled as IMP I, Outfell 2
drains onto IMP 11, The Sales Building DMAs ore divided by 3 such as: the Soles Building roof is treated
bvIMP III and IV, the soles building drive entrance is treated by IMP V. These DMAs eventually drain
into OUTFALL 3 at existing 3X3 grated Inlet box,
Baed on the peak flow-rotes that drain into the IMPs, IMP i and II handle a vety big 100 year storrfi
return period, therefore 12" perforated under drain pipe with 12" riser at ever/ 50 feet is provided to
drain the runoff as mentioned above. Earthen channel is mode to ensure the large amount of storm
run-off will not spreading beyond the designated swole area or property line. Emergency spillway is
provided at downstream to handle the storm incase the existing 48" riser foil.
The peak-flow rotes at IMP III, IV, and V are considered small since its generated from area relative
smaller than IMP I and II, therefore 4" perforated under drain pipe with 6" cleanout pipe are
adequate to avoid the water level in the bio-retention overflowing the top of the pond,
5.3. Integrated LID Design
There ore three outfalls for this project Labeled as OUTFALL 1, 2 and 3. OUTFALL 1 has bio-retention
swale to treat approximately 330,000 square feet of area and labeled the bio-retention as IMP I,
OUTFALL 2 also has bio-retention swole to treat approximately 190,700 sqff, site area and labeled
the bio-retention as IMP II,
OUFFALL 3 treated the storm water Into 3 Individual bio-retention facilities called as IMP III, IMP IV and
IMP V. The design documentation for delineation of the pervious area and impervious area Is
provided in attachment C,
this project be utilizing the unified LID design procedure as described in chapter 4 of the
Local SUSMP? (If yes, please document in Atfactiment D foiiowing ttie steps in Ctiapter 4 of
ttie County SUSMP]
(Teg) No
If the project is not utilizing the unified LID design procedure, please describe how the
alternative treatment facilities wiil comply with applicable LID criteria, storm water treatment
criteria, and hydromodification management criteria,
14
CARLSBAD RANCH PA 5 - MARBRISA PHASE 11
SWMP-JANUARY 2012
Indicate the project pollutants of concern (POCs).
Joble 7. Grouping of Po iential Pollutants of Concern (POCs) by fate durinc stormwater treatmi
Pdlutant Check
Project
Specific
POCs
Coarse Sediment
and Trash
Pollutants that tend
to associate with
fine particles
during treatment
Pollutants that tend
to be dissolved
following treatment
Sediment X X
NiJrients m X X
Heavy Metals X
Organic Compounds X
Trah & Debris X
0)(ygen Demanding X
Bacteria X
Oil& Grease X
Peiticides X
15
I CARLSBAD RANCH PA 5 - MARBRISA PHASE il
SWMP-JANUARY 2012
V\. Operation and Maintenance
Ihese Stormwater treatment facilities (blo-retentlon) ore as port of the project subject to be verified
br effectiveness and proper performance. As discuss in Chapter V section 5,3, these LIDs are
dentified as follows:
bble 8, Project Specific LID and TC-B MPS
BMP
Identifier*
LID or TC-BMP
Type
BMP Pollutant
of Concern
Efficiency
(H,M,L)-
Table 11
Final
Construction
Date
(to be completed by
County inspector)
Final
Construction
Inspector Name
(to be completed by
County
inspector)
IMP I Bio-retention H, H,M
IMP II Bio-retention -H, H,M
IMP III Bio-retention H, H,M
IMP IV Bio-retention H, H,M
IMP V Bio-retention H, H,M
INJointenance wiii be under the guidelines as shown In the "STORMWATER MAINTENANCE PLAN" bythe
County of Son Diego DPW Land Development Guidelines, and the Citv of Carlsbad JURMP, The
owners of the proposed deveiopment will eventually be responsible for the maintenance and
inspection ofthe Post-Construction BMP's,
Al approved contractor will be hired to pump or clean any inlet or inline treatment manholes ofthe
trapped stormwater wastes. Said contractor will haul wastes to on approved disposal site,
Stormwater sampling and monitoring will be the responsibility of the owners. They will also be
responsible in determining the sources and locations of pollution If discovered dunng sampling and
nnonitoring. The owners will need to assess on annual maintenance and inspection/monitoring fee
for the upkeep of any Post Construction BMP's,
For landscaping maintenance, the owner will monitor the compliance and maintenance of all
vegetated areas as on efficient post construction BMPs, See also. Landscaping under Source
Control BMP for more details.
Responsible Party for Long-term Maintenance:
identify the parties responsible for long-term maintenance of the BMPs identified above and
Source Controls specified in Attachment B, Include the appropriate written agreement with the
entitles responsible for O&M In Attachment F, Please see Chapter 5 "Private Ownership and
Maintenance" on page 94 of the County SUSMP for appropriate maintenance mechanisms.
Name: Timothy J. Stripe
Company Name: Grand Pacific Resorts, INC,
Phone Number: (760)431-8500
Street Address: 5900 Pasteur Court, Suite 200
City/State/Zip: Carlsbad, CA 92008
Email Address: tstripe@grandpacificresorts,com
16
I
Attachments
1
A. Stormwater Standard Questionnaire (SWSQ)
And Construction Threat Assessnnent Form
1
CITY OF
ARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www,carlsbadca,gov
INSTRUCTIONS:
To address post-development pollutants that may be generated from development projects, the City requires that new
development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management
Practices (BMP's) into the project design per the City's Standard Urban Stormwater Management Plan (SUSMP), To
view the SUSMP, refer to the Engineering Standards (Volume 4, Chapter 2) at www,carlsbadca.qov/standards.
Initially this questionnaire must be completed by the applicant in advance of submitting for a development application
(subdivision, discretionary permits and/or construction permits). The results 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 F?equirements'. 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 wiii result in the return of the development application as incomplete. In this case, piease
mal<e 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.
bbCTION 1 NEW DEVELOPMENT ~
Does your project meet one or more of fhe following criteria: YES NO
1. Housina subdivisions of 10 or more dwellina units. Examples: sinqle familv homes, multi-familv homes,
condominium and apartments V 2. Commercial - areater than 1-acre. Anv development ottier than heavv industn/ or residential. Examples: hospitals:
laboratories and other medical facilities; educational institutions; recreational facilities; municipal facilities; commercial
nurseries; multi-apartment buildings; oar wash facilities; mini-malls and other business complexes; shopping malls;
hotels; office buildings; public warehouses; automotive dealerships; airfields; and other light industrial facilities.
/
V
3, Heavv Industrial 1 Industrv- areater than 1 acre. Examoles: manufacturina plants, food orocessina plants, metal
working facilities, printing plants, and fleet storage areas (bus, truck, etc). V
4, Automotive repair shop. A facilitv cateaorized in anv one of Standard Industrial Classification (SIC) codes 5013,
5014, 5541, 7532-7534, and 7536-7539
5, Restaurants. Anv facilitv that sells prepared foods and drinks for consumption, includina stationary lunch coiintRrs
and refreshment stands selling prepared foods and drinks for immediate consumption (SIC code 5812), where the
land area for development is greater than 5,000 square feet. Restaurants where land development is less than 5,000
square feet shall meet all SUSMP requirements except for structural treatment BMP and numeric sizing criteria
requirements and hydromodification requirements.
E-34 Page 1 of 3 REV 1/14/11
•A
^ CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www,carisbadca,gov
6, Hillside development. Anv develooment that creates mnre than E nnn .<!qiiarR feet nf impervinu.t; siirfar^p and i-;
located In an area with known erosive soil conditions, where the development will grade on any natural slope thaf is
twenty-five percent (25%) or greater.
7. Environmentallv Sensitive Area (ESA)'. All develooment located within or directiv adfacent^ to nr rii.sr.haminq
directly' to an ESA (where discharges from the development or redevelopment will enter receiving waters within the
ESA), which either creates 2,500 square feet or more of impervious surface on a proposed project site or increases
the area of imperviousness of a proposed proiect site 10% or more of its naturally occurring condition. /
8. Parkina lot Area of 5.000 sauare feet nr more or with 1fi nr mnre parking spare-; anrt pntpntially evpnceH tn iirhan
runoff
9. streets, roads, hiahvtavs, and freev/avs. Anv paved surface that is 5.000 sauare feet or areater u.sed fnr the
transportation of automobiles, trucks, motorcycles, and other vehicles
10. Retail Gasoline Outlets. Servina more than 100 vehicles per dav and areater than 5.000 square feet y 11. Coastal Development Zone. Anv oroiect located within 200 feet of the Pacific Ocean and (11 create."; mnre than
2500 square feet of impervious surface or (2) increases impervious surface on property by more than 10%.
12. More than 1-acre of disturbance. Proiect results in the disturbance of 1-acre or more of land anri i.s nnnsiriereri a
Pollutant-generating Development Projecf",
1 Environmentally Sensitive Areas inciude but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special
Biological Significance by ttie State Water Resources Control Board (Waler Quality Control Plan for ttie San Diego Basin (1994) and amendments); water bodies
designated with the RARE beneficial use by ttie State Water Resources Control Board (Vi/ater Quality Conlrol 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 sensilive areas which have been identified by the Copermittees,
2 "Directly adjacent" means situated wilhin 200 feel 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 deveiopment or redevelopment site, and
nol commingled with flow from adjacent lands.
4 Pollutant-generating Development Projects are those projects Ihat generate pollutants at levels greater than background levels. In general, these indude 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 thai are for infrequent vehicle use, such as emergency or mainlenance
access, or for pedestrian or bicycle use, are nol considered Pollutant-generating Development Projects if they are built wilh pervious surfaces or if they sheet flow to
surrounding pervious surfaces.
INSTRUCTIONS::
Section 1 Results:
If you answered YES to ANY of the questions above, your project Is subject to Priority Development Project requirements. Skip Section 2 and
please proceed to Section 3, Check the "meets PRiORITY DEVELOPMENT PROJECT requirements" box in Section 3, Additional storm water
requirements will apply per the SUSMP.
If you answered NO to ALL of the questions above, then please proceed to Section 2 and follow the instructions.
E-34 Page 2 of 3 REV 1/14/11
CITY OF
CARLSBAD
STORM WATER
STANDARDS
QUESTIONNAIRE
E-34
Development Services
Land Development Engineering
1635 Faraday Avenue
760-602-2750
www.carlsbadca.gov
SECTION 2 SIGNIFICANT REDEVELOPMENT
INSTRUCTIONS: Complete the questions below regarding your project YES NO
1. Project results in the disturbance of 1 -acre or more of land and is considered a Pollutant-generating Development
Project *?
INSTRUCTIONS: If you answered NO, please proceed to question 2.
If you answered YES, then you ARE a significant redevelopment and you ARE subject to PRIORITY DEVELOPMENT PROJECT
requirements. Please check the "meets PRIORITY DEVELOPMENT PROJECT requirements" box in Section 3 below.
2. Is the project redeveloping an existing priority project type? (Priority projects are defined in Section 1)
INSTRUCTIONS: Ifyou answered YES, please proceed to question 3.
If you answered NO, then you ARE NOT a significant redevelopment and your project is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box in Section 3 below.
3. Is the work limited to trenching and resurfacing associated with utility work; resurfacing and reconfiguring surface
parking lots and existing roadways; new sidewalk; bike lane on existing road and/or routine maintenance of damaged
pavement such as pothole repair? Resurfacing/reconfiguring parking lots is where the work does not expose underlying soil
during construction.
INSTRUCTIONS: If you answered NO, then proceed to question 4.
If you answered YES, then you ARE NOT a significant redevelopment and your project is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box in Section 3 below.
4. Will your redevelopment project create, replace, or add at least 5,000 square feet of impervious surfaces on existing
developed property or will your project be located within 200 feet of the Pacific Ocean and (1) create 2500 square feet or
more of impervious surface or (2) increases impervious surface on the property by more than 10%? Replacement of
existing impervious surfaces includes any activity that is not part of routine maintenance where impervious material(s) are
removed, exposing underlying soil during construction.
INSTRUCTIONS: If you answered YES, you ARE a significant redevelopment, and you ARE subject to PRIORITY DEVELOPMENT
PROJECT requirements. Please check the "meets PRIORITY DEVELOPMENT PROJECT requirements" box in Section 3 below. Review
SUSMP to find out if SUSMP requirements apply to your project envelope or the entire project site.
If you answered NO, then you ARE NOT a significant redevelopment and your project is subject to STANDARD STORMWATER
REQUIREMENTS. Please check the "does not meet PDP requirements" box in Section 3 below.
•for definition see Footnote 4 on page 2
SECTION 3 QUESTIONNAIRE RESULTS
•
My project meets PRIORITY DEVELOPMENT PROJECT (PDP) requirements and must comply with addilional 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 (hydromodiflcation) 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
Applicant Information and Signature Box
Addres^gQQ Pasteur Court # 200
Carisbad, CA92008
Assessor's Parcel Number(s):
211-131-05, -06, -07, -09
Applicant Name:
Timothy J, Stripe ^
Applicant Title:
Co-President
A^^\\caijt Signature: Date: ,
E-34 Page 3 of 3
This Box for City Use Only
City Concurrence: YES
By:
Projecf ID:
REV 1/14/11
^ CITY OF
CARLSBAD
CONSTRUCTION THREAT
ASSESSMENT WORKSHEET FOR
DETERMINATION OF PROJECT'S
PERCEIVED THREAT TO
STORM WATER QUALITY
E-33
Development Sersilces
Land Development Engineering
1635 Faraday Avenue
760-602-275O
ww/w.carisbadca,gov
Construction
SWPPP Tier
Level
Construction Threat Assessment Criteria*
Perceived
Threat to
Storm Water
Quality
Tiers
Tier 3 - Hiah Construction Threat Assessment Criteria
Tiers
lj Project site is 50 acres or more and grading will occur during the rainy season
• Project site is 1 acre or more in size and is located within the Buena Vista or Agua Hedionda
Lagoon watershed, inside or within 200 feet of an environmentally sensitive area (ESA) or
discharges directly to an ESA
• Soil at site is moderately to highly erosive (defined as having a predominance of soils with
USDA-NRCS Erosion factors kf greater than or equal to 0,4)
• / Site slope is 5 to 1 or steeper
QT Construction is initiated during the rainy season or will extend into the rainy season (Oct, 1
through April 30),
• Owner/contractor received a Storm Water Notice of Violation within past two years
Tiers
Tier 3 - Medium Construction Threat Assessment Criteria IVIedium
Tiers
• All projects not meeting Tier 3 High Construction Threat Assessment Criteria
IVIedium
Tier 2
Tier 2 Hiqh Construction Threat Assessment Criteria
High
Tier 2
• Project is located within the Buena Vista or Agua Hedionda Lagoon watershed, inside or
within 200 feet of an environmentally sensitive area (ESA) or discharges directly to an ESA
• Soil at site is moderately to highly erosive (defined as having a predominance of soils with
USDA-NRCS Erosion factors kf greater than or equal to 0.4)
• Site slope is 5 to 1 or steeper
• Construction is initiated during the rainy season or will extend into the rainy season (Oct. 1
through April 30).
• Owner/contractor received a Storm Water Notice of Violation within past two years
• Site results in one half acre or more of soil disturbance
High
Tier 2
Tier 2 - Medium Construction Threat Assessment Criteria . Medium
Tier 2
• All projects not meeting Tier 2 High Construction Threat Assessment Criteria . Medium
Tierl
Tier 1 - Medium Insoection Threat Assessment Criteria
IVIedium
Tierl
• Project is located within the Buena Vista or Agua Hedionda Lagoon watershed, within or
directly adjacent to an environmentally sensitive area (ESA) or discharges directiy to an ESA
• Soil at site is moderately to highly erosive (defined as having a predominance of soils with
USDA-NRCS Erosion factors kf greater than or equal to 0.4)
• Site slope is 5 to 1 or steeper
• Construction is initiated during the rainy season or will extend into the rainy season (Oct. 1
through April 30).
• Owner/contractor received a Storm Water Notice of Violation within past two years
• Site results in one half acre or more of soil disturbance
IVIedium
Tierl
Tier 1 - Low Insoection Threat Assessment Criteria Low
Tierl
• All projects not meeting Tier 1 Medium Construction Threat Assessment Criteria Low
Exempt - Not Applicable -Exempt
where it can be shown that a lesser or higher amount of storm water compliance inspection is warranted in the opinion of
the city engineer
E-33 Page 1 of 1 REV 4/30/10
B. Post-Construction BMP Exhibits
C. DMA/ TC-BMP Sizing Exhibit
DRAINAGE MANAGE AREAS (DMAs)
The entire project area is divided into individual Drainage Manage Areas (DMAs). This delineate is done
by following grade brakes and roof ridge lines. In general, there are 3 outfalls in the post-development for
this project. Tributary area basin 1 represents the flow that drains to the OUTFALL 1 (south), Tributaiy
area Basin 2 drains to OUTFALL 2 (Southeast), and Basin 3 drains to OUTFALL 3 (east). In post-
development this three tributary areas are divided into sub-areas based on the proposed surface shape and
the existing topography. These three outfalls ultimately will confluence at the down streain in an existing
5 x4 storm drain cleanout.
Basin 1 is the area that drain to Integrated Management Practice (IMP I), Basin 2 some wiU be treated in
IMP II and the third drains to IMP III, IV and V and then to an existing stormdrain system.
Drainage Management Areas Tabulation
Self-treating Areas on Slope (ST)
DMA NAME AREA
Slope 1 22,320
Slope 2 17,951
Slope 3 8,032
Slope 4 2,518
Slope 5 12,053
Slope 6 925
Slope 7 6,287
Slope 8 17,340
Slope 9 9,840
Self-treating Areas on Landscape (ST)
DMA NAME AREA
Pool Area 7,300
Villa 70 7,491
Villa 69 8,121
Villa 68 13,024
Villa 67 12,383
Villa 66 13,555
Villa 65 16,569
Villa 64 8,266
Villa 63 10,670
Villa 62 7,323
Villa 61 8,151
ViUa 60 10,076
Villa 59 8,280
Villa 58 10,382
Villa 57 6,251
Areas Draining to IMPs
The Drainage Management Areas (DMAs) are multiplied by a sizing factor to calculate the
required size of the IMP and Most of these DMAs drain to IMPs. Due to its location, more than
one type of surface drain to the designated IMP. Turf or landscaping is included in deternoining
the size of the bio-retention facility.
A Area = (pervious area) x (runoff factor) x (sizing factor)
Project Name: Marbrisa - Phase II
Areas Draining lo IMP II
DMA
Name
DMA
Area
Post-
project DMA
DMA
Area
X Soil Type:
(square
feet)
surface
type
Runoff
factor
runoff
factor B Bio-retention IMP II
Street inlet 51 7,248 A/C 1.0 7,248
Street inlet 53 6,352 A/C 1.0 6,352
Street inlet 57 7,352 A/C 1.0 7,352
Street inlet 60 5,288 A/C 1.0 5,288
Street inlet 63 12,031 A/C 1.0 12,031
Street inlet 65 5,244 A/C 1.0 5,244
Street inlet 67 7,985 A/C 1.0 7,985
Street inlet 70 8,437 A/C 1.0 8,437
Villa 58 7,762 Roof 1.0 7,762
Villa 59 8,214 Roof 1.0 8,214
Villa 60 8,443 Roof 1.0 8,443
1/2 Villa 66 3,883 Roof 1.0 3,883
1/2 Villa 67 3,430 Roof 1,0 3,430
Villa 58 10,382 Landscape 0,1 1,038
Villa 59 8,280 Landscape 0.1 828
Street Access 12,031 AC/ sidewalk 1.0 12,031
Villa 60 10,076 Landscape 0.1 1,008
Slope 2 17,951 Landscape 0.1 1,795
Slope 5 12,053 Landscape 0,1 1,205
Slope 6 925 Landscape 0.1 93
Slope 7 6,287 Landscape 0.1 629
Slope 9 9,840 Landscape 0.1 984
Sales Building 5,474 Hardscape 1.0 5,474
Villa 67 5,736 Landscape 0.1 574
BBQ area + walkways 722 Concrete 1.0 722
Walkways 700 Concrete 1.0 700
-
-IMP Minimum Proposed
Sis;ing
Factor
Area
(SQFT)
Area
(SQFF)
TOTAL 192,126 118,749 0.04 4,750 4,900
Project Name: Marbrisa - Phase II
Areas Draining to IMP I
DMA
Name
DMA
Area
Post-
project DMA
DMA
Area
X Soil Type:
(square
feet)
surface
type
Runoff
factor
runoff
factor B Bio-retention IMP I
Street inlet 2 4,412 A/C 1.0 4,412
Street inlet 4 6,414 A/C 1.0 6,414
Street inlet 6 10,854 A/C 1.0 10,854
Street inlet 12 8,470 A/C 1.0 8,470
Street inlet 13 4,359 A/C 1.0 4,359
Street inlet 15 5,831 A/C 1.0 5,831
Street inlet 22 10,280 A/C 1.0 10,280
Street inlet 23 16,940 A/C 1.0 16,940
Slope 1 22,320 Landscape 0.1 2,232
Villa 61 7,811 Roof 1,0 7,811
Villa 62 7,837 Roof 1.0 7,837
Villa 63 8,464 Roof 1.0 8,464
Villa 64 6,088 Roof 1.0 6,088
Villa 65 7,725 Roof 1.0 7,725
Villa 68 7,762 Roof 1.0 7,762
1/2 Villa 66 3,879 Roof 1.0 3,879
1/2 Villa 67 4,335 Roof 1.0 4,335
Gym 1,651 Roof 1.0 1,651
Restroom 2,087 Roof 1.0 2,087
Pool Area 49,367 Hardscape 1.0 49,367
Villa 69 7,762 Roof 1.0 7,762
Villa 70 7,762 Roof 1.0 7,762
Villa 61 8,151 Landscape 0.1 815
Villa 62 7,323 Landscape 0.1 732
Villa 63 10,670 Landscape 0.1 1,067
Villa 64 8,266 Landscape 0.1 . 827
Villa 67 13,215 Landscape 0.1 1,322
Villa 68 13,024 Landscape 0.1 1,302
Villa 69 8,121 Landscape 0.1 812
Villa 70 7,491 Landscape 0.1 749
Pool Area 7,300 Landscape 0.1 730
Slope 8 17,349 Landscape 0,1 1,735
Villa 65 16,569 Landscape 0.1 1,657
Walkways 1,120 Concrete 1.0 1,120
BBQ area + walkways 632 Concrete 1.0 632 IMP Minimum Proposed
.
Si'^ng
Factor
Area
(SQFTO
Area
mv
TOTAL 331,641 205,822 0.04 8,233 8,300
Areas Draining to IMP III
DMA
Name
DMA
Area
'Post-
project DMA
DMA
Area
X IMP Nam
(square surface Runoff runoff
feet) type factor factor B Bio-reteiitioa
1/2 BIdg 57 5,442 Roof I.C 5,442
IMP
Si^ngFactor
Minimun
Area
sq.ff
IMP
Proposed Area
sq.ft.
IMP
Si^ngFactor
Minimun
Area
sq.ff
IMP
Proposed Area
sq.ft.
IMP
Si^ngFactor
Minimun
Area
sq.ff
IMP
Proposed Area
sq.ft.
5,442 0,04 218 220
Areas Draining to IMP IV
DMA DMA Post-
Name Area project DMA
DMA
Area
X Soil Type: IMP Name
(square surface Runoff runoff
feet) type factor factor B Bio-retention
1/2 BIdg 57 5,442 Roof 1,0 5,442
IMP
Si^ng Factor
Minimun
A^rea
sq.ft.
IMP
Proposed Area
sq.ft.
IMP
Si^ng Factor
Minimun
A^rea
sq.ft.
IMP
Proposed Area
sq.ft.
IMP
Si^ng Factor
Minimun
A^rea
sq.ft.
IMP
Proposed Area
sq.ft.
5,442 0,04 218 220
Areas Draining to IMP V
DMA
Name
DMA
Area
Post-
DMA
DMA
Area
X IMP Name
(square surface Runoff runoff
feet) type factor factor B Bio-retention
Driveway 13,668 Roof 1.0 13,668
Slope 4 2,518 Landscape 0.1 252
IMP
Sisjng Factor
Minimun
Area
sqff
IMP
Proposed Area
sq.ft.
IMP
Sisjng Factor
Minimun
Area
sqff
IMP
Proposed Area
sq.ft.
IMP
Sisjng Factor
Minimun
Area
sqff
IMP
Proposed Area
sq.ft.
13,920 0.04 557 560
W/I/EF DEPTH MRIES
1.23' -t.i
mt UAINTAmO) CAUFOiNIAN DROUGHT TOLERAHT
' GRASSES AND miMFLOWERS
. 12" SaiD PVC aEANOUT EVERY 50 Fl |«i
mm ATRIUM GRATE, TG 12'HIGHER THAN
FS (TYP)
.18'UIN TOPSOIL WITH HIGH SAND
(60-80X) AND
UUIT aAY(IO-20X) CONTEfIL
7%-14X
±14'-20'TO TOE OF SLOPE
" P£RFORA TED PVC SO. 75X CONNECT TO
ACTION F-F ^' '^'^^ '^^ DomiSTREAU
Bia-RETENTION SWALE WfTH UNDERDRAIN PIPE
FROU STA 4+7a00 TV 8-I-76.84
NOT TO SCALE
WATER DEPTH VARIES 1.28' - 1.50'
UAX PONDING ELEV: 177.04
48'EXISTING RISER RIU:17S.77
CUT OFF TO ADJUST TO THE NEW RIM: 176.00
AND RE-ATTACH THE GRATE ASSEUBL Y
12' SOJD PVC CLEANOUTEifT^Y 50 FT
MTH ATRIUU GRAIE, TG 12' HIGHER IHAN
FG (TYP)
FILTER FABRIC KITH PERUEABILITY
GREATER THAN 10 INCHES PER HOUR
OR PER SOIL ENQNEER RECOUUENDATION
^ Y CRUSHED-^ /
CRAVa
12'PERFORATED PVC SO.75XCONNECT TO
A 48' RISER AT IHE DOmiSTREAU
TYPICAL LONGITUDINAL SECTION
OF THE BIO-RETENTION SWALE
NOT TO SCALE
,<\\ViHIGHESr
NOTEA:
CREATE NEW PERFORATION HOLES AT THE EdSTING RISER PIPE AU PERFORAIEO HOLES SHALL BE 2'
PERFORATIONS HaES SHAU BE A UINIUUU OE 8-2' HaES AT ELEV I7J.25, ELEV 174.25 AND ELEV
175.25. PROVIDE UESH SCREEN Om OPENING
6" SOLii) PVC CLEAmiJT EVEifY ...
/5 FT. miH AWmi GffAlg TG \
't" Ht(.:H£H Th'AN I'.:
1,5'
^ i'/ELL MAINTAINED CALIFORNIAN DROUCHl
/ TQLEPAIIT
10
_I?'U"'I '''P rr,' mTfi HIGH SAiJO
fEO-SO'X) ANS
IMT OA Y (fO-POZj CONTENT
i" CRUSHED
GNAm. IMP fV
ACTION H-H
BIO-fSTENTim DEPTH (IW)
' NOT TO SCALE
4-PERFORATED PVC CaVNECT TO
6" SaiD HDPE ATDOmSTFEAM
mOE CURB OPENING .
E'.fRY IG FEET
——^i;*^ /• -V-M -
1 5'
imi UA/NTAINED CAUFCRNUN DROUGHT
/ TOLERANT
/ GRASSES ANO mLDFLOY£PS
1 5'
'IMP V • • /•
IB- Wll TOP SOIL mm HIGH SAW SECTION I-l
(MS-SOX) .AND ad-REm'im 'dpm (TYP)
' '> f < -V 'tA.ih ^EERY
4 'it'Jt/^ ' '.-r i^y'-' 'JNIlECT TO
12" HDPE AT THE DOiWilSTPE.W
UUIT GAY (;0-20Xj CONTENT
NOT TO SCAlE
D. BMP Product Information and Educafional Materials
Stormwater and the Construction industry
Protect Natural Features Vegetative Buffers
Silt Fencing
• Minimize cieanng- ^OOCi
• Minimize thc amount of exposed soil
• Identi fy and protect areas ^vhcre exisiine vegeuiion, ^uch as
trees. w[ll not be disturbed bv construaion acuviiv
- Protec: streams, stream buCfers, wild woodland^ \vetland'
or other sensicivc areas from any disturbance or consiru'ciion
activ Ity by fciiring or othci-wjse clearly marking these areas.
• Sequence consiruaionactjvities so that the soil is not exposed for long pcnods- of iime
• Scheduie or limit grading to small areas
Iii..iall key :.edimcnt control practices before .sice grading begins.
" Schedule iite stabilization aciivitics. such as landscaping,
to be completed immediately after the land has been'
graded to its final contour.
Good
Proteci and install vegetative buffers along waterbodies to
slow and filter stormwater runoff
Maintain buffers by mowmg or replanting periodically to
cnsu re iheir cffeciivcncs^
Site Stabilization
Good
Inspect and maintain silt fences after each rainstorm.
Make sure ihe bottom of ihc siJi fence is buried in rhe ground.
Securely attach the material to the stakes.
Don't place silt fences in ilic middle ofa waterway or USE (hem as a check dam.
Make sure stormwater is not tlowing around rhe silt fence.
Construction Entrances
Bad
aintain your BMPs!
m RIVERSIDE COUNTY....Cali 1-800-506-2555
TO REPORT ILLEGAL STORiVlDRAiN DiSPOSAL
^ E-mail: Flood.fcnpdesj^co.rtversi^le,^
Visit our website:.vvww.fioodbotitrol.co.riv§rsi^d^^
Brought toyou by tine StGrmWater/Clean Water Pollution
• Protection Program
REMEMBER, ONLY RAIN IN THE STORMDRAIN!
Slopes
Good
• Vcgratc, mulch, or oihcraisc stabilize all exposed areas is
soon as land alloraiions have bi;cn oompluLod.
Storm Drain Inlet Protection
Good
Rcmm'i: mud and din Irom the tires ol construction vehicles
before they enter a paved roadway.
• Propcrlv- .lize iintraticc BMI's for alj anticipaicd vehicles,
.^lukc sure thill ilic consirueiion cnirancc dots not bccomi;
buh&d in soil.
Dirt Stockpiles
Rough grade or lerract iilupes.
.V • • .V • •
Bad
• Break up long slopes with sediment hjrriers, or under
drain, or divert siormwaicr away from sli>pt;s.
Baa
Good
• Cover or seed all dirt stockpiles.
Gooti
- Use rock or other appropriate matenal to cover tbe storm
drain inlet to filter out trash and debris.
- Make sure the rock size Ic approprime (u&ually
- Ityou uso inlet liltcra. mainiain Uicm regularly.
WWW. epa. gov/npdes/menuofbmps
ttormwater and the Construction Industry
, Planning and InWkmmting Erosion and .W)>M^«> C^^^^J R
3hi: u>n«triii.'lii>n Inauiity H • cHtlBul tiarllciimni m the .
WBtlaridK, and iH:uini. ThmuKh ihu um: of best mana^muni
IC key del'rnse iKaiiiii ertMlun itiid icJimEniuiiijn..
I slurmwaier (few over a contraction KI'K, it picks up polluranu Ulc* ledi
ilunicsufsiorn;waterc»nalsu,caua;jiitani bankcrciion,anJ Jcsimv Jownsircara
(«irvn Mntl sedimchcalitin tj an importJirt rcsponsititli^y"iit all conslniction .-
1 addition in rhC^tiivironniEnlal impati, uiic6ntrfiIli;d;crosfnnScah ,la»e''a sfgnifitani:nnaneial-
vistruei;..!! pmjetfL U cn«s niimcy-and limt in rcnaii- KuI1i•«,;VcpVa^c\^6tlUl^n/clean7^eJin
rams. rEpl»cc fKWrly installed BMPs. -Jiid miuBaw dimape lo piher people's propcrcy ot w natural
cvunlirtifioil!.
lo what's being done obout poliuted runoff?
-hcUpn '^=l^^cllndt.dcslhENa.lonaU'ol1u^antpischa.pcL1in.inalion.Sy^-lcm^NroIiS>pcrmi^u
\s of January :(I03, 44 Maic-s and rcrritorii:s-ar. authorised to issuo Nl'TlES ^lorm^™[Br pcni.iK iVyourMalt isn't
uihorlitd lo operate ih= NPDEi Klonn*-at<a; perjriiv jiri.-.[;rjra. EP.\ issucj ihe permiu. Permits varv fruco stale to
tate, *o rontacij-aursiaKor EI'A larspeciiIc;iTtiQcm»tio». Yotii perm itti uy auth'orily liMspea'fic ir
iiur Mail. > NI'DhS lU'rniMulcr perntil pr...^nim. tu tfcntml, ,:unstruciiuii ncrmiis ruuuii.;
•>diallf.fll,clnllr-Hn'nK!
• Develop ind iniplemtnt a
• iubinit a pertnii apphiitm
• Cooitilv Willi ihc permili ir
iMormwatcrpiilluiionpreveuiien plan.
iorncnia:ol'inicnt'CNOi). •',
LiuJinn maintaminft H.MF'K and iiispe,.:tinR ihi
Under ihc NPDtS prOBrara, consiiuei
aerrnic ctiveraitcScaies have diflercot .tliviiiei.cha.1 disturb I o
a for the plsuii lliir cons'
• MortnM-alcr pollution prevention plan •
• EttJSioniind sedimcnlciintrol plan
• Erfsmn eontroi and stormwater laanaciimcm [ilun
• :^(orni-.\-atsriiianai;«ment plau ••
• . VTalirr polJuuon-coiHtol plao
• rnlluLU-n prcvenU"n plan - .
CTcsarc tei^uircd iijBfanin siorr
operator! must develop, such »
l think 1 need a per mil:
.Ml UnU-diKturtiinf!
In be covered under
. Where do.l start? -
c>,inLludinKcleanii&Ki^d.tiftatidcx(:>i,9llhn,rhai:disiurb LormoKicru'arCreijuircd''
lrEPAMsracdNI•DK-;onl^uc^lon^^o.rlT)l^•alcrp^:rraflpri
. . • - . -^'*'"'^y"°*'^"h"!e-'F')?^t^':iU(;cequirt:rnen7uny.Jijj'^
loi-jlLcoiionandKLdtmcniconlrol rcjutti.mMii.tujulUKioc'.n rrClMstMiufroratJicrcquircniciHsortbcKPDU
protein at tht siaie or U'\le%el Sithough vou mtuteotrrly «uh*H.th ^tsorre.ju.r.:mcnl». r,io«l c»s« thti) have
bt..nde^,EncdvohecumpiemeQnrr.Contacry^r p<:rmitunKau*ori|-y:to limlourc^aciIriiKit wuri^rtid^:^^^
p!.ce lo jt-rt your search Uie ^.unstructuju InJtisirv.GorllplijDGe j\ssi»ance wib liltiljii/l'wjvWcny.^o^ikTf:
The NPDES permit requireniMiti todude 'sttiill «.nnni<hion ^^ti lUes thai are pan ol a^larfier ctimnioii plao ot
dl- .Uopmcnt I r *4Li_ «.ch 4» » .in^le bt uilhi.t a ] irt-j-yuWiv.j.un 1 »t>»i.lopm^ins wtlU mullipkijiH.™itirs, *\\
npcr.i-.r^ muM ha^t permit cnve^Rc for d.tir individual jAns nl iht. lir^cr dcvdnpnicni, ooJ^ialwf hoi^^Otc n-
-raall citi-h operitwn happcrn, ro h<„ When iW^re rauliipk .>perii(m"«i naes.ic, thcv r^m^n
and share ••ncci.mprehtnuve Plan and nhtain permTicnveriiKcaVikCpi'nniiii^:'-*"^ " '
Tne owner or operator of the co/istruction *iu; .it rtapoiisiWe for compPwnif.-:-
Hich tlicrciiuirtmenlsolthepennitlUiponsibililici ihaiiJe Jfeveiiiprni-aPlaij-'^v •
oblrtiniiig permit covcraec, implcmeniinE BMl's,irid siabilizinptid iiifc:Mt i&e^ii^
Determine your eiigibiiity
All cniiscruciioii k.-(iviiy ilm ilisturbN I or mot
pari ofa iarfier conimon plan at Jevelopmeni, Ttit-riund, M w-cll as acuyiiy thai distuVhs jtiis-diaii J.^'i^ I
it'Oblain pefmii iLaverage.-":. ''.,. '-- . •"• "..J'.t f^^i ->"-'i".V;:
Read arid uriderstanol your stormvi-aler periTiitirequiremeni •
ajid a permil application {ur rouce of in i«nl forml Trom or \\V\ ptrn.il
Develop a Pla
e Lhal iclk '
-.ccp ihc nan. on site. It ihst'^
std bv the perralllinj; attlhoruv
lou 11 nc^d in p.-,M » copy os yr.ur completed applicanon i>n site. Pui it in a place where the public can «e it si'
Ihey !l fcnow >-c.ur mc is cnvcicd bvan NPnii.S permit'
Apply for permit coverage •
appliLHtU.n Cor nD!'...c ol inicntj lOTOUr'pcrmuirirBUulliQ^itv. "l itis tnu'fi be "done bclivc'bcninnit.K'iinrhmd'
jouVc jubmit.i.-d ihc appiication. •,ou must saiisfy die condiiions-df ihc ptrrnK.
Implement the Plan
m^/r^rn'r^WnjrrJrrr' T "'^^V" '^•^"^"•ueiii.n begins. Ensure ihaf ILMPs nre pr,-.pc,lv
Developing and Implementing a Plan
V>.u muti^hav:. Pl«i lhal induJu er.nien and «Jinimi ammJ ind |K.lliiii,m prcyenii.m liMft. i bc« Ilao. rtquir.
- tj^i-p J „Jlmcni ixKiuol BMP* In plK. uniil ih= w„ i, peimantntlr .uLiliied
• [*i.lluii^ (irc\-eni!uo BMI'i Ui krep ihc consUttctiuD lilc -elcnn"
• K=s.il.r l„piaion (is^ciMmieiK-n Hi,.iu ,,rop<r in.i.lU.km .aJ m.in.««„ ,^ BMi^
1 ..nua«<lV, ih. „J ai^ura U..I ™«i i„duJ«J In V«Br l-lan ^ alrcadv r*« J Ol^.andard ,^..in( poK.
CoRstriKH en si tiTS th at d i «h g rge
tinpcrmltled siormwaicr oro In
vlolnllon Ql iho Cloon Woter Att
atitl may be subjcctto finct of up
10 SaZJOO a day por vlolaHon.
«!vcnlr.^^'!l'' ""f T'^^* m.plem<n.inK a IWlTwcs. a «alth infnnnalion -araiiabk on Oevdn^n. n.aii,ii„„
nt^M^^.«ltliLtl>>n p>n lfa»ailab|L^al wnJ>v,<^,,^^^^^^^^ • , . -npu ".i. 7m>,.rt. ,i
lIic3irw-nmJ.llii.-=i^iil".ciiiiiU-uei!Vni ihat v
Tek<Iunjrisiie'pUndc3i|(iiJd«i3jlnnc'j^^^
7. Evaluation and Design Development
OoUtct iXCtmfomatKO: • ' '
• t>«vclop«tepfanJeMcit ^ ->! m 1. ^ ^ 1 ^ ~
• trcpa^g^Untion prevention Hte map T <•
, Ihe.lim «i=n.'m,-pl-ecunn.«li'HanaiJ^; J^tnclbcrchiitireicri •
r mrt-nnailuni KlajliIyinE namr^'CatUra tliai:iliouiJ be pnHcdcd
_- prcp>nn;;a pi^DUiia^prefcnuon'inemap;/-^'.- -, -
2. ^S5ei5me"nr - -'
• Hea»iireitlic^iitt3fcal-'"'
• DetetmiDc (be drainage areas
• Calculate the runoff coc Hie lent
ITit nm «c|i it Hvcoinj ihc iinpael Ihc pniicci wit] mi m-tniirjUT luni-n l)ei
vil.HjUci, 1 uii-rc inr..im*iiim no cjlculatiis llic runun eii«llid<--nl. (.ui> wiwri"^ i; -
3. Control Selection and Plan Design
• Revtew and incorporate
• Select erosion aod sedii
• Select Olher coiilroU
• jctettstorni,i*atermana{;emcnlcontroU •
• Indicate Ihe location of [:ontrol3 on the f ile map
• Prepare an insccelion and maintenance plan
• Coordinate controls,with construction iictivity,
• Prepare seiti^cnec of innior accirities
111 Uic tl.ifJ KIT youll «iujll)' ilommti.i vnui prnd-Jurci ii< ptCTLOi uiJ i
dmuibcJ, inclmliiij; niiiol oarurjl ET™ lite jrieimiidc .rcmt llirtdplaini
joil eroitoii conlrol tljji...
e or local requirements
controls
lit »IKI idendtr die mcjsutcj lot BMI'il you'll u« to proL
ins I'uilnliiiul Ihcillile-JiTcfli
Jc.ii.miildi.indj.ei.1 ScJini
ilorawiiKr or pt=™i I.l &oiil.le:irai[!.Uie;iiu; iariliilt
(Iklcricci.icilimciilirapi^iciil'dirciiioni. -
YoUll ncul ic fdrct croiioa and icdiioirii oiniroli—
lncludinj;nabiliBijoii inoMiio r™ ptiV-cimB
luthed »rcK uidniiiaiiril oKttnli for Jiveulng niii-
yiw r 4™ iieulirtiic .in Ki »n'"!'n
lidlUEn
-..i'-icYCTir rKiori.^bui will be
ii;direedy ;hy"thc lite •chiracicruiin.
-. - — J-DU-iniclil tiwrider: an
tcniporiry sreiiijijiinnaiioii Vecdin^Taiid-niulejuQi
tenets, 3.1.1 scdiMi
allnfiiic
tiictuJc
i| irapi. N.. linglc BMI* will men
;l icdiimiiilalloii annaiA u^r eC •
i^biiiadcifi of B.M ri ji'tivrcniry.
M.na ihctyiKt 111 RMPiappriipri-
Oilier BMPs and Acllviliei la Control Potluled BunoH
4. Certification and Notification
• Certify (he Plan
• Submit permit application or notice of intent
Cince die rian>ias been ilei>cl,i)iiit, aa auilintiuil rcpnicnlaiive mini IIEII
il. Nmr il the time lo lubnil the perm'il applicaiiun or notice of mlenl.
YiMif permli mighi refloirt iliai the Man be kqM un -iie, «i be lUre Ci keep
il anilablc fur ihe sialf implemeni ins ll"* Plan
Erosion and
sedimentation controL
practices are only
ai good £Zi their
msTallation and
• • .vvt^:-^ maintenance.
^ 5. • Implementing and
Maintaining a Flan
* luiplciiienl COR troll
• Inspect and mamiaui eonlroU
• Updalc/chatigi; tbe Plan
f Rtpon releases uf hazardoun materials
Preconstruction Checklist
Implemenlolit
6, Completing the Project:
. . .Final Stabilization and
Tef inination of the Pei-rnit ,
• Final ilabilixation
• Notice o/Terminalioa
"'^ : • ^- Record retention
; Maiir iiHC><)iid iEl'A ieiiiiiie a Niiiice of Tirmiiitiien (N^OTj or
. nuliGaiiori-iiftriiTylns, ih»i. Die cnnsmislitii aeiii-iiy i< ^nniFliit
: NOTU faulted>lico'- -
• • nbai KBbiliaiiuD hiiib«naeliic«il ueal) pi^.mnif ihe
• for which the pcrmiuee is iciponiiblc.
• Sine Ml p,i-,n c,r,diK-»n; K.Vtl
- '^il.lU.M,h.»,.r,^,v.a.«t^i[,
• N«t»aiYchjnr=.-i! ih. Pbn
• '.Another open Llcnnum 0\-cT all aieai ul'llic illc
l>llizeii. Th*i Dperiinc wnalil iiced
in the perraiitiOKauihudly.
' • Fai'r«idniiilc<Muiru<njnDiial<;[tmi>wys^
- hn hv been compleled tvior 10 imjurErencr 1
••'n'leowner.wiili the tiQineinrnCTheinF maiV
••• v lO'iierform Gnid itabilliatiiiti. •
, I'erTsilteef 1DU1I keep a enpy ol^ifaarpcrmii appliea
- for ai louSvca^irotlovinRjiiiilsiatiilicuriia.Thisr
depraiiin): oo luic aod kical ii»|ulrcmcmi.
.in ounce of prevention is •wonh a pound of cure! It's far more efficient and cost-
effective to prevent pollulion than it is to try to correct problems later. InitalVmg and
nutintaining ximplii BMPs anil pollulion prevemion reclinlques on ji« can greatly
reduce the potential for stomrLoater pollution and can also save you money!
Visit 'wzuw.epa.gov/npdes/storm'water for more informati ion.
.';du/Ao3-eda-/A.\VM
• j3jeA\iiJJ0is/S3pdn/AoS-BdamAVrt
)|S!A JO , ,
^ SLormu'ater runoff occur:,
• from ram or snowmelt Ilott
^ -^^^^Ift , Inipervtoub surface like i
-r,l£. ^*-»:^-«'^"v,<' and streets prevent storm t-i
^'•y*?*'"1 natuialiy soaking into Ihc o i
Stormwater can pick up debns, chemicals, diit, and other
pollutants and flow into a storm sewer system or diiectfy tt
a lake, stream, river, wetland, or coastal water. Anything tha
enieisa storm sewer system is discharged untreated into
Ihc waterbodies we use for swimming, fishing, and pro. iJ n
drinking water.
Polluted stormwater lunoff can have
many adverse effects on plants, hsh.
animals, and people.
• Sediment can cloud the waler
and make it difficLilt or
impossible for aquatic plants to
grow Sediiment also can
destioy aquatic naoitacs.
• Excess nutrients can cause
algae blooms When algae die.
they sink to the bottom and decompose
in a process that removes o.\ygen from
the water. Fish and other aquatic
organisms can't exist in water with low
dissolved oxygen levels.
• Bacteria and other pathogens can wash
into swiinming areas and create health
hazards, often making beach closures
necessaiy
t Debris—piaslic bags, six-pack rings, bottles, and
cigarette butts—washed into waterbodies can choke, suffocate, or
disable aquatic life like ducks, fish, turtles, and birds,
t Household hazardous wastes like insecticides, pesticides, paint,
solvents, used motor oil. and other auto fluids can poison .iqiiatic life.
Land animals and people can become sick or die from eating diseased
fish and shellfish or ingesting polluted water
t Polluted stormwater often
affects drinking waler
-.•.•f&t sources. This, in turn, can
; affect human health and
>;•,.•.'•'- • increase drinking water
treatment costs.
itulliU ClI/l I I-J I'
Lawn care
i-fe. mia liiiull.
, :- i-M L-i
Excess ferUlirers
3iid pesticides
applied to lawns
and gardens wasli :
off ;ind pollute i,
streams. In . ,
addition, yard
clippings iind
leaves can wash
into storm drains and contribute
nulnenls and organic matter to streams.
» Don't overwater your lawn. Consider
using a soaker hose instead of a
sprinkler.
• Use pesticides and fertilizers
sparingly. Wlien use is necessary, use
these chemicals in the recommended
amounts. Use organic mulch or safer
pest conlrol methods whenever
possible.
• Compost or mulch yard waste. Don't
leave it in the street or sweep it into
stomi drains or streams.
• Cover piles of dirt or mulcfi being
used in landscaping projetts.
systems
isMiiSiSt;.-
Auto care
Washing your car and
degreasing auto parts at home
can send detergents and othei
contaminants through the
storm sewer system. Dumping
automotive fluids into storm
drains has the same result as
dumping the materials directly
into a waterbody,
• Use a commercial car wash that treats or
recycles its wastewater, or wash your car on
your yard so the water infiltrates into the
ground.
• Repair leaks and dispose of used auto fluids
and batteries at designated drop-off or
recycling locations.
Leaking and , :,|
poorly :'|
maintained , .
septic
systems release nutrients and
pathogens (bacteria and
viruses) that can be picked up
by stormwater and discharged
into nearby v/aterbodies.
Pathogens can cause public
health problems and
environmental concems.
• Inspect your system every
3 years and pump your
tank as necessary (every 3
.to 5 yearsl.
• Don't dispose of
household hazardous
waste in sinks or toilets.
•i-Pet waste
Pet waste can be
a major source of
bacteria and
excess nutnents
in local waters.
• Wlien vyalkmg
your pet,
remember to pick up the
waste and dispose of it
properly Flushing pet
Waste is the best disposal
method. Leaving pet waste
on the ground increases
public healtn nsks by
allowing harmful bactena
and nutrients to wash into
the stonn drain and
eventually into local
• waterbodies.
EdurKiti iittif'if-ii 'M,^if^i i ^'i
' / ^ \ I L i f ' ut t I
P^..,.,, -K.-iv -•—TrnditinnnI concrete and
cHSphnlt don't allow waler lo soak into the gioiuiti.
Instead these surfr-^ces rely on storni drains to
divert unwanted water l^rmeable pavement
.systems allow rain and snowmelt to soak ihrougfi.
decrea.sing stormwater runoff.
r;nfri iiarroi'-i—tou can
coHect rainwater from
rooftops in mosQuito-
proof containers The
water can be used kitei on
lawn ot garden a;e3.s.
' f I L —Specially ^ \^ ^^-^^ ^
designed areas planted
with native planls can provide natural places for
Mifiwaier to collect
SS'
rin.d soak imo thp
Ram froiTi
loftop areas or pavetl
.iip.is crin he diverted
mio these areas rather
1^1 I 10 storm drains,
-Filter strips are areas of Vesy^tsted riht-.r
native grass or plants createel along roadways or
streams. They trap the pollutants stormwater
picks up as it flows across driveways and streets.
Dirt, oil, and debns that collect in
parking lots and paved areas can be
washed into the storm sewer system
and eventually enter local
vi'aterbodies.
• Sweep up litter and debns from
sidewalks, driveways and parking lots,
especially around storm drains
* Cover grease storage and dumpsters
and keep them dean to avoid leaks.
• Repoit any-chemical spill to the local
hazardous waste cleanup team.
They'll know the best way to keep
spills from harming the enviromnent.
Erosion controls that aren't maintained can cause
excessive amounts of sediment and debris to be
carried into the stormwater system. Construction
vehicles can leak fuel, oil, and other harmful fluids
that can be picked up by stormwater and
deposited into local waterbodies-
< Divert stormwater away from disturbed or
exposed areas of the construction site.
» Install silt fences, vehicle mud removal areas,
vegetative coven and other sediment and
erosion controls and properly maintain them,
especially after rainstorms
• Prevent soil erosion by minimizing disturbed
areas during constmction projects, and seed
and mulch bare areas as soon as possible.
'•Mm -If
L5ck of vegetation on streambanks can lead to erosion. Overgrazed pastures can also
contribute excessive amounts of sediment to local waterbodies Excess fertilizers and
pesticides can poison aquatic animals and lead to destmctive algae b ooms^ Lvestock in
streams can contaminate waterways with bacteria, making them unsafe for human contact.
« Keep livestock away from streambanks and provide
them a water source away from waterbodies.
t Store and apply manure away from waterbodies and in
accordance with a nutrient management plan.
• \fegetate riparian areas along waterways.
• Rotate animal grazing to prevent soil erosion in fields.
' Apply fertilizers and pesticides according to label
instructions to save money and minimize pollution.
Improperly managed logging operations can result in erosion and
sedimentation.
Conduct prehareest planning to prevent erosion and lower costs.
Use logging methods and equipment that minimize soil disturbance.
• Plan and design skid trails, yard areas, and tmck access roads to
inmimlze stream crossings and avoid disturbing the forest floor
Construct stream crossings so that they minimize erosion and physical
changes to streams.
Expedite revegetation of cleared areas.
Uncovered fueling stations allow spills to be
washed into storm drains. Cars vvailing to be
repaired can leak ftiel. oil, and other harmful
fluids that can be picked up by stonnwatet
• Clean up spills immediately and properly
dispose of cleanup materials.
• Provide cover over fueling stations and
design or reliofil facilities for spill
contaiiiirieiU.
t Properly maintain fleet vehicles to prevent
oil. gas. and olher discharges Irom being
washed into local waterbodies.
• Install and niaintain oil,V,'ntcr scp,iialors.
i "OIK
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SmYfWattix Poiiiftion,., WM You Should Know
Riverside County has two drainage systems - sewers anti storm drains. The storm dram
system was designed to reduce flooding by carrying excess rainwater away from streets and
(Jeveloped areas. Since the storm drain system does not provide , ,• -, • ..
for waler treatment, it also serves the unintended function of ^--^^
tran-ipo.iing pollutants directiy to our local watenvays. -i'^- '--^ '"-5'^.
n t r stonn drains are not connectsd io a
r ! nt p 3/11 - thsy flow directiy to our ioca:
r o (/ es
Stormwater runoff is a part of the natural hydrologic process.
However, land deveiopment and construction activities can
significaritly alter natural drainage processes and introduce
pollutants into stormwater runoff. Polluted stormwater runoff from
construction sites has been identified as a major source of water
pollution in California, it jeopardizes the quality of our local
waterways and can pose a serious threat to the health of our
aquatic ecosystems.
'tfl Because preventing pollution is much easier and
less costly than cleaning up "after the fact," the
1 Cities and County of Riverside
I StormWater/CleanWater Protection Program informs
- residents and businesses on pollution prevention activities. This
pamphlet describes various Best Management Practices (BMPs) that construction
site operators can use to prevent stormwater pollution.
In accordance with applicable federal and state law, the Cities and County of Riverside have
adopted ordinances for stormwater management and discharge control thaf •xsMm the
discharge of pollutants into the storm drain system or local surface water. This includes
discharges from construction sites containing sediment, concrete, mortar, paint, solvents,
lubricants, vehicle fluids, fuel, pesticides, and construction debris.
i !• -:!.«? :-;OTi^-; The Federal, State and local regulations strictly prohibit the discharge of
sediment and pollutants into the streets, the storm drain system or watenways. As an owner,
operator or supen/isor of a construction site, you may be held financially responsible for any
environmental damage caused by your subcontractors or employees.
mm
iiiSTiWgfWM isTinrfsis
The two most common sources of
stormwater pollution problems
associated witti construction activities are
srosion -and sedimsntstiori. Failure to
maintain adequate erosion and sediment
controls at construction sites often results
in sediment discharges into the storm
drain system, creating multiple problems
once it enters local water.vays.
Construction vehicles and heavy
equipment can also track significant
amounts of mud and sediment onto
adjacent streets. Additionally, wind may
transport conslruction materials and
wastes into streets storm drains, or
directly into our local waterways.
il I'
?^r::'.'%?;i,ti^Vft^ vt5^^|silKi^ljSir;,;f|i I (IK t I j
• Remove existing vegetation only as s
needed. ; I
Schedule excavation, grading, and !
paving operations for dry weather j
periods, if possible. !
• i
..; Designate a specific area of the :
construction site, well away from i
storm drain inlets or watercourses, j
for malerial storage and equipment !
maintenance, j
.. > Develop and Implement an effective !
combination of erosion and I
sediment controls for the !
construction site. i
•,' Practice source reduction by
ordering only the amount of
materials that are needed to finish
the project.
J Educate your employees and
subcontractors about stormwater
management requirements and
their pollution prevention
responsibilities.
.J Control the amount of surface runoff
al the construction site by impeding
internally generated flows and using
berms or drainage ditches to direct
incoming offsite flows to go around
the site. W,-jfe; Consult iocs!
uniin-igu poHciet for more
}i}-\}ini3iion.
immmi n
The following Best Management Practices (BMPs) can signinoantly reduce "^"'f
vour construction site. Compliance with stormwater regulations can be as s™Pl«^^^^^^'""J'"?
ormwateroontac. with potential pollutants providing covers and secon ar^^^
construction materials, designating areas away fr°'",='°^'^,^^^J" =^=^1°s 1 materials and Implementing good housekeeping practices at the construction site.
..; Protect all storm drain Inlets and streams
located near the construction site to
prevent sediment-laden water from
entering the storm drain system.
j Limit access to and from the site. Stabilize
construction entrances/exits to minimize
the track out of dirt and mud onto adjacent
streets. Conduct frequent street
sweeping.
• Protect stockpiles and construction
materials from winds and rain by storing
them under a roof, secured im'permeable
tarp or plastic sheeting.
\ Avoid storing or stockpiling materials near
~" storm drain inlets, gullies or streams,
„j Phase grading operations to limit disturbed
areas and duration of exposure.
„i Perform major maintenance and repairs
of vehicles and equipment offsite.
• Wash out concrete mixers oniy in
designated washout areas at the
construction site.
3_ Set-up and operate small concrete mixers
on tarps or heavy plastic drop cloths.
! Keep construction sites clean by
removing trash, debris, wastes, etc. on a
regular basis.
\ Clean-up spills immediately using dry
clean-up methods (e.g,, absorbeni
materials such as cat litter, sand or rags
for liquid spills; sweeping for dry spills
such as cement, mortar or fertilizer) and
by removing the contaminated soil from
spills on dirt areas..
' 'i Prevent erosion by implementing any or a
"" combination of soil stabilization practices
such as mulching, surface roughening,
permanent or temporary seeding.
1 Maintain all vehicles and equipment ii
" ' good workmg condition. Inspect frequently
for leaks, and repair promptly
1 Practice proper waste disposal. Many
construction materials and wastes,
including solvents, water-based paint
vehicle fluids, broken asphalt and
concrete, wood, and cleared vegetation
can be recycled. Materials that cannotbe
recycled must be taken to an appropriate
landfill or disposed of as hazardotis
waste.
J Cover open dumpsters with secured tarps
or plastic sheeting. Never clean out a
dumpster by washing it down on the
construction site.
.j Arrange for an adequate debris disposal
schedule to insure that dumpsters do nol
overflow.
(Comttictiofi <i,ctiv!ti€!> Genera/ Permit)
The State Water Resources Control Board
(SWRCB) adopted a new Construction
Activities General Permit (WQ Order No. 99-
08DWQ) on August 19, 1999, superseding
the now expired SWRCB statewide General
Permit (WQ Order No. 92-08DWQ), This
permit is administered and enforced by the
SWRCB and the local Regional Water Quality
Control Boards (RWQCB), The updated
Construction Activities General Permit
establishes a number of new stormwater
management requirements for construction
sile operator,
HOTS: Some construction activies
stormwater permits are issued on a regional
basis. Consult your iocai RWQCB to find out if
your pmject requires coverage under any of
these permits.
/ t nt
i' I kt >
r ' I J '•I I. I'.:i!
Ye-! if construction activity results in the
disturbance offive or more acres ot toiai land
area or is part of a common plan of
development that results in the disturbance of
five or more acres.
, ' Cv .I'ti f
1 - ^ ll iL "
Obtain the permit package and submit the
SWRCB prior to grading or disturbing soii at
the construction site. For ongoing
construction activity Involving a change of
ownership, the new owner must submit a new
• 'NOI within 30 days of the date of change of
ownership. The completed NOI along with the
required fee should be mailed to the SWRCB.
What musi f do to compfy with
tiie requireinents of the
CoiaHfiJction Activities General
Pennii?
# Implement BMPs for non-stormwater
discharges year-round.
ft Prepare and implement a Stormwater
Pollution Prevention Plan (SWPPP) prior
to commencing construction activities.
Keep a copy of the SWPPP at the
construction site for the entire duration of
the project,
«! Calculate the anticipated stormwater run-
off.
Pi Implement an effective combination of
erosion and sediment control on all soil
disturbed areas.
Conduct site inspections prior to
anticipated storm events, every 24-hours
during extended storm events, and after
actual storm event.
•Si Perform repair and maintena,nce of BMPs
as soon as possible after storm events
depending upon worker safety
® Update the SWPPP as needed, lo
manage pollutants or reflect changes in
site conditions.
A Include description of post construction
BMPs at the construction site, including
parties responsible for long-term
maintenance.
NOTE: Piease refer to tlie Construction
Activities General Permit for detailed
information You may contact ttie SWRCB,
your iocai RWQCB, or visit tiie SWRCB
website at wm',mt:Qb:S^SS'i/StV'X!'Yl-':i 'o
oi3(a/n a Sfafe Construction Activities
Stormwater General Permit pacl<et
Woi-v iong is this ComtniCiinn
Adivities Genenii Fenrtii a:
effect?
The Permit coverage stays in effect untilyou
submit a Notice of Termination (NOT) to the
SWRCB. For the purpose of submitting a
NOT, all soil disturbing activities have to be
completed and one of the three following
criteria has to be met:
1. Change of ownership;
2. A uniform vegetative cover with 70
percent coverage has been established;
or,
3. Equivalent stabilization measures such
as the use of reinforced channel liners,
soil cement, flber matrices, geotextiles,
etc., have been employed.
Bioretention TC-32
Design Considerations
• Soil for infillration
• Tributary Area
• Slope
• Aestlnelics
• Environmenlal Side-effects
Description
The bioreten-tion best management practice (BMP) fimctions as a
soil and plant-based filtration device that removes pollutants
thi-ough a variety of physical, biological, and chemical treatment
processes, Ttiese facilities normally consist of a grass buffer
strip, sand bed, ponding area, organic layer or mulch layer,
planting soil, and plants. The runoffs velocity is reduced by
passing over or through buffer strip and subsequently distributed
evenly along a ponding area. Exfiltration of the stored water in
the bioreitention area planting soil into fhe underlying soils
occurs over a period of days,
Caiifomia Experience
None documented, Bioretention has been used as a stormwater
BMP since 1992. In addition to Prince George's Coun-t)', MD and
Alexandria, VA, .bioretention has been used successfully at urban
and suburban areas in Montgomeiy Count}', MD; Baltimore
County, MD; Chesterfield Count)', VA; Prince William County,
VA; Smitii Mountain Lake State Park, VA; and Cary, NC,
Advantages
B Bioretention pro\'ides stormwater ti'eatment tiiat enliances
the quality of do'ivnstiream water bodies by temporarily
storing nmoff in the BMP and releasing it over a period of
foiu- days to the recei-^dng water (EVA, 1999)-
m The vegetation pro^ddes shade and wind breaks, absorbs
noise, and improves an area's landscape.
Limitations
B Tlie bioretention BMP is not recommended for ai-eas witii
slopes greater than 20% or where mature ti'ee removal would
Targeted Constituents
0
EI
0
m
Ef
Sediment
Nutrients
Trasti
iVletals
Bacteria
Oil and Grease
Organics
i
I
I
B
I
8
Legend (Removal Effectiveness)
• Low • Higti
A (Vtedium
January 2003 California Stormv^ater BMP Handbook
New Development and Redevelopment
www. cal3tTipliandbool<s. com
1 of 8
FC-32 Bioretention
be required since clogging may res'ult, paiticulaily if the BMP receives nmoff mth higli
sediment loads (EPA, 1999).
I Bioretention is not a suitable BMP at locations where the water table is wfhin 6 feet of the
gi-oimd siuf ace and where the smrounding soil stratum is imstable.
> By design, bioretention BMPs have the potential to create very attractive habitats for
mosquitoes and other vectors because of highly organic, often hea\ily vegetated areas mixed
with shallow water.
I In cold cUmates tiie soil may freeze, preventing ninoft" from infiltrating into the planting soil.
Design and Sizing Guidelines
• The bioretention area should be sized to captiu-e fhe design storm rimoff.
• In areas where the native soil permeability is less than 0,5 in/hr an imderdrain shouldbe
provided.
• Recommended nunimum dimensions are 15 feet by 40 feet, altiiough the preferred width is
25 feet. Excavated deptii should be 4 feet.
• Ai-ea should drain completely within 72 hours.
• Approximately 1 tree or shrub per 50 ft^ of bioretention area should be included.
• Cover area with about 3 inches of mulch.
CoTisIruction/l7ispectio7i Considerations
Bioretention ai-ea should not be established until contributing watershed is stabilized.
Performance
Bioretention removes stormwater pollutants thro^ogh physical and biological processes,
mcluding adsorption, fitoation, plant uptake,.,micr.abial activity,..dec.QinpD.sition,..se.dimentation.....
aad volatilization (EPA, 1999). Adsorption is tiie process whereby particulate pollutants atiiach
to soil (e.g., clay) or vegetation surfaces. Adequate contact time betiveen the surface and
pollutant must be provided for in the design of tiie sj-stem for tills removal process to occiu".
Thus, tlie infiltration rate of tiie soils must not exceed those specified in the design critena or
pollutant removal may decrease. Pollutants removed by adsoiption include metals, phosphonis,
aiid hydrocarbons. Filtration occui's as runoff passes tiirough tiie bioretention area media, such
as die sand bed, ground cover, and planting soil.
Common particulates removed fi-om stormwater include particulate organic matiier,
phosphoms, md suspended solids. Biological processes tiiat occur in wetiiimds result in
pollutant uptake by plants and microorganisms in the soil. Plant grovrtli is sustained by tiie
uptake of nutrients from the soils, mth woody plants locking up tiiese nutrients tiirough tiie
seasons. Microbial activity wtiiin tiie soil also contiibutes to tiie removal of niti^ogen and
orgimic matter. Nitrogen is removed by iiitiifying and denitiiijing b acteria, while aerobic
bacteria are responsible for tiie decomposition of tlie organic maOier. Microbial processes
require ox}'gen and can result in depleted ox}'gen levels if the bioretention area is not adequately
7of8 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
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Bioretention TC-32
aerated. Sedimentation occiu's in the swale or ponding area as the velocity slows and solids fall
out of suspension.
The removal effectiveness of bioretention has been stiidied timing field and laboratoty stiidies
conducted by tiie University of Maryland (Davis et al, 1998), Dming these experiments,^
synthetic stormwater runoff was pumped tiirough several laboratoty' and field bioretention ai'eas
to simulate typical storm events in Prince George's Coimty, MD, Removal rates for hea^y metals
and nutiients are showi in Table 1.
Tablel Laboratory and Estimated
Bioretention Davis et al. (1998);
PGDER (1993)
Pollutant Removal Rate
Total Phosphorus 70-83%
Metals (Cu, Zn, Pb) 93-98%
TKN 68-80%
Total Suspended Solids 90%
Organics 90%
Bacteria 90%
Results for b otii the laboratoiy and field experiments were similar for each of the pollutants
cmalyzed. D oubling or halving the influent pollutant levels had Htile effect on the effluent
pollutants concentrations (Da^is et al, 1998),
The microbial activity and plant uptake occurring in the bioretention area will likely result in
higher removal rates than tiiose determined for infiltration BMPs,
Siting Criteria
Bioretention BMPs are generally used to treat stormwater from impervious surfaces at
commercial, residential, and industrial ai'eas (EPA, 1999)- Implementation of bioretention for
stormwater management is ideal for median stiips, pai'king lot islands, and swales. Moreover,
the nmoff m these areas can be designed to eitiier divert directiy into tihe bioretention area or
convey into the bioretention area by a cui'b and gutter collection system.
The best location for bioretention areas is upland from inlets tiiat receive sheet flow ft-om graded
ai-eas and at areas that ^vill be excavated (EPA, 1999)- In order to maximize ti-eatinent
effectiveness, the site must be gi-aded in such a way that minimizes erosive conditions as sheet
flow is conveyed to tiie ti-eatment area. Locations where a bioretention ai-ea can be readily
incoiporated into the site plan witiiout fiirtiier environmental damage are prefeired,
Fmthermore, to effectively minimize sediment loading in tiie ti-eatment area, bioretention only
slioidd be used in stabilized drainage areas.
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
www, cabmphandbooks. com
3 ofj
TC-32 Bioretention
Additional Design Guidelines
The layout of the bioretention ai'ea is determined after site constraints such as location of
utilities, imderljing soils, existing vegetation, and drainage are considered (EPA, 1999). Sites
wth loamy sand soils are especially appropriate for bioretention because tiie excavated soil can
be backfm'ed md used as the planting soil, tiius eliminating the cost of importing plmiting soil.
The use of bioretention may not be feasible given an imstable surrounding soil stiatiim, soils
widi clay content greater than 25 percent, a site with slopes greater tiian 20 percent, and/or a
site witii mature tiees tliat would be removed timing construction ofthe BMP,
Bioretention can be designed to be off-Hne or on-line of the existing drainage system (EPA,
1999). The drainage area for a bioretention ai-ea shoidd be betiveen 0.1 and 0.4 hectares (0.25
and 1.0 acres). Larger drainage areas may require multiple bioretention ai-eas. Furthermore,
tiie maximum drainage area for a bioretention area is determined by the expected rainfall
intensity and nmoff rate. Stabilized areas may erode when velocities are greater tiian 5 feet per
second (1,5 meter per second). The designer should determine tiie potential for erosive
conditions at the site.
The size of the bioretention area, which is a fimction of the drainage area and tiie runoff
generated from the ai-ea is sized to capture tiie water quahty volume.
The recommended mioimum dimensions of tiie bioretention ai-ea are 15 feet (4.6 meters) wide
by 40 feet (12.2 meters) long, where the minimum wdth allows enough space for a dense,
randomly-distributed area of trees and shrubs to become estabhshed. Thus rephcating a natiiral
forest and creating a microchmate, tiiereby enabling the bioretention area to tolerate die effects
of heat stiess, acid rain, runoff pollutants, and insect and disease infestations which landscaped
areas in m-ban settings typically are imable to tolerate. The preferred width is 25 feet (7,6
meters), mth a length of t^\ice the width. Essentially, any facilities v/ider than 20 feet (6.1
metersi'should be twice as long as tiiey are mde, wliich promotes tiie distiibution of flow and
decreases the chances of concentiated flow.
In order to provide adequate storage and prevent water from standing for excessive periods of
time the ponding depth of fhe bioretention area should not.exceed 6 mches (15 centimeters).
Water should not be left to stand for more tiian 72 hours, A restiiction on tiie type of plants tiiat
can be used may be necessarj' due to some plants' water intolerance, Fiuthermore, if water is
left standing for longer than 72 hours mosquitoes and otiier insects may start to breed.
The appropriate planting soil should be backfilled into tiie excavated bioretention ai-ea. Planting
soils should be sandy loam, loamy sand, or loam textiu-e mth a clay content ranging from 10 to
25 percent.
Generally the soil shoiddhave infilti-ation rates greater tiian 0.5 mches (1,25 centimeters) per
hour, wliich is typical of sandy loams, loamy smds, or loams. The pH of tiie soil should range
bebveen 5,5 and 6,5, where pollutants such as organic nitrogen and phosphonis can be adsorbed
by the soil and microbial activity can flourish. Additional reqmrements for fhe planting soil
indude a 1.5 to 3 percent organi,c content and a maximmn 500 ppm concenti'ation of soluble
saiis.
4Qf8 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
www.cabmphandbooks.com
Bioretention TC-32
Soil tests should be performed for eveiy 500 cubic yards (382 cubic meters) of planting soil,
Mth the exception of pH and organic content tests, which ai-e required only once per
bioretention area (EPA, 1999). Planting soil should be 4 inches (10.1 centimeters) deeper than
tiie bottom of fhe largest root ball and 4 feet (1.2 meters) altogetiier, Tliis depth wU pro\ide
adequate soil for fhe plants' root systems to become estabhshed, prevent plant damage due to
severe mnd, and provide adequate moistiu-e capacity. Most sites mil require excavation m
order to obtain the recommended depth.
Planting soil depths of gr-eater tiian 4 feet (1,2 meters) may reqiure additional construction
practices such as shoring measiures (EPA, 1999), Planting soil should be placed in 18 inches or
gi-eater lifts and Hglitiy compacted until the desired deptii is reached. Since high canopy tiees
may be destioyed during maintenance fhe bioretention area should be vegetated to resemble a
terrestrial forest community' ecosystem tiiatis dominated by imderstoiy trees. Three species
each of both trees and shmbs ai'e recommended to be planted at a rate of 2500 trees and shruts
per hectare (1000 per acre). For instance, a 15 foot (4.6 meter) by 40 foot (12.2 meter)
bioretention area (600 square feet or 55.75 square meters) would require 14 ti-ees and shrubs.
The shrub-to-tiee ratio shouldbe 2:1 to 3:1.
Trees and shrubs should be planted when conditions are favorable. Vegetation should be
watered at the end of each day for fourteen days following its planting. Plant species tolerant of
pollutant loads and varying wet and dty conditions should be used tn fhe bioretention area.
The designer should assess aesthetics, site layout, and maintenance requirements when
selecting plant species. Adjacent non-native invasive species should be identified and the
designer should take measures, such as providng a soil breach to ehminate the threat of these
species invading tiie bioretention area. Regional landscapmg manuals should be consulted to
ensure that the planting of the bioretention area meets tiie landscaping requii'ements
established by tiie local autiiorities. Tlie designers should evaluate fhe best placement of
vegetation within fhe bioretention area. Plants should be placed at iiregular intervals to
replicate a natural forest. Trees should be placed on tiie perimeter of the ai-ea to pro\ide shade
and shelter fi-om fhe wind. Trees and shrubs can be sheltered fi-om. damaging flows if they are
placed away from tiie path of the incoming runoff'. In cold climates, species fhat are more
tolerant to cold winds, such as evergreens, shoidd be placed in windier areas ofthe site.
FoUo^ving placement of tlie trees and shrubs, the ground cover and/or mulch should be
established. Ground cover such as grasses or legumes can be planted at tiie begmning of the
growng season. Mulch should be placed immediately after trees and shrubs are planted. Two
to 3 inches (5 to 7.6 cm) of commercially-available fine shredded hardwood mulch or sliredded
hai-dwood chips shoidd be apphed to the bioretention area to protect from erosion.
Maintenance
The primary mahitenance requirement for bioretention ai-eas is that of inspection and repair or
replacement of fhe treatment area's components. Generally, this involves nothing more tlian the
routine periodic maintenance tiiat is required of any landscaped area. Plants tiiat are
appropriate for tiie site, chmatic, and watering conditions shoidd be selected for use m tiie
bioretention cell. Appropriately selected plants wiU aide in reducing fertilizer, pesticide, water,
and overall maintenance requirements, Bioretention system components shoidd blend over
time through plant and root growth, organic decomposition, and tiie development of a natural
January 2003 California Stormwater BMP Handbook SofS
New Development and Redevelopment
www, cabmphandbooks.com
TC-32 Bioretention
soil horizon. These biologic and physical processes over time mil lengthen the facdity's hfe span
and reduce the need for extensive maintenance.
Routine maintenance shoidd include a biaimual health evaluation of fhe ti-ees and shrubs and
subsequent removal of any dead or diseased vegetation (EPA, 1999)- Diseased vegetation
should be ti-eated as needed using preventative and low-toxic measures to the extent possible,
BMPs have the potential to create vety attr-active habitats for mosquitoes and other vectors
because of highly organic, often hea-^ily vegetated ai-eas mixed mth shallow water. Routine
inspections for areas of stimding water -within the BMP and coirective measures to restore
proper infilti-ation rates are necessaiy to prevent creating mosquito and other vector habitat. In
addition, bioretention BMPs are susceptible to invasion by aggt-essive plant species such as
cattails, which increase the chances of water standing and subsequent vector production if not
routinely maintained.
In order to maintain the ti-eatment area's appeai-ance it may be necessary to prune and weed.
Furthermore, mulch replacement is suggested when erosion is evident or when the site begins to
look unattractive. Specifically tiie entire area may require mulch replacement eveiy two to
thi-ee years, although spot mulching may be sufficient when tiiere are random void areas. Mulch
replacement should be done prior to fhe start of fhe wet season..
New Jersey's Department of Environmental Protection states in tiieir bioretention systems
standards that accumulated sediment and debris removal (especially at the inflow point) will
normally be the primary mamtenance function. Otiier potential tasks hiclude replacement of
dead vegetation, sod pH regulation, erosion repair at inflow points, mulch replenishment,
unclogging the imderdrain, and repairing overflow stinictures. There is also tiie possibdity tiiat
the cation exchange capacity of tiie soils ui tiie cell will be significantiy reduced over time.
Depending on pollutant loads, soils may need to be replaced within 5-10 years of construction
(LID, 2000).
Cost
Construction Cost
Construction cost estimates for a bioretention ai-ea are slightiy greater tiian tiiose for tiie
required landscapmg for a new development (EPA, 1999). x^.general rule of tiiumb (Coffman,
1999) is tiiat residential bioretention areas average about $3 to $4 per squai-e foot, dependmg on
soil conditions and tiie density and types of plants used. Commercial, industiial and
institiitional site costs can range betiveen $10 to $40 per square foot, based on the need for
control stnictiires, curbing, storm drains andimderdrains,
Reti-ofitting a site typically costs more, averaghig $6,500 per bioretention area. The higher costs
ai-e attributed to the demohtion of existing concrete, asphalt, and existing stnictures and the
replacement of fill material witii planting soil, Tlie costs of reti-ofitting a commercial site in
Matyland, Kettering Development, mtii 15 bioretention areas were estimated at $111,600,
In my bioretention area design, tiie cost of plants varies substantially and can accoimt for a
significant portion of the expendtiu-es, WMe tiiese cost estimates are shghtiy greater than
tiiose of typical landscaping treatment (due to tiie increased number of plantings, additional sod
excavation, backfill material, use of underdrains etc), tiiose laiidscapuig expenses tiiat would be
reqiired regardless of the bioretention histallation should be subti-acted when deteriiuning fhe
net cost
5 ofS California Stormwater BMP Handbook January 2003
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Bioretention TC-32
Perhaps of most importance, however, the cost sa\dngs compared to the use of traditional
stnictiu-al stormwater conveyance systems makes bioretention areas quite attr-active financially.
For example, the use of bioretention can decrease fhe cost required for constructing stormwater
conveyance systems at a site. A medical office biilding in Mar}'land was able to reduce fhe
amount of storm drain pipe that was needed from 800 to 230 feet - a cost savings of $ 24,000
(PGDER, 1993). And a new residential development spent a total of approximately $100,000
using bioretention cells on each lot instead of nearly $400,000 for the traditional stormwater
ponds fhat were originally planned (Rappahanock,). Also, in residential areas, stormwater
management controls become a part of each propeity' owner's landscape, reducing the pubhc
bm-den to maintain large centrahzed facihties.
Maintenance Cost
The operation and maintenance costs for a bioretention facdity wdl be comparable to those of
tj'picai landscaping required for a site. Costs beyond the normal landscaping fees -wiU hiclude
tiie cost for testing the soils and may include costs for a sand bed and planting soil.
References and Sources of Additional Information
Coffman, L.S,, R, Goo andR. Frederick, 1999: Low impact development an innovative
altemative approach to stormwater management. Proceedings ofthe 26th Armual Water
Resources Planning and Management Conference ASCE, June 6-9, Tempe, Arizona.
Da\is, A,P,, Shokouhian, M., Sharma, H, and Minami, C, "Laboratory Study of Biological
Retention (Bioretention) for Urban Stormwater Management," Water Environ. Res., 73(i), 5-14
(2001),
Da\is, A.P., Shokoiddan, M., Sharma, H,, Minami, C, and Winogradoff, D, "Water Quality
Improvement through Bioretention: Lead, Copper, and Zinc," Water Environ. Res., acceptedfor
pubhcation, Aug-ust2002,
Kim, H,, Seagren, E.A., and Davis, A.P., "Enghieered Bioretention for Removal of Nitrate from
Stormwater Rimoff," WEFTEC2000 Conference Proceedings on CDROM Research
Symposium, Nitrogen Removal, Session 19, Anaheim CA, October 2000.
Hsieh, C.-h. and Davis, A P. "Enguieering Bioretention for Treatment of Urban Stormwater
Runoff," Watersheds 2002, Proceedings on CDROM Research Symposium, Session 15, Ft.
Lauderdale,.FL, Feb. 2002,
Piince George's Coimty Department of Environmental Resources (PGDER), 1993. Design
Manual for Use of Bioretention in Stormwater Management. Division of Emironmental
Management, Watershed Protection Branch. Landover, MD.
U.S. EPA Office of Water, 1999. Stormwater Technology Fact Sheet Bioretention. EPA832-F-
99-012,
Weinstein, N, Da\is, A.P. and Veeramachaneni, R. "Low Impact Development (LID) Stormwater
Management Approach for tiie Control of Diffuse Pollution from Urban Roadways," 5th
International Conference Diffuse/Nonpoint Pollutiion and Watershed Management
Proceedings, G.S. Melching and Emre Alp, Eds. 2001 International Water Association
January 2003 California Stormwater BMP Handbook 7 of 8
New Development and Redevelopment
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rc-32 Bioretention
CURB srops-
PARKING LOT SHEETFLOW
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PROFILE
Schematic of a Bioretention Facility (MDE, 2000)
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January 2003
Site Design & Landscape Pfanning SP-lQ_
Design Objectives
121 Maximize Infillralion
0 Provide Relenlion
0 SlowRunolf
Minimize Impervious Land EI Coverage
Prohibit Dumping of Improper
Malerials
Con lain Pollulanis
Collect and Convey
Description
Each project site possesses imique topographic, hydrologic, and vegetative feattires, some of
winch are more suitable for development tiian otiiers. Integrating and mcorporating
appropriate landscape planning metiiodologies mto tiie project design is tiie most effective
action tiiat can be done to minimize surface and groimdwater contamination from stormwater.
Approach
Landscape planniiig should couple consideration of land suitabihty tor urban uses mth
consideration of commimity goals and proj ected gro^-di, Proj ect plan desi^s should conseiTe
natural areas to tiie extent possible, mciximize natural water storage and mfilti-ation
opportunities, and protect slopes and channels.
Suitable Applications
Appropriate apphcations include residential, commercial and hidustiial areas planned for
development or redevelopment.
Design Considerations
Design requirements for site design md landscapes planning
should conform to apphcable standai-ds and specifications of
agencies wtii juiisdiction and be consistent witii apphcable
General Phm and Local At-ea Plan policies.
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SP-10 Site Design & Landscape Planning
Design big New In s talla tions
Begin the development of a plan for tiie landscape unit -with attention to tiie following general
piiticiples:
a Formulate the plan on the basis of clearly articulated commimity' goals. Carefully identify'
conflicts and choices betiveen retaining and protecting desired resources and community
gi'owth.
• Map and assess land suitabihty for urban uses. Include the foUowing landscape features m
the assessment: wooded land, open unwooded land, steep slopes, erosion-prone soils,
foimdation suitabihty, sod smtabihty for waste disposal, aquifers, aquifer recharge areas,
wetiands, floodplains, surface waters, agricultirral lands, and various categories of urban
land use. When appropriate, the assessment can highhght outstanding local or regional
resom-ces that the community determines should be protected (e.g., a scenic area,
recreational area, threatened species habitat, farmland, fish run). Mapping and assessment
should recognize not only these resources but also addtional areas needed for tiiefr
sustenance.
Project plan designs shoidd conserve natural areas to the extent possible, maximize nataral
water storage and infdtiation opportimities, and protect slopes and channels.
Conserve Natural Areas during Landscape Planning
If applicable, tiie following items are required and must be implemented hi die site layout
dniing tiie subdivision design and approval process, consistent with apphcable General Plan and
Local Area Plan pohcies:
• Cluster development on least-sensitive portions of a site whde leaving the remairung land m
a natural undisturbed condition.
a Limit clear-ing and grading of native vegetation at a site to the mhiimum amount needed to
build lots, allow access, and pro-vide fire protection.
• Maximize tiees and otiier vegetation at each site by pl anting additional vegetation, clustering
tree areas, and promoting the use of native and/or drought tolerant plants.
a Promote natui-al vegetation by using parking lot islands and other landscaped areas.
• Preserve riparian areas and wetiands.
Maximize Natural Water Storage and Infiltration Opportunities Within the Landscape Unit
m Promote the conservation of forest cover. Biildng on land that is already deforested affects
basin h3'drology to a lesser extent than converting forested land. Loss of forest cover reduces
interception storage, detention in the organic forest floor layer, and water losses by
evapotranspiration, residting in large peak nmoff increases and either tiieir negative effects
or tfie expense of coimtering them vdtii stmctural solutions.
s Maintain natiu-al storage resei-vofrs and drainage conidors, including depressions, areas of
permeable sods, swales, and hitermittent streams. Develop and implement pohcies and
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Site Design & Landscape Planning SD-lQ
regidations to discourage the clearing, fiUing, and channehzation of these features. Utilize
them in drainage netivorks in preference to pipes, culverts, and engmeered ditches.
s Evaluating infUtration opportunities by refen-ing to the stormwater management manual for
the jmisdction and pay particular attention to fhe selection criteria for avoidng
groimdwater contamination, poor soils, and hydi-ogeological condi.tions diat cause these
facihties to fad. If necessary, locate developments witii lai-ge amoimts of impenious
smfaces or a potential to produce relatively contaminated runoff away fi-om groimdwater
recharge ar-eas.
Protection of Slopes and Channels during Landscape Design
• Convey nmoff safely fi-om the tops of slopes,
• Avoid distiirbing steep or imstable slopes.
• Avoid disturbing natural channels.
B Stabihze distui-bed slopes as qmckly as possible.
B Vegetate slopes -wifh native or drought tolerant vegetation.
B Control and treat flows in landscaping and/or other controls prior to reaching existing
natural drainage systems.
• Stabihze temporary and permanent channel crossings as quickly as possible, and ensure that
increases in run-off velocity and frequency caused by the project do not erode fhe channel.
• Install energy dissipaters, such as riprap, at the outiets of new storm drahis, culverts,
conduits, or channels that enter imhned channels in accordance •with applicable
specifications to minimize erosion. Energy dssipaters shaU be installed in such a way as to
mirdmizeimpacts to recei-ving waters.
m Line on-site conveyance channels where appropriate, to reduce-erosioncaused by increased
flow velodty due to increases in tributary impervious area. The first choice for hnings
should begrass or some other vegetative surface, since these materials not only reduce
nmoff velocities, but also provide water quality benefits from fUtration and infiltration. If
velocities in the channel are high enough to ei'ode grass or other vegetative linings, riprap,
concrete, soil cement, or geo-grid stabiUzation are ofher altematives.
• Consider other design principles that are comparable and equally effective.
Redeveloping Existing Installations
Various jmisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amoimts of additional impenious ai-ea, increases in gi-oss
floor ai-ea and/or exterior constiuction, and land distiu'bing activities with stnicUiral or
impenious siufaces. The definition of" redevelopment" must be consulted to determine
whether or not the reqmrements for new development apply to ai-eas intended for
redevelopment. If the definition appKes, tiie steps outiined imder "designing new installations"
above should be foUowed,
January 2003 California Stormwater BMP Handbook 3 of 4
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SD-10 Site Design & Landscape Planning
Redevelopment may present significant opportmUty to add features wliich had not previously
been implemented. Examples include incorporation of depressions, areas of permeable soils,
and swales in newly redeveloped areas. WhUe some site constiaints may exist due to the statiis
of already existing infrastructure, opportimities should not be missed to maximize infiltration,
slow nmoff, reduce impenious areas, disconnect drectiy connected impei-vious ai-eas.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Deparbnent of Pubhc Works, May 2002.
Stormwater Management Manual for Westem Washington, Washhigton State Department of
Ecology August 2001.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
Sail Diego, and Cities in San Diego Coimty, Febniarj' 14, 2002.
Model Water Quality' Management Plan (WQMP) for County of Orange, Orange Coimty Flood
Contiol District, and the Incorporated Cities of Orange Coimty, Draft Febniaty 2003.
V'entiara Countj'^^ideTechmical Guidance Manual for Stormwater Quahty Control Measures,
July 2002,
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[oof Runoff Controls
MasiiTiiza liiiiiiranoii
F'roi/ide Reieniion
oluv Riino'ii
Minimize iiriperviou^ i,.aiici
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F'i'olii'jii T'l irnpinCi oi liVipro;;
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Description
Various roof runoff controls are available to address stormwater
that drains off rooftops. The objective is to reduce the total volume -arid r;
individual lots, and retain the pollutants on site that may be picked up trc
and atmospheric deposition. Roof runoff controls consist of directing the
paved areas and mitigating flow to the storni drain system through one ot
approaches: cisterns or rain barrels; dry wells or inflltration trenches; pop-up emitters, and
foundation planting. The first three approaches require the roof runoff to l3e contained in a
gutter and downspout system. Foundation planting provides a vegetated strip under the drip
line of the roof.
Approach
Design of individual lots for single-family homes as well as lots for higher density residential a;:
commercial structures should consider site design provisions for containing and infiltrating roc
runoff or directing roof runoff to vegetative swales or buffer areas. itetaiiiCu wai-ci Caa ut reast
fbr watering gardens, lawns, and trees. Benefits to the environment inciude ledaced uemand t:
potable water used for irrigation, improved stormwater quality, increased groundwater
recharge, decreased runoff volume and peak flows, and decreased fiooding potential.
Suitable Applications
Appropriate .applications include residential, commercial and industnai areas pianned tor
development or redevelopment,
Design Considerations
Desigrdng New Installations
Cisterns or Rain Barrels
One method of addressing roof runoff is to direct roof downspouts
to cisterns or rain barrels. A cistern is an above ground storage
vessel with either a manually operated valve or a permanently open ^0^^'^^'^^
•outlet. Roof runoff is temporarily stored and then released for
irrigation or infiltration between storms. The number of rain ' 'li|- /7iiw»5,f*Hr
January 2003 California Stormwater BIMP Handboo!--.
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SD-11 Roof Runoff Controls
barrels needed is a function of the rooftop area. Some low impact developers recommend that
every house have at least 2 rain barrels, with a minimum storage capacity of looo hters. Roof
barrels sei-ve several purposes including mitigating the first flush from the roof which has a high
rolume, amount of contaminants, and thermal load. Several types of rain barrels are
commercially available. Consideration must be given to selecting rain barrels that are vector
proof and childproof. In addition, some barrels are designed -with a bypass valve that filters out
grit and other contaminants and routes overflow to a soak-away pit or rain garden.
Ifthe cistem has an operable valve, the valve can be closed to store stormwater for irrigation or
infiltration between storms. This system requires continual monitoring by the resident or
irounds crews, but provides greater flexibility in water storage and metering. If a cistern is
jrorided mth an operable valve and water is stored inside for long periods, the cistern must be
covered to prevent mosquitoes from breeding.
A cistern system -with a permanently open outlet can also provide for metering stormwater
luiioff. If the cistern outlet is significantly smaller than the size of the downspout inlet (say V4 to
inch diameter), runoff will build up inside the cistern during storms, and -will empty out
slowly after peak intensities subside. This is a feasible way to mitigate the peak flo-w increases
aiised by rooftop impervious land coverage, especially for the frequent, small storms.
Dry wells and Infiltration Trenches
Roof downspouts can be directed to dry wells or infiltration trenches. A dry well is constructed
hj excavating a hole in the ground and filhng it with an open graded aggregate, and allowing the
water to fiU the dry weh and infiltrate after the storm event. An underground connection from
the downspout conveys water into the dty well, allowing it to be stored in the voids. To
minimize sedimentation from lateral sod movement, the sides and top ofthe stone storage
matrix can be -wrapped in a permeable filter fabric, though the bottom may remain open. A
perforated observation pipe can be inserted vertically into the diy well to aUow for inspection
and maintenance.
In practice, dry wells recei^ving runoff from single roof downspouts have been successful over
long periods because they contain vei-y little sediment. They must be sized according to the
amount of rooftop runoff received, but are typically 4 to .5 feet square, and 2 to 3 feet deep, with
a minimum of i-foot sod cover over the top (maximum depth of 10 feet).
Toprotect.the foundation, dry weUs must be set away from the building at least 10 feet. They
must be installed in solids that accommodate infiltration. In poorly drained soils, dry wehs have
vei-y limited feasibdity.
Infiltration trenches function in a similar manner and would be particularly effective for larger
roof areas. An infiltration trench is a long, narrow, rock-filled trench -with no outlet that receives
stonnwater runoff These are described under Treatment Controls.
Pop-up Drainage Emitter
Roof downspouts can be directed to an underground pipe that daylights some distance from the
building foundation, releasing the roof runoff through a pop-up emitter. Similar to a pop-up
irrigation head, the emitter only opens when there is flow from the roof The emitter remains
flush to the ground during dry periods, for ease of la-wn or landscape maintenance.
2 of 3 California Stormwater BMP Handbook January 2003
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I
I
Roof Runoff Controls SIP-':
Foundation Planting
Landscape planting can be pro-vided around the base io allow inci-eased opportunities for
stormwater infiltration and protect the sod from erosion caused by concentrated sheet flow-
coming off the roof Foundation plantings can reduce the ph3'sical impact of water on the soil
and provide a subsurface matrix of roots that encourage infiltration. These plantings must be
sturdy enough to tolerate the heavy runoff sheet flows, and periodic soil saturation,
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impenious area, increases in gross
floor area and/or exterior construction, and land disturbing activities v\ith structural or
impervious surfaces. The definition of" redevelopment" must be consulted to determine
whether or not the requirements for new development apply to areas intended for
redevelopment. Ifthe definition applies, the steps outiined under "designing new installations"
above should be followed.
Supplemental Information
Examples
a City of Ottawa's Water Links Surface -Water Quality Protection Program
s City of Toronto Downspout Disconnection Program
a City of Boston, MA, Rain Barrel Demonstration Program
Other Resources
Hager, Marty Catherine, Stormwater, "Low-Impact Development", January/February 2003.
www.stormh2o,com
Low Impact Urban Design Tools, Low Impact Development Design Center, Belts-Nille, MD.
wvyw.lid-stormwater.net
Start atthe Source,_BayAi-ea Stormwater Management Agencies Association, 1999 Edition
January 2003 California Stormwater BMP Handbook
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Efficient Irrigation SD-12
^^^^^^^^^^^^^^^
Design Objectives
0 Maximize Infillration
121 Provide Retenlion
0 Slov Runoff
Minimize Impervious Land
Coverage
Proliibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Imgation water provided to landscaped areas may result hi excess irrigation water being
conveyed into stormwater drainage systems.
Approach
Project plan designs for development and redevelopment should include apphcation metiiods of
irrigation water that minimize nmoff of excess irrigation water into tiie stormwater conveyance
STOtem.
Suitable Applications
Appropriate apphcations include residential, commercial and uidustiial areas planned for
development or redevelopment. (Detiiched residential single-family homes are typically
excluded from this requirement.)
Design Considerations
Designing Neiv Installations
The following methods to reduce excessive inigation nmoff should be considered, and
incorporated and implemented where determined apphcable and feasible by the Permittee:
B Employ rain-triggered shutoff devices to prevent inigation after precipitation.
• Design irrigation systems to each landscape area's specific water reqiui-ements.
a Include design featmiiig flow reducers or shutoff valves
triggered by a pressure drop to conti-ol water loss hi tiie event
of broken sprinkler heads or hnes.
a Implement landscape plans consistent mth County or City
water consen'ation resolutions, winch may include provision
of water sensors, progr-ammable h-rigation times (for short
cycles), etc.
January 2003 California Stormwater BMP Handbook
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1 0(2
SD-12 Efficient Irrigation
H Design timing and application methods of imgation water to minimize the runoff of excess
imgation water into the storm water drainage system.
B Group plants vrifh similar water requirements hi order to reduce excess irrigation nmoff and
promote surface filttation. Choose plants -svifh low urigation reqiurements (for example,
native or drought tolerant species). Consider design featin-es such as:
- Using mulches (such as wood chips or bar) in planter areas wtiiout gi-ound cover to
minimize sediment in nmoff
- Instahing appropriate plant materials for fhe location, hi accordance wth amount of
sunlight and chmate, and use native plant materials where possible and/or as
recommended by the landscape architect
- Leaving a vegetative barrier along the property boimdaiy and interior watercourses, to
act as a pollutant filter, where appropriate and feasible
- Choosing plants that minimize or ehmhiate fhe use of fertihzer or pesticides to sustain
gro^vth
1 Employ other comparable, equally effective metiiods to reduce h-rigation water runoff.
Redeveloping Existhig Installations
Yarious jurisdictional stormwater management and mitigation plans (SUSMP, WQ MP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, hicreases in gross
floor area and/or exterior constimction, and land dstmbing activities witii structural or
impervious smfaces. The definition of" redevelopment" must be consrdted to determme
v,hedier or not fhe requirements for new development apply to areas intended for
redevelopment, ff the definition apphes, tiie steps outimed ™der "desigrdng new uistallations"
above should b e followed.
Other Resources
A Manual for tiie Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Department of Pubhc Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities m San Diego County, Februaty' 14, 2002.
Model Water Quality Management Plan (WQMP) for Coimty' of Orange, Orange Coimty Flood
Conti-ol Distiict, and the Incoiporated Cities of Orange County, Draft Febmar}' 2003.
Ventiii-a Colmt)'^vide Teclmical Guidance Manual for Stormwater Quahty Conttol Measm-es,
July 2002.
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storm Drain Signage SD-13
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Ivlinimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollulanis
Collect and Convey
0
Description
Waste materials dmnped into storm drain inlets can have severe impacts on receiving and
ground waters. Posting notices regarding dscharge prohibitions at storni drain inlets can
prevent waste dmnping. Storm drahi signs and stencils ai-e highly visible somce conttols tiiat
are typically placed drectiy adjacent to storm drahi iidets.
Approach
The stencil or affixed sign contams a brief statement tiiat prohibits dumpmg of improper
materials into tiie urban runoff conveyance system. Storm drain messages have become a
populiu- metiiod of alerting tide public about tiie effects of and tiie prohibitions agamst waste
uISpOSSl.
Suitable Applications
Stencils and signs alert tiie pubhc to tiie destination of pollutants dscharged to the storm drain.
Signs are appropriate hi residential, commercial, and industiial areas, as weU as any other area
where contributions or dumpmg to storm drams is hkely.
Design Considerations
Storm dn-ain message markers or placards ai-e recom.mended at all storm drain inlets witiim tlie
boimdary of a development project. The marker should be placed in clear sight fachig toward
anyone approaching tiie inlet from eitiier side. All storm drain inlet locations should be
identified on the development site map.
Designing iVeiu Installations
Tlie following methods shoidd be considered for inclusion ui tiie
project design and show on proj ect plans:
s Provide stencihng or labelhig of all storm di-ain indets and
catch basms, constiucted or modified, within fhe project area
m± prolubitive language. Examples inciude "NO DUMPING
January 2003 California Stormwater BMP Handbook
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1 of2
SD-13 Storm Drain Signage
- DRAINS TO OCEAN" and/or ofher graphical icons to discourage iUegal dumping.
a Post signs wifh prohibitive language and/or graphical icons, which prohibit iUegal dmnping
at public access points along channels and creeks wthin the project area.
Note - Some local agencies have approved specific signage and/or storm d-ain message placards
for use. Consult local agency stormwater staff to determine specific requirements for placard
ypes and methods of apphcation,
R.edevelopmg Existhig Installations
Paiious jmisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, increases in gi-oss
loor area and/or exterior constraction, and land dstmbing acti-\ities with structural or
impervious surfaces. Iftiie project meets the definition of "redevelopment", tiien the
requirements statedunder " designing new installations" above should be mcluded in all project
design plans,
A,dditional Information
Mahitenance Considerations
I LegibUity of markers and signs should be maintained. If required by the agency with
jurisdiction over the project, the o-wner/operator or homeo^vner's association should enter
into a maintenance agreement wifh the agency or record a deed restriction upon the
propeity titie to maintain the legibdity of placards or signs.
Macemen t
a Signage on top of cmbs tends to weather and fade.
a Signage on face of cmbs tends to be worn by conbict witii vehicle tires and sweeper broom-s.
Supplemental Information
Examples
m Most MS4 programs have storm drain signage programs.-.Some MS4.prxigrams-TOU.provide_.
stencds, or arrange for volunteers to stencil storm drahis as part of fheh- outteach program.
Other Resources
AManual for the Standard Urban Stormwater Mfitigation Plan (SUSMP), Los Angeles Coimty
Department of Pubhc Works, Mlay 2002.
Model Standard Urban Storm Water Miitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities hi San Diego County, February 14, 2002.
Model Water Quality' Management Plan (WQMP) for Coimty' of Orange, Orange Coimty Flood
Conttol Distiict, and the Incoiporated Cities of Orange County, Draft Febniaty' 2003,
Ventm-a ComilysvideTeclmical Guidance Manual for Stormwater Quahty Conti'ol Measm-es,
July 2002,
2 of 2 California stormwater BMP Handbook January 2003
New Development and Redevelopment
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Road and Street Maintenance SC-70
Description
Streets, roads, and highways are significant somces of poUutants
in stormwater discharges, and operation and maintenance
(O&M) practices, if not conducted properly, can contribute to the
problem, Stormwater pollution from roadway and bridge
maintenance should be addressed on a site-specific basis. Use of
tiie procedm-es outhned below, that address sti-eet sweepmg and
repair, bridge and strucu.u-e maintenance, and impaved roads
mil reduce poUutants in stormwater.
Approach
Pollution Prevention
• Use the least toxic materials avaUable (e.g. water based
paints, gels or sprays for gi-affiti removal)
B Recycle paint and o tiier materials whenever possible.
e Enhst the help of citizens to keep yai-d waste, used oil, and
other wastes out of fhe gutter.
Suggested Protocols
Street Sweeping and Cleaning
B Maintain a consistent sweeping schedule. Provide minimum
monthly sv/eeping of cm-bed sti-eets.
B Perform str-eet cleaning dming dy v/eatiier if possible.
Objectives
• Cover
• Contain
• Educate
• Reduce/Minimize
• Product Substitution
Targeted Constituents
Sediment 0
Nutrients
Trasti 0
Metals 0
Bacteria
Oil and Grease 0
Organics 0
Oxygen Demanding 0
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SC-70 Road and Street Maintenance
a Avoid wet cleaning or flushing of street, and utihze diy methods where possible,
8 Consider increasing sweeping frequency based on factors such as ttaffic vohune, land use,
field obseivations of sediment and trash accumulation, proximity to water comses, etc. For
example:
Increase tiie sweeping frequency for sti-eets with high poUutant loadings, especially m
high ttaffic and industiial areas.
Increase fhe sweepmg fi-equency just before the wet season to remove sedmeiits
accumulated during the simimer.
Increase the sweeping fi-equency for stteets in special problem areas such as special
events, high htter or erosion zones.
I Maintain cleaning equipment in good working condtion and pmchase replacement
equipment as needed. Old sweepers should be replaced with new technologicaUy advanced
sweepers (preferably regenerative ah- sweepers) that maximize pollutant removal,
I Operate sweepers at manufactmer requested optimal speed levels to increase effectiveness.
« To increase sweeping effectiveness consider fhe foUo^ving:
- Instittite a parking policy to restrict pai-king in problematic areas during periods of stteet
sweeping.
Post permanent stt'eet sweeping signs in problematic areas; use temporary signs if
installation of permanent signs is not possible.
- Develop and distribute flyers notifying residents of stteet sweeping schedules.
B Regular-ly inspect vehicles and equipm.ent for leaks, and repah' immediately.
a If available use vacuum or regenerative air sweepers in the high sedinrent and trash areas
(tjpicahy industrial/commercial).
a Keep accmate logs of the number of cm-b-mUes swept and the amount of waste coUected.
a Dispose of stteet sweeping debris and dirt at a landfill.
a Do not store swept material along the side of the stteet or near a storm drain inlet.
• Keep debris storage to a minimum dining the wet season or make sme debris piles are
contamed (e.g. by berming the ar-ea) or covered (e.g. with tarps or permanent covers).
Sti^eet Repair and Maintenance
Pavement marking
B Schedide pavement marking activities for dry weather.
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Road and Street Maintenance SC-7Q
B Develop paint handing procedures for proper use, storage, and dsposal of paints.
B Transfer and load pakrt and hot tiiermoplastic away from storm drain inlets.
H Pro\ide drop cloths and drip pans hi pahit mixing areas.
H Properly maintain apphcation equipment.
a Sfreet sweep tiiermoplastic grindngs. Yellow tiiermoplastic grindiigs may requfre special
handling as they may contain lead.
a Pahits containing lead or tributyltin are considered a hazardous waste and must be disposed
of properly.
• Use water based paints whenever possible. If using water b ased paints, clean tiie application
eqmpment m a sink that is connected to the sanitaty sewer.
1 Properly store leftover pahits if tiiey are to be kept for tiie next job, or dspose of properly.
Concrete installation and repair
I Schedule asphalt and concrete activities for dry weather.
I Take measures to protect any nearby storm dram inlets and adj acent watercomses, prior to
breakmg up asphalt or concrete (e.g. place san bags around inlets or work areas).
I limit die amount of fresh concrete or cement mortar mixed, mix only what is needed for die
job.
Store concrete materials under cover, away from drainage areas, Secme bags of cement after
they are open. Be sme to keep whid-blown cement powder away from stteets, gutters, stonn
drahis, rainfall, and nmoff,
Retmn leftover materials to the ttaiisit mhcer Dispose of small amounts of-hardened excess
concrete, grout, and mortar hi the ttash.
Do not wash sweepmgs from exposed aggregate concrete hito fhe stteet or storm drain,
CoUect and rettum sweepings to aggregate base stockpUe, or dspose hi die ttash.
When maidng saw cuts in pavement, use as httie water as possible and perform dming dy
weather. Cover each storm drahi inlet completely witii filter fabric or plastic during die
sa^vmg operation and contahi tiie slmiy by placing sttaw bales, sandbags, or gravel dams
ai-oimd the inlets. After the hqmd drains or evaporates, shovel or vacuum the slurty' residue
from fhe pavement or gutter and remove from site, Altematively, a smaU onsite vacuum
may be used to pick up tiie sluny as tiis mU prohibit sluny from reachhig storm drain
inlets.
Wash concrete tincks off site or in designated ar-eas on site designed to preclude dscharge of
wash water to d-ainage system.
January 2003 California Stormwater BMP Handbook 3 ofQ
Municipal
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SC-70 Road and Street Maintenance
Patching, t^esurfacing, and surface sealing
a Schedule patching, resmfacing and smface seahng for dy weather.
B Stockpile materials away from streets, gutter areas, storm drain inlets or watercourses,
During wet weather, cover stockpUes vrifh plastic tarps or berm around fhem if necessaty' to
prevent ttansport of materials hi nmoff
a Pre-heat, ttansfer or load hot bituminous material away from drainage systems or
watercomses,
a Where apphcable, cover and seal nearby storm drain inlets (wifh wateiproof material or
mesh) and mahitenance holes before applying seal coat, sluny seal, etc. Leave covers in
place imtil job is complete and mtil all water from emulsified oU sealants has drained or
evaporated. Clean any debris from covered mahitenance holes and storm d-ain inlets when
the j ob is complete,
I Prevent excess material from exposed aggregate concrete or simUar tteatments from
entering sti-eets or storm drain inlets. Designate an area for clean up and proper disposal of
excess materials.
I Use only as much water as necessary for dust conttol, to avoid runoff,
I Sweep, never hose down stteets to clean up ttacked dht. Use a stteet sweeper or vacuum
truck. Do not dump vacuumed hquid in storm drains.
s Catch drips from paving equipment that is not in use with pans or absorbent material placed
under the machines. Dispose of coUected material and absorbents properly.
Eqmpment cleaning maintenance and storage
1 Inspect equipment daily and repafr any leaks. Place drip pans or absorbent materials under
heavy eqiupment when not in use^
a Perform maj or equipment repafrs at the coiporation yard, when practical,
• If refuehng or repairing vehicles and eqmpment must be done onsite, use a location away
from storm drain inlets and watercom-ses,
a Clean equipment includng sprayers, sprayer paint supply Ihies, patch and paving
equipment, and mud jackhig eqmpment at the end of each day. Clean in a shik or other area
(e.g. vehicle wash ai-ea) tiiat is connected to the sanitary sewer.
Bridge and Structure Maintenance
Paint and Paint Removal
m Transpoit paint and materials to and from j ob sites hi containers with secme hds and tied
dowi to the tt-ansport vehicle.
• Do not ttansfer or load pahit near- storm d'ahi hdets or watercomses.
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Road and Street Maintenance SC-70
H Test and inspect spray equipment prior to starting to pahit. Tighten all hoses and
connections and do not overfiU paint container,
a Plug nearby storm drain inlets prior to stai-ting painting where there is significant risk of a
spiU reaching storm d-ains. Remove plugs when job is completed.
a If sand blasting is used to remove paint, cover nearby storm drain inlets prior to starting
work.
I Perform work on a maintenance ttavel er or platform, or use suspended netting or tarps to
captiue paint, mst, paint removing agents, or other materials, to prevent discharge of
materials to siuface waters if the bridge crosses a watercomse. If sanding, use a sander with
a vacuum filter bag.
Capttn-e aU clean-up water, and dispose of properly.
Recycle pahit when possible (e.g, paint may be used for graffiti removal activities). Dispose
of imused paint at an appropriate household hazardous waste facUity.
Graffiti Removal
Schedule graffiti removal acti-vities for dry weather.
Protect nearby storm drain inlets prior to removing graffiti from waUs, signs, sidewalks, or
other stmcttures neechng graffiti abatement. Clean up aftenvards by sweeping or vacuuming
thoroughly, and/or by using absorbent and properly dsposhig of tiie absorbent.
When graffiti is removed by painting over, implement the procedmes under Painting and
Paint Removal above.
Direct runoff from sand blasting and high pressure washing (with no cleaning agents) into a
landscaped or dirt area. If such an area is not avaUable, fiher runoff tiirough an appropriate
filtering device (e.g. filter fabric) to keep sand, paiticles, and debris out of storm drains.
If a graffiti abatement metiiod generates wash water contairhng a cleaning compound (such
as liigh pressme washing -ivifh a cleaning compoimd), plug nearby storm d-ains and
vacuum/pump wash water to the sanitaty' sewer.
Consider ushig a waterless and non-toxic chemical cleanmg method for graffiti removal (e.g.
gels or spray compoimds).
Repair Work
Prevent concrete, steel, wood, metal parts, tools, or otiier work materials fi'om entering
storm d'ains or watercom-ses.
Thoroughly clean up tiie job site when the repah- work is completed.
When cleaning guardrails or fences foUow the appropriate surface cleaiung methods
(dependng on fhe type of smface) outhned in SC-71 Plaza & Sidewalk Cleaning fact sheet.
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SC-70 Road and Street Maintenance
• If painting is conducted, follow the painting and paint removal procedures above.
B If graffiti removal is conducted, foUow fhe graffiti removal procedmes above.
« If consttTiction takes place, see the Constmction Activity BMIP Handbook.
a Recycle materials whenever possible.
Unpaved Roads and Traik
a Stabihze exposed soU areas to prevent soU from eroding during rain events. This is
particidarly important on steep slopes.
a For roadside areas mth exposed soils, the most cost-effective choice is to vegetate the area,
preferably with a mulch or bhider that iviU hold fhe soils in place whUe the vegetation is
establishing. Native vegetation should be used if possible,
a If vegetation cannot be estabhshed immediately, apply temporary erosion control
mats/blankets; a comma sttaw, or gravel as appropriate,
• If sediment is already eroded and mobihzed in roadside areas, temporary' conttols should be
instaUed. These may include: sediment conttol fences, fabric-covered triangular-'dikes,
gravel-fUled bm-lap bags, biobags, or hay bales staked in place,
Non-Stormwater Discharges
Field crews should be aware of non-stormwater dscharges as part of theh: ongoing stteet
maintenance efforts,
I Refer to SC-io Non-Stormwater Disdiarges
• Identify' location, time and estimated quantity of discharges.
i Notify'appropriate personnel. - - -
Trahiing
• Train employees regarding proper stteet sweeping operation and stt'eet repair and
maintenance,
a Insttiict employees and sub conttactors to ensme that measm:es to reduce tiie stonnwater
impacts of roadway/bridge maintenance are being followed,
a Require engineering staff and/or considting A/E firms to address stormwater quahty in new
bridge designs or existing bridge rettofits.
a Use a ti-aining log or simUar method to document ttaining.
• Train employees on proper spiU containment and clean up, and in identif jing non-
stormwater discharges.
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Road and Street Maintenance SC-70
Spill Response andPreven tion
a Refer to SC-ii, SpUl Prevention, Conttol & Cleanup,
B Keep yoiu- SpiU Prevention Conttol and coimtermeasme (SPCC) plan up-to-date, and
implement accordingly,
a Have spUl cleanup materials readUy available and in a knowi location,
a Cleanup spUls immedately and use drj' metiiods if possible.
• Properly dispose of spiU cleanup material,
Other Considerations
a Densely populated ai-eas or heavily used streets may require parking regulations to clear-
stteets for cleaning.
a No cun-entiy available conventional sweeper is effective at remo-ving oU and grease.
Mechanical sweepers are not effective at remo-ving finer sediments,
a Limitations may arise in fhe location of new bridges. The avaUabihty and cost of land and
other economic and political factors may dictate where the placement of a new bridge wUl
occur. Better design of fhe bridge to conttol nmoff is required if it is being placed near
sensitive waters.
Requirements
Costs
a The mahitenance of local roads and bridges is already a consideration of most community
pubhc works or ti-ansportation departments. Therefore, the cost of poUutant reducing
management practices wUl involve the ttaining and eqmpment required to implement these
new practices.
a The largest expendittires for stteet sweeping progr-ams are in staffing and equipment. The
capital cost for a conventional stteet sweeper is between $6o,oOo and $120,000. Newer
technologies might have prices approaching $180,000. The average useful Iffe of a
conventional sweeper is about fom years, and programs must budget for equipment
replacement. Sweeping frequencies mH determine eqmpment hfe, so programs that sweep
more often should expect to have a higher cost of replacement
a A street sweeping program may require the f ollowng.
Sweeper operators, maintenance, supervisor)', and administtative personnel are
reqiired
- Traffic conttol officers may be required to enforce parking restrictions,
Skillful design of cleaning routes is required for program to be productive,
- Airangements must be made for dsposal of coUected wastes.
January 2003 California Stormwater BMP Handbook 7 of 5
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SC-70 Road and Street Maintenance
I If investing in newer technologies, tt-aining for operators must be included in operation and
mahitenance budgets. Costs for pubhc education ai-e small, and mostiy deal witli the need to
obey parking restrictions and litter conttol. Parking tickets are an effective reminder to obey
par-king rules, as weU as being a som-ce of revenue.
Mahitenajice
I Not apphcable
Supplemental Information
Further Detail ofthe BMP
treet sweeping
There aie advantages and disadvantages to the rivo common types of sweepers. The best choice
depends on your specific condtions. Many communities find itusefid to have a comphment of
bth types in their fleet
Mechanical Broom Sweepers - MIore effective at picking up large debris and cleaning wet stteets.
less costiy to purchase and operate. Create more airbome dust
'vicumu Sweepers - More effective at removing fine particles and associated heavy metals,
. heffective at cleaning wet stteets. Noisier than mechanical broom sweepers which may restrict
aieas or times of operation. May reqmre an advance vehicle to remove large debris.
Street Flushers - Not affected by biggest interference to cleaning, parked cars. May remove finer
sdiments, movhig fhem toward tiie gutter and stormwater inlets. For tins reason, flushing f eU
Gilt of favor and is now used primarily after sweephig. Flushing may be effective for combined
sewer systems, Presentiy stteet flushing is not allowed under most NPDES permits,
Qoss-Media Transfer of Pollutants
He Cahfomia Am Resources Board (ARB) has estabhshed state ambient air quahty standards
includng a standard for respfrable particiUate matter (less than or equal to lo microns in
dameter, symbohzed as PMio), In tiie effort to sweep up finer sediments to remove attached
hfavy metals, municipahties should be aware thatfhie dust, tiiat cannotbe capttued by tiie
s\!eeping equipment and becomes airbome, could lead to issues of worker and public safety.
Bridges
Bridges fhat carry vehicular ti-aSic generate some of tiie more drect discharges of runoff to
sntface waters. Bridge scupper drains cause a drect dscharge of stormwater mto receiving
waters and have been shown to earty' relatively high concenttations of pollutants. Bridge
mamtenance also generates wastes that maybe either drectiy deposited to the water below or
carried to the receivhig water by stormwater. The foUo^vhig steps mU help reduce tiie
stormwater impacts of bridge maintenance:
• Site new bridges so tiiat significant adverse impacts to wetiands, sensitive ai-eas, critical
habitat, amd riparian vegetation ar-e imnindzed.
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Road and Street Maintenance SC-7Q
« Design new bridges to avoid the use of scupper drains and route imioff to land for ti-eatment
conttol. Existing scupper drains should be cleaned on a regular basis to avoid
sedim ent/debris accumidation,
B Reduce tide dscliarge of poUutants to smface waters during maintenance by using
suspended ttaps, vacumns, or booms in the water to capttrre paint, mst, aud paint removing
agents. Many of tiiese wastes may be hazai-dous. Properly dspose of this -waste by refening
to CA21 (Hazardous Waste Management) in tiie Constmction Handbook.
a Train employees and subconttactors to reduce the dscharge of wastes dnrhig bridge
maintenance.
De-icing
a Do not over-apply deicing salt and sand, and routinely cahbrate spreaders.
a Near reseiYofrs, restrict the apphcation of ddchig salt and redirect any runoff away from
reservofrs.
a Consider using altemative deichig agents (less toxic, biodegradable, etc.).
References and Resources
Model Urban Runoff Program: A How-To Guide for Devdophig Urban Runoff Programs for
SmaU Munidpalities. Prepared by City of Monterey, City of Santa Cmz, Cahfomia Coastal
Commission, Monterey Bay National Marine Sanctuaty, Assodation of Monterey Bay Area
Govemments, Woodward-Clyde, Centtal Coast Regional Water Quahty Conttol Board. July.
1998.
Orange County' Stormwater Program
http: /Avww,0cwatersheds, com /stormwater /swp dittoduction. asp
Oregon Association of Clean Water Agendes. Oregon Munidpal Stormwater Toolbox for
Maintenance Practices.. Jmie 1998. - —• - -
Santa Clara Valley Urban Runoff PoUution Prevention Program. 1997 Urban Runoff
Management Plan. September 1997, updated October 2000.
Santa Clara Valley Urban Runoff Pollution Prevention Program. 2001. Fresh Concrete and
Mortar- Apphcation Best Management Practices for fhe Constiuction Industty. June,
Santa Clara Valley Urban Rimoff PoUution Prevention Program, 2001, Roadwork and Pavhig
Best Management Practices for the Constmction Industry', June,
Umted States Envfronmental Protection Agency (USEPA), 2002, PoUution Prevention/Good
Housekeeping for M:imicipal Operations Roadway and Bridge Mlamtenance. On-lhie
http://ww,epa,gov/npdes/m.enuofbmps/polI i.'^,.htm
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Municipal
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Landscape Maintenance SC-73
Description
Landscape maintenance acti\ities include vegetation removal;
herbicide and insectidde application; fertihzer apphcation;
watering; and other gardemng and la-wn care practices.
Vegetation conttol topically involves a combination of chemical
(herbicide) apphcation and mechanical methods. AU of tiiese
maintenance practices have the potential to contribute poUutants
to the storni di-ahi system. The major objectives of this BMP are
to mininuze tiie discliarge of pesticides, herbicides and fertiUzers
to fhe storni drain system and receiving waters; prevent fhe
dsposal of landscape waste into the storm drain system by
coUecting and properly disposing of chppings and cuttings, and
educating employees and the public.
Approach
PoUution Prevention
a Implement an integrated pest management (IPM) progi-am.
IPM is a sustainable approach to managing pests by
combining biological, cidtm-al, phj'sical, and chemical tools.
B Choose low water usmg flowers, ti-ees, slmibs, and
gi-oimdcover.
m Consider altemative landscaping teclmiques such as
nattu-escaping and xeiiscaphig.
m Conduct appropriate maintenmce (i. e. properly timed
fertUizmg, weedng, pest contt-ol, and pnnung) to help
presen'e tiie landscapes water efficiency.
Objectives
a Contain
a Educate
a Reduce/lVlinimize
a Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0
0
0
0
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SC--73 Landscape Maintenance
a Consider grass cychng (gi-ass cycHng is die natural recychng of grass by leaving tiie chpphigs
on fhe lawn when mo^ving. Grass chppings decompose quickly and release valuable
nutiients back into tiie lawn),
Suggested Protocols
Mowing, Trimming, and Weeding
B Whenever possible use mechaiucal metihods of vegetation removal (e.g mo-ivmg witii ttactor-
type or push mowers, hand cutting with gas or electiic powered weed trimmers) rather tiian
applying herbiddes. Use band weedng where practical.
a Avoid loosening the soU when conducting mechanical or manual weed conttol, tiiis could
lead to erosion. Use mulch or other erosion conttol measmes when sods are exposed.
• Performing mowhig at optimal times. Mowing should not be performed if significant rain
events are predicted.
a Mulching mowers may be recommended for certam flat areas. Otiier techniques may be
employed to mkdmize mowng such as selective vegetative planting using low maintenance
grasses and shmbs.
I CoUect laivn and garden chpphigs, pranrng waste, ttee trimmings, and weeds. Chip if
necessaty, and compost or dspose of at a landfiU (see waste management section of tius fact
sheet),
I Place temporarily stockpiled material away from watercomses, and berm or cover stockpUes
to prevent material releases to storm d-ains,
Plantmg
I Determine existing native vegetation featmes (location, species, size, function, importance)
and consider the feasibihty of protecting them. Consider elements such as tiidr effect on
dramage and erosion, hai-dmess, mahitenance requirem-ents, and possible conflicts betiveen
preserving vegetation and fhe residting maintenance needs. -
• Retahi and/or plant selected native vegetation whose f eatm-es are determined to be
beneficial, where feasible. Native vegetation usually requires less mamtenance (e.g.,
irrigation, fertUizer) than planting new vegetation.
a Consider using low water use gromidcovers when planting or replanting.
Was te Man agem ent
B Compost leaves, sticks, or otiier coUected vegetation or dspose of at a permitted landfiU. Do
not dspose of collected vegetation hito watenvays or storm drahiage systems,
a Place temporarily stockpiled material away from watercomses and storm drain unlets, and
berm or cover stockpUes to prevent material releases to the storm drain system,
a Reduce the use of Ihgh nitt-ogen fertihzers that produce excess grovrth requiring more
frequent mo^ving or trimming.
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Landscape Maintenance SC-73^
a Avoid landscape wastes in and aroimd storm di-am hdets by eitiier ushig bagging equipment
or by manuaUy picking up the material.
Irrigation
B Where practical, use automatic timers to mioiimze nmoff,
B Use popup spiinkler heads in areas mth a lot of activity or where there is a chance fhe pipes
may be broken. Consider the use of mechanisms tiiat reduce water flowto sprhdder headsif
broken.
a Ensm-e fhat there is no runoff from the landscaped area(s) if re- daimed water is used for
irrigation.
a If hading of muddy water is required (e.g. when repairing a water Ihie leak), do notputitin
the storm drain; pour over landscaped areas.
a Iirigate slowly or pulse irrigate to prevent runoff and then only irrigate as much as is
needed.
a Apply water at rates that do not exceed die infilttation rate of the soU.
Fertilizer andPesticide Management
a Utihze a comprehensive management system tiiat incorporates krtegrated pest management
(IPM) techniques. There are many methods and types of IPM, uicluding the foUowing:
- Mulching can be used to prevent weeds where turf is absent, f enchig instaUed to keep
rodents out, and netting used to keep bfrds and insects away from leaves and fruit.
- Visible hisects can be remioved by hand (witii gloves or ttveezers) and placed in soapy ^
water or vegetable oU. Altematively, insects can be sprayed off the plant with water or in
some cases vacuumed off of larger plants.
- Store-bought fraps, 5uch_a^ spedes-specffic, pheromone-based ttaps or coloredjticky
cards, can be used.
- Slugs can be tt-apped in small cups fiUed mth beer fhat are set hi fhe groimd so the slugs
can get in easily,
- In cases where microscopic parasites, such as bacteria and fimgi, ai-e causing damage to
plants, fhe affected plant material can be removed and disposed of (pnmhig equipment
should be disinfected with bleach to prevent spreadng the dsease organism),
- SmaU mammals and bfrds can be excluded udng fences, netiing, ti-ee tnink guards,
- Benefidal organisms, such as bats, birds, green lacewings, ladybugs, praying mantis,
ground beeties, parasitic nematodes, tiichogramma wasps, seed head weevils, and
spiders tiiat prey on detrimental pest species can be promoted,
I FoUow all federal, state, and local laws and regulations goveming the use, storage, and
disposal of fertilizers and pestiddes and ttaining of apphcators and pest contt-ol ad\isors.
January 2003 California Stormwater BMP Handbook 3 of6
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SC-73 Landscape Maintenance
m Use pesticides only if tiiere is an acttial pest problem (not on a regular preventative
schedule).
B Do not use pesticides ff rain is expected. Apply pestiddes only when wind speeds are low
(less than 5 mph).
• Do not mix or prepare pesticides for apphcation near- storm drains.
B Prepare tiie minimimi amoimt of pestidde needed for fhe job and use fhe lowest rate that
mR effectively conttol fhe pest.
a Employ teclmiques to mininuze off-target application (e.g, spray drift) of pesticides,
includng consideration of altemative apphcation teclmiques.
a . Feifihzers should be worked into fhe soU rather than dumped or broadcast onto the surface,
a Calibrate fertihzer and pestidde application equipment to avoid excessive apphcation,
• PeriodcaUy test soils for determining proper fertihzer use.
I Sweep pavement and sidewalk ff fertihzer is spUled on these smfaces before applying
inigation water.
• Pmchase only fhe amount of pesticide that you can reasonably use in a given time period
(month or year dependng on fhe product).
« Triple rinse containers, and use rinse water as product. Dispose of unused pestidde as
hazardous waste.
t Dispose of empty pesticide containers accordhig to tiie instmctions on the container label,
/nspection
• Inspect irrigation system periodically to ensme fhat the-right-amount of water is being - -
applied and that excessive nmoff is not occurring. Miiumize excess watering, and repair
leaks in the irrigation system as soon as they are observed.
a Inspect pesticide /fertihzer equipment and tt-ansportation vehicles daUj',
Trahiing
m Educate and ttain employees on use of pesticides and in pesticide application techniques to
prevent poUution. Pesticide apphcation mustbe under tiie supervision of a Cahforrda
quahfied pestidde apphcator,
• Train/encom-age municipal maintenance crews to use IPM techniques for managing pubhc
green areas.
a AnnuaUy ttain employees within departments responsible for pesticide apphcation on fhe
appropriate portions ofthe agency's IPM Pohcy, SOFs, and BMPs, and fhe latest IPM
techniques.
4 of 6 California Stormwater BMP Handbook January 2003
Municipal
www.cabmphandbooks.com
Landscape Maintenance SC-73
" E mployees who are not autiiorized and ttained to apply pestiddes shoidd b e periodcaUy (at
least annuaUy) informed that tiiey caimot use over-the-comiter pestiddes in or around fhe
workplace,
a Use a ttaining log or simUar method to docmuent ti-aining.
Spill Response and Prevention
• Refer to SC-ii, SpUl Prevention, Conttol & Cleanup
B Have spdl cleanup materials readUy avaUable and in a know in location
a Cleanup spUIs immedately and use dry methods if possible.
• Properly dispose of spiU cleanup material.
Other Considerations
B The Federal Pesticide, Fungicide, and Rodenticide Act and Califomia Titie 3, Division 6,
Pesticides and Pest Conttol Operations place stiict conttols over pesticide apphcation and
handhng and spedfy ttaining, annual refresher, and testing requirements. Tire regulations
generally cover: a hst of approved pesticides and selected uses, updated regularly; general
application information; equipment use and maintenance procedmes; and record keeping.
Tlie Cahfomia Department of Pesticide Regulations and the County Agricultm-al
Commission coordnate and maintain the licensing and certification programs, AU pubhc
agency employees who apply pesticides and herbicides in "agricultirral use" areas such as
parks, golf comses, rights-of-way and recreation areas should be properly certified in
accordance with state regulations, Conttacts for landscape maintenance should hiclude
similar requirements.
s All employees who hande pesticides should be famUiar vrith fhe most recent material safet}'
data sheet (MSDS) files.
a Murucipahties do not have tiie authority to regulate the use of pesticides by school dstricts,
however the CaHfomia Healthy:Schools-Act of 2000 (AB 2260) h-as imposed requirements' -
on Cahfomia school dstricts regarding pesticide use in schools. Posting of notification prior
to the application of pestiddes is now required, and IPM is stated as fhe pref erred approach
to pest management in schools.
Requirements
Costs
Addtional ttaining of municipal employees wUl be required to address IPM techniques and
BMPs. IPM methods -wjll likely increase labor cost for pest conti'ol which maybe offset by lower
chemical costs.
Mahitenance
Not apphcable
January 2003 California Stormwater BMP Handbook 5 of 6
Municipal
www, cabmphandbooks. com
SC-73 Landscape Maintenance
Supplemental Information
Further Detail of the BIMP
Waste Management
Composting is one of the better dsposal altematives if locaUy avaUable, Most municipalities
either have or are planning j'ard waste composting facihties as a means of reducing the amoimt
of waste gohig to tire landfill. Lara chppings from municipal maintenance programs as weU as
pnvate som-ces would probably be compatible mih most composting facUities
Contractors and Other Pesticide Users
Himidpal agencies should develop and implement a process to ensme that any conttactor
employed to conduct pest conttol and pesticide apphcation on municipal property engages in
jest control methods consistent with fhe IPM Pohty adopted by the agency. SpecificaUy,
Jiurdcipahties should requfre conttactors to foUow the agency's IPM pohcy, SOPs, and BMPs;
jro\ide e^idence to the agency of having recdved ttaining on current IPM techniques when
feasible; pro-^ide documentation of pesticide use on agency property to the agency in a timely
maimer.
References and Resources
Eng Coimty Stormwater PoUution Conttol Manual. Best Management Practices for Businesses.
1995. King County Surface Water Management July, On-line:
http: // dnr. mettokc. go v/wh-/dss / spcm .htm
Los Angeles County Stormwater Quality Model Programs. Pubhc Agency Activities
http://ladpw.org/wmd/npdes/model hiiks.cfm
Model Urban Runoff Program: A How-To Guide for Developing Urban Runoff Programs for
Small IVIunicipalities. Prepared by City of IVIonterey, City of Santa Cmz, Cahfomia Coastal
Commission, Monterey Bay National Marine Sanctiiaty, Association of Monterey Bay Area
Governments, Woodward-Clyde, Centtal Coast Regional Water Quahty Conttol Board. July.
_ _ . . _ . , ...
Orange County Stormwater Program
http:/Aww.ocwatersheds.com/StormWater/s\vp inttoduction.asp
Santa Clara Valley Urban Rimoff PoUution Prevention Program. 1997 Urban Runoff
-Management Plan. September 1997, updated October 2000.
United States Environmental Protection Agency (USEPA). 2002. PoUution Prevention/Good
Hoirsekeeping for Municipal Operations Landscaping and La^vn Care, Office of Water Office of
Wastewater Management, On-hne: http://ww,epa,.gov/npdes/menuofbmps/poll 8,htm
6 of 6 California Stormwater BMP Handbook January 2003
Municipal
www, cabmphandbooks, com
E. Soil Percolation Test Result by MTGL
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December 9, 2011
Grand Pacific Resorts, Inc.
5900 Pasteur Court, Suite 200
Carlsbad, California 92008
Project No. 1916-B08
Log No. 11-1452
Attention:
Subject:
Mr. Houston Amold
Percolation Test
MarBrisa Phase II
Carlsbad, California
Dear Mr. Arnold:
In accordance with your request and authorization, we have completed a percolation test at the
Carlsbad Ranch, Planning Area 5, Marbrisa Resort Phase 2.
The percolation test was perfonned at one location shown in the attached Figure-1. The test hole
consist of 6-inch diameter and 48" deep with a 4" diameter perforated standpipe. Soil
encountered in the test hole was visually classified. It consisted of approximately 18 inches of fill
underiain by tenace deposit. The encountered soU generally consisted of silty clayey sand.
Gravel was placed at the bottom and around the standpipe then the hole was filled completely
with water for the pre-soaking phase ovemight. The following day, the test hole was again
filled with water to let the soil rehydrate. Test hole was refilled with water after at least 20
minutes. Then the water drop at every 15 minutes was measured and at the same time the hole
was refilled with water such that a minimum of 6 inches of water remains in the test hole. The
test measurement was continued until the drop rates remain constant. The percolation rate was
calculated based upon the last reading, a percolation rate of 27 minutes per inch.
If you have any quesdons regarding this letter, please do not hesitate to contact our office.
Respectfully submitted,
MTGL, Inc.
Eduardo C. Dizon, RCE
Senior Engineer
Attachment: Figure 1 - Percolation Location Plan
Approximate Location of Percolation Test
PERCOLATION LOCATION PLAN
MARBRISA RESORT, PHASE 2
Project No, 1916-B08 Date: DEC. 2011 FIGURE 1