HomeMy WebLinkAboutCT 06-17; El Camino Terrace; Parcel 3 of Map 18059 El Camino Terrace; 2009-07-07K&S Planning Engineering Surveying
PRELIMINARY
STORMWATER MANAGEMENT
And
STORMWATER MAINTENANCE PLAN
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
PARCEL 3 OF MAP 18059
EL CAMINO TERRACE
30 OFFICE CONDOMINIUMS
Prepared By
K&S Engineering
7801 Mission Center Court, Suite 100
San Diego, CA 92108
§£
Prepared For
Tycoon Development Corporation
2371 Fenton Street
Chula Vista, CA. 91914
October 2007
K&S Job #05-062
7801 Mission Center Court, Suite 100 . San Diego, California 92108 . (619)296-5565 . Fax (619) 296-5564
Section
1.0
2.0
3.0
3.1
4.0
4.1
4.2
4.3
5.0
5.1
5.2
5.3
5.4
5.5
6.0
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7.0
8.0
9.0
10.0
TABLE OF CONTENTS
INTRODUCTION
PROJECT DESCRIPTION
Figure 1 - Location Map
HYDROLOGIC UNIT CONTRIBUTION
Figure 2 - Carlsbad Watershed
Beneficial Use
Table 1 - Beneficial Uses
Figure 3 - Vicinity Map
CHARACTERIZATION OF PROJECT RUNOFF
Constituents of Concern and Sources
Table 2 - Project Pollutant Categories
Soil Characteristics
Site Hydrology
Figure 4 - Project Information Site Map
Figure 5 - Post Construction BMP Site Map
MITIGATIVE MEASURES To PROTECT WATER QUALITY
Site Design BMPs
Source Control BMPs
Table 3 - Project Storm Water BMP Requirement Matrix
BMPs Applicable to Individual Priority Project Categories
Treatment Control BMPs
Summary
Table 4 - Treatment Control Selection Matrix
OPERATION AND MAINTENANCE PROGRAM
LANDSCAPING & IRRIGATION
INTEGRATED PEST MANAGEMENT (IPM) PROGRAM
MATERIAL STORAGE
TRASH ENCLOSURES
STORM DRAIN SIGNAGE
FILTER INSERTS
VEGETATED FILTER STRIPS
STORMWATER BIORETENTION FILTRATION SYSTEM
HYDROSEEDING
Table 5 - BMP Maintenance Scheduling
EDUCATION AND OUTREACH
FISCAL RESOURCES
Table 6 - BMP Estimated Maintenance Costs
CONCLUSION
CERTIFICATION / SIGNATURE SHEET
Page
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30
ATTACHMENTS 31
A HYDROLOGY STUDY
JB PERMANENT BMP INFORMATION
Landscaping & Irrigation
Integrated Pest Management (IPM) Program
Material Storage
Trash Enclosures
Storm Drain Signage
Filter Inserts
Vegetated Filter Strips
Bioretention Fltration System
Hydroseeding
STORM WATER APPLICABILITY CHECKLIST
Preliminary
Stormwater Management & Maintenance Plan
El Camino Terrace
1.0 INTRODUCTION
The California State Water Quality Control Board approved Order Number 2007-01 (Order) on
January 24, 2007. The Order updates the original NPDES Storm Water Permit, Order No. 2001-01 and outlines
the storm water discharge requirements for municipal separate storm sewer systems (MS4s), which drain
"development" areas from watersheds within:
1.) The County of San Diego,
2.) Incorporated cities of San Diego County, and
3.) San Diego Unified Port District.
The City of Carlsbad is one of the municipal co-permittees identified in the order and, therefore, subject to its
requirements.
In general, the order requires that Best Management Practices (BMPs):
• Control the post-development peak storm water storm discharge rates and velocities to maintain or
reduce pre-development downstream erosion
• Minimize storm water pollutants of concern in urban runoff from new development through
implementation of source control BMPs
• Remove pollutants of concern from urban runoff through implementation of structural treatment
BMPs
" Include proof of a mechanism, to be provided by the project proposal, which will ensure ongoing
long-term structural BMP maintenance. In addition, structural BMPs shall be located to infiltrate,
filter, or treat the required runoff volume or flow (numeric sizing criteria) prior to discharge to any
receiving water body supporting beneficial uses.
This "numeric sizing criteria" is either volume or flow based. Specifically, volume based BMPs must be
designed to infiltrate, filter, or treat the volume of runoff produced from a 24-hour - 85* percentile storm event.
This is approximately 0.6 inches of runoff for San Diego County. Similarly, flow based BMPs must be designed
to infiltrate, filter or treat a flow rate of 0.2 inches of rainfall per hour. Note that the above "numeric sizing
criteria" allows the option of infiltration, filtering or treatment of this volume/flow and relates only to water
quantity. Retention or detention of water volume/flow is not a requirement of the "numeric sizing criteria."
This Storm Water Management Plan (SWMP) proposes to address the possible water quality impacts from the
grading and improvements of the El Camino Terrace (Project) located in the 5400 block of El Camino Real and
define the potential Best Management Practice (BMP) options that satisfy the requirements, identified in the
following documents:
1.) City of Carlsbad Standard Urban Storm Water Mitigation Plan, Storm Water Standards, (Standards)
April 2003
2.) Standard Specifications for Public Works Construction,
3.) NPDES General permit for Storm Water Discharges Associated with Construction Activity, and
4.) County of San Diego Municipal NPDES Storm Water Permit (Order Number 2007-01).
The goal of this SWMP is to develop and implement the best available procedure policies of the Standards to
insure to the maximum extent practicable that development does not increase pollutant loads from the project
site and considers urban runoff flow rates, potential pollutants, and velocities. The SWMP also intends to insure
the effectiveness of the Best Management Practices (BMP) through proper maintenance that is based on
long-term fiscal planning.
According to the Storm Water Requirements Applicability Checklist (Appendix A of the Standards) (see
Appendix C of this report), the Project is subject to;
• Part A - the Priority Project Permanent Storm Water BMP requirements
• Part B - the Standard Permanent Storm Water BMP requirements
• Part C - the Construction Storm Water BMP Performance Standards and is required to prepare a
Storm Water Pollution Prevention Plan (SWPPP) and
• Part D - Medium Priority construction site ranking due to discharging to a tributary to a sensitive
water body.
This SWMP is subject to revisions as needed by the engineer.
CT06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Preliminary
Stonnwater Management & Maintenance Plan
El Ccimino Terrace
2.0 PROJECT DESCRIPTION
The Project is located on Assessors Parcel No. 209-040-42-00, more formerly known as Lot 3, of Map 18059.
The 1.48 acre site is located adjacent and easterly of El Camino Real and southerly of Cougar Street.
The Project consists of the fine grading of an existing rough graded site for the construction of one commercial
building and its associated parking and landscaped areas. The existing site contains driveway paving, underground
storm drain piping and storm drain inlet structures that will be utilized by the Project development. Landscaped area
site improvements for all permeable disturbed areas, as well as some undisturbed permeable areas, are integral
elements of the proposed Project.
In general, the proposed site will surface-drain via overland flows and channelizing ribbon gutters to a
proposed grated inlet in the northerly portion of the parking lot and to existing curb inlets located along the
paved access drive, within a mutual use access easement. The curb inlets located in the existing driveway on the
east drain to an existing storm drain system. The drainage for this project eventually flows into the Agua
Hedionda Creek to the Pacific Ocean.
FIGURE 1
CITY OF OCFANSIDF
CITY Of
SAN MARCOS
PACIFIC
OCEAN
\CITY or
TNCINITAS
NOT TO SCALE
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
I
I
I
Preliminary
Stormwater Management & Maintenance Plan
El Ca/nino Terrace
3.0 Hydrologic Unit Contribution
According to the State of California, Regional Water Quality Control Board, San Diego Hydrologic Basin
Planning Area, the Project is located in the Los Manos hydrologic sub-area (HSA) (904.31) of the Carlsbad
Watershed hydrologic unit (HU). The area is characterized by mostly moderately sloping land occupied by
predominately non-native grass and urban uses. Land use within the watershed is dominated by urban
development. Natural habitats are scattered and occur in a matrix of agricultural and urban development,
however several relatively large patches of native vegetation occur in the eastern portion of the watershed and in
the central area just inland from Agua Hedionda Lagoon.The cities of Carlsbad, San Marcos, and Encinitas are
located entirely within the HU. Approximately 48% of the Carlsbad HU is urbanized. The dominant land uses
are residential (29%), commercial/industrial (6%), freeways/roads (12%), agriculture (12%), and
vacant/undeveloped (32%). The Agua Hedionda HA comprises approximately 14% of the HU.
Constituents of concern for the HU include coliform bacteria, nutrients, sediment, trace metals, and toxics.
The Agua Hedionda, Buena Vista, and San Elijo lagoons are experiencing impairments to beneficial uses due to
excessive coliform bacteria and sediment loading from upstream sources. These coastal lagoons represent
critical regional resources that provide freshwater and estuarine habitats for numerous plant and animal species.
Other water bodies in the Carlsbad HU have been identified as impaired on the California 303(d) list for
elevated coliform bacteria. Specific waterbodies affected by the Project are identified in Section 4.0.
The Project's 1.48 acres (±1.1 acres disturbed) represents an extremely small percentage of the approximately
210 square miles (134,400 acres) of the hydrologic unit area and representing 0.1 % of the hydrologic unit area.
The existing site contains ±0.13 acres of impervious surface area that increases to ±0.91 acres in the planned
developed condition. The "Project" will not alter the overall drainage pattern of the site before entering the
storm drainage system. The drainage within Cougar Drive is designed for total build-out of this development.
Therefore, the increase in imperviousness of the Project will have a negligible impact on the hydrologic unit
with the proper implementation and maintenance of the permanent BMPs outlined in this report and the proper
implementation and maintenance of the construction phase BMPs identified in the Storm Water Pollution
Prevention Plan (SWPPP).
FIGURE 2
Approximate
Project
Location
Sol;leach
Carlsbad Watershed Hydrologic Unit
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Preliniinaiy
Stormwater Management & Maintenance Plan
El Camino Terrace
3.1 Beneficial Use
Designated beneficial uses within the Los Manos HSA and the downstream locations of Agua Hedionda
Creek and Agua Hedionda Lagoon are limited to surface water, coastal water and ground water. Those uses are
identified in Table 1. The data contained in this Table is extracted from the Water Quality Control Plan for the
San Diego Basin.
TABLE 1
Beneficial Uses
Municipal and Domestic Supply
Agricultural Supply
Industrial Service Supply
Contact Water Recreation
Non-Contact Water Recreation
Commercial and Sport Fishing
Warm Freshwater Habitat
Estuarine Habitat
Wildlife Habitat
Biological Habitats
Rare, Threatened, or Endangered
Marine Habitat
Migration of Aquatic Organisms
Aquaculture
Shellfish Harvesting
Spawning, Reproduction and/or Early
Development
Inland Surface
Water
X
X
X
X
X
X
X
Coastal Waters
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Ground Water
O
O
O
Beneficial Uses
X Existing Beneficial Use
O Potential Beneficial Use
The reader is directed to the Water Quality Control Plan for the San Diego Basin for more detailed
descriptions of the above beneficial uses.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
I
I
Preliminary
Stonnwater Management & Maintenance Plan
El Caiuino Terrace
FIGURE 3
0.7
2 mi
* M
G=-0.156
Vicinity Map
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Preliminary
Stormwater Management & Maintenance Plan
El Caniino Terrace
4.0 CHARACTERIZATION OF PROJECT RUNOFF
According to the California 2002 303d list published by the San Diego Regional Water Quality Control
Board, Agua Hedionda Creek and Agua Hedionda Lagoon are the only impaired water bodies downstream of
the Project. The Project area is approximately 2.9 miles upstream from the outlet of the lagoon to the Pacific
Ocean.
The Agua Hedionda Creek's impairment is for total dissolved solids for a length of 7 miles and a TMDL
classification of "Low". The identified sources of the pollutant/stressor are listed as:
• urban runoff/storm sewers.
• unknown nonpoint source.
• unknown point source.
The Agua Hedionda Lagoon's pollutant/stressors are bacteria indicators and sedimentation/siltation for an
area of 6.8 acres and a TMDL classification of "Low" on both. The identified source for both of the
pollutant/stressors is listed as nonpoint/point source.
4.1 Constituents of Concern and Sources
There are no sampling data available for the existing site condition.
In addition, the project is not expected to generate significant amounts of non-visible pollutants. However, the
constituents listed in Table 2.1 are commonly found on similar developments and could affect water quality.
TABLE 2
Priority
Project
Categories
Commercial
Development
>1 Acre
Parking Lots
Hillside
Development
>5,000 ft2
General Pollutant Categories
Sediments
p(D
p(i)
X
Nutrients
pd)
pd)
X
Heavy
Metals
X
Organic
Compounds
p(2)
Trash
&
Debris
X
X
X
Oxygen
Demanding
Substances
p(3)
p(l)
X
Oil&
Grease
X
X
X
Bacteria
&
Viruses
p(4)
Pesticides
p(3)
p(')
X
X = anticipated
P = potential
( 1 ) A potential pollutant if landscaping exists on-site.
(2) A potential pollutant if the project includes uncovered parking areas.
(3) Including solvents.
(4) A potential pollutant if land use involves food or animal waste products
Project Pollutant Categories
The potential sources for the constituents of concern for the project could be, but are not limited to those
listed below:
o Sediments - Sediments are soils or other surficial materials eroded and then transported or deposited by the action
of wind, water, ice, or gravity. Sediments can increase turbidity, clog fish gills, reduce spawning habitat, lower
young aquatic organisms survival rates, smother bottom dwelling organisms, and suppress aquatic vegetation
growth.
CT'06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Preliminary
Stomiwater Management & Maintenance Plan
El Camino Terrace
o Nutrients - Nutrients are inorganic substances, such as nitrogen and phosphorus. They commonly exist in the
form of mineral salts that are either dissolved or suspended in water. Primary sources of nutrients in urban runoff
are fertilizers and eroded soils. Excessive discharge of nutrients to water bodies and streams can cause excessive
aquatic algae and plant growth. Such excessive production, referred to as cultural eutrophication, may lead to
excessive decay of organic matter in the water body, loss of oxygen in the water, release of toxins in sediment, and
the eventual death of aquatic organisms.
o Metals - Metals are raw material components in non-metal products such as fuels, adhesives, paints, and other
coatings. Primary source of metal pollution in storm water are 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. At low concentrations
naturally occurring in soil, metals are not toxic. However, at higher concentrations, certain metals can be toxic to
aquatic life. Humans can be impacted from contaminated groundwater resources, and bioaccumulation of metals in
fish and shellfish. Environmental concerns, regarding the potential for release of metals to the environment, have
already led to restricted metal usage in certain applications.
o Organic Compounds - Organic compounds are carbon-based. Commercially available or naturally occurring
organic compounds are found in pesticides, solvents, and hydrocarbons. Organic compounds can, at certain
concentrations, indirectly or directly constitute a hazard to life or health. When rinsing off objects, toxic levels of
solvents and cleaning compounds can be discharged to storm drains. Dirt, grease, and grime retained in the
cleaning fluid or rinse water may also adsorb levels of organic compounds that are harmful or hazardous to aquatic
life.
o Trash & 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 & debris may have a significant impact on the recreational value of a water body
and aquatic habitat. Excess organic matter can create a high biochemical oxygen demand in a stream and thereby
lower its water quality. Also, in areas where stagnant water exists, the presence of excess organic matter can
promote septic conditions resulting in the growth of undesirable organisms and the release of odorous and
hazardous compounds such as hydrogen sulfide.
o Oxygen-Demanding Substances - This category includes biodegradable organic material as well as chemicals
that react with dissolved oxygen in water to form other compounds. Proteins, carbohydrates, and fats are examples
of biodegradable organic compounds. Compounds such as ammonia and hydrogen sulfide are examples of
oxygen-demanding compounds. The oxygen demand of a substance can lead to depletion of dissolved oxygen in a
water body and possibly the development of septic conditions.
o Oil and Grease - Oil and grease are characterized as high-molecular weight organic compounds. Primary sources
of oil and grease are petroleum hydrocarbon products, motor products from leaking vehicles, esters, oils, fats,
waxes, and high molecular-weight fatty acids. Introduction of these pollutants to the water bodies are very possible
due to the wide uses and applications of some of these products in municipal, residential, commercial, industrial,
and construction areas. Elevated oil and grease content can decrease the aesthetic value of the water body, as well
as the water quality.
o Bacteria and Viruses - 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. In addition, the decomposition of excess organic waste causes
increased growth of undesirable organisms in the water.
o Pesticides - Pesticides (including herbicides) are chemical compounds commonly used to control nuisance
growth or prevalence of organisms. Excessive application of a pesticide may result in runoff containing toxic
levels of its active component.
4.2 Soil Characteristics.
The project area consists of soil group D. Soil group D soils have very slow infiltration rate when thoroughly
wetted; chiefly clays that have a high shrink-swell potential, soils that have a high permanent water table, soils
that have a claypan or clay layer at or near the surface, or soils that are shallow over nearly impervious material.
Rate of water transmission is very slow.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Preliminary
Stonnwater Management & Maintenance Plan
El Camino Terrace
4.3 Site Hydrology
Per the Hydrological Analysis (Attachment A), the existing flow rate for the Project drainage areas from a
100-year storm event is 3.19 cfs. This currently drains from the site via an existing, temporary 12" riser with
weep holes. The existing drainage area of the Project drains through an underground storm drain system,
ultimately outletting to Agua Hedionda Creek.
In the proposed condition, the basin area remains unchanged and the runoff coefficient increases due to the
classification of the area changing from existing to commercial for the project. The flow for the proposed
condition is 8.31 cfs. This increase to the total storm flow is due to the change in the 'C' factor. The existing
drainage facilities, already sized for the ultimate developed conditions for the zoning, are capable of handling
the increase in flow. The project continues to drain to the same underground storm drain system piping
mentioned above.
CI'06-17, SDP 06-07, PUD 06-15 & SUP 06-04
BEST ORIGINAL
iGRAVEL BAGI
INLET PROTECTION,!
fTfP -A
FIBER
ROLLS
SILTT——
— FENCING!FIBER ROLL OR GRAVEL
BAG CHECK DAM ACROSS
SITE ACCESS AT END OF
EACH WORK DAY
(GRAVEL BAG CHECK!
DAM, TYP.J
STABILIZED CONSTRUCTION
ENTRANCE—
IBERMED MATERIALLY
(•STORAGE AND WASTE
MANAGEMENT AREAS!
PROJECT INFORMATION
LEGEND
Sg| K&S ENGINEERING, INC.
Planning . Engineering . Surveying
05-062
7801 Mission Center Court, Suite 100 Son Diego, CA 92108
(619) 296-5565 Fax: (619) 296-5564
FEATURE
DRAINAGE STRUCTURE FLOW
SURFACE FLOW (EXIST/PROP)
DRAINAGE AREA
LIMIT OF DISTURBANCE
SYMBOL B.M.P.
STABILIZED CONSTRUCTION ENTRANCE
SILT FENCE
FIBER ROLLS
GRAVEL BAG CHECK DAM BARRIER
GRAVEL BAG INLET PROTECTION
MATERIAL DELIVERY & STORAGE, SOLID WM-1.5,6.8.9
WASTE 4 SEPTIC WASTE MANAGEMENT
SYMBOL
NOTE:
BACCHARIS EMEH
BACCHARIS SAROTHROIOESENCEUS CALIFORNIA
ERIOGONUM FASCICUIATUU
HETEROMELES ARBUTIFOLIA
RHUS LAURINA
SALVIA MEUFERA
1
IN THE EVENT THAT THE CLEARED SITE REMAINS EMPTY FOR A PERIOD
OF MORE THAN THIRTY DAYS, THE AREA SHALL BE HYDROSEEDED.
THE HYDROSEED MIX SPECIFIED IS A NATIVE MIX AND WKJ. REQUIRE NO
IRRIGATION AFTER IT HAS BEEN ESTABLISHED. IRRIGATION TO ESTABLISH
SEED MIX WILL BE BY WATER TRUCK. HYDROSEED MIX:
ARTEMESIA CALIFORNIA (CALIFORNIA SAGEBRUSH) 4 IBS/ACRE
(COYOTE BRUSH) 4 LBS/ACRE
(DESERT BROOM) 2 LBS/ACRE
(CALIFORNIA SUNFLOWER) 8 LBS/ACRE
(CALIFORNIA BUCKWHEAT) 20 LBS/ACRE
(TOYON) 5 LBS/ACRE
(LAUREL SUMAC) 4 LBS/ACRE
(BLACK SAGE) 4 LBS/ACRE
SOL PREPARATION:
A. WATER ALL PLANTING AREAS THOROUGHLY AND CONTINUOUSLY
FOR THREE (3) CONSECUTIVE DAYS TO SATURATE UPPER
LAYER OF SOIL PRIOR TO HYDROSEEDING OPERATION.
B. ALLOW PLANTING AREA SOL SURFACE TO DRY OUT FOR ONE
DAY ONLY PRIOR TO THE HYDROSEEDING APPLICATION. CARE
MUST BE TAKEN TO NOT ALLOW THE SOIL SURFACE TO BE
SUPER SATURATED WITH WATER PRIOR TO THE HYDROSEEDINGINSTALLATION. AT THE SAME TIME THE SOIL SURFACE SHOULD
NOT BE BONE DRY. THERE SHOULD BE SOME RESIDUAL
MOISTURE WITHIN THE FIRST 1/4 INCH OF SOIL SURFACE.
C. BEGIN THE HYDROSEEDING OPERATION ON ALL AREAS AS
SPECIFIED HEREIN.
PREPARATION OF HYDROSEEDING MIXTURE:
A. THE SLURRY SHALL BE PREPARED AT THE SITE AND ITS
COMPONENTS SHALL BE MIXED TO SUPPLY THE RATES OF
APPUCATION AS PER SPECIFICATIONS.
B. SLURRY PREPARATION SHALL BEGIN BY ADDING WATER TO
THE UNK WHEN THE ENGINE IS AT ONE-HALF THROTTLE.
WHEN THE WATER LEVEL HAS REACHED THE HEIGHT OF THE
AGITATOR SHAFT AND GOOD REORCULATION HAS BEEN
ESTABLISHED, THE FERTILIZER SHALL BE ADDED TO THE
MIXTURE (THE TANK SHALL BE AT LEAST 1/3 FILED WITH
WATER AT THIS TIME).
C. THE ENGINE THROTTLE SHALL BE OPEN TO FULL SPEED
WHEN THE TANK IS 1/2 FILLED WITH WATER. ALL ORGANIC
AMENDMENTS, FIBER. AND CHEMICALS SHALL THEN BE
ADDED BY THE TIME THE TANK IS 2-1/3 TO 3/4 FULL
AT THIS TIME THE SEED MIX SHALL ALSO BE ADDED.
D. SPRAYING SHALL COMMENCE IMMEDIATELY WHEN THE TANK
IS FULL AND THE SLURRY IS MIXED.
APPUCATION: THE OPERATOR SHALL SPRAY THE AREA WITH A
UNIFORM VISIBLE COAT USING THE DARK COLOR OF THECELLULOSE FIBER OR ORGANIC AMENDMENT AS VISUAL GUIDE. THE
SLURRY SHALL BE APPLIED IN A DOWNWARD DRILLING MOTION
VIA A FAN STREAM NOZZLE.
TIME LIMIT: THE HYOROMULCHING SLURRY COMPONENTS ARE NOT
TO BE LEFT IN THE HYDROMULCHING MACHINE FOR MORE THAN
TWO HOURS. IF SLURRY COMPONENTS ARE LEFT FOR MORE THAN
TWO HOURS IN THE MACHINE, THE CONTRACTOR SHALL ADO SOX
MORE OF THE ORIGINALLY SPECIFIED SEED MIX TO ANY SLURRY
MIX WHICH HAS NOT BEEN APPLIED WITHIN THE TWO HOURS
AFTER MIXING. THE CONTRACTOR SHALL ADO 7SX MORE OF THE
ORIGINAL SEED MIX TO ANY SLURRY MIXTURE WHICH HAS NOT BEEN
APPLIED EIGHT HOURS AFTER MIXING. ANY MIXTURE NOT APPLIED
AFTER EIGHT HOURS SHALL BE REACTED AND DISPOSED OF
OFF-SITE AT CONTRACTOR'S EXPENSE.
CLEAN UP:
AS PROJECT PROGRESSES. CONTRACTOR SHALL MAINTAIN ALL
AREAS IN A NEAT MANNER AND REMOVE UNSIGHTLY DEBRIS AS
NECESSARY. AFTER COMPLETION OF PROJECT. CONTRACTOR SHALL
REMOVE ALL DEBRIS AND CONTAINERS USED IN ACCOMPLISHING
WORK. HE SHALL SWEEP AND CLEAN ALL SIDEWALKS. ASPHALT.
AND CONCRETE AREAS ADJACENT TO PLANTINGS.
SITE MAP
Figure
CT 08-17, SDP 06-07,
PUD 06-15. SUP 60-04
SHEET
1
CITY OF CARLSBAD
ENGINEERING DEPARTMENT
SHEETS
2
STORM WATER MANAGEMENT PLAN FOR
EL CAMINO TERRACE
PARCEL 3 OF MAP 18059
CARLSBAD TRACT NO. CT -
SCALE: 1'=20'
CATCH BASIN
; FILTER INSERT,
TYP.
VEGETATE
FILTER STRIP,
TYP.
STORM
SIGMGE
TENCIL
VEGETATED
FILTER STRIP,
TYP.-*
POST-CONSTRUCTION MAINTENANCE PLAN
»T me comma* OF THE pRarcr. THE FOLLO*NC PLAN SHALL BE FOLLOHED ro
ENSURE WHICH OUAUTY CONJKOL IS KM/MINED FOR THE UfC OF IHE PROJECT:
snauzjinoN: *u PUNTED SLOPES *«) OINER VEGEHTED <WEXS SH<UI BE NSPECIEDPRIOR TO OCTOBER I Of E/ICH IE« /WD VTER KXJOR R/VNF/Ui EVENTS (KOBE THAN M INCH)
UNO REP/URED <«0 REPUNfED AS NEEDED.
2 STRUCTURE PfHCTICfS: DESLTNC BASINS. CTVtRS/ON DITCHES. DOHMWAINS. MLET5. OURETPROTECTION MEASURES. AND OTHER PERUANENr WATER OUAUTY AND SEOUENr AND EROSKWCONTRaS SHALL BE INSPECTED PRKR TO OCTOBER Of EACH IEAR AND AF7TR KAJOR RAINFAUEVENTS (WORE THAN X NCH;. REPAIRS AND REPLACEMENTS SHALL BE UADE AS NEEDED ANDRECORDED IN THE MAINTENANCE IOC.
3. OPERATION AND MAINTENANCE. fUNONC: POSr-CONSITjUCITON MANAGEMENr MEASURES ARE THERESporasiurr OF THE DEVQOPER UNH. THE TRANSFER or RESPECTIVE SITES TO THE NE*
OINERS. Af THAT fflC THE NEW CWERS SHAH ASSUME RESPONSIBUTr FOR THEF
RESPECTIVE PORTIONS OF THE DEVELOPMENT.
fiERHMABW POST-CONSTRUCTION BMP NOTES
O I. OPERATION AND MAINTENANCE SHALL BE SECURED BY AN EXECUTED AND RECORDED
nO MAINTENANCE AGREEMENT. COVENANTS CONDITIONS AND RESTRICTIONS (CCWS). OR
O O ANOTHER MECHANISM APPROVED Br THE C/TT ENGINEER. THAT ASSURES ALL PERMANENT*O BMPs WLL BE MAINTAINED PER THE STORM VATER STANDARDS MANUAL
-PROWe 2" OIAU. CURB CORES
WHERE INDICATED OK PLAN
„.„.„ ,. ,. DROUGHT TOLERANT
!£T:a\M / PLANTWCS PER LANDSCAPE(SEE PLAN)
SAND
^CRUSHED
6" PERFORATED PIPE.
SO 35 OR EQUAL
SLOPE PER PLAN TO
OUTLET - 0.5X MM.
VEGETATED FILTER STRIP
NOT TO SCALE
K&S ENGINEERING, INC.
Planning . Engineering . Surveying
05-062
7801 Mission Csnler Court, Suile 100 San Diego. CA 92108
(619) 296-5565 rax: (619) 296-5564
POST CONSTRUCTION BMP
LEGEND
DRAINAGE STRUCTURE FLOW
SURFACE FLOW (EXIST/PROP)
DRAINAGE AREA
LIMIT OF DISTURBANCE —
TRASH ENCLOSURE AREA
ROOF DRAIN OUTLET
STORM DRAIN SIGNAGE OR STENCIL
BMP MAP
PERVIOUS AREA
PAVEMENT AREA (CONC.-ASPH.)
PAVEMENT AREA (EXIST. TO REMAIN)
BUILDING FOOTPRINT
STORMWATER BIORETENTION FILTRATION SYSTEM
(TREATMENT CONTROL BMP)
2" DIAMETER CORE ON CURB
CATCH BASIN FILTER INSERT
(TREATMENT CONTROL BMP)
VEGETATED SWALE W/UNDERDRAIN
(TREATMENT CONTROL BMP)
Figure
CT 06-17, SDP 06-07,
PUD 06-15, SUP 60-04
SHEET
2 CITY OF CARLSBAD
ENGINEERING DEPARTMENT
SHEETS2
STORM WATER MANAGEMENT PLAN FOR
EL CAMINO TERRACE
PARCEL 3 OF MAP 18059CARLSBAD TRACT NO. CT -
SCALE: 1"=20'JF PIMI SIZE IS LESS THAN Z4"l
TOE IS A REDUCED COPY.SCALE PtiUf ACCORDINGLY.
Preliniiiiai'v
Stormwater Management & Maintenance Plan
El Cainino Terrace
5.0 MITIGATIVE MEASURES TO PROTECT WATER QUALITY
As a Priority Project, specific storm water BMP requirements must apply, where applicable. Priority projects
incorporate particular BMPs to ensure that those projects reduce potential urban pollutant runoff to the
maximum extent practicable (MEP). These storm water pollution prevention requirements are site specific and
vary based on the project's potential impact on receiving water quality.
To address water quality for the project, BMPs will be implemented during construction and post construction
phases. Per Section II, Table 1 of the Standards, the Project is best described as belonging to the Commercial
Development >1 Acre, Parking Lot and Hillside Development >5,000 ft2 categories.
Priority projects are subject to the requirements of all priority project categories that apply (as shown in
Table 3):
• Site Design BMPs
• Source Control BMPs
• BMPs applicable to Priority Project specific categories:
1. Private Roads,
2. Dock Areas,
3. Maintenance Bays,
4. Outdoor Processing Areas,
5. Surface Parking Areas and
6. Hillside landscape
In addition, incorporated into the Project are appropriate site design and source control BMPs for Standard
Projects.
5.1 Site Design BMPs
The Project has incorporated specific site design characteristics to provide a minimum of impervious areas on
the site. The maximum number of compact car parking spaces allowed by code reduces the pavement areas in
surface parking areas. Utilization of existing paved areas for access and existing driveway reduces impermeable
areas and affords a greater level of safety on Cougar Drive by not introducing any new driveway openings.
The landscaped areas provide an efficient use of permeable areas. Roof drainage flows are directed into
landscaped areas adjacent to and sloping away from building structures. Installation and monitoring of the
irrigation system for these landscape areas will reduce over-irrigation, thereby reducing the oversaturation of the
areas leading to excess runoff. All existing areas outside of the disturbed areas remains in a natural state or will
incorporate major plantings into the new landscape scheme. The conservation preserves native trees and shrubs,
lessening the impact of this development on the surrounding area. The landscaped areas of the site will utilize
native or drought tolerant species in the planting scheme.
All storm flows will exit the site in the same locations as in the existing condition. The slight increase in
post-development peak flow by the increase of impermeable area is accounted for in the design of the existing
drainage improvements for the ultimate build-out of this developable parcel.
5.2 Source Control BMPs
Source control BMPs, including construction stage BMPs, are selected, constructed, and maintained to
comply with all applicable ordinances and guidance documents. The Project SWPPP will identify and detail
construction BMPs that may include, but not be limited to, the following:
Silt Fences, Fiber Rolls, Street Sweeping & Vacuuming, Storm Drain Inlet Protection, Stockpile
Management, Solid Waste Management, Stabilized Construction Entrance/Exit, Vehicle & Equipment
Maintenance, Gravel Bag Berms, Material Delivery & Storage, Spill Prevention & Control, Concrete
Waste Management, Water Conservation Practices, Paving & Grinding Operations, Stabilization of
Disturbed Areas, and Permanent Revegetation of Man-made Slopes.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 11
Preliminarv
Stormwater Management & Maintenance Plan
El Camino Terrace
TABLE 3
Project
Category
Standard
Projects
Site
Design
BMPs
R
Source
Control
BMPs
R
BMPs Applicable to Individual Priority Project
Categories
1
03
£
cc
0
CA
O
|f
e tou coT3 3
'53 O
& <%
•°
O
%
1
Q
O
O
CA
PQuo§
1"3
T3
O
Cfl
jB
cd
J-73
o
CD
O
J3
S
e
D, «
pq -^
•*-
O
W)
CO
I
IH
"O cC^^ i^»6 <
0)
O
1
e
1
on
^
O
CAcd5
I(D
—
o
00
CJCO•o
,1
3
ffi
•—
O
Treatment
Control BMPs
O
Priority Projects
Commercial
Development
>1 Acre
Hillside
Development
>5,000 ft2
Parking Lots
R
R
R
R
R
R
R
R R R R
Rd)
R
S
s
s
R = Required
O = Optional/ or may be required by City Staff.
S = Select one or more applicable and appropriate treatment control BMPs.
(1) = Applies if the paved area totals >5,000 square feet or with >15 parking spaces and is potentially exposed to
urban runoff.
Project Storm Water BMP Requirement Matrix
5.2.1 Efficient Irrigation and Landscape Design
Landscape irrigation systems will be of an efficient design and installations will be maintained on a regular
and timely basis to prevent over-watering and the transport of silts, sediments, fertilizers and pesticides into the
storm drain system. Fertilizers and pesticides will be applied per manufacturer's rate to reduce the potential of
pollutant transporting.
5.2.2 Integrated Pest Management (IPM)
The use of an IPM strategy, an ecosystem-based pollution prevention strategy that focuses on long-term
prevention of pests or their damage through a combination of techniques such as biological control, habitat
manipulation, modification of cultural practices, and use of resistant plant varieties will control or eliminate
certain pollutants of concern. Pesticides are used only after monitoring indicates they are needed according to
established guidelines. Pest control materials selected and applied in a manner that minimize risks to human
health and the environment should be used. More information may be obtained at the UC Davis website
(http://www.ipm.ucdavis.edU/WATER/U/index.html). If fertilizers and pesticides are necessary, they shall be
applied per manufacturer's rates and guidelines to reduce the potential of pollutant transporting.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 12
Preliminaiy
Stonnwater Management & Maintenance Plan
El Camino Terrace
5.2.3 Outdoor Storage
There is no planned outdoor storage of any types of materials. All material storage areas are located indoors
or will be contained in an appropriate enclosure.
5.2.4 Trash Storage Areas
Trash and recycling storage areas will have concrete masonry screen wall enclosures, with gated openings.
The containers themselves are to be equipped with integral, locking lids to prevent the blowing of waste
materials. Emptying the containers on a regular and as needed basis lessens the likelihood of overflow leading to
the distribution of waste.
5.2.5 Storm Drain Signage or Stenciling
Any existing public storm drain inlets affected by project drainage, as well as all on-site private inlets, will be
stamped or stenciled (as appropriate to location) to provide notice against illegal dumping of pollutants. The
owner/developer will provide information to increase the knowledge of tenants/employees/future owner
regarding impacts of pollutants and urban runoff on receiving waters and potential BMPs for the specific land
use to affect the behavior of tenants/employees/future owner and thereby reduce pollutant releases to the
environment.
5.2.6 Spill Prevention and Control
A spill prevention and control plan applicable to site operations is to be developed and implemented by the
property owner and/or the building management. An effective plan will prevent or reduce the discharge of
pollutants due to leaks and spills. It should have spill prevention and response procedures that identify potential
spill areas, specify material handling procedures, describe spill response procedures, and provide spill clean-up
equipment. The plan should identify steps to identify and characterize potential spills, eliminate and reduce spill
potential, respond to spills when they occur, and train personnel to prevent and control future spills.
5.3 BMPs Applicable to Individual Priority Project Categories
Commercial Development >1 Acre:
a) Dock Areas. - There are no loading dock areas planned for the Project. All shipping and receiving will
be by individual, closed containers and handled on an as needed basis by each tenant and their
respective shipping company.
b) Maintenance Bays. - There are no maintenance bays associated with the Project. Any vehicular
maintenance will be performed at an off-site location.
c) Vehicle Wash Areas. - Any vehicle washing/steam cleaning is to be performed at an off-site location. If
any occurs on site, appropriate BMPs for isolation of wash wastes, such as isolating wash areas with
retention berms and appropriate disposal of wash wastes into a sewage wastewater clarifier before
entering the municipal sewer system, shall be implemented.
d) Outdoor Processing Areas. - All processing activities are contained within the buildings. No processing
allowed outdoors unless it occurs within covered or enclosed areas and discharges any drainage or
wastes into a sewage wastewater clarifier before entering the municipal sewer system.
Hillside Development >5,000 ft2:
a) Private Roads. - The design of private roadway drainage incorporates a treatment control BMP method
approved by the City Engineer to reduce storm water runoff pollution in the form of a catch basin filter
insert enabling the Project to utilize the existing drainage design of the adjacent properties.
b) Hillside Landscaping. - Hillside areas disturbed by project development will be landscaped with deep-
rooted, drought tolerant plant species selected for erosion control, in accordance with the Carlsbad
Landscape Manual.
Parking Lots:
a) Surface Parking Areas. -Surface parking areas incorporate landscape areas into the drainage design by
sheet flowing to vegetated swale buffer strips before entering the storm drain system.
5.4 Treatment Control BMPs
Landscaped areas, (indicated on Figure 5) and undisturbed natural areas can act as biofilters for irrigation and
drainage flow waters that cross over them. Mulching, seeding and planting of the landscaped areas provide
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 13
Preliiniii(ir\
Stornnrater Management & Maintenance' Plan
El Cainino Terrace
biofiltration of applied pesticides and fertilizers. Following manufacturer guidelines to avoid over treatment of
landscaping will provide a limited occurrence of pollutants in the planted areas of the Project.
The paved parking areas will receive storm water to vegetated strips located in the mid part of the parking and
along the northerly and easterly parking perimeter. The runoff received by the vegetated strip located in the mid
area of the parking will surface flow into the vegetated strip and it will then, be conveyed into a proposed catch
basin with filter insert. The rest of the parking runoff will enter into the vegetated strips along the parking
northerly and easterly parking perimeter through six-two inch cores of he curb; this runoff will flow through the
grass and then will enter into two proposed Bio-filtration systems. The filters strips function by slowing runoff
velocity and filtering out sediment and other pollutants, while also providing some infiltration into underlying
soil. The landscape plans specify the species used in planting in the strip. Recommended plantings for these
buffer areas are low growing, drought tolerant, native species. They should be hardy plants that withstand flows
and wet and dry conditions. A thick vegetative cover assures the proper filtration functioning.
The catch basin at the vegetated filter strip terminus is outfitted with catch basin filter insert (FloGard+™ by
Kristar® [or City approved equal]), filter inserts are also installed in the catch basins located west of the
building to collect the runoff from the rooftop. Installation of this type of inserts on the private drain inlets
accepting drainage from the private access drive will treat the runoff from this paved area. The inserts are
designed to collect sediment, trash, and debris during low flows (first flush); however, it will not impede peak
flow and it help to reduce the hydrocarbons, oil, grease pollutants and metal debris from vehicle brake pads.
Insert filters installed on appropriate inlets cleanse the runoff per square foot of effective filter area (per
manufacturer efficiency specs in Attachment B). The screening mechanism of the filter inserts is highly
effective in the removal of trash and debris. They will also help on the treatment of any pesticides and nutrients
emanating from the landscape areas not treated through biofiltration. The use of inserts on all appropriate inlets
will effectively aid the removal of pollutants of concern from the Project, preventing them from entering
downstream waters.
Using the flow-based aspect of the "numeric sizing criteria." the insert BMPs must be designed to mitigate
(infiltrate, filter or treat) a flow rate of 0.2 inches of rainfall per hour and relates only to water quantity.
Retention or detention of water volume/flow is not a requirement of the criteria. The flow based filter insert
sizing for the Project is as follows:
° Using the basin area formula A=Q/CI:
° A 24" catch basin (4 sq ft opening) with FloGard+™ insert can treat at least 645 GPM or 1.44 cfs
(per specifier chart).
Where Q=flowrate, 1.44 cfs, C= coefficient of runoff 0.87, 1= intensity 0.2"/hr
or A=1.44/(0.87)(.2))
Therefore, the maximum acreage draining to this catch basin could be approximately 8.57 acres.
° A 48" curb inlet (4 ft opening) with FloGard+™ insert can treat at least 1.5 cfs (per specifier chart).
Where Q=flow rate, 1.5 cfs, C= coefficient of runoff 0.87, 1= intensity 0.2"/hr
or A=1.5/(0.87)(.2))
Therefore, the maximum acreage draining to this catch basin could be approximately 8.62 acres.
o A 12"X 12" FGP-12F filter can treat 0.40 CFS (per specifier chart).
Where Q=flow rate, 0.40 cfs, C= coefficient of runoff 0.87, 1= intensity 0.2"/hr
or A=0.40/(0.87)(.2))
Therefore, the maximum acreage draining to this catch basin could be approximately 2.30 acres.
Consequently, the inlet filters meet the flow/volume criteria in the Order. Appendix B contains manufacturer
information on the capacity of the FloGard+™ inserts to treat the required volume and the Post Construction
BMP tributary area Map.
The site proposes two 8'x 4' Filterra™ Stormwater Bioretention Filtration Systems on the northeast corner of
the site. The system is well—suited for the ultra-urban environment with high removal efficiencies for pollutants
such as petroleum, heavy metals, phosphorus, nitrogen, TSS and bacteria.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 14
Preliininan'
Storniwiiti'i' Management & Maintenance Plan
El Caiiiino Terrace
The stormwater flows through a specially designed filter media mixture contained in landscaped concrete
container. The filter media captures and immobilizes pollutants; those pollutants are then decomposed,
volatilized and incorporated into biomass of Filterra™ system's micro/macro fauna and flora. Stormwater runoff
flows through the media and into an under-drain system at the bottom of the container, where the treated water
is discharged. Higher flows bypass the filterra™ via a downstream inlet structure (See Attachment B for
manufacturer specifications).
According to manufacturer's sizing table, each 8'x 4' Filterra™ Stormwater Bioretention Filtration System
for commercial areas will treat a contributing area of at least 0.36 acres to 0.44 acres.
The project tributary areas for each Filterra™ Stormwater Bioretention Filtration System are 0.35 acres and
0.21 acres; therefore, the systems will handle the contributing areas.
5.5 Summary
This project has two waterbodies identified in the 303d listing by the SWRCB. The pollutant stressors
identified as impairing those waterbodies (total dissolved solids, bacteria indicators and sedimentation/siltation)
are the primary pollutants of concern. Therefore, the remaining pollutants identified in Table 2 (nutrients, heavy
metals, organic compounds, trash & debris, oxygen demanding substances, oil & grease and pesticides) become
the secondary pollutants of concern.
With the predominant use of the site as a multi-tenant office facility with landscaped and parking areas,
production of these primary pollutants of concern is a definite possibility. By instituting an effective IPM
program, by limiting the appearance of bare soil areas through landscape maintenance and with the
implementation of source control BMPs, the production of these pollutants will be limited. The judicious use of
fertilizers and pesticides in landscaping keeps the introduction of bacteria and nutrients to a minimum. With
adequately established ground plantings to prevent soil erosion, there is a limited possibility for dissolved solids
production from eroded soils. Implementing the IPM procedures and preventing access of animal pests to both
trash receptacles and desirable environments limits the production of fecal matter considered as a main
contributor to bacterial pollution.
While infiltration basins and other infiltration methods are the most effective single treatment BMP for the
bacteria indicators and detention basins, infiltration basins, wet ponds or filtration methods identified as the
most effective for sediments their use is considered unfeasible for this project. The soil type of soil group D is
generally unsuitable for infiltration basin technologies due to low porosity and permeability. Costs associated to
modify soil infiltration capabilities is a prohibitive constraint.
Therefore, the Project utilizes a treatment train approach to the majority of storm water flows emanating from
the site. Pervious area storm water flows receive treatment from Filterra™ Stormwater Bioretention Filtration
Systems after traversing the some porous areas. Part of the Project impervious surface will surface and sheet
flow to the filter strip before entering catch basin filter insert.
The vegetated buffer strips or grassed filter strips offer treatment to storm flows from parking lot surfaces by
allowing the sheet flows to decrease velocities enabling sediments and pollutants to settle. The strips offer
medium to high removal efficiencies on these pollutants: sediment, trash, metals, oil & grease and organics.
Catch basin filter inserts will serve as a secondary Treatment Control. Per the selection matrix in Table 4
(next page), filter inserts provide a low level of removal efficiency for all pollutants, except for providing a
medium level for trash and debris. The proper use and adequate maintenance of the catch basin filter inserts
allow these effective treatment BMPs to work to their ultimate capabilities, providing adequate filtration to
remove the primary pollutants of sediments and TDS. The filtration of silts and sediment by this method will
prevent those pollutants from entering downstream waters. This proprietary BMP provides some treatment of
bacteria, while integrated pest management methods as well as indoor processing will limit the addition of
chemical and biological pollutants to downstream waters to the maximum practicable extent.
The Filterra™ Stormwater Bioretention Filtration System, per the manufacturer's specifications Table 4(next
page), can be categorized as a filtration System that provides high and medium removal efficiencies on the
primary pollutants of concern. The manufacturer's specs denote the system as having a removal rate of: 82% for
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 15
Preliminary
Stormwater Management & Maintenance Plan
El Cainino Terrace
total suspended solids (TSS), 76% for fecal coliform, 45% for nitrogen removal, 73% for phosphorus removal,
82% for heavy metals and >85% for predicted oil and grease.
TABLE 4
Pollutant of
Concern
Sediment
Nutrients
Heavy Metals
Organic
Compounds
Trash &
Debris
Oxygen
Demanding
Substances
Bacteria
Oil & Grease
Pesticides
Treatment Control BMP Categories
Biofilters
M
L
M
U
L
L
U
M
U
Detention
Basins
H
M
M
U
H
M
U
M
U
Infiltration
Basins(1)
H
M
M
U
U
M
H
U
U
Wet
Ponds or
Wetlands
H
M
H
U
U
M
U
U
U
Drainage
Inserts
L
L
L
L
M
L
L
L
L
Filtration
H
M
H
M
H
M
M
H
U
Hydrodynamic
Separator
Systems'2'
M
L
L
L
M
L
L
L
L
(1) Including trenches and porous pavement.
(2) Also known as hydrodynamic devices and baffle boxes.
L = Low removal efficiency
M = Medium removal efficiency
H = High removal efficiency
U = Unknown removal efficiency
Sources: Guidance Specifying Management Measures for Sources of Nonpoint Pollution in Coastal Waters
(1 993), National Stormwater Best Management Practices Database (2001 ), Guide for BMP Selection in
Urban Developed Areas (2001 ), and Caltrans New Technology Report (2001).
Treatment Control BMP Selection Matrix
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 16
Preliminary
Stormwater Management & Maintenance Plan
El Cainino Terrace
6.0 OPERATION AND MAINTENANCE PROGRAM
The effectiveness of any treatment or source control BMP proposed for a project relies partially on the proper
operation and maintenance of any those BMPs for the duration of the existence of that particular BMP.
Following are guidelines for the operation and maintenance of the Project source control and treatment BMPs.
By following these guidelines on a specific schedule (a schedule of BMP maintenance indicators, actions,
measurements, frequency and activities for source and treatment control BMPs is outlined in Table 5), operating
efficiency of the BMPs will be maintained.
6.1 LANDSCAPING AND IRRIGATION
The operation and maintenance needs of landscaping and irrigation are:
• Trimming of lawns and plantings in landscaped areas.
• Removal and proper disposal of landscape cuttings.
• Replacement of dead growth with new plantings.
• Monitoring flows, spray areas and spray cycles to eliminate over watering of irrigated areas, thereby
conserving water and preventing runoff.
• Fertilizer and pesticide applications as required per manufacturer's guidelines.
6.1.1 Inspection Frequency
Landscape and irrigation should be inspected at the following times:
• On a weekly basis during growing season.
• No less than bi-weekly during winter months.
• During fertilizer and pesticide applications to insure proper treatment to required areas.
6.1.2 Preventive Maintenance
Preventive maintenance activities for landscape and irrigation are:
• Planting Choices. - Use of plants specific for region and soil type.
• Inspection of Irrigation System. - Mechanical components and irrigation lines are inspected for
leakage. Repair or replace as required or if signs of wear and tear or abuse are present.
• Scheduling. - Perform mowing, pruning, fertilizing and applications of pesticides and herbicides at
optimal times of season.
• Use and Application of Fertilizers. Herbicides and Pesticides. - The application of these materials
should be in strict conformance with the manufacturer's instructions and in accordance with federal,
state and local regulations. Care should be taken not to over apply and to apply as needed as an
augment to an IPM strategy.
6.1.3 Corrective Maintenance
Corrective maintenance for landscaping and irrigation is necessary to repair malfunctions and replace poor
performing plants and components. Corrective maintenance activities include:
• Replanting. - Dicing or dead vegetation is replanted in a timely manner as soon as practicable.
Removed growth is disposed of properly.
• Irrigation Monitoring. - Irrigation cycle times are monitored and adjusted to provide water at optimum
time for sustaining plant growth. Utilization of rain sensing devices to avoid irrigating when not
needed.
• Component Replacement. - Replace broken irrigation valves and sprayheads as soon as evident. Early
replacement of defective materials prevents breakdowns of entire system.
6.1.4 Aesthetic Maintenance
Aesthetic maintenance is important for the appearance of a well maintained and a conscientiously managed
site. The following activities will be included in the aesthetic maintenance program:
• Grass Trimming. - Timely and regular trimming of grass, trees, shrubs and plantings.
Cuttings are removed and properly disposed.
• Healthy Plants. - Weeds will be removed as required through mechanical means. Plant
health will be maintained through renewing plantings as necessary.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 17
Preliminary
Stormwater Management & Maintenance Plan
El Cam'ino Terrace
6.2 INTEGRATED PEST MANAGEMENT (IPM) PROGRAM
The operation and maintenance needs of an IPM program vary as to the required degree of implementation of
the different facets of the site. The most important parts of an IPM consist of:
• Obtaining knowledge as to the available alternative, non-damaging, ecologically sound methods for
pest control. Educating the necessary personnel involved in site maintenance.
• Gathering information pertaining to the specific needs of the site dependent upon the existing regional
conditions and requirements of the site components.
• Making informed decisions based upon the knowledge gained and information gathered applicable to
the site.
6.2.1 Inspection Frequency
The IPM program inspection frequency is determined by the presence of undesirable pests. Inspections are an
important part of the IPM program to determine the effectiveness of pest management measures. Inspections
should be performed at the following times:
• Seasonally at a minimum.
• No less than bi-weekly during winter months.
• Weekly during growing season or at normally scheduled landscape maintenance work appointments.
6.2.2 Preventive Maintenance
Preventive maintenance activities for an IPM program include:
• Planting Choices. - Use of plants for their resistance to certain pests and diseases.
• Environment Manipulation. - Maintain the site environment in a nature as to be conducive to the
attraction of beneficial species that eliminate or deter undesirable/destructive species. Make the site
uninviting to detrimental or nuisance species.
• Use and Application of Fertilizers. Herbicides and Pesticides. - Utilize more environmentally friendly,
biodegradable products than traditional chemical based compounds.
• Record Keeping. - Maintain adequate records of dates, times, amounts and locations of all pesticide,
herbicide and amendment application for future reference as to effectiveness or overuse.
6.2.3 Corrective Maintenance
Corrective maintenance for an IPM strategy is necessary to recognize and correct deficiencies. Corrective
maintenance activities include:
• Recognition. - The ability to anticipate the need for application of chemical based products by
implementing IPM strategies in a timely manner.
• Timing. - Use of proper timing in fertilizer, herbicide and pesticide applications as amendments to the
ecologically beneficial IPM strategy.
• Healthy Growth. - Inserting healthy, pest free growth as a replacement is necessary insure a healthy
greenspace that is more pest resistant.
• Good Housekeeping. — Remove infected materials and dispose of properly.
6.3 MATERIAL STORAGE
The operation and maintenance needs for material storage include:
• All material storage should be indoors.
• Limiting temporary, outdoor material storage to appropriate designated areas for control of run-on and
runoff.
• Using appropriate containers for stored materials.
• General good housekeeping practices to maintain material storage facilities.
6.3.1 Inspection Frequency
Inspection of outdoor material storage areas should occur at the following times:
• On a weekly basis to discourage continued outdoor storage.
• A daily inspection of material stored outdoors during wet weather season to assure there is no possible
escape of stored materials and no possible run-on or runoff of precipitation.
• During fertilizer and pesticide applications to insure proper treatment to required areas.
6.3.2 Preventive Maintenance
Preventive maintenance activities for material storage include:
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 18
Preliininarv
Stormwater Management & Maintenance Plan
El Camino Terrace
• Designated Areas. - Use of appropriate designated areas for outdoor storage. All areas should be
completely contained by; a cabinet or shed, or covered with a roof or impenetrable barrier and
surrounded by a raised berm or dike for prevention of urban flows contacting materials.
• Containers. - Usage of appropriate, intact containers for stored materials with impermeable cover and
made of leakproof material.
• Scheduling. - Perform mowing, pruning, fertilizing and applications of pesticides and herbicides at
optimal times of season.
• Safety Data Sheets. - Maintain readily available material safety data sheets for all stored materials.
• Regulations. - Comply with all applicable regulations of zoning, building, health and fire codes
pertaining to material storage.
6.3.3 Corrective Maintenance
Corrective maintenance activities for material storage are required on an emergency or non-routine basis to
correct problems and include:
• Containment. - Having a practicable and readily deployable spill containment and clean-up procedure
identified for stored materials. Maintain presence of personnel trained in implementation of the plan.
• Container Integrity. - Repair or replace storage containers when damaged or unable to contain
materials stored within.
• Relocation. - Relocate outdoor material storage areas to an indoor location as soon as feasible.
6.3.4 Aesthetic Maintenance
Aesthetic maintenance is important for the appearance of a for material storage areas to give the appearance
of a well managed facility. The following activities will be included in the aesthetic maintenance program:
• Graffiti Removal. - Graffiti will be removed in a timely manner to improve the appearance
of a material storage areas and containers. Timely removal aids to discourage additional
graffiti or other acts of vandalism.
• Good Housekeeping. - General good housekeeping practices to maintain a neat appearance
for all material storage areas, whether inside or outside a shed or cabinet.
6.4 TRASH ENCLOSURES
The operation and maintenance needs of trash enclosures are:
• Regular removal of solid wastes and recyclable materials.
• Proper disposal techniques of allowed materials.
• Keeping enclosure gates and screens functioning.
• Good housekeeping to maintain a neat area around enclosures.
6.4.1 Inspection frequency
Trash enclosures should be inspected at the following times:
• Once a week at a minimum.
• Prior to predicted rain events to prevent trash and debris fro contaminating stormwater.
6.4.2 Preventive Maintenance
Preventive maintenance measures for trash enclosures are:
• Scheduling. - Provide frequent disposal as required to prevent wastes from overflowing containers to
surrounding areas.
• Trash and Debris. - Debris and trash shall be placed within appropriate containers to reduce the potential
for inlet structures from becoming clogged and inoperable during storm events.
• Structural Integrity. - Ensure adequate strength of construction for; enclosure structure, enclosure gates,
container, container lids/covers and pavement surfaces of surrounding areas.
• Operabilitv. - Ensure proper operability of enclosure gates and container lids/covers.
• Container. - Utilizing leakproof containers to prevent contamination of stormwater with disposed liquid
wastes.
• Sign Postings. - Signage prohibiting disposal of toxic or hazardous wastes in trash dumpsters or
recycling containers (if present).
• Regulations. - Comply with all applicable regulations of zoning, building, health and fire codes
pertaining to trash and solid waste storage and disposal.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 19
Preliminary
Stonnwater Management & Maintenance Plan
El Carnino Terrace
6.4.3 Corrective Maintenance
Corrective maintenance is required on an emergency or non-routine basis to correct deficiencies in trash
enclosures and container operations. Corrective maintenance activities include:
• Damage. - Repair damage to enclosures in a timely manner. Repair or replace defective enclosure gates
or screens and container lids or covers when damage affects operability. Repair or replace leaking
containers when leaks are evident.
• Scheduling. - Increase the frequency of collection when wastes overflow containers.
6.4.4 Aesthetic Maintenance
Aesthetic maintenance is important for clean appearance of trash enclosures. The following activity will be
included in the aesthetic maintenance program:
• Graffiti Removal. - Graffiti will be removed in a timely manner to improve the appearance of trash
enclosures, gates or containers and to discourage additional graffiti or other acts of vandalism.
• General Housekeeping. - Ensure all trash is placed in appropriate containers and lids are closed or
covers in place. Keep enclosure gates closed when containers are not being accessed.
6.5 STORM DRAIN SIGNAGE AND STENCILING
Storm drain signage operation and maintenance requirements are needed to keep information and guidance
contained thereon legible to the general public. The requirements include:
• Maintaining legibility of graphics.
• Maintain unobstructed views of signage.
6.5.1 Inspection frequency
Storm drain signage inspections should be performed at the following times:
• At least four times per year, timed to coincide with the start of seasons.
• Monthly if signage is subject to adverse conditions.
6.5.2 Preventive Maintenance
Preventive maintenance measures for storm drain signage include:
• Material Quality. - The use of high quality, durable materials have a greater tendency to last a
significantly longer time than poorer quality.
• Sizing. - Using the largest allowable signage for storm drains increase visibility and impact of message.
• Resistance to Graffiti. - Using graffiti resistant materials discourages graffiti vandalism.
6.5.2 Corrective Maintenance
Corrective maintenance is required on an emergency or non-routine basis to correct deficiencies in storm
drain signage. Corrective maintenance activities include:
• Repairs. - Repair illegible signage as required.
• Replacement. - Replace missing signage as required. Modify installation to make removal more
difficult.
6.5.3 Aesthetic Maintenance
Aesthetic maintenance is important to maintain legibility of storm drain signage. The following activity will
be included in the aesthetic maintenance program:
• Graffiti Removal. - Graffiti will be removed in a timely manner to improve the readability of signage
and to discourage additional graffiti or other acts of vandalism.
• Graphic Design. - Chose well thought out words and graphics to improve readability and
effectiveness.
6.6 CATCH BASIN FILTER INSERTS
The operation and maintenance needs of filter inserts are:
• Periodic sediment removal to optimize performance.
• Removal of trash, debris, grass trimmings, tree pruning, and leaf collection to prevent obstruction of
swales.
• Removal of standing water, which may contribute to the development of aquatic plant communities or
mosquito breeding areas.
6.6.1 Inspection Frequency
Filter inserts will be inspected at the following times:
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 20
Preliminary
Stonuwater Management & Maintenance Plan
El Camino Terrace
• No less than three inspections per year.
• After every runoff producing storm.
• On a weekly basis during extended periods of inclement weather.
6.6.2 Preventive Maintenance
Preventive maintenance activities for filter inserts are:
• Trash and Debris - Debris and trash removal shall be conducted to reduce the potential for inlet and
outlet structures and other components from becoming clogged and inoperable during storm events.
• Removal of Standing Water - Standing water must be removed if it contributes to the development of
aquatic plant communities or mosquito breeding areas.
• Use and Application of Fertilizers. Herbicides and Pesticides - The application of these materials
should be in strict conformance with the manufacturer's instructions and in accordance with federal,
state and local regulations. Care should be taken not to over-apply.
6.6.3 Corrective Maintenance
Corrective maintenance is required on an emergency or non-routine basis to correct problems and to restore
the intended operation and safe function of filter inserts. Corrective maintenance activities include:
• Removal of Debris and Sediment - Sediment, debris, and trash, which impede the hydraulic functioning
and prevent vegetative growth, shall be removed and properly disposed. Temporary arrangements
shall be made for handling the sediments until a permanent arrangement is made.
• Structural Repairs - Once deemed necessary, repairs to Grate Inlet Skimmer Box should be performed
within 10 working days.
• Adsorbent Replacement - Remove, characterize and properly dispose of spent media. Replace
adsorbent media on a yearly basis (minimum) before start of wet season.
6.7 VEGETATED FILTER STRIP
Filter strip maintenance is part of a conscientious performance of landscape maintenance. If maintained
separately, the operation and maintenance needs of filter strips are:
• Vegetation management to maintain adequate hydraulic functioning
• Animal and vector control
• Periodic sediment removal to optimize performance
• Removal of trash, debris, grass trimmings, tree pruning, and leaf collection to prevent obstruction of
strips
• Erosion and structural maintenance
6.7.1 Inspection frequency
Inspect filter strips at the following times:
• Once a month at a minimum
• After every runoff producing storm
• On a weekly basis during extended periods of inclement weather
6.7.2 Preventive Maintenance
Preventive maintenance activities for bio-filter swales are:
• Grass Mowing. - Design of the vegetation seed mix or sod within the filter strip is for it to be kept
short and thick to maintain adequate hydraulic and filtering function. Regular mowing limits the
development of faunal habitats.
• Trash and Debris. - Removal of trash and debris reduces the potential for inlet and outlet structures and
other components from becoming clogged and inoperable during storm events.
• Sediment Removal. - Monitoring of sediment accumulation is once a month during the dry season
(May 1 to September 30), after every large storm, and at least weekly during the rainy season
(October 1 to April 30). Specifically, if sediment reaches a level at or near plant height, or could
interfere with flow or operation, the sediment will be removed.
Characterization and appropriate disposal of sediment will comply with applicable local, county,
state, or federal requirements. Regrade the filter strip if the flow gradient has changed and replant
with appropriate vegetation.
• Removal of Standing Water. - No standing water should occur. If it does, remove within 72 hours of
appearance, and regrade to restore flow line.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 21
Prelinuitarv
Stormwater Management & Maintenance Plan
El Caniino Terrace
• Use and Application of Fertilizers. Herbicides and Pesticides. - The application of these materials must
be in strict conformance with the manufacturers' instructions with care taken not to over apply when
application is necessary. Use of natural or ecologically friendly materials (per the IPM) is
encouraged.
6.7.3 Corrective Maintenance
Corrective maintenance is required on an emergency or non-routine basis to correct problems and to restore
the intended operation and safe function of the filter strips. Corrective maintenance activities include:
• Removal of Debris and Sediment. - Remove and properly dispose of removed sediment, debris, and
trash that impede the hydraulic functioning and prevent vegetative growth. Temporary arrangements
for disposal may be necessary (dependant on potential contaminations that testing will divulge) until a
permanent arrangement is made. Reestablish vegetation and grade, if necessary, after sediment
removal.
• Embankment and Slope Repairs. - Once deemed necessary, damage to the embankments and slopes
upstream of swales will be repaired within 10 working days.
• Erosion Repair. - Where a reseeding program has been ineffective, or where other factors have created
erosive conditions (i.e. pedestrian traffic, concentrated flow, etc.), take corrective steps to prevent loss
of soil. Corrective actions that can be taken include; erosion control blankets, rip-rap, sodding, or
reducing flow through the affected area.
6.8 FILTERRA™ STORMWATER BIORETENTION FILTRATION SYSTEM
Maintenance
A. Each correctly installed Filterra unit is to be maintained by the Supplier, or a Supplier approved contractor
for a minimum period of 1 year. The cost of this service is to be included in the price of each Filterra unit.
Extended maintenance contracts are available at extra cost upon request.
B. Annual included maintenance consists of a maximum of (2) scheduled visits. The visits are scheduled
seasonally; the spring visit aim to clean up after winter loads that may include salts and sands. The fall visit
helps the system by removing excessive leaf litter.
C. Each Included Maintenance visit consists of the following tasks.
1. Filterra unit inspection
2. Foreign debris, silt, mulch & trash removal
3. Filter media evaluation and recharge as necessary
4. Plant health evaluation and pruning or replacement as necessary
5. Replacement of mulch
6. Disposal of all maintenance refuse items
7. Maintenance records updated and stored (reports available upon request)
D. The beginning and ending date of Supplier's obligation to maintain the installed system shall be determined
by the Supplier at the time the system is activated. Owners must promptly notify the Supplier of any
damage to the plant(s), which constitute(s) an integral part to the bioretention technology.
6.9 HYDROSEEDING *
The operation and maintenance needs of hydroseeding are: (* - Hydroseeding only required if site not built
upon for more than 30 days.)
• Vegetation management to maintain levels of vegetative cover acceptable to the City.
• Animal and vector control.
• Periodic sediment removal to optimize performance.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 22
Preliminary
Stonnwater Management & Maintenance Plan
El Camino Terrace
• Removal of trash, debris, grass trimmings, tree pruning, and leaf collection to prevent an appearance of
neglect.
6.9.1 Inspection frequency
Hydroseeding should be inspected at the following times:
• Once a month at a minimum.
• After every runoff producing storm.
• On a weekly basis during extended periods of inclement weather.
6.9.2 Preventive Maintenance
Preventive maintenance activities for hydroseeding are:
• Grass Mowing. - Vegetation height will be maintained to a height designated by the City.
• Irrigation. - Design of the vegetation seed mix within the hydroseeded area is a native type mix and
requires no irrigation after adequate plant establishment.
• Trash and Debris. - Debris and trash removal reduces the potential for storm water inlets becoming
clogged and inoperable during storm events.
• Removal of Standing Water. - Remove standing water if present within 72 hours of a storm event to
prevent the development of aquatic plant communities or mosquito breeding areas.
• Use and Application of Fertilizers. Herbicides and Pesticides. - The native mix requires no applications
of these materials.
6.9.3 Corrective Maintenance
Corrective maintenance is required on an emergency or non-routine basis to correct problems and to restore
the function of the hydroseeded area. Corrective maintenance activities include:
• Removal of Debris and Sediment. - Remove and properly dispose of sediment, debris, and trash as
required. Vegetation shall be re-established after sediment removal.
• Structural Repairs. - Once deemed necessary, perform repairs to hydroseeded areas within 10 working
days.
• Erosion Repair. - Where a reseeding program has been ineffective, or where other factors have created
erosive conditions (i.e. pedestrian traffic, concentrated flow, etc.), corrective steps shall be taken to
prevent loss of soil and any subsequent danger to the performance of the downstream BMPs, drainage
systems and watershed. Methods to limit erosion include; erosion control blankets, rip-rap, sodding, or
reduced flow through the affected area.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 23
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TABLE 5
Permanent BMP Maintenance Program
A schedule of periodic maintenance should be implemented and modified, as needed, to insure effective operation of the indicated permanent site design, source control and treatment BMPs. As a guideline, a
tentative schedule of maintenance frequency follows. The schedule is based on certain indicators outlined for a particular BMP.
BMP
Vegetated Filter Strips
Hydroseeding*
* - Hydroseeding only
necessary if site not
built upon for 30 days.
Catch Basin t Filter
Insert
Landscaping &
Irrigation
ROUTINE ACTIONS
Height of vegetation.
Assess adequate cover.
Inspect for debris accumulation.
Inspect for accumulation of sediment or
erosion of soil.
Sediment removal.
Trash and debris removal.
Oil and grease removal.
Structural integrity of insert.
Annual renewal of adsorbent medium.
Inspect for overgrown plantings.
Inspect for dead or dicing plants.
Inspect for over irrigation.
Inspect for over application of
fertilizers or pesticides.
MAINTENANCE INDICATORS
Average height of vegetation (grass)
exceeds 4".
Bare spots appear in planted/mulched
areas or less than 70% coverage over
entire area.
Debris or litter accumulation.
Sediment is at or near vegetation height.
Rills or gullies in topsoil.
Sediment more than Vi height of filter
body.
Sufficient trash or debris accumulation
to hinder filter performance.
Absorbent medium dark gray or darker
and saturated with oil.
Broken or damaged insert with visible
rips, tears, gashes and /or fallen media.
End of wet season.
Grass longer than 2". Bushes and shrubs
growing into traveled ways. Trees
overhanging and interfering with users
of walkways, parking spaces or drive
aisles.
Indicators vary as to species, but
generally are unhealthy looking growth.
Browning, drooping branches and
leaves.
Oversaturated ground. Standing water
in low spots. Excess run-off of irrigation
waters.
Indicators vary as to materials, but
generally are burned spots for excessive
fertilizer use and sticky residue or
staining for over use of pesticides.
FIELD MEASUREMENT
Visual inspection of vegetation.
Visual inspection of lack of
vegetative/mulch cover. Record locations
to identify persistent problem areas.
Visual inspection for trash.
Visual inspection for sediment depth.
Visual inspection for rills and soil erosion.
Visual inspection of filter body.
Visual inspection of inlet and filter insert.
Visual inspection of adsorbent filter
media.
Visual inspection of insert components.
Lack of precipitation for extended period.
Visual observation for indicators when
landscaping maintenance performed.
Visual observation for indicators.
Visual observation for indicators.
Visual observation for indicators.
FREQUENCY
Inspect weekly and after rainy
periods.
Assess growth on a monthly basis.
Assess mulch coverage on a monthly
basis.
During routine site landscape
maintenance.
Inspect monthly and after each
significant rainfall.
After each rain event.
After each rain event.
After each Target 2 (0.75") rain
event.
Semi-annually, May and October.
Annually before wet season.
Weekly during growing season.
Bi-weekly during winter months.
Weekly during growing season.
Bi-weekly during winter months.
Weekly during growing season.
Bi-weekly during winter months.
Weekly during growing season.
Bi-weekly during winter months.
MAINTENANCE ACTIVITY
Cut vegetation as required.
Reseed vegetated areas as required. No
later than November. Scarify area for
reseeding. Reapply mulching as required to
cover bare spots.
Remove and properly dispose of trash,
litter and debris.
Remove accumulated sediment when
interfering with drainage flows.
Remove and properly dispose of sediment.
Remove and properly dispose of brash and
debris accumulation.
Replace adsorbent media within 10
working days. Characterize and properly
dispose of spent media prior to wet season.
Replace insert. Contact vendor to develop
preventative procedures. Effect repairs
within 10 working days.
Remove, characterize and properly dispose
of spent media. Replace adsorbent media
before start of wet season.
Cut and trim overgrowth as required.
Remove and replace dead or dieing
plantings.
Adjust timing mechanism for automatic
sprinklers. Increase timing between
applications. Consider more frequent,
shorter operation periods.
Adjust amounts of materials applied.
Consider Integrated Pest Management
alternatives.
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(Continued)
BMP
Integrated Pest
Management
Material Storage
Trash Enclosures
Storm Drain Signage
Stormwater
Bioretention Filtration
ROUTINE ACTIONS
Inspect for evidence of undesirable
plant species.
Inspect for evidence of undesirable
insect species.
Inspect for evidence of undesirable
vertebrate species.
Inspect for outdoor storage of materials.
Inspect containers for overflowing trash
and debris.
Inspect for open containers or
enclosures.
Inspect storm drain stencils, signs or
placards.
Inspect for evidence of undesirable
plant species.
Inspect for evidence of influent pipe
obstructions.
Inspect skimmers for evidence of
damaged components.
Inspect for filter sack for clogging and
structural integrity.
Inspect for sediment accumulation.
MAINTENANCE INDICATORS
Presence of non-native plants or growth,
especially in unwanted areas.
Presence of non-native or harmful
insects. Plant growth destruction.
Presence of undesirable animals. Plant
growth destruction. Animal scratches on
trash dumpsters. Footprints in wet earth,
trampled plantings.
Uncovered, unprotected materials stored
on the ground.
Trash and debris on ground in area
surrounding trash dumpster.
Gates of enclosures and lids of
containers are open.
Deteriorating or missing signage.
Presence of non-native plants or growth,
in wetland planting areas.
Presence of debris in pipe or reduced
inflow volume.
Weakened or damaged components,
hoses, pipes or connections.
FIELD MEASUREMENT
Visual observation for indicators.
Visual observation for indicators.
Visual observation for indicators.
Olf active presence of animal territory
markings.
Visual observation for presence of
material storage.
Visual observation for trash and debris on
ground.
Visual observation for open gates and
lids.
Visual observation for illegibility or
missing signage.
Visual observation for indicators.
Visual observation for indicators.
Standing water in upstream components.
Visual observation for indicators. Tactile
testing for structural integrity.
Measurement of depth of build-up.
Sediment contained within effluent from
discharge pipe.
FREQUENCY
Seasonally at the minimum. Weekly
during growing season.
Seasonally at the minimum. Weekly
during growing season.
Weekly during growing season.
Seasonally at the minimum.
Weekly inspections for presence of
stored materials. Daily inspections
for stored materials.
Weekly inspections at a minimum
and prior to predicted rain event.
Daily inspections to prevent blowing
of trash and debris and to discourage
pest activity.
Seasonal observations of signage.
More frequently if signage is located
high traffic areas or subject to
adverse conditions.
Seasonally at the minimum.
Two scheduled visits in spring and
after winter.
MAINTENANCE ACTIVITY
Remove unwanted species. Replace with
native types.
Manage unwanted insects with predatory
species or plantings that discourage pest
presence. Pesticide use as a last alternative.
Manage unwanted animals by eliminating
desirable environs. Use of humane traps for
relocation. Use poisons as a last alternative.
Place materials in designated area in shed
or cabinet. Bermed area with roof or
impermeable cover may also be used.
Place trash and debris in appropriate
container.
Close open gates or lids. Install locks for
access by authorized personnel only.
Repair illegible signage.
Replace missing signage.
Remove unwanted species.
Clear debris from upstream inlet openings
and influent pipe.
Repair or replace, as necessary, broken
components, hoses, pipes or loose
connections.
Empty and clean filter as needed.
Remove sediment accumulation with
vacuum truck or septic tank cleaner.
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Preliniinaiy
Stormwater Management & Maintenance Plan
El Cainiiw Terrace
7.0 EDUCATION AND OUTREACH
The CC&R document accompanying the condominium plan will specify that the owner's association will be
required to provide or designate a qualified individual or agency to provide training and information. The
owner's association, on an as needed basis, will provide information regarding BMPs for utilization by anyone
performing activities on the site that could impact runoff. This education and training increases the knowledge
of tenants, employers and employees regarding the impacts of pollutants and urban runoff on receiving waters.
Performing this education and training informs the tenants, employers and employees as to their responsibilities
in preventing and reducing pollutant releases to the environment.
The owner's association will be notified of its responsibilities pertaining to the BMPs set-forth in this
document, as regulated by the City of Carlsbad Municipal Code, Title 15, Chapter 15.12 and all underlying
codes cited therein. Additionally, the owner's association will be advised about the responsibility for reporting
illicit discharge and shall be provided with the City of Carlsbad clean water telephone hotline: (760) 602-2799).
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 26
Preliminary
Stormwater Management & Maintenance Plan
El Camilla Terrace
8.0 FISCAL RESOURCES
The owner of the El Camino Terrace project will be financially responsible for the construction, installation
and maintenance of the post development BMPs. The verification mechanism used by the City to assure
maintenance will include the project proponent's signed statement, as part of the project application, accepting
responsibility for all permanent BMP maintenance, repair and replacement. The owner is also required to
implement the SWMP, until the recording of the Conditions, Covenants and Restrictions (CC&R) document
with the condominium plan at the County Recorder's office establishing the owner's association. All
maintenance of the permanent, private onsite source control and treatment BMPs, including filter inserts
(FloGardn-®) and the Filterra™ Stormwater Bioretention Filtration Systems, will be owner's association
responsibility.
Most of the permanent BMPs accrue minimal maintenance costs. Mulching, seeding and plantings are part of
a continuing landscape maintenance program. Encompassed within the performance of landscaping maintenance
is the maintenance of irrigation system and the filter strip. The CC&R document will specify responsibilities of
landscaping maintenance for permanent stabilization of graded areas.
A maintenance contract entered into with both the FloGard+® and Filterra™ providers upon installation will
insure a continued monitoring of the catch basin filter inserts and the Stormwater Bioretention Filtration System,
respectfully, installed as part of the Project. The contract(s) will provide for necessary maintenance and needed
repairs to maintain effectiveness of both proprietary BMPs for the length of the contract(s).
The permanent responsibility of the post-development BMPs remains with the property by the use of
restrictive deed language and the CC&R document. The deed language and CC&R document will place the
responsibility for all future maintenance upon the owner of record.
The installation and maintenance of the post-development BMPs is the responsibility of the owner's
association. The City may enter into a Permanent Storm Water Quality Best Management Practices Maintenance
Agreement (Agreement) with the project proponent or owner's association obliging that the storm water BMPs
are maintained, repaired and replaced as necessary throughout the "use" of the project site, satisfactory to the
City Engineer or into perpetuity. The Agreement shall include a provision that gives the City the right, but not
the obligation to perform the maintenance. The party responsible for BMP maintenance will pay the City for
costs incurred by the City for maintaining any BMP's covered by the Agreement. The Agreement will provide a
cost recovery provision in favor of the City satisfactory to the City Attorney. Security may be required in
support of the Agreement to equal the cost of maintenance activities for an amount and time period determined
by the City. The Agreement becomes part of the project's construction permit before City grants approval of the
permit.
The Agreement includes an Operation and Maintenance (O&M) Plan approved by the City. The O&M Plan
describes the designated responsible party to manage the storm water BMP(s), employee's training program and
duties, operating schedule, maintenance frequency, routine service schedule, specific maintenance activities
(including maintenance of storm water conveyance system signage), copies of resource agency permits, and any
other activities necessary to maintain the permanent source control and treatment BMPs.
The Agreement may also include an Access Easement/Agreement, executed and recorded, that is binding on
the underlying land throughout the life of the project in favor of the party responsible for maintenance. The
easement is in effect for the life of the particular BMP requiring access for maintenance until such time that
removal or replacement of the permanent treatment BMP occurs rendering that access unnecessary.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 27
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TABLE 6
PERMANENT TREATMENT BMP
ESTIMATED OPERATION AND MAINTENANCE (O&M) COSTS
Permanent treatment BMPs, either existing or constructed and installed for this project, will necessitate continuous operation and maintenance (O&M) when the project is complete. O&M costs are based upon California Department
of Transportation estimated costs for the pilot BMP project utilizing prevailing wage rates. Below are estimated itemized costs, based upon the pilot BMP project, manufacturer information and knowledge obtained from prior completed
projects, of this project's permanent treatment BMPs as shown in Figure 5.As identified in WQTR Section 8.0, Fiscal Resources, the source for funding of BMP operation and maintenance is the responsibility of the property
owner/developer or designated association.Post construction permanent BMP operation and maintenance costs include, but are not limited to the following:
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BMP OPERATION & MAINTENANCE ITEM
FILTER INSERTS (Qty 4)
FILTERRA BIORETENTION (Qty2)
FILTRATION SYSTEM
LANDSCAPING & IRRIGATION
LABOR
Per Mrs.
12.0
10.0
96.0
Rate
43.63
43.63
43.63
Cost
$523.56
$436.30
$4,188.48
EQUIPMENT
Type
1 Jon Truck
1 Ton Truck
Hydroseeder, 1 Ton
Truck
Days
1.5
1.5
6.0
Rate
26.84
26.84
48.15
Cost
$40.26
$40.26
$288.90
MATERIALS
Item
New Adsorbent,
Testing &
Disposal
Trimmer, Rake,
Fork, Bags,
Safety
Equipment,
Bags, Testing &
Disposal
Trimmer, Rake,
Fork, Bags,
Safety
Equipment,
Bags, Seed,
Testing &
Disposal
Cost
$800.00
$600.00
$550.00
O&M
TOTAL
TOTAL COST
$1,363.82
$1,076.56
$5,027.38
$7,467.76
BMP OPERATION & MAINTENANCE ITEM
HYDROSEEDING*
LABOR
Per Mrs.
52.0
Rate
43.63
Cost
$2,268.76
EQUIPMENT
Type
1 Ton Truck,
Hydroseeder
Days
12.0
Rate
48.15
Cost
$577.80
MATERIALS
Item
Seed, Binder
* Only Required if Site not Constructed 30 Days after Grading.
Cost
$400.00
O&M
TOTAL
TOTAL COST
$3,246.56
$3,246.56
28
Preliminary
Stormwater Management & Maintenance Plan
El Camilla Terrace
9.0 CONCLUSION
This SWMP has been prepared to define potential Best Management Practices (BMPs) that satisfy the
requirements identified in the following documents:
1) City of Carlsbad "Standard Urban Storm Water Mitigation Plan, Storm Water Standards" dated April
2003.
2) Standard Specifications for Public Works Construction, current edition.
3) National Pollution Discharge Elimination System (NPDES) General Permit for Storm Water
Discharges Associated with Construction Activity (General Permit), issued by the State Water
Resources Control Board, Water Quality Order 99-08 DWQ.
4) San Diego NPDES Municipal Storm Water Permit (Order Number 2007-01).
Thus, it has been shown that this project can meet the water quality objectives as outlined in Order 2007-01 as
proposed and shown on the site plan. An analysis has been performed to ensure that the site plan can
accommodate the water quality BMPs. Therefore, it is anticipated that the site plan will not affect downstream
waters by the implementation of these BMPs.
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 29
Preliminary
Stonnwater Management & Maintenance Plan
El Camino Terrace
10.0 CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate
the information submitted.
Based on my inquiry of the person and persons who manage the system, or those persons directly responsible
for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate
and complete. I am aware that there are significant penalties for submitting false information, including the
possibility of fine and imprisonment for knowing violations.
This Storm Water Management Plan has been prepared to comply with the requirements of the "City of
Carlsbad, Standard Urban Storm Water Mitigation Plan, Storm Water Standards Manual" in effect as of the date
of this report.
Ka 619296-5565
Name and Title Telephone Number
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 30
Preliminary
Stonnwater Management & Maintenance Plan
El Camlno Terrace
ATTACHMENTS
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04 31
ATTACHMENT A
HYDROLOGY STUDY
K&S K&S ENGINEERING
Planning Engineering Surveying
PRELIMINARY
HYDROLOGY STUDY
FOR:
EL CAMINO TERRACE
PARCEL 3 OF PARCEL MAP No. 18059
CARLSBAD, CA
CT 06-17, SDP 06-07, PUD 06-15 & SUP 06-04
Prepared By:
K&S Engineering
7801 Mission Center Court, Suite 100
San Diego, CA 92108
Prepared For:
Tycoon Development Corporation
2371 Fenton Street
Chula Vista, CA 91914
July 26,2006
Revised July 23,2007
K&S Job No 05-062
DATE
7801 Mission Center Court, Suite 100 • San Diego, California 92108 • (619)296-5565 • Fax (619) 296-5564
TABLE OF CONTENTS
1. HYDROLOGY DESIGN MODELS
2. VICINITY MAP
3. INTRODUCTION
4. HYDROLOGIC CALCULATIONS APPENDIX A
5. CAPACITY CALCULATION FOR EXISTING 12" PVC APPENDIX B
6. TABLES AND CHARTS APPENDIX C
7. HYDROLOGY MAP APPENDIX D
8. REFERENCE MATERIAL APPENDIX E
1. HYDROLOGY DESIGN MODELS
A. DESIGN METHODS
THE RATIONAL METHOD IS USED IN THIS HYDROLOGY STUDY; THE RATIONAL FORMULA
IS AS FOLLOWS:
Q = CIA, WHERE : Q= PEAK DISCHARGE IN CUBIC FEET/SECOND *
C = RUNOFF COEFFICIENT (DIMENSIONLESS)
I = RAINFALL INTENSITY IN INCHES/HOUR
A = TRIBUTARY DRAINAGE AREA IN ACRES
*1 ACRE INCHES/HOUR = 1.008 CUBIC FEET/SEC
THE OVERLAND METHOD IS ALSO USED IN THIS HYDROLOGY STUDY;
THE URBAN AREAS OVERLAND FORMULA IS AS FOLLOWS:
T=[ 1 . ( 5) 333
L = LENGTH OF WATERSHED
C = COEFFICIENT OF RUNOFF
T = TIME IN MINUTES
S = DIFFERENCE IN ELEVATION DIVIDED BY DE LENGTH OF WATERSHED
B. DESIGN CRITERIA
- FREQUENCY, 100 YEAR STORM.
- LAND USE PER SPECIFIC PLAN AND TENTATIVE MAP.
- RAIN FALL INTENSITY PER COUNTY OF SAN DIEGO 2003, HYDROLOGY DESIGN
MANUAL.
C. REFERENCES
- COUNTY OF SAN DIEGO 2003, HYDROLOGY MANUAL.
- COUNTY OF SAN DIEGO 1992 REGIONAL STANDARD DRAWING.
- HAND BOOK OF HYDRAULICS BY BRATER & KING, SIXTH EDITION.
I
I
I
I
2. VICINITY MAP
0.4 1.2 1.6 2 »i
MI: 13.14
G=-0.156
3. INTRODUCTION
A. EXISTING CONDITION
THE EXISTING SITE CONSISTS OF ONE VACANT COMMERCIAL LOT ON THE
SOUTHEAST CORNER OF THE EL CAMINO REAL & COUGAR DRIVE
INTERSECTION IN THE CITY OF CARLSBAD (PARCEL 3 AS SHOWN ON
PARCEL MAP NO. 18059). THE LOT IS PARTIALLY GRADED WITH AN AC
DRIVEWAY THAT RUNS NORTH TO SOUTH ALONG THE EAST SIDE.
MOST OF THE LOT AREA (0.93 ACRES) CURRENTLY DRAINS TOWARDS AN
EXISTING AND TEMPORARY 12" PVC PIPE WITH WEEPHOLES TO CAPTURE
THE RUNOFF PRODUCED LOCATED ON THE NORTHEAST AREA,
GENERATING A RUNOFF AT THIS POINT OF Q100= 2.06 C.F.S.. THE EXISTING
AC DRIVEWAY AND SOME SLOPE AREA (0.18 ACRES) DRAIN TOWARDS AN
EXISTING CURB INLET LOCATED ON THE MID-EASTERLY AREA OF THE
LOT, GENERATING Q100= 0.45 C.F.S.. THE REST OF THE UNDEVELOPED LOT
DRAINS TOWARDS BOTH STREETS EL CAMINO REAL AND COUGAR DRIVE,
THE SUPERFICIAL RUNOFF FOR THIS AREA IS A TOTAL OF Q100= 0.54 C.F.S.
B. PROPOSED CONDITION
THE PROPOSED DEVELOPMENT CONSISTS OF THE CONSTRUCTION OF ONE
COMMERCIAL BUILDING WITH DRIVE AISLE AND PARKING.
STORM RUNOFF WILL BE COLLECTED BY PRIVATE INLETS AND PRIVATE
STORM DRAIN PIPES. THE PRIVATE STORM DRAIN SYSTEM WILL BE
CONNECTED TO THE EXISTING STORM DRAIN SYSTEM LOCATED WITHIN
THE NORTHEAST AREA OF THE SITE.
MOST OF THE SITE AREA DRAINS TOWARDS A TYPE "F' CATCH BASIN AND
TWO PROPOSED STORMWATER BIORETENTION FILTRATION SYSTEM TO
MITIGATE WATER QUALITY IMPACTS LOCATED AT THE NORTHEAST
CORNER OF THE DEVELOPMENT; THEN, IT CONNECTS TO THE EXISTING 12"
PVC PIPE; AT THIS POINT THE PROPOSED CONDITION WILL GENERATE A
RUN-OFF OF 4.82 C.F.S.
THE PROPOSED DRIVEWAY/PARKING AREA (SOUTH EAST AREA) DRAINS
TOWARDS THE EXISTING CURB INLET LOCATED AT THE MID-EASTERLY
POINT OF THE SITE , THE PROPOSED CONDITION RUNOFF AT THIS POINT IS
0.98 C.F.S.
THE REST OF THE SITE WILL DRAIN TOWARDS BOTH STREETS EL CAMINO
REAL AND COUGAR DRIVE, THE SUPERFICIAL RUNOFF FOR THIS AREA IS A
TOTAL OF Q100= 1.11 C.F.S.
C. STORM WATER QUALITY
** TO ADDRESS WATER QUALITY FOR THE PROJECT, BMPS WILL BE
IMPLEMENTED DURING CONSTRUCTION AND POST CONSTRUCTION PHASES. PER
SECTION H, TABLE 1 OF THE STANDARDS, THE PROJECT IS BEST DESCRIBED AS
" BELONGING TO THE PARKING LOT CATEGORY.
"" AS A PRIORITY PROJECT, THIS CATEGORY REQUIRES APPROPRIATE BMPS FROM
• THE APPLICABLE CATEGORIES BELOW OR EQUIVALENTS AS IDENTIFIED IN
APPENDIX C OF THE STANDARDS:
WffC
• SITE DESIGN BMP'S
" • SOURCE CONTROL BMP'S
*» • BMPS APPLICABLE TO SPECIFIC CATEGORIES:
1. PRIVATE ROADS
2. SURFACE PARKING AREAS
- 3. HILLSIDE LANDSCAPE
m • TREATMENT CONTROL BMP'S
— THE PROPOSED TREATMENT CONTROL BMP'S THAT THE PROJECT
m INCLUDES ARE: VEGETATES STRIPS, CATCH BASIN FILTER INSERTS AND A
MANUFACTURED WETLAND SYSTEM.
«, FOR MORE DETAILS ON STORM WATER QUALITY FOR THE PROPOSED SITE,
PLEASE REFER TO THE STORM WATER MANAGEMENT AND STORM WATER
* MAINTENANCE PLAN.
D. SUMMARY
THERE IS AN INCREASE IN RUNOFF FROM THE EXISTING TO THE PROPOSED
CONDITION OF 3.86 C.F.S., THIS IS DUE SOLELY TO INCREASING THE "C"
VALUE FROM A MASS GRADED SITE TO COMMERCIAL DEVELOPMENT.
THE INCREASE OF RUNOFF WILL NOT HAVE ANY NEGATIVE IMPACT SINCE
THE EXISTING IMPROVEMENTS WERE DESIGNED TO HANDLE THE
ULTIMATE FLOW FOR THE PROPOSED ZONING, SEE PRELIMINARY
HYDROLOGY STUDY PREPARED BY PACIFIC LAND SURVEYING, DATED
OCTOBER 8, 1996 (APPENDIX D.), THIS STUDY SHOWS A DEVELOPED
RUNOFF OF Q100= 5.58 C.F.S., THE PROPOSED RUNOFF CONVEYED INTO THE
EXISTING 12" PVC PIPE GENERATED BY THE CONSTRUCTION OF THE EL
CAMINO TERRACE PROJECT IS Q100= 4.82 CFS; FUTHERMORE MANNING'S
CALCULATIONS ARE PROVIDED IN THIS REPORT TO CHECK THE CAPACITY
OF SAID PIPE (SEE APENDDC B.)
APPENDIX A
(4. HYDROLOGIC CALCULATIONS)
EXISTING CONDITION
EXISTING CONDITION HYDROLOGY
100 YEAR STORM
EL CAMINO TERRACE J.N. 05-062
San Diego County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1991-2004 Version 7.4
Rational method hydrology program based on
San Diego County Flood Control Division 2003 hydrology manual
Rational Hydrology Study Date: 04/12/07
********* Hydrology Study Control Information **********
Program License Serial Number 4035
Rational hydrology study storm event year is 100.0
English (in-lb) input data Units used
Map data precipitation entered:
6 hour, precipitation(inches) = 2.700
24 hour precipitation(inches) = 4.800
P6/P24= 56.3%
San Diego hydrology manual 'C' values used
Process from Point/Station 1.000 to Point/Station 2.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
Impervious value, Ai = 0.100
Sub-Area C Value = 0.410
Initial subarea total flow distance = 163.000(Ft.)
Highest elevation = 271.000(Ft.)
Lowest elevation = 264.000(Ft.)
Elevation difference = 7.000(Ft.) Slope = 4.294%
INITIAL AREA TIME OF CONCENTRATION CALCULATIONS:
Initial Area Time of Concentration = 7.64 minutes
TC = [1.8*(l.l-C)*distance(Ft.)A.5)/(% slopeA(l/3)]
TC = [1.8*(l.l-0.4100)*(100.000A.5)/( 4.294A(l/3)]= 7.64
Rainfall intensity (I) = 5.411 (In/Hr) for a 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.410
Subarea runoff = 2.063(CFS)
Total initial stream area = 0.930(Ac.)
Process from Point/Station 3.000 to Point/Station 4.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
Impervious value, Ai = 0.100
Sub-Area C Value = 0.410
Initial subarea total flow distance = 124.000(Ft.)
Highest elevation = 265.000(Ft.)
Lowest elevation = 256.000(Ft.)
Pipe flow velocity = 3.78(Ft/s)
Travel time through pipe = 0.35 min.
Time of concentration (TC) = 5.35 min.
Process from Point/Station 2.000 to Point/Station 3.000
**** SUBAREA FLOW ADDITION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Time of concentration = 5.35 min.
Rainfall intensity = 6.808(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA = 0. 1 62
Subarea runoff = 0.253(CFS) for 0.050(Ac.)
Total runoff = 1 .099(CFS)Total area = 0.190(Ac.)
Process from Point/Station 3.000 to Point/Station 4.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 266.700(Ft.)
Downstream point/station elevation = 264.300(Ft.)
Pipe length = 80.00(Ft.) Manning's N = 0.01 3
No. of pipes = 1 Required pipe flow = 1.099(CFS)
Given pipe size = 8.00(In.)
Calculated individual pipe flow = 1.099(CFS)
Normal flow depth in pipe = 4. 1 2(In.)
Flow top width inside pipe = 8.00(In.)
Critical Depth = 5.97(In.)
Pipe flow velocity = 6.07(Ft/s)
Travel time through pipe = 0.22 min.
Time of concentration (TC) = 5.57 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-H-++++++++++
Process from Point/Station 4.000 to Point/Station 5.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 264.300(Ft.)
Downstream point/station elevation = 263.770(Ft.)
Pipe length = 54.70(Ft.) Manning's N = 0.0 13
No. of pipes = 1 Required pipe flow = 1.099(CFS)
Given pipe size = 8.00(In.)
Calculated individual pipe flow = 1.099(CFS)
Normal flow depth in pipe = 6.07(In.)
Flow top width inside pipe = 6.85(In.)
Critical Depth = 5.97(In.)
Pipe flow velocity = 3.87(Ft/s)
Travel time through pipe = 0.24 min.
Time of concentration (TC) = 5.81 min.
Process from Point/Station 4.000 to Point/Station 5.000
Elevation difference = 9.000(Ft.) Slope = 7.258 %
Top of Initial Area Slope adjusted by User to 7.660 %
INITIAL AREA TIME OF CONCENTRATION CALCULATIONS:
Initial Area Time of Concentration = 6.30 minutes
TC = [1.8*(l.l-C)*distance(Ft.)A.5)/(% slopeA(l/3)]
TC = [1.8*(l.l-0.4100)*(100.000A.5)/( 7.660A(l/3)]= 6.30
Rainfall intensity (I) = 6.128(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.410
Subarea runoff = 0.452(CFS)
Total initial stream area = 0.180(Ac.)
Process from Point/Station 5.000 to Point/Station 6.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
Impervious value, Ai = 0.100
Sub-Area C Value = 0.410
Initial subarea total flow distance = 153.000(Ft.)
Highest elevation = 284.000(Ft.)
Lowest elevation = 275.000(Ft.)
Elevation difference = 9.000(Ft.) Slope = 5.882%
INITIAL AREA TIME OF CONCENTRATION CALCULATIONS:
Initial Area Time of Concentration = 6.88 minutes
TC = [1.8*(l.l-C)*distance(Ft.)A.5)/(% slopeA(l/3)]
TC = [1.8*(l.l-0.4100)*(100.000A.5)/( 5.880A(l/3)]= 6.88
Rainfall intensity (I) = 5.790(In/Hr) fora 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.410
Subarea runoff = 0.190(CFS)
Total initial stream area = 0.080(Ac.)
Process from Point/Station 7.000 to Point/Station 8.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
Impervious value, Ai = 0.100
Sub-Area C Value = 0.410
Initial subarea total flow distance = 190.000(Ft.)
Highest elevation = 265.000(Ft.)
Lowest elevation = 250.600(Ft.)
Elevation difference = 14.400(Ft.) Slope = 7.579%
INITIAL AREA TIME OF CONCENTRATION CALCULATIONS:
Initial Area Time of Concentration = 6.32 minutes
TC = [1.8*(l.l-C)*distance(Ft.)A.5)/(% slopeA(l/3)]
TC = [1.8*(l.l-0.4100)*(100.000A.5)/( 7.580A(l/3)]= 6.32
Rainfall intensity (I) = 6.114(In/Hr) fora 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.410
Subarea runoff = 0.351 (CFS)
Total initial stream area = 0.140(Ac.)
End of computations, total study area = 1.330 (Ac.)
PROPOSED CONDITION
PROPOSED CONDITION HYDROLOGY
100 YEAR STORM
EL CAMINO TERRACE J.N. 05-062
San Diego County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1991-2004 Version 7.4
Rational method hydrology program based on
San Diego County Flood Control Division 2003 hydrology manual
Rational Hydrology Study Date: 08/02/07
********* Hydrology Study Control Information **********
Program License Serial Number 4035
Rational hydrology study storm event year is 100.0
English (in-lb) input data Units used
Map data precipitation entered:
6 hour, precipitation(inches) = 2.700
24 hour precipitation(inches) = 4.800
P6/P24 = 56.3%
San Diego hydrology manual 'C values used
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++4
Process from Point/Station 1.000 to Point/Station 2.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Initial subarea total flow distance = 78.000(Ft.)
Highest elevation = 272.170(Ft.)
Lowest elevation = 269.800(Ft.)
Elevation difference = 2.370(Ft.) Slope = 3.038 %
USER ENTRY OF INITIAL AREA TIME OF CONCENTRATION
Time of Concentration = 5.00 minutes
Rainfall intensity (I) = 7.114(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.850
Subarea runoff = 0.847(CFS)
Total initial stream area = 0.140(Ac.)
Process from Point/Station 2.000 to Point/Station 3.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 267.520(Ft.)
Downstream point/station elevation = 266.700(Ft.)
Pipe length = 80.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 0.847(CFS)
Given pipe size = 8.00(In.)
Calculated individual pipe flow = 0.847(CFS)
Normal flow depth in pipe = 4.89(In.)
Flow top width inside pipe = 7.80(In.)
Critical Depth = 5.23(In.)
**** SUBAREA FLOW ADDITION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
The area added to the existing stream causes a
a lower flow rate of Q = 1.099(CFS)
therefore the upstream flow rate of Q = 1.099(CFS) is being used
Time of concentration = 5.80min.
Rainfall intensity = 6.463(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 C A = 0.170
Subarea runoff = O.OOO(CFS) for 0.010(Ac.)
Total runoff = 1.099(CFS)Total area = 0.200(Ac.)
+++++++++++++++++++++++++++++++++++++++++-H-+++++++++++++++++++++++++++
Process from Point/Station 5.000 to Point/Station 6.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 263.770(Ft.)
Downstream point/station elevation = 262.900(Ft.)
Pipe length = 85.00(Ft.) Manning's N = 0.013
No. of pipes =1 Required pipe flow = 1.099(CFS)
Given pipe size = 10.00(In.)
Calculated individual pipe flow = 1.099(CFS)
Normal flow depth in pipe = 4.97(In.)
Flow top width inside pipe = 10.00(In.)
Critical Depth = 5.60(In.)
Pipe flow velocity = 4.06(Ft/s)
Travel time through pipe = 0.35 min.
Time of concentration (TC) = 6.15 min.
Process from Point/Station 6.000 to Point/Station 7.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 262.900(Ft.)
Downstream point/station elevation = 262.130(Ft.)
Pipe length = 73.40(Ft.) Manning's N = 0.013
No. of pipes =1 Required pipe flow = 1.099(CFS)
Given pipe size = 10.00(In.)
Calculated individual pipe flow = 1.099(CFS)
Normal flow depth in pipe = 4.94(In.)
Flow top width inside pipe = 10.00(In.)
Critical Depth = 5.60(In.)
Pipe flow velocity = 4.09(Ft/s)
Travel time through pipe = 0.30 min.
Time of concentration (TC) = 6.45 min.
Process from Point/Station 6.000 to Point/Station 7.000
**** SUBAREA FLOW ADDITION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Time of concentration = 6.45 min.
Rainfall intensity = 6.036(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA = 0.340
Subarea runoff = 0.953(CFS) for 0.200(Ac.)
Total runoff = 2.052(CFS)Total area = 0.400(Ac.)
Process from Point/Station 7.000 to Point/Station 8.000
**** PIPEFLOW TRAVEL TIME (User specified size) ****
Upstream point/station elevation = 262.130(Ft.)
Downstream point/station elevation = 258.750(Ft.)
Pipe length = 64.20(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 2.052(CFS)
Given pipe size = 10.00(In.)
Calculated individual pipe flow = 2.052(CFS)
Normal flow depth in pipe = 4.45(In.)
Flow top width inside pipe = 9.94(In.)
Critical Depth = 7.70(In.)
Pipe flow velocity = 8.75(Ft/s)
Travel time through pipe = 0.12 min.
Time of concentration (TC) = 6.57 min.
Process from Point/Station 7.000 to Point/Station 8.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 0.400(Ac.)
Runoff from this stream = 2.052(CFS)
Time of concentration = 6.57 min.
Rainfall intensity = 5.964(In/Hr)
Process from Point/Station 9.000 to Point/Station 10.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Initial subarea total flow distance = 77.400(Ft.)
Highest elevation = 269.230(Ft.)
Lowest elevation = 266.700(Ft.)
Elevation difference = 2.530(Ft.) Slope = 3.269 %
USER ENTRY OF INITIAL AREA TIME OF CONCENTRATION
Time of Concentration = 5.00 minutes
Rainfall intensity (I) = 7.114(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.850
Subarea runoff = 0.665(CFS)
Total initial stream area = 0.110(Ac.)
Process from Point/Station 10.000 to Point/Station 8.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 266.700(Ft.)
Downstream point elevation = 262.250(Ft.)
Channel length thru subarea = 217.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 22.220
Slope or 'Z' of right channel bank = 0.333
Estimated mean flow rate at midpoint of channel = 1.287(CFS)
Manning's'N' =0.015
Maximum depth of channel = 0.500(Ft.)
Flow(q) thru subarea = 1.287(CFS)
Depth of flow = 0.197(Ft.), Average velocity = 2.956(Ft/s)
Channel flow top width = 4.432(Ft.)
Flow Velocity = 2.96(Ft/s)
Travel time = 1.22min.
Time of concentration = 6.22 min.
Critical depth = 0.240(Ft.)
Adding area flow to channel
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Rainfall intensity = 6.177(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA = 0.297
Subarea runoff = 1.173(CFS) for 0.240(Ac.)
Total runoff = 1.838(CFS)Total area = 0.350(Ac.)
Depth of flow = 0.225(Ft.), Average velocity = 3.231 (Ft/s)
Critical depth = 0.277(Ft.)
Process from Point/Station 10.000 to Point/Station 8.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 0.350(Ac.)
Runoff from this stream = 1.838(CFS)
Time of concentration = 6.22 min.
Rainfall intensity = 6.177(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 2.052 6.57 5.964
2 1.838 6.22 6.177
Qmax(l) =
1.000* 1.000* 2.052) +
0.965* 1.000* 1.838) + = 3.827
Qmax(2) =
1.000* 0.947* 2.052) +
1.000* 1.000* 1.838) + = 3.781
Total of 2 streams to confluence:
Flow rates before confluence point:
2.052 1.838
Maximum flow rates at confluence using above data:
3.827 3.781
Area of streams before confluence:
0.400 0.350
Results of confluence:
Total flow rate = 3.827(CFS)
Time of concentration = 6.572 min.
Effective stream area after confluence = 0.750(Ac.)
Process from Point/Station 10.000 to Point/Station 8.000
**** SUBAREA FLOW ADDITION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Time of concentration = 6.57 min.
Rainfall intensity = 5.964(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA= 0.808
Subarea runoff = 0.989(CFS) for 0.200(Ac.)
Total runoff = 4.816(CFS)Total area= 0.950(Ac.)
Process from Point/Station 10.000 to Point/Station 8.000
**** SUBAREA FLOW ADDITION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Time of concentration = 6.57 min.
Rainfall intensity = 5.964(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA = 0.944
Subarea runoff = 0.811 (CFS) for 0.160(Ac.)
Total runoff = 5.627(CFS)Total area = 1.110(Ac.)
Process from Point/Station 12.000 to Point/Station 13.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Initial subarea total flow distance = 90.000(Ft.)
Highest elevation = 278.810(Ft.)
Lowest elevation = 273.400(Ft.)
Elevation difference = 5.410(Ft.) Slope = 6.011 %
USER ENTRY OF INITIAL AREA TIME OF CONCENTRATION
Time of Concentration = 5.00 minutes
Rainfall intensity (I) = 7.114(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.850
Subarea runoff = 0.302(CFS)
Total initial stream area = 0.050(Ac.)
Process from Point/Station 14.000 to Point/Station 15.000
**** INITIAL AREA EVALUATION ****
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Initial subarea total flow distance = 92.000(Ft.)
Highest elevation = 266.510(Ft.)
Lowest elevation = 259.650(Ft.)
Elevation difference = 6.860(Ft.) Slope = 7.457 %
USER ENTRY OF INITIAL AREA TIME OF CONCENTRATION
Time of Concentration = 5.00 minutes
Rainfall intensity (I) = 7.114(In/Hr) fora 100.0 year storm
Effective runoff coefficient used for area (Q=KCIA) is C = 0.850
Subarea runoff = 0.363(CFS)
Total initial stream area = 0.060(Ac.)
Process from Point/Station 15.000 to Point/Station 16.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 259.650(Ft.)
Downstream point elevation = 256.210(Ft.)
Channel length thru subarea = 65.000(Ft.)
Channel base width= 0.000(Ft.)
Slope or 'Z' of left channel bank = 20.000
Slope or 'Z1 of right channel bank = 50.000
Estimated mean flow rate at midpoint of channel = 0.695(CFS)
Manning's'N' =0.015
Maximum depth of channel = 0.500(Ft.)
Flow(q) thru subarea = 0.695(CFS)
Depth of flow = 0.085(Ft.), Average velocity = 2.768(Ft/s)
Channel flow top width = 5.930(Ft.)
Flow Velocity = 2.77(Ft/s)
Travel time = 0.39 min.
Time of concentration = 5.39 min.
Critical depth = 0.120(Ft.)
Adding area flow to channel
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
[COMMERCIAL area type ]
(Office Professional )
Impervious value, Ai = 0.900
Sub-Area C Value = 0.850
Rainfall intensity = 6.776(In/Hr) for a 100.0 year storm
Effective runoff coefficient used for total area
(Q=KCIA) is C = 0.850 CA = 0.144
Subarea runoff = 0.616(CFS)for 0.110(Ac.)
Total runoff = 0.979(CFS)Total area = 0.170(Ac.)
Depth of flow = 0.096(Ft.), Average velocity = 3.016(Ft/s)
Critical depth = 0.137(Ft.)
End of computations, total study area = 1.330 (Ac.)
APPENDIX B
(5. CAPACITY CALCULATIONS FOR EXISTING 12" PVC)
Manning Pipe Calculator
Given Input Data:
Shape Circular
Solving for Depth of Flow
Diameter 12.0000 in
Flowrate 4.8200 cfs =- r^^^«= *= - loo
Slope....... 0.0180ft/ft
Manning's n 0.0130
Computed Results:
Depth 9.9292 in
Area 0.7854 ft2
Wetted Area 0.6949 ft2
Wetted Perimeter 27.4177 in
Perimeter 37.6991 in
Velocity 6.9360 fps
Hydraulic Radius 3.6498 in
Percent Full 82.7435 %
Full flow Flowrate 4.7800 cfs
Full flow velocity 6.0861 fps
APPENDIX C
(6. TABLES AND CHARTS)
I I I I t I I i I 1 t * t I I I i I i I i i i j i i i
County of San Diego
Hydrology Manual
^'tfm^x^ .i.s^v^m£Rainfall Isopluvials
^r.:^ "V-^Hi'
100 Year Rainfall Event • 24 Hours
rrw^sfoKa&tfi :--••-.i •••••!•••, . \.>.j. i -•<'0r-.- •• -
1 ; I f *..(«.\ jmmmm
DPWCIS
1 I I I I 1 I I I \1 »i I 1 I i i i I I i I I i t
San Diego County Hydrology Manual
Date: June 2003
Section:
Page:
3
6 of 26
•«
Table 3-1
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use
NRCS Elements
Undisturbed Natural Terrain (Natural)
Low Density Residential (LDR)
Low Density Residential (LDR)
Low Density Residential (LDR)
Medium Density Residential (MDR)
Medium Density Residential (MDR)
Medium Density Residential (MDR)
Medium Density Residential (MDR)
High Density Residential (HDR)
High Density Residential (HDR)
Commercial/Industrial (N. Com)
Commercial/Industrial (G. Com)
Commercial/Industrial (O.P. Com)
Commercial/Industrial (Limited I.)
Commercial/Industrial (General I.)
County Elements
Permanent Open Space
Residential, 1.0 DU/A or less
Residential, 2.0 DU/A or less
Residential, 2.9 DU/A or less
Residential, 4.3 DU/A or less
Residential, 7.3 DU/A or less
Residential, 1 0.9 DU/A or less
Residential, 14.5 DU/A or less
Residential, 24.0 DU/A or less
Residential, 43.0 DU/A or less
Neighborhood Commercial
General Commercial
Office Professional/Commercial
Limited Industrial
General Industrial
Runoff Coefficient "C"
Soil Type
% IMPER.
0*
10
20
25
30
40
45
50
65
80
80
85
90
90
95
A
0.20
0.27
0.34
0.38
0.41
0.48
0.52
0.55
0.66
0.76
0.76
0.80
0.83
0.83
0.87
B
0.25
0.32
0.38
0.41
0.45
0.51
0.54
0.58
0.67
0.77
0.77
0.80
0.84
0.84
0.87
C
0.30
0.36
0.42
0.45
0.48
0.54
0.57
0.60
0.69
0.78
0.78
0.81
0.84
0.84
0.87
D
0.35
0.41
0.46
0.49
0.52
0.57
0.60
0.63
0.71
0.79
0.79
0.82
0.85
0.85
0.87
*The values associated with 0% impervious may be used for direct calculation of the
coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity.
is located in Cleveland National Forest).
DU/A - dwelling units per acre
NRCS » National Resources Conservation Service
3-6
runoff coefficient as described in Section 3.1.2 (representing the pervious runoff
Justification must be given that the area will remain natural forever (e.g., the area
BEST ORIGINAL
San Diego County Hydrology Manual
Date: June 2003
Section:
Page:
3
12 of 26
r
Note that the Initial Time of Concentration should be reflective of the general land-use at the
upstream end of a drainage basin. A single lot with an area of two or less acres does not have
a significant effect where the drainage basin area is 20 to 600 acres.
Table 3-2 provides limits of the length (Maximum Length (LM)) of sheet flow to be used in
hydrology studies. Initial Tj values based on average C values for the Land Use Element are
also included. These values can be used in planning and design applications as described
below. Exceptions may be approved by the "Regulating Agency" when submitted with a
detailed study.
Table 3-2
MAXIMUM OVERLAND FLOW LENGTH (LM)
& INITIAL TIME OF CONCENTRATION (T,)
ilement*
sfatural
LDR
LDR
LDR
MDR.
MDR
MDR
MDR
HDR
HDR
N. Com
G. Com
o.pycom
Limited
General
DU/
Acre
2
2.9
4.3
7.3
10.9
14.5
24
43
.5%
-M 1 Ti
50 1 13.2
50 1 12.2
50 11.3
50 10.7
50 10.2
50 9.2
50 8.7
50 I 8.2
50 6.7
50 5.3
50 5.
50 4.
50 4.
50 1 4
50 | 3
1%
-M 1 Ti
70 1 12.5
70 I 11.5
70 10.5
70 1 10.0
70 9.6
65 8.4
65 7.9
65 7.4
65 1 6.1
65 4.7
60 4.5
60 4.
60 3.
60 1 3.
60 1 3.
2%
LM
85
85
85
85
80
80
80
80
75
75
75
75
70
7
7
Ti
0.9
0.0
9.2
8.8
8.1
7.4
6.9
6.5
5.1
4.0
4.0
3.6
3.
3.
2.
3% | 5%
LM
00
00
100
95
95
95
90
90
90
85
85
85
80
8
8
Ti 1 LM 1 Ti
0.3 I 100 1 8.7
9.5 1 100 1 8.0
8.8 100 7.4
8.1 100 7.0
7.8 100 6.7
7.0 100 6.0
6.4 100 5.7
6.0 100 5.4
4.9 95 4.3
3.8 95 3.4
3.8 1 95 1 3.4
3.4 90 2.9
2.9 90 2.
2.9 90 2.
2.6 1 90 1 2.
10%
'M 1 Ti
00 1 6.9
00 I 6.4
100 5.8
100 5.6
100 5.3
100 4.8
100 4.5
100 4.3
100 3.5
100 2.7
100 2.7
100 2.4
100 2.2
100 2.2
100 1 1.9
*See Table 3-1 for more detailed description
3-12
Watershed Divide.
Watershed
Divide
Design Point
(Watershed Outlet)
Area "A" = Area "B"
SOURCE: California Division of Highways (1941) and KJrplch (1940)
Computation of Effective Slope for Natural Watersheds
FIGURE
3-5
Average Values of Roughness Coefficient (Manning's n)
Roughness
Type of Waterway Coefficient (n)
1. Closed Conduits (1)
Steel (not lined) 0.015
Cast Iron 0.015
Aluminum .021
Corrugated Metal (not lined) ' 0.024 •
Corrugated Metal (2) (smooth asphalt quarterlining) 0.021
Corrugated Metal (2) (smooth asphalt half lining) 0.018
Corrugated Metal (smooth asphalt full lining) 0.012
Concrete RCP 0.012
Clay (sewer) 0.013
Asbestos Cement-^ PV<i- 0.011
Drain Tile (terra cotta) 0.015
Cast-in-place Pipe 0.015
Reinforced Concrete Box 0.014
2. Open Channels (1)
a. Unlined
Clay Loam 0.023
Sand 0.020
b. Revetted
Gravel 0-030
Rock 0.040
Pipe and Wire °-025
Sacked Concrete 0.025
c. Lined
Corfcrete (poured) 0.014
Airl Blown Mortar (3) °-016
Asphaltic Concrete or Bituminous Plant Mix 0.018
d. Vegetated (5)
Grass lined, maintained -055
Grass and Weeds -°^5
Grass lined with concrete low flow channel .032
3. Pavement and Gutters (1)
I
Concrete . °-015
Bituminous (plant-mixed) 0.016
BEST ORIGINAL
APPENDIX XVI. A
1 i I i I I 1 I I i i
SOURCE: At
EXAMPLE: _ 7n F .
Given: Watercourse Distance (D) - 70 Feet
Slope (s) =1-3%
Runoff Coefficient (C)« 0.41
Overland Flow Time (T) = 9.5M.nutes
Rationa,Formu,a. Overland Time of Flow Nomograph
BEST ORIGINAL
3-3
EQUATION: V R*i 3"*
0.001
0.0009
0.0008
0.0007
0.0006
GENERAL SOLUTION
SOURCE: USDOT. FHWA. HDS-3 (1961)
FIGURE
Manning's Equation Nomograph 3-7
* I I » I i I i i i * I f I I i * i i I i I I I I | §1111
Application Form:
(a) Selected frequency
| (c) Adjusted P6
(2) =
= Intensity (m/hr)
Duration (min)
5 0 7 S 9 10 IS 20 30 40 SO 1
Minutes
Duration
Directions for Application:
(1) From precipitation maps determine 6 hr and 24 hr amounts
for the selected frequency. These maps are Included In the
County Hydrology Manual (10.50. and 100 yr maps Included
in the Design and Procedure Manual).
(2) Adjust 6 hr precipitation (if necessary) so that it is within
the range of 45% to 65% of the 24 hr precipitation (not
applicaple to Desert).
(3) Plot 6 hr precipitation on Iho right side of the chart.
(4) Draw a line through the point parallel to the plotted lines.
(5) This line Is the Intensity-duration curve for the location
being analyzed.
year
24 •P
jg. =
24
in.
o f (d)tx= .1^4 min. TOTAL INITIAL T//V/H
Note: This chart replaces the Intensity-Duralion-Frequency
curves used since 1965.
1.5
1 '
' 2.5
1
3 - 3.5
I : I
!4~.5
1
5.5
13.95 5.27 6.59.790 9.22
11814.24' 5.30 i6.36l7.42
i2.53i3.37' 4.21"'6.05!5.90
l.95| 2.59 i'3.24 [3.8914.54
Ii62j2.15-2.69r3.23j3.77
1.40 1.87 i 2.33'280 'J 27
1.66 2.07] 2 4912 90
4 10 4 TO ' 1 ft» ' n A i
1.24
T.03 1.38 1.72!207!2.41o.9oh.ig; 1.49! 1.79 2.09
080 1.08 1.33 1.59 1.86
0.61
0.51
0.44
O33.
O2S
0.82; 1.02
068
0.59
PJ»0^3
OJ3
0.54
0.85
0.73"
Qj»IO-»O6S
O47" ..,,
¥421056
1.23 1.43
1.02 1.19
6.88 1.03
P>»
0.78m?#aw
|IO.S4 II.86 13.17
I 8 48 ! 9.S4 :10.60
6.74 ! 7.58 : 8.42
5.19 j 5841 6.49
4.31T4.85 ; 5.39
3.73! 4.ZO ' 4 67
3.32 i 373! 4.15
2.76 j 310 ' 3.45
2^39
2.12
1.63
1.38
1.18
>i04*
tj^mm
BEST ORIGINAI Intensity-Duration Design Chart-Template
F 1 C D K E
3-1
i i I i i i i i i i I i i i i I i I i i i
= Intensity (in/hr)
= 6-Hour Precip
D = Duration (min)
P6 = 6-Hour Precipitation (in)
1 i I i
Directions for Application:
(1) From precipitation maps determine 6 hr and 24 hr amounts
for the selected frequency. These maps are Included in the
County Hydrology Manual (10. 50. and 100 yr maps Included
in the Design and Procedure Manual).
(2) Adjust 6 hr precipitation (if necessary) so that it is within
the range of 45% to 65% of the 24 hr precipitation (not
applicaple to Desert).
(3) Plot 6 hr precipitation on the right side of the chart.
(4) Draw a line through the point parallel lo the plotted lines.
(5) This line Is the intensity-duration curve for the location
being analyzed.
Application Form:
(a) Selected frequency
in., P
year
= 2,7
(c) Adjusted P6(2) =
5 mm.
in./hr.
Note: This chart replaces the Intensity-Duration-Frequency
curves used since 1965.
40 50 1
Duration
3 466
Hours
p& '
Duration
10
15
20
25
30
4(
90
60
90
120
150
180
340
300
360
1
1
; 1.5 2 . 2.5 3 - 3.5
i 1 ' 1 .' 1 ' 1
2.63 j 3.95 5.27 6.59 . 7.90 9.22
2.12 3.1814.24 5.30 i 6.36 17.42
1.68 2~.~S3i3.37" 4.2l'' 5.05 \ 5.90
1.30
1.08
0.93
0.83
0.69
0.60
0.53
0.41
0.34
0.29
O26
0.22
0.19
0.17
1.95
l'62
1.40
1.24
1.03
i 2/59 13.24 [3.89
2J5;2!69!~3.23
1.87! 2.33 '2.80
1.68
1.38
2.07 249
14.54
377
U27
290
1.72:2.07!2.41
0.90! 1.191 1.49 j 1.79
080
0.61
0.51
0.44
0.39
0.33
0.28
0.25
1.06J 1.33
0.821 1.02
0.68
0.69
0.52
0.43
6.36
0.33
0.85
0.73
0.06
0.54
0.47
0.42
1.59
1.23
1.02
0.88
0.78
0.65
0.66
0.50
2.09
1.86
1.43
1.19
1.03
0.91
0.70
0.66
0.68
4 4~5 "" 5" ' V5
1 ; 1 1 i 1
10.54 11.86 13.17
8.48 ! 9.54 . 10.60
6.74 7.58 ' 8.42
5.19 j 584 6.49
4!3i]4.85 ' 5.39
3.731 4M • 4.67
332
2.76
2.39
212
1.63
1.36
1.18
1.04
0.87
0.7S
0.87
373 ! 4.15
3.10 ' 3.45
2.69 ! 2.98
2.39
1.64
1.53
1.32
1.18
0. 86
045
0.75
2.85
2.04
1.70
1.47
1J1
1.08
6.94
0.84
6
14.49, 15.8)
11.66
927
7.13
593
5.13
456
179
3.28
2.92
12.72
to.n
7.78
6.46
5.60
494
4 13
3.58
3.18
2.25 2.45
1.87J 2.04
1.62TJ.78 j
M4 \\Jfl
1.19 I JO
1.03 1 1.13 1
OK too]
Intensity-Duration Design Chart - Template
F I C P R E
APPENDIX D
(7. HYDROLOGY MAP)
i » i i i i i i t i I i I i I i i i i I i f i I i
County of San Diego
Hydrology Manual
Rainfall Isopluvials
100 Year Rainfall Event - 6 Hours
BEST ORIGINAL
SiinGIS
j..,:.r4
---» ' :
EXISTING CONDITION
HYDROLOGY MAP
EL CAMINO TERRACE
PARCEL 3 OF PARCEL MAP--. ^- ~"\
0100= 0.35C.F.S.EX. 8" PVC O 2!!
"^/7\
i£X.24.X 24"DROP INLETV?
12 LF 15" PVC 0 11% MIN
357-6A
(248.40TG/245.50I.E),-rv ivf tT^.^/UI.UI t-J ' •
'TECT IN PLACET O(2«.OOI.E. \
DWG 357-6A \1'"
SCALE: 1"= 30'
EX. 142 LF~15" PVC
O 2.5% MIN PER DWG 357-6A
EXIST. 110 LF~12"
0 1.8% MIN PER
0100= 0.19 C.F.S.
0100= 2.06 C.F.S
(257.00I.E.)
(PROTECT
EX. IEWER c.o. \
(249.50 I.E. G.B.\
EXIST. 6
PER DWG 357-6A. .... ,„
(PROTECT IN PLACE)
\
0.93AC EX. TYPE T C.B.
(248.50 I.E.)
(PROTECT IN PLACE)
EXTfPTM CURB INLET
(248.50 I.E.)
(PROTECT IN PLACE)
\ \
IT!
PROPOSED CONDITION
HYDROLOGY MAP
EL CAMINO TERRACE"
^PARCEL 3 OF PARCEL MAP 18059
0100= 0.81 C.F.S.
0100=4.82 C.F.S.
REMOVE EXIST. 1" WATER LAT.
AND REPLACE WITH NEW 2"
WATER SERVICE MATCH EX. VlPE I/ \ A \262.75 RIM \
269 gr-8 PVCO4%
6\PVC 3.3
264.14
263:
68.95TC -22L20
4%0100=0.30 C.F.S.EX. 23'~
15Z MIN.
^PROTECT
PUCE)0100=0.98 C.F.S.
PLAAT 5/Z£7 75 LESS, THAN 11 x!7 ,
THIS IS A REDUCED COPY.
SCALE PLAN ACCORDINGLY.
269.53TG
268.33IE
SCALE: 1"=3fc
W:\data-W\PRDJECTS-W\05-062\DWG\CT 06-17\05-062-HYDRDLDGY-PRP.dwg 8/2/2007 3>31'30 PM PDT
APPENDIX E
(8. REFERENCE MATERIAL)
PACIFIC LAND SU EYING
2180 Garnet Avenue, ouite 3K
SAN DIEGO, CALIFORNIA 92109
(619) 270-4918
FAX (619) 581-0402
SHEET NO 1'
C.M RULATFO RY
PHFOKEn BV
1" =SCAI F
C.K. DECK
100*
OF
OAT* 10/8/96
DATE
DCQT DRlttlNAL PRELIMINARY HYDROIlOGY STUDt i ! iDCO I vyrviv^i i if %i*» . — , — i 1 — ; i 1 — 2 — ; — •. i
'; :- '• : : i
\ ' ': i : ; i j i ;
PLEASE SEE THE ATTACHED 2 SHEET EXHIBIT THAT SHOWS ;THE 4 PAF
PROJECT. PARCELS 1 AND 2 SHALL BE DEVELOPED WITH A ;COMMERCI/
PARCEL 3 IS ASSUMED tO BE ALSO DEVELOPED WlTti I. A .COMMERCIAL ...I
FUTURE. PARCEL 4 IS TO REMAIN AS OPEN SPACE, NO CHANGE IN HI
r UCJVDC KJ& V JL&W JLnJ& rUlilAJW IWo to 1 JLTiAl no ....;'
DATA USED: 1= 4.5 IN PER HR. j i j j j j
; RUNOFF COEFj FOR COMMERCIAL = J.85J \
PARCEL AREA COEF : j INTENSITY ' >
1 .74 AC. .85 4.5 IN/HR
2 1.21 AC. : " ; : ; ; 'I : : ;
3 1.46 > AC.
-"• ;/ "' : " : ' : l ''• '- ' "i : \ TOT/
CEI
L I
LDC
DRC
\ i
L
THIS TOTAL RUNOFF OF 13.04 CFS WILL BE REDUCED BY ±15Z DO Td TI
OF THIS PROJECT THAT SHEET FLOW TO THE EXISTING PUBLIC STREETS.
IVKg^FS WILL COLLECT INTO A PROPOSED ON-SITE PRIVATE STORM DI
AND FLOW NORTHEASTERLY TO A POINT OF CONNECTION WITH AN EXISTI1
LET JUST NORTH OF PARCEL 1.
'•if'I i i |illj i i !:
i i j i
i
'"I
S 0> THIS1 PROPOSED; i i i i! i ] I l
LDG. ON EACH. j
. ]JN TJHE INEAR !
I 1 ! • I
! ! i j
LOdY WILL1 OCCUB
1 1 i I. ..
: 1 i
i 1 i
i i 11 1 !_ I i 1.
FT^R)1 | (
Qibo- J •'• i! " ! 1
i i i
2 : O ^ ' f^Tfv..oj v*rp
4J63 \Cfi
5 J58 IcFS!
: : i
"f«iH
j j !
i i '•
E J^ORtlOl
I TrtEREFOI
tAlK SiSTI
G CURB I*
THE NET CHANGE AFTER DEVELOPMENT IS A FUNCTION OF THE ASSUMED RUNbFF COH
.85 VS. .50 (FOR VACANT LAND). COLUMN "A" ABOVE GIVES THESE
ESTIMATES. ;
THE RUNOFF FOR PARCEL 4 IS 14.3 CFS, WHICH WILL CONTINUE TO
THE EXISTING CANYON. ^^^F£SS/Q/^^^
|§I NO. 33757 |3| PREPARED BY: /i'J
BEFORi DBVEI
i ;
SHEET FLOW 1
1 . AM.A ,mj^i
^r"^^ -
^* in '^^ CHARLES R. DECK, PE \ 1
S
&,
M
^
F.
JOPt
0
~~*
^ i
"A"
BE^ORI
Qioo
11
) |iii
i i i
i.ele BFS!i l >
2.72 (JFS |• • i i
3. 29 CFS it i i
! 1 i
7.^7 C>S"j! 1
EN1
_
i
1 i
|
1
!i
j
•
I
i
i
BEST ORIGINAL
N
ATTACH MENTB
Permanent BMP Information
Landscaping & Irrigation
Integrated Pest Management (IPM) Program
Material Storage
Trash Enclosures
Storm Drain Signage
Filter Inserts
Vegetated Filter Strips
Bioretention Filtration System
Hydroseeding
Landscape Maintenance SC-73
O
a:o
uiCD
Objectives
Contain
Educate
Reduce/Minimize
Product Substitution
Description
Landscape maintenance activities include vegetation removal;
herbicide and insecticide application; fertilizer application;
watering; and other gardening and lawn care practices.
Vegetation control typically involves a combination of chemical
(herbicide) application and mechanical methods. All of these
maintenance practices have the potential to contribute pollutants
to the storm drain system. The major objectives of this BMP are
to minimize the discharge of pesticides, herbicides and fertilizers
to the storm drain system and receiving waters; prevent the
disposal of landscape waste into the storm drain system by
collecting and properly disposing of clippings and cuttings, and
educating employees and the public.
Approach
Pollution Prevention
m Implement an integrated pest management (IPM) program.
IPM is a sustainable approach to managing pests by
combining biological, cultural, physical, and chemical tools.
• Choose low water using flowers, trees, shrubs, and
groundcover.
• Consider alternative landscaping techniques such as
naturescaping and xeriscaping.
• Conduct appropriate maintenance (i.e. properly timed
fertilizing, weeding, pest control, and pruning) to help preserve
the landscapes water efficiency.
Targeted Constituents
Sediment i
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
A SQA
California
Stormwater
Quality
Association
January 2003 California Stormwater BMP Handbook
Municipal
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SC-73 Landscape Maintenance
•*" • Consider grass cycling (grass cycling is the natural recycling of grass by leaving the clippings
on the lawn when mowing. Grass clippings decompose quickly and release valuable
nutrients back into the lawn).
m*i Suggested Protocols
** Mowing, Trimming, and Weeding
*" • Whenever possible use mechanical methods of vegetation removal (e.g mowing with tractor-
M type or push mowers, hand cutting with gas or electric powered weed trimmers) rather than
applying herbicides. Use hand weeding where practical.
*M • Avoid loosening the soil when conducting mechanical or manual weed control, this could
lead to erosion. Use mulch or other erosion control measures when soils are exposed.
"" • Performing mowing at optimal times. Mowing should not be performed if significant rain
p* events are predicted.
*.* • Mulching mowers may be recommended for certain flat areas. Other techniques may be
employed to minimize mowing such as selective vegetative planting using low maintenance
grasses and shrubs.
• Collect lawn and garden clippings, pruning waste, tree trimmings, and weeds. Chip if
•i necessary, and compost or dispose of at a landfill (see waste management section of this fact
sheet).
m • Place temporarily stockpiled material away from watercourses, and berm or cover stockpiles
to prevent material releases to storm drains.
«Planting
m • Determine existing native vegetation features (location, species, size, function, importance)
and consider the feasibility of protecting them. Consider elements such as their effect on
drainage and erosion, hardiness, maintenance requirements, and possible conflicts between
•I preserving vegetation and the resulting maintenance needs.
•*• • Retain and/or plant selected native vegetation whose features are determined to be
— beneficial, where feasible. Native vegetation usually requires less maintenance (e.g.,
irrigation, fertilizer) than planting new vegetation.
4&t • Consider using low water use groundcovers when planting or replanting.m
Waste Management
^ • Compost leaves, sticks, or other collected vegetation or dispose of at a permitted landfill. Do
^ not dispose of collected vegetation into waterways or storm drainage systems.
*•, • Place temporarily stockpiled material away from watercourses and storm drain inlets, and
berm or cover stockpiles to prevent material releases to the storm drain system.
• Reduce the use of high nitrogen fertilizers that produce excess growth requiring more
*" frequent mowing or trimming.
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Landscape Maintenance _ SC-73
~""~™~ ~"^""~"" "™" ~" ~™ ^ "™ """" ~"" ^""""" "^™""™" ~"~ "
• Avoid landscape wastes in and around storm drain inlets by either using bagging equipment
or by manually picking up the material.
Irrigation
m Where practical, use automatic timers to minimize runoff.
• Use popup sprinkler heads in areas with a lot of activity or where there is a chance the pipes
may be broken. Consider the use of mechanisms that reduce water flow to sprinkler heads if
broken.
• Ensure that there is no runoff from the landscaped area(s) if re-claimed water is used for
irrigation.
• If bailing of muddy water is required (e.g. when repairing a water line leak), do not put it in
the storm drain; pour over landscaped areas.
• Irrigate slowly or pulse irrigate to prevent runoff and then only irrigate as much as is
needed.
• Apply water at rates that do not exceed the infiltration rate of the soil.
Fertilizer and Pesticide Management
• Utilize a comprehensive management system that incorporates integrated pest management
(IPM) techniques. There are many methods and types of IPM, including the following:
- Mulching can be used to prevent weeds where turf is absent, fencing installed to keep
rodents out, and netting used to keep birds and insects away from leaves and fruit.
Visible insects can be removed by hand (with gloves or tweezers) and placed in soapy
water or vegetable oil. Alternatively, insects can be sprayed off the plant with water or in
some cases vacuumed off of larger plants.
- Store-bought traps, such as species-specific, pheromone-based traps or colored sticky
cards, can be used.
Slugs can be trapped in small cups filled with beer that are set in the ground so the slugs
can get in easily.
- In cases where microscopic parasites, such as bacteria and fungi, are causing damage to
plants, the affected plant material can be removed and disposed of (pruning equipment
should be disinfected with bleach to prevent spreading the disease organism).
Small mammals and birds can be excluded using fences, netting, tree trunk guards.
Beneficial organisms, such as bats, birds, green lacewings, ladybugs, praying mantis,
ground beetles, parasitic nematodes, trichogramma wasps, seed head weevils, and
spiders that prey on detrimental pest species can be promoted.
• Follow all federal, state, and local laws and regulations governing the use, storage, and
disposal of fertilizers and pesticides and training of applicators and pest control advisors.
January 2003 California Stormwater BMP Handbook 3 of 6
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SC-73 Landscape Maintenance
—-»i^—•—— , —»— ——i -~—^—
• Use pesticides only if there is an actual pest problem (not on a regular preventative
schedule).
• Do not use pesticides if rain is expected. Apply pesticides only when wind speeds are low
(less than 5 mph).
• Do not mix or prepare pesticides for application near storm drains.
• Prepare the minimum amount of pesticide needed for the job and use the lowest rate that
will effectively control the pest.
• Employ techniques to minimize off-target application (e.g. spray drift) of pesticides,
including consideration of alternative application techniques.
• Fertilizers should be worked into the soil rather than dumped or broadcast onto the surface.
• Calibrate fertilizer and pesticide application equipment to avoid excessive application.
m Periodically test soils for determining proper fertilizer use.
• Sweep pavement and sidewalk if fertilizer is spilled on these surfaces before applying
irrigation water.
• Purchase only the amount of pesticide that you can reasonably use in a given time period
(month or year depending on the product).
• Triple rinse containers, and use rinse water as product. Dispose of unused pesticide as
hazardous waste.
• Dispose of empty pesticide containers according to the instructions on the container label.
Inspection
• Inspect irrigation system periodically to ensure that the right amount of water is being
applied and that excessive runoff is not occurring. Minimize excess watering, and repair
leaks in the irrigation system as soon as they are observed.
• Inspect pesticide/fertilizer equipment and transportation vehicles daily.
Training
• Educate and train employees on use of pesticides and in pesticide application techniques to
prevent pollution. Pesticide application must be under the supervision of a California
qualified pesticide applicator.
• Train/encourage municipal maintenance crews to use IPM techniques for managing public
green areas.
• Annually train employees within departments responsible for pesticide application on the
appropriate portions of the agency's IPM Policy, SOPs, and BMPs, and the latest IPM
techniques.
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Landscape Maintenance SC-73
*M
"" • Employees who are not authorized and trained to apply pesticides should be periodically (at
least annually) informed that they cannot use over-the-counter pesticides in or around the
workplace.
• Use a training log or similar method to document training.
Spill Response and Prevention
""" • Refer to SC-n, Spill Prevention, Control & Cleanup
• Have spill cleanup materials readily available and in a know in location
• Cleanup spills immediately and use dry methods if possible.
im
• Properly dispose of spill cleanup material.
— Other Considerations
• The Federal Pesticide, Fungicide, and Rodenticide Act and California Title 3, Division 6,
**• Pesticides and Pest Control Operations place strict controls over pesticide application and
handling and specify training, annual refresher, and testing requirements. The regulations
generally cover: a list of approved pesticides and selected uses, updated regularly; general
^» application information; equipment use and maintenance procedures; and record keeping.
The California Department of Pesticide Regulations and the County Agricultural
** Commission coordinate and maintain the licensing and certification programs. All public
agency employees who apply pesticides and herbicides in "agricultural use" areas such as
"* parks, golf courses, rights-of-way and recreation areas should be properly certified in
m accordance with state regulations. Contracts for landscape maintenance should include
similar requirements.
m*P
• All employees who handle pesticides should be familiar with the most recent material safety
** data sheet (MSDS) files.
• Municipalities do not have the authority to regulate the use of pesticides by school districts,
«• however the California Healthy Schools Act of 2000 (AB 2260) has imposed requirements
on California school districts regarding pesticide use in schools. Posting of notification prior
1-1 to the application of pesticides is now required, and IPM is stated as the preferred approach
m to pest management in schools.
„. Requirements
Costsmf
Additional training of municipal employees will be required to address IPM techniques and
M BMPs. IPM methods will likely increase labor cost for pest control which may be offset by lower
chemical costs.«•
Maintenance
l"- Not applicable
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SC-73 Landscape Maintenance
Supplemental Information
Further Detail of the BMP
Waste Management
Composting is one of the better disposal alternatives if locally available. Most municipalities
either have or are planning yard waste composting facilities as a means of reducing the amount
of waste going to the landfill. Lawn clippings from municipal maintenance programs as well as
private sources would probably be compatible with most composting facilities
Contractors and Other Pesticide Users
Municipal agencies should develop and implement a process to ensure that any contractor
employed to conduct pest control and pesticide application on municipal property engages in
pest control methods consistent with the IPM Policy adopted by the agency. Specifically,
municipalities should require contractors to follow the agency's IPM policy, SOPs, and BMPs;
provide evidence to the agency of having received training on current IPM techniques when
feasible; provide documentation of pesticide use on agency property to the agency in a timely
manner.
References and Resources
King County Stormwater Pollution Control Manual. Best Management Practices for Businesses.
1995. King County Surface Water Management. July. On-line:
http://dnr.metrokc.gov/wlr/dss/spcm.htm
Los Angeles County Stormwater Quality Model Programs. Public Agency Activities
http://ladpw.org/wind/npdes/model links.cfm
Model Urban Runoff Program: A How-To Guide for Developing Urban Runoff Programs for
Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal
Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area
Governments, Woodward-Clyde, Central Coast Regional Water Quality Control Board. July.
1998.
Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp introduction.asp
Santa Clara Valley Urban Runoff Pollution Prevention Program. 1997 Urban Runoff
Management Plan. September 1997, updated October 2000.
United States Environmental Protection Agency (USEPA). 2002. Pollution Prevention/Good
Housekeeping for Municipal Operations Landscaping and Lawn Care. Office of Water. Office of
Wastewater Management. On-line: http://www.epa.gov/npdes/menuotbmps/poll 8.htm
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Efficient Irrigation SD-12
cro
inCO
Design Objectives
•/ Maximize Infiltration
•/ Provide Retention
/ Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
•a
m
Description
Irrigation water provided to landscaped areas may result in excess irrigation water being
conveyed into stormwater drainage systems.
Approach
Project plan designs for development and redevelopment should include application methods of
irrigation water that minimize runoff of excess irrigation water into the stormwater conveyance
system.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for
development or redevelopment. (Detached residential single-family homes are typically
excluded from this requirement.)
Design Considerations
Designing New Installations
The following methods to reduce excessive irrigation runoff should be considered, and
incorporated and implemented where determined applicable and feasible by the Permittee:
• Employ rain-triggered shutoff devices to prevent irrigation after precipitation.
• Design irrigation systems to each landscape area's specific water requirements.
• Include design featuring flow reducers or shutoff valves triggered by a pressure drop to
control water loss in the event of broken sprinkler heads or lines.
• Implement landscape plans consistent with County or City water conservation resolutions,
which may include provision of water sensors, programmable
irrigation times (for short cycles), etc. ^ - £ Q/\
California
Stormwater
Quality
Association
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
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SD-12 Efficient Irrigation
• Design timing and application methods of irrigation water to minimize the runoff of excess
irrigation water into the storm water drainage system.
• Group plants with similar water requirements in order to reduce excess irrigation runoff and
promote surface filtration. Choose plants with low irrigation requirements (for example,
native or drought tolerant species). Consider design features such as:
Using mulches (such as wood chips or bar) in planter areas without ground cover to
minimize sediment in runoff
Installing appropriate plant materials for the location, in accordance with amount of
sunlight and climate, and use native plant materials where possible and/or as
recommended by the landscape architect
Leaving a vegetative barrier along the property boundary and interior watercourses, to
act as a pollutant filter, where appropriate and feasible
- Choosing plants that minimize or eliminate the use of fertilizer or pesticides to sustain
growth
• Employ other comparable, equally effective methods to reduce irrigation water runoff.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, increases in gross
floor area and/or exterior construction, and land disturbing activities with 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. If the definition applies, the steps outlined under "designing new installations"
above should be followed.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood
Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countrywide Technical Guidance Manual for Stormwater Quality Control Measures,
July 2002.
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Landscape Maintenance
BEST
Photo Credit: Geoff Brosseau
Description
This category includes businesses that provide landscaping and landscape
maintenance/gardening services.
Pollutant Sources
The following are sources of pollutants:
• Selecting plants or landscape design
• Installing new landscaping
• Maintaining landscapes
• Using pesticides and fertilizers
• Using gas-powered equipment
• Working near waterbodies
Pollutants can include:
• Nutrients (fertilizers, yard wastes)
» Pesticides
• Heavy metals (copper, lead, and zinc)
• Hydrocarbons (fuels, oils and grease)
• Sediments
Approach
Minimize the potential for stormwater pollution and the need for
resources/controls (water, pesticides, fertilizers) by creating and
maintaining landscapes in a way that is compatible with the local
soils, climate, and amount of rain and sun. Make stormwater
SQA
California
Stormwater
Quality
Association
January 2003 California Stormwater BMP Handbook
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Landscape Maintenance
pollution prevention BMPs a part of standard operating procedures and the employee
training program. Provide employee education materials in the first language of employees,
as necessary.
Source Control BMPs
The best management practices are listed by activity or area.
Landscape Design
• Specify native, low maintenance, and insectary (attract beneficial insects) plants and
landscape designs.
• Design zoned, water-efficient irrigation systems using technologies such drip irrigation,
soaker hoses, or microspray systems.
• Do not landscape riparian areas, except to remove non-native plants and replace them
with native riparian landscaping.
• Replant with native species where possible when landscaping or building an ornamental
pond. Do not assume something is native because you have seen it in your area. Contact
the local nursery for information or visit the California Exotic Pest Plant Council website
fwww.caleppc.org).
Landscape Installation
• Protect stockpiles and landscaping materials from wind and rain by storing them under
tarps or secured plastic sheeting.
• Schedule grading and excavation projects during dry weather.
• Divert runoff from exposed soils or lower its velocity by leveling and terracing.
• Use temporary check dams or ditches to divert runoff away from storm drains.
• Protect storm drains with sandbags or other sediment controls.
• Revegetation is an excellent form of erosion control for any site. Keep soils covered with
vegetation or temporary cover material (mulch) to control erosion.
• Check plant roots before buying a plant. Do not buy plants with roots are that kinked or
circling around the container. Do not buy plants with soft, rotten, or deformed root
crowns.
• Do not pile soil around the plant any higher than the root crown.
Landscape Maintenance
Yard Waste
• Allow leaf drop to become part of the mulch layer in tree, shrub, and groundcover areas.
• Keep lawn mower blades sharp and grasscycle.
• Grasscycle - leave grass clippings on the lawn when mowing. Once cut, grass clippings
first dehydrate, then decompose, quickly disappearing from view. Proper mowing is
required for successful grasscycling. Cut grass when the surface is dry, and keep mower
blades sharp. Follow the "1/3 Rule": mow the lawn often enough so that no more than
1/3 of the length of the grass blade is cut in any one mowing. Frequent mowing will
produce short clippings that will not cover up the grass surface. The lawn may have to be
cut every seven days when the lawn is growing fast but only every 7 to 14 days when the
lawn is growing slowly.
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Landscape Maintenance
• Do not leave clippings on pavement or sidewalks where they can wash off into the street,
gutter, or storm drain.
• Collect lawn and garden clippings, pruning waste, and tree trimmings. Chip if necessary,
and compost or take to the local municipal yard waste recycling/composting facility.
• In communities with curbside pick-up of yard waste, place clippings and pruning waste at
the curb in approved bags or containers. No curbside pickup of yard waste is available for
commercial properties.
• Do not blow or rake leaves or other yard waste into the street, or place yard waste in
gutters or on dirt shoulders, unless it is being piled up for recycling (allowed by some
municipalities). After pick-up, sweep up any leaves, litter, or residue in gutters or on
street.
Fertilizing and Pruning
• Perform soil analysis seasonally to determine actual fertilization need and application
rates.
• Fertilize garden areas with a mulch of leaves, bark, or composted manure and/or garden
waste.
• Apply chemical fertilizer only as needed, when plants can best use it, and when the
potential for it being carried away by runoff is low. Make sure the fertilizer spreader is
calibrated.
• Prune plants sparingly, if at all. A healthy plant - one that is native to the area and
growing under the right conditions - should not need pruning, except when it is not in
the right location (where safety or liability is a concern).
Watering
• Use soil probes to determine soil moisture depth, overall moisture levels, and the need to
adjust irrigation schedules.
Pest and Weed Control
• Anyone who is in the business of landscape maintenance and performs pest control as
part of providing that service must have a license from the state to apply pesticides.
Contact the Department of Pesticide Regulation for more information.
• Become trained in and offer customers less-toxic pest control or Integrated Pest
Management (IPM).
• The label on a pesticide container is a legal document. Use a pesticide only as instructed
on the label.
• Store pesticides, fertilizers, and other chemicals indoors or in a shed or storage cabinet.
• Use pesticides sparingly, according to instructions on the label. Rinse empty containers,
and use rinsewater as product.
• Dispose of rinsed, empty containers in the trash. Dispose of unused pesticides as
hazardous waste.
• To control weeds, use drip irrigation and mulch. Hand-pull weeds including roots or cut
down to ground. Repeat cutting before they flower, grow new leaves, or go to seed. Use
herbicides containing pelargonic acid or herbiciclal soap as a last resort.
January 2003 California Stormwater BMP Handbook 3 of 5
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Landscape Maintenance
Handling Gasoline
• Use only containers approved by a nationally recognized testing lab, such as Underwriters
Laboratories (UL). Keep the container tightly sealed. Containers should be fitted with a
spout to allow pouring without spilling and to minimize the generation of vapors.
• Fill cautiously. Always use a funnel and/or spout to prevent spilling or splashing when
fueling power mowers, blowers, and all other gas-powered equipment.
• Avoid spilling gasoline on the ground, especially near wells. If a spill occurs use kitty
litter, saw dust, or an absorbent towel to soak up the spill, then dispose of it properly.
• Store carefully. Gasoline moves quickly through soil and into groundwater, therefore,
store and use gasoline and fuel equipment as far away from your drinking water well as
possible. Be certain to keep a closed cap on the gasoline container. Store at ground level,
not on a shelf to minimize the danger of falling and spilling.
• Do not dispose of gasoline down the drain, into surface water, onto the ground, or in the
trash. Contact the local municipality for directions on proper disposal of excess or old
gasoline. Transport old gas in an approved gasoline container.
Working Near Waterbodies
• Do not dump lawn clippings, other yard waste, or soil along creek banks or in creeks.
• Do not store stockpiles of materials (soil, mulch) along creek banks. These piles can
erode over time into a creek.
• Do not spray pesticides or fertilizers by creeks.
• Do not over water near streams. The excess water may carry pesticides, fertilizers,
sediments, and anything else in its path directly into the creek.
• Do not remove native vegetation along creek banks or remove large woody debris from
creek banks or creeks. Instead, contact the local municipal planning department and
Department of Fish & Game for guidance.
Treatment Control BMPs
Not applicable.
More Information
Bay Area Stormwater Management Agencies Association, 1999. Start at the Source - Design
Guidance Manual for Stormwater Quality Protection. (http://www.basmaa.org).
Bay Area Water Pollution Prevention Agencies, 1998 - 2002. Less-Toxic Pest Management
Fact Sheets, Less-Toxic Product List, and In-store display and promotion materials.
f http://www.basmaa.org)
California Exotic Pest Plant Council, 1999. Exotic Pest Plant List, (http://www.caleppc.org)
California Integrated Waste Management Board, 1999. Grasscycle! Make the Most of Your
Lawn. Make the Most of Your Time. (http://www.ciwmb.ca.gov/organics/Pubs.htni).
California Integrated Waste Management Board, 2001. Resource-Efficient Turf Management
and Resource-Efficient Landscaping. (http://www.ciwnib.ca.gov/organics/Pubs.htm).
Contra Costa County, no date. Grasscycle! Clip your waste! (http://grasscycle.abag.ca.gov).
4 of 5 California Stormwater BMP Handbook January 2003
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Landscape Maintenance
Mario County Stormwater Pollution Prevention Program, no date. Creek Care: A Guide for
Urban Marin Residents. (http://www.mcstoppp.Org/1.
Professional Lawn Care Association of America, 1997. Water Quality and Your Lawn.
(http://w\rw.pesp.org/iQQfj/plcaaQ5-final.htm).
San Francisquito Watershed Council and San Mateo Countywide Stormwater Pollution
Prevention Program, no date. Streamside Planting Guide for San Mateo and Santa Clara
County Streams, (http://www.acterra.0rg/watershed/l
The Alliance for Proper Gasoline Handling, 1999. Consumer Tips for Proper Gasoline
Handling, (http://www.gas-care.org/consumer tips.htm).
Videos
California Integrated Waste Management Board, 1999. Grasscycle! Make the Most of Your
Lawn. Make the Most of Your Time. (http://www.ciwmb.ca.gov/organics/Pubs.htm).
CCCSD, 2001. The Healthy Home & Garden - Less-Toxic Pest Control (for residents).
(http://www.centralsan.org/education/ipm/hgonlineguide.html).
References
Bay Area Stormwater Management Agencies Association, 1999. Start at the Source - Design
Guidance Manual for Stormwater Quality Protection. (http://www.basmaa.org).
Bay Area Water Pollution Prevention Agencies, 1998 - 2002. Less-Toxic Pest Management
Fact Sheets, Less-Toxic Product List, and In-store display and promotion materials.
(http://www.basmaa.org)
California Integrated Waste Management Board, 1999. Grasscycle! Make the Most of Your
Lawn. Make the Most of Your Time. (http://www.ciwmb.ca.gov/organics/Pubs.htm).
California Integrated Waste Management Board, 2001. Resource-Efficient Turf Management
and Resource-Efficient Landscaping. (http://www.ciwmb.ca.gov/organics/Pubs.htrn).
City of Bellevue, 1991. Water Quality Protection for Landscaping Businesses, Business
Partners for Clean Water.
Contra Costa County, no date. Grasscycle! Clip your waste! (http://grasscycle.abag.ca.gov).
County of Los Angeles, no date. Landscaping and Nursery Facilities - Best Management
Practices, Project Pollution Prevention.
Marin County Stormwater Pollution Prevention Program, no date. Creek Care: A Guide for
Urban Marin Residents, (http://www.mcstoppp.org/).
Professional Lawn Care Association of America, 1997. Water Quality and Your Lawn.
(http://www.pesp.org/lQQ5/plcaa9.ci-final.htm).
San Francisquito Watershed Council and San Mateo Countywide Stormwater Pollution
Prevention Program, no date. Streamside Planting Guide for San Mateo and Santa Clara
County Streams, (http://www.acterra.org/watershed/)
Santa Clara Valley Urban Runoff Pollution Prevention Program, 2001. Landscaping,
Gardening, and Pool Maintenance - Best Management Practices for the Construction
Industry.
The Alliance for Proper Gasoline Handling, 1999. Consumer Tips for Proper Gasoline
Handling, (http://www.gas-care.org/consuirter tips.htm).
January 2003 California Stormwater BMP Handbook 5 of 5
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POLLUTION PREVENTION FACT SHEETS:
INTEGRATED PEST MANAGEMENT
PEST CONTROL
Description
This management measure involves limiting the impact of pesticides on water quality by educating
residents and businesses on alternatives to pesticide use and proper storage and application techniques.
The presence of pesticides in stormwater runoff has a direct impact on the health of aquatic organisms
and can present a threat to humans through contamination of drinking water supplies. The pesticides of
greatest concern are insecticides, such as diazinon and chloropyrifos, (CWP, 1999 and Schueler, 1995)
that even at very low levels can be harmful to aquatic life. A recent study of urban streams by the U.S.
Geological Survey found that some of the more commonly used household and garden insecticides
occurred at higher frequencies and concentrations in urban streams than in agricultural streams (USGS,
1999). The study also found that these insecticide concentrations were frequently in excess of US EPA
guidelines for protection of aquatic life. For more information see, Urban Pesticides: From the Lawn to
the Stream, Article 5 in The Practice of Watershed Protection.
The major source of pesticides to urban streams are home applications of products designed to kill
insects and weeds in the lawn and garden. It has been estimated that an average acre of a well
maintained urban lawn receives an annual input of five to seven pounds of pesticides (Schueler, 1995).
Pesticide pollution prevention programs try to limit adverse impacts of insecticides and herbicides by
providing information on alternative pest control techniques other than chemicals or explaining how to
determine the correct dosages needed to manage pests. Lawn care and landscaping management
programs often include pesticide use management as part of their outreach message.
Applicability
The US EPA estimates that nearly 70 million pounds of active pesticide ingredients are applied to urban
lawns each year. Table 1 compares surveys on residential pesticide use in eleven different areas of the
country, broken down by insecticide and herbicide use. At first glance, it appears that pesticide
application rates vary greatly, ranging from a low of 17% to a high of 87%.
Some patterns do emerge, however. For example, insecticides tend to be applied more widely in warm
weather climates where insect control is a year round problem (such as Texas, California, and Florida).
Anywhere from 50 to 90% of residents reported that they had applied insecticides in the last year in
warm-weather areas. This can be compared to 20 to 50% levels of insecticide use reported in colder
regions where hard winters can help keep insects in check.
In contrast, herbicide application rates tend to be higher in cold weather climates to kill the weeds that
arrive with the onset of spring (60 to 75% in the Michigan, Wisconsin and Minnesota surveys). For
more information see Understanding Watershed Hcliavioi\ Article 126 in The Practice of Watershed
Protection.
Table 1. A Comparison of Eleven Surveys of Residential Insecticide and Weedkiller Use I
Study
Chesapeake Bay
Swann, 1999
Maryland
Kroll and Murphy, 1994
Virginia
Aveni, 1998
Maryland,
Smithefa/., 1994
Minnesota,
Morris and Traxler, 1997
Michigan,
De Young, 1997
Minnesota,
Dindorf, 1992
Wisconsin,
Kroupa, 1995
Florida,
Knoxefa/., 1995
Texas,
NSR, 1998
California,
Scanlin and Cooper, 1997
Number of
Respondents
656
403
100
100
981
432
136
204
659
350
600
% Using Insecticides
21%
42%
66%
23%
40%
17%
83%
87%
50%
% Using Herbicides
32%
n/a
75%
59%
76%
24% **
note difference in self reported herbicide use and those that use a weed and feed product
(herbicide combined with fertilizer)
Design Considerations
The use of integrated pest management (IPM) is a popular way for program managers to educate
residents and businesses on alternatives to chemical pesticides. IPM reflects a holistic approach to pest
control that examines the interrelationship between soil, water, air, nutrients, insects, diseases,
landscape design, weeds, animals, weather and cultural practices to select an appropriate pest
management plan. The goal of an IPM program is not to eliminate pests but to manage them to an
acceptable level while avoiding disruptions to the environment. An IPM program incorporates
preventative practices in combination with nonchemical and chemical pest controls to minimize the use
of pesticides and promote natural control of pest species. Three different nonchemical pest control
practices - biological (good bugs that cat pests), cultural (handpicking of pests, removal of diseased
plants, etc) and mechanical (zappers, paper collars, etc) - are used to limit the need for chemicals. In
those instances when pesticides are required, programs seek to have users try less toxic products such as
insecticidal soaps. The development of higher tolerance levels among residents for certain weed species
is a central concept of IPM programs for reducing herbicide use.
Education on the proper use of pesticides can and is often included in many lawn care and landscaping
management programs. Most often this is in the form of informational brochures or fact sheets on
pesticide use around the home or garden. These information packets include tips on identifying pest
problems and selecting treatment approaches that reduce environmental impacts, less toxic pest control
products if chemical control is necessary, and the proper mixing, application rates and cleanup
procedures for pesticide use. Program managers can consult cooperative extension programs and
university agricultural programs for more information regarding pest control techniques that are more
water quality friendly.
Limitations
The public perception that no alternative to pesticide use exists is probably the greatest limitation that
program managers will face. Surveys tell us that the public has a reasonably good understanding about
the potential environmental dangers of pesticides. Several surveys indicate that residents do understand
environmental concerns about pesticides, and consistently rank them as the leading cause of pollution in
the neighborhood (Elgin DDB, 1996). Even so, pesticide use still remains high in many urban areas
(see Table 1). The time required for homeowners to learn more about alternative pest control
techniques may also limit program effectiveness. Many residents prefer the ease of just spraying a
chemical on their lawns to other pest control techniques they perceive as more time intensive and less
reliable. Managers should recognize that IPM programs have their own limitations, including questions
about the effectiveness of alternative pest control techniques.
Effectiveness
Currently, a national study of the effectiveness of alternative pest control programs at reducing pesticide
use and protecting water quality has not been performed. Cooperative extension and university
agriculture programs across the country have performed studies of the ability of distinct alternative pest
control techniques at limiting pesticide use, but a synthesis of these individual studies into a national
report has not been performed. However, the need for pesticide control piograms is evident from recent
studies on the presence of insecticides in stotmwater. Results of recent sampling of urban streams
caused the USGS to conclude that the presence of insecticides in urban streams may be a significant
obstacle to restoring urban streams. (USGS, 1999). Table 2 examines eight studies on stonnwater
runoff and insecticide concentrations and provides an example of how insecticides persist even after
their use is discontinued.
Additional research done in the San Francisco Bay Region regarding diazinon use further illustrates the
need for pest control programs. Results of the study show that harmful diazinon levels can be produced
in urban streams from use at only a handful of individual homes in a given watershed (CVVP, 1999).
Due to the solubility of diazinon, current stonnwater and wastewater treatment technologies cannot
significantly reduce diazinon levels. The best tool for controlling diazinon in urban watersheds is
through source control by educating residents and businesses on pesticide alternatives and safe
application. For more information see Diazinon Sources in Runoff from the San Francisco Ruy Region.
Article 16 in The Practice of Watershed Protection.
An example of successful use of IPM is the Grounds Maintenance Program for the City of Eugene,
Oregon. This program was started in the early l9SO's and includes all the city public parks and
recreation areas. The city uses a variety of IPM methods, including water blasting to remove aphids,
insecticidal soaps and limited use of pesticides. The city has also adopted higher tolerance levels for
certain weed and pest species that reduces the need to apply pesticides and herbicides. Since the
programs inception, pesticide usage by the City of Eugene has dropped by more than 75% (Lehner et
al., 1999). No exact cost savings have been calculated from the use of the IPM program, but the city
turf and grounds supervisor is convinced that it saves money and has little citizen opposition.
Table 2: Banned or Restricted Insecticides Found in Stormwater Runoff Concentrations in /ig/l
(ppb) (Schueler, 1995)
Study
Baltimore
Kroll and Murphy, 1994
Rhode Island
Cohen et al., 1990
Atlanta
Hippeetal., 1994
Atlanta
Thomas and McClelland, 1994
Milwaukee
Bannerman, 1994
Washington, DC
MWCOG, 1983
Northern VA
Dewberry and Davis, 1989
Toronto
D'Andrea and Maunder, 1994
Chlordane
0.52
Detected
NA
Detected
Detected
0.2
ND
NA
Lindane
0.18
NA
0.01 (0.048)
NX
Detected
0.2
Trace
0.5 to 2
Dieldrin
2.44
NA
NA
NX
Detected
0.2
ND
0.1 to 2
Other
-
NA
-
heptachlor
DDT, DDE
heptachlor
Endrin
-
ND = Not Detected, NA = Not Analyzed, NX= Detection only reported if they exceeded water quality
standards
Cost
The cost of educating residents on proper pesticide use varies greatly depending on the intensity of the
effort. Like lawn care and landscaping programs, some cities have begun partnerships that include
training of retail employees on IPM techniques. In addition, promotional materials and displays on safer
pesticide alternatives are set up. The cost of staff time for training and production of materials must be
included in any cost estimate. Since there are currently a number of good fact sheets on IPM and
pesticide use available through cooperative extension programs, managers should consider using this
source instead of creating a new one. Another way to save cost would be to utili/.e master gardener
volunteers to help with training, both for residents and store employees.
References
Aveni, M. 1998. Water-wise gardener program: summary report. Unpublished data. Virginia
Cooperative Extension. Prince William County, VA.
Bannerman, R. 1994. Diazinon concentrations and toxicity in stormwater ponds. Unpublished Data.
Bureau of Water Management. Wisconsin DNR. Madison, WI.
California Environmental Protection Agency. 1995. Consumer Factsheet: Urban IPM. Department of
Pesticide Regulation. Sacramento, CA.
Center for Watershed Protection (CWP). 1999. Diazinon sources in runoff from the San Francisco Bay
region. Technical Note 106. Watershed Protection Techniques. 3(1): 613-616.
Cohen, S. S. Nickerson, R. Maxey, A. Dupuy and J. Senita. 1990. A groundwater monitoring study for
pesticides and nitrates associated with golf courses on Cape Cod. Groundwater
Monitoring Review. 5: 166-173.
D'Andrea, M and D. Maunder. 1994. Characterization of urban nonpoint source discharges in
metropolitan Toronto.
Dewberry and Davis. 1989. Toxicity of Sediments from BMP Ponds. Final Report. Prepared for
Northern Virginia Planning District Commission. Annandale, VA. 26 pp.
De Young, R. 1997. Healthy lawn and garden survey: data analysis report. Rouge River National Wet
Weather Demonstration Project. Oakland County, MI. 40 pp.
Dindorf, C. 1992. Toxic and hazardous substances in urban runoff. Hennepin Conservation District.
Minnetonka, MN. 98 pp.
Elgin DDB. 1996. Public awareness study: sinnmarv report. The Water Quality Consortium. Seattle,
WA. 24 pp.
Hippe, D, D. Wangsness, E. Frick and J. Garret. 1994. Pesticide monitoring in the Apalac/ucola-
Chattahoocliee-Flint river basin. US Geological Survey. National Water Quality Assessment
Program. Water Resources Investigation Report. 94-118. Atlanta, GA.
Knox, G., A. Fugate and G. Israel. 1995. Environmental landscape management-use of practices by
Florida consumers. University of Florida Cooperative Extension Service. Bulletin 307.
Monticello, FL. 26 pp.
Kroll, J. and D. Murphy. 1994. Pilot monitoring for 14 pesticides in Maryland surface waters.
Dept. of Environment. Chesapeake Bay Program Technical Report. 93-020. 108 pp.
Kroupa and Associates. 1995. Westmorland lawn care survey. Milwaukee. Wisconsin. 12 pp.
Lehner, P., G. Aponte Clarke, D. Cameron, and A. Frank. 1999. Stormwater Strategies: Community
Responses to Runoff Pollution. Natural Resources Defense Council. New York, NY.
Metropolitan Washington Council of Governments (MWCOG). 1983. L'rban runoff in the
Washington metropolitan area: Final NURP report. Department of Environmental
Programs. Washington, DC. 222 pp.
Morris, W. and D. Traxler. 1996. Dakota County subwatersheds: residential survey on lawn care
and water quality. Dakota County, Minnesota, Decision Resources, Ltd.
National Service Research (NSR). 1998. Pesticide usage and impact awareness study: Executive
Summary. City of Forth Worth Water Department. Fort Worth, TX. 44 pp.
Scanlin, J. and A. Cooper. 1997. Outdoor use of diazinon and other insecticides: final draft.
Alameda County Clean Water Program and Alameda County Flood Control and Water
Conservation District. Oakland, CA. 20 pp.
Schueler, T. 1995. Urban Pesticides: From the Lawn to the Stream. Center for Watershed
Protection. Ellicott City, MD. Watershed Protection Techniques. 2(1): 247-253.
Smith, J., S. Paul, C. Collins, A. Cavacas, and M. Lahlou. 1994 Public Survey and Pollutant Model
for Prince George's County. Proceedings from Watershed '93: A National Conference on
Watershed Management. Pawlukiewicz, J., P. Monroe, A. Robertson, and J. Warren (eds).
EPA 840-R-94-002.
Swann, C. 1999. A Sun'ey of Residential Nutrient Behaviors in the Chesapeake Bay. Widener-
Burrows, Inc. Chesapeake Research Consortium. Center for Watershed Protection. Ellicott
City, MD. 112 pp.
Thomas, P. and Scott. McClelland. 1994. NPDES monitoring—Atlanta Georgia Region, in: U.S.
EPA. 1983. Results of the Nationwide Urban Runoff Project. Final Report. Vol 1. Office of
Water. Washington DC.
United States Geological Survey (USGS). 1999. The Quality of Our Nation 's Waters - Nutrients
and Pesticides. U.S. Geological Circular #1225. Web Site Address: uater.usgs.gov.'
Outdoor Material Storage Areas SD-34
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
J Contain Pollutant
Collect and Convey
Description
Proper design of outdoor storage areas for materials reduces opportunity for toxic compounds,
oil and grease, heavy metals, nutrients, suspended solids, and other pollutants to enter the
stormwater conveyance system. Materials may be in the form of raw products, by-products,
finished products, and waste products. The type of pollutants associated with the materials will
vary depending on the type of commercial or industrial activity.
Approach
Outdoor storage areas require a drainage approach different from the typical
infiltration/detention strategy. In outdoor storage areas, infiltration is discouraged.
Containment is encouraged. Preventative measures include enclosures, secondary containment
structures and impervious surfaces.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for
development or redevelopment.
Design Considerations
Some materials are more of a concern than others. Toxic and hazardous materials must be
prevented from coming in contact with stormwater. Non-toxic or non-hazardous materials do
not have to be prevented from stormwater contact. However, these materials may have toxic
effects on receiving waters if allowed to be discharged with stormwater in significant quantities.
Accumulated material on an impervious surface could result in significant impact on the rivers
or streams that receive the runoff.
Material may be stored in a variety of ways, including bulk piles,
containers, shelving, stacking, and tanks. Stormwater
contamination may be prevented by eliminating the possibility of
stormwater contact with the material storage areas either through
diversion, cover, or capture of the stormwater. Control measures
may also include minimizing the storage area. Design requirements
California
Stormwater
Quality
Association
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
1 of 3
SD-34 Outdoor Material Storage Areas
for material storage areas are governed by Building and Fire Codes, and by current City or
County ordinances and zoning requirements. Control measures are site specific, and must meet
local agency requirements.
Designing New Installations
Where proposed project plans include outdoor areas for storage of materials that may contribute
pollutants to the stormwater conveyance system, the following structural or treatment BMPS
should be considered:
• Materials with the potential to contaminate stormwater should be: (i) placed in an enclosure
such as, but not limited to, a cabinet, shed, or similar structure that prevents contact with
runoff or spillage to the stormwater conveyance system, or (2) protected by secondary
containment structures such as berms, dikes, or curbs.
• The storage area should be paved and sufficiently impervious to contain leaks and spills.
• The storage area should slope towards a dead-end sump to contain spills and direct runoff
from downspouts/roofs should be directed away from storage areas.
• The storage area should have a roof or awning that extends beyond the storage area to
minimize collection of stormwater within the secondary containment area. A manufactured
storage shed may be used for small containers.
Note that the location(s) of installations of where these preventative measures will be employed
must be included on the map or plans identifying BMPs.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, increases in gross
floor area and/or exterior construction, and land disturbing activities with 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. If the definition applies, the steps outlined under "designing new installations"
above should be followed.
Additional Information
Stormwater and non-stormwater will accumulate in containment areas and sumps with
impervious surfaces. Contaminated accumulated water must be disposed of in accordance with
applicable laws and cannot be discharged directly to the storm drain or sanitary sewer system
without the appropriate permits.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities in San Diego County, February 14, 2002.
2 of 3 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
www.cabmphandbooks.com
Outdoor Material Storage Areas SD-34
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood
Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures,
July 2002.
January 2003 California Stormwater BMP Handbook 3 of 3
New Development and Redevelopment
www.cabmphandbooks.com
Trash Storage Areas SD-32
_ . .. Design ObjectivesDescription
Trash storage areas are areas where a trash receptacle (s) are Maximize Infiltration
located for use as a repository for solid wastes. Stormwater Provide Retention
runoff from areas where trash is stored or disposed of can be g. R „
polluted. In addition, loose trash and debris can be easily
transported by water or wind into nearby storm drain inlets, Minimize Impervious Land
channels, and/or creeks. Waste handling operations that may be Coverage
sources of stormwater pollution include dumpsters, litter control, Pronibit Dumping of Improper
and waste piles. Materials
/ Contain Pollutants
Appr°aCh Collect and ConveyThis fact sheet contains details on the specific measures required
to prevent or reduce pollutants in stormwater runoff associated
with trash storage and handling. Preventative measures
including enclosures, containment structures, and impervious
pavements to mitigate spills, should be used to reduce the
likelihood of contamination.
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for
development or redevelopment. (Detached residential single-family homes are typically
excluded from this requirement.)
Design Considerations
Design requirements for waste handling areas are governed by Building and Fire Codes, and by
current local agency ordinances and zoning requirements. The design criteria described in this
fact sheet are meant to enhance and be consistent with these code and ordinance requirements.
Hazardous waste should be handled in accordance with legal requirements established in Title
22, California Code of Regulation.
Wastes from commercial and industrial sites are typically hauled by either public or commercial
carriers that may have design or access requirements for waste storage areas. The design
criteria in this fact sheet are recommendations and are not intended to be in conflict with
requirements established by the waste hauler. The waste hauler should be contacted prior to the
design of your site trash collection areas. Conflicts or issues should be discussed with the local
agency.
Designing New Installations
Trash storage areas should be designed to consider the following structural or treatment control
BMPs:
• Design trash container areas so that drainage from adjoining roofs and pavement is diverted
around the area(s) to avoid run-on. This might include berming
or grading the waste handling area to prevent run-on of
stormwater. ^ £ A S Q A
Make sure trash container areas are screened or walled to J!~",^^^ Stormwater
prevent off-site transport of trash. 1^^^ Quality
Association
January 2003 California Stormwater BMP Handbook 1 of 2
New Development and Redevelopment
www.cabmphandbooks.com
SD-32 Trash Storage Areas
• Use lined bins or dumpsters to reduce leaking of liquid waste.
• Provide roofs, awnings, or attached lids on all trash containers to minimize direct
precipitation and prevent rainfall from entering containers.
• Pave trash storage areas with an impervious surface to mitigate spills.
• Do not locate storm drains in immediate vicinity of the trash storage area.
• Post signs on all dumpsters informing users that hazardous materials are not to be disposed
of therein.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, increases in gross
floor area and/or exterior construction, and land disturbing activities with 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. If the definition applies, the steps outlined under "designing new installations"
above should be followed.
Additional Information
Maintenance Considerations
The integrity of structural elements that are subject to damage (i.e., screens, covers, and signs)
must be maintained by the owner/operator. Maintenance agreements between the local agency
and the owner/operator may be required. Some agencies will require maintenance deed
restrictions to be recorded of the property title. If required by the local agency, maintenance
agreements or deed restrictions must be executed by the owner/operator before improvement
plans are approved.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood
Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures,
July 2002.
2 of 2 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
www.cabmphandbooks.com
" o
. o
-. 111CD
Storm Drain Signage SD-13
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
/ Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Waste materials dumped into storm drain inlets can have severe impacts on receiving and
ground waters. Posting notices regarding discharge prohibitions at storm drain inlets can
prevent waste dumping. Storm drain signs and stencils are highly visible source controls that
are typically placed directly adjacent to storm drain inlets.
Approach
The stencil or affixed sign contains a brief statement that prohibits dumping of improper
materials into the urban runoff conveyance system. Storm drain messages have become a
popular method of alerting the public about the effects of and the prohibitions against waste
disposal.
Suitable Applications
Stencils and signs alert the public to the destination of pollutants discharged to the storm drain.
Signs are appropriate in residential, commercial, and industrial areas, as well as any other area
where contributions or dumping to storm drains is likely.
Design Considerations
Storm drain message markers or placards are recommended at all storm drain inlets within the
boundary of a development project. The marker should be placed in clear sight facing toward
anyone approaching the inlet from either side. All storm drain inlet locations should be
identified on the development site map.
Designing New Installations
The following methods should be considered for inclusion in the project design and show on
project plans:
Provide stenciling or labeling of all storm drain inlets and catch
basins, constructed or modified, within the project area with
prohibitive language. Examples include "NO DUMPING -
SQA
California
Stormwater
Quality
Association
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
1 of 2
SD-13 Storm Drain Signage
DRAINS TO OCEAN" and/or other graphical icons to discourage illegal dumping.
• Post signs with prohibitive language and/or graphical icons, which prohibit illegal dumping
at public access points along channels and creeks within the project area.
Note - Some local agencies have approved specific signage and/or storm drain message placards
for use. Consult local agency stormwater staff to determine specific requirements for placard
types and methods of application.
Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.)
define "redevelopment" in terms of amounts of additional impervious area, increases in gross
floor area and/or exterior construction, and land disturbing activities with structural or
impervious surfaces. If the project meets the definition of "redevelopment", then the
requirements stated under " designing new installations" above should be included in all project
design plans.
Additional Information
Maintenance Considerations
m Legibility of markers and signs should be maintained. If required by the agency with
jurisdiction over the project, the owner/operator or homeowner's association should enter
into a maintenance agreement with the agency or record a deed restriction upon the
property title to maintain the legibility of placards or signs.
Placement
• Signage on top of curbs tends to weather and fade.
• Signage on face of curbs tends to be worn by contact with vehicle tires and sweeper brooms.
Supplemental Information
Examples
• Most MS4 programs have storm drain signage programs. Some MS4 programs will provide
stencils, or arrange for volunteers to stencil storm drains as part of their outreach program.
Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County
Department of Public Works, May 2002.
Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of
San Diego, and Cities in San Diego County, February 14, 2002.
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood
Control District, and the Incorporated Cities of Orange County, Draft February 2003.
Ventura Countywide Technical Guidance Manual tor Stormwater Quality Control Measures.
July 2002.
2 of 2 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
•//•//w.ca bmphandbooks.com
Flat grated inlet Curb inlet
FloGard+PLUS® / Product Specifications
The FloGard+PLUS® is a multipurpose catch basin insert designed to capture sediment,
debris, trash & oils/grease from low (first flush) flows.
A (dual) high-flow bypass allows flows to bypass the device while retaining sediment and
larger floatables (debris & trash) AND allows sustained maximum design flows under extreme
weather conditions.
FloGard+PLUS® inserts are available in sizes to fit most industry-standard drainage inlets
(...flat grated, combination, curb and round inlets).
FloGard+PLUS® catch basin inserts are recommended for areas subject to silt and debris as
well as low-to-moderate levels of petroleum hydrocarbon (oils and grease). Examples of such
areas are vehicle parking lots, aircraft ramps, truck and bus storage yards, corporation yards,
subdivision streets and public streets.
Questions? Contact KriStar at (800) 579 8819 4/07
oo
9Q_
FLOGARD+PLUS® FILTER
-INSTALLED INTO CATCH BASIN-
U.S. PATENT # 6,00,023 & 6,877,029
GRATE
"ULTIMATE" BYPASS
FEATURES
GASKET
STAINLESS STEEL
SUPPORT BASKET
Fossil Rock ™
ABSORBENT POUCHES
LINER
SUPPORT
BASKET
CATCH BASIN
(FLAT GRATE STYLE)
NOTES:
EXPLODED VIEW
1. FloGard®+Plus (frame mount) high capacity catch basin inserts
are available in most sizes and styles (see specifier chart, sheet
2 of 2). Refer to the FloGard®+Plus (wall mount) insert for
devices to fit non-standard, or combination style catch basins.
2. Filter insert shall have both an "initial" filtering bypass
and "ultimate" high flow bypass feature.
3. Filter support frame shall be constructed from stainless steel
Type 304.
4. Allow a minimum of 2.0 feet, of clearance between
the bottom of the grate and top of outlet pipe(s), or refer to the
FloGard® insert for "shallow" installations.
5. Filter medium shall be Foss/7 Rock "", installed and
maintained in accordance with manufacturer specifications.
6. Storage capacity reflects 80% of maximum solids collection prior
to impeding filtering bypass.
7. Filtered flow rtrate includes a safety factor of two.
TITLE
®+PLUS
CATCH BASIN FILTER INSERT
(Frame Mount)
FLAT GRATED INLET
KriStar Enterprises, Inc.
P.O. Box 6419, Santa Rosa, CA 95406
Ph: 800.579.8819, Fax: 707.524.8186, www.kristar.com
DRAWING NO.
FGP-0001
V lECO I DATE T
A | 0001 | JPR 09/01/06 | SHEET 1 OF 2
FGP-0001 |"ULTIMATE" BYPASS FEATURE -,
(LOUVERS * OPENINGS) J
SEE DETAIL C /
. L
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"ULTIMATE" BYPASS FEAT
(LOUVERS & OPENING!
INCHES
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DETAIL B
SECTION VIEW
FLO-GARD® +FILTER
-INSTALLED-
5> V\
U.S. PATENT # 6,00,023 & 6,877,029
^ \
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DETAIL C
•^ymfff^tKi^i^l^i^
_ V
I?
S* W
"ULTIMATE"
BYPASS FEATURES
* MANY OTHER STANDARD & CUSTOM SIZES & DEPTHS AVAILABLE UPON REQUEST.
SPECIFIER CHART
MODEL NO.
STANDARD
DEPTH
FGP-12F
FGP-1530F
FGP-16F
FGP-1624F
FGP-18F
FGP-1820F
FGP-1824F
FGP-1836F
FGP-2024F
FGP-21F
FGP-2142F
FGP-2148F
FGP-24F
FGP-2430F
FGP-2436F
FGP-2448F
FGP-28F
FGP-2440F
FGP-30F
FGP-36F
FGP-3648F
FGP-48F
FGP-SD24F
FGP-1836FGO
FGP-2436FGO
FGP-48FGO
STANDARD & SHALLOW
DEPTH
(Data in these columes Is the same lorboth STANDARD & SHALLOW versions)
INLET ID
Inside
Dimension
(inch x inch)
12X12
15X30
16X16
16X24
18X18
16X19
16X22
18X36
18X22
22X22
21X40
19X46
24X24
24X30
24X36
24X48
28X28
24X36
30X30
36X36
36X48
48X48
24X24
18X36
20X36
18X48
GRATE OD
Outside
Dimension
(inch x inch)
12X14
15X35
16X19
16X26
18X20
18X21
18X24
18X40
20X24
22X24
24X40
22X48
24X27
26X30
24X40
26X48
32X32
28X40
30X34
36X40
40X48
48X54
28X28
20X40
24X40
20X54
TOTAL
BYPASS
CAPACITY
(cu. ft.)
2.8
6.9
4.7
5.0
4.7
5.9
5.0
6.9
5.9
6.1
9.1
9.8
6.1
7.0
8.0
9.3
6.3
8.3
8.1
9.1
11.5
13.2
6.1
6.9
8.0
6.3
STANDARD DEPTH
-20 Inches-
SOLIDS
STORAGE
CAPACITY
(cu. ft.)
0.3
2.3
0.8
1.5
0.8
2.1
1.5
2.3
1.2
2.2
4.3
4.7
2.2
2.8
3.4
4.4
2.2
4.2
3.6
4.6
6.8
9.5
2.2
2.3
3.4
2.2
</ii^wflnd +PLUS
CATCH BASIN FILTER INSERT
(Frame Mount)
FLAT GRATED INLET
FILTERED
FLOW
(cu. ft. /sec.)
0.4
1.6
0.7
1.2
0.7
1.4
1.2
1.6
1.0
1.5
2.4
2.6
1.5
1.8
2.0
2.4
1.5
2.3
2.0
2.4
3.2
3.9
1.5
1.6
2.0
1.5
MODEL NO.
SHALLOW
DEPTH
FGP-12F8
FGP-1530F8
FGP-16F8
FGP-1624F8
FGP-18F8
FGP-1820F8
FGP-1824F8
FGP-1836F8
FGP-2024F8
FGP-21F8
FGP-2142F8
FGP-2148F8
FGP-24F8
FGP-2430F8
FGP-2436F8
FGP-2448F8
FGP-28F8
FGP-2440F8
FGP-30F8
FGP-36F8
FGP-3648F8
FGP-48F8
FGP-SD24F8
FGP-1836F8GO
FGP-2436F8GO
FGP-48F8GO
SHALLOW DEPTH
-12 Inches-
SOLIDS
STORAGE
CAPACITY
(cu.ft.)
.15
1.3
.45
.85
.45
1.2
.85
1.3
.7
1.25
2.45
2.7
1.25
1.6
1.95
2.5
1.25
2.4
2.05
2.65
3.9
5.45
1.25
1.3
1.95
1.25
FILTERED
FLOW
(cu. ft. /sec.)
.25
.9
.4
.7
.4
.8
.7
.9
.55
.85
1.35
1.5
.85
1.05
1.15
1.35
.85
1.3
1.15
1.35
1.85
2.25
.85
.9
1.15
.85
— ^- II I^^}I^£"TAI9 1 '
| J^*^" [^^j.'^j'^J
^~TS^r
^^\ i
KriStar Enterprises, Inc.
3.O. Box 6419, Santa Rosa, CA 95406
3h: 800.579.8819, Fax: 707.524.8186, www.kristar.com
DRAWING NO. |<tV lECO OAT!FGP-0001 | A | 0001 JPR 09/01/06 SHEET 2 OF 2
SPECIFIER CHART
MODEL NO.
FGP-24CI
FGP-30CI
FGP-36CI
FGP-42CI
FGP-48CI
FGP-5.0CI
FGP-6.0CI
FGP-7.0a
FGP-8.0CI
FGP-10.0CI
FGP-12.0CI
FGP-14.0CI
FGP-16.0CI
FGP-18.0CI
FGP-21.0CI
FGP-28.0CI
Curb Opening
Width
-w-
2.0' (24")
2.5' (30-)
3.0' (36-)
3.5' (42')
4.01 (48")
5.0' (60")
6.01 (72")
7.0' (84")
8.0' (96")
10.01 (120")
12.0' (144")
14.0' (168")
16.0' (192")
18.01 (216")
21.0' (252")
28.0 (336")
Storage
Capacity
- Cu. Ft. -
.95
1.20
1.50
1.80
2.10
2.40
3.05
3.65
4.25
4.85
6.10
7.30
8.55
9.45
10.95
14.60
Clean
Flow Rate
- GPM/CFS -
33S/.75
450/1.00
563/1.25
675/1.50
768/1.76
900/2.00
1,126/2.51
1,350/3.01
1,576/3.51
1,800/4.01
2,252/5.02
2,700/6.02
3.152 / 7.02
3,490/7.78
4,050/9.02
5,400 / 12.03
FloGard®+Plus
FILTER FRAME
MOUNTING
BRACKET
FILTER LINER &
SUPPORT BASKET.
Tl
OTJ
cb8rO
EXPANSION
BOLT
DETAIL A
MOUNTING BRACKET It EXPANSION BOLTS
SEE NOTE 2
SCALE 6/1
RUBBER GASKETS
FloGard®+Plus CURB
INLET FILTER
ASSEMBLY.
NOTES:
1.FloGard®+PLUS filter inserts shall be installed across the entire
width of curb opening. Storage capacity and dean flow rates are based
on full width installation.
2. Filter insert shall be attached to the catch basin with stainless steel
expansion anchor bolts & washers (3/8" x 2-1/2" minimum length.)
See detail A.
3. Fk>Gard®+PLUS filter inserts are designed with a debris trap/energy
dissipator forthe retention of floatables and collected sediments .
4. Filter support frame shall be constructed from stainless steel Type 304.
5. Filter liner shall be constructed from durable polypropylene, woven,
monofilament, geotextile. Filter liner shall not allow the retention of water
between storm events.
6. Filter inserts are supplied with "clip-in* filter pouches utilizing FOSSIL
ROCK ™ filter medium for the collection and retention of petroleum
hydrocarbons (oils & greases).
7. FloGard®+PLUS filter inserts and FOSSIL ROCK ™ filter medium
pouches must be maintained in accordance with manufacturer
recommendations.
8. FloGard +PLUS filter inserts are available in standard lengths of 24",
30",35", 42" & 48" and may be installed in various length combinations
(end to end) to fit length of noted catch basin.
9. Clean flow rates are "calculated" based on liner flow rate of 140 gallons
per minute per square foot of material, a factor of .50 has been applied to
allow for anticipated sediment & debris loading. An additional safety
factor of between .25 & .50 may be applied to allow for site specific
sediment loading.
10. Storage capacity reflects maximum solids collection prior to impending
"initial" filtering bypass. The "ultimate" high-flow bypass will not become
impeded due to maximum solids loading.
CATCH
BASIN.
CURB
OPENING
SECTION B-B
TOP VIEW
SCALE 1/1
FLO-GARD® CURB INLET
FILTER ASSEMBLY.
FOSSIL ROCK™
ABSORBENT POUCH.
SEE DETAIL A
CURB
OPENING
CATCH
BASIN
FILTER LINER &
SUPPORT BASKET.
OUTLET
SECTION A-A
SIDE VIEW
SCALE 1/1
TITLE
CATCH BASIN FILTER INSERT
(Curb Inlet Style)
KriStar Enterprises, Inc.
P.O. Box 6419, Santa Rosa, CA 95406
Ph: 800.579.8819, Fax: 707.524.8186, www.kristar.com
DRAWING NO.
FGP-0002
REVB ECO
0025 3/20/07
DATE
JPR 11/3/06 SHEET 1 OF 1
COooo
CD
SPECIFIER CHART
MODEL
NUMBER
FGP-RF15F
FGP-RF18F
FGP-RF20F
FGP-RF21F
FGP-RF22F
FGP-RF24F
FGP-RF30F
FGP-RF36F
INLET ID
(0 INCHES)
16
18
21
22
23
24
30
36
GRATE OD
(0 INCHES)
18
20
23
23.5
24
26
32
39
SOLIDS STORAGE
CAPACITY (CU FT)
0.3
0.8
0.8
0.8
0.8
0.8
2.2
3.6
FILTERED FLOW
(CFS)
0.4
0.7
0.7
0.7
0.7
0.7
1.5
2.0
TOTAL BYPASS
CAPACITY (CFS)
2.8
4.7
4.7
4.7
4.7
4.7
6.1
8.1
DIMENSIONS SHOWN ARE APPROXIMATE
GRATE.
(BY OTHERS)
FloGord® +Plus FILTER
INSTALLED.
GRATE FRAME.
(BY OTHERS)
- SUBMIT EXACT MEASUREMENTS WHEN ORDERING
• SEE NOTE 9.
CAN BE MOUNTED ABOVE CONCRETE CATCH BASIN,
CONE REDUCER. SLAB REDUCER, CORRUGATED METAL PIPE. ETC.
(BY OTHERS)
GRATE.
(BY OTHERS)
NOTES:
1. FloGard® +Plus Catch Basin Filter Inserts are available in
standard sizes (see specifier chart) or in custom sizes. Call for
details on custom size inserts.
2. Standard height is 20 inches from top of filter frame to bottom
of support netting. Shallow depths available upon request.
3. Filter support frame shall be constructed from stainless
steel Type 304.
4. Filter liner shall be constructed from durable polypropylene,
woven, monofilament, geotextile. Filter liner shall not allow the
retention of water between storm events.
5. Filter inserts are supplied with "clip-in" filter pouches utilizing
FOSSIL ROCK™ filter medium for the collection and retention
of petroleum hydrocarbons (oils & greases).
6. FloGard®+PLUS filter inserts and FOSSIL ROCK ™ filter medium
pouches must be maintained in accordance with manufacturer
recommendations.
7. Storage capacity reflects 80% of maximum solids collection prior
to impeding filtering bypass.
8. Filtered flow rate includes a safety factor of two.
9. FloGard® measurement charts available upon request.
STAINLESS STEEL
SUPPORT BASKET.
FOSSIL ROCK1" POUCHES.
FILTER LINER &
SUPPORT NETTING.
GRATE FRAME.
(BY OTHERS)
CAN BE MOUNTED ABOVE
CONCRETE CATCH BASIN,
CONE REDUCER. SLAB REDUCER.
CORRUGATED METAL PIPE. ETC.
(BY OTHERS)
EXPLODED VIEW
SCALE: 1/2
TITLE +PLUS
CATCH BASIN FILTER INSERT
(CIRCULAR FRAME MOUNT)
FLAT GRATED INLET
KriStar Enterprises, Inc.
P.O. Box 6419, Santa Rosa, CA 95406
Ph: 800.579.8819, Fax: 707.524.8186, www.kristar.com
DRAWING NO. |REV
FGP-0003 |A 0030 JPR WQ7 SHEET 1 OF 1
Vegetated Buffer Strip TC-31
Design Considerations
• Tributary Area
• Slope
• Water Availability
• Aesthetics
Description
Grassed buffer strips (vegetated filter strips, filter strips, and
grassed filters) are vegetated surfaces that are designed to treat
sheet flow from adjacent surfaces. Filter strips function by
slowing runoff velocities and allowing sediment and other
pollutants to settle and by providing some infiltration into
underlying soils. Filter strips were originally used as an
agricultural treatment practice and have more recently evolved
into an urban practice. With proper design and maintenance,
filter strips can provide relatively high pollutant removal. In
addition, the public views them as landscaped amenities and not
as stormwater infrastructure. Consequently, there is little
resistance to their use.
California Experience
Caltrans constructed and monitored three vegetated buffer strips
in southern California and is currently evaluating their
performance at eight additional sites statewide. These strips were
generally effective in reducing the volume and mass of pollutants
in runoff. Even in the areas where the annual rainfall was only
about 10 inches/yr, the vegetation did not require additional
irrigation. One factor that strongly affected performance was the
presence of large numbers of gophers at most of the southern
California sites. The gophers created earthen mounds, destroyed
vegetation, and generally reduced the effectiveness of the
controls for TSS reduction.
Advantages
• Buffers require minimal maintenance activity (generally just
erosion prevention and mowing).
• If properly designed, vegetated, and operated, buffer strips can
provide reliable water quality benefits in conjunction with
high aesthetic appeal.
Targeted Constituents
0 Sediment i
0 Nutrients <
0 Trash i
0 Metals I
0 Bacteria »
0 Oil and Grease i
0 Organics A
Legend (Removal Effectiveness)
• Low • High
A Medium
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
1 of 8
TC-31 Vegetated Buffer Strip
• Flow characteristics and vegetation type and density can be closely controlled to maximize
BMP effectiveness.
• Roadside shoulders act as effective buffer strips when slope and length meet criteria
described below.
Limitations
• May not be appropriate for industrial sites or locations where spills may occur.
• Buffer strips cannot treat a very large drainage area.
• A thick vegetative cover is needed for these practices to function properly.
• Buffer or vegetative filter length must be adequate and flow characteristics acceptable or
water quality performance can be severely limited.
• Vegetative buffers may not provide treatment for dissolved constituents except to the extent
that flows across the vegetated surface are infiltrated into the soil profile.
• This technology does not provide significant attenuation of the increased volume and flow
rate of runoff during intense rain events.
Design and Sizing Guidelines
• Maximum length (in the direction of flow towards the buffer) of the tributary area should be
60 feet.
• Slopes should not exceed 15%.
• Minimum length (in direction of flow) is 15 feet.
• Width should be the same as the tributary area.
• Either grass or a diverse selection of other low growing, drought tolerant, native vegetation
should be specified. Vegetation whose growing season corresponds to the wet season is
preferred.
Construction/Inspection Considerations
m Include directions in the specifications for use of appropriate fertilizer and soil amendments
based on soil properties determined through testing and compared to the needs of the
vegetation requirements.
• Install strips at the time of the year when there is a reasonable chance of successful
establishment without irrigation; however, it is recognized that rainfall in a given year may
not be sufficient and temporary irrigation may be required.
• If sod tiles must be used, they should be placed so that there are no gaps between the tiles;
stagger the ends of the tiles to prevent the formation of channels along the strip.
• Use a roller on the sod to ensure that no air pockets form between the sod and the soil.
2 of 8 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
www.cabmphandbooks.com
Vegetated Buffer Stri p TC-31
• Where seeds are used, erosion controls will be necessary to protect seeds for at least 75 days
after the first rainfall of the season.
Performance
Vegetated buffer strips tend to provide somewhat better treatment of stormwater runoff than
swales and have fewer tendencies for channelization or erosion. Table i documents the pollutant
removal observed in a recent study by Caltrans (2002) based on three sites in southern
California. The column labeled "Significance" is the probability that the mean influent and
effluent EMCs are not significantly different based on an analysis of variance.
The removal of sediment and dissolved metals was comparable to that observed in much more
complex controls. Reduction in nitrogen was not significant and all of the sites exported
phosphorus for the entire study period. This may have been the result of using salt grass, a warm
weather species that is dormant during the wet season, and which leaches phosphorus when
dormant.
Another Caltrans study (unpublished) of vegetated highway shoulders as buffer strips also found
substantial reductions often within a very short distance of the edge of pavement. Figure i
presents a box and whisker plot of the concentrations of TSS in highway runoff after traveling
various distances (shown in meters) through a vegetated filter strip with a slope of about 10%.
One can see that the TSS median concentration reaches an irreducible minimum concentration
of about 20 mg/L within 5 meters of the pavement edge.
Table 1 Pollutant Reduction in a Vegetated Buffer Strip
Constituent
TSS
NO3-N
TKN-N
Total N3
Dissolved P
Total P
Total Cu
Total Pb
Total Zn
Dissolved Cu
Dissolved Pb
Dissolved Zn
Mean
Influent
(mg/L)
119
0.67
2.50
3-17
0.15
0.42
0.058
0.046
0.245
0.029
0.004
0.099
liflHJ
Effluent
(mg/L)
31
0.58
2.1O
2.68
0.46
0.62
0.009
0.006
0.055
0.007
O.OO2
0.035
Removal
%
74
13
16
15
-••206
•-52
84
88
78
77
66
65
Significance
P
<o.ooo
0.367
0.542
-
0.047
0.035
<o.ooo
<o.ooo
<o.ooo
0.004
0.006
<o.ooo
January 2003 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
3 of 8
TC-31 Vegetated Buffer Strip
100 -
90-
80-
•70-
60-
40-
30-
20-
10-
0-
length
•
C
k
*
#
1 , "
LjJ V Lpl
1 1
T- cc i <q -*
<o
Filter strips also exhibit good removal of litter and other floatables because the water depth in
these systems is well below the vegetation height and consequently these materials are not easily
transported through them. Unfortunately little attenuation of peak runoff rates and volumes
(particularly for larger events) is normally observed, depending on the soil properties. Therefore
it may be prudent to follow the strips with another practice than can reduce flooding and
channel erosion downstream.
Siting Criteria
The use of buffer strips is limited to gently sloping areas where the vegetative cover is robust and
diffuse, and where shallow flow characteristics are possible. The practical water quality benefits
can be effectively eliminated with the occurrence of significant erosion or when flow
concentration occurs across the vegetated surface. Slopes should not exceed 15 percent or be less
than l percent. The vegetative surface should extend across the full width of the area being
drained. The upstream boundary of the filter should be located contiguous to the developed
area. Use of a level spreading device (vegetated berm, sawtooth concrete border, rock trench,
etc) to facilitate overland sheet flow is not normally recommended because of maintenance
considerations and the potential for standing water.
Filter strips are applicable in most regions, but are restricted in some situations because they
consume a large amount of space relative to other practices. Filter strips are best suited to
treating runoff from roads and highways, roof downspouts, small parking lots, and pervious
surfaces. They are also ideal components of the "outer zone" of a stream buffer or as
pretreatment to a structural practice. In arid areas, however, the cost of irrigating the grass on
the practice will most likely outweigh its water quality benefits, although aesthetic
considerations may be sufficient to overcome this constraint. Filter strips are generally
impractical in ultra-urban areas where little pervious surface exists.
Some cold water species, such as trout, are sensitive to changes in temperature. While some
treatment practices, such as wet ponds, can warm stonnwater substantially, filter strips do not
4 of 8 California Stormwater BMP Handbook
New Development and Redevelopment
www.cabmphandbooks.com
January 2003
Vegetated Buffer Strip TC-31
are not expected to increase stormwater temperatures. Thus, these practices are good for
protection of cold-water streams.
Filter strips should be separated from the ground water by between 2 and 4 ft to prevent
contamination and to ensure that the filter strip does not remain wet between storms.
Additional Design Guidelines
Filter strips appear to be a minimal design practice because they are basically no more than a
grassed slope. In general the slope of the strip should not exceed 156;% and the strip should be
at least 15 feet long to provide water quality treatment. Both the top and toe of the slope should
be as flat as possible to encourage sheet flow and prevent erosion. The top of the strip should be
installed 2-5 inches below the adjacent pavement, so that vegetation and sediment accumulation
at the edge of the strip does not prevent runoff from entering.
A major question that remains unresolved is how large the drainage area to a strip can be.
Research has conclusively demonstrated that these are effective on roadside shoulders, where
the contributing area is about twice the buffer area. They have also been installed on the
perimeter of large parking lots where they performed fairly effectively; however much lower
slopes may be needed to provide adequate water quality treatment.
The filter area should be densely vegetated with a mix of erosion-resistant plant species that
effectively bind the soil. Native or adapted grasses, shrubs, and trees are preferred because they
generally require less fertilizer and are more drought resistant than exotic plants. Runoff flow
velocities should not exceed about i fps across the vegetated surface.
For engineered vegetative strips, the facility surface should be graded flat prior to placement of
vegetation. Initial establishment of vegetation requires attentive care including appropriate
watering, fertilization, and prevention of excessive flow across the facility until vegetation
completely covers the area and is well established. Use of a permanent irrigation system may
help provide maximal water quality performance.
In cold climates, filter strips provide a convenient area for snow storage and treatment. If used
for this purpose, vegetation in the filter strip should be salt-tolerant (e.g., creeping bentgrass),
and a maintenance schedule should include the removal of sand built up at the bottom of the
slope. In arid or semi-arid climates, designers should specify drought-tolerant grasses to
minimize irrigation requirements.
Maintenance
Filter strips require mainly vegetation management; therefore little special training is needed
for maintenance crews. Typical maintenance activities and frequencies include:
• Inspect strips at least twice annually for erosion or damage to vegetation, preferably at the
end of the wet season to schedule summer maintenance and before major fall run-off to be
sure the strip is ready for winter. However, additional inspection after periods of heavy run-
off is most desirable. The strip should be checked for debris and litter and areas of sediment
accumulation.
• Recent research on bio filtration swales, but likely applicable to strips (Colwell et al., 2000),
indicates that grass height and mowing frequency have little impact on pollutant removal;
January 2003 California Stormwater BMP Handbook 5 of 8
New Development and Redevelopment
www.cabmphandbooks.com
TC-31 Vegetated Buffer Strip
consequently, mowing may only be necessary once or twice a year for safety and aesthetics
or to suppress weeds and woody vegetation.
• Trash tends to accumulate in strip areas, particularly along highways. The need for litter
removal should be determined through periodic inspection but litter should always be
removed prior to mowing.
• Regularly inspect vegetated buffer strips for pools of standing water. Vegetated buffer strips
can become a nuisance due to mosquito breeding in level spreaders (unless designed to
dewater completely in 48-72 hours), in pools of standing water if obstructions develop (e.g.
debris accumulation, invasive vegetation), and/or if proper drainage slopes are not
implemented and maintained.
Cost
Construction Cost
Little data is available on the actual construction costs of filter strips. One rough estimate can be
the cost of seed or sod, which is approximately 3O<t per ft2 for seed or 704 per ft2 for sod. This
amounts to between $13,000 and $30,000 per acre of filter strip. This cost is relatively high
compared with other treatment practices. However, the grassed area used as a filter strip may
have been seeded or sodded even if it were not used for treatment. In these cases, the only
additional cost is the design. Typical maintenance costs are about $35O/acre/year (adapted
from SWRPC, 1991). This cost is relatively inexpensive and, again, might overlap with regular
landscape maintenance costs.
The true cost of filter strips is the land they consume. In some situations this land is available as
wasted space beyond backyards or adjacent to roadsides, but this practice is cost-prohibitive
when land prices are high and land could be used for other purposes.
Maintenance Cost
Maintenance of vegetated buffer strips consists mainly of vegetation management (mowing,
irrigation if needed, weeding) and litter removal. Consequently the costs are quite variable
depending on the frequency of these activities and the local labor rate.
References and Sources of Additional Information
Caltrans, 2002, BMP Retrofit Pilot Program Proposed Final Report, Rpt. CTSW-RT-oi-oso,
California Dept. ofTransportation, Sacramento, CA.
Center for Watershed Protection (CWP). 1996. Design of Stormwater Filtering Systems,
Prepared for Chesapeake Research Consortium, Solomons, MD, and EPA Region V, Chicago, IL.
Desbonette, A., P. Pogue, V. Lee, and N. Wolff. 1994. Vegetated Buffers in the Coastal Zone: A
Summary Review and Bibliography. Coastal Resources Center. University of Rhode Island,
Kingston, RI.
Magette, W., R. Brinsfield, R. Palmer and J. Wood. 1989. Nutrient and Sediment Removal by
Vegetated Filter Strips. Transactions of the American Society of Agricultural Engineers 32(2):
663-667.
6 of 8 California Stormwater BMP Handbook January 2003
New Development and Redevelopment
www.cabmphandbooks.com
Vegetated Buffer Strip TC-31
Metzger, M. E., D. F. Messer, C. L. Beitia, C. M. Myers, and V. L. Kramer. 2002. The Dark Side
Of Stormwater Runoff Management: Disease Vectors Associated With Structural BMPs.
Stormwater 3(2): 24-39.
Southeastern Wisconsin Regional Planning Commission (SWRPC). 1991. Costs of Urban
Nonpoint Source Water Pollution Control Measures. Technical report no. 31. Southeastern
Wisconsin Regional Planning Commission, Waukesha, WI.
Yu, S., S. Barnes and V. Gerde. 1993. Testing of'Best Management Practices for Controlling
Highway Runoff. FHWA/VA 93-Ri6. Virginia Transportation Research Council,
Charlottesville, VA.
Information Resources
Center for Watershed Protection (CWP). 1997. Stormwater BMP Design Supplement for Cold
Climates. Prepared for U.S. Environmental Protection Agency Office of Wetlands, Oceans and
Watersheds. Washington, DC.
Maryland Department of the Environment (MDE). 2000. Maryland Stormwater Design
Manual, http://www.mde.state.md.us/environment/wma/stormwatennanual. Accessed May
22, 2001.
January 2003 California Stormwater BMP Handbook 7 of 8
New Development and Redevelopment
www.cabmphandbooks.com
I
i
i
i
i
i
TC-31 Vegetated Buffer Strip
Level Spreader
(designs include gravel trenches, sills,
embedded curbs, modular porous
pavement, and stabilized turf strip)
Note: Nat to Scale
8 of 8 California Stormwater BMP Handbook
Mew Development and Redevelopment
www.cabmphandbooks.com
January 2003
BEST ORIGINAL New or Existing
Catch Basin, Curb Cut
or Other Means of
Overflow Relief
Curb and
GutterBioretention
Plant/Soil/Microbe Complex
Removes Pollutants, TSS,
Phosphorous, Nitrogen, Heavy
Metals, Hydrocarbons, etc.
High Flow
"iypass.Fitterra* Flow Line ai-"
Higher £levati<m4fiaij
Bypass Flow'tfnePlant/Tree
Tree Grate
Clean-out
3" Mulch
Root Uptake 5^- Xfi!
Storm Water Inflow
("First Flush")
f Concrete
Filterra*
Container
Engineered
Media ay/Parking Lot
1Biodegradation
Treated Stormwater
Underdrain System
A Growing Idea in Stormwater Filtration.
U.S. Patent «,277,274
«,569,321
Filterra Overview
Stormwater Bioretention Filtration System
Save valuable space with small footprint
for urban sites
Improve BMP aesthetics with attractive trees
or shrubs
Reduce lifetime costs with safer and
less expensive maintenance
Remove Pollutants and Comply with NPDES
Filterra is well-suited for the ultra-urban environment with high removal efficiencies for
many pollutants such as petroleum, heavy metals, phosphorus, nitrogen, TSS and bacteria.
Filterra is similar in concept to bioretention in its function and applications, with the major
distinction that Filterra has been optimized for high volume/flow treatment and high pollutant
removal. It takes up little space (often 0.2% Filter Surface Area/Drainage Area) and may be
used on highly developed sites such as landscaped areas, green space, parking lots and
streetscapes. Filterra is exceedingly adaptable and is the urban solution for Low Impact
Development.
Stormwater flows through a specially designed filter media mixture contained in a landscaped
concrete container. The filter media captures and immobilizes pollutants; those pollutants are
then decomposed, volatilized and incorporated into the biomass of the Filterra" system's
micro/macro fauna and flora. Stormwater runoff flows through the media and into an
underdrain system at the bottom of the container, where the treated water is discharged. Higher
flows bypass the Filterra® via a downstream inlet structure, curb cut or other appropriate relief.
Expected Average Pollutant Removal Rates
(Ranges Varying with Particle Size. Pollutant Loading and Site Conditions)
TSS Removal
Phosphorous Removal
Nitrogen Removal
Heavy Metal Removal
Fecal Coliform
Predicted Oil & Grease
82%
73%
42% - 45%
33% - 82%
57% - 76% *
> 85%
Standard Blend
www.filterra.com
filterra
Table 1: Filterra Quick Sizing Table
(Western Zone - 0.2 in/hr Uniform Intensity Approach)
Available Filterra® Box Sizes
(feet)
4x6.5 or 6.5x4
4x8 or 8x4
Standard 6x6
6x8 or 8x6
6x10 or 10x6
6x1 2 or 12x6
Recommended Commercial
Contributing Drainage Area (acres)
where C = 0.85
up to 0.35
0.36 to 0.44
0.45 to 0.49
0.50 to 0.65
0.66 to 0.82
0.83 to 0.98
Outlet Pipe
4" SDR-35 PVC
4" SDR-35 PVC
4" SDR-35 PVC
4" SDR-35 PVC
6" SDR-35 PVC
6" SDR-35 PVC
Available Filterra® Box Sizes
(feet)
4x6.5 or 6.5x4
4x8 or 8x4
Standard 6x6
6x8 or 8x6
6x10 or 10x6
6x12 or 12x6
Recommended Residential
Contributing Drainage Area (acres)
where C = 0.50
up to 0.60
0.61 to 0.74
0.75 to 0.83
0.84 to 1.11
1.12 to 1.39
1.40 to 1.67
Outlet Pipe
4" SDR-35 PVC
4" SDR-35 PVC
4" SDR-35 PVC
4" SDR-35 PVC
6" SDR-35 PVC
6" SDR-35 PVC
Notes:
1. All boxes are a standard 3.5 feet depth (INV to TC)
2. A standard SDR-35 PVC pipe coupling Is cast into the wall for easy connection to discharge drain
3. Dimensions shown are internal. Please add 1' to each for external (using 6" walls)
4. In line with TR55 data, for Commercial Developments a minimum (runoff coefficient) C factor of 0.85 is
recommended. For Residential Developments, use of C factors less than 0.5 require individual site review by
Filterra.
5. Please ask for Sizing Tables for other target treatment goals, e.g. 0.3 in/hr
6. This sizing table is valid only for CA, NV, AZ, OR, ID, AK & HI
04-13-07 www.filterra. com Toll Free: (877) 345-1450
i i I I I i I i l I i i i i i i i i i I i i i i i i i I i i I i 1 i I
Filterra® Project Process Flowchart - Design to Maintenance
Filterra®
Application
Identified
Yes-
Filterra* Sizing
and Placement
Guidelines from
Americast
Americast Reviews
Site Plan & Filterra*
Project Information
Sheet
Americast Sends
Comments on
Filterra* Placement
and Application \
Filterra* is /
Produced and /
Shipped by /
Americast /
v
Filterra* is
Installed by
Sitework
Contractor
Filterra*
Maintenance
Reports Available
from Americast
upon Request
(Filterra* 7 V Filterra* 7
Maintenance I \ Annual /
Records Stored M \ Maintenance /
in Americast I \ Contract with /
Database \ \ Americast /
\ Filterra* is
Maintained by
Americast for
1 Year
Optional
Continued Filterra*
Maintenance by
Americast
No
Filterra*
Maintenance
by Owner
Engineer Revises
Project Site Design
/"ApprovedX.
4- No — <f by Governing ^> — Yes-^
^Jurisdiction,/
Final Approved
Project Plans
\ Filterra* is /
Design Phase
Americast /
Construction Phase
\ /
1
Maintenance Phase
Bold items indicate services provided by Americast.01/04/05
Included Maintenance
A. Each correctly installed Filterra unit is to be maintained by the Supplier, or a
Supplier approved contractor for a minimum period of 1 year. The cost of this
service is to be included in the price of each Filterra unit. Extended maintenance
contracts are available at extra cost upon request.
B. Annual included maintenance consists of a maximum of (2) scheduled visits. The
visits are scheduled seasonally; the spring visit aim to clean up after winter loads that
may include salts and sands. The fall visit helps the system by removing excessive
leaf litter.
C. Each Included Maintenance visit consists of the following tasks.
1. Filterra unit inspection
2. Foreign debris, silt, mulch & trash removal
3. Filter media evaluation and recharge as necessary
4. Plant health evaluation and pruning or replacement as necessary
5. Replacement of mulch
6. Disposal of all maintenance refuse items
7. Maintenance records updated and stored (reports available upon request)
D. The beginning and ending date of Supplier's obligation to maintain the installed
system shall be determined by the Supplier at the time the system is activated.
Owners must promptly notify the Supplier of any damage to the plant(s), which
constitute(s) an integral part to the bioretention technology.
Design Guidelines for Using Filterra0
1. Do not place in a sump condition. The Filterra cannot be used as a stand alone inlet - it will
need effective bypass during higher intensity rainfall events.
Plans MUST show Filterra Top Curb (TC) and Flow Line (FL) spot elevations and also
bypass TC (where applicable) and bypass FL spot elevations.
The Filterra® TC and FL elevations MUST be higher than the bypass TC and FL elevations for
effective bypass. Use Drawing FLP-2 (p.24) as a detail on the project plans.
2. For proper trash collection ensure a minimum 4" and maximum 6" Filterra® throat opening
depth and use Drawing CGT-04 (p.25) as a detail on the project plans.
3. Do not direct surface flow to the Filterra in a "head-on" configuration. Refer to Guidelines
GU1-A (p.12) and GU2 (p.13) for grading design that encourages flow to enter a Filterra® in a
cross linear flow - left-to-right or right to-left in the gutter in front of the throat, as per a wet
curb which prevents system damage. During extreme storm events the excess flow should
continue past the Filterra® to a bypass inlet or other means of relief. Guideline GU3, Parking
Lot Corners, shows common situations (p. 14).
4. To calculate which size Filterra® is required, use Table 1, Filterra® Quick Sizing Table,
appropriate to the project's geographical region and target treatment regime (p. 11). The entire
contributing drainage area to the Filterra® should be considered and the minimum allowable C
factors noted. The maximum contributing drainage area will vary with site conditions. For
further information relating to sizing, please contact Filterra.
5. To ensure correct installation, include the Standard Filterra® Plan Notes (p.26-27) on your
Filterra® detail project sheet, as well as detailed drawings FLP-2 and CGT-4 (p.24,25).
6. Positive drainage of each Filterra® unit's effluent treatment pipe is required to prevent free
standing water from accumulating in the system or underdrain. This could occur due to tidal
influences or improper connection of Filterra's effluent pipe to a bypass structure or other outfall.
7. Send plans and the completed Filterra® Project Information Form (p.9) to
Americast for Filterra placement review. Plans sheets should include grading, drainage areas,
stormwater schedules or profiles, landscape sheets and Filterra® detail sheets. THIS REVIEW
IS MANDATORY for warranty to apply and helps ensure that each Filterra® system operates
efficiently to maximize performance and minimize maintenance. Our staff also looks for value
engineering opportunities.
Methods of sending information for review are as follows:
Email: design@filterra.com Mail or other:
AutoCAD or PDF files Filterra Review
Fax: (804) 798-8400 34428 Yucaipa Blvd. Ste E-312
Toll Free: (877) 345-1450 Yucaipa, CA 92399
www.filterra.com
Filterra Plant Selections filters
The Filterra Stormwater Bioretention Filtration System harnesses the power of nature to capture,
immobilize and cycle pollutants to treat urban runoff. Trees, grasses and shrubs do more than make
it attractive; they also enhance pollutant removal.
Above ground, the system's shrubs, grasses or trees add beauty and value to the urban landscape.
Underground, nature's complex physical, chemical and biological processes are hard at work
removing a wide range of non-point source pollutants from the treated stormwater. Pollutants are
decomposed, volatilized and incorporated into the biomass of Filterra s micro/macro fauna and flora.
A wide range of plants are suitable for use in bioretention systems, and a list is available indicating
those suitable for use with Filterra®. The selection varies by location according to climate.
Additional photos are available on the website homepage. Some of the most popular selections to
date are shown below:
Filterra® with Heavenly Bamboo Filterra® with Foster Holly
Filterra ^ with Yedda Hawthorn Filterra®' with Crape Myrtle
vvvvw.filterra.com
6"—I
co
I
W -I I-1
tf
PLAN VIEW
CLEANOUT COVER
CAST IN TOP SLAB
TOP SLAB
INTERLOCKING
JOINT
TREE FRAME
I GRATE
CAST IN
TOP SLAB
-LyJ-
PLANT AS SUPPLIED
BY AMERICAST
(NOT SHOWN
FOR CLARITY)
INLET SHAPING
OTHERS)
SDR-35 PVC COUPLING
CAST INTO PRECAST BOX
WALL BY AMERICAST
(OUTLET PIPE
LOCATION VARIES)
(BY OTHERS)
GALVANIZED
ANGLE NOSING
CURB AND GUTTER
(BY OTHERS)
STREET
\_DCWEL BARS
0 12" O.C.
MULCH PROVIDED BY AMERICAST
UNDERDRAIN STONE PROVIDED BY AMERICAST
FILTER MEDIA PROVIDED BY AMERICAST
SECTION A-A
PERFORATED
UNDERDRAIN SYSTEM
BY AMERICAST
DESIGNATION
4 x 6.5
4x8
6x8
6 x 10
6 x 12
L
4'-0"
4'-0"
6'-0"
6'-0"
6'-0"
W
6'-6"
8'-0"
8'-0"
10'-0"
12'-0"
TREE GRATE
QTY & SIZE
(1) 3x3
(1) 3x3
(1) 4x4
(1) 4x4
(2) 4x4
OUTLET
PIPE
4" SDR-35 PVC
4" SDR-35 PVC
4" SDR-35 PVC
6" SDR-35 PVC
6" SDR-35 PVC
MODIFICATIONS OF DRAWINGS ARE ONLY PERMITTED
BY WRITTEN AUTHORIZATION FROM FILTERRA DRAWING AVAILABLE IN TIF FILE FORMAT.
Copyright O 2007 by Americast
DATE: 07-07-06 DWG:FTNL-2
PRECAST FILTERRA® UNIT
NARROW LENGTH CONFIGURATIONUS PAT 6.277,274
AND 6.569.321
Hydroseeding
Standard Symbol
BMP Objectives
• Soil Stabilization
o Sediment Control
o Tracking Control
• Wind Erosion Control
o Non-Storm Water Management
o Materials and Waste Management
Definition and Hydroseeding typically consists of applying a mixture of wood fiber, seed,
Purpose fertilizer, and stabilizing emulsion with hydro-mulch equipment, which
temporarily protects exposed soils from erosion by water and wind. This is one of
five temporary soil stabilization alternatives to consider.
Appropriate • Hydroseeding is applied on disturbed soil areas requiring temporary
Applications protection until permanent vegetation is established or disturbed soil areas
that must be re-disturbed following an extended period of inactivity.
Limitations • Hydroseeding may be used alone only when there is sufficient time in the
season to ensure adequate vegetation establishment and erosion control.
Otherwise, hydroseeding must be used in conjunction with a soil binder or
mulching (i.e., straw mulch), refer to BMP SS-5, Table 1 for options.
• Steep slopes are difficult to protect with temporary seeding.
• Temporary seeding may not be appropriate in dry periods without
supplemental irrigation.
• Temporary vegetation may have to be removed before permanent vegetation
is applied.
• Temporary vegetation is not appropriate for short-term inactivity.
Caltrans Storm Water Quality Handbooks
Construction Site Best Management Practices Manual
March 1, 2003
Section 3
Hydroseeding SS-4
1 of 3
Hydroseeding
Standards and To select appropriate hydroseeding mixtures, an evaluation of site conditions shall
Specifications be performed with respect to:
- Soil conditions - Maintenance requirements
- Site topography - Sensitive adjacent areas
- Season and climate - Water availability
- Vegetation types - Plans for permanent vegetation
• Selection of hydroseeding mixtures shall be approved by the District
Landscape Architect and the Construction Storm Water Coordinator.
The following steps shall be followed for implementation:
• Seed mix shall comply with the Standard Specifications Section 20-2.10, and
the project's special provisions.
• Hydroseeding can be accomplished using a multiple-step or one-step process;
refer to the special provisions for specified process. The multiple-step
process ensures maximum direct contact of the seeds to soil. When the one-
step process is used to apply the mixture of fiber, seed, etc., the seed rate shall
be increased to compensate for all seeds not having direct contact with the
soil.
• Prior to application, roughen the slope, fill area, or area to be seeded with the
furrows trending along the contours. Rolling with a crimping or punching
type roller or track walking is required on all slopes prior to hydroseeding.
Track walking shall only be used where other methods are impractical.
• Apply a straw mulch to keep seeds in place and to moderate soil moisture and
temperature until the seeds germinate and grow, refer to Standard
Specifications Sections 20-2.06 and 20-3.03.
• All seeds shall be in conformance with the California State Seed Law of the
Department of Agriculture. Each seed bag shall be delivered to the site sealed
and clearly marked as to species, purity, percent germination, dealer's
guarantee, and dates of test; provide the Resident Engineer (RE) with such
documentation. The container shall be labeled to clearly reflect the amount of
Pure Live Seed (PLS) contained. All legume seed shall be pellet-inoculated.
Inoculant sources shall be species-specific and shall be applied at a rate of 2
kg of inoculant per 100 kg of seed (2-lb inoculant per 100-lb seed), refer to
Standard Specifications Section 20-2.10.
• Commercial fertilizer shall conform to the requirements of the California
Food and Agricultural Code. Fertilizer shall be pelleted or granular form.
Caltrans Storm Water Quality Handbooks Section 3
Construction Site Best Management Practices Manual Hydroseeding SS-4
QlHmna March 1, 2003 2 of 3
Hydroseeding SS-4J
• Follow-up applications shall be made as needed to cover weak spots, and to
maintain adequate soil protection.
• Avoid over-spray onto the traveled way, sidewalks, lined drainage channels,
and existing vegetation.
Maintenance and • All seeded areas shall be inspected for failures and re-seeded, fertilized, and
I nspection mulched within the planting season, using not less than half the original
application rates. Any temporary revegetation efforts that do not provide
adequate cover must be reapplied at a scheduled recommended by the
Caltrans Landscape Architect or RE.
• After any rainfall event, the Contractor is responsible for maintaining all
slopes to prevent erosion.
Caltrans Storm Water Quality Handbooks Section 3
Construction Site Best Management Practices Manual Hydroseeding SS-4
March 1, 2003 3 of 3
IT
POST CONSTRUCTION BMP
TRIBUTARY AREA MAP
EL CAMINO TERRACE
PARCEL 3 OF PARCEL MAP 18059
\\A/\\\
, ,. \ \ \
FILTERRA BIORETENTION FILTRATION SYSTEM
FILTERRA BIORETENTION
FILTRATION SYSTEM''
, AREA= 0.35 AC
12"X 12" AREA DRAIN
FILTER INSERT
AREA= 0.05 AC
24 X 24 CATCH BASIN
FILTER INSERT
AREA= 0.20 AC
12"X 12" AREA DRAIN
FILTER INSERT
AREA= 0.06 AC
4' CURB(INLET
FILTER INSERT-
AREA= 0.l'6~AC
IF PLAN SIZE IS LES& THAN Il"xl7",
THIS IS A REDUCED COPY.
SCALE PLAN ACCORDINGLY.
SCALE: 1"= 30'
W;\data-W\PRDJE:CTS-W\05-062\DWG\CT 06-17\05-062-filterra-area.dwg 10/23/2007 9:55:15 AM PDT
ATTACH MENTC
Storm Water Applicability Checklist
Storm Water Standards
4/03/03
VI. RESOURCES & REFERENCES
APPENDIX A
STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST
Complete Sections 1 and 2 of the following checklist to determine your project's
permanent and construction storm water best management practices requirements.
This form must be completed and submitted with your permit application.
Section 1. Permanent Storm Water BMP Requirements:
If any answers to Part A are answered "Yes," your project is subject to the "Priority
Project Permanent Storm Water BMP Requirements," and "Standard Permanent Storm
Water BMP Requirements" in Section III, "Permanent Storm Water BMP Selection
Procedure" in the Storm Water Standards manual.
If all answers to Part A are "No," and any answers to Part B are "Yes," your project is
only subject to the "Standard Permanent Storm Water BMP Requirements". If every
question in Part A and B is answered "No," your project is exempt from permanent
storm water requirements.
Part A: Determine Priority Project Permanent Storm Water BMP Requirements.
Does the project meet the definition of one or more of the priority project
categories?*
1 . Detached residential development of 1 0 or more units
2. Attached residential development of 1 0 or more units
3. Commercial development greater than 100,000 square feet
4. Automotive repair shop
5. Restaurant
6. Steep hillside development greater than 5,000 square feet
7. Project discharging to receiving waters within Environmentally Sensitive Areas
8. Parking lots greater than or equal to 5,000 fr* or with at least 1 5 parking spaces, and
potentially exposed to urban runoff
9. Streets, roads, highways, and freeways which would create a new paved surface that is
5,000 square feet or greater
Yes
X
X
No
>^X
X
X
><
X
X.
* Refer to the definitions section in the Stom? Water Standards for expanded definitions of the priority
project categories.
Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered
priority projects. Parking lots, buildings and other structures associated with utility projects are
priority projects if one or more of the criteria in Part A is met. If all answers to Part A are "No",
continue to Part B.
30
Storm Water Standards
4/03/03
Part B: Determine Standard Permanent Storm Water Requirements
Does the project propose:
1 . New impervious areas, such as rooftops, roads, parking lots, driveways, paths and
sidewalks?
2. New pervious landscape areas and irrigation systems?
3. Permanent structures within 1 00 feet of any natural water body?
4. Trash storage areas?
5. Liquid or solid material loading and unloading areas?
6. Vehicle or equipment fueling, washing, or maintenance areas?
7. Require a General NPDES Permit for Storm Water Discharges Associated with
Industrial Activities (Except construction)?*
8. Commercial or industrial waste handling or storage, excluding typical office or
household waste?
9. Any grading or ground disturbance during construction?
1 0. Any new storm drains, or alteration to existing storm drains?
Yes
X
X
;x
x:
,x
No
><-
X
X
X
X
To find out if your project is required to obtain an individual General NPDES Permit for Storm Water
Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site
at, www.swrcb.ca.gov/stormwtr/industrial.html
Section 2. Construction Storm Water BMP Requirements:
If the answer to question 1 of Part C is answered "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Storm Water Pollution Prevention Plan (SWPPP). If the answer to question 1 is "No,"
but the answer to any of the remaining questions is "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No,"
your project is exempt from any construction storm water BMP requirements. If any of
the answers to the questions in Part C are "Yes," complete the construction site
prioritization in Part D, below.
Part C: Determine Construction Phase Storm Water Requirements.
Would the project meet any of these criteria during construction?
1 . Is the project subject to California's statewide General NPDES Permit for Storm Water
Discharges Associated With Construction Activities?
2. Does the project propose grading or soil disturbance?
3. Would storm water or urban runoff have the potential to contact any portion of the
construction area, including washing and staging areas?
4. Would the project use any construction materials that could negatively affect water
quality if discharged from the site (such as, paints, solvents, concrete, and
stucco)?
Yes
X
X
X,
X
No
31
Storm Water Standards
4/03/03
Part D: Determine Construction Site Priority
In accordance with the Municipal Permit, each construction site with construction storm
water BMP requirements must be designated with a priority: high, medium or low.
This prioritization must be completed with this form, noted on the plans, and included in
the SWPPP or WPCP. Indicate the project's priority in one of the check boxes using the
criteria below, and existing and surrounding conditions of the project, the type of
activities necessary to complete the construction and any other extenuating
circumstances that may pose a threat to water quality. The City reserves the right to
adjust the priority of the projects both before and during construction. [Note:
The construction priority does NOT change construction BMP requirements that apply
to projects; all construction BMP requirements must be identified on a case-by-case
basis. The construction priority does affect the frequency of inspections that will be
conducted by City staff. See Section IV. 1 for more details on construction BMP
requirements.]
Q A) High Priority
1) Projects where the site is 50 acres or more and grading will occur during the
rainy season
2) Projects 5 acres or more. 3) Projects 5 acres or more within or directly
adjacent to or discharging directly to a coastal lagoon or other receiving water
within an environmentally sensitive area
Projects, active or inactive, adjacent or tributary to sensitive water bodies
B) Medium Priority
1) Capital Improvement Projects where grading occurs, however a Storm Water
Pollution Prevention Plan (SWPPP) is not required under the State General
Construction Permit (i.e., water and sewer replacement projects, intersection
and street re-alignments, widening, comfort stations, etc.)
2) Permit projects in the public right-of-way where grading occurs, such as
installation of sidewalk, substantial retaining walls, curb and gutter for an
entire street frontage, etc. , however SWPPPs are not required.
3) Permit projects on private property where grading permits are required,
however, Notice Of Intents (NOIs) and SWPPPs are not required.
C) Low Priority
1) Capital Projects where minimal to no grading occurs, such as signal light and
loop installations, street light installations, etc.
2) Permit projects in the public right-of-way where minimal to no grading occurs,
such as pedestrian ramps, driveway additions, small retaining walls, etc.
3) Permit projects on private property where grading permits are not required,
such as small retaining walls, single-family homes, small tenant
improvements, etc.
32