HomeMy WebLinkAboutCT 04-01; YAMAMOTO SUBDIVSION POINSETTIA RIDGE; AMENDMENT TO STORM WATER MANAGEMENT PLAN; 2010-05-20I
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Storm Water Management Plan (SWMP)
tYJjJIJIJJJ Poinsettia Ridge, CT 04-01
Engineering
Contents
I SECTION 1 INTRODUCTION 1
SECTION 1.01 INTRODUCTION 1
2..: VICINITY MAP I SECTION 2
SECTION 3. PROJECT......................................................................... ................................................................................
:SECTION 3.01 DESCRIPTION.. ...............................................................................................3
I SECTION 3.02 TOPOGRAPHY AND LAND USE ...........................................................................................................................3
SECTION 4. SITE MAO ........... ............................................................ .................................... ................................................ 4
I SECTION 5 IDENTIFICATION OF POLLUTANTS OF CONCERN S
SECTION 5.01 ANTICIPATED POLLUTANTS................................................................: .......5
SECTION 5.02 RECEIVING WATERS ..................................................................................................................................... 7 I ..
5.02.1 Beneficial Uses ..... :...................................................................................................................................... 7
5.02.1(i) Beneficial Use Inland Surface Waters;................................................... ............................................................ 9
5.02.1(u) Beneficial Uses for Groundwater ..................................... ........................................ .................................................. 9
I .. SECTIONS 03
SECTION 5.04
303(b) STATUS .............................................................: ........g
PRIMARY AND SECONDARY POLLUTANTS OF CONCERN 9
SECTION 6.. CONDITIONS OF CONCERN 10
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SECTION 6.01 EXISTING AND POST CONSTRUCTION DRAINAGE ......................:;...:........................................................................10
SECTION 602 SOIL CHARACTERISTICS 11
SECTION 6.03 DOWNSTREAM CONDITIONS OF CONCERN ..................................................................................... .......................12
I SECTION 7. LID SITE DESIGN BMPS ................................................................................................................................. 12
SECTION 7.01 MAINTAIN PRE-DEVELOPMENT RAINFAL RUNOFF CHARACTERISTICS ............... .. ................................... ..........................12
: 7.01.1
7.01.2
BMP-i Minimize) m.:p:erv.io -us Areas ........... :.•..........................................................
BMP-2 Conserve Natural Areas ... ...................................... ....................................................................... • .....13
12
701.3 BMP 3 Minimize Directly Connected Impervious Areas 13
701 4 BMP 4 Maximize Canopy Interception 13
. : SECTION 7.02 PROTECT SLOPES AND CHANNELS ......................................................................................................................14 I 7.02.1 BMP-5 Convey Runoff Safely from the Tops of Slopes ..............:.................................................................14
7.02.2 BMP-6 Vegetate Slopes with Native of Drought Tolethnt. Vegetation .......................................................14
I 702.3
7.02.4
BMP 7 Stabilize Permanent Channel Crossings
BMP-8 Energy Dissipators .........................................................................................................................
14
14
7.02.5 BMP-9 Minimize disturbances to natural drainages.....;.... ...................................................................... 14
I : . SECTIONS.. SOURCE CONTROL BMPS ............................................................................................................................14
SECTION 8.01 OUTDOOR MATERIAL STORAGE AREAS ...............................................................................................................14
SECTION 8.02 ..•........... . ...................... . ........................................ ..15 TRASH STORAGE:AREAS ................... . ....... . ......................
I SECTION 8.03
8.03.1 .
INTEGRATED PEST MANAGEMENT SYSTEMS .......................................................................................................15
BMP-12 Reduce .Pesticide Use...............................: ...15
8.03.2 BMP-13 Educational Material ................................. ....................................... ................................................. 15
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I vrr ) Storm Wafer Management Plan (SWMP)
tYJIILJJJIIJJJ Poinsettia Ridge CT 04-01
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SECTION 8..04 EFFICIENT IRRIGATION SYSTEMS AND LANDSCAPE DESIGN 16
8.04.1 BMP-14 Rain Shutoff bevices..... ................................... :.: .................................. ..'.'. :. ......16
8 04 2 BMP 15 Landscape and irrigation Design 16
8.04.3 : BMP16 Flow Reducers orShutoff Valves................ .......................:.......................................:;.::................16
I SECTION 8.05
8051
STORM WATER CONVEYANCE SYSTEM STENCILING AND SiGNAGE 16
BMP 17 Catch Basin Stenciling 16
SECTION 9 BMPS APPLICABLE TO INDIVIDUAL PRIORITY PROJECT CATEGORIES 16
SECTION 9 01 RESIDENTIAL DRIVEWAYS AND GUEST PARKING 17 I 9 01 1 BMP 20 Driveway Design 17
'61.2 9 Uncovered Guest Parking 17
I SECTION 10 TREATMENT CONTROL BMP'S 17
SECTION 11 STORM WATER BMP MAINTENANCE 17
I SECTION 12. SUMMARY CONCLUSIONS .................................................................................................. ....................... 17
SECTION 13 CERTIFICATION 18
I Attachment A-, Site Plan A-1
Attachment B- Computation Sheet forRunoff'Coefficients........... ............................................................. ' ..B-i
Attachment C Drainage Study C-1
Attachment D Storm Water Standards Questionnaire D-1
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Section 1. Introduction
Section 1 01 Introduction
This SWMP is an amendment to the original SWMP prepared for the construction of the
improvements: for the Yamamoto Property:Sübdivision (CT 04-01), which were completed
in 2008 This project is being updated and resubmitted to the City of Carlsbad for the
purposes of constructing the homes.on the 16 lots and complying with the current SUSMP
requirements.: .
The purpose of this SWMP is to address the water quality impacts from the proposed
improvements on the Poinsettia Ridge formerly the Yamamoto Property Subdivision (CT
04-01). Best Management Práctibes (BMPs).ill be utilized to:rovidë a long-term solUtion
to water quality. This SWMP is also intended to ensure the effectiveness of the BMPs
through proper maintenance that is based on long-term fiscal planning
"The requirement to implement storm water BMP requirements for development projects is
based on Section 402 (p) of the CleanWaterAct. The Federal Clean Water Act
amendments of 1.987 established .a framework for regulating storm water discharges from
municipal industrial and construction activities under the NPDES program Under the
Federal Clean Water Act municipalities throughout the nation are
issued a Municipal NPDES Permit The primary goal of the Municipal Permit is to stop
polluted discharges from entering the storm water conveyance system and local
receiving and coastal waters. lnCalifornia,theStäte Water: Resources Control Board
(SWRCB), through the nine RegiOnal Boards, administers the NPDES storm water municipal
permitting program Based on the San Diego MunicipalPermit issued by the San Diego
Regional Board the City is required to develop and implement permanent storm water
BMPs addressing pollution from new development projects
The City of Carlsbad's Storm Water Management and Discharge Control Ordinance
(Carlsbad Municipal Code Chapter 15.12), réquirés that all new development and
redevelopment activities comply with the storm water pollution prevention requirements
These storm water pollution prevention requiremenfs, which are described in detail in
Section 23 "Permanent Storm Water Best Management practices Selection Procedure"
are site specific and vary based on the project's potential impact on receiving water
quality"
By definition, detached residential projects of more than 10 units, of which the Poinsettia
Ridge project is one are classified as "priority projects" See the City of Carlsbad's
Sformwater Standards Questionaire in Attachment D.
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Section 3.01: Description
The project..is g five acre site located Within the 16 lot Carlsbad Tract No. 04-01
Subdivision in the City of Carlsbad California
The site is bordered by Black Rail Road to the West Songbird Avenue and CT 00-13 to
the North CT 99-10 to the South and CT 92-3 to the East
The site is adjacent to single family: homes on South, East and North.: The site is
adjacent to agricultural land to the West
The: proposed project will place 1:6 single family residences on the existing building
pads put in place as part of the grading plan for CT 04-01. Street and utility ,
improvements are existing as well The amount of anticipated grading is
approximately 800 cubic yards for forms and footings as the pads will remain at their
existing grade.
SectiOn 3.02 Topography and Land Use
The site is currently vacant with 16 graded pads There are two paved streets on site
which: were built to serve the project. Half of the Odds of the subdivision :front along
Thrasher Place and the other half of the pads front along Surf Crest Avenue.. Storm
water runoff from the Lots fronting along Thrasher Place will either enter an:existing
storm drain catch basin at the southerly end of Thrasher. Place which takes the runoff,
out to a catch basin on the easterly side of Black Rail Road or will enter an existing
gunite ditch that runs along the southerly subdivision boundary and curb outlets onto
Black Rail Road From there it continues southerly along Black Rail Road to a storm
drain inlet 400 feet southerly of the site The storm drain system outlets to a natural
drainage area southwesterly of the intersection of Black Rail Road and Aviara.
Parkway, approximately 1500 feet southwesterly of the project site.
The lots fronting Surf Crest Avenue will have their runoff drained to Surfcrest and carried
northerly to Songbird Avenue The remainder of the slopes along the easterly
subdivision boundary drain to an existing gunite ditch along the easterly, property line,
then northerly to Songbird Avenue. Once: .in.Songbird Avenue, runoff continues
northerly , and easterly, along Cabello Pldcè, and Docena Road to a storm drain
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.Section&: Identification of Pollutants of Concern.: I Section 5 01 Anticipated Pollutants
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Table 1: Anticipated and Potential Pollutants Generated by Land Use Type
General Pollutant Categories
Priority Oxygen
I Project Heavy Organic Trash & Demanding Oil & Bactena
COtegories Sedi me: hts Nutrients Mètdls Compounds Debris Substances Gréäse• Viruses - Pétiöidès
Detached I Residential X .X X. • X X X
Development . . .. . . •
ttached
I .. Residential.: . .X X:: .X P(J:).: P(2) -P .. 'X
: :. :. m Develooent :. : . ...... . ..:: :. •: ' . .... : •: . : ..: ::
Commercial
Development P(1) P(1) P(2) X P(5) X P(3) P(5)
I >100,000ft2
Automotive-:.X(4)(5) Repair Shops
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Restaurants 4 X X X X
.: . : Hillside .... . :: .... : . . .. .:. •. . . .- . Development X X X X X . X
>5000ft2
I...__ ...•... ':.
P(1) P(1) x x P(1) X P(1)
Parking Lots:.: :. : ::: • :: - ::.:: ;. •• : : ________
Streets, • . : : . . :: • . . . :': • I H w ighays & X P(1) X X(4) X P(5) X
U Freeways.. . .. ... . . ....•
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. HX anticipated I :. :::',. : •. ......1 . :H
P = potential
(1) A potential pollutant if landscaping exists on-site
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(2) A potential pollutant if the project includes uncovered parking areas
A potential pollutant if land use involves food or animal waste products
Including petroleum hydrocarbons
Including solvents
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The anticipated pollutants for a residential development like this as identified in Table
I l above are
. Sediment Sediments are soiLs or other, surf icial materials eroded and then
I transported or deposited by the action of wind water ice or gravity Sediments
can.increase turbidity", urbidity clog fish gills redice spawning habitat lower-young
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dquatic.organisms survival rates, smother bottom dwelling organisms, and
suppress aquatic vegetation growth.
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.
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 and debris may have a significant impact on the recreational
value of a water body and aquatic habitat. Excess organic matter can create a
high biochemical 'oxygen demand in a stream and thereby lower its water
quality. In addition, in areas where stagnant water exists, the presence of excess
organic matter can,promote septic conditions resulting in the growth of
undesirable organisms and the release of odorous and hazardous compounds
such as hydrogen sulfide.
Oxygen Demanding Substances: This category includes biodegradable organic
material as well as chemicals that react with dissolved oxygen in water to form
other compounds. Proteins, carbohydrates, and fats are examples of
biodegradable organic compounds. Compounds such as ammonia and
hydrogen sulfide are examples of oxygen-demandihg compounds. The oxygen
demand of a substance can lead to depletion of dissolved oxygen in a water
body and possibly the development of septic conditions.
Oil & 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.
Bacteria & Virus: Pathogens (bacteria and viruses) are ubiquitous
microorganisms that thrive under certain environmental conditions. Their
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Please provide the hydrOlogic'sub-area and
NUmber •. Name
904.51 .. Bdtiquitos
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I Storm Water Management Plan (SWMP)
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proliferation is typically caused by the transport of animal or human fecal wastes
I from the watershed Water containing excessive bacteria and viruses can alter
the aquatic habitat.and.create a.harmful environment for humans and aquatic
life: Also, the decomposition of excess organic waste:causes increased growth
I of undesirable organisms in the water.
. Pesticides Pesticides (including herbicides) are chemical compounds
I commonly used to control nuisancëgrowth.or.prevblence of organisms.
Excessive or imoper applia'tion of a pesticide may resultih runoff containing
toxic levels of its active ingredient.-
Section. 5.02,Receiving Waters
Please check the watershed(s) for:the project:
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iJrnber(s) ..
5.02.1 : Beneficial Uses'. . . .. ..
The beneficial uses for the hydrologic unit are included in Tables 3 1 and 3 2 below
These tables have been extracted fron the Water Quality. Control Plan for the San
I. Diego Basin. The beneficial uses are defined as follows:
. MUN- Municipal and Domestic Supply: Includes uses :of water for community,
military, or individual water supply systems including but not limited to drinking I water supply.
AGR Agricultural Supply: Includes uses of water for farming, horticulture, or
I. ranching including, but not limited to, irrigation, stock watering, or support of
vegetation for range grazing. .
1 • IND. Industrial Services Supply: Includes uses of water fOr: indUstrial activities that do
not depend primarily on water quality including, but, not limited to, mining, cooling
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San Juan Santa Margarita - San LUis Rey X Carlsbad
San Dieguito Penasquitos San Diego Pueblo San Diego
Sweetwater . .Otay Tijuana
.StÔflh Water Mandgement Plan (SWMP KID), Poinsettia Ridge, CT 04-01
Engineering ..:. ..
water supply, hydraulic conveyance gravel washing fire protection or oil well re-
pressurization
BlOt - Preservation of Biological Habitats of Special Significance: Includes uses of
water that support designated areas or habitats. .
EST- Estuarine Habitat: Includes uses of water that support estuarine ecosystems,
including but not limited to preservation.or.enhancement.of estuarine habitats,
vegetation, fish, shellfish, or wildlife.
.
.
MAR- Marine Habitat: Includes uses ofwater. that support marine ecosystems,-
including but not limited to preservation or enhancement of marine habitats,
vegetation fish shellfish or wildlife
MIGR- Migration of Aquatic Organisms Includes uses of water that support habitats
necessary for migration, acclimatization between fresh and salt water, or other.
temporary activities by aquatic organisms, such as anadramous fish.
RARE- Rare, threatened or endangered species; Includes uses .of water necessary,
al least in part, for the survival and successful maintenance of plant or animal
species established under State or Federal Law as rare, threatened or endangered.
RECII Contact Recreation: Includes uses of water for recreational activities
involving body contact with water, where ingestion of water is reasonably possible
These uses include, but are not limited to, swimming, wading, water-skiing, skin and
SCUBA diving, surf ing, white water activities, fishing, or use of natural hot springs.
REC2-- Non-Contact Recreation: Includes the uses of wciter for recreational
involving proximity to water, but not normally involving body contact with water,
where ingestion of water is reasonably possible: These uses include, but are not
limited to., picnicking, sunbathing, hiking, camping, boating, tide pool and marine
life study, hunting, sightseeing, or aesthetic enjoyment in conjunction with the
above activities. • .'•
SPWN-. Spawning, rep'roduôtion or early: development: Includes uses of'water that
support high.quality aquatic habitats suitable for reproduction.and early
development of fish. . . .
WILD- Wildlife Habitat: Includes uses of water that support terrestrial ecosystems
including, but, not limited to, preservation and enhancement of terrestrial habitats,
vegetation., wildlife, (e.g., mammals, birds, reptiles, amphibians, invertebrates), or
wildlife water and food sources.
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I Table 3 1- Beneficial Uses for Inland _Surface _Waters ___
Hydrologic Unit
c1:Z: z : . .: o '— 0 0 — UJ IU Q
_: : LU :H ',)3-1
1 904.51
Existing Beneficial Use
I 5.02.1011):: Beneficial Uses for Groundwater
The ground water for this project has the following beneficial uses as shown in Table
I Table_32_-_Beneficial_ Use sfor Groundwater
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Hydrologic Unit..
Z LU
"N •z
LU LU7, CL — LU
1 90451
Existing Beneficial Use
I Section 5.03:. 303(d) Status
I According to the California 2006:303(d) list published by the San Diego Regional Water
Quality Control Board the water bodies that are associated with this project i.e. the
Batiquitos: Lqgoon, are not impaired.
Section 504 Primary and Secondary Pollutants of Concern
As there are no impaired waters downstream of the project there are no primary
P:0t1t5 of concern.Secondary pollutants of cóhcerri would be: the anticipated :
pollutants identified in Section 5 01
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Table,4.1 —Impervious, Areas & Runoff Coefficients
Construction site area 5 5.0 acres
Percentage impervious area before: construction 6 %
Runoff coefficient before construction (1) . 0.38
Percentage impervious area after construction 40 %
Runoff coefficient after construction (1) 0.57
Anticipated off-site storm water flow on to the
construction site 0 cfs
(1) Calculations are shown in Attachment B.
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Section 6. Conditions ofConcern
Section 6.01: Existing and Post Construction Drainage
The streets and grading and drainage improvements for the residences have already
been constructed in the first phase of the project This amendment adds the
construction of houses on the existing building pads and will not alter drainage
patterns on the site or the surrounding area The Storm water discharge points will not
divert runoff from existing conditions
Approximately 0.9 acres of open ground will be covered by the single-family
residences and appurtenant driveways This area plus the approximately 1 1 acres of
previously paved streets and sidewalks will make a total of 20 acres of impervious
surfaces on the site Thus the impervious area on the site will increase from 0.31 acres
in the original undeveloped condition to 2Q acres after completed development, or
from approximately 6% to 40% impervious area;
This change in land use will increase the composite runoff coefficient, of the project,
from C=038 to C=0.57. Also the total peak 10 year storm flow rate will increase from
6.0 cfs under the. undeveloped condition to7.3 cfs. under the proposed condition. A
detailed description of the drainage patterns and flowsare discussed in the Drainage
Report submitted to the City of Carlsbad for this development. A copy of this report is
included in Attachment C to this report. See Table 4.1 and Attachment B for
Impervious area calculations. . S
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The runoff from this site both in the existing state and the proposed development is
I directed to two distinct outflows Both outflows lead to natural drainage areas via
paved streets and storm drain systems The existing natural environment serves as a
b,o-filter for the runoff generated from the area
I Each residential lot will incorporate the following post construction BMP's to reduce
and treat the amount of storm runoff leaving the site
I . Vegetated Swales will be incorporated in to the yard drainage system for each
lot, treating the roof: and yard runoff before it leaves each lot:
.A strip of pervious interlocking: pavingblocks shall. be Utili±ed:at.the downstream
end of the driveways for each lot where the driveway drains to the street to
I reduce and break up the impervious area created by the subdivision and
increase infiltration.• . . . . . . .
Refer tothe Site Map in Attachment A forpost construction: BMP locations.:.
Summaries of the post-construction water quality flows are included in Table 42 The
I flows were developed using a Precipitation of 02 inches per hour per the San Diego
County SUSMP Manual Dated March 25 2010 See Attachment :C for excerpt
(1) Calculations are shown in Attachment C
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Section 6.02: Soil Characteristics
The project area consists of soil group D with a saturated infiltration rate of from 0.00 to
I 0 05 in /hr The project will not have slopes steeper than 2-1 All slopes will include
slope protection such as berms or brow ditches at the tops of slopes and landscaping
and irrigation to limit the potential for erosion (Note Information regarding soils group
I infiltration rates is from the County of San Diego Guidelines for Determining
Significance for Surface Water Quality. See Attachment B for excerpt
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Section 6 03 Downstream Conditions of Concern
Downstream of the project site the storm water runoff will be conveyed either by a city
maintained storm drain system or a natural drainage channel until it reaches the
Batiquitos Lagoon The outlets for the city storm drains are adequately protected to
limit erosion and the natural drainage channels do not have signs of high amounts of
erosion or flooding The natural drainage channels are located on a golf course and
..6 . re adequately maintained
Section 7. LID Site Design BMPs
The City of Carlsbad Standard Urban Storm Water Mitigation Plan requires all projects
subject to standard or priority project requirements to implement all applicable site
design BMPs listed below Applicants may employ alternative comparable and
equally effective site design (including requirements applicable to individual priority
project categories) satisfactory to the City. Engineer
Projects are encouraged to address these objectives through the creation of a
hydrologically functional project design that attempts to mimic the natural hydrologic
regime Mimicking a site's natural hydrologic regime maybe pursued by
Reducing imperviousness conserving natural resources and areas maintaining
and using natural drainage courses in the storm water conveyance system and
minimizing clearing 16n6grading that is necessary for the project
Providing runoff storage measures dispersed uniformly throu'gho'ut 'a site's
landscape with the appropriate use of a variety of detention retention and
runoff practices. . ..
Implementing on-lot hydrologically functional landscape design and
management practices
Section 7.01 Maintain Pre-Development rainfal runoff characteristics
:Postdevelopment,péak storm water runoff discharge rates and velocities are controlled
to maintain or reduce pre-development development downstream erosion by applying
the following site design BMPs
701.1 BMP-1 Minimize impervious Areas
The project is designed to minimize the use of impervious areas in the following ways
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Streets areas have been designed to meet the minimum City Standard widths of
:36 feet from curb to curb
Sidewalks have been constructed to minimum width allowed by the city.
:Building footprints have been limited by the use of two storj:buildihgs on all but
H two lots.
I •:••.Driveway widths:have been limited by the use of tandem parking: in the
garages. ..
I . Portions of the driveways will be constructed with unit payers
701 2 BMP-2 Conserve Natural Areas
I The site is an in-fill project surrounded by developed properties and was previously
used for agricultural purposes Therefore there are no natural areas on the site to
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conserve. . . .
.7.01.3 BMP-3 Minimize Directly Connected Impervious Areas
The project is designed to..rninimize directly, connected impervious areas in the
following ways:
:.The downhill end of all the. driveways that drain directly to the streets will be
constructed with unit. payers to disconnect the impervious areas. Drainage from
all bther driveways 'will be directed into' landscaped: *areas' before entOiihg
I drainage systems
RO'otto drain age:'ill.be directed. ihto the landscaéd:yard areas.:
'Walkways and patios will be drained to landscaped areas.
7.01 .4 BMP-4 Maximize Canopy Interception
I CanOpy interception and water conservation will be. maximized consistent with the
...arlsbad .Landscdpe Manual in the following ways
.The project landscape plans call for the planting 'of over 40 trees in the street.
right-of-Way and the slope areas. The original site had only one large eucalyptus
tree 'before grading:.
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Section :702 Protect Slopes and Channels
I Slopes andchannels are. protected on the:site by implementing the following site
I design BMPs. .... : ....:
702 1 BMP-5 Convey Runoff Safely from the Tops of Slopes
I Drainage from all building pads is directed away from the tops of slopes and an earth
.bérm:is instal led.:àtthétops of slopèstó: eliminate. rUnoff:overthe siopes.?Slopes along:.
the tract boundary are protected by concrete brow ditches to convey drainage w. I safely to the bottom of the site
7022 BMP-6 Vegetate Slopes with Native of Drought Tolerant Vegetation
The landscape plans calls for vegetated the slopes with a mix of drought tolerant
ground covers bushes and trees in compliance with the Carlsbad Landscape Manual
7 02 3 BMP-7 Stabilize Permanent Channel Crossings
There are no permanent channel crossings located on the project site
7.02A BMP-8 Energy Dissipators
All lined drainage ditches outlet to parkway culverts to eliminate the potential for
I erosion There are no lined ditches or storm drains that outlet into unlined channels
7 02 5 BMP-9 Minimize disturbances to natural drainages
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There: are no natural drainages oftthe site. The site häs been completely graded in:the
pdst. ..
I . Section 8. . . SoUrce ContrOl BMPs . ... .
Source control BMPs will consist of measures to prevent polluted runoff. The following
I source control BMPs whall be implemented on this site
Section 801 Outdoor Material Storage Areas
I This is .a detached residential pro Oct, and will not inIUde any permanent outdoor .
storage areas. . . . . ......... .
I .... : : .. .. . . . .
H
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. ...... . . .
Storm Water Management Plan (SWMP)
tVJWJ Poinsettia Ridge CT 04-0 1
Engineering . :. ::
Section 8.02 Trash Storage Areas
This is a detached residential project and will not include any central trash storage
areas Individual homeowners will be required to use trash containers with attached
lids that exclude rain
Section 803 Integrated Pest Management Systems
Integrated pest management (IPM) is an ecosystem-based pollution prevention
strategy that fOcuses on lông-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 Pesticides are
used only after monitoring indicates they are needed according to established
guidelines Pest control materials are selected and applied in a manner that minimizes
risks to human health, beneficial and non-target organisms, and the environment.
The following source control BMP's shall be used on this project
:8:03.1 BMP-12 Reduce Pesticide Use
Common maintenance landscape areas will reduce the 'need for pesticide use in the
project design by: . S.
Planting* pest resistant or well-adapted plant varieties: such as native. plants.
Discourage pests by modifying the site and landscaping design
8.03.2 BMP-:13 Educational Material . .
This program will include an educational component directed at each homeowner
The developer shall distribute IPM educational materials to future site residents/tenants
Minimally, educational materials will address the following topics
Keeping pests out of buildings and landscaping using barriers, screens, and
caulking. S
Physical pest elimination techniques, such àslweéding, squashing,. trapping,
washing, or pruning out pests :.:. .
Relying on natural enemies to eat pests. H
Proper use of pesticides as a last line Of defense. .S .
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I
Storm Water Mandgémènt Plan (SWMP)
Poinsettia Ridge CT 04-01
Ehglneering ::
Section 8.04' Efficient Irrigation Systems and Landscape Design
In compliance with the Water Conservation in Landscaping Act the following source
control BMPs to reduce excessive irrigation runoff shall be implemented
8.04.1 BMP-14 Rain Shutoff Devices
Commonly maintained landscaped areas shall employ rain shutoff devices to prevent
irrigation during and after precipitation.
8042 BMP-15 Landscape and Irrigation Design
Commonly maintained landscaped areas shall have irrigation systems designed to
each landscape area's specific water requirements.
8043 BMP16 Flow Reducers or Shutoff Valves
Commonly. maintained landscaped areas shall use flow reducers or shutoff valves
triggered by a pressure drop to control water loss in the event of broken sprinkler
heads or lines. :
Section 8.05 Storm Water Conveyance System Stenciling and Signage
The following source control BMPs to discourage illegal dumping shall be
implemented
8.05.1. BMP-17 Catch Basin Stenciling
The developer will provide concrete stamping, porcelain tile, inset permanent marking
or equivalent as approved by the City of Carlsbad, for the on-site storm drain curb
inlet with prohibitive language (e.g., "No Dumping - I Live Downstream"), satisfactory
to the City-Engineer.
Section 9. BMPs Applicable to Individual Priority
Project Categories ... .
All pribrity projects are required to-incorporate site design BMPs applicable to the
category of the project as identified in Section 5, Table 1.
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I Storm Water Management Plan (SWMP) ME).
Poinsettia Ridge CT 04-01
I Engineering
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Section 9.01 Residential Driveways and Guest Parking
This project is a detached residential development and as such the following site
I design BMPs shall be incorporated into this priority. project
9.011 BMP-20 Driveway Design
I Driveways shall either have a three foot strip of interlocking payers over an approved
sand or gravel base per the Soils Engineer's recommendations at their downhill end or
be designed to drain into adjacent landscaping. I
I 9.01.2, Uncovered Guest Parking
Guest parking spaces bn:priva.te properfy;shall.bedesigne.d to drain into adjacent I landscaping
I Section 10. Treatment Control BMP's
Priority projects are required to implement post constructionl. structural treatment
control BMPs to treat the project runoff for the primary pollutants of concern
I Alternatively, a project proponent may elect to implement a combination of LID BMPs
that either disperse and infiltrate, or direct tO biOretention facilities, the floWs.from all
impervious areas on-site These BMPs are presumed to provide maximum extent
I practicable treatment for all pollutants of concern therefore no further
documentation of the treatment BMP selection: process IS: required.
• For this project all flows from on-site impervious areas are being directed to
landscaped areas that disperse and infiltrate the storm water runoff. s.
I Section 11. Storm Water BMP Maintenance
There are no proposed permanent treatment control BMP's
I Section 12. Summary Conclusions
I This SWMP has been prepared in accordance with the Watershed Protection Storm
water Management, and Discharge Control Ordinance and the Storm water
Standards Manual This SWMP has evaluated and:addressed the potential pollutants
I associated with this project and their effects on water quality. A summary of the facts
and findings associated with this project and the measures addressed by this SWMP is
as follows: • :• •
I •
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I
I t'i1'11 fl) Storm Water Management Plan (SWMP)
IVJL JU, Poinsettia Ridge CT 04-01
I
IEñ9iné4ring
The beneficial uses for the receiving waters have been identified None of these
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beneficial uses will be impaired or diminish due to the construction and operation
of this project. .
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• project will. notsignificantly alter: patterns on the site. The discharge'points will
not be changed ..:
I..................
Open areas and slopes will be landscaped,to reduce or eliminate sediment
:1 dicharge. ....... : . .
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•Interlocking concrete payers will provide a disconnect between impervious
.:surface's and reduce storm waterru.noff from the site.
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. The combination of LID BMPs have the-capacity to disperse and infiltrate: the flows
from all Impervious areas on-site These BMPs are presumed to provide maximum
extent practicable treatment for all pollutants of concern therefore no further
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documentation of the treatment BMP selection process is required
Section 13. Certification
This Storm Water Management Plan has been prepared Under the directionof the
following Registered Civil Engineer. The Registered Civil Engineer attests to the
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information contained herein and the engineering data upon which
recommendations, conclusions, and decisions are based... .
Le
LU
ate Michael, L:*. Benesh, RC 378193
I Exp 3/31/11 CIVIL
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1 6 Infiltration and Runoff
Infiltration of water through soil can reduce the amount of water that reaches stormwater
management systems, filter pollutants and contaminants from the water, and recharge
the watershed The USDA Natural Resources Conservation Service (NRCS formerly
the Soil Conservation Service [SCSI), classifies a soil's infiltration characteristics into
four Hydrologic Soil Groups (HSG)
Group A Low runoff potential Soils having high infiltration rates even when
thoroughly wetted and consisting chiefly of deep, well-drained sands or gravels
Group B Soils having moderate infiltration rates when thoroughly wetted and
consisting Chiëfly:Of moderately deep to deep, moderately well- to well-drained
sandy loam soils; with moderately fine to moderately coarse itextures.
Group ::C: Soils having slow infiltration rates when thoroughly wetted and
consisting chiefly of silty-loam soils with a layer that impedes downward
movement of water, or soils with moderately fine to fine. texture.
Group D High runoff potential. Soils having very slow infiltration rates when
thoroughly wetted and consisting chiefly of clay soils with a high swelling
potential, soils with a permanent high water table, soils with a claypan or clay
layer at or near the surface, and shallow soils over nearly impervious material
Group A and B soils possess the greatest infiltration rates (unless soils are compacted
during construction) and are generally best suited to stormwater infiltration However,
the San Diego Area has .a relatively high concentration of Group C and D soils, which
possess lower infiltration rates that either limit the use of infiltration-based stormwater
management systems or require soil amendments to assist infiltration systems.
For a specific site, the HSG designation can be obtained by :.referring to a local soil
survey, by consulting the complete national listing given in NRCS, or by performing an
on-site investigation Soil Survey maps can be obtained from local NRCS offices or on-
line 4 for use in estimating soil type The NRCS maps are also available at the County of
San Diego, Department of Public Works Consideration should be given to the effects of
Urbanization on the natural hydrologic soil group If heavy equipment can be expected
to compact the soil during construction or if grading will mix the surface and subsurface
soils, appropriate changes should be made in the soil group selected (SD County
Hydrology Manual 20.03):
The table below presents, soil infiltration, rates fOr each soil group determined by
laboratory studies and. measurements. Site designers should compare the design
runoff volume with the available soil storage volume to determine if infiltration is
feasible, and then use the infiltration rates to determine if the design runoff volume can
infiltrate within a reasonable time (generally 24 to 48 hours) For sites with Group C and
http://websoiIsurvey.nrcs.usda.qov/ap/ .
Guidelines for Determining Significance ' 6
Surface Water Quality
I
:
Soil Type
Minimum lnfiltratiofl Rate
. (inches per hour).
A 0.30 to 0.45
0.1:5:to- 0:30
.0 : :.': 0.05 to 0.15
0 :' .0t00.05
I .:.
In general, absorption of surface runoff by clay soils is low and reached quickly,
I whereas in sandy soils a larger portion of the runoff infiltrates the land surface and
recharges the underlying system, resulting in less runoff. groundwater
I I 7 Beneficial Uses of Water
Beneficial uses are defined as, "uses of water necessary for the survival or well being of ' people, plants and wildlife" In San Diego County residents, visitors and nature rely on
the region's water resources to provide beneficial uses such as ensuring a clean and
available drinking water supply, supporting agricultural, commercial industrial,
I
recreational, residential, and military uses, and supporting wildlife and habitat The
State Water Resources Control Board (SWRCB) has adopted a uniform list and
description of beneficial uses to be applied throughout all basins of the State
(Attachment B) These uses of water serve to promote the tangible and intangible
I economic, social and environmental goals identified in the Water Quality Control Plan
for the San Diego Basin (9) prepared by the RWQCB
I
•(www.swrcb.caov/ri6b9/prócirams/basiriølan.html)..
1.8 Stormwater Drainage Systems
I W... ..ithin urban areas stormwater and sewage systems run parallel but are not combined
A vast amount of the unincorporated San Diego County is rural land that does not
support or require stormwater drainage facilities In contrast, most urban areas within
I unincorporated San Diego County have a range of stormwater drainage facilities, all of
Which will continue to be improved as new discretionary projects are constructed
I Collectively, stormwater drainage facilities make up a stormwater conveyance system
m A stormwater conveyance syste as defined by the County of San Diego Watershed
Protection, Stormwater Management and Discharge Control Ordinance "means private
I and public drainage facilities other than sanitary sewers within the unincorporated areas
of San Diego County by which urban run-off may be conveyed to receiving waters, and
includes but is not limited to roads, streets, constructed channels, aqueducts, storm
I drain, pipes, street gutters, inlets to storm drains or pipes, and catch basins"
Guidelines for . Determining Significance 7
Surface Water Quality
I.
1
. . . . cHAPTER 2: CONCEPTS AND CRITERIA
I • Design and construct pervious areas, if any, to effectively receive and infiltrate runoff
from impervious areas, taking into account soil conditions, slope, and other per'tinent
I . .
factors.. . . . . ..
Construct a portion of paved areas with 'ow traffic and appropriate soil conditions
with permeabk surfaces.
I The LID design procedure in Chapter 4 incorporates these requirements into an integrated
design which also meets sizing requirements for stormwater treatment facilities and flow-control
I (T(1r0m0thfitb0n management) requirements
SIZING REQUIREMENTS FOR STORMWATER TREATMENT FACILITIES
The guidance in Chapter 4 was crafted to ensure UD facilities co m'ply with the NPDES permit's I hydraulic sizing requirements for stormwater treatment facilities and flow-control facilities The
technical background follows.
I Most runoff is produced by frequent storms of small or moderate intensity and duration
Treatment facilities are designed to treat smaller storms and the first flush of larger storms—
I
appro"umately 80% of average annual runoff.
The NPDES permit identifies two types of treatment facilities—volume-based and flow -based
Volume-based facuht.es must be designed to infiltrate, filter, or treat the volume of runoff I produced from a 24-hour 1 85th percentile storm event as determined from the County of San
Diego's 85th Percentile Precipitation Isopl uvial Map..As shown on the map, rainfall depths vary
I
........from about 0:55"..to 1.55". ....................:
For flow based facilities, the NPDES permit specifies the rational method be used to determine
flow. The rational method uses the equation
1. GA, .. Q= where, .. . .
..
I ..Q flow . . ...... .
C weighted runoff factor between 0 and I
I i= rain fall intensity
Aarea . . .
I The permit identifies two alternatives for calculating rainfall intensity
I the 85th percentile runfail in times two, or
0.2-inches per hour. . .
I,, H. .... .,.
30 :..
• CoUnt SUSMP-25:Maróh 2010
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- ;.. - .. . . . ..
-
CHAPTER 2 CONCEPTS AND CRITERIA
'S
It is typically found that both methods yield similar results The 02 inches per hour rainfall
intensity should be used fcr sizing flow-based treatment lfacilitlesk within the C6unty's
jurisdiction Tl 02 inches er hour criterion is the basis for a consistent countywide sizing factor for
bioretention facilities when used for stormwater treatment only (i e, not for flow control) The
factor is based on maintaining a minimum percolation rate of 5 inches per, hour through the
engineered soil mu. The sizing factor is the ratio of the design 1n6s1ty of rainfall on tributary
impervious surfaces (0 2 inches/hour) to the design percolation rate in the facility (5
I' inches/hour), or 0 04 (dimensionless)
...,.. .., ....... .. ........ ,.
FLOW CONTROL (HYDROMODIFICATION MANAGEMENT)
-. . ...,
Under current Interim Hydromodification Criteria, the requirement applies to projects I disturbuig 50 acres ormdre, and applicants mayelect among three options 461 comphance
Use a continuous simulation model to compare pre-project and post-project runoff, use LID
facilities with si.img factors and design criteria developed by the Coperni.ittees, or identify a
I specified e 'cemption See Chapter One
The tchmcal background for the Innm Hydromodification Criteria is in the memorandum
I "Development of Interim H)dromodlfielition Criteria" (October 30, 2007) and other technical
documents available on the Project Clean Water website
Hromodification management criteria , I '' •:.'. •• :.:: •'' . ,
, I Post construction peak run off flow rates and velocities from the project site shall be
maintained at levels that will not cause a significant increase in downstream erosion
1 2 Measures to control flow rates and velocities shall not disrupt flows and flow patterns
that are 'necessary to support downstream wetlands or riparian habitats Diveision of
run off to regional facilities shall not heallowé'd to deprive immediate downstream I habitats of the necessary natural low flows levels experienced during the dry we
season or over-bank flow events
1 - 3 Hardening natural downstream areas to preent erosion is prohibited, evcept where
pre-development conditions are shown, to the satisfaction of the County, to be so
erosive that hardening would be required even in the absence of the proposed
deelopment. . -• . • •.•. • ' : :' ....• . . . . ...•
• h 2010 31 :. Cu ontj SUSMP— 25' Maré
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21.
• .....
, .. 0•• .' -'c' . . . . ... .
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- .: .APPENDIX A '
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STORM WATER STANDARDS QUESTIONNAIRE
'INSTRUCTIONS: - .' . .. . .'. , ' .: :': ' •. '. . I
I -
This questionnaire must be completed by the applicant in advance of submitting f0r a development, application
(subdivision and land use planning approvals and construction permits).thei results of the questionnaire determine
M the level of storm' pollution prevention standards applied to a proposed development or redevelopment
project Many aspectsof project site design are dependent upon the storm water:"pollution protection standards
applie1 to a project
I Applicant responses to the questionnaire represent an initial assessment of the proposed project conditions and
impacts City staffs has responsibility for making the final assssment(after submission of the development
application A staff determination that the development application is subject to more stringent storm water
standards than initially assessed by the applicant will result in the return of the development application as 1
incomplete
If applicants are unsure about the meaning of a question or ned help in determining how to respond to one or
I
more of the questions they are advised to seek assistance from Engineering Department Development Services
staff. -
..tC.. ,'. '; . •,
1 *2j.'.a ... . .1-
A separate completed and signed questionnaire must be submitted for eachThew development application
R submission Only one completed and signed questionnaire is required when multiple development applications for
the same project are submitted concurrently. In addition to this questionnaire applicants for construction permits
must also complete sign and submit a Construction Activity Storm Water Standards Questionnaire
— I To address pollutants that may, be generated from new, development the City requires that new, development and
significant redevelopment pnority projects incorporate Permanent Storm Water Best Management Practices
(BMPs) into the project design which1are described in Chapter 2 of the City s Storm Water Standards Manual This
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quetionnaire should be used to categorize new development and significant redevelopment projects as priority or
non-priority to determine what level of storm water standards are required or if the project is exempt
I
l Is your project a significant redevelopment2 .'
-Definition:' -
Significant redevelopment is defined as the creation addition or replacement of at least 5 000 square feet of
impervious surface on an already existing developed site
. -.;
I Significant redevelopment includes but is not limited to the expansion of a building footprint addition to or - replacement of a structure structural development including an increase in gross floor area and/or exterior
construction remodeling replacement of an impervious surface that is not part of a routine maintenance activity
and land disturbing ativities related with structural or •imiervious surfacés:i rra Replacement of impervious suaes
includes any activity that is not part of a routine maintenance activity where impervious matenal(s) are removed
exposing underlying soil during construction
I Note If the Significant Redevelopment results in an increase of less than fifty percent of the impervious surfaces of
a previously existing development and the existing development was not subject to SUSMP requirements the
numeric sizing criteria discussed in Table 3' of 2.3.3.4 applies only to the addition and not to t'he entire
1
. deyeldpmerit;'
1........
2 If your project IS considered significant redevelopment then please skip Section 1 and proceed with Section
2. . • ' ... '• . ' • .. .. ... ' .. ..• ' ' •
3 If your project IS NOT considered significant redevelopment then please poceed to Section 1
Li
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I SECTION 1
NEW DEVELOPMENT
PRIORITY PROJECT TYPE
, Does you, project meet one or more of the following criteria: YES NO
Home subdivision of 100 units or more.
Includes SFD, MFD, Condominium and Apartments
Residential development of 10 units or more.
Includes SFD, MFD, Condominium and Apartments . X
Commercial and industrial development greater than 100,000 square feel including parking areas.
. x Any development on private land that is not for heavy industrial or residential uses. Example: Hospitals,
Hotels, Recreational Facilities, Shopping Malls, etc.
Heavy lndustrial/ Industry greater than I acre (NEED SIC CODES FOR PERMIT BUSINESS TYPES)
SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539
Automotive repair shop.
SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 .
A New Restaurant where the land area of development is 5.000 square feet or more including parking
X areas. .
SIC code 5812
Hillside development
(1) greater than 5,000 square feet of impervious surface area and (2) development will grade on any X
natural slope that is 25% or greater
Environmentally Sensitive Area (ESA).
Impervious surface of 2,500 square feet or more located within, "directly adjacent"2 to (within 200 feet), X
or 'discharging directly to"3 receiving water within the ESA1
Parking lot.
Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban X
runoff
Retail Gasoline Outlets - serving more than 100 vehicles per day x Serving vehicles day than square _more _than _100_ _per _and _greater _5,000_ _feet
Streets, roads, driveways, highways, and freeways.
Project would create a new that is_5,000_ square orgreater. _paved _surface _feet
Coastal Development Zone.
Within 200 feet of the Pacific Ocean and (1) creates more than 2500 square feet of impermeable X
surface or (2) increases impermeable surface on property by more than 10%.
I l Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies;
areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality
Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by
the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments);
I
areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and Count
of San Diego; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees.
2 "Directly adjacent" means situated within 200 feet of the environmentally sensitive area.
I 3 "Discharging directly to" means outflow from a drainage conveyance system that is composed entirely of flows from the
subject development or redevelopment site, and not commingled with flow from adjacent lands.
Section 1 Results:
If you answered YES to ANY of the questions above you have a PRIORITY project and PRIORITY project requirements DO
apply. A Storm Water Management Plan, prepared in accordance with City Storm Water Standards, must be submitted at
time of application. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3.
If you answered NO to ALL of the questions above, then you are a NON!-PRIORITY project and STANDARD requirements
apply. Please check the "DOES NOT MEET PRIORITY Requirements" box in. Section 3.
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Address: : : : . Assessors Parcel Number(s):
SE Cor. of Black Rail & Songbird 215-041-30 thru 45
Applicant Name: Applicant Title: ••
Applicant Signature: Date:
City Concurrence: I YES I NO
By: -.
Date:
Project ID:
SIGNIFICANT REDEVELOPMENT YES NO
1. Is the projectredeveloping an existing priority project type? (Priority projects .
are defined in Section 1)
If you answered YES please proceed to question 2
If you answered NO, then you ARE NOT a significant redevelopment and 'ou ARE NOT subject-to
PRIORITY project requirements only STANDARD requirements Please check the DOES NOT MEET
PRIORITY Requirements" bOx in Section 3 below. :
2 Is the project solely limited to one of the following
Trenching and resurfacing associated with utility work? X
Resurfacing.and reconfiguring existing surface parking Iots? .... X
New sidewalk construction, pedestrian ramps, or bike lane on public ..
. and/or. private existing.roads?
d; Replacement of existing:damaged pavement? :: x
If you answered NO to ALL of the questions then proceed to Question 3
If you answered YES to ONE OR MORE of the questions then you ARE NOT a significant redevelopment
and you ARE NOT subject to PRIORITY project reqUirements, only STANDARD requirements. Please
check . . .
the DOES NOT MEET PRIORITY Requirements box in Section 3 below.
3 Will the development create replace or add at least 5,000 square feet of
impervious surfaces on an existing development or, be located within 200
feet ofthe Pacific -Ocean and (1)create more than 2500 square feet of X
impermeable surface or (2) increases impermeable surface on property by
more than 10%? . .
If you answered YES, you ARE: a significant redevelopment, and you ARE subject to PRIORITY project
requirements. Please check the MEETS PRIORITY REQUIREMENTS" box in Section 3 below.
If you answered .NO you ARE NOT a significant redevelopment, and you ARE NOT subject to
PRIORITY project requirements only STANDARD requirements Please check the DOES NOT MEET
PRIORITY Requirements" box in Section 3 below.
I: SECTION 3 :
I . . Applicant Information and Signature Box . : This Box for City Use Oaly
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ATTACHMENT A - SWMP No. 10-10 BMP SITE PLAN
SWMP NO. /0-10
EXIST. CA TCH B4sI
MAINTENANCE AGREEMENT DOCUMENT: YES No
RECORDA TION No.
PARTY RESPONSIBLE FOR MA IN TENANCE.
BLACK RAIL, LP
GEOFFREY SHERMAN
/7/40 BERNARDO CENTER DRIVE
SAN DIEGO, CA 92/28
(858) 613-1800
PLAN PREPARED BY:
MICHAEL L. BENESH, RCE 37893
NLB ENGINEERING
404 SOUTH LIVE OAK PARK ROAD
FALLBROOK, CA 92078
(760) 731-6603
BlIP NOTES:
THESE BNPs ARE MANDA TORY TO BE INSTALLED PER MANUFACTURER'S RECONMENDA TJONS OR
THESE PLANS.
2. No CHANGES TO THE PROPOSED Bt1Ps ON THIS SHEET WITHOUT PRIOR APPROVAL FROM THE
ENGINEERING DEPARTMENT.
No SUBSTITUTIONS TO THE MA TERIAL OR TYPES OR PLANTING TYPES WITHOUT PRIOR APPROVAL
FROM THE ENGINEERING DEPARTMENT.
4. No OCCUPANCY WILL BE GRANTED UNTIL THE CITY INSPECTION STAFF HAS INSPECTED THIS
PROJECT FOR APPROPRIA TE BNP CONSTRUCTION AND INS TALLA TION.
— —
- DRA INA GE AREA BOUNDA R Y
\ -------
-I—i—i—i—i—I—i—i—i— _—_—_—_—_i_i_i ---------- - - - - SUBDIVISION BOUNDARY
-
- - ----- - - - - - ----------- ______ -
* * * * - - ____________
* * * 'V 'V * * * * .-.---- _______________ ______ - - - - .. --
DRAINAGE AREA I
::>_—'V I5OACRES MDR */J.
PLOT 9 4 4.3 DU/AC SOIL U6
LOT 8 1 GROUP
4 LOT 16
- L62 2 •0 ••••
—i
-
OT 10
43DU/Ac SoIL.
7(I GROUPD
/8TORM DRAIN ='V ----- -,
- - -- 2
------- 2
L 6
T.
LOT 15
r I
. *
—I1iUE
3
AREA
i_
LOT
DRAINAGE AREA4
.•:•:•.••'.:•.... ...t:. ...................................... I LOT/I 0.65AcREsMDR
4.3 DUIAC SOIL
LOT 5 LOT
41
/
L®H
#1 j I LoTi3
J
- UH * . ...................... .
.
/ 4 I L_ _I I I I .7 Ifl I 1 II I IiII _____........._....___ • -._.......!.........__ - %_..__ __- I I J:.:::::I '-.1-I - - . ...1... U::::::.:::.::::::.::::.:I k6,I1 l
LEGEND:
EXISTING IMPERVIOUS AREA:
PROPOSED IMPERVIOUS AREA:
13
DRAINAGE DIRECTION
I
11 7 EX. DRA INA GE DITCH
-EXISTING CURB OUTLET
DRA INA GE AREA 3'
0.3/A CRIES MDR
4.3 DU/AC SOIL
GROUP D
XIS ING DRAINAGE DITCH
__
-
GENERAL NOTES.
I. THE FOLLOWING BNP'S SHALL BE IMPLEMENTED.-
LID SITE DESIGN BNP'S:
PERMEABLE INTERLOCKING PA VERS ARE TO BE USED FOR THE LAST 3 FEET OF ALL
DRIVEWA YS EXCEPT LOT 4. RUNOFF FROM LOT 4 DRI VEWA Y WILL DRAIN TO LANDSCAPING.
ALL ROOFTOP RUNOFF WILL BE DIRECTED INTO LANDSCAPING.
WALKWA YS AND PA TIOS WILL BE CONSTRUCTED OF PERMEABLE PA VING OR DRAIN INTO
LANDSCAPING.
NA TI VE AND DROUGHT TOLERANT VEGETATION WILL BE PLANTED ON SLOPES.
SOURCE CONTROL BlIP's:
EFFICIENT IRRIGA TION SYSTEMS
S TORNWA TER SYSTEMS STENCILING
TREA TMENT BlIP's:
VEGETA TED S WALES
2. THE ANTICIPA TED POLLUTANTS FOR THIS PROJECT ARE:
EI[ II 11I SEDIMENTS
i
NUTRIENTS
TRASH AND DEBRIS
A OXYGEN DEMANDING SUBSTANCES
OIL AND GREASE E n g ineer ing BACTERIA AND VIRUSES
PESTICIDES
Professional Civil Engineers and Land Siwvej'ors
404 South Live Oak Park Road, Fallbiôok, CA 92078
Phone 760 731-6603 FAX 760 897-2165 E-Mail: MBeneshMLBEngineering.com
I BUILDING INSPECTOR I LANDSCAPE INSPECTOR I ENGINEERING INSPECTOR I
SHEET City of Ca ris b a d I
I I ENGINEERING DEPARTMENT SHEETS
SWMP BMP SITE PLAN FOR:
POINSETTIA RIDGE
GRAPHIC SCALE
IPPROVED: GLEN K. PESKI
`EN/ORCIVIL ENGINEER CIVIL PE: 4/204 REG. Exp. 03/31/201!DATE
REVISION DESCRIPTION
DATE I_INITIAL
ENGINEER OF WORK
DRAWN BY: I PROJECT No. DRA WING No. DATE INITIAL DATE INITIAL
I
CHECKED BY:________
OTHER APPROVAL CITY APPROVAL REVIEWED BY: CT 04-0/ - (IN FEET)
I INCH -30 FT.
BMP Table
BMP lD# BMP Type Symbol Std Quantity Drawing No. Sheet No(s) Inspection Maintenance Construction
____________ _____________ _____________ Frequency Frequency Sign Off
Treatment Control
Vegetated CASQATC-30 620 L.F. 1
Swale Mm.
Low Impact Design (L.l.D)
Interlocking City 13MP-1
2 Concrete CASQA SD-20 750 S.F.
Payers
Roof Drains to City BMP-3
3 Landscaping CASQA SD-11 39,000S.F.
Slopes
Planted w/
4 Native or * ' ' City BMP-6 24,875 S.F.
Drought ••'' CASQA SD-10
Tolerant
Vegetation
Walkways
5 and Patios City BMP-3 3500 S.F.
Drain to
Landscaping
Source Controll
Efficient - BMP-14 thru 16
6 Irrigation
* : •: CASQA SD-12 2.9 Acres
Systems
Storm Water City BMP-17
7 System CASQA SD-13 1 Each
Stenciling