HomeMy WebLinkAboutCDP 04-16; La Suvera; Storm Water Management Plan; 2005-05-03HUNSAKER
^ASSOCIATES
SAN
PLANNING
ENGINEERINC
SURVEYING
IRVINE
LOS ANGELES
RIVERSIDE
SAN DIEGO
DIECO, N C.
STORM WATER
MANAGEMENT PLAN
for
REDEEMER BY THE SEA
LUTHERAN CHURCH
(LA SUVERA)
City of Carlsbad, California
Prepared for:
Craftsman Development
1195 Linda Vista Rd,
Suite G
San Marcos, CA 92069
W.O. 2470-2
May 3, 2005
DAVE HAMMAR Eric Mosolgo, R.c!^
LEX WILLIMAN Water Resources Department Manager
ALISA VIALPANDO HunsaKer & Associates San Diego, Inc.
DAN SMITH
RAY MARTIN
10179 Huennekens St.
San Diego, CA 92121
(858) 558-4500 PH
(858)558-1414 FX
www.HunsakerSD.com
lnfo@HunsakerSD.com
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La Suvera
Storm Water Management Plan
TABLE OF CONTENTS
CHAPTER 1 - Executive Summary
1.1 Introduction
1.2 Summary of Pre-Developed Conditions
1.3 Summary of Proposed Development
1.4 Results and Recommendations
1.5 Conclusion
CHAPTER 2 - Storm Water Criteria
2.1 Regional Water Quality Control Board Criteria
2.2 City of Carlsbad SUSMP Criteria
CHAPTER 3 - Identification of Typical Pollutants
3.1 Anticipated Pollutants from Project Site
3.2 Sediment
3.3 Nutrients
3.4 Trash & Debris
3.5 Oxygen-Demanding Substances
3.6 Oil & Grease
3.7 Metals
3.8 Bacteria & Viruses
3.9 Pesticides
CHAPTER 4 - Conditions of Concern
4.1 Receiving Watershed Descriptions
4.2 Pollutants of Concern in Receiving Watersheds
CHAPTER 5 - Flow-Based BMPs
5.1 Design Criteria
5.2 FloGard Curb Inlet Filter Treatment Units
5.3 Pollutant Removal Efficiency Table
5.4 Maintenance Requirements
5.5 Operations and Maintenance Plan
5.6 Schedule of Maintenance Activities
5.7 Annual Operations & Maintenance Costs
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La Suvera
Storm Water Management Plan
CHAPTER 6 - Source Control BMPs
6.1 Landscaping
6.2 Urban Housekeeping
6.3 Automobile Use
6.4 Site Design
6.5 Streetsweeping
CHAPTER 7 - Treatment Control BMP Design (FloGard Units)
7.1 BMP Locations
7.2 Determination of Treatment Flows
CHAPTER 8 - Fiscal Resources
8.1 Fiscal Mechanism Selection
8.2 Agreements (Mechanisms to Assure Maintenance)
CHAPTER 9 - References
List of Tables and Figures
Chapter 1 - Watershed Map
Chapter 1 - BMP Location Map
Chapter 2 - Storm Water Requirements Applicability Checklist
Chapter 3 - Pollutant Category Table
Chapter 4 - Combined 1998 and Draft 2002 Section 303(d) Update
Chapter 4 - Beneficial Uses of Inland Surface Waters
Chapter 4 - Water Quality Objectives
Chapter 5 - Pollutant Removal Efficiency Table (Flow-Based BMPs)
Chapter 6 - Homeowners Information Samples
Chapter 7 - 85"^ Percentile Rainfall Isopluvial Map
Chapter 7 - Design Runoff Determination Spreadsheets
Chapter 7 - FloGard System Data
Chapter 8 - Maintenance Mechanism Selection Table
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La Suvera
Storm Water Management Plan
Chapter 1 - EXECUTIVE SUMMARY
1.1 - Introduction
The La Suvera development consists of a proposed 12 unit residential development,
a single servicing cul de sac and associated sidewalks and open space. The site
area is located at the intersection of Fisherman Road and Poinsettia Lane, east of
Aviara Parkway and south Palomar Airport Road in the City of Carlsbad, California
(see Site Location Map).
Per the City of Carlsbad SUSMP, the La Suvera project is classified as a Priority
Project and subject to the City's Permanent Storm Water BMP Requirements.
This Storm Water Management Plan (SWMP) has been prepared pursuant to
requirements set forth in the City of Carlsbad's "Standard Urban Storm Water
Mitigation Plan (SUSMP)." All calculations are consistent with criteria setforth by
the Regional Water Quality Control Board's Order No. 2001-01, and the City of
Carlsbad SUSMP.
This SWMP recommends the location and sizing of site Best Management Practices
(BMPs) which include three (3) curb inlet filter treatment units (see BMP Location
Map in this chapter).
Furthermore, this report determines anticipated project pollutants, pollutants of
concern in the receiving watershed, puuk fluw iiiillymion,-recommended source
control BMPs, and methodology used forthe design of flow-based BMPs.
CITY OF
SAN MARCOS
CITY OF ENCINITAS
VICINITY MAP
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La Suvera
Storm Water Management Plan
1.2 - Summary of Pre-Developed Conditions
In existing conditions, the site has been graded and prepared for residential
construction. The roads, side walks and storm drains have all been constructed per
"Improvement Plans for Redeemer-By-The-Sea Lutheran Church of Carlsbad" by
Sowards & Brown Engineering, Inc., dated April 14, 2003. Storm water runoff from
the site is conveyed either to the north within the existing 18-inch storm drain in
Fisherman Road, or to the south via an 8-inch storm drain, discharging to a natural
flow path. Ultimately storm water runoff from the existing site discharges to
tributaries ofthe Batiquitos Lagoon.
The Regional Water Quality Control Board has identified the Batiquitos Lagoon as
part ofthe Carlsbad Hydrologic Unit, San Marcos Hydrologic Area, and the
Batiquitos Lagoon Hydrologic Subarea (basin number 904.51).
1.3 - Summary of Proposed Development
Development ofthe site will include the construction of 12 single-family residences.
Runoff from the developed site area will be collected and conveyed either by the
existing 18-inch storm drain system within Fisherman Road, or to the existing 8-inch
storm drain located in the south east ofthe development. The 18-inch storm drain
within Fisherman Road will flow to the north and confluence with an existing 24-inch
system in Poinsettia Lane before discharging into its pre-development natural
watercourse. Runoff to the south will discharge via the existing 8-inch storm drain to
an existing natural flow path.
Three (3) curb inlet filter BMPs will be placed at the three receiving storm drain inlets
within the La Suvera site. 85*^ percentile runoff will be treated in the proposed
FloGard (or an equivalent approved curb inlet filter treatment unit) curb inlet filter
units prior to discharging from the site.
1.4 - Results and Recommendations
Required input to the 85*^ percentile spreadsheet includes drainage area, 85"^
percentile rainfall depth, time of concentration, and percent imperviousness in
contributing watershed. Table 1 summarizes the Rational Method input data.
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La Suvera
Storm Water Management Plan
Table 1 - Rational Method Input Data
Area Drainage Area
(acres)
85"^ Percentile
Rainfall
(inches/hour)
Runoff
Coefficient
85*^ Percentile
Flow (cfs)
North Curb
Inlet 1 1.6 0.2 0.52 0.2
North Curb
Inlet 2 1.4 0.2 0.52 0.2
South Inlet 0.5 0.2 0.52 0.1
Based on County of San Diego criteria a runoff coefficient of 0.52 was assumed for
the proposed single-family residential development.
Calculations show that FloGard curb inlet filter units (or an equivalent approved curb
inlet filter treatment unit) would be required to treat the design 85"^ percentile flow.
Site design and treatment controls such as streetsweeping and home owner
education will be implemented to minimize storm water runoff impact from the La
Suvera residential development.
1.5 - Conclusion
The combination of proposed BMP's will reduce, to the maximum extent practicable,
the expected project pollutants and will not adversely impact the beneficial uses of
the receiving waters.
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L CTTY OF
\l SAN UARCOS
•« Yl;
\ \ \ ]
crTY OF ENONITAS >—^
VICINITY MAP
PROJECT BOUNDARY-
LEGEND
WATERSHED BOUNDARY
WATER TREATMENT UNIT
BMP EXHIBIT MAP FOR
LA SUVERA
CITYOFCARLSBAD, CALIFORNIA
SHEET
1
OF
1 I
R:\000€\achyd\006$H05-LA^SUVERA^MP.dwg[ 2085jApr-2J-2005:12;js
La Suvera
Storm Water Management Plan
Chapter 2 - STORM WATER CRITERIA
2.1 - Regional Water Qualitv Control Board Criteria
All runoff conveyed in the proposed storm drain systems will be treated in
compliance with Regional Water Quality Control Board regulations and NPDES
criteria prior to discharging to natural watercourses. California Regional Water
Quality Control Board Order No. 2001-01, dated February 21, 2001, sets waste
discharge requirements for discharges of urban runoff from municipal storm
separate drainage systems draining the watersheds of San Diego County.
Per the RWQCB Order, post-development runoff from a site shall not contain
pollutant loads which cause or contribute to an exceedance of receiving water
quality objectives or which have not been reduced to the maximum extent
practicable. Post-construction Best Management Practices (BMPs), which refer to
specific storm water management techniques that are applied to manage
construction and post-construction site runoff and minimize erosion, include source
control - aimed at reducing the amount of sediment and other pollutants - and
treatment controls that keep soil and other pollutants onsite once they have been
loosened by storm water erosion.
Post construction pollutants are a result ofthe urban development ofthe property
and the effects of automobile use. Runoff from paved surfaces can contain both
sediment (in the form of silt and sand) as well as a variety of pollutants transported
by the sediment. Landscape activities by homeowners are an additional source of
sediment.
All structural BMPs shall be located to infiltrate, filter, or treat the required runoff
volume or flow (based on the 85* percentile rainfall) prior to its discharge to any
receiving watercourse supporting beneficial uses.
2.2 - Citv of Carlsbad SUSMP Criteria
Per the City of Carlsbad SUSMP, the La Suvera project is classified as a Priority
Project and subject to the City's Permanent Storm Water BMP Requirements.
These requirements required the preparation ofthis Storm Water Management Plan.
The Storm Water Applicability Checklist, which must be included along with Grading
Plan applications, is included on the following page.
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Storm Water Standards
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VI. RES0URCES..&. REFERENCES-,
APPENDIX A
STORM WATER REQUIREMENTS APPUCABILITY CHECKLIST
Complete Sections 1 and 2 of the foliowing checklist to determine your projecfs
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 Storni Water BMP Selection
Procedure" in the Storm Water Standards manual.
If all answers to Part A are "Mo," 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
stonn water requirements.
Does the project meet the definition of one or more of the priority project
categories?* Yes No
1. Detached residential development of 10 or more units
2. Attached residential development of 10 or more units
3. Commerdal development qreater than 100,000 square feet • 4. Automotive repair shop • 5. Restaurant /
6. Steep hillside development qreater than 5,000 square feet
7. Project discharqinq to receivinq waters within Environmentally Sensitive Areas
8. Parking lots greater than or equal to 5,000 ft^ or with at least 15 parking spaces, and
potentiallv exposed to urban runoff y
9. Streets, roads, highways, and freeways which wouid create a new paved surface that is
5,000 square feet or qreater
• Refer to the definitions section in the Storm Water Standards for expanded definitions of the priority
project cateqories.
Lirnrted Exdusion: Trenching and resurfadng wori< associated with utility projects are not considered
priority projects. Paridng 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.
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Stonn Water Standards
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Part D: Determine Construction Site Priority
In accordance wth the Municipal Pennit, 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 ofthe check boxes using the
criteria below, and existing and sumounding 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 constmction 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.]
A) High Prionty
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 directiy
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
Q 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) Pennit 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 properiy where grading pennits 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) Pennit projects in the public right-of-way where minimal to no grading occurs,
such as pedestrian ramps, driveway additions, small retaining walls, etc.
3) Pennit projects on private property where grading permits are not required,
such as small retaining walls, single-family homes, small tenant
improvements, etc.
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Storm Water Standards
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i
i
I
I
I
household wasTe?" '"""^^ ^""^""^ "'•^^rage, exduding typiail^ffi^
9. Any grading or ground disturiaance during constnjction?
IP. Any new storm drains, or alteration to existing stonn draini?"
To find out If your project is required to obtain an i^ndividual General NPDES Permit for stnJ\M.J "
Discharges Associated wfth Industrial Activities, visit the State wSerRSourcesC^^^^ >
lat, www.swrcfa.ea.gov/stormwtr/industrial html Kesources Control Board web site
Section 2. Construction Storm Water BMP Requirements-
f wT ' stonn Water BMP Perfomiance S andards " Sr^ust preoa e
vo^rlmiec i'Jp" """T ' ^^^^ P-rt ^ is answe ed -^^^^^ your project is exempt from any construction stomi water BMP requirements If anv of
--• . WI.W.IIII w»ciier requirements.
Would the project meet any of these criteria during construction? YPS No
1. Is the praject subject to Califomia's statewide General NPDES Permit for Storm Water
Discharges Assodated With Construction Activities?
2, Does the proiect nrnno-se nradinn nr qnil r^i'-ttirK-ir-i.-r^o ~~ •
/
^' ^'°^nn^3''^'^' °' "^f have the potential to contact any portion of the
constnjction area, including washina and staging area.!?
^. vvouiq the project use any constmction materials that could negatively affect water
qual^ If discharged from the site (such as, paints, solvents^, concrete!and >/
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La Suvera
Storm Water Management Plan
Chapter 3 - IDENTIFICATION OF TYPICAL POLLUTANTS
3.1 - Anticipated Pollutants from Proiect Site
The following table details typical anticipated and potential pollutants generated by
various land use types. The La Suvera development will consist of detached single-
family residences. Thus, the Detached Residential Development category has been
highlighted to cleariy illustrate which general pollutant categories are anticipated
from the project area.
General Pollutant Categories
Priority
Project
Categories Sediments Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides Attached
Residential
Development
X X x pd) p(2) p X
Commercial
Development
>100,000 ft^
p(i) p(1) p(2) X p(5) X p(3) p(5)
Automotive
Repair
Shops
X X('»)(5) X X
Restaurants x X X X
Hillside
Development
>5,000 ft^
X X X X X X
Parking Lots p(1) p(1) x X p(1) X p(1)
Streets,
Highways &
Freeways
X p(1) x X(4) x p(5) X
Retail Gas
Outiets x X(4) X 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) A potential pollutant if land use involves food or animal waste products.
(4) Including petroleum hydrocarbons.
(5) Including solvents.
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Storm Water Management Plan
3.2 - Sediment
Soils or other surface 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, smother bottom dwelling organisms, and suppress aquatic
vegetative growth.
3.3 - Nutrients
Inorganic substances, such as nitrogen and phosphorous, that 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.
3.4 - Trash & Debris
Examples include paper, plastic, leaves, grass cuttings, and food waste, which 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 areas where stagnant water is
present, 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.
3.5 - Oxygen-Demanding Substances
Biodegradable organic material as well as chemicals that react with dissolved
oxygen in water to fomn other 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.
3.6 - Oil & Grease
Characterized as high high-molecular weight organic compounds. Primary sources
of oil and grease are petroleum hydrocarbon products, motor products from leaking
vehicles, oils, waxes, and high-molecular weight fatty acids. Elevated oil and grease
content can decrease the aesthetic value ofthe water body, as well as the water
quality.
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La Suvera
Storm Water Management Plan
3.7 - Metals
Metals are raw material components in non-metal products such as fuels, adhesives,
paints and other coatings. Primary sources of metal pollution in storm water are
typically commercially available metals and other products. Metals of concern
include cadmium, chromium, copper, lead, mercury and zinc. Lead and chromium
have been used as corrosive 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 in the environment, have already led to restricted
metal usage in certain applications.
3.8 - Bacteria and Viruses
Bacteria and viruses are ubiquitous micro-organisms that thrive under certain
environmental conditions. Their proliferation is typically caused by the transport of
human fecal wastes from the watershed. Water, containing excessive bacteria and
viruses can alter the aquatic habitat and create a harmful environment for humans
and aquatic life. Also, the decomposition of excess organic waste causes increased
growth of undesirable organisms in the water.
3.9 - 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.
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La Suvera
Storm Water Management Plan
Chapter 4 - CONDITIONS OF CONCERN
4.1 - Receiving Watershed Descriptions
As shown in the watershed map on the following page, the pre-developed and post-
developed La Suvera site drains to the San Marcos Creek watershed.
The Regional Water Quality Control Board has identified Batiquitos Lagoon as part
of the Carisbad Hydrologic Unit, San Marcos Hydrologic Area, and the Batiquitos
Lagoon Hydrologic Subarea (basin number 904.51).
4.2 - Pollutants of Concern in Receiving Watersheds
The Batiquitos Lagoon is not listed on the EPA's 303(d) List of endangered
waterways (included in this Chapter). The nearest impaired water body is the Pacific
Ocean Shoreline located at Moonlight State Beach, impaired by bacteria. The
Moonlight State Beach is roughly three (3) miles from the project site.
Per the "Water Quality Plan for the San Diego Basin", the beneficial uses for the
Batiquitos Lagoon include, contact water recreation, non-contact recreation,
preservation of biological habitats of special significance, estuarine habitat, wild life
habitat, rare, threatened or endangered species, marine habitat, migration of aquatic
organisms and spawning, reproduction and/or eariy.
Table 3-2 from the "Water Quality Plan for the San Diego Basin" (included at the end
of this Chapter) lists water quality objectives for a variety of potential pollutants
required to sustain the beneficial uses of the San Marcos hydrologic area.
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LA SUVERA
crrr OF CARLSBAD, CALIFORNIA
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT Approved by SWRCIS:
February 4, 2003
San Luis Rey River
9 R
9 E
9 R
9 R
Sandia Creek
Santa Margarita Lagoon
Santa IVlargarlta River (Upper)
Segunda Deshecha Creek
90311000
90222000
90211000
90222000
90130000
Chloride
ImpairmenI locaied at lower 13 miles.
Urban Runofl/Storm Scnrers
Unknown Nonpoint Source '
Unknown point source
Total Dissolved Solids
Total Dissolved Solids
Eutrophic
Phosphorus
Phosphorus
Industrial Point Sources
Agriculture-storm rnnolT
Urban Runoff/Storm Sewers
Surface Mining
Flow Regulation/Modliication
Natural Sources
Golf course activities
Unknown Nonpoint Source
Unknown point source
Urban Runoff/Storm Sewers
Flow Regulation/Modincatlon
Natural Sources
Unknown Nonpoint Source
Unknown point source
Nonpoint/Point Source
Urban Runofl/Storm Sewers
Unknown Nonpoint Source
Unknown point source
joaaamrnxmasataiSi
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low
Low
Low
Low
Low
Low
19 MUes
19 MUes
1.5 Miles
28 Acres
18 MUes
0.92 Miles
195
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT Approved by smci^-.
^ ^ February 4,2003
E Aliso Creek (mouth)
E Buena Vista Lagoon
R Chollas Creek
90113000
90421000
BoaiB
90822000
Phosphorus
Impairment located at lower 4 miles.
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low
Toxicity Low
mmmBsssaaBmiM
Bacteria Indicators
Bacteria Indicators
Nutrients
Urban Runofl/Storm Sewers
Unknown Nonpoint Source
Unlcnown point source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
Low
Low
Estimated size of impairment Is 150 acres located in upper portion of lagoon.
Nonpoint/Point Source
Sedimentation/Siltation Medium
Nonpoint/Point Source
19 MUes
19 MUes
0.29 Acres
202 Acres
202 Acres
202 Acres
Bacteria Indicators Medium 1.2 Miles
Cadmium
Nonpoint/Point Source
High 1.2 MUes 2004
Copper
Nonpoint/Point Source
High 1.2 MUes 2004
Diarinon
Nonpoint/Point Source
High 1.2 MUes 2002
Lead
Nonpoint/Point Source
High 1.2 MUes 2004
Zinc
Nonpoint/Point Source
Nonpoint/Point Source
High 1.2
iBffiniinaimn»
MUes 2004
184
Table 2-2. BENEFICIAL USES OF INLAND SURFACE WATERS
BENEFICIAL USE
1.2
Inland Surface Waters Hydrologic Unit
Basin Number
M
U
N
A
G
R
1
N
D
P
R
0
C
G
W
R
F
R
S
H
P
0
W
R
E
C
1
R
E
C
2
B
1
0
L
W
A
R
M
C
0
L
D
W
1
L
D
R
A
R
E
S
P
W
N
San Diego County Coastal StreamiS - continued •
Buena Wsfa Lagoon 4.21 See Coastai Waters-Table 2-3
Buena Vista Creek 4.22 + • • • • • •
Buena Vista Creek 4.21 + • • • • • • •
Agua Hedionda 4.31 See Coastal Waters- Table 2-3
Agua Hedionda Creek 4.32 • • • • • • •
Buena Creek 4.32 • • • • • • •
Agua Hedionda Creek 4.31 • • • • • • •
Letterbox canyon 4.31 • • • • • • •
Canyon de las Encinas 4.40 + 0 • • •
San Marcos Creek Watershed
Batiquitos Lagoon 4.51 See Coastal Waters- Table 2-3
San Marcos Creek 4.52 + • • • • •
unnamed Intemiittent streams 4.53 + • • • • •
San Marcos Creek Watershed
San Marcos Creek 4.51 + • • • • •
Encinitas Creek 4.51 + • • • • •
• Existing Beneficial Use
0 Potential Benefidal Use
+ Excepted From MUN (See Text)
Waterbodies are listed multiple times if they aoss hydrologic area or sub area boundaries.
Benefic^lal use designations apply to all tributaries to the indicated waterbody, if not listed separately.
Table 2-2
BENEFICIAL USES 2-27
March 12, 1997
Table 3-2. WATER QUALITY OBJECTIVES
Concentrations not to be exceeded more than 10% of the time during any one one year period.
Const tiuent (mg/L or as noted)
Inland Surface Waters Hydrologic
Unit Basin
Number
TDS Cl SO 4 %Na N&P Fa Mn MBAS B ODOR Turb
NTU
Color
Units F
SAN LUIS REY HYDROLOGIC UNIT 903.00
Lower San Luis HA 3.10 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20
Monserat HA 3.20 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Warner Valley HA 3.30 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
CARLSBAD HYDROLOGIC UNIT 904.00
Loma Alta HA 4.10 ---------none 20 20 1.0
Buena Vista Creek HA 4.20 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Agua Hedionda HA 4.30 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Encinas HA 4.40 ---------none 20 20 1.0
San Marcos HA 4.50 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Escondido Creek HA 4.60 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
SAN DIEGUITO HYDROLOGIC UNIT 905.00
1
Solana Beach HA 5.10 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0 1
Hodges HA 5.20 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
San Pasqual HA 5.30 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Santa Maria Valley HA 5.40 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Santa Ysabel HA 5.50 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0 1
PENASQUITOS HYDROLOGIC UNIT 906.00
Miramar Reservoir HA 6.10 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
Poway HA 6.20 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0 1
HA - Hydrologic Area
HSA - Hydrologic Sub Area {Lowet case letters indicate endnotes following the table.)
Table 3-2
WATER QUALITY OBJECTIVES Page 3-23 September 8, 1994
La Suvera
Storm Water Management Plan
CHAPTER 5 - FLOW-BASED BMPS
5.1 - Design Criteria
Flow-based BMPs shall be designed to mitigate the maximum flowrate of runoff
produced from a rainfall intensity of 0.2 inch per hour. Such BMPs utilize either
mechanical devices (such as vaults that produce vortex effects) or non-mechanical
devices (based on weir hydraulics and specially designed filters) to promote settling
and removal of pollutants from the runoff.
Per the request of the City of Carisbad, 85'^ percentile flow calculations were
performed using the Rational Method. The basic Rational Method runoff procedure
is as follows:
Design flow (Q) = C * I * A
Runoff Coefficient (C) - In accordance with the County of San Diego standards, the
weighted runoff coefficient for all the areas draining to the treatment unit was
determined using the areas analyzed in the final engineering hydrology report. The
runoff coefficient is based on the following characteristics ofthe watershed:
Land Use - Single-Family Residential in Developed Areas
Soil Type - Hydrologic soil group D was assumed for all areas. Group
D soils have very slow infiltration rates when thoroughly wetted.
Consisting chiefly of clay soils with a high swelling potential, soils with a
high permanent water table, soils with clay pan or clay layer at or near
the surface, and shallow soils over neariy impervious materials. Group
D soils have a very slow rate of water transmission.
Rainfall Intensity (I) - Regional Water Quality Control Board regulations and NPDES
criteria have established that flow-based BMPs shall be designed to mitigate a
rainfall intensity of 0.2 inch per hour.
Watershed Area (A) - Corresponds to total area draining to treatment unit.
5.2 - FloGard Curb Inlet Filter Units
Curb inlet filter unit inserts are a flexible storm drain catchment and filtration liner
designed to collect contaminants and debris prior to discharge into storm drain
systems. As per the attached FloGard documents, curb inlet filter units are suitable
for all pollutants typically found on land developments, including heavy metals and
hydrocarbons.
The units are installed within the storm drain inlet, the pollutants being absorbed
within the curb inlet filter unit until it is replaced by a new filtration liner.
DE:de H:\REPOKTSa470i02\SWMP03.doc
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La Suvera
Storm Water Management Plan
All 85*^ percentile runoff from the La Suvera development will be treated via three (3)
FloGard curb inlet filter units.
5.3 - Pollutant Removal Efficiency Table
The table on the following page shows the generalized pollutant removal efficiencies
for drainage inserts.
5.4 - Maintenance Reguirements
Maintenance ofthe curb inlet filter units requires quarterly annual inspections during
the dry season (June through September) and monthly during the wet season
(October through May). The units need to be cleaned out quarteriy to remove trash,
debris and excess sediment. The curb inlet filter units require replacing annually at
which time the filter shall be disposed of in accordance with state and federal
environmental protection requirements. The replacement filter is then placed into
the existing bracket below the storm drain entrance.
Maintenance ofthe site BMPs will be the responsibility ofthe Homeowners
Association. A maintenance plan will be developed and will include the following
information:
Specification of routine and non-routine maintenance activities to be performed
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Chapter 4: Guidance for Selection of Permanent BMPs
I
I
I
I
I
I
I
1
Table 4.3 Treatment Control BMP Selection Matrix'^'.
Pollutant of
Concem Treatment Control BMP Categories
L: Low removal efficiency):
M: Medium removal efficiency):
H: High removal efficiency):
U: Unknown removal efficiency
/^QQ^r;/2"'''^f ^P^"'y'''9 Management Measures for Sources of Nonpoint Pollution in Coastal Waters
La Suvera
Storm Water Management Plan
5.5 - Schedule of Maintenance Activities
Target Maintenance Dates - June 15*^, September 15*^ (Dry Season Inspections)
Maintenance Activity - Regular inspection to ensure that filter unit is functioning
properiy, has not become clogged, and does not need to
be replaced;
Target Maintenance Dates - 15*^^ of each month; October through April (Rainy
Season Inspections)
Maintenance Activity - Regular inspection to ensure that filter unit is functioning
properiy, has not become clogged, and does not need to be
replaced;
Target Maintenance Date - March 15'^ June 15^, September 15^, December 15'
Maintenance Activity - Quarteriy cleanouts; Cleanout filter, remove trash, debris
and excess sediment.
th
th Target Maintenance Dates - March 15
Maintenance Activity - Annual filter replacement; Remove and replace filter.
Dispose of used filter according to state and federal
environmental protection guidelines. Place new filter in
existing bracket below the storm drain entrance.
For proper maintenance to be performed, the storm water treatment facility must be
accessible to both maintenance personnel and their equipment and materials.
5.6 - Annual Operations and Maintenance Costs
The following example outiines approximate Annual Maintenance costs for proposed
FloGard units. Costs assume a 3 man crew:
Periodic Inspection and Cleanout ($100 per inlet x 4 times annually = 12
inspections) = $1,200
Annual Filter Replacement = $200/unit x 3 inlets = $600
Subtotal = $1,800
10% Contingency = $180
Approximate Total Annual Maintenance Costs of FloGard Units = $1,980
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KRISTAPJ
GENERAL SPECIFICATIONS FOR MAINTENANCE OF
FLO-GARD™+PL US CA TCH BASIN INSERT FIL TERS
SCOPE:
Federal, State and Local Clean Water Act regulations and tiiose of insurance carriers require that
stomiwater filtration systems be maintained and serviced on a recurring basis. The intent ofthe regulations
is to ensure tliat tlie systems, on a continuing basis, efficiently remove pollutants fi-om stormwater runoff
thereby preventing pollution of tiie nation's water resources. These Specifications apply to the Flo-Gard™
-l-Plus Catch Basin Insert Filter.
RECOMMENDED FREQUENCY OF SERVICE:
Drainage Protection Systems (DPS) recommends that installed Flo-Gard™ -l-Plus Catch Basin Insert Filters
be serviced on a recurring ijasis. Ultimately, tlie fi'equency depends on the amount of runoff, pollutant
loading and interference from debris (leaves, vegetation, cans, paper, etc.); iiowever, it is recommended
that eacli installation be serviced a minimum of tiiree times per year, witii a cliange of filter medium once
per year. DPS teclinicians are available to do an on-site evaluation, upcm request.
RECOMMENDED TIMING OF SERVICE:
DPS guidelines for the timing of service are as follows:
1. For areas witii a definite rainy season: Prior to, during and following the rainy season.
2. For areas subject to year-round rainfell: On a recurring basis (at least three times per year).
3. For areas with winter snow and summer rain: Prior to and just after tiie snow season and during
the summer rain season.
4. For installed devices not subject to the elements (washracks, parking garages, etc.): On a recurring
basis (no less than three times per year).
SERVICE PROCEDURES:
1. The service shall commence with collection and removal of sediment and debris (litter, leaves,
papers, cans, etc.) and broom sweeping around the drainage inlet. Accumulated materials shall be
placed in a DOT approved container for later disposal.
2. The catch basin shall be visually inspected for defects and possible illegal dumping. If illegal
dumping has occurred, the proper authorities and property owner representative shall be notified
as soon as practic:able.
3. The catch basin grate shall be removed and set to one side. Using an industrial vacuum, the
collected materials shall he removed from the liner. (Note: DPS uses a truck-mounted vacuum for
servicing Flo-Gard ™-i-Plus catch basin inserts.)
4. When all of the collected materials have been removed, the filter medium pouches shall be
removed by unsnapping the tether from the D-ring and set to one side. The filter liner, gaskets,
stainless steel frame and mounting brackets, etc. shall he inspected for continued serviceability.
Minor damage or defects found shall be corrected on-the-spot and a notation made on the
Maintenance Record. More extensive deficiencies that affect the efficiency of the filter (tom liner,
etc.), if approved by the customer representative, will be corrected and an invoice submitted to the
representative along with the Maintenance Record.
5. The filter medium pouches shall be inspected for defects and continued serviceability and replaced
as necessary and the pouch tethers re-attached to the liner's D-ring. See below.
6. The grate shall be replaced.
EXCHANGE AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS
The frequency of filter medium pouch exchange vrill he in accordance with the existing DPS-Customer
Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the
appropriate service, or if so detennined by the service tecimician during a non-scheduled service, the filter
medium pouches vrill b>e replaced with new pouches and the exposed pouches placed in the DOT approved
container, along with the exposed debris. Once the exposed pouches and debris have been placed in the
container, DPS has possession and must dispose of it in accordance with local, state and federal agency
requirements.
Note: As the generator, tke landowner is ultimately responsible for the proper disposal of the exposed
filter medium and debris. Because the materials Ukely contain petroleum hydrocarbons, heavy metals
and other hamtful pollutants, the materials must be treated as an EPA Class 2 Hazardous Waste and
properly disposed of. DPS relieves the landowner of the actual disposal task, and provides certification
of its conviction in accordance with appropriate regulations.
DPS also has the capability of servicing all manner of catch basin inserts and catch basins without
inserts, underground oil/water separators, stormwater interceptors and other such devices. All DPS
personnel are highly qualifled technicians and are confined space trained and certifled. Call us at
(888) 950-8826 for further information and assistance.
05/04/04
La Suvera
Storm Water Management Plan
Chapter 6 - SOURCE CONTROL BMPs
6.1 - Landscaping
Manufactured slopes shall be landscaped with suitable ground cover or installed with
an erosion control system. Homeowners will be educated as to the proper routine
maintenance to landscaped areas including trimming, pruning, weeding, mowing,
replacement or substitution of vegetation in ornamental and required landscapes.
Per the RWQCB Order, the following landscaping activities are deemed unlawful
and are thus prohibited:
Discharges of sediment
Discharges of pet waste
Discharges of vegetative clippings
Discharges of other landscaping or construction-related wastes.
6.2 - Urban Housekeeping
Fertilizer applied by homeowners, in addition to organic matter such as leaves and
lawn clippings, all result in nutrients in storm water runoff. Consumer use of
excessive herbicide or pesticide contributes toxic chemicals to runoff. Homeowners
will be educated as to the proper application of fertilizers and herbicides to lawns
and gardens.
The average household contains a wide variety of toxins such as oil/grease,
antifreeze, paint, household cleaners and solvents. Homeowners will be educated
as to the proper use, storage, and disposal of these potential storm water runoff
contaminants.
Per the RWQCB Order, the following housekeeping activities are deemed unlawful
and are thus prohibited:
Discharges of wash water from the cleaning or hosing of impervious surfaces
including parking lots, streets, sidewalks, driveways, patios, plazas, and
outdoor eating and drinking areas (landscape irrigation and lawn watering, as
well as non-commercial washing of vehicles in residential zones, is exempt
from this restriction)
Discharges of pool or fountain water containing chloride, biocides, or other
chemicals
Discharges or runoff from material storage areas containing chemicals, fuels,
grease, oil, or other hazardous materials
Discharges of food-related wastes (grease, food processing, trash bin wash
water, etc.).
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La Suvera
Storm Water Management Plan
6.3 - Automobile Use
Urban pollutants resulting from automobile use include oil, grease, antifreeze,
hydraulic fluids, copper from brakes, and various fuels. Homeowners will be
educated as to the proper use, storage, and disposal of these potential storm water
contaminants.
Per the RWQCB Order, the following automobile use activities are deemed unlawful
and are thus prohibited:
Discharges of wash water from the hosing or cleaning of gas stations, auto
repair garages, or other types of automotive service facilities.
Discharges resulting from the cleaning, repair, or maintenance of any type of
equipment, machinery, or facility including motor vehicles, cement-related
equipment, port-a-potty servicing, etc.
Discharges of wash water from mobile operations such as mobile automobile
washing, steam cleaning, power washing, and carpet cleaning.
The Developer will make all homeowners aware ofthe aforementioned RWQCB
regulations through a homeowners' education program (samples of which have been
attached at the end ofthis chapter).
6.4 - Site Design BMPs
Priority projects, such as the La Suvera project, shall be designed to minimize, to the
maximum extent practicable the introduction of pollutants and conditions of concern
that may result in significant impact, generated from site runoff to the storm water
conveyance system. Site design components can significantly reduce the impact of
a project on the environment. The following design techniques have been proposed
to accomplish this goal.
- Implementing on-lot hydrologically functional landscape design and
management practices; Additional detail regarding landscaping design is
discussed in section 5.1
- Minimizing project's impervious footprint. Methods of accomplishing this goal
include constructing streets, sidewalks, and parking lots to the minimum
widths necessary without compromising public safety.
DE:()e H:\REPORTS\2470\02awMP03.doc
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La Suvera
Storm Water Management Plan
6.5 - Streetsweeping
Streetsweeping entails regular street cleaning using mechanical vehicles to reduce
pollutants in stormwater runoff from street surfaces. Streetsweeping vehicles
physically remove solids from impervious surfaces, by mechanical means (which
can be vacuum-assisted), thus reducing the availability of solids and associated
pollutants for pickup by subsequent runoff-generating rainfall.
While eariier results ofthe Nationwide Urban Runoff Program (USEPA, 1983)
suggested that conventional streetsweeping had a relatively low impact on the
improvement of water quality in the Midwest and eastern United States, more recent
studies have found vacuum-assisted streetsweeping to be more effective.
Streetsweeping using equipment based on new vacuum-assisted technologies can
significantiy reduce pollutant washoff from urban streets. Weekly to bimonthly
sweeping programs can achieve reductions of up to 80 percent in annual total
suspended solids and associated pollutants (Sutheriand and Jelen, 1996).
DE:de H:\REPORTS\247(R02\SWMP03.doc
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A clean environment is
important to all of us!
Did you know that storm drains are
NOT connected to sanitary sewer
systems and treatment plants? The
primary purpose of storm drains is to
carry rainwater away from developed
areas to prevent flooding. Untreated
storm water and the pollutants it
carries, flow directly into creeks,
lagoons and the ocean.
In recent years, sources of water
pollution like industrial waters from
factories have been greatly reduced.
However now, the majority of water
pollution occurs from things like cars
leaking oil, fertilizers from farms, lawns
and gardens, failing septic tanks, pet
waste and residential car washing into
the storm drains and into the ocean
and watenways.
All these sources add up to a pollution
problem! But each of us can do small
things to help clean up our water and
that adds up to a pollution solution!
Motor oil photo is used
courtesy of the Water
Quality Consortium, a
cooperative venture
between the Washington
State Department of
Ecology, King County and
the cities of Bellevue,
Seattle and Tacoma.
Only Rain in the Storm Drain!
City of Carlsbad
Storm Water Protection
Program
CityofCarlsbad
1635 Faraday Avenue
Carlsbad CA 92008
Storm Water HOTIine:
760-602-2799
Wg^^ Funded by a grant
from the California
I^HH Integrated Waste
j^^* Management Board
U,SED OU.
Motor Oil
•'ipnjy Rain In the Storm Drain!
City of Carlsbad
Storm Water Protection
Program
Storm Water HOTIine:
760-602-2799
/f ^Printed on recycled paper
What's the problem with
motor oil? How can YOU help keep our environment clean?
Oil does not dissolve in water. It
lasts a long time and sticks to
everything from beach sand to bird
feathers. Oil and other petroleum
products are toxic to people, wildlife
and plants.
One pint of oil can make a slick
larger than a football field. Oil that
leaks from our cars onto roads and
driveways is washed into storm
drains, and then usually flows
directly to a creek or lagoon and
finally to the ocean.
Used motor oil is the largest single
source of oil pollution in our ocean,
creeks and lagoons. Americans spill
180 million gallons of used oil each
year into our waters.
This is 16 times the
amount spilled by the
Exxon Valdez in
Alaska.
Having a clean environment
is of primary importance for
our health and economy.
Clean watenvays provide
commercial opportunities,
recreation, fish habitat and
add beauty to our
landscape. YOU can help
keep our ocean, creeks and
lagoons clean by applying
the following tips:
• Stop drips. Check for oil
leaks regularly and fix them
promptly. Keep your car tuned to
reduce oil use.
• Use ground cloths or drip pans
beneath your vehicle if you have leaks
or are doing engine work.
• Clean up spills immediately.
Collect all used oil in containers with
tight fitting lids. Do not mix different
engine fluids.
- When you change your oil,
dispose of it properiy. Never dispose
of oil or other engine fluids down the
storm drain, on the ground or into a
ditch.
• Recycle used motor oil. There
are several locations in Carlsbad that
accept used motor oil. For hours and
locations, call 760-434-2980.
• Buy recycled ("refined") motor oil
to use in your car.
A clean environment is
important to all of us!
Ji|!"ydu know that storm drains are
t!£%»iradlJbli)T' connected to sanitary sewer
^l^^i^ystems and treatment plants? The
^^I'^^'primary purpose of storm drains is to
^^^|6arry rainwater away from developed
iM^*?«^&reas to prevent flooding. Untreated
! =- , storm water and the pollutants it
; .' carries, flow directly into creeks,
lagoons and the ocean.
In recent years, sources of water
pollution like industrial waters from
factories have been greatly reduced.
However now, the majority of water
pollution occurs from things like cars
psS^Vr leaking oilj fertilizers from farms and
gardens, failing septic tanks, pet waste
and residential car washing into the
storm drains and into the ocean and
; waten/'/ays.
^11 these sources add up to a pollution
Jrabjlm! But each of us can do small
iiiirigs to help clean up our water and
that adds up to a pollution solution!
K'IWHHH
Pet waste photo is used courtesy
of the Water Quality Consortium,
a cooperative venture between
the Washington State Department
of Ecology, King County and the
cities of Bellevue, Seattle and
Tacoma.
A<\theg.
Storm Water HOTIine: 760-602-2799
stormwater@ci.carlsbad.ca.us
City of Carlsbad
1635 Faraday Avenue
Carlsbad CA 92008
www.ci.cadsbad.ca.us
•i'-l -1
•I
^ ^Printed on recycled paper
Pet waste is a health risk to pets and
people, especially children. It's a
nuisance in oLir neighborhoods. Pet
waste IS full of bacteria that can make
'people sicki This bacteria gets
washed into the storm drain and ends
up in ourcreeks, lagoons and ocean.
The bacteria ends up in shellfish living
in these water bodies. People who
eat those shellfish may get very sick.
l^'^.Preliminary studies show that dog and
feiiJ-Vs^cat waste can contribute up to 25% of
Si!'-the harmful bacteria found in our local
agoons.
Be responsible and clean up after
'&,'iiniir note lt'«S ac oocu ac 1_2—3!
It-
.V your pets. It's as easy as
^r- Bring a bag.
"^.ii Clean it up.
Z:\ Dispose of waste
iSS,properly in toilet or
itrash,
How can YOU help keep the environment clean?
r,t^jif,;^ Having a clean environment
ImISj'lS of primary importance for
li^p'Sur health and economy,
h IT:. . Clean watenways provide
; commercial opportu n ities,
.. . recreation, fish habitat and
i."-4>'i add beauty toour
'ff',,--.'.-
f-f i'rit^-Vlandscape. YOU can help
j:-,-*;;.?.. - keep our croeks, lagoons
i^^f^- and ocean clean by
applying the following tips:
1ft .
Carry a plastic bag when
W'^L^''. walking pets and be sure to pick up
• 'after them.
^^sf ' • • Clean up pet waste in your yard
j^fe-;.-frequentiy.
^^tW^i • Pick up after your pets before
^iM'^^-'vCleaning patios, driveways and
p|jDther hard surfaced areas. Never
^4.b.ose pet waste into the street or
gutter.
The best way to dispose of pet waste
is to flush it down the toilet because
it gets treated by a sewage treatment
plant.
Other disposal methods for pet
waste include sealing it in a bag and
placing in trash or burying small
quantities in your yard to
decompose. Be sure to keep it away
from vegetable gardens.
A Clean Environment is
Important to All of UsI
In the C^ity of Carlsbad, storm
drains flow directly into local
creeks, lagoons and the ocean
without treatment. Storm water
pollution is a serious problem for
our natural environment and for
people who live near streams or
wetlands.
Storm water pollution comes from
a variety of sources including oil,
fuel, and fluids, from vehicles and
heavy equipment, pesticide runoff
from landscaping, and from
materials such as concrete,
mortar and soil from construction
activities.
The City of Carlsbad is committed
to improving water quality and
reducing the amount of pollutants
that enter our precious
waterways.
^'•protec<^°'
Storm Water Protection Program
stormwater@ci.carlsbad.ca.us
760-602-2799
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
^ ^Printed on recycled paper
It's All Just Water,
Isn't It?
Only Rain in the Storm Drain!
How Do I 6ct Rid of Chlorine? Pool Filters
Although we enjoy the fun and relaxing times
in them, the water used in swimming pools
and spas can cause problems for our creeks,
lagoons and the
ocean if not
disposed of
properly. When
you drain your
swimming pool,
fountain or spa
to the street, the high concentrations of
chlorine and other chemicals found in the
water flows directly to our storm drains.
bid you know that these storm drains are
NOT connected to sanitary sewer systems
and treatment plants? The primary purpose
of storm drains is to carry rainwater away
from developed areas to prevent flooding.
Improperly disposing of swimming pool and
spa water into storm drains may be harmful
to the environment.
Best Management Practices
Best Management Practices or BMPs are
procedures that help to prevent pollutants
like chlorine and sediment from entering our
storm drains. Each of us can do our part to
keep storm water clean. Using BMPs adds up
to a pollution solution!
Pool and spa water may be discharged to the
storm drain if it has been properly
dechlorinated and doesn't contain other
chemicals. The good news is that chlorine
naturally dissipates over time. Monitor and
test for chlorine levels in thc pool over a
period of 3 to 5 days. Drain the water
bcforc algae starts to grow.
Consider hiring a professional pool service
company to clean your pool, fountain, or spa
and make sure they dispose of the water and
solids properly. For more information about
discharging wastewater to the sanitary
sewer, please
contact the
Encina
Wastewater
Authority at
(760)438-
3941.
Before you discharge your swimming pool
or spa water to the storm drain, thc
water:
• Must not contain chlorine, hydrogen
peroxide, acid, or any other chemicals.
• Can not carry debris or vegetation.
• Should have an acceptable pH of 7-8.
• Can not contain algae or harmful bacteria
(no "green" present).
• Flow must bc controlled so that it does
not cause erosion problems.
Clean filters over a lawn or other landscaped
area where the discharge can be absorbed.
Collect materials on filter cloth and dispose into
the trash. Diatomaceous earth cannot be
discharged into the street or storm drain
systems. Dry it out as much as possible, bag it
in plastic and dispose into the trash.
Acid Washing
Acid cleaning wash water is NOT allowed into
thc storm drains. Make sure acid washing is
done in a proper and safe manner that is not
harmful to people or the environment. It may be
discharged into the sanitary sewer through a
legal sewer connection after the pH has been
adjusted to no lower than 5.5 and no higher
than 11.
bo the Job Right!
• Use the water for irrigation. Try draining
de-chlorinated pool water gradually onto a
landscaped area. Water discharged to
landscape must not cross property lines and
must not produce runoff.
• Do not use copper-based algaecides.
Control algae with chlorine or other
alternatives to copper-based pool chemicals.
Copper is harmful to the aquatic
environment.
• During pool construction, contain ALL
materials and dispose of properly.
Materials such as cement, Gunite, mortar,
and sediment must not be discharged into
the storm drains.
IpT connected to sanitary sewer
"systems and treatment plants? The
primary purpose of storm drains is to
carry rainwater away from developed
,„„^j- areas to prevent flooding. Untreated
W^^.'-^- storm water and the pollutants it
carries flow directly into creeks,
laqoons and the ocean.
v'X- 'a:
In recent years, sources of water
• pollution like industrial waters from
'factories have been greatiy reduced.
*" However, now the majority of water
pollution occurs from things like cars
leaking oil, fertilizers from farms and
gardens, failing septic tanks, pet waste
"ind residential car washing into the
Storm drains and into the ocean and
^aten/vays.
Ei^'All these sources add up to a pollution
• problem! But each of us can do our
rr; part to help clean up our water and
||';i.that adds up to a pollution solution!
Car washir
courtesy of i
Quality Cons
cooperative
between thejj
State Departf
Ecology, Kinf
the cities of 1
Seattle and
City of Car
1635 Farac
Carlsbad
Storm Wat^
760-602-2:
^^^^^^
car washing?
If:''-
How can YOU help keep the environment clean?
y^^'i^=>.There's no problem with washing your
""car. It's just how and where you do it.
''. . Most soap contains phosphates and
. ' other chemicals that harm fish and
i.'^'V^,;'-': water quality. The soap, together with
f':kiAl the dirt, metal and oil washed from
.your car, flows into nearby storm
drains which run directly into lakes,
rivers or marine waters.
The phosphates from the soap can
iCauSe excess algae to grow. Algae
!lobk bad, smell bad, and harm water
quality. As algae decay, the process
j|?'?uses up oxygen in the water that fish
"Fish don't
like to swim in
soap!"
O o
o o
'Having a clean environment
jis of primary importance for
: our health and economy.
Clean waten/vays provide
commercial opportunities,
recreation, fish habitat and
•i:add beauty to our
lahdscape. YOU can help
keepour ocean, creeks and
lagoons clean by applying
mj, the following tips:
^''» Use soap sparingly.
• Use a hose nozzle with a trigger to
save water.
• Pour your bucket of soapy water
down the sink when you're done, not
• jn the street.
Ste/. Avoid using engine and wheel
clBaners or degreasers.
^Take your car to a commercial car
gv'Wash, especially if you plan to clean
the engine or the bottom of your car.
Most car washes reuse wash water
several times before sending it to the
sewer system for treatment.
• Hire only mobile detail operators
that will capture wash water and
chemicals. It is unlawful for
commercial vehicle washing
operators to allow wash water to
enter the storm drain system.
What you should know
before using Concrete
and Mortar ...
In the City of Carlsbad, storm drains flow
directly into local creeks, lagoons and the
ocean without treatment. Storm water
pollution is a serious problem for our
natural environment and for people who
live near streams or wetlands. Storm
water pollution comes from a variety of
sources including oil, fuel, and fluids,
from vehicles and heavy equipments,
pesticide runoff from landscaping, and
from materials such as concrete and
mortar from construction activities. The
City of CaHsbad is committed to
improving water quality and reducing the
amount of pollutants that enter our
precious waterways.
A Clean Environment is
Important to All of Us!
City of Carlsbad
I 1635 FaradayAvenue
Carlsbad, CA 92008
Storm Water HOTIine: 760-602-2799
stormwater@ci.carlsbad.ca.us
March 2003
nly Rain in the Storm Drain!
Pollution Prevention is up
to YOU!
Did you know that storm drains are NOT
connected to sanitary sewer systems or
treatment plants? The primary purpose of
storm drains is to carry rainwater away
from developed areas to prevent flooding.
Untreated pollutants
such as concrete and
mortar flow directly
into creeks, lagoons
and the ocean and
are toxic to fish,
wildlife, and the
aquatic environment.
Disposing of these materials into storm
drains causes serious ecological
problems—and is PROHIBITED by law.
Do the Job Right!
This brochure was designed for do-it-
yourself remodelers, homeowners, masons
and bricklayers, contractors, and anyone
else who uses concrete or mortar to
complete a construction project. Keep
storm water protection in mind whenever
you or people you hire work on your house
or property.
STORM WATER HOTLINE
760-602-2799
Best Management Practices
Best Management Practices
or BMPs are procedures and
practices that help to prevent
pollutants such as chemicals,
concrete, mortar, pesticides,
waste, paint, and other
hazardous materials from entering our storm
drains. All these sources add up to a
pollution problem. But each of us can do
our part to keep storm water clean. These
efforts add up to a pollution solution!
What VOU Can Po:
• Set up and operate small mixers on tarps
or heavy plastic drop cloths.
• Don't mix up more fresh concrete or
mortar than you will need for a project.
• Protect applications of fresh concrete
and mortar from rainfall and runoff until
the material has dried.
• Always store both dry and wet materials
under cover, protected from rainfall and
runoff and away from storm drains or
waterways.
• Protect dry materials from wind. Secure
bags of concrete mix and mortar after
they are open. Don't allow dry products
to blow into driveways, sidewalks,
streets, gutters, or storm drains.
• Keep all construction debris away from
the street, gutter and storm drains.
• Never dispose of washout into the
street, storm drains, landscape drains,
drainage ditches, or streams. Empty
mixing containers and wash out chutes
onto dirt areas that do not flow to
streets, drains or waterways, or allow
material to dry and dispose of properiy.
• Never wash excess material from
bricklaying, patio, driveway or sidewalk
construction into a street or storm drain.
Sweep up and dispose of small amounts
of excess dry concrete, grout, and
mortar in the trash.
• Wash concrete or brick areas only
when the wash water can flow onto a
dirt area without further runoff or drain
onto a surface which has been bermed
so that the water and solids can be
pumped off or vacuumed up for proper
disposal.
• Do not place fill material, soil or
compost piles on the sidewalk or street.
• If you or youncontractor keep a
dumpster at your site, be sure it is
securely covered with a lid or tarp
when not in use.
• During cleanup, check the street and
gutters for sediment, refuse, or debris.
Look around the corner or down the
street and clean up any materials that
may have already traveled away from
your property.
A clean environment is important to all of us!
Did you know that storm drains are
^j€i^;N0T connected to sanitary sewer
l^i'systems and treatment plants?
@^*7he primary purpose of storm drains
^"n£.js to carry rainwater away from
^^^eveloped areas to prevent flooding.
Untreated storm water and the
lljl^;pollutants It carries, flow directly into
'creeks, lagoons and the ocean.
iMin recent years, sources of water
pollution like industrial waters from
factories have been greatly reduced.
However now, the majority of water
^H^pollution occurs from things like cars
leaking oil, fertilizers from famis and
p^gardens, failing septic tanks, pet
waste and residential car washing into
V j^the storm drains and into the ocean
^'and watenways.
^All these sources add up to a pollution
^^roblem! But each of us can do small
^things to help clean up our water and
ttllat adds up to a pollution solution!
What's the problem with fertilizers
and pesticides?
Fertilizer isn't a problem—IF it's used
carefully. Ifyou use too much
fertilizer or apply it at the wrong time,
it can easily wash off your lawn or
garden into stonn drains and then
flow untreated into lakes or streams.
Just like in your garden, fertilizer in
lagoons and streams makes plants
grow. In water bodies, extra fertilizer
can mean extra algae and aquatic
plant growth. Too much algae harms
water quality and makes boating,
fishing and swimming unpleasant. As
algae decay, they use up oxygen in
the water that fish and other wildlife
need.
Fertilizer photo is used courtesy
of the Water Quality Consortium,
a cooperative venture between
the Washington State Department
of Ecology, King County and the
cities of Bellevue, Seattle and
Tacoma.
'"^^Proteo*""'
Storm Water HOTIine: 760-602-2799
stormwate r@>ci .carl s bad .ca.us
City of Carlsbad
1635 FaradayAvenue
Carlsbad CA 92008
www.ci.carlsbad.ca.us
^^Printsd on recycled paper
How can YOU help keep the environment clean?
Ww/•'•
^V^'Having a clean environment is of
ys^^rimary importance for our health and
p^^economy. Clean waterways provide
I^&ommercial opportunities, recreation,
>fish habitat and add beauty to our
^landscape. YOU can help keep our
I'fjSWjiilcreeks, lagoons and ocean clean by
^!H,'a^plylng the following tips:
Don't blow or rake leaves and other
'yard waste into the street or gutter.
Recycle yard waste or start your own
compost pile.
i^DBn't over irrigate. Use drip
irrigation, soaker hoses or micro-
spray system and water eariy in the
morning.
If you have a spray head sprinkler
system; consider adjusting your
.watering method to a cycle and
soak. Instead of watering for 15
minutes straight, break up the
session into 5 minute inten/als
allowing water to soak in before the
next application.
Keep irrigation systems well-
maintained and water only when
needed to save money and prevent
over-watering.
Use fertilizers and pesticides
sparingly.
Have your soil tested to determine
the nutrients needed to maintain a
healthy lawn.
Consider using organic fertilizers—
they release nutrients more slowly.
Leave mulched grass clippings on
the lawn to act as a natural fertilizer.
• Use pesticides only when absolutely
necessary. Use the least toxic
product intended to target a specific
pest, such as insecticidal soaps,
boric acid, etc. Always read the label
and use only as directed.
• Use predatory insects to control
harmful pests when possible.
• Properiy dispose of unwanted
pesticides and fertilizers at
Household Hazardous Waste
collection facilities.
For more information on
landscape irrigation, please
call 760-438-2722.
Master Gardeners
San Diego County has a
Master Gardener program
through the University of
California Cooperative
Extension. Master
Gardeners can provide good information
about dealing with specific pests and
plants. You may call the Master
Gardener Hotline at 858-694-2860 or
check out their website at
www.masterqardenerssandieqo.orq.
The hotline is staffed Monday—Friday,
9 am—3 pm, by experienced gardeners
who are available to answer specific
questions. Information from Master
Gardeners is free to the public. •i
m m
•^4
m
'if:
iUn medio ambiente limpio es importante para todos!
I' .^'^Sabla usted que los desagues de
'i lluvla 6 alcantarillas no estan
L-^'^conectadas al sistema de drenaje
p:-^sanitarlo 6 a las plantas de tratamiento
^-,"!''-. de aguas negras?
'Kf^-. La funcion principal del desagiie 6 las
p.'vig^alcantarillas es remover el agua de lluvia y
hST^'^asi evitar inundaciones. El agua que entra
r>:':-^en los desagues va directamente a los
fi.-:' arroyos Uigos y el oceano junto con la
contaniinacion depositada en las
^^alcantarillas y las calles.
•'. En estos Has la contaminacion del agua
r: • causada flirectamente por fabricas e
K industnas se ha reducido
[•f; .- significantemente. Ahora la mayorla de la
g;SS*contaminaci6n del agua origina de can^os
pA. que tiran aceite, el sobre uso de
K-^-"' fertilizantes para plantas, tanques
[f^'fr 'sfepticos dafiados, suciedad de animates y
lavado de carros en zonas residenciales.
Tocos estos contaminantes se acumulan
vl^^en los desagues 6 alcantarillados y son
, acarreados directamente al oceano
cuando llueve.
En suma todos contribuimos a un gran
^problema de contaminaci6n. jPero cada
^urto de nosotros puede hacer algo para
imp'ar el agua y participar en la soluci6n
la contaminaci6n!
i,Cua\ es el problema creado por el
uso de fertilizantes y pestlcidas?
El fertilizante no es un problema SI se
usa con cuidado. Usar un exceso de
fertilizante 6 en la temporada incorrecta
resulta en el que el fertilizante se deslave
con la lluvia y se vaya por el desagiie 6
alcantarillas a nuestros arroyos, lagos y
el oceano.
Los fertilizantes en nuestros lagos y
arroyos hacen que las plantas crezcan,
tai como en el jardin. Pero en el oceano
el fertilizante causa que las algas y
plantas acu^ticas sobrecrezcan. Y el
exceso de algas marinas pueden ser
dariinas a la calidad del agua y causar
que la pesca, natacion y navegacion
sean desagradables. Al echarse a perder
las algas consumen el oxigeno del agua
que los peces y otros animates necesitan
para sobrevivir.
La fotografi'a al frente es cortesfa
del Consorcio de Calidad de
Agua, en cooperacion con el
Departamento Ecologico del
Estado de Washington, el
Condado de King, y las ciudades
de Bellevue, Seattle y Tacoma.
Linea de Asistencia: 760-602-2799
stormwater@ci.carlsbad.ca.us
Ciudad de Carlsbad
1635 FaradayAvenue
Carlsbad CA 92008
www.ci.carlsbad.ca.us
^ ^Printed on recycled paper
P5"i?|^>?i^i-;r;;.>f?f,L:=;:*'^V''^
•j"iMblo Lluvia en el-Alcdntanllado'"*
•.'SF.--«e
jUsted puede ayudar a mantener nuestro medio ambiente limpio!
Mantener el medio ambiente limpio es
muy importante para nuestra salud y la
I- economia. Conservar el agua limpia
proporcioiia oportunidades para usos
j^'sVc&merciales, recreativos, habitat para
'A^"^ peces y aves, y agrega belleza a
^^;nuestro paisaje. Todos podemos ayudar
^^^a mantener los aroyos, las iagunas, y el
oceano limpios sencillamente siguiendo
estos consejos:
Al barrer o usar maquinas
sopladbras no pennita que las hojas
de artiol y el cesped recien cortado
ehtren en las alcantarillas o el
desague.
Es preferible, convertir estos
desperdicios del jardin en abono.
Usar sistemas de irrigacion de goteo
y otras tecnicas de conservacibn del
agua son altamente recomendables.
Es preferible regar por la mafiana.
Los sistemas de riego automatico
S'^HiJi'f'son mSs eficientes si se programan
Jji con ciclos de cinco minutos y mas
{ecuentemente para que el agua
nedezca bien la tien'a.
Mantener los sistemas de irrigacidn
limpios y en buenas condiciones es
importante para reducir el
desperdicio del agua. Regar
solamente cuando sea necesario
reduce el uso del agua y ahon'a
dinero.
Para m^s infomiacion sobre
sistemas de riego llame al
760438-2722.
Los pestlcidas y fertilizantes deben
usarse solamente cuando sea
absolutamente necesario.
Para mantener un pasto saludable
se recomienda hacer un analisis de
la tierra para detenninar cuales
fertilizantes aplicar y en que
temporada.
Es recomendable usar fertilizantes
organicos en vez de productos
quimicos.
En ocasiones se puede dejar el sacate
recien cortado sobre el pasto ya que
actiia como un fertilizante natural.
El uso de pestlcidas debe ocurrir solo
como ultimo recurso. Es preferible
usar productos que sean bajos en
toxicos, porejemplojabones
insecticidas, acido borico, etc. Seguir
las instmcciones en la etiqueta y usar
el producto correctamente evita
contaminar el agua de riego y lluvia.
Cuando sea posible es preferible usar
insectos predadores para controlar
plagas.
Los pestlcidas y fertilizantes
vencidos deben desecharse
legalmente llevandolos a los
centres de coleccion de
substancias toxicas
localizados en varies
ciudades del condado de
San Diego. Llame al
760-602-2799 para obtener
mas informacion.
Master Gardeners
El condado de San Diego y la Universidad
de Califomia Extension Cooperativa, han
creado el programa de Master Gardener.
Los expertos de este programa estein
disponibles para proporcionar informacion
sobre plantas y plagas. Usted puede
llamar a la linea de Master Gardeners al
858-694-2860 de lunes a viemes entre
9am y 3pm para obtener respuestas a sus
preguntas. La pagina Internet www,
masterqardenerssandieqo.orq es otro
recurso con informacion sobre estos
temas. Esta informacion es totalmente
gratis al publico.
La Suvera
Storm Water Management Plan
CHAPTER 7 - TREATMENT CONTROL BMP DESIGN
CURB INLET FILTER TREATMENT UNITS
7.1 - BMP Locations
Three (3) curb/catch basin inlet treatment filter BMPs have been proposed to treat
85*^ percentile runoff from the site. These units are located at the three curb inlets of
the proposed La Suvera development prior to discharging to the existing storm drain
systems.
7.2 - Determination of Treatment Flows
To determine the Design Treatment Flow for the FloGard treatment units, the 85*
percentile design runoff has been calculated using the Rational Method. Required
data for the Rational Method Treatment flow determination is as follows:
Area Drainage Area
(acres)
85**' Percentile
Rainfall
(inches/hour)
Runoff
Coefficient
85**' Percentile
Flow (cfs)
North Curb
Inlet 1 1.6 0.2 0.52 0.2
North Curb
Inlet 2 1.4 0.2 0.52 0.2
South Catch
Basin Inlet 0.5 0.2 0.52 0.1
Based on the County of San Diego's 6-hour rainfall distribution, the Rational Method
predicts a peak first flush flow rates of 0.2 cfs for each ofthe northern curb inlets and
0.1 cfs forthe southern storm drain inlet The corresponding peak hourly rainfall
intensity was calculated to be 0.2 inches per hour. This peak rainfall intensity was
calculated by adding the incremental rainfall depths within the most intense hour of
rainfall (between hour 2 and 3 of the 6-hour distribution). A mnoff coefficient of 0.52
was assumed for the proposed single-family residential development, based on
County of San Diego criteria.
The 85'*^ percentile, 24-hour rainfall was derived from the isopluvial map provided by
the County of San Diego (attached).
DE:de H:\REPORTS\2470\02\SWMP03.doc
w.o.2470-2 4/21/2005 12:24 PM
..^ J>\—
\ '
"L cmr OF
M SAN MARCOS
^ \ ^
\ \
CHY OF ENONrTAS N—^
VICINITY MAP
PROJECT BOUNDARY-
LEGEND
WATERSHED BOUNDARY
WATER TREATMENT UNIT
BMP EXHIBIT MAP FOR
LA SUVERA
CITYOFCARLSBAD, CALIFORNIA
SHEET
1
OF
1
R:\OOO€\Ahyd\OO6$H05-LA^SUVaiA^BUP.dwg[ 2085]Apr-21-2005:12:35
85TH PERCENTILE PEAK FLOW AND VOLUME DETERMINATION
Modified Rational Method - Effective for Watersheds < 1.0 mi^
Hunsaker & Associates - San Diego
Note: Only Enter Values in Boxes - Spreadsheet Will Calculate Remaining Values
Project Name La Suvera 1 Work Order 2470-2 1
Jurisdiction City of Carisbad 1
BMP Location |8-inch Stonn Drain
85th Percentile Rainfall = 0.64 1
(from County Isopluvial Map)
-Developed Drainage Area = 0.5
Natural Drainage Area = 0.0
Total Drainage Area to BMP = 0.5
Dev. Area Percent Impervious = 30 1
Overall Percent Impervious = 30
Dev. Area Runoff Coefficient = 0.52
Nat. Area Runoff Coefficient = 0.35
Runoff CoefFicient = 0.52
Time of Concentration = 10.0 1
acres
acres
acres
%
(from Drainage Study)
RATIONAL METHOD RESULTS
Q = CIA where
V = CPA wtiere
Q = 85th Percentile Peak Flow (cfs)
C = Runoff Coefficient
I = Rainfall Intensity (0.2 inch/hour per RWQCB mandate)
A = Drainage Area (acres)
Q = 85th Percentile Runoff Volume (acre-feet)
C = Runoff Coefficient
P = 85th Percentile Rainfall (inches)
A = Drainage Area (acres
Using the Total Drainage Area:
C = 0.52
1 = .0.2 inch/hour
P = 0.64 inches
A = 0.5 acres
Q =
V =
0.05 cfs
0.01 acre-feet
Using Developed Area Only:
C =
1 =
P =
A =
Q =
V =
0.52
0.2 inch/hour
0.64 inches
0.5 acres
0.05 cfs
0.01 acre-feet
85TH PERCENTILE PEAK FLOW AND VOLUME DETERMINATION
Modified Rational Method - Effective for Watersheds < 1.0 ml^
Hunsaker & Associates - San Diego
Note: Only Enter Values in Boxes - Spreadsheet Will Calculate Remaining Values
Project Name La Suvera 1 Work Order 2470-2 1
Jurisdiction City of Carisbad 1
BMP Location [Curb Inlet T"
85th Percentile Rainfall = 0.64 1
(from County Isopluvial Map)
Developed Drainage Area = 1.6
Natural Drainage Area = 0.0
Total Drainage Area to BMP = 1.6
Dev. Area Percent Impervious = 30 1
Overall Percent Impervious = 30
Dev. Area Runoff Coefficient = 0.52
Nat. Area Runoff Coefficient = 0.35
Runoff Coefficient = 0.52
Time of Concentration = 10.0 1
(from Drainage Study)
RATIONAL METHOD RESULTS
acres
acres
acres
Q = CIA where
V = CPA where
Q = 85th Percentile Peak Flow (cfs)
C = Runoff Coefficient
I = Rainfall Intensity (0.2 inch/hour per RWQCB mandate)
A = Drainage Area (acres)
Q = 85th Percentile Runoff Volume (acre-feet)
C = Runoff Coefficient
P = 85th Percentile Rainfall (inches)
A = Drainage Area (acres
Using the Total Drainage Area:
C =
1 =
P =
A =
Q =
V =
0.52
0.2 inch/hour
0.64 inches
1.6 acres
0.17 cfs
0.05 acre-feet
Using Developed Area Only:
C =
1 =
P =
A =
Q =
V =
0.52
0.2 Inch/hour
0.64 inches
1.6 acres
0.17 cfs
0.05 acre-feet
85TH PERCENTILE PEAK FLOW AND VOLUME DETERMINATION
Modified Rational Method - Effective for Watersheds < 1.0 mi^
Hunsaker & Associates - San Diego
Note: Only Enter Values In Boxes - Spreadsheet Will Calculate Remaining Values
Project Name La Suvera |
Work Order 2470-2 j
Jurisdiction City of Carisbad
BMP Location iCurt) Inlet 2
85th Percentile Rainfall = 0.64 1
(from County Isopluvial Map)
Developed Drainage Area = 1.4
Natural Drainage Area = 0.0
Total Drainage Area to BMP = 1.4
Dev. Area Percent Impervious = | 30 j
Overall Percent Impervious = 30
Dev. Area Runoff Coefficient = 0.52
Nat. Area Runoff Coefficient = 0.35
Runoff Coefficient = 0.52
Time of Concentration = 10.0 1
(from Drainage Study)
RATIONAL METHOD RESULTS
acres
acres
acres
%
Q = CIA where
V = CPA where
Q = 85th Percentile Peak Flow (cfs)
C = Runoff Coefficient
I = Rainfall Intensity (0.2 inch/hour per RWQCB mandate)
A = Drainage Area (acres)
Q = 85th Percentile Runoff Volume (acre-feet)
C = Runoff Coefficient
P = 85th Percentile Rainfall (inches)
A = Drainage Area (acres
Using the Total Drainage Area:
C =
P:
A:
Q =
V =
0.52
0.2 inch/hour
0.64 inches
1.4 acres
0.15 cfs
0.04 acre-feet
Using Developed Area Only:
C =
1 =
P =
A =
Q =
V =
0.52
0.2 inch/hour
0.64 inches
1.4 acres
0.15 cfs
0.04 acre-feet
Ro-Gard+Rus Filter installed
F/o-Gard™ +P/iys
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 wtiile retaining sediment and larger floatables (debris & trash)
AND allows sustained maximum design flows under extreme weather conditions.
Flo-Gard™ +Plus inserts are available in sizes to fit most industry-standard drainage inlets (...flat grated, combination,
curb and round inlets).
Flo-Gard™ -^PIus 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 vehide parking lots, aircraft ramps, truck
and bus storage yards, corporation yards, subdivision streets and public streets.
Questions? Contact Kristar at (800) 579-8819. 05/03/04
Flo-Gard+Plus Filter
installed
SPECIFIER CHART
Model Na
Inlet Width
(in)
Solids Storage
Capacity (cuft)
Filtered Row
(cfei
Total Bypass
Can. (cfe)
FGP-24Ct 24 0.9 0.8 5.6
FGP.30Ct 30 1.1 1.0 6.7
FGP-36a 36 1.4 1.2 7.9
FGP42a 42 1.6 ^A 8.8
FGP-«a 48 1.9 1.5 9.9
FGP-5.0CI 60 2.3 1.8 11.6
FGP.6.0CI 72 2.8 2.2 13.8
FGP-7.0CI 84 3.2 2.5 15.9
FGP.8.0CI 96 3.7 2.9 18.0
FGP-10.0CI 120 4.6 3.5 21.9
FGP-12.0a 144 5.6 4.2 26.2
FGP-14.0a 168 6.5 4.9 30.1
FGP-16.0a 192 7.5 5.6 344
FGP-18.0a 216 8.3 6.2 38.2
FGP-21.0CI 252 9.7 7.2 44.3
FGP-28.0a 336 13.0 9.5 58.6
NOTES:
1. storage capacity reflects 80% of maximum solids
collection prior to impeding filtering l)ypass.
Z HKered flow rate includes a safety factor of 2.
3. Flo-Gard+Phis Catch Basin Filter inserts are availalie
in the standard sizes (see aiwve) or in custom sizes.
Cal fbr details on custom size inserts.
4. Availalile with recessed mount package including fg
tray alowing maintenance access from manhole.
5. Flo.Gard+Plus filter inserts should toe used in conjunction
with a regiiar maintenance program. Referto
manufacturer's [scommended maintenance guidelines.
us PATENT
FLO-GARD™+PLUS
CATCH BASIN FILTER INSERT
(Curb Mount)
CURB INLET
KriStar Enterprises, Ina, Santa Rosa, CA (800) 579-8819 05/04
Flo-Gard-i-Plus Filter
installed
Model No.
Inlet ID
(In X In)
Grate OD
(In X In)
Solids Storage
Capacity (cuft)
FiHered Flow
(cfe)
Total Bypass
Cap. (cfe)
FGP-12F 12x12 14x14 0.3 0.4 2.8
FGP-1530F 15x30 16x36 23 1.6 6.9
FGP-16F 16x16 18x18 0.8 0.7 4.7
FGP-18F 18x18 20x20 0.8 0.7 4.7
FGP-1822F 20x24 18x22 2.1 1.4 5.9
FGP-1824F 16x22 20x24 1.5 1.2 5.0
FGP-1836F 18x36 18x40 2.3 1.6 6.9
FGP-2024F 20x24 22x24 1.2 1.0 5.9
FGP-21F 22x22 24x24 2.2 1.5 6.1
FGP-2142F 21x42 26x42 4.3 2.4 9.1
FGP-24F 24x24 26x26 2.2 1.5 6.1
FGP-2436F 24x36 24x40 3.4 2.0 8.0
FGP-2445F 24x45 26x47 4.4 2.4 9.3
FGP-2448F 24x48 26x48 4.4 2.4 9.3
FGP-28F 28x28 30x30 2.2 1.5 6.3
FGP-30F 30x30 30x34 3.6 2.0 8.1
FGP-36F 36x36 36x40 4.6 2.4 9.1
FGP-3648F 36x48 40x48 6.8 3.2 11.5
FGP-48F 48x48 48x52 9.5 3.9 13.2
NOTES:
1. Storage capacity reflects 80% of maximum saNds
colection priorto Impeding filtering bypass.
Z Filtered flow rate Includes a safety fiictor of Z
3. FloOanHPIus Catcti Basin Filter inserts are available
In the standard sizes (see above) or In custom sizes.
Call for detals on custom size Inserts.
4. Flo^Sardiflus fliter Inserts should be used kicoiilunctlon
wtth a regular maintenance program. Referto
manufacturer's recommended maintenance guidelines.
US PATENTT
FLO-GARD™+PLUS
CATCH BASIN FILTER INSERT
(Frame Mount)
FLAT GRATED INLET
KriStar Enterprises, Inc., Santa Rosa, CA (800) 579-8819
0904
La Suvera
Storm Water Management Plan
Chapter 8 - FISCAL RESOURCES
8.1 Fiscal Mechanism Selection
The table below illustrates the maintenance mechanism selection criteria and
its associated fiscal funding source. The shaded portion ofthe table
highlights the mechanism associated with the La Suvera Development.
»»»»»»»Increased rislc, complexity, cost or other maintenance factors»»»»»»»»>
(Public Responsibility)
Third Category Fourth Category
Warrants Flood
Control Dist. (FCD)
assuming
responsibility, with
funding related to
project
Broader public
responsibility for
maintenance and
funding (beyond
project)
[Second cat. plus:]
Wetland swale or
bioretention;
Detention basin
(extended/dry); Wet
ponds & wetlands;
Multiple storm drain
inserts; Filtration
Systems
[Third cat. plus:]
Retrofit public
storm drain
inserts, etc.
Master plan
facility
that serves area
larger than project
1. Dedication to FCD.
2. Formation of
benefit area
3. FCD maintenance
documentation
1. Dedication to
FCD or
County.
FCD / County
maintenance
documentation
Start-up interim:
Developer fee
covering 24 months
of costs
Permanent:
FCD Assessment
per FCD Act Sec
105-17.5
Varies: gas tax for
BMP in road
ROW, Transnet
for CIP projects.
Special funding or
General funding
for others.
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La Suvera
Storm Water Management Plan
8.2 Agreements (Mechanisms to Assure Maintenance)
There are three (3) FloGard curb inlet filter units on the proposed La Suvera
site for storm water quality treatment. Multiple storm drain insert units fall
within maintenance category two based on the City's Guidelines for the
Stormwater Maintenance Plan.
Funding for all water quality treatment devices is provided by the Home
Owners Association of the La Suvera development. The Home Owners
Association will be responsible to perform the maintenance activities and to
ensure adequate funding. The maintenance agreement(s) will be found with
the Home Owners Association's secretary.
The City of Carisbad Watershed Protection, Stormwater Management, and
Discharge Control Ordinance require ongoing maintenance of BMPs to
ensure the proper function and operation of theses BMPs. Costs for this
maintenance will be the responsibility ofthe Home Owners Association and
by the contractor during construction of the development. The treatment units
will require maintenance activities as outiined in Section 5 ofthis report. The
approximate total annual cost for maintenance will be $1,980 (referto Chapter
5).
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La Suvera
Storm Water Management Plan
Chapter 9 - REFERENCES
"Standard Urban Storm Water Mitigation Plan - Storm Water Standards", City of
Carisbad, April 2003.
"Standards for Design and Construction of Public Works Improvements in the City of
Carlsbad", City of Carisbad, California; April 1993.
"Master Drainage and Storm Water Quality Management Plan", City of Carisbad,
California; March 1994.
"Improvement Plans for Redeemer-By-The-Sea Lutheran Church of Carlsbad",
Sowards & Brown Engineering, Inc; 4/14/03.
"Hydrology Manual", County of San Diego Department of Public Works - Flood
Control Division; Updated April 1993.
"San Diego County Hydrology Manual", County of San Diego Department of Public
Works - Flood Control Section; June 2003.
"Order No. 2001-01, NPDES No. CAS0108758 - Waste Discharge Requirements for
Discharges of Urban Runoff from the Municipal Separate Storm Sewer Systems
(MS4s) Draining the Watersheds ofthe County of San Diego, the Incorporated Cities
of San Diego County, and San Diego Unified Port District" California Regional
Water Quality Control Board - San Diego Region; February 21, 2001.
"Water Quality Plan for the San Diego Basin", California Regional Water Quality
Control Board - San Diego Region, September 8,1994.
"Studies Show Sweeping has Beneficial Impact on Stormwater Quality - APWA
Reporter^, Sutheriand, R.C, and S.L. Jelen. 1996.
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