HomeMy WebLinkAboutCT 02-07; EMERALD POINTE ESTATES; STORM WATER MGMT PLAN; 2005-08-16STORM WATER
MANAGEiVIENT PLAN
for
EiVIERALD POINTE
CT 02-07
City of Carlsbad, California
Prepared for:
RWR Homes, Inc.
3130 Bonita Road
Suite 200 B
Chula Vista, CA 91910
w.o. 2339-19
August 16, 2005
r
Eric Mosolgo, R.C.E.
Water Resources Department Manager
Hunsaker & Associates San Diego, Inc.
CO
3
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Emerald Pointe
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 Bacteria & Viruses
3.8 Pesticides
3.9 Organic Compounds
3.10 Metals
CHAPTER 4 - Conditions of Concern
4.1 Receiving Watershed Descriptions
4.2 Pollutants of Concern in Receiving Watersheds
4.3 Identification of Primary & Secondary Pollutants of Concern
4.4 Identification of Conditions of Concern
CHAPTER 5 - Flow-Based BMPs
5.1 Design Criteria
5.2 CDS Treatment Units
5.3 Pollutant Removal Efficiency Table
5.4 Maintenance Requirements
5.5 Operations and Maintenance Plan
5.6 Scheduie of Maintenance Activities
5.7 Annual Operations & Maintenance Costs
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1 Emerald Pointe
• Storm Water Management Plan
• CHAPTER 6 - Source Control BMPs
6.1 Landscaping
• 6.2 Urban Housekeeping
1 6.3 Automobile Use
6.4 Integrated Pest Management Principles
• 6.5 Stenciling and Signage
• 6.6 Trash Storage Areas
6.7 Efficient Irrigation Practices
' CHAPTER 7 - Site Design BMPs
1 '^•^ Site Design BMPs
• 7.2 Minimize Impervious Footprint
7.3 Conserve Natural Areas
1 '^-^ Permeable Pavements
• 7.5 Minimize Directly Connected Impervious Areas
7.6 Slope & Channel Protection / Hillside Landscaping
1 Residential Driveways & Guest Parking
_ CHAPTER 8 - Treatment Control BMP Design (CDS Treatment Unit)
8.1 BMP Location
_ 8.2 Determination of Treatment Flows
1 8.3 CDS Treatment Unit Selection
8.4 BMP Selection Discussion
8.4.1 Extended Detention Basins
8.4.2 Vegetated Swales
8.4.3 Infiltration Basins
8.4.4 WetPonds
I 8.4.5 Media Filters
8.4.6 Drainage Inserts
8.4.7 Hydrodynamic Separator Systems
CHAPTER 8 - Fiscal Resources
1 8.1 Fiscal Mechanism Selection
8.2 Agreements (Mechanisms to Assure Maintenance)
CHAPTER 9 - References
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Emerald Pointe
Storm Water Management Plan
List of Tables and Figures
Chapter 1 - Watershed Map
Chapter 2 - Storm Water Requirements Applicability Checklist
Chapter 3 - Pollutant Category Table
Chapter 4 - San Diego Region Hydrologic Divisions
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 - San Diego County Soils Exhibit
Chapter 5 - Pollutant Removal Efficiency Table (Flow-Based BMPs)
Chapter 8 - BMP Location Map
Chapter 8 - Design Runoff Determination Summary Table
Chapter 8 - CDS System Data
Chapter 9 - Maintenance Mechanism Selection Table
Attachments
BMP Location Map
San Diego RWQCB Basin Plan Map
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Emerald Pointe
Storm Water Management Plan
CHAPTER 1 - EXECUTIVE SUIVIMARY
1.1 - Introduction
The 18-acre Emerald Pointe project site is located west ofthe Cobblestone Drive
and Sapphire Drive intersection, bound by the existing Cobblestone Sea Village
residential development to the east and Cobblestone Road to the south within the
City of Carlsbad, California (see Vicinity Map on this page).
ClPf OF
SAN MARCOS
CITy OF ENCINITAS
VICINITY MAP
NOT TO SCALE
All runoff from the project site will drain to the existing 24-inch RCP storm drain
within Cobblestone Drive, ultimately draining to Encinas Creek. Runoff from Encinas
Creek eventually discharges into the Pacific Ocean.
Per the City of Carlsbad SUSMP, the Emerald Pointe 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 set forth by
the Regional Water Quality Control Board's Order No. 2001-01, and the City of
Carlsbad SUSMP.
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Emerald Pointe
Storm Water Management Plan
This SWMP recommends the location and sizing of site Best Management Practices
(BMPs) which include a single flow based treatment unit. See BMP Location Map in
this chapter.
Furthermore, this report determines anticipated project pollutants, pollutants of
concern in the receiving watershed, peak flow mitigation, recommended source
control BMPs, and methodology used forthe design of flow-based BMPs.
1.2 - Summarv of Pre-Developed Conditions
The proposed Emerald Pointe project site is located on an existing natural hilltop.
Runoff currently discharges down the slopes of this hillside to the receiving curb and
gutter within Cobblestone St located to the south of the project site.
A 24-inch storm drain, located to the east ofthe within Cobblestone Drive conveys
flow in a south westerly direction towards the intersection of Cobblestone Drive and
Cobblestone St. Flow from this 24-inch storm drain system ultimately discharges to
the Encinas Creek.
The Regional Water Quality Control Board has identified Encinas Creek as part of
the Carlsbad Hydrologic Unit, Encinas Hydrologic Area, and the Canyon de las
Encinas Subarea (basin number 904.40).
1.3 - Summarv of Proposed Development
Development ofthe 4.7-acre area will consist of 14 single family residences, foot
paths, communal open space and underground utilities with a single entrance from
the adjacent Cobblestone Drive.
Runoff generated bythe proposed Emerald Pointe development will be conveyed in
an easterly direction via curb and gutter within the proposed Sapphire Court,
draining to an onsite detention basin located to the east of the project site. Routed
developed flow will then exit the basin and drain to the existing 24-inch storm drain
located within Cobblestone Drive.
85'^ percentile runoff from the proposed Emerald Pointe development will be treated
via a single CDS treatment unit (or an approved, equivalent flow based treatment
unit) priorto discharge to the receiving detention basin.
Based on 2003 County of San Diego criteria, runoff coefficient of 0.52 was assumed
for the proposed single family residential development.
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WATERSHED MAP FOH
EMERALD POINTE
CITY OF CARLSBAD, CAUFORNIA
Emerald Pointe
Storm Water Management Plan
1.4 - Results and Recommendations
A single flow-based BMP has been proposed to treat 85'^ percentile runoff from the
site prior to discharge to the proposed detention basin.
To determine the Design Treatment Flow for the flow based treatment unit, the 85"^
percentile design runoff has been calculated using the Rational Method.
Table 1 - Developed Conditions 85*'' Percentile Calculations
BMP
Drainage
Area
(acres)
Rainfall
Intensity
(inches/hour)
Runoff
Coefficient
85'" Pet.
Design Flow
(cfs)
CDS Unit 4.9* 0.2 0.52 0.5
Rational Method calculations predicted an 85*^ percentile runoff flow of roughly 0.5
cfs for the area discharging to the proposed BMP treatment unit Calculations show
that a CDS PMSU 20_15 (or an approved, equivalent flow based treatment unit) has
sufficient treatment capacity in order to treat this developed flow (refer to Chapter 7).
It should also be noted that the proposed CDS treatment unit is upstream of the
onsite detention basin such that all treatment flows pass through the basin prior to
discharge from the project site. As such, 85*^ percentile flows will receive passive
treatment from the vegetated base of the detention basin and also minor detention
caused by the 6-inch exit orifice.
1.5 - Conclusion
The combination of proposed construction and permanent 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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-PROJECT BOUNDARY
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It 1 i'? m-U ////"•
>^5-;. •••-•>s:-
CITY OF SAN MARCOS
CfTY OF ENCINrTAS
VICINITY MAP
NOT TO SCALE
I.
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coe
0.5 cft.
.9ac.
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LEGEND
WATERSHED BOUNDARY
WATER QUAUTY UNIT
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PREPARED BY:
HUNSAKER
& ASSOCIATES
BMP LOCATION EXHIBIT FOR
EMERALD POINTE ESTATES
CITY OF CARLSBAD, CALIFORNIA
Emerald Pointe
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 priorto 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-constmction 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 stmctural BMPs shall be located to infiltrate, filter, or treat the required mnoff
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 Emerald Pointe project is classified as a
Priority Project and subject to the City's Permanent Storm Water BMP
Requirements. These requirements required the preparation of this 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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Stonn Water Standards
4/03/03
Vl. RESOURCES & REFERENCES
APPENDIX A
STORM WATER REQUIREMENTS APPUCABILITY CHECKLIST
Complete Sections 1 and 2 of the following checklist to determine your project's
permanent and construction storm water best management practices requirements.
This form must be completed and submitted with your permit application.
Section 1. Permanent Storm Water BMP Requirements:
If any answers to Part A are answered "Yes," your project is subject to the "Priority
Project Pemianent Storm Water BMP Requirements," and "Standard Permanent Storm
Water BMP Requirements" in Section 111, "Permanent Storm Water BMP Selection
Procedure" in the Sform Water Standards manual.
If all answers to Part A are "No," and any answers to Part B are "Yes," your project is
only subject to the "Standard Pennanent Storm Water BMP Requirements". If every
question in Part A and B is answered "No," your project is exempt from permanent
storm 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 i/
2 Attached residential development of 10 or more units
3 Commercial development greater than 100,000 square feet
4. Automotive repair shop
5. Restaurant
6 Steep hillside development qreater than 5,000 square feet
7 Project discharging to receivinq waters within Environmentally Sensitive Areas
8. Parking lots greater than or equal to 5,000 ff* or with at least 15 parking spaces, and
potentially exposed to urban runoff
9. Streets, roads, highways, and freeways which would create a new paved surface that is
5.000 sauare feet or greater
/
* Refer to the definitions section in the Storm Water Standards for expanded definitions of the pnonty
project categories. —. —
Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered
priority projects. Parking lots, buildings and other stmctures associated with utility projects are
priority projects if one or more of the criteria in Pari: A is met. If all answers to Part A are "No",
continue to Part B. -. —
30
Storm Water Standards
4/03/03
Does the project propose: Yes No
1. New impen/ious areas, such as rooftops, roads, parking lots, driveways, paths and
sidewalks?
2. New pervious landscape areas and in-igation systems?
3. Permanent structures within 100 feet of any natural water body?
4. Trash storage areas?
5. Liquid or solid material loading and unloading areas?
6. Vehicle or equipment fueling, washing, or maintenance areas?
7. Require a General NPDES Pennit for Stonn Water Discharges Associated with
Industrial Activities (Except construction)?*
8. Commercial or industrial waste handling or storage, excluding typical office or
household waste?
9. Any qradinq or ground disturbance during construction?
10. Anv new stomn drains, or alteration to existing storm drains?
*To find out if your project is required to obtain an individual General NPDES Permit for Stomn Water
Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site
at, www.swrcb.ca.gov/stormwtr/industrial.html
Section 2. Construction Storm Water BMP Requirements:
If the answer to question 1 of Part C is answered "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Storm Water Pollution Prevention Plan (SWPPP). Ifthe answerto question 1 is "No,"
but the answer to any of the remaining questions is "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No,"
your project is exempt from any construction storm water BMP requirements. If any of
the answers to the questions in Part C are "Yes," complete the construction site
prioritization in Part D, below.
Part C: Determine Construction Phase Storm Water Requirements.
Would the project meet any of these criteria during construction? Yes No
1. Is the project subject to California's statewide General NPDES Permit for Stomn Water
Discharges Associated With Constmction Activities? —
2. Does the project propose grading or soil disturbance? •
3. Would stomn water or urban mnoff have the potential to contact any portion of the
constmction area, including washing and staging areas?
/
4. Would the project use any constmction materials that could negatively affect water
quality if discharged from the site (such as, paints, solvents, concrete, and
stucco)?
/
31
Storm Water Standards
4/03/03
Part D: Determine Construction Site Priority
In accordance with the Municipal Permit, each construction site with construction storm
water BMP requirements must be designated with a priority: high, medium or low.
This prioritization must be completed with this form, noted on the plans, and included in
the SWPPP or WPCP. Indicate the project's priority in one ofthe check boxes using the
criteria below, and existing and surrounding conditions of the project, the type of
activities necessary to complete the construction and any other extenuating
circumstances that may pose a threat to water quality. The City resen/es the right to
adjust the priority of the projects both before and during construction. [Note:
The construction priority does NOT change constmction 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 1V.1 for more details on construction BMP
requirements.]
A) High Priority
1) Projects where the site is 50 acres or more and grading will occur during the
rainy season
2) Projects 5 acres or more. 3) Projects 5 acres or more within or directly
adjacent to or discharging directly to a coastal lagoon or other receiving water
within an environmentally sensitive area
Projects, active or inactive, adjacent or tributary to sensitive water bodies
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) Permit projects in the public right-of-way where grading occurs, such as
installation of sidewalk, substantial retaining walls, curb and gutter for an
entire street frontage, etc. , however SWPPPs are not required.
3) Permit projects on private property where grading permits are required,
however, Notice Of Intents (NOIs) and SWPPPs are not required.
• C; Low Priority
1) Capital Projects where minimal to no grading occurs, such as signal light and
loop installations, street light installations, etc.
2) Permit projects in the public right-of-way where minimal to no grading occurs,
such as pedestrian ramps, driveway additions, small retaining walls, etc.
3) Permit projects on private property where grading permits are not required,
such as small retaining walls, single-family homes, small tenant
improvements, etc.
32
Emerald Pointe
Storm Water Management Plan
CHAPTER 3 - IDENTIFICATION OF TYPICAL POLLUTANTS
3.1 - Anticipated Pollutants from Project Site
The following table details typical anticipated and potential pollutants generated by
various land use types. The Emerald Pointe development will consist of detached
single-family residences. Thus, the Detached Residential Development category
has been highlighted to clearly illustrate which general pollutant categories are
anticipated from the project area.
General Pollutant Categories
Priority
Project
Categories Sediments Nutrients Heavy Metajs Organic Compounds Trash & Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides ,;, i
Attached
Residential
Development
X X X p(i) p(2) P X
Commercial
Development
>100,000 ft^
p(1) p(i) p(2) x p(5) x p(3) p(5)
Automotive
Repair
Shops
X x X
Restaurants X x x X
Hillside
Development
>5,000 ft^
X X X x x X
Parking Lots pd) p(1) X x pd) X pd)
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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Emerald Pointe
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 mnoff 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 - Oxvaen-Demanding Substances
Biodegradable organic material as well as chemicals that react with dissolved
oxygen in water to form 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 of the water body, as well as the water
quality.
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Emerald Pointe
Storm Water Management Plan
3.7 - Bacteria & Viruses
Bacteria and vimses are ubiquitous micro-organisms that thrive under certain
environmental conditions. Their proliferation is typically caused by the transport of
animal or human fecal wastes from the watershed. Water, containing excessive
bacteria and viruses can alter the aquatic habitat and create a harmful environment
for humans and aquatic life. Also, the decomposition of excess organic waste
causes increased growth of undesirable organisms in the water.
3.8 - 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 mnoff containing toxic levels of its active component.
3.9 - Organic Compounds
Organic compounds are carbon-based. Commercially available or naturally
occurring organic compounds are found in pesticides, solvents and hydrocarbons.
Organic compounds can, at certain concentrations, indirectly or directly constitute a
hazard to life or health. When rinsing off objects, toxic levels of solvents and
cleaning compounds can be discharged to storm drains. Dirt, grease and grime
retained in the cleaning fluid or rinse water may also adsorb level of organic
compounds that are harmful or hazardous to aquatic life.
3.10-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 metal products. Metals of concern
include cadmium, chromium, copper, lead, mercury and zinc. Lead and chromium
have been used as corrosion inhibitors in primer coatings and cooler tower systems.
At low concentrations naturally occurring in soil, metals are not toxic. However, at
higher concentrations, certain metals can be toxic to aquatic life. Humans can be
impacted from contaminated groundwater resources, and bioaccumulation of metals
in fish and shellfish. Environmental concerns, regarding the potential for release of
metals to the environment, have already led to restricted metal usage in certain
applications.
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Emerald Pointe
Storm Water Management Plan
CHAPTER 4 - CONDITIONS OF CONCERN
4.1 - Receivinq Watershed Descriptions
As shown in the watershed map on the following page, the pre-developed Emerald
Pointe site drains to Encinas Creek which eventually discharges to the Pacific
Ocean.
Development ofthe site will not cause any diversion to or from the existing
watershed to the storm drain system.
The Regional Water Quality Control Board has identified Encinas Creek as part of
the Carlsbad Hydrologic Unit, Encinas Hydrologic Area, and the Canyon de las
Encinas Subarea (basin number 904.40).
4.2 - Pollutants of Concern in Receiving Watersheds
Encinas Creek is not listed on the EPA's 303(d) List of endangered watenways
(included in this Chapter). Per the "Water Quality Plan for the San Diego Basin", the
beneficial uses for the Canyon de las Encinas include possible contact water
recreation, non-contact recreation, warm freshwater habitat and wildlife habitat.
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 ofthe Encinas hydrologic area.
4.3 - Identification of Primarv & Secondarv Pollutants of Concern
As stated above in segment 4.2, the project site does not discharge to an EPA
303(d) listed watenway.
Thus, the Emerald Pointe Estates produces no primary pollutants of concern.
Secondary pollutants generated by the project site are sediments, nutrients, heavy
metals, organic compounds, trash and debris, oxygen demanding substances, oil &
grease, bacteria & viruses and pesticides.
4.4 - Identification of Conditions of Concern
The "Drainage Study for Emerald Pointe Estates", prepared by Hunsaker &
Associates and dated June 2005, details the storm drain design and hydrology for
the proposed project.
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I " 1
Table 2-2. BENEFICIAL USES OF INLAND SURFACE WATERS
1,2
Inland Surface Waters Hydrologic Unit
B^sin Number
BENEFICIAL USE
1,2
Inland Surface Waters Hydrologic Unit
B^sin 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 Dlego Coiihty Coastai Streams - continued
Buena Wsfa Lagoon 4.21 See Coastal Waters- Table 2-3
Buena Vlsta Creek 4.22 + • • • • •
Buena Vlsta Creek 4.21 + • • • • • • •
Agua Hedionda 4.31 See Coastai 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 Endnas 4.40 + 0 • • •
San Marcos Creek Watershed
Batiquitos Lagoon 4.51 See Coastal Waters- Table 2-3
San Marcos Creek 4.52 + • • • •
unnamed Intermittent streams 4.53 + • • • • •
San Marcos Creek Watershed
San Marcos Creek 4.51 + • • • • •
Encinitas Creek 4.51 + •
i
• • • •
• Existing Beneficial Use
0 Potential Beneficial Use
+ Excepted From MUN (See Text)
1 Waterbodies are listed multiple times If they cross hydrologic area or sub area boundaries.
Beneficial use designations apply to all tributaries to the indicated waterbody, if not listed separately.
Table 2-2
BENEFICIAL USES
March 12, 1997
2-27
Table 3-2. WATER QUALITY OBJECTIVES
Concentrations not to be exceeded more than 10% of the time during any one ona year period.
Const tiuent (mg/L or as notad)
Inland Surface Waters Hydrologic
Unit Basin
Number
TDS Cl SO 4 %Na N&P l^e Mn MBAS B ODOR Turb
NTU
Color
Units F
SAN LUIS REY HYDRGLOQIC 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 1.0
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 nona 20 20 1.0
CARLSBAD HYDROLOGIC UNIT 904.00
Loma Alta HA 4.10 ---------nona 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 4.30 509 250 250 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 4.6Q 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
SAN DIEGUITO HYDROLOGIC UNIT 90B.00
Solana Beach HA 5.10 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
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 0.06 0.5 0.75 nona 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
PENASQUITOS HYDROLOGIC UNIT 906.00
1 Miramar Reservoir HA 6.10 500 250 250 60
t
a 0,3 0.05 0.5 0.75 none 20 20 1.0
1 Poway HA 6.20 500 250 250 60 a 0.3 0.05 0.5 0.75 none 20 20 1.0
HA - Hydrologic Araa
HSA - Hydrologic Sub Area (Lowar case letters indicate endnotes following the table.)
Tabla 3-2
WATER QUAUTY OBJECTIVES Page 3-23 Saptamber 8, 1994
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DEEGO REGIONAL WATER QUALITY CONTROL BOARD
Approved by USEP.4:
July 2003
I'KioKirv^ si/L.MircrFD
9 R Agua Hedionda Creek
9 E Agua Hedionda Lagoon
9 R Aliso Creeic
9 E Aliso Creek (mouth)
9 E Buena Vista Lagoon
90431000
90431000
90113000
90113000
90421000
Total Dissolved Solids Low 7 Miles
Bacteria Indicators
Sedimentation/Siltation
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Nonpoint/Point Source
Nonpoint/Point Source
Bacteria Indicators
Urban Runoff/Storm Sewers
Unknown point source
Nonpoint/Point Source
Phosphorus
ImpairmenI located al lower 4 miles.
Urban Runoff'Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low
Low
Medium
Low
Toxicity Low
6.8 Acres
6.8 Acres
mmmsmmm
19 Miles
19 Miles
19 Miles
Bacteria Indicators
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Medium
Nonpoint/Point Source
Bacteria Indicators
Nutrients
Nonpoint/Point Source
Low
Low
Estimated size of impairment is ISO acres located in upper portion of lagoon.
Nonpoint/Point Source
Sedimentation/Siltation Medium
Nonpoint/Point Source
0.29 Acres
Idl Acres
202 Acres
202 Acres
Page 1 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
USEP.L-
July 200}
Chollas Creek
R Cloverdale Creek
B Dana Point Harbor
E Famosa Slough and Channe!
90822000
Bacteria Indicators
Cadmium
Copper
Diazinon
Lead
Zinc
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
High
High
High
High
1.2 Miles
1.2 Miles
1.2 Miles
1.2 Miles
1.2 Miles
2004
2004
2002
2004
2004
90S32000
Phosphorus
Total Dissolved Solids
High 1.2 Miles
Low 1.2 Miles
Urban Runof£'Storm Sewers
Unknown Nonpoint Source
Unknown point source
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low 1.2 Miles
90114000
Bacteria Indicators Medium
Impairment located at Baby Beach.
Urban Runoff/Storm Sewers
Marinas and Recreational Boating
Unknown Nonpoint Source
Unknown point source
119 Acres
90711000
Eutrophic Low 32 Acres
Nonpoint Source
Page 2 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
Approved by USEPA:
July 2003
^^S^^^^ikkil^l"! isyy ^MLMAIID. ,-..l'KOr()SLUi|:|MI)j.>:
5Pl«r^ii?>;i^M Vll KMfLIH I'OILUl \M SlKt-S'^OK V,<-- »«>M)l'IU . ' "PUIORIIV M/L \H K JU) ' (.OMPI HION '
R Felicita Creek
R Forester Creek
9 R Green Valley Creek
9 L Guajome Lake
90523000
90712000
90511000
90311000
Total Dissolved Solids Low 0.92 Miles
Agricultural Return Flows
Urban Runoff/Storm Sewers
Flow Regulation/Modification
Unknown Nonpoint Source
Unknown point source
Fecal Coliform
ImpairmenI Locaied at lower I mile.
Urban Runoff/Storm Sewers
Spills
Unknown Nonpoint Source
Unknown point source
pH
Impairment Located at tipper 3 miles.
Industrial Point Sources
Habitat Modification
Spills
Unknown Nonpoint Source
Unknown point source
Total Dissolved Solids
ImpairmenI Locaied al lower I mile.
Agricultural Return Flows
Urban RunoffStorm Sewers
Flow Regulation/Modification
Unknown Nonpoint Source
Unknown point source
Medium 6.4 Miles
Low 6.4 Miles
Low 6.4 Miles
Sulfates Low 1.2 Miles
Eutrophic
iSM-. ..U.L..... ..• . , I i..'s.i .....'.-J .... * ... . .W. . .
Urban Runoff/Storm Sewers
Natural Sources
Unknown Nonpoint Source
Unknown point source
Nonpoint/Point Source
Low 33 Acres
Page 3 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
Hodges, Lake
Kit Carson Creek
Loma Alta Slough
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
USEPA:
July 2003
.\\\iMi'»iirn3#5H>u.ni.\.\'i/i:i'Rissoi<-^^^ - -y. PRIOKIIY-"-si/r \ritrrM) < OMPI tiioi^^J
90521000
90521000
90410000
Color
Nitrogen
Phosphorus
Total Dissolved Solids
Total Dissolved Solids
Bacteria Indicators
Eutrophic
Low 1104 Acres
Low 1104 Acres
Low 1104 Acres
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Agriculture
Dairies
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Agriculture
Dairies
Urban RunofCStorm Sewers
Unknown Nonpoint Source
Unknown point source
Agricultural Return Flows
Urban Runoff/Storm Sewers
Flow Regulation/Modification
Natural Sources
Unknown Nonpoint Source
Unknown point source
Low 1104 Acres
Low 0.99 Miles
Agricultural Return Flows
Urban Runoff/Storm Sewers
Flow Regulation/Modification
Unknown Nonpoint Source
Unknown point source
Low 8.2 Acres
Nonpoint Source
Low 8.2 Acres
Nonpoint Source
Page 4 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT ^^^''^ July 2003
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
'•^r^AME'llPl^^lpPg^Pv^ I'RIOKin 'M/l VllUf JM) - (.OMPI I.UD.V
E Los Penasquitos Lagoon
...
9 B Mission Bay
90610000
90640000
Sedimentation/Siltation
«M iv.fr ito«e«iii
Low 469 Acres
Nonpoint/Point Source
Medium 2032 Acres Bacteria Indicators
Impairment locaied along entire bay shoreline.
Nonpoint/Point Source
Eutrophic Low 2032 Acres
Estimated area of impairment of 0.5 acres located at mouth of Rose Creek and 0.5 acres locaied at mouth of Tecolote Creek.
Nonpoint/Point Source
Lead Low 2032 Acres
Estimatedareaof impairment of O.S acres locaied at mouth of Rose Creek and O.S acres locaied at mouth of Tecolote Creek
Nonpoint/Point Source
R Murrieta Creek 90252000
Phosphorus Low
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
——, :—I— #
12 Miles
C Pacific Ocean Shoreline, Aliso HSA 90113000
Bacteria Indicators Medium 0.65 Miles
ImpairmenI locaied al Laguna Beach at Lagunita Place /Blue Lagoon Place, Aliso Beach.
Nonpoint/Point Source
9 C
Pacific Ocean Shoreline, Buena Vista Creek 90421000
HA
Pacific Ocean Shoreline, Dana Point HSA 90114000
Bacteria Indicators Low 1.2 Miles
Impairment located at Buena Vista Creek Carlsbad Cily Beach at Cartsbad Village Drive, Carlsbad Stale Beach at Pine
Avenue.
Nonpoint/Point Source
i\ . :uajt
Medium 2 Miles Bacteria Indicators
Impairment located at Aliso Beach al Wesl Streel, Aliso Beach al Table Rock Drive, 1000 Steps Beach at Pacific Coast Hwy
(Hospital, 9th Ave), Salt Creek (large outlet). Salt Creek Beach at Sail Creek service road. Salt Creek Beach al Dana
Strand Road.
mmmmmsmmsmsm
Nonpoint/Point Source
mmmmssmtms
Page S of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
.Approved by USEPA:
Juty 2003
ii^C^fSUM^^'W^^^^h^^^^'ii*'^ '"--...^IMDL '^'UMIMVIH) ^.I'UOI'OSI U A7JL-
.\\\II.R?Il^^sML^rlA^^s^BFyio^^ f*^-'.. ..••••pKioui'iY'^s-M/K.Mii'f IID (OMPII inWi'-l
C Pacific Ocean Shoreline, Escondido Creek
HA
90461000
C Pacific Ocean Shoreline, Laguna Beach HSA 90112000
C Pacific Ocean Shoreline, Loma Alta HA
C Pacific Ocean Shoreline, Lower San Juan
HSA
90410000
90120000
C Pacific Ocean Shoreline, Miramar Reservoir
HA
90610000
C Pacific Ocean Shoreline, San Clemente HA 90130000
C Pacific Ocean Shoreline, San Diego HU 90711000
Bacteria Indicators
Impairment located at San Elijo Lagoon outlet.
Nonpoint/Point Source
0.44 Miles
Bacteria Indicators Medium 1.8 Miles
Impairment located al Main Laguna Beach, Laguna Beach at Ocean Avenue, Laguna Beach at Laguna Avenue, Laguna
Beach at Cteo Slreet, Arch Cove at Bluebird Canyon Road, Laguna Beach al Dumond Drive.
Nonpoint/Point Source
Bacteria Indicators
ImpairmenI located at Loma Alia Creek Mouth.
Nonpoint/Point Source
Low 1.1 Miles
rjMiHiMimmmm
Medium 1.2 Miles Bacteria Indicators
Impairment located at North Beach Creek San Juan Creek (large outlet), Capistrano Beach, South Capistrano Beach at
Beach Road.
Nonpoint/Point Source
Bacteria Indicators Low 0.39 Miles
Impairment located at Torrey Pines State Beach al Del Mar (Anderson Canyon).
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Bacteria Indicators Medium 3.7 Miles
ImpairmenI located at Poche Beach (large oullel), Oie Hanson Beach Club Beach ai Pico Drain, San Clemente City Beach
at El Portal Sl. Stairs, San Clemente City Beach at Mariposa St., San Clemente City Beach at Linda Lane, San Clemente
City Beach at South Linda Lane, San Clemente City Beach at Lifeguard Headquarlers, Under San Clemente Mimicipal
Pier, San Clemente City Beach at Trafalgar Canyon (Trafalgar Ln.), San Clemente State Beach at Riviera Beach, San
Clemente State Beach at Cypress Shores.
Nonpoint/Point Source
Bacteria Indicators
Impairment located al San Diego River Mouth (aka Dog Beach).
Nonpoint/Point Source
Medium 0.37 Miles
Page 6 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
Approved by USEPA:
Juty 2003
VI'W.\'T.|»dfesr^ T^Sm^.j''^' VQUMI-V'-'N*** '*r. IMDL.'/*f' l.'»"V\MD I'UOPO.Sl U^J MpL*
l\\ VIFIWUI'li'^l'"'lXM.V.NJ..S'IKlShOK'*%i!f!jfi.SO|iK('^^^^ _ PRIORI I Y " M/l \I-M( I U) "(IIMPII HON**"
9 C Pacific Ocean Shoreline, San Diequito HU
9 C Pacific Ocean Shoreline, San Joaquin HiUs
HSA
9 C Paciflc Ocean Shoreline, San Luis Rey HU
9 C Pacific Ocean Shoreline, San Marcos HA
9 C Pacific Ocean Shoreline, Scripps HA
9 C Pacific Ocean Shoreline, Tijuana HU
9 R Pine Valley Creek (Upper)
90511000
90111000
90311000
90451000
90630000
91111000
91141000
Bacteria Indicators Low 0.86 Miles
Impairment located at San Dieguito Lagoon Mouth, Solana Beach.
Nonpoint/Point Source
Bacteria Indicators Low 0.63 Miles
Impairment located at Cameo Cove at Irvine Cove DrJRiviera Way, Heisier Park-North
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Bacteria Indicators
Impairment located at San Luis Rey River Mouth.
Nonpoint/Point Source
Low 0.49 Miles
Bacteria Indicators
Impairment located at Moonlight Slate Beach.
Nonpoint/Point Source
Low 0.5 Miles
Medium 3.9 Miles Bacteria Indicators
ImpairmenI located al La Jolla Shores Beach at El Paseo Grande, La Jolla Shores Beach at Caminito Del Oro, La Jolla
Shores Beach al Vallecitos, La Jolla Shores Beach at Ave de ta Playa, Casa Beach (Childrens Pool), Soulh Casa Beach al
Coast Blvd., Whispering Sands Beach al Ravina St., Windansea Beach at Visla de ta Playa, Windansea Beach al Bonair St.,
Windansea Beach at Playa del Norte, Windansea Beach al Palomar Ave., Tourmaline Surf Park, Pacific Beach al Grand
Ave.
Nonpoint/Point Source
Bacteria Indicators Low
ImpairmenI locaied from the border, exiending north atong Ihe shore.
Nonpoint/Point Source
3 Miles
Enterococci Medium 2.9 Miles
Grazing-Related Sources
Concentrated Animal Feeding Operations
(permitted, point source)
Transient encampments
Page 7 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DEEGO REGIONAL WATER QUALITY CONTROL BOARD
Approved by USEP.-i:
Juty 2003
\Mi: • vv.\.iV- ^' MS" - ^^M^--' - • OTEJS'l I VI . ^ fr^ 'jiVATERSHED rt>I I-lfl \.M »1 Kt SSOK ? ' .SOI l<( I S . •
.t IMDI IMIMAIID I'ltOPOM p'lMJII
'pRIOUin sl/l M 11 ( IID ( OMPI I HON"--
R Prima Deshecha Creek 90130000
Phosphorus
Turbidity
Rainbow Creek 90222000
Nitrogen
Phosphorus
San Diego Bay Shoreline, 32nd St San Diego
Naval Station
90822000
iijmjjhtftK<i>.'i..'«>vi'
San Diego Bay Shoreline, between Sampson
and 28th Streets
90822000
Benthic Community Effects
Sediment Toxicity
. .... ^ • ... ,
Copper
Mercury
PAHs
Low
Low
1.2 Miles
1.2 Miles
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
High 5 Miles 2003
Agricultural Return Flows
Other Urban Runoff
Nurseries
Onsite Wastewater Systems (Septic Tanks)
Nonpoint/Point Source
High 5 Miles 2003
Agricultural Return Flows
Other Urban Runoff
Nurseries
Onsite Wastewater Systems (Septic Tanks)
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
Medium
103 Acres
103 Acres
High
High
High
55 Acres
55 Acres
55 Acres
2003
2003
2003
Page S of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
USE p.4:
Julv 2003
lilg^lSt'^S^." ( \IVVV1H{ V •'H^*' -'^^ii^lipi'lMlAL; < IMIH ISIIMMU) ,1'K()P0M D'IMpX
lipSc'."^*'*^ '^viiKsiiin POIII i\Ni/siHb'W)R''^i'*>*\oi'i« IS •' •' pRiouin si/L\iiiriU) COMPIH'IOIN-"
San Diego Bay Shoreline, Chula Vista
Marina
90912000
San Diego Bay Shoreline, Downtown
Anchorage
90821000
C San Diego Bay Shoreline, G Street Pier 90821000
9 B San Diego Bay Shoreline, near Chollas Creek 90822000
San Diego Bay Shoreline, near Coronado
Bridge
90822000
PCBs
Zinc
Nonpoint/Point Source
Nonpoint/Point Source
Bacteria Indicators
High
High
Low
Urban Runoff/Storm Sewers
Marinas and Recreational Boating
Boatyards
Boat Discharges/Vessel Wastes
Benthic Community Effects
Sediment Toxicity
Bacteria Indicators
Nonpoint/Point Source
Nonpoint/Point Source
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Medium
Medium
Low
Medium
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
55 Acres
55 Acres
2003
2003
0.41 Miles
7.4 Acres
7.4 Acres
0.42 Miles
Benthic Community Effects
Sediment Toxicity
Benthic Community Effects
Sediment Toxicity
Includes Crosby Street/Cesar Chavez Park area, lhat wilt receive additional moniloring.
15 Acres
IS Acres
Medium
Medium
37 Acres
37 Acres
Nonpoint/Point Source
Page 9 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT USEP.-i:
Juty 2003
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
'^^ALw,mKiSfe#?^vA'f^i.^ i^">L ^risiiMMH), • i'i«»i'i«i-u>niDi;
ir w VIIKsui'.ii 'roLi'iii VNI.SIBL.W)R- •••'yi'*,.s'tn i« is • > ' PRIORIIY VSI/I 'vru,c-ihD*-(OMPIFVION^T
9 B San Diego Bay Shoreline, near sub base 90810000
9 B San Diego Bay Shoreline, near Switzer Creek 90821000
B San Diego Bay Shoreline, North of 24tb
Street Marine Terminal
9 B San Diego Bay Shoreline, Seventh Street
Channel
90831000
Benthic Community Effects
Sediment Toxicity
Chlordane
Lindane
PAHs
90832000
Benthic Community Effects
Sediment Toxicity
Benthic Community Effects
Sediment Toxicity
Nonpoint/Point Source
Nonpoint/Point Source
Urban Runofi/Storm Sewers
Other
Boatyards
Nonpoint/Point Source
Urban Runoff/Storm Sewers
Other . ,
Boatyards
Nonpoint/Point Source
Urban Runofi/Storm Sewers
Other
Boatyards
Nonpoint/Point Source
Nonpoint/Point Source
Medium
Medium
Medium
16 Acres
16 Acres
5.5 Acres
Medium 5.5 Acres
Medium 5.5 Acres
Medium
Medium
9.5 Acres
9.5 Acres
Nonpoint/Point Source
Nonpoint/Point Source
Medium
Medium
9 Acres
9 Acres
Nonpoint/Point Source
Page 10 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT "-'^^ '^^^''^ July 2003
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
''f'%.vt viLKsiiiD?^'<)iS.iJi.v?(r/siRuV'joR'/'*"'^'ttM)ri« VS? '.^^^^^ I'MoRm's. sizi/M 11 fTri) -V'cfiMf'i.i I'uTv'w
9 C San Diego Bay Shoreline, Shelter Island
Shoreline Park
9 C San Diego Bay Shoreline, Tidelands Park
9 B
9 R San Diego River (Lower)
90810000
91010000
Bacteria Indicators
Bacteria Indicators
Unknown Nonpoint Source
Unknown point source
Unknown Nonpoint Source
Unknown point source
Low
Low
0.42 Miles
0.38 Miles
a«...k1Cffi.Tfii.:...g.*ift—.to?nnM.wrtf»
San Diego Bay Shoreline, Vicinity of B St 90821000
and Broadway Piers
9 B San Diego Bay, Shelter Island Yacht Basin 90810000
90711000
Bacteria Indicators Low
Estimated size of impairment is 0.4 miles around the shoreline ofthe bay.
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Medium Benthic Community Effects
Sediment Toxicity
Copper, Dissolved
Fecal Coliform
Lower 6 miles.
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
9.9 Acres
9.9 Acres
9.9 Acres
High 153 Acres
Low 12 Miles
Urban RunofCStorm Sewers
Wastewater
Nonpoint/Point Source
Low Dissolved Oxygen
Impairment transcends adjacent Calwater wtareshed 90712.
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low 12 Miles
2003
Page 11 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT ^/^^"^^^^^
9 E San Elijo Lagoon
9 R San Juan Creek
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
July 2003
9 E San Juan Creek (mouth)
9 R San Luis Rey River
90461000
Phosphorus
ImpairmenI transcends adjacent Calwater watershed 90712.
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Total Dissolved Solids
Impairment transcends adjacent Cahvater watershed 90712.
Urban Runoff/Storm Sewers
Flow Regulation/Modification
Natural Sources
Unknown Nonpoint Source
Unknown point source
Bacteria Indicators
Estimated size of impairment is 150 acres.
Nonpoint/Point Source
Eutrophic
Estimated size of impairment is 330 acres.
Nonpoint/Point Source
Sedimentation/Siltation
Estimated size of impairment is ISO acres.
Nonpoint/Point Source
Low
Low
12 Miles
12 Miles
90120000
Bacteria Indicators
Low
Low
Medium
Medium
566 Acres
566 Acres
566 Acres
1 Miles
Nonpoint/Point Source
90120000
90311000
Bacteria Indicators Medium 6.3 Acres
Nonpoint/Point Source
Chloride
Impairment tocated at tower 13 miles.
Urban Runofi/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Low 19 Miles
Page 12 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT »^^^^^
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
July 2003
jWATER|l|li^PPORyt^r?f/^'ESSC>R
9 R Sandia Creek
9 E Santa Margarita Lagoon
9 R Santa Margarita River (Upper)
9 R Segunda Deshecha Creek
90222000
90211000
90222000
90130000
Total Dissolved Solids Low 19 Miles
Total Dissolved Solids
Eutrophic
Phosphorus
Industrial Point Sources
Agriculture-storm runoff
Urban RunofC/Storm Sewers
Surface Mining
Flow Regulation/Modification
Natural Sources
Golfcourse activities
Unknown Nonpoint Source
Unknown point source
Urban Runoff/Storm Sewers
Flow Regulation/Modification
Natural Sources
Unknown Nonpoint Source
Unknown point source
Nonpoint/Point Source
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
m^msmmammmmmmim'sm
Low 1.5 Miles
Low 28 Acres
Low 18 Miles
Phosphorus
Turbidity
Urban Runofi/Storm Sewers
Unknown Nonpoint Source
Unknown point source
Construction/Land Development
Urban RunofCStorm Sewers
Channelization
Flow Regulation/Modification
Unknown Nonpoint Source
Unknown point source
Low
Low
0.92 Miles
0.92 Miles
Page 13 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
SAN DEEGO REGIONAL WATER QUALITY CONTROL BOARD
Approved by USEPA:
Juty 2003
Sutherland Reservoir 90553000
Color Low 561 Acres
9 R Tecolote Creek
R Tijuana River
.-ta'j-. i:ijam«...>^.-:^r-...,.x.ji'M*-iv..-iUj.,'.-» -.^-3iai
90650000
Bacteria Indicators
Cadmium
Copper
Lead
Toxicity
Zinc
Urban Runoff/Storm Sewers
Unknown Nonpoint Source
Unknown point source
91111000
Bacteria Indicators
Eutrophic
Low Dissolved Oxygen
Pesticides
Solids
Synthetic Organics
Trace Elements
Trash
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Nonpoint/Point Source
Medium
Low
Low
Low
Low
Low
6.6 Miles
6.6 Miles
6.6 Miles
6.6 Miles
6.6 Miles
6.6 Miles
5.8 Miles Low
Low
Low
Low
Low
Low
Low
Low
5.8 Miles
5.8 Miles
5.8 Miles
5.8 Miles
5.8 Miles
5.8 Miles
5.8 Miles
Nonpoint/Point Source
Page 14 of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT
E Tijuana River Estuary
SAN DEEGO REGIONAL WATER QUALITY CONTROL BOARD
WAl I-RSirP,D^J'pUl I, I ^1.51KF<»S0KlP?PsQl Kl LW PRIORI IY Sizr \H I.Cin) <COMPLLI |(jN.-"i|
91111000
Bacteria Indicators
Eslimaied size of impairment is 150 acres.
Nonpoint/Point Source
Eutrophic
Estimated size of impairment is I acre.
Nonpoint/Point Source
Lead
Estimated size of impairment is 1 acre.
Nonpoint/Point Source
Low Dissolved Oxygen
Urban RunofCStorm Sewers
Wastewater
Unknown Nonpoint Source
Unknown point source
Nickel
Estimated size of impairment is 1 acre.
Nonpoint/Point Source
Pesticides
Estimated size of impairment is I acre.
Nonpoint/Point Source
Thallium
Estimated size of impairment is 1 acre.
Nonpoint/Point Source
Trash
Estimated size of Impairment is 1 acre.
Nonpoint/Point Source
Low
Low
Low
Low
Low
Low
Low
Low
1319 Acres
1319 Acres
1319 Acres
1319 Acres
1319 Ac'res
1319 Acres
1319 Acres
1319 Acres
Page IS of 16
2002 CWA SECTION 303(d) LIST OF WATER QUALITY LIMITED SEGMENT ^pp^--">.yosEPA
^ ^ ^ r..i.. 1/1/13
SAN DIEGO REGIONAL WATER QUALITY CONTROL BOARD
July 2003
-PRIORIiY^i/.F«AnrcJ.I u' -.mMriVEicieia
?-vmiRrVivTi<.\^^ggSa»i'-f-^^^
REGIONAL WATER OUALITY CONTROL BOARDS
1 North Coast
2 San Francisco Bay
3 Central Coast
4 Los Angeles
5 Central Valley
6 Lahontan
7 Colorado River Basin
8 Santa Ana
9 San Diego
WATER BODY TYPE
B = Bays and Harbors
C = Coastal Shorelines/Beaches
E = Estuaries
L - Lakes/Reserviors
R = Rivers and Streams
S = Saline Lakes
T= Wetlands, Tidal
W= Wetlands, Freshwater
CALWATER WATERSHED
"Calwater Watershed" is the State Water Resources Control Board hydrological subunit area or an even smaller area delineation.
GROUP A PESTICIDES OR CHEM A
aldrin, dieldrin, chlordane, endrin, heptachlor, heptachlor epoxide,
hexachlorocyclohexane (including lindane), endosulfan, and toxaphene
Page 16 of 16
Emerald Pointe
Storm Water Management Plan
Chapter 5 - FLOW-BASED BMPs
5.1 - Desiqn 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 BMP's 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 Carlsbad, 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.
- Soil Type - Hydrologic soil group D was assumed for all areas. Group D
soils have very slow inflitration 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 nearly impervious materials. Group D soils
have a very slow rate of water transmission. The San Diego County Soils
Map has been attached on the following page with the accompanying
geotechnical investigation exhibit for the proposed Emerald Pointe project
site.
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 - CDS Treatment Units
The Continuous Deflective Separation (CDS) storm water pollution control devices
are designed for the sustainable removal and retention of suspended solids and
floatables from storm water. CDS technology utilizes a non-blocking, non-screening
process to remove pollutants from storm water flow.
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Legend
County of San Diego
Hydrology Manual
Soil Hydrologic Groups
Soil Groups
Group A
Group B
Group C
Group D
Undetermined
Data Unavailable
DPW ^GIS
Wc Have San Dk^a Cavcrcdl
THIS MAP IS PROVIDED WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Copyrighl SanGIS. All Rights Resen/ed.
This products may contain information from ttie SANDAG Regional 'C' Information System which cannot be reproduced without the
written permission of SANDAG.
This product may contain information which has been reproduced with pemiission granted by Thomas Brothers Maps.
3 IVIiles
LEGEND
ASSUMED SUBDIVISION BOUNDARY
APPROXIMATE EXISTING
TOPOGRAPHY (feet)
APPROXIMATE LOCATION OF
T-n EXPLORATORY TT^ENCH
r V
^Geologic Legend
' Geologic Contact
Eocene-age
. Santiago Formation
'^Eocene-age
Del Mar and Friars
ForwaHon
undHlBrentiatad
ll
III ! -f*
AL> , T'3Q V
SCALE: r = YOC
IN.
ir-
i
97-7189-p2
L V
^UtmEL- Tflgg •
REFERENCE: Thfe Plot Plan uia6 prepared From
an exrstfng CAD draiufng File provrded by
Munaaksr 4 Aaaocfate* SD, Inc. and from on-»fte
Ffeld recomaraaancs perFormed by GEI.
NOTE: This Plot Plan is not to be used for lagai
purposes. Locations and dimensions ars cpproxi-
mata. 'Actual property dimensions and locations
of utilities may be obtained from the Approved
Building Plans or the "As-Built" Grading Plans.
PLOT PLAN
and
GEOLOGIC MAP
Proposed Emerald Polnta Estates
APN-212-040-50
Carisbad, CA
Figure No. I
Job No. 97-7189
Geotechnical
Ejqiiorationr inc,
April 2002
Emerald Pointe
Storm Water Management Plan
According to CDS information, these units capture fine sands and solids and are
capable of removing more than 80 percent of annual total suspended solids from
storm water. Additionally, CDS units are reported to remove 100 percent of
floatables as well the following:
100% of all particles in the storm water equal to or greater than one-half the size
of the screen opening
93% of all particles equal to or greater than one-third the size of the
screen opening
53% of all particles equal to or greater than one-fifth the size of the
screen opening
Standard CDS units have no moving parts (they are gravity-driven bythe hydraulic
energy in the storm water flow)), require no power or supporting infrastructure, and
according to CDS information will not clog. Screen and supporting hardware are
made of stainless steel and designed to resist corrosion. The units are installed
below ground.
CDS units have large sump capacities relative to their design flows and only need to
be cleaned out with a standard vactor truck one to four times per year. This
operation eliminates workers' exposure to materials captured in the units.
All 85* percentile runoff from the Emerald Pointe site will be treated via a single
CDS unit
5.3 - Pollutant Removal Efficiencv Table
The table on the following page shows the generalized pollutant removal efficiencies
for hydrodynamic separators. CDS literature states that its units are capable of
removing more than 80 percent of annual total suspended solids from storm water.
5.4 - Maintenance Requirements
Flow-based storm water treatment devices should be inspected periodically to
assure their condition to treat anticipated runoff. Maintenance ofthe proposed CDS
units includes inspection and maintenance 1 to 4 times per year.
Maintenance of the CDS units involves the use of a "vactor truck", which clears the
grit chamber ofthe treatment unit by vacuuming all the grit, oil and grease, and
water from the sump. Typically a 3-man crew is required to perform the
maintenance of the treatment unit.
Proper inspection includes a visual observation to ascertain whether the unit is
functioning properly and measuring the amount of deposition in the unit. Floatables
should be removed and sumps cleaned when the sump storage exceeds 85 percent
of capacity specifically, or when the sediment depth has accumulated within 6 inches
DE:de H:\REPORTS\233aiaSWMP03.doc
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I
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ii
Emerald Pointe
Storm Water Management Plan
of the dry-weather water level. The rate at which the system collects pollutants will
depend more heavily on site activities than the size of the unit.
Maintenance of the site BMPs will be the responsibility of the 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
A schedule for maintenance activities
Name, qualifications, and contact information for the parties responsible for
maintaining the BMPs
For proper maintenance to be performed, the storm water treatment facility must be
accessible to both maintenance personnel and their equipment and materials.
5.5 - Operations and Maintenance Plan
The operational and maintenance needs ofa CDS unit include:
Inspection of structural integrity and screen for damage.
Animal and vector control.
Periodic sediment removal to optimize performance.
Scheduled trash, debris and sediment removal to prevent obstruction.
The facility will be inspected regularly and inspection visits will be completely
documented:
Preventive maintenance activities for a flow-based treatment unit are:
Trash and Debris Removal - trash and debris accumulation will be monitored
during both the dry and wet season and after every large storm event (rainfall
events in excess of 1 inch). Trash and debris will be removed from the CDS
unit annually (at the end ofthe wet season). Trash and debris will also be
removed when material accumulates to 85% of CDS unit's sump capacity, or
when the floating debris is 12 inches deep (whichever occurs first).
Sediment Removal - sediment accumulation will be monitored during both the
wet and dry season, and after every large storm (1.0 inch). Sediment will be
removed from the CDS unit annually (at the end of the wet season).
Sediment will also be removed when material accumulates to 85% of CDS
unit's sump capacity, or when the floating debris is 12 inches deep (whichever
occurs first). Disposal of sediment will comply with applicable local, county,
state or federal requirements.
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Emerald Pointe
storm Water Management Plan
Corrective maintenance is required on an emergency or non-routine basis to
correct problems and to restore the intended operation and safe function of a
CDS unit. Corrective maintenance activities include:
Removal of Debris and Sediment
Structural Repairs - Once deemed necessary, repairs to structural
components of a CDS unit will be completed within 30 working days.
Qualified individuals (i.e., the manufacturer representatives) will conduct
repairs where stmctural damage has occurred.
5.6 - Schedule of Maintenance Activities
CDSPMSU20_15
Target Maintenance Date - March 15""
Maintenance Activity - Annual inspection and cleanout. Clear grit chamber unit
with vactor truck. Perform visual inspection. Remove floatables.
Target Maintenance Dates - 15*^ of each month; October through May (Rainy
Season Inspections)
Maintenance Activity - Regular inspection to ensure that unit is functioning
properly, has not become clogged, and does not need to be cleared out;
5.7 - Annual Operations & Maintenance Costs ^
The following costs are intended only to provide a magnitude ofthe costs involved in
maintaining BMPs. Funding shall be provided by the Home Owners Association for
Emerald Pointe.
Approximate annual maintenance costs for the proposed CDS unit are outlined
below. Costs assume a 3 man crew:
Maintenance for CDS PMSU 20-15:
Periodic Inspection, Maintenance and Monitoring = $800
Annual Cleanout Cost = $1000
Subtotal = $1,800
Contingency = $180
Total = $1,980
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Emerald Pointe
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 stonn 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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Emerald Pointe
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 Homeowners Association will make all homeowners aware of the
aforementioned RWQCB regulations through a homeowners' eciucation program.
6.4 - Integrated Pest Management (IMP) Principles
Integrated pest management (IPM) is an ecosystem-based pollution prevention
strategy that focuses on long-term prevention of pests or their damage through a
combination of techniques such as biological control, habitation 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. More information may be obtained at the UC Davis website
(http://www.ipn.ucdavis.edu/WATER/U/index.html).
IPM is achieved via the following:
- Eliminate and/or reduce the need for pesticide use in the project design by:
(1) Plant pest resistant or well-adapted plant varieties such as native plants.
(2) Discouraging pests by modifying the site and landscape design.
Pollution prevention is the primary "first line of defense" because pollutants
that are never used do not have to be controlled or treated (methods which
are inherently less efficient).
- Distribute IPM educational materials to future site residents/tenants.
Minimally, educational materials must address the following topics:
(1) Keeping pests out of buildings and landscaping using barriers, screens
and caulking.
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Emerald Pointe
storm Water Management Plan
(2) Physical pest elimination techniques, such as, weeding, squashing,
trapping, washing, or pruning out pests.
(3) Relying on natural enemies to eat pests.
(4) Proper use of pesticides as a last line of defense.
6.5 - Storm Water Convevance Systems Stenciling and Signage
The proposed development will incorporate concrete stamping, or equivalent, of all
storm water conveyance system inlets and catch basins within the project area with
prohibitive language (e.g., "No Dumping - I Live in «name receiving water»"),
satisfactory to the City Engineer. Stamping may also be required in Spanish.
6.6 - Trash Storage Areas
All outdoor trash container areas shall meet the following requirements. A "trash
containment area" refers to an area where a trash receptacle or receptacles are
located for use as a repository for solid wastes. Design for such areas will include:
- Paved with an impervious surface, designed not to allow run-on from
adjoining areas, screened or walled to prevent off-site transport of trash.
- Provide attached lids on all trash containers that exclude rain, roof or
awning to minimize direct precipitation.
6.7 - Efficient Irrigation Practices
All Home Owners' Association (HOA) maintained landscaped areas will include rain
shutoff devices to prevent irrigation during and after precipitation. Flow reducers
and shutoff valves triggered by pressure drop will be used to control water loss from
broken sprinkler heads or lines.
•E:de H:\REPORTS\2339M9\SWMP03.doc
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A Clean Environment is
Important to All of Us!
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 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.
'mm:-:
'"'^'•Proteo^^'^
Storm Water Protection Progranri
stormwater@ci.carlsbad.ca.us
760-602-2799
City of Carlsbad
1635 Faraday Avenue
Carlsbad, CA 92008
^ ^Printed on recycled paper
Only Rain in the Storm Drain!
It's All Just Water,
Isn't It?
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.
Did 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 BAAPs 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!
How Do I Gei Rid of Chlorine? Pool Filters
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 the pool over a
period of 3 to 5 days. Drain the water
before 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 thc 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 be controlled so that it does
not cause erosion problems.
Clean filters over a lawn or other landscaped
area where thc 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
fhe 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.
Do the Job Rightl
• 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.
))Sr.you know that storm drains are
fjOT connected to sanitary sewer
Is'j^stems and treatment plants? The
primary purpose of storm drains is to
gprry rainwater away from developed
?*^3reas to prevent flooding. Untreated
^^.^/-fstorm water and the pollutants it
5'. • cairies, flow directly into creeks,
Jagoonsi and the ocean.
§miS30An recent years, sources of water
^ pollution like industrial waters from
«|ifactOFie& have been greatly reduced.
^However now, the majority of water
tion occurs from things like cars
Qgking oil, fertilizers from farms and
^gardens, failing septic tanks, pet waste
% 'and residential car washing into the
l&m drains and into the ocean and
Waterways.
m^r '
nfisse sources add up to a pollution
Slem! But each of us can do small
IHg^tp help clean up our water and
M^'dds up to a pollution solution!
Pet waste photo is used courtesy
ofthe Water Quality Consortium,
a cooperative venture between
the Washington State Department
of Ecology, King County and the
cities of Bellevue, Seattle and
Tacoma.
'^'•Prot^o^^^'^
Storm Water HOTIine: 760-602-2799
stormwater@ci.carlsbad.ca.us
City of Carlsbad
1635 Faraday Avenue
Carlsbad CA 92008
www.ci.carlsbad.ca.us
^ ^Printed on recycled paper
f What's the problem with
4 pet waste?
' Pet waste is a health risk to pets and
people, especially children. It's a
V- , nuisance in our neighborhoods. Pet
ii> : waste IS full of bacteria that can make
people sick. This bacteria gets
^1 ••--''washefl into the storm drain and ends
iSkJi. up in ourcreeks, lagoons and ocean.
)yi.'J. The bacteria ends up in shellfish living
L in these water bodies. People who
M*eat those shellfish may get very sick.
sRreliminarystudies show that dog and
Jpat waste can contribute up to 25% of
Ithejharmful bacteria found in our local
iigoons. '
{ge responsible and clean up after
Tp^ts. It's as easy as 1-2-3! lyour
l^£Bring a bag.
,£lean it up.
}|» Dispose of waste
Saproperly in toilet or
l^trash.
How can YOU help keep the environment clean?
1?
Having a clean environment
IS of primary importance for
our health and economy.
• Clean waterways provide
commercial opportunities,
. recreation, fish habitat and
add beauty to our
• landscape. YOU can help
^. ;keep ourcreeks, lagoons
i'jE^fand'ocean clean by
^^VV?^%)plying the following tips:
• Carry a plastic bag when
walkingipets and be sure to pick up
t'/iifi^V^^ter them.
Clean up pet waste in your yard
tef^^frequently.
I^PicIf up after your pets before
icjeanlng patios, driveways and
Ether-hard surfaced areas. Never
hose pet waste into the street or
^ffier.'
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.
msm
A clean environment Is
Important to all of us!
Did you know that stomi 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
stomn 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 thirigs like cars
leaking oil, fertilizers from famris, 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
probleml 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 DrainI
City of Carlsbad
Storm Water Protection
Program
City of Carlsbad
1635 FaradayAvenue
Carlsbad CA 92008
Storm Water HOTIine:
760-602-2799
K E C V C 1. E
USED Dir.
Funded by a grant
from the California
Integrated Waste
Management Board
Motor Oil
,Only Rain in the Storm DrainI
wm.
City of Carlsbad
Storm Water Protection
Program
Storm Water HOTIine:
760-602-2799 '
-11*
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.
si
13S
Having a clean environment
is of primary importance for
our health and economy.
Clean watenways 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 properly. 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.
4
iUn medio ambiente limpio es importante para todos!
jll^bfa usted que los desagues de
llflyia 6 alcantarillas no estin
Sorifictadas al sistema de drenaje
f^fiitario 6 a las plantas de tratamiento
ijgaguas negras?
ta'funoi^n principal del desague 6 las
'^'Icantaiillas es remover el agua de lluvia y
psl evitar inundaciones. El agua que antra
iM^,los desagiies va directamente a los
'^|rrpyos, lagos y el oceano junto con la
cgn^minacion depositada en las
i|icantarillasylas calles.
if^stos dias la contaminacion del agua
i^sada'dlrectamente por fabricas e
Industrias se ha reducido
jSignificantemente. Ahora la mayoria de la
l&ghlarninacion del agua origina de carros
j^lS'^.tiran aceite, el sobre uso de
!f|[tili2;antes para plantas, tanques
j^^^pticosfdafiados, suciedad de animales y
^I^Va^o de carros en zonas residenciales.
^Jodo's estos contaminantes se acumulan
^'eh-los-desagues 6 alcantarillados y son
*' acarrea Jos directamente al oceano
L^ndo llueve.
Mvna todos contribuimos a un gran
^blemade contaminacibn. |Pero cada
p^^'de nosotros puede hacer algo para
fjpiar el agua y participar en la solucion
g^taminacion!
.f^V- -
^Cual 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 acuaticas sobrecrezcan. Y el
exceso de algas marinas pueden ser
dailinas a la calidad del agua y causar
que la pesca, nataci6n y navegacion
sean desagradables. Al echarse a perder
las algas consumen el oxigeno del agua
que los peces y otros animales necesitan
para sobrevivir.
La fotograffa al frente es cortesfa
del Consorcio de Calidad de
Agua, en cooperacidn con el
Departamento Ecoldgico del
Estado de Washington, el
Condado de King, y las ciudades
de Bellevue, Seattle y Tacoma.
Linea de Asistencia: 760-602-2799
stormwater@ci.carisbad.ca.us
Ciudad de Carlsbad
1635 Faraday Avenue
Carlsbad CA 92008
vwvw.ci.carlsbad.ca.us
Printed on recycled paper
jUsted puede ayudar a mantener nuestro medio ambiente limpio!
^ m:
w^gntener el medio ambiente limpio es
^jpiiy Importante para nuestra salud y la
*^economla. Conservar el agua limpia
^pfoporciona oportunidades para usos
^^^rherciales, recreativos, habitat para
"'^eces y aves, y agrega belleza a
ue$iro pajsaje. Todos podemos ayudar
njaptener los arroyos, las Iagunas, y el
^eano limpios sencillamente siguiendo
Ifs'los consejos:
Al barrer o usar maquinas
'vSopladoras no permita que las hojas
-^{J^^rbol y el cesped recien cortado
^vtentren en las alcantarillas o el
'•desague.
Es preferible, convertir estos
desperdicios del jardin en abono.
Usar Sistemas de irrigacion de goteo
yotras tecnicas de conservacion del
agua son altamente recomendables.
'gg'preferible regar por la maftana.
[^^istemas de riego automatico
mcis eficientes si se programan
Ih'ciclos de cinco minutos y mas
l^uentemente para que el agua
idezca bien la tierra.
m
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 ahorra
dinero.
Para mas infomiaci6n sobre
sistemas de riego llame al
760-438-2722.
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
teinporada.
Es recomendable usar fertilizantes
orgcinicos en vez de productos
quimicos.
En ocasiones se puede dejar el sacate
recien cortado sobre el pasto ya que
actua como un fertilizante natural.
El uso de pestlcidas debe ocurrir solo
como ultimo recurso. Es preferible
usar productos que sean bajos en
toxicos, por ejempio jabones
insecticidas, ^cido b6rico, etc. Seguir
las instrucciones 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 colecci6n de
substancias t6xicas
localizados en varias
ciudades del condado de
San Diego. Llame al
760-602-2799 para obtener
m^s informaci6n.
Master Gardeners
El condado de San Diego y la Universidad-.;^
de California Extension Cooperativa, han*),
creado el programa de Master Gardeqer.i'^J;^
Los expertos de este programa est^n
disponibles para proporcionar informaci6n,ii
sobre plantas y plagas. Usted puede ,
llamar a la linea de Master Gardeners al fi^-,^
858-694-2860 de lunes a viernes entre ^'^^s
9am y 3pm para obtener respuestas a susH'^i'
preguntas. La pagina Internet www. '
masterqardenerssandieqo.orq es otro
recurso con informacion sobre estos
temas. Esta informacion es totalmente
gratis al publico. ' 'J-^^S
-mi
mm
m -r
A clean environment is important to all of us!
Pl^^Did you know that storm drains are
S^QT connected to sanitary sewer
^yijlpms and treatment plants?
he priSiary purpose of storm drains
.ft!; 8^
S.to-carry rainwater away from
developed areas to prevent flooding,
'•"'ntreated storm water and the
^pollutants it carries, flow directly into
"Veeks, lagoons and the ocean.
|]|/j!recent^years, sources of water
agllutionlike industrial waters from
ff^ctorifeshave been greatly reduced.
iHowevfer now, the majority of water •
dilution occurs from things like cars
||9aR|ng oil, fertilizers from farms and
^rclenSi failing septic tanks, pet
va^f ahd residential car washing into
ethe storni drains and into the ocean
j^afjd watenways.
"All these sources add up to a pollution
problem! But each of us can do small
%ings to help clean up our water and
fthat adds up to a pollution solution!
•it •
What's the problem with fertilizers
and pesticides?
Fertilizer isn't a problem—IF it's used
carefully. If you use too much
fertilizer or apply it at the wrong time,
it can easily wash off your lawn or
garden into storm 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.
% -
'"^"ProtBO*"'*
Storm Water HOTIine: 760-602-2799
stormwater@ci .carl sbad .ca.us
City of Carlsbad
1635 Faraday Avenue
Carlsbad CA 92008
www.ci .carl s bad .ca.u s
^^Printed on recycled paper
How can YOU help keep the environment clean?
'Having a clean environment is of
tajBDnmary importance for our health and
^•economy Clean watenvays provide
^^ommeri'ial opportunities, recreation,
^flsh habitat and add beauty to our
n^b^scape. YOU can help keep our
eeks, lagoons and ocean clean by
ipTying the following tips
.Danit blow or rake leayes and other
lard waste into the street or gutter.
•! Recycle yard waste or start your own
compost pile.
^Don't over irrigate. Use drip
Irrigation, soaker hoses or micro-
• spray system and water early in the
morning.
Uf you have a spray head sprinkler
, system, consider adjusting your
.watering method to a cycle and
^IK, Instead of watering for 15
liiinutes straight, break up the
session into 5 minute intervals
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 soii 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 infoimation
about dealing with specific pests iinj
plants. You may call the Master:
Gardener Hotline at 858-694-2860 or
check out their website at
www.masterqardenerssandieqo.crg. 'jJSgf^tl
The hotline is staffed Monday—Friday^^|
9 am—3 pm, by experienced gardeneis.5
who are available to answer specific
questions, information from Master
Gardeners is free to the public.
What you should know
before using Concrefe
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 Carlsbad 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 Usi
'«^Protec^°''
City of Carlsbad
1635 Faraday Avenue
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 ofthese 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, .^z^
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 YOU Can Do;
• 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 properly.
• 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 your contractor 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.
Mh-
A clean environment is
important to all of us!
INOT connected to sanitary sewer
W^tems and treatment plants? The
^^^primary purpose of storm drains is to
Blrry rainwater away from developed
6?eas to prevent flooding. Untreated
storm water and the pollutants it
carries flow directly into creeks,
lagoons and the ocean.
i^^^u- In recent years, sources of water
^•^1" pollution like industrial waters tom
.factories have been greatly reduced.
jiP!:However, now the majority of water
pollution occurs from things like cars
^"'leaking oil, fertilizers from farms and
•gardens, failing septic tanks, pet waste
land residential car washing into the
fgfofm drains and into the ocean and
^terways.
H m
4^All these sources add up to a pollution
l^problem! But each of us can do our
^rt to help clean up our water and
^at adds up to a pollution solution!
Car washing
courtesy of t'K
Quality Cons^^^^
cooperative ^^itii^M
between the[Wa^^pgr
State Departm^^^^
Ecology, l*^'"!^!^^^
the cities of |elljH^V*
Seattle and Tacom
There's no problem with washing your
~ 'car It's just how and where you do it.
Most soap contains phosphates and
^gg,, other chemicals that harm fish and
water quality. The soap, together with
fc dirt, metal and oil washed from
|pur car, flows into nearby storm
ffaihs which run directly into lakes,
ifiVe'rs or marine waters.
jJhe phosphates from the soap can
^cause excess algae to grow. Algae
look bad, smell bad, and harm water
^qualityi As algae decay, the process
"uses up oxygen in the water that fish
••heed.
How can YOU help keep the environment clean?
4
Having a clean environment
is;of primary importance for
- •> our health and economy.
, Clean waterways provide
commercial opportunities,
recreation, fish habitat and
adc beauty to our
landscape. YOU can help
j^^^keep our ocean, creeks and
Mq|n? clean by applying
)he„following tips:
'•'Use soap sparingly.
• Use a hose nozzle with a trigger to
sa^/e water.
• Pour your bucket of soapy water
down the sink when you're done, not
in the street.
Avoid using engine and wheel
cleaners or degreasers.
CTake your car to a commercial car
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.
Emerald Pointe
Storm Water Management Plan
Chapter 7 - SITE DESIGN BMPS
7.1 - Site Desiqn BIVIPs
Priority projects, such as the Emerald Pointe development, 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.
7.2 - Minimize Impervious Footprint
Methods of accomplishing this goal include:
- Constructing streets and sidewalks to the minimum widths necessary without
compromising public safety.
- Incorporating landscaped buffer areas between sidewalks and streets.
- Minimizing the number of residential street cul-de-sacs and incorporate
landscaped areas to reduce their impervious cover.
- Reduce overail lot imperviousness by promoting alternative driveway surfaces
and shared driveways that connect two or more homes together.
7.3 - Conserve Natural Areas
The proposed Emerald Pointe site is located on an approximate 18-acre lot.
Development of the lot will only affect 4.7 acres of the project site, approximately
26% of the overall project site.
As such, 13.3 acres (73%) ofthe project site will remain in current, natural
conditions.
7.4 - Permeable Pavements
Site design BMP alternatives such as pervious pavements were also considered for
use within the Emerald Pointe project site. However, the use of pervious pavements
has several disadvantages such as:
Many pavement engineers and contractors lack expertise with this
technology.
Porous pavement has a tendency to become clogged if improperly
installed or maintained.
Porous pavement has a high rate of failure.
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Emerald Pointe
Stomn Water Management Plan
Anaerobic conditions may develop in underlying soils if the soil is
unable to dry out between storm events. This may impede
microbiological decomposition.
Clay soils typically found within the project site are not sufficiently
permeable to convey storm water runoff - leading to possible soil
swelling and ultimately cracking ofthe pavement layer.
These factors listed influenced the decision to not include pervious pavements within
the site design.
7.5 - Minimize Directiv Connected Impervious Areas
Methods of accomplishing this goal include:
Draining rooftops into adjacent landscaping prior to discharging to
the storm drain.
7.6 - Slope & Channel Protection / Hillside Landscapinq
Methods of accomplishing this goal include:
Use of natural drainage systems to the maximum extent practicable.
Stabilize permanent channel crossings.
Planting native or drought tolerant vegetation on slopes.
Energy dissipaters, such as riprap, at the outlets of new storm
drains, culverts, conduits, or channels that enter unlined channels.
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Emerald Pointe
Storm Water Management Plan
CHAPTER 8 - TREATMENT CONTROL BMP DESIGN
CDS TREATMENT UNIT
8.1 - BMP Location
The proposed CDS treatment unit is located at the downstream end of the storm
drain within Sapphire Court, priorto the detention basin (see BMP Location Map on
the following page).
Other BMPs were investigated for the Emerald Pointe residential development such
as Filtration Basins, Grassy Swales & Curb Inlet Filters. However, the CDS (or an
approved, equivalent flow based treatment unit) hydrodynamic separators were the
most practicable for this project (refer to section 8.4).
8.2 - Determination of Desiqn Treatment Flows
The 85'^^ percentile design flow rates have been calculated using the Rational
Method. Required data for the Rational Method treatment flow detennination include
the following:
- Runoff Coefficient (C) = 0.52
- Rainfall Intensity (I) = 0.20 inches per hour
- Drainage area to treatment unit (A)
The following table summarizes the parameters used for determination of design
flows to the CDS unit.
DESIGN RUNOFF DETERMINATION SUMMARY TABLE
BMP Drainage Area
(acres)
Rainfall
Intensity
(inches/hour)
Runoff
Coefficient
85" Pet.
Design Flow
(cfs)
CDS Unit 4.9 0.2 0.52 0.5
8.3 - CDS Treatment Unit Selection
Calculations show that a CDS Model PMSU 20-15 unit would be required to treat
the design 85*^ percentile flow. This unit is an inline system and does not require the
construction of a special diversion box upstream of the treatment unit.
CDS UNIT SELECTION
Location Treatment Unit 85'" Percentile
Flow (cfs)
Treatment
Capacity (cfs)
Prior to Detention
Basin PMSU 20-15 0.5 0.7
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'O-
•4^
ao 120
\
-PROJECT BOUNDARY
cmr OF
SAN MARCOS
cnv OF ENQNrTAS
VICINITY MAP
NOT TO SCALE
//#i///^/////0
1.-V \\u\
Mi
LEGEND
I ————^—^——
WATERSHED BOUNDARY -• ^ WATER QUALITY UNIT
\ Wh'-' \"v./ti'a \ "ui.ii \
0 ^
1
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i!r\-
PREPARED BY:
HUNSAKER & ASSOCIATES
IAH aiistk INC
BMP LOCATION EXHIBIT FOR
EMERALD POINTE ESTATES
CITYOF CARLSBAD, CAUFORNIA
Emerald Pointe
Storm Water Management Plan
8.4 -BMP Unit Selection Discussion
8.4.1 Extended Detention Basins
Extended detention basins collect the first flush runoff volume and retain it in the
basin for a period of 24-48 hours.
85*^ percentile runoff volume, contained below the overflow elevation ofthe basin
riser, will be slowly discharged from the treatment control basin via low flow orifices
in the basin riser. After passing through the riser, an ouflet pipe will dewater the
basin and discharge runoff to the natural drainage course downstream.
Advantages
• Due to the simplicity of design, extended detention basins are relatively
easy and inexpensive to constmct and operate.
• Extended detentions basins can provide substanfial capture of
sediment and the toxics fraction associated with particulates.
• Widespread application with sufficient capture volume can provide
significant control of channel erosion and enlargement caused by
changes to flow frequency relationships resulting from the increase of
impervious cover in the watershed.
Limitations
• Limitation of the diameter of the orifice may not allow use of extended
detention in watersheds of less than 5 acres (would require an orifice
with a diameter of less than 0.5 inches that would be prone to
clogging).
• Dry extended detention ponds have only moderate pollutant removal
when compared to some other structural stormwater practices, and
they are relatively ineffective at removing soluble pollutants.
• Dry ponds can detract from the value of a home due to the adverse
aesthetics of dry, bare areas and inlet and ouflet structures.
Conclusion:
Due to the minimal footprint area available for the BMP treatment units, construction
of an extended detention basin is not a feasible option for the Emerald Pointe project
site. The detention basin proposed for peak flow mifigation does not have the
required volume to act as a dual purpose water quality basin, however the basin will
provide passive, secondary treatment for fiows draining to it.
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Emerald Pointe
Storm Water Management Plan
8.4.2 Vegetated Swale
Vegetated swales are open, shallow channels with vegetation covering the side
slopes and bottom that collect and slowly convey runoff through filtering by the
vegetation in the channel, filtering through a subsoil matrix, and/or infiltrafion into the
underlying soils. Swales can be natural or manmade. They trap particulate
pollutants (suspended solids and trace metals), promote infiltration, and reduce the
velocity of stormwater runoff. Vegetated swales can serve as part of a stormwater
drainage system and can replace curbs, gutters and stormwater systems.
Advantages
• If properly designed, vegetated, and operated, swales can serve as an
aesthetic, potenfially inexpensive urban development or roadway
drainage conveyance measure with significant collateral water quality
benefits.
Limitations
Can be difficult to avoid channelization.
May not be appropriate for industrial sites or locations where spills may
occur.
Grassed swales cannot treat a very large drainage area. Large areas
may be divided and treated using mulfiple swales.
A thick vegetative cover is needed for these practices to function
properly.
They are impractical in areas with steep topography.
They are not effective and may even erode when fiow velocifies are
high, ifthe grass cover is not properly maintained.
In some places, their use is restricted by law: many local municipalities
require curb and gutter systems in residenfial areas.
Swales are more susceptible to failure if not properly maintained than
other treatment BMPs.
Conclusion:
Due to the hilltop location of the proposed project site, the terrain did not lend itself
to a bio swale design (as grades were too steep to implement a swale).
As such, a vegetated swale is not a suitable treatment BMP for the project site. It
should be noted that the detention basin however will be vegetated in ultimate
condifions, offering passive treatment.
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Emerald Pointe
Storm Water Management Plan
8.4.3 Inflitration Basins
An infiltration basin is a shallow impoundment that is designed to infiltrate
stormwater. Infiltrafion basins use the natural filtering ability ofthe soil to remove
pollutants in stormwater runofi". Infiltration facilities store runoff until it gradually
exfiltrates through the soil and eventually into the water table. This practice has high
pollutant removal efficiency and can also help recharge groundwater, thus helping to
maintain low fiows in stream systems. Infiltrafion basins can be challenging to apply
on many sites, however, because of soils requirements. In addifion, some studies
have shown relafively high failure rates compared with other management practices.
Advantages
• Provides 100% reduction in the load discharged to surface waters.
• The principle benefit of infiltration basins is the approximafion of pre-
development hydrology during which a significant portion of the
average rainfall runoff is infiltrated and evaporated rather than flushed
direcfly to creeks.
• If the water quality volume is adequately sized, infiltration basins can
be useful for providing control of channel forming (erosion) and high
frequency (generally less than the 2-year) fiood events.
Limitations
• May not be appropriate for industrial sites or locations where spills may
occur.
• Infiltration basins require a minimum soil infiltrafion rate of 0.5
inches/hour, not appropriate at sites with Hydrologic Soil Types C and
D.
• Infiltrafion rates exceeding 2.4 inches/hour, the mnoff should be
treated prior to infiltration to protect groundwater quality.
• Not suitable on fill sites or steep slopes.
• Risk of groundwater contamination in very coarse soils.
• Upstream drainage area must be completely stabilized before
construction.
• Difficult to restore funcfioning of infiltrafion basins once clogged.
Conclusion:
Due to the type D clay soils typically located in the region and minimal project site
area, infiltrafion basins are not a feasible option for the Emerald Pointe project site.
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Emerald Pointe
Storm Water Management Plan
8.4.4 WetPonds
Wet ponds are constructed basins that have a permanent pool of water throughout
the year (or at least throughout the wet season) and differ from constructed weflands
primarily in having a greater average'depth. Ponds treat incoming stormwater runoff
by settling and biological uptake. The primary removal mechanism is settling as
stormwater runoff resides in this pool, but pollutant uptake, particularly of nutrients,
also occurs to some degree through biological activity in the pond. Wet ponds are
among the most widely used stormwater practices. While there are several different
versions ofthe wet pond design, the most common modificafion is the extended
detention wet pond, where storage is provided above the permanent pool in orderto
detain stonnwater mnoff and promote settling.
Advantages
• If properly designed, constructed and maintained, wet basins can
provide substantial aesthetic/recreational value and wildlife and
wefiand habitat.
• Ponds are often viewed as a public amenity when integrated with a
park setting.
• Due to the presence of the permanent wet pool, properly designed and
maintained wet basins can provide significant water quality
improvements across a relatively broad spectrum of constituents
including dissolved nutrients.
• Widespread application with sufficient capture volume can provide
significant control of channel erosion and enlargement caused by
changes to fiow frequency relationships resulfing from the increase of
impervious cover in a watershed.
Limitations
• Some concern about safety when constructed where there is public
access.
• Mosquito and midge breeding is likely to occur in ponds.
• Cannot be placed on steep unstable slopes.
• Need for base flow or supplemental water if water level is to be
maintained.
• Require a relatively large footprint.
• Depending on volume and depth, pond designs may require approval
from the State Division of Safety of Dams.
Conclusion:
Due to the minimal footprint area available forthe BMP treatment units and proximity
to residences (vector issues) wet ponds are not a feasible option for the Emerald
Pointe project site.
DE:de H:\REPORTS\2339M9lSWMP03.doc
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Emerald Pointe
Storm Water Management Plan
8.4.5 Media Filters
Stormwater media filters are usually two-chambered including a pre-treatment
setfiing basin and a filter bed filled with sand or other absorpfive filtering media. As
stormwater fiows into the first chamber, large particles settle out, and then finer
particles and other pollutants are removed as stormwater flows through the flitering
media in the second chamber.
Advantages
Limitations
Relatively high pollutant removal, especially for sediment and
associated pollutants.
Widespread application with sufficient capture volume can provide
significant control of channel erosion and enlargement caused by
changes to fiow frequency relafionships resulfing from the increase of
impervious cover in a watershed.
• More expensive to constmct than many other BMP's.
• May require more maintenance than some other BMP's depending
upon the sizing of the filter bed.
• Generally require more hydraulic head to operate properly (min 4 feet).
• High solids loads will cause the filter to clog.
• Work best for relatively small, impervious watersheds.
• Filters in residential areas can present aesthetic and safety problems if
constmcted with vertical concrete walls.
• Certain designs maintain permanent sources of standing water where
mosquito's and midge breeding is likely to occur.
Conclusion:
Due to the minimal footprint area available forthe BMP treatment units, media filters
are not a feasible option for the Emerald Pointe project site.
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Emerald Pointe
Storm Water Management Plan
8.4.6 Drainaqe Inserts
Drainage inserts are manufactured filters or fabric placed in a drop inlet to remove
sediment and debris. There are a multitude of inserts of various shapes and
configurafions, typically falling to one of three different groups: socks, boxes and
trays. The sock consists of a fabric, usually constructed of polypropylene. The
fabric may be attached to a frame or the grate of the inlet holds the sock. Socks are
meant for vertical (drop) inlets. Boxes are constructed of plasfic or wire mesh.
Typically a polypropylene "bag" is placed in the wire mesh box. The bag takes form
of the box. Most box products are one box; that is, the setting area and filtrafion
through media occur in the same box. Some products consist of one or more trays
and mesh grates. The trays may hold difl'erent types of media. Filtrafion media vary
by manufacturer. Types include polypropylene, porous polymer, treated cellulose
and activated carbon.
Advantages
• Does not require additional space as inserts as the drain inserts are
already a component ofthe standard drainage systems.
• Easy access for inspection and maintenance.
• As there is no standing water, there is little concern for mosquito
breeding.
• A relatively inexpensive retrofit opfion.
Limitations
• Performance is likely significanfiy less than treatment systems that are
located at the end ofthe drainage system such as ponds and vaults.
• Usually not suited for large areas or areas with trash or leaves that can
plug the insert.
Conclusion:
The proposed road servicing the Emerald Pointe project site is to be a public road.
Per the City of Carlsbad, no inlet filters are permitted in public roadways.
Hence, drainage inserts are not a feasible treatment solufion.
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Emerald Pointe
Storm Water Management Plan
8.4.7 Hydrodvnamic Separator Svstems
Hydrodynamic separators are fiow-through structures with a setfiing or separation
unit to remove sediments and other pollutants that are widely used in storm water
treatment. No outside power source is required, because the energy of the fiowing
water allows the sediments to efficienfiy separate. Depending on the type of unit,
this separafion may be by means of swirl action or indirect filtrafion. Variations of
this unit have been designed to meet specific needs. Hydrodynamic separators are
most effective where the materials to be removed from mnoff are heavy particulates
- which can be settled - or floatables -which can be captured, rather than solids with
poor settleability or dissolved pollutants. In addition to the standard units, some
vendors offer supplemental features to reduce the velocity ofthe flow entering the
system. This increases the efficiency ofthe unit by allowing more sediments to
settle out.
Advantages
• May provide the desired performance in less space and therefore less
cost.
• May be more cost-effective pre-treatment devices than tradifional wet
or dry basins.
• Mosquito control may be less of an issue than with traditional wet
basins.
Limitations
• As some of the systems have standing water that remains between
storms, there is concern about mosquito breeding.
• It is likely that vortex separators are not as effective as wet vaults at
removing fine sediments, on the order 50 to 100 microns in diameter
and less.
• The area served is limited by the capacity of the largest models.
• As the products come in standard sizes, the facilifies will be oversized
in many cases relative to the design treatment storm, increasing cost.
• The non-steady flows of stonnwater decreases the efficiency of vortex
separators from what may be estimated or determined from testing
under constant flow.
• Do not remove dissolved pollutants.
• A loss of dissolved pollutants may occur as accumulated organic
matter (e.g., leaves) decomposes in the units.
Conclusion
Due to the minimal footprint area available forthe BMP treatment units,
hydrodynamic separators are the most feasible opfion for the Emerald Pointe project
site.
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W.O.2339-19 8/18/2005 10:19AM
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 Emerald Pointe |
Work Order 2339-19 1
Jurisdiction City of Carslbad |
BMP Location Drain System Prior to Detention Basin
Developed Drainage Area = 4.9 acres
Natural Drainage Area = 0.0 acres
Total Drainage Area to BMP = 4.9 acres
Dev. Area Percent Impervious = 30 %
Overail Percent Impervious = 30 %
Dev. Area Runoff Coefficient = 0.52
Nat. Area Runoff Coefficient =
Runoff Coefficient = 0.52
Time of Concentration = 10.1 minutes
(from Drainage Study)
RATIONAL METHOD RESULTS
Q = CIA where Q = 85th Percentile Peak Flow (cfs)
C = Runoff Coefficient
I = Rainfall Intensity (0.2 inch/hour per RWQCB mandate)
A = Drainage Area (acres)
Using the Total Drainage Area:
C =
I =
A =
Q =
0.52
0.2 inch/hour
4.9 acres
0.51 cfs
CDS Technologies, Inc.,
CDS TECHNOLOGY
Continuous Deflective Separation (CDS®) is an innovative technology that is revolutionizing
liquids/solids separation in storm water and combined sewer overflow industry. The technology
accomplishes high efficiency separation of settleable particulate matter and virtually 100 percent
capture of floatable material. Its application is ided to any situation where removal of gross
pollutants is desired.
The primary features of the CDS* system are:
EFFECTIVE: capturing more than 95% of soUd pollutants
NON-BLOCKBSG: imique design takes advantage of indirect filtration and properly
proportioned hydraulic forces that virtually makes the unit imblockable.
NON-MECHANICAL: the CDS® unit has no moving parts and requires no supporting
mechanical package to affect soHd separation firom stonnwater flows.
LOW MAINTENANCE COSTS: because the system has no moving parts and is
constructed of durable materials.
COMPACT AND FLEXIBLE: design and size flexibility enable units embodying the
CDS® technology to be used in a variety of configurations and in limited spaces.
HIGH FLOW EFFECTIVENESS: the technology remains highly effective across a
broad spectrum of flow ranges, with hydraulic loadings exceeding 80 gallons per square
foot of plan surface area.
ASSURED POLLUTANT CAPTURE: all materials captured are retained during high
flow conditions.
SAFE AND EASY POLLUTANT REMOVAL: extraction methods allow safe and
easy removal of pollutants without manual handling.
COST EFFECTIVE: total costs are lower per mass material captured compared to
existing available altematives.
CDS® offers small separation tmits to process flows of 1 cubic foot per second (cfs) or less. The
smallest tmit is ideal for small drainage areas such as parking lots. CDS® offers a range of
premanufactured vmits sized to process typical drainage flows from new and existing urban
developments. CDS® also offers design services for larger cast in place imits to meet the
treatment requirements of more significant runoff flows generated by larger drainage areas. To
date, CDS® can design units capable of processing up to 300 cfs.
CDS® units are available in precast reinforced concrete modules for all applications processing
flows up to 64 cubic feet per second. For apphcations requiring larger flow processing, units are
designed complete with construction specifications for cast in place construction.
Units can be readily adapted to pipelines, box culverts, and open channels with varying
geometric shapes.
CDS Technologies, Inc.,
CDS Technologies® includes multiple "Manhole" units in its Model lineup. These are uniquely
designed for in line use on small pipelines to 36" in diameter, where desired process flows are 6
cfs or less. The CDS® technology including its high flow bypass weir is neatly packaged inside
of standard manhole stacks from 4' to 8' diameter. These particular units have been specially
configured to allow an effective oil baffle system to be installed increasing the capacity to hold
greater quantities of free oil should the need arise. For piping larger than 36", CDS
Technologies® recommends using a standard beside Une unit with a diversion weir box designed
specifically to accommodate the larger pipe.
HYDROLOGIC ANALYSIS
In storm water apphcations, an analysis of the catchment in terms of its size, topography and
land use will provide infonnation for determining the flow to be expected for various retum
periods. Based on the poUutograph (if known), a CDS® imit can be designed for the flow that
mobilizes the gross pollution in the catchment. Since there are variations in catchment response
due to region, land use and topography, CDS Technologies® recommends the selection of a
design flow for treatment having a retum period between three months and one year.
Typically, it is not necessary to design CDS® units to process a conveyance system's design flow
in order to achieve a very high level of pollutant removal. An effective design recognizes that
the vast majority of pollutants are mobilized in flows that are well below the "design capacity"
for the conveyance facility. Field evaluations to determine pollutant mobihzation flows ia
combined sewer overflows have detennined that the pollutants are released and mobihzed with
flows having retum periods of 3 to 6 months.
The majority of pollutants in storm water are mobilized in similar events.
It is well recogmzed that even though the three-month to one-year event is well below the
average system's capacity, the actual volume that is generated in the catchment from events
smaller than these is about 95% of the total annual volume generated by the catchment. It is
worth noting that a VERY small quantity of solid pollution actually travels in these higher flows,
therefore, from a practical perspective, designing for the three month to one year event is
virtually designing to treat nearly 100% of the runoff that will be transporting pollution.
HYDRAULIC DESIGN
Every CDS® installation requires a detailed hydraulic analysis to ensure the final installation will
properly perfonn to effect optimum sohds separation without blocking the separation screen.
Proper design requires knowledge of the conveyance system, and its perfoimance through its
design flow range and the hydraulic performance of the selected CDS® unit through the same
flow range.
After the CDS® design flow is detennined, the appropriate standard model can be selected from
TABLE A on Page 6. Each model on Page 6 identifies a reference PAGE on which additional,
detailed infonnation about the selected model is available.
The design flow is diverted into the CDS® unit by constmcting a diversion weir across the flow
path of the conveyance facility, the approximate height of the weir can be estabhshed by
detennining the hydrauhc grade line (HGLd/s) in the system immediately downstream of the
CDS® unit and adding the CDS HEAD LOSS (hcds) identified on the PAGE referenced for the
unit selected. The sum of the above represents the HGLu/s required at the entrance to the
diversion weir.
CDS Technologies, Inc.,
HGLu/s~ HGLd/s + hcds
The height ofthe CDS diversion weir can then be detennined to be:
Weir Height= HGLu/s - Invert Level
Maximum Water Surface or HGL Upstream of the CDS Installation
The head loss identified in the Tables on Pages 9-13 represents the ideal hydraulic installation.
The head required to operate a CDS® unit at the CDS® design flow does not control the
maximum rise in water surface upstream of the CDS® unit. At the CDS® design flow; the HGL
is at the top of the diversion weir. For most installations this is well below finished grade.
The maximum increase in water surface occurs when the conveyance system reaches its design
flow. When this flow occurs, the actual flow through the CDS® may be altered, with the balance
of flow passing over the diversion weir. Based on laboratory measurements and analysis, it has
been established that the actual head loss under system design flow will not exceed 1.3 x V^/2g in
a well-designed diversion structure, where V is the design flow velocity in the system when tiie
pipe is flowing.
To assure passage of system design flow through the weir area, the unobstmcted area provided
above the weir must be equal to or greater than the cross sectional area for the pipeline entering
the weir box.
In recognition of the potential that the CDS® may fill up with captured material and lose its
conveyance capacity, the hydrauhc evaluation must include analysis under this scenario to
understand the potential for flooding upstream.
The effects of the diversion weir primarily influence the rise m the water surface under the
conveyance system design flow. The actual effect can be controlled by properly designing the
weir length and clear height above the weir to take advantage of the potential energy that can be
developed in the system without inducing flooding upstream.
CDS Technologies recommends that the head loss across the weir be limited to no more than 1.4
times the CDS® unit headloss at its design flow to ensure that it continues to operate properly
during the conveyance system's peak flows.
An example of the hydraulic design process is provided under Appendix B.
STRUCTURAL DESIGN
All CDS® units are designed to withstand equivalent fluid pressures that the unit may experience
during its hfe. The water table at the installation site should be known, or a conservative
estimate will be made on the maximum expected. Units are analyzed assimiing that it is empty
and full buoyant force is actiag on it.
The foundation material needs to be adequate to support the stmcture's weight without allowing
differential settlement.
The materials for manufacture of precast units are fully described in Appendix D
"Product & Installation Specifications" ofthis Manual.
All cast in place concrete designs are based on using stmctural concrete with minimum ultimate
strength of 4,000 poimds per square inch (psi), with steel reinforcement having a minimum
ultimate yield strength of 60(10^) psi. Concrete and steel reinforcement are as noted in Appendix
D, vmless otherwise specified for site-specific conditions.
CDS Technologies, Inc.,
CDS MODEL DESIGNATION
CDS® units are identified by their process screen diameter. They are also identified by its
apphcation with "SW" designating "Stonn Water", "SU" designating "Stonn Unit" "CS"
designating "Combined Sewer".
Model famihes are designated by the letter "P", PM, or "C", designating, "Precast", Precast
Manhole, or "Cast" in place, along with the apphcation letters and a pair of number designations
such as PSWXX_XX. The first XX represents the separation screen diameter m feet; the second
_XX designates the height of the separation screen in feet (see TABLE A on page 7 for further
description of unit designations). General manufacturing details and weights are included for the
various models imder Appendix A.
CDS VAIUABLE COMPONENTS
The variable components in a CDS® unit within a model family are the screen height, the screen
aperture (opening), sump diameter and depth, and ^e of cover.
Screen Height
The screen height is important within a model family because it controls the design flow that can
pass through the unit without clogging the screen. In general, screen heights can vary between
60 to 150 percent ofthe screen diameter.
Screen Aperture
The standard screen for storm water apphcations is 4700 microns (.185 inches) for coarse
screening. A 2400 micron (0.095) is available where there is a need to separate finer sediments
than those removed by the 4700 micron screen.
The screen aperture (opening) is important because it sets the capture parameter for settleable
pollutants. In general, a CDS® unit with a 4700 micron screen will capture 93% of all particles
as small as 1/3 the short dimension of the screen opening. This has been detennined through
extensive pilot work performed by Tony Wong, PhD, Monash University. Tony Wong's
technical, paper, fiilly describing the hydrauhc basis on which CDS® achieve effective sohd
separation, is readily available.
Sump
The sump is another variable that can be adjusted for site-specific conditions and utihty
preference. Each Model Family is equipped with a standard sump. However, the diameter and
depth can be adjusted to meet site-specific requirements.
CDS® Covers
Covers can be provided with each CDS unit. A pedestrian traffic cover is standard with each
unit. The cover is designed with an inspection/cleanout hatch. The entire cover may be removed
to facihtate cleanout.
If required, a traffic bearing cover will be designed, fabricated and fumished. If a traffic bearing
cover is desired, the utihty should so advise CDS Technologies® to include it ia the quote.
CDS Technologies, Inc.,
CDS® SUMP CLEANOUT
Sump cleanout is a critical component of a successfiil CDS® operation. The sump is the
depository for all settleable pollutants captured by CDS®. The methods for maintenance and
cleanout are generally specific, dependent on the preferences of a given agency. The standard
model is provided with a standard sump that can be cleaned by methods selected by the utihty.
At the utiUty's discretion, a unit can be cleaned using a vacuum truck or a small clamshell
bucket, or a basket can be provided to fit a standard sump. If the utility chooses to use a basket,
it should advise CDS® Technologies so it can be included in a quote.
CDS® MAINTENANCE
CDS* maintenance can be site and drainage area specific. The unit should be inspected
periodically to assure its condition to handle anticipated runoff. If pollutant loadings are known,
then a preventive maintenance schedule can be developed based on runoff volumes processed.
Unfortunately, that is seldom the case.
CDS Technologies® recommends the following for Storm Water Apphcations:
New Installation - Check the condition ofthe unit after every runoff event for the first 30 days.
Checking includes a visual inspection to ascertain that the unit is functioning properly and
measuring the amount of deposition that has occurred in the unit. This can be done with a "dip
stick" that is calibrated so the depth of deposition can be tracked. Based on the behavior ofthe
unit relative to storm events, inspections can be scheduled on projections using storm events vs.
pollutant buildup.
Ongoing Operation - During the wet season, the unit should be inspected at least once every
thirty days. The floatables should be removed and the sump cleaned when the sump is above
85% fiill. At least once a year, the unit should be pumped down and the screen carefully
inspected for damage and to ensure that it is properly fastened. Ideally, the screen should be
power washed for the inspection.
Maintenance Cvcle - The standard maintenance cycle for a CDS device is a minimum of once a
year. Mauitenance may be required more frequently depending on the pollutant load in the
drainage. However, if the actual pollutant load is properly estimated, the sump capacity can be
adjusted to hold an annual pollutant load.
The CDS® unit is a confined space. Properly trained people equipped with required safety gear
will be required to enter the unit to perform the detailed inspection.
TABLE — A
MODEL PERFORMANCE CAPABILITY
MODEL DESIGN FLOW RATE REFERENCE
NUMBER CFS MGD M Vsec PAGE
0-7.. 0.5 .02
PMSU20_15_4 0.7 0.5 .62 ' '
PMSU20_15 0I7 0.5 " .02 INUNE PMSU20_20 0.7 .03 INUNE PMSU20_25
PMSU30_20
1.6
2,0
1.0
1.3
.- -.05
^06_ 9
PMS_U30_30 3.0... 1.9 .08
PMSU40_30 4.5 3.0 .13
PMSU"40_40 6.0 3.9 .17 "
PSWC30_30 3.0 1.9 .08
PSWC40_40 6.0 3.9 .17 PREC PSWC56_40
PSWC56_53
9.0
14
5.8
9.0
.25
.40
PSWC56_68 ~19 12 T54 10
u PSWC56_78 25 16 '.71" FUN PSW36_30 3.0 1.9 .08
0 PSW50_42 9.0 5.8 .25
PSW50_50 11 7.1 .31
PSW70_70 26 17 .74
PSW100_60 30 19 .85 11
PSW100_80 50 32 1.4
PSW 100 100 64 41 1.8
Ul CSW150_134 148 • 95 4.2
12
^ Q. CSW200_164 270 174 7.6 12
Z CSW240_160 300 194 8.5
Icfs = 0.64512 MGD or 1MGD = 1.55 cfs
MODEL DESIGNATIONS
— Screen Diameter
PMSU= Precast Manhole Storm Water Unit
PSWC= Precast Storm Water Concentric
PSW = Precast Storm Water
CSW =Cast in Place Storm Water
Screen Height
•J
X X _ X X (L or ,R)*
L. Feet
Tenths of a Foot
* L or R designates the location of the CDS "when looking downstream.
(L)eft represents being placed on the Left side of the stormdrain,
(R)ight is placed on the right side.
Tenths of a Foot
- Feet
GENERAL DESCRIPTION OF UNIT
HIGH FLOW
BYPASS \
CONVEYANCE
CONDUIT
SEPARATION
SCREEN
SEPARATION
CHAMBER
•WEIR BOX-
INLET
DIVERSION
WEIR
FLOW k CONVEYANCE CONDUIT
OUTLET CONTROL WEIR
CDS OUTLET
PLAN VIEW
(RIGHT HAND UNIT)
GENERAL DESCRIPTION OF UNIT
INLET DIVERSION WEIR
EXISTING GRADE HIGH FLOW BYPASS
CONVEYANCE
CONDUIT
CONVEYANCE
CONDUIT
SEPARATION
CHAMBER
SEPARATION
SCREEN
SUMP
ELEVATION
PRECAST MANHOLE MODELS
PROCESSES FLOWS 0.75 TO 6.5 CFS
VARIES
7
• FLDW
A = FOOT PRINT DIAMETER
D = DEPTH BELOW PIPE INVERT, VARIES -'A'-
, PRECAST
MODEL
NUMBER
••TREATMENT
DESIGN
FLOW RATE
***DESIGN
HEAD LOSS
@ DESIGN
TREATMENT
FLOW RATE
SCREEN
DIAyHT.
DEPTH
BELOW
PIPE
INVERT
"D"
FOOT
PRINT
DIAMETER
"A"
, PRECAST
MODEL
NUMBER cfs MGD m 3/sec ft. m ft. ft. •ft.
PMIU20_15 0.7 0.5 0.02 0.45 0.11 2/1.5 4.2 4.8
PMSU20_15_4 0.7 0.5 0.02 0.35 0.11 2/1.5 3.5 - 4 4.8
PMSU20_15 0.7 0.5 0.02 0.35 0.11 2/1.5 5.1 . 6.0
PMSU20_20 1.1 0.7 0.03 0.48 0.15 2/2.0 5.7 6.0
PMSU20_25 1.6 1.0 0.05 0.62 0.19 2/2.5 6.0 6.0
PMSU30_20 2.0 1.3 0.06 0.65 0.20 3/2.0 6.2 ' 7.2
PMSU30_30 3.0 1.9 0.08 0.70 0.21 3/2.8 7.2 7.2
PMSU40_30 4.5 3.0 0.13 0.85 0.26 4/3.0 8.6 9.5
PMSU40_40 6.0 3.9 0.17 0.88 0.27 4/4.0 9.6 9.5
^Standard screen opening is 4700 microns (.185 in.). Screens also
available in 2400 microns (.095 in.).
**This is the minimum flow that will receive treatment before bypass
is allowed. These precast manhole units are capable of by passing
the Q25 year event. CDS Engineers ore readily available to provide
hydraulic consultations on all applications.
***The headloss during a bypass event is a function of the velocity
head. The typical coefficient .of headioss "K
1.3 to 2.5
CDS ranges from
TYPICAL / GENERIC
INSTALLATION
60" LD. CONC.
MH RISER, 6"
THICK WALLS
• CfYP.)
ELEVATION VIEW
(SEE SHEET 3)
A FLOW
I
XX 0
PIPE INLET
OIL BAFFLE.
MODEL A FOR PIPES TO 18"*
MODEL B FOR PIPES TO 3O"0
ELEVATION VIEW
(SEE SHEET 3)
A _C PIPE AND
MH RISER
I
XX" 0
PIPE OLTTLET
RBERGLASS INLET
AND CYUNDER
24"0 MH COVERS tc
FRAMES (2)- OTHER
HATCHES AVAILABLE
tJQIL:
THE INTERNAL COMPONENTS ARE SHOWN IN THE RIGHT-HAND
CONRGURATION-THESE COMPONENTS MAY BE FURNISHED IN THE
MIRROR IMAGE TO THAT SHOWN (LEFT-HAND CONRGURATION).
CDS MODEL PMSU20_15, 0.7 CFS CAPACITY
STORM WATER TREATMENT UNIT
^^1^ TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE
12/3/01
SCALE
^^1^ TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE J.S.F. SHEET
2 ^^1^ TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE APPROV.
SHEET
2
TYPICAL / GENERIC
INSTALLATION
SHOWN IN RIGHT-HAND
CONFIGURATION
ACCESS RISER.
5-0" LD.
ATTACH SIDE AND BOTTOM
FLANGES TO WALL OF MH
RISER USING ANCHOR BOLTS
(6 MIN), SUPPUED BY CDS.
FLOW
XX"0
PIPE INLET
ATTACH SCREEN TO SLAB
USING 4 ANCHOR BOLTS,
SUPPUED BY CDS.
25"* SEPARATION SCREEN,
SEE NOTE #2
CENTER OF
MH RISER
SECTIONS
OIL BAFFLE .
(OPTIONAL)
OPENINGS PROVIDED DURING
PRECASTING FOR
PIPE INLET AND OUTLET
XX"0
PIPE OUTLET
CENTER OF SCREEN,
21"* SUMP OPENING
STAINLESS STEEL
SEPARATION PLATE
NOTES: -
1. THE INTERNAL COMPONENTS ARE SHOWN IN THE RIGHT-HAND
CONHGURATION-THESE COMPONENTS MAY BE FURNISHED IN THE
MIRROR IMAGE TO THAT SHOWN (LEFT-HAND CONRGURATION).
2. FOR PROPER INSTALLATION, GREEN FLANGE ON SCREEN FACES UP
FOR RIGHT-HAND INSTALLATION. RED FLANGE UP FOR LEFT-HAND
ORIENTED UNITS.
CDS MODEL PMSU20_15, 0.7 CFS CAPACITY
STORM WATER TREATMENT UNIT
'TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE
DATE 12/3/01
DRAWN J.S.F.
APPROV.
SCALE
1"=2'
SHEET
TYPICAL / GENERIC
INSTALLATION
FINISHED GRAOE
EL- XX.XX'±
24' * COVERS & FRAMES (2),
TYP. - OTHER HATCH
READILY AVAILABLE.
RISER SECTIONS
C SEPARATION
SECTIONS
11 CA. STAINLESS STEEL
SFPARATIQN PLATE
-24"*
-15"*
PLAN VIEW
SCALE: r=2'
CDS MODEL PMSU20_15, 0.7 CFS CAPACITY
STORM WATER TREATMENT UNIT
PROJECT NAME
CITY, STATE
12/3/01 SCALE
r-2.5'
^^ggF TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE J.S.F. SHEa
4 ^^ggF TECHNOLOGIES
PATENTED
PROJECT NAME
CITY, STATE APPROV.
SHEa
4
C SEPARATION
& RISER
SECTIONS
5-1" ±
DEPTH
BELOW
PIPE
INVERT
CTYPICAL)
CONSTRUCTTON NOTES:
1 APPLY BUTYL MASTIC AND/OR GROUT TO SEAL JOINTS OF MANHOLE STRUCTURE. APPLY LOAD TO MASTIC SEAL IN
JOINTS OF MH SECTIONS TO COMPRESS SEALANT IF NECESSARY. UNIT MUST BE WATER TIGHT, HOLDING WATER UP
TO FLOWUNE INVERT (MINIMUM).
IF SEPARATION SLAB IS NON-INTEGRAL TO THE SEPARATION SECTION OF THE UNH:. SET AND VERIFY TOP ELEVATION
BEFORE PLACING MORE PRECAST COMPONENTS OR BACKHLUNG. ENSURE 24" FROM TOP OF SEPARATION SLAB
TO PIPE INVERT.
3. GROUT PIPE CONNECTIONS TO SEAL JOINT.
4 SET BOTTOM OF OIL BAFFLE 14" ABOVE SEPARATION SLAB FLOOR; DRILL AND INSERLA MINIMUM OF TEN (10)
3/8" X 3 3/4" SS EXPANSION BOLTS O 12" O.C. EQUALLY SPACED TO SECURE FIBERGLASS OIL BAFFLE FLANGE
TO RISER WALL-(HARDWARE SUPPUED BY CDS TECHNOLOGIES).
5 FASTEN RBERGLASS CYLINDER/INLET TO SCREEN ASSEMBLY USING FOUR (4) SETS OF 1' x 1 SS HEX HEAD
' BOLTS W/ NUTS AND WASHERS-(HARDWARE SUPPUED BY CDS TECHNOLOGIES). IN THE LEFT-HANDED
CONFIGURATION THE "RED" COLORED FLANGE ON THE SCREEN CYUNDER SHALL FACE UP. IN THE RIGHT-HANDED
CONFIGURATION, THE "GREEN" COLORED FLANGE SHALL FACE UP.
CENTER SCREEN ASSEMBLY OVER SUMP OPENING AND POSITION FIBERGL\SS INLET AGAINST RISER WALL; DRILL AND
INSERT A MINIMUM OF SIX (6) 3/B" x 3 3/4" SS EXPANSION BOLTS EQUALLY SPACED TO SECURE RBERGLASS
INLET FLANGE TO RISER WALL-(HARDWARE SUPPUED BY CDS TECHNOLOGIES).
VERlPi' THAT SCREEN ASSEMBLY IS CENTERED OVER SUMP ACCESS HOLE AND ADJUST IF NECESSARY; DRILL AND
INSERT FOUR (4) 3/8" x 3 3/4" SS EXPANSION BOLTS TO FASTEN SCREEN ASSEMBLY TO SEPARATION SLAB-
(HARDWARE SUPPUED BY CDS TECHNOLOGIES).
PMSU20_15
CONSTRUCTION
DATE 12/3/01
SCALE
N.TS. PMSU20_15
CONSTRUCTION DRAWN J.S.F. SHEET
5 ^^jjgF TECHNOLOGIES
PATENTED
NOTES APPROV.
SHEET
5
Emerald Pointe
Storm Water Management Plan
9.2 - Agreements (Mechanisms to Assure Maintenance)
There is a single flow based treatnnent unit associated with the Emerald Pointe
project site for storm water quality treatment. Storm water quality units fall within
maintenance category two based onthe County's Guidelines forthe Stormwater
Maintenance Plan. 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. Security
to fund "backup" maintenance which would be performed by the City in the event
that the HOA's maintenance is inadequate is required.
The County of San Diego 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 of the Home Owners Association at the time of inception and by
the contractor during construction ofthe development.
Additionally, a BMP Maintenance Agreement with Easement and Covenant will be
entered into with the city which will function in three ways. This agreement will
commit the land to being used only for purposes ofthe BMP; The agreement will
include an agreement by the landowner to maintain the facilities in accordance with
the SMP (which would be passed on to future purchasers or successors ofthe
landowner as a covenant); This agreement will include an easement giving the City
the right to enter onto the land and any adjacent land needed for access to maintain
the BMPs.
The Developer must provide the City with Security to back up the maintenance
agreement which would remain in-place for an interim period of five years. The
amount of the security shall equal the estimated cost of two years of maintenance
activities. The security can be a Cash Deposit, Letter of Credit or other form
acceptable to the City.
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W.O.2339-19 8/16/2005 10:19AM
Emerald Pointe
Storm Water Management Plan
Chapter 9 - FISCAL RESOURCES
9.1 - 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 Emerald Pointe development.
»»»»»»»Increased risk, complexity, cost or other maintenance factors»»»»»»»>»
(Private Responsibility) (Public Responsibility)
First Category Second Category Third Category Fourth Category
Importance of
Maintenance
Minimal
concern;
inherent in
BMP or
property
stewardship
Need to mal<;e sure
private owners
maintain, and
provide County
ability to step in &
perform
maintenance
Warrants Flood
Control Dist. (FCD)
assuming
responsibility, with
funding related to
project
Broader public
responsibility for
maintenance and
funding (beyond
project)
Tvoical BMPs Biofilter (Grass
swale, grass
strip, vegetated
buffer);
Infiltration
basin/trench
[First cat. plus:]
Minor wetland swale;
Small detention
basin; Single storm
drain insert / Oil-
water separator /
Catch basin insert &
screen
[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
Mechanisms 1. Stormwater Ordinance requirement
[section 67.819(a)&(b)], with code
enforcement
2. Nuisance abatement with costs
charged back to property owner
, 3. Condition in ongoing permit such as
a Major Use Permit (if project has
MUP)
'4. Notice to new purchasers
[67.819(e)]
5. Subdivision public report "white
papers" to include notice of
maintenance responsibility
1. Dedication to FCD.
2. Formation of
benefit area
3. FCD maintenance
documentation
1. Dedication to
FCD or
County.
2. FCD/County
maintenance
documentation
Mechanisms
6. Recorded
easement
agreement
w/covenant
binding on
successors
1. Dedication to FCD.
2. Formation of
benefit area
3. FCD maintenance
documentation
1. Dedication to
FCD or
County.
2. FCD/County
maintenance
documentation
Funding
Source(s)
None
necessary
Security (Cash
deposit, Letter of
Credit, or other
acceptable to County)
for interim period.
Agreement for
; security to contain
provisions for release
or refund, if not used.
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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W.O.2339-19 8/16/2005 10:19 AM