HomeMy WebLinkAboutSDP 03-12; WATER QUALITY TECHNICAL REPORT; 2003-08-12WATER DUALITY
TECHNICAL REPORT
PREPARED FOR:
CARLSBAD VILLAGE DRIVE INVESTORS, LLC
1241 Carlsbad Village Drive
Suite 100
Carlsbad, California 92008
(760) 434-1400
PREPARED BY:
BUCCOLA ENGINEERING, INC.
3142 Vista Way'
Suite 301
Oceanside, California 92056
(760) 721-2000
August 12, 2003
172-1
TABLE OF CONTENTS
1.0 Purpose
2.0 Introduction
3.0 Determination of Applicable Storm Water BMP Requirements
4.0 Sight Description
4.1 Existing Drainage Patterns and Facilities
4.2 Proposed Site Development Drainage Patterns and Facilities
5.0 Criteria for Identification of Pollutants of Concern
5.1 Identification of Pollutants From the Project Area
5.2 Identification of Receiving Waters
5.3 Identification of 303(d) Impaired Waters
5.4 Identification of Pollutants of Concern
6.0 Criteria for Identification of Conditions of Concern
6.1 Summary Evaluation of the Preliminary Hydrology Study
6.2 Identification of Conditions of Concern
7.0 Establishing Storm Water Best Management Practices (BMPs)
7.1 Site Design BMPs
7.2 Source Control BMPs
7.3 BMPs for Individual Priority Project Categories
7.4 Selection of Treatment Control BMPs
7.5 Numeric Sizing Design
7.6 Location of Treatment Control BMPs
7.7 Infiltration BMPs - Use and Restrictions
7.8 Wavier of Treatment Control BMP Requirements
8.0 Storm Water BMP Maintenance
8.1 Maintenance Mechanisms
8.2 Verification Mechanisms
8.3 Maintenance Requirements
9.0 Summary and Conclusion
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccoa Engineering, Inc.
Carlsbad Village Drive Investors, LLC
TABLE OF CONTENTS (continued)
10.0 Figures
I Vicinity Map
2 USGS Location Map
3 85th Percentile Precipitation Isopluvial Map
4 Existing Site Condition & Drainage Pattern Exhibit
5 Proposed Site Development & Drainage Pattern Exhibit
6 Table I - Priority Project Storm Water BMP Requirements Matrix
7 Table 2 - Anticipated & Potential Pollutants by Land Use Type
8 Table 4— Structural Treatment Control BMP Selection Matrix
9 Permanent Storm Water BMP Exhibit
10 Treatment Control BMP -Grass-lined Swale Detail
Appendices
Appendix A - Storm Water Requirements Applicability Checklists
Part A: Determine Priority Project Permanent Storm Water
BMP Requirements
Part B: Determine Standard Permanent Storm Water
Requirements
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
1.0 Purpose
This report has been prepared to address storm water pollution control objectives as
mandated by the Clean Water Act (CWA) and as regulated by the National Pollution
Discharge Elimination System (NPDES), the California Regional Water Quality Control
Board, San Diego Region (SDRWQCB), the Model Standard Urban Storm Water
Mitigation Plan (MSUSMP) for San Diego County and the City of Carlsbad Standard
Urban Storm Water Mitigation Plan, Storm Water Standards (SUSMP).
This report identifies storm water quality concerns associated with the development of
the 1265 Carlsbad Village Drive site. The discussion will include the identification of the
Receiving Waters for each discharge point, the Conditions of Concern (COCs) and the
Pollutants of Concern POCs). The narrative will also include descriptions of the existing
and proposed site drainage patterns and facilities. The plan will also address the
objectives of employing Best Management Practices (BMPs), coupled with an effective
monitoring and maintenance program as a means for providing long-term water quality,
to the maximum extent practicable (MEP).
The Water Quality Technical Report is submitted, as required, as part of the review
process for discretionary permit application. As such, this report will not address
construction related storm water concerns as provided for in the City of Carlsbad
SUSMP. Identification of construction related sources of water pollution and the
application of mitigating BMPs is typically discussed in the Storm Water Pollution
Prevention Plan (SWPPP). The subject project will not be required to prepare a SWPPP
as the area of disturbance is less than 1 acre. However, the waiving of the SWPPP
recuirement does not release the developer from the responsibility of obtaining a grading
permit and an approved erosion control plan. The specified BMPs shall be installed,
monitored and maintained, in an acceptable manner, as determined by City Inspection
Staff.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
2.0 Introduction
The Federal Water Pollution Control Act (also referred to as the Clean Water Act
[CWA]) was amended in 1972 to make it unlawful to discharge pollutants to the waters
of the United States from any point source, unless the discharge is in compliance with an
NPDES permit. In 1990, the U.S. Environmental Protection Agency (USEPA) published
final regulations that established storm water permit application requirements. The
RWQCB has since elected to adopt one statewide General Permit. In response, the
California Regional Water Quality Control Board, San Diego Region (SDRWQCB), has
published Order No. 2001-01, NPDES No. CA50108758 to enable the implementation of
Federally mandated controls on a local level. The order divides the region into
Watershed Management Areas (WMAs) and assigns Municipal Copermitteés to regulate
storm water related activities within a particular WMA.
Each Copermittee owns or operates a municipal separate storm sewer system (MS4)
through which it discharges urban runoff into waters of the United States within the San
Diego Region. Each Copermittee is responsible for meeting the provisions contained in
Division 7 of the California Water Code, the CWA and regulations adopted hereunder.
In accordance with Section F.1.b.(2) Order No. 2001-01, the Copermittees have approved
a Model SUSMP for San Diego County, Port of San Diego and Cities in San Diego
County.
The City of Carlsbad is identified as a Municipal Copermittee under Section 1 of
SDRWQCB, Order No. 2001-01. As a Copermittee, under Section 10 of Order No.
2001-01, the City of Carlsbad is responsible for implementing an Urban Runoff
Management Program (URMP) that is designed to reduce discharges of pollutants that
flow into and from MS4s to the maximum extent practicable (MEP). In addition, the
City of Carlsbad, under Section D.1 of SDRWQCB, Order No. 2001-01, has legal
authority to establish, maintain and enforce adequate legal authority to control pollutant
discharges into and from its MS4 through ordinance, statute, permit, contract or similar
means.
Pursuant to Section D.1 of the previously cited SDRWQCB order, the City of Carlsbad
has prepared a SUSMP to define Urban Runoff Requirements for Priority New
Development and Redevelopment Projects. The requirements of the SUSMP are
ap?licable to the 1265 Carlsbad Village Drive project as defined under Appendix A,
Storm Water Requirements Applicability Checklist.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
3.0 Determination of Applicable Storm Water BMP Requirements
The City of Carlsbad SUSMP provides Appendix A as a mechanism to determine the
Applicable Storm Water BMP Requirements. The SUSMP requires the completion of
Section 1, Part A and Part B, as part of the review process for application of discretionary
permit review. The checklist is designed to provide a standard to define and identify the
land use of Priority Projects.
The completion of SUSMP Appendix A, Section 1, Part A; indicates that the proposed
project development is defined under item 8 as Parking lots greater than or equal to 5,000
or with, at least 15' parking spaces that are potentially exposetO4 rba runoff. The
proposed development will include 36 parking spaces over an arep ofxxx square feet.
The completion of SUSMP Appendix A, Section 1, Part B; identifies that the project
proponent is cited as including the following elements as part of the proposed site
development.
Item 1 New impervious areas, such as rooftops, roads, parking lots, driveways, paths
and sidewalks
Item 2 New pervious landscape areas and irrigation systems
Item 4 Trash storage areas
Item 9 Any grading or ground disturbance during construction
The SUSMP also provides Table 1 - Standard Development Project & Priority Project
Storm Water BMP Requirements Matrix. A review of the matrix indicates that the
project is required to incorporate site design BMPs, source control BMPs and treatment
control BMPs. The project is also subject to BMPs applicable to individual Priority
Project Categories.
The completed checklists; Section 1, Part A: Determination of Priority Project Permanent
Stom Water BMP Requirements may be found in Appendix A, while the checklist for
Section 1, Part B: Determination of Standard Permanent Storm Water Requirements is
located in Appendix B of this report.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
4.0 Site Description
The project is located in the northwestern portion of the City of Carlsbad, southeast of
Carlsbad Village Drive west of Interstate 5 (Figure 1). The property fronts the existing
Carlsbad Village Drive and contains 0.46 fallow acres. The site topography contains
grades 8% and 33%. Elevation ranges are between 120 feet Mean Sea Level (MSL) at
the northeast site boundary to 111 feet MSL at the southwest project boundary. The
project area does not contain any existing structures, trees or groundcover.
4.1 Existing Drainage, Patterns and Facilities
The site is contained within the Agua Hedionda Watershed Basin Designation as
indicated in the Master Drainage and Storm Water Quality Management Plan City of
Carlsbad, California March, 1994. Flows from the project site are conveyed west, under
Interstate 5, by a double 24" RCP storm drain. The flows are intercepted in MS4s, City
of Carlsbad - Facility Designations BBB, BB and BBA. Facility BBA is indicated as a
30"RCP storm drain that outfalls to a location on the north bank of Agua 1-ledionda
Lagoon, east of Interstate 5.
The existing topography generally drains from northeast to southwest and is bound to the
northeast by an existing fire station, to the southeast by existing residential development,
to the southwest by an existing office building and to the northwest by the existing
Carlsbad Village Drive. The existing drainage regime includes offsite sheet flow
contributed by the existing fire station. Flows sheet flow across the site, from east to
west and are conveyed north, within an existing swale to a historical outfall location on
the existing Carlsbad Village Drive.
Existing onsite drainage patterns and facilities are delineated on Figure 4.
4.2 Proposed Site Development Drainage Patterns and Facilities
The proposed site development will consist of a multi-storied commercial building with
supporting onsite parking. The proposed building covers approximately 30% of the
parking area. The site is designed to mimic the historic runoff pattern by allowing storm
runoff to sheet flow across the parking lot in a southwesterly direction. The finish
surface, of the southwest, limit of the parking lot, will be even with the adjacent finish
grade, allowing flow to pass directly into a proposed grass-lined swale treatment BMP.
The swale location and direction of drainage mimics the historic condition. The treated
flows will be conveyed northerly to a proposed D-25 under sidewalk drain, located at the
historic outfall location on Carlsbad Village Drive.
Proposed onsite drainage patterns and facilities are delineated on Figure 5.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
5.0 Criteria for Identification of Pollutants of Concern
The City of Carlsbad SUSMP mandates that priority projects identify historical and
anticipated sources of pollutants. Procedures are outlined and information is provided to
aid in the identification of possible sources of pollution that may impair the beneficial
uses of a receiving water.
5.1 Identification of Pollutants From the Project Area
A site reconnaissance was performed on May 29, 2003 to identify possible existing
sources of pollution and conditions of concern.
The. site is accessed by a single driveway I dirt road. and has been cleared of buildings,
trees and groundcover. The project area contains a sparse cover of weeds.
Existing visible sources of pollutants appear to be denuded areas and light amounts of
trash. The fire station, located upstream of the site appears to contribute untreated runoff
from impervious building and parking lot areas. There is evidence of silt introduction to
run off in the form of ruts and small alluvial fans in the denuded areas. However there is
no apparent evidence of run off concentration points adjacent to the street or downstream
property that would indicate the introduction of silt.
Non-visible sources of pollutants from the site may include the introduction of
hydrocarbons from upstream fire department parking lot.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
5.2 Identification of Receiving Waters
The State Water Resources Control Board has adopted a Basin Plan that was initially
developed in the early 1960s by the State Department of Water Resources (DWR). The
purpose of the Basin Plan is to preserve water quality and protect the beneficial uses of
all regional waters in California. The Basin Plan recognizes the regional differences in
water quality and quantity, and is designed to facilitate administration of a water quality
plan. Subsequently, in the early 1970s, the State Board enumerated the Basin Planning
Areas, Hydrologic Units, Areas and Subareas of the State.
In accordance with the early DWR definitions, Hydrologic Units are the entire watershed
of one or more streams; hydrologic areas are major tributaries and/or major groundwater
basin within the Hydrologic Unit; and Hydrologic Subareas are major subdivisions of the
Hydrologic Areas including both water-bearing and nonwater-bearing formations.
These boundaries should not be confused with the CWA 303(d) designation, which
mandates the identification of impaired waters within the state and is discussed in Section
5.3 of this report.
The 1265 Carlsbad Village Drive site is located within:
Hydrologic Unit Basin Planning Area 9— San Diego
Carlsbad Hydrologic Unit - Basin Number 904.00
Agua Hedionda Hydrologic Area - 904.30
Los Monos Hydrologic Sub-Area - Sub-Basin Number 904.31
The Carlsbad Hydrologic Unit is a roughly triangular-shaped area of about 210 square
miles, extending from Lake Wohlford on the east to the Pacific Ocean on the west, and
from Vista on the north to Cardiff-by-the-Sea on the south. The unit includes the cities of
Oceanside, Carlsbad, Leucadia, Encinitas, Cardiff-by-the Sea, Vista and Escondido. The
unit is drained by the following creeks; Buena Vista, Agua Hedionda, San Marcos and
Escondido.
The Carlsbad Unit contains four major coastal lagoons; Buena Vista, Agua Hedionda,
Batiquitos and San Elijo. Agua Hedionda Lagoon is located at the mouth of Agua
Hedionda Creek in the City of Carlsbad. The lagoon is routinely dredged to keep it open
to the ocean. The lagoon serves as an integral part of a utility power plant cooling water
intake system and also serves as a reserve cooling water supply. A limited portion of the
lagoon supports an aquaculture farm, while the eastern portion of the lagoon is used for
water-oriented recreation.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
5.3 Identification of 303(d) Impaired Waters
Section 303(d)(1)(A) of the CWA specifies that each State shall identify those waters
within its boundaries for which the effluent limitations required by sections cited in the
CWA "are not stringent enough to implement any water quality standard applicable to
such waters. The State shall establish a priority ranking of such waters... taking into
account the severity of the pollution and the uses to be made of such waters."
In summary, the Clean Water Act Section 303(d) Water Body mandates that the State(s)
list the impaired bodies of water in which water quality does not meet applicable water
quality standards and/or is not expected to meet water quality standards, even after the
application of technology based pollution controls required by the CWA. The discharge
of urban runoff to these water bodies by the Copermittees is significant because these
discharges can cause or contribute to violations of applicable water quality standards.
The USEPA approved a list of Impaired Waters prepared by the SDRWQCB on 12 May
1999. The City of Carlsbad SUSMP requires the identification of all downstream
Receiving and Impaired Waters. According to the SDRWQCB the Impaired Receiving
Waters of the 1265 Carlsbad Village Drive project are defined as follows:
Agua Hedionda Lagoon
Regional —9 (San Diego)
Water Body Type "E" - Estuaries
Name - Agua Hedionda Lagoon
Caiwater Watershed - 90431000
Pollutant/Stressor - Bacteria Indicators
Potential Sources - Nonpoint/Point Source
TMDL Priority - Low
Estimated Size Affected - 6.8 acres
Proposed TMDL Completion - Not Available/Unpublished
Pollutant/Stressor - Sediment/Siltation
Potential Sources - Nonpoint/Point Source
TMDL Priority - Low
Estimated Size Affected - 6.8 acres
Proposed TMDL Completion -Not Available/Unpublished
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
5.4 Identification of Pollutants of Concern
The City of Carlsbad SUSMP states that upon identifying pollutants generated by
proposed priority projects, the receiving waters for each discharge point and the
pollutants identified in the 303(d) list, that a comparison be drawn to determine the
primary and secondary pollutants of concern.
The SUSMP contains Table 2 , which provides a list of "Anticipated and Potential
Pollutants Generated by Land Use Types". The listed pollutants reflect possible sources
of pollution related to the post-development land use.
The 1265 Carlsbad Village Drive project is a commercial development of less than
100,000 square feet with a supporting parking lot. Table 2 lists the following Potential
Pollutants Generated by Land Use Types:
Parking Lots
Sediments (if landscaping exists onsite)
Nutrients (if landscaping exists onsite)
Heavy Metals
Trash & Debris
Oxygen Demanding Substances (if landscaping exists onsite)
Oil & Grease
Pesticides (if landscaping exists onsite)
As previously noted in Section 5.3, the 303(d) Impaired Waters, the pollutants/stressors
identified as impairing Agua Hedionda Lagoon are categorized as Low Priority -
Bacteria Indicators and Low Priority - Sediment/Siltation.
Bacteria Indicators are analogous to bacteria and viruses that comprise the ubiquitous
microorganisms that thrive under certain environmental conditions. The proliferation of
bacteria and viruses is typically caused by the inclusion of animal or human fecal wastes
to the watershed. Coliform is an example of bacteria associated with fecal wastes.
Webster's Dictionary defines "coliform" as, of or relating to, or like the colon bacillus,
normally occurring in all vertebrate intestinal tracts. Escherichia coli. Water containing
excessive levels of bacterial indicators can alter the aquatic habitat and create a harmful
environment for humans and aquatic life.
Eutrophic forms of water pollution are manifest in bodies of water in which the increase
of mineral and organic nutrients has reduced the dissolved oxygen therefore, producing
an environment that favors plant life over animal life. Concentrations of nutrients, such
as nitrogen and phosphorus, in bodies of water can lead to excessive growth of aquatic
plants and algae. Excessive growth may cause above normal decay of organic material
and a subsequent reduction in dissolved oxygen in a process referred to as eutrophication.
Table 2 of the SUSMP specifically excludes Bacteria & Viruses from the General
Pollutant Categories associated with the project development.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
6.0 Criteria for Identification of Conditions of Concern
Changes to the hydrologic regime of a priority project would be considered a condition of
concern if the change(s) were to impact the "integrity of downstream channels and
habitat". To determine the Conditions of Concern, the SUSMP requires the following
steps be followed for each priority project.
Evaluate the projects COCs in a drainage (hydrology) report prepared by a
qualified registered civil engineer.
Section 6.1 of this plan provides a Summary Evaluation of the Preliminary
Hydrology Report.
Perform a field reconnaissance of the project area to observe and report on down
stream conditions.
The existing site observations are discussed in Section 4 of this plan, while the
relationship between the existing and developed conditions and the effect upon
run off characteristics is discussed in Section .1 of the WQTR.
Compute rainfall characteristics from the project area
Predevelopment and post-development runoff characteristics are calculated as
part of the Preliminary Hydrology Report. The findings thereof are discussed in
Section 6.1 of the WQTR
Water Quality Technical Report
Se Development Plan for 1265 Carlsbad Village Drive . Buccole Engineering, Inc.
Carlsbad Village Drive Investors, LLC
6.1 Summary Evaluation of the Preliminary Hydrology Report
A site reconnaissance was performed and drainage study completed to analyze effects of
the predevelopment and post development drainage impacts to the site. The existing site
observations are discussed in Section 4 of this report.
The proposed project will consist of a multi-storied commercial building with a
supporting parking lot. As previously mentioned, the proposed building will cover
approximately 30% of the proposed parking lot.
The existing hydrologic regime divides the site into two drainage basins. A small portion
of the site drains southwesterly, discharging 0.04 cfs to an offsite location. The greater
portion of the site drains westerly and contributes 0.85 cfs to Carlsbad Village Drive.
The developed site runoff condition mimics the historic drainage patterns.
A complete Preliminary Hydrology Report for the 1265 Carlsbad Village Drive Tentative
Map is included as part of the Review Process for Discretionary Actions.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
6.2 Identification of Conditions of Concern
Common impacts to the hydrologic regime resulting from development typically include
increased runoff volume and velocity; reduced infiltration; increased flow frequency,
duration and peaks; faster time to reach peak flow; and water quality degradation. These
changes have the potential to permanently impact downstream channels and habitat
integrity. A change to a priority project site's hydrologic regime would be considered a
condition of concern if the change would impact downstream channels and habitat
integrity.
Possible COCs, as identified in the SUSMP, that are associated with the development of
the 1265 Carlsbad Village Drive project include the following:
An increase in runoff volume
Reduced infiltration
Water quality degradation
The development of the 1265 Carlsbad Village Drive project will increase the site
runoff by 0.67 cfs. The Master Drainage and Storm Water Quality Management Plan,
dated March 1994 indicates that the site is part of a larger watershed that contributes
to an existing 72" RCP storm drain with a pipe slope of 0.93%. Assuming the depth
of flow in the 72" pipe to be '/2 the pipe diameter, or 3 feet, the pipe would carry
approximately 204 cfs. Employing this very conservative approach indicates that the
increase in flow to the receiving water is a negligible 0.3 %. However, it is safe to
assume that the storm drain facility is designed to carry flows approaching non-
pressure flow capacity. Such a comparison would yield an increase in flow of 0.1 %
to the entire downstream habitat and facilities. It is the determination of this report
that such a minor increase in flohe overall watershed does not constitute a negative
impact to downstream channels and habitat integrity.
Reduced infiltration and water quality degradation concerns are addressed by
employing site, source and treatment control BMPs; The site design BMPs are
discussed in Section 7.1 while, source control BMPs are addressed in Section 7.2 of
this report. The 1265 Carlsbad Village Drive project also proposes the construction
of treatment control BMPs that will reduce or remove pollutants of concern. The
selection and function the BMPs are discussed in Section 7.4 through 7.6 of the
WQTR.
Wafer Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.0 Establishing Storm Water Best Management Practices (BMPs)
The SUSMP dictates that all priority projects shall implement storm water, BMPs to
mitigate the identified pollutants and conditions of concern. BMPs shall follow the
requirements outlined in the SUSMP and shall be designed as to remove pollutants to the
maximum extent practicable. All priority projects shall incorporate the applicable storm
water BMPs into the project design. Table 1 - "Priority Project Storm Water BMP
Requirements Matrix" specifies the application of Site Design, Source Control and
Treatment Control BMPs based upon land use.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Duccola Engineering, Inc.
C9rlsbad Village Drive Investors, LLC
7.1 Site Design BMPs
Site Control BMPs shall minimize the introduction of pollutants to the maximum extent
possible (MEP). Priority projects will provide hydrologic project design that "attempts to
mimic" the natural hydrology.
The 1265 Carlsbad Village Drive project is a commercial development of less than
100,000 square feet with a supporting parking lot. Table 1 lists the requirements for the
application of Site Design BMPs. Section ifi (2)A —Maintain Pre-development Rainfall
Runoff Characteristics, provides examples of site design BMPs. The 1265 Carlsbad
Village Drive project employs the following Site Design BMPs:
Minimize impervious area
Incorporate landscape buffer areas
Drive aisles designed with minimal pavement width
Increased building density, minimized building footprint
Increase Rainfall Infiltration
. Direct rooftop runoff to pervious (landscape) areas
Maximize Rainfall Interception
Maximized canopy interception by the planting of trees and large shrubs
Minimize Directly Connected Impervious Areas (DCIAs)
Draining rooftops into adjacent landscaping prior to discharging to the
storm drain
Parking areas into adjacent landscaping
Slope protection
Planting and irrigating slope groundcover and canopy
The site layout has been designed to maintain pre-development runoff characteristics by
producing a modest increase of 0.67 cfs in total site runoff and by returning storm runoff
to historic outfall locations. Drive aisle widths have been minimized. Lot landscaping
will provide filtration for roof drains and lot runoff while, grated private drains will
capture debris and silt before flows outfall to the street. Runoff from slopes will be
conveyed across vegetated areas to minimize the possibility of introducing silt to the
runoff.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
C9rIsbad Village Drive Investors, LLC
7.2 Source Control BMPs
Source Control BMPs are designed to prevent storm water pollution at the source.
These BMPs shall be used in concert with Site Design BMPs to minimize the
introduction of pollutants to the maximum extent possible (MEP).
Reference is made to Section ifi (2)B - Source Control BMPs, which lists the
requirements for the application of Source Control BMPs. The 1265 Carlsbad Village
Drive project will employ the following Source Control BMPs:
Post signs and prohibitive language that prohibits illegal dumping at
public access points
. Maintain legibility of stencils and signs
. Use of efficient irrigation systems and landscape design
Irrigation systems are designed to address specific water requirements
. Covered Trash Enclosures
To further reduce the sources of pollutants, the parking lot shall receive regularly
scheduled sweeping. CCRs will specify that outdoor or uncovered storage of materials is
not acceptable.
The landscape plan is designed to maximize canopy interception by providing a generous
number and varied palette of trees and shrubs. In addition, ground-coverings have been
selected to create areas for storm water treatment. Moreover, the specific irrigation
recuirements for each landscape area have been considered and addressed during the
landscape design process.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Duccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.3 BMPs for Individual Priority Project Categories
The City of Carlsbad SUSMIP requires that storm water BMPs shall be selected during
the design process for applicable priority projects. The following is a listing of
Individual Priority Project Categories as cited in Section ifi (2)C that are a part of the
proposed development and are addressed in the site design:
. Surface Parking Areas
The remaining list of Individual Priority Project Categories are contained herein, however
are not applicable to the 1265 Carlsbad Village Drive project:
Private Roads
Residential Driveways & Guest Parking
Dock Areas
Maintenance Bays
Vehicle & Equipment Wash Areas
Outdoor Processing Areas
Non-retail Fueling Areas
Hillside Landscaping
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
C9r!sbad Village Drive Investors, LLC
7.4 Selection of Treatment Control BMPs
The SUSMP states that projects shall be designed to remove pollutants of concern from
the storm water conveyance system to the maximum extent practicable (MEP) through
the incorporation of treatment control BMPs. Treatment control BMPs must be
implemented unless, a wavier is granted to the project by the City Engineer, which
indicates the lack of a feasible treatment control BMP.
Priority projects shall be designed to remove pollutants of concern from the storm water
conveyance system to the MEP through the use of treatment control BMPs. The
selection process also requires the comparison of the list of pollutants for which the
downstream receiving waters are impaired, with the anticipated pollutants generated by
land use. Refer to Section 5.1 of this report, Identification of Pollutants of Concern, for a
complete list of Primary and Secondary Pollutants of Concern. Where a site generates
both primary and secondary pollutants of concern, as is the case with 1265 Carlsbad
Village Drive, the primary pollutants of concern shall receive priority for BMP selection.
The SUSMP provides a Treatment Control BMP Selection Matrix as a reference in
determining the appropriate treatment control BMP(s).
The 1265 Carlsbad Village Drive project employs a combination of vegetated areas and
swales that perform as biofiltration treatment BMPs to reduce the Pollutants of Concern.
The selection of grass-lined swales as biofilter treatment BMPs is based upon the
physical constraints posed by the size of the site and the required number of parking
spaces.
A comparison between the efficiency of the treatment control BMPs, as listed in Figure 8,
and the pollutant priority (low or medium, per Section 4.1) of the impaired receiving
waters indicate that the selected Treatment Control BMP efficiency is equal to or exceeds
the impaired water pollutant priority.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.5 Numeric Sizing Design
The SUSMP provides criteria for the Numeric Sizing Design of treatment control BMPs.
The sizing of treatment control BMPs may be based upon flow or volume calculations.
The calculation provided in this report is based upon the flow rate of runoff produced
from a rainfall intensity of 0.2 inch of rainfall per hour for each hour of a storm event as
described in Section ifi (2) D, Table 3 - Numeric Sizing Treatment Standards of the
SUSMP.
Calculation of the 85th percentile runoff is as follows:
Q = C I A where C = Runoff Coefficient, San Diego County criteria
I =0.2 inches
A = Basin Area, in acres
The 1265 Carlsbad Village Drive site is contains a two storm water drainage basins. The
hydrology study and Figure 9 identify the treatment BMP type and location for the two
runoff basins.
The flow based calculation for the eastern storm water drainage basin, grass-lined swale
treatment BMP is as follows:
Node 108 where C 0.85
1= 0.2
A =0.08
Q =0.Olcfs
The flow based calculation at the western storm water drainage basin, grass-lined swale
treatment BMP is as follows:
Node 206 where C = 0.85
1= 0.2
A=0.41
Q =0.07cfs
Calculations indicating the flow characteristics of each grass-lined swale are contained on
the following two pages. Channel calculations are based upon a trapezoidal channel 10
feet wide with side slopes of 4:1 (horizontal:vertical) and a base width of 4 feet, a
longitudinal slope of 1% (respectively) and a Manning's n value of 0.033 (Handbook of
Hydraulics, Brater & King, 6th edition).
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.5 Numeric Sizing Design (cont.)
The City and County of Los Angeles have created a Manual for the Standard Urban
Stormwater Mitigation Plan (SUSMP). The manual provides an introduction, permitting
and inspection procedures, the body of the SUSMP, tables and appendices. Appendix B,
of the manual, provides criteria for the design of treatment control BMPs. Since the City
of Carlsbad SUSMP does not provide treatment BMP design criteria, this plan refers to
the design criteria outlined in Appendix B, B.13 Vegetative Swale, of the Los Angeles
SUSMP Manual.
As outlined in the LASUSMP, Appendix B.13, Table 1, the criteria for swale
performance is listed by parameter, optimal and minimum criteria, and is summarized as
follows:
Criteria
Hydraulic residence time
Average flow velocity
Swale width
Swale length
Swale slope
Side slope ratio (horiz:vert)
Optimal - Minimum
9 minutes - 5 minutes
0.9 fps - not available, not published
8 feet - 2 feet
200 feet - 100 feet
2-6%-1%
4:1 —2:1
Swale Performance Data at Node 108 is as follows:
Flow rate of system = 0.01 cfs
Longitudinal slope of system = 1.0%
Swale shape = trapezoidal
Channel base width .= 4 feet
Side slope ration = 4:1
Depth of Flow (Normal Depth) = 0.01 feet
Velocity of channel flow = 0.26 fps
Swale Performance Data at Node 208 is as follows:
Flow rate of system = 0.07 cfs
Longitudinal slope of system = 1.0%
Swale shape = trapezoidal
Channel base width =4 feet
Side slope ration = 4:1
Depth of Flow (Normal Depth) = 0.01 feet
Velocity of channel flow = 0.85 fps
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.6 Location of Treatment Control BMPs
According to the SUSMP treatment control BMPs should be implemented close to
pollution sources to minimize costs and maximize pollutant removal prior to runoff
entering receiving waters and may be combined with flood control structures.
The grass-lined swale treatment control BMPs are located adjacent to the source of
runoff.
The locations of the treatment control BMPs are delineated on Figure 9 of this report.
Water Qualify Technical Report
SYte Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.7 Infiltration BMPs - Use and Restrictions
BMPs that are designed to function primarily as infiltration devices, such as infiltration
basins and trenches, are subject to restrictions as outlined in the SUSMP. As
groundwater basin data becomes available, the City Engineer may develop restrictions on
the use of incidental infiltration devices such as grassy swales, vegetated buffer strips,
detention basins or constructed wetlands.
Three factors significantly influence the potential for urban runoff infiltration devices to
contaminate ground water basins. They are (i) pollutant mobility, (ii) pollutant
abundance in urban runoff and (iii) soluble fraction of pollutant. The risk of
contamination of groundwater may be reduced by pretreatment of urban runoff. A
discussion of the limitations and guidance for the application of infiltration practices is
contained in the Environmental Protection Agency Report Number EPA/600/R-941051,
Potential Groundwater Contamination from Intentional and Nonintentional Stormwater
Infiltration, USEPA (1994).
To protect groundwater quality, the City Engineer may apply restrictions to the use of
any BMPs that are designed to primarily function as infiltration devices. As additional
groundwater basin data is obtained, the City Engineer may develop additional restrictions
on the use of any BMPs that allow for incidental infiltration. At present, the City
Engineer has not imposed specific restrictions on the use of incidental infiltration
devices. However, the use of structural treatment control BMPs that are designed to
primarily function as infiltration devices shall meet the following conditions.
Applicable Restrictions
. All dry weather flows shall be diverted from infiltration devices.
Dry weather flows include, but are not limited to, irrigation runoff, hosing down
driveways and car washing. The 1265 Carlsbad Village Drive project will
comply with this restriction by use of efficient irrigation systems and landscape
design and by Covenant, Condition and Restriction that prohibits the washing of
cars or hosing down rather than sweeping driveways and parking areas.
Pollution prevention and source control BMPs shall be implemented at a level
appropriate to protect groundwater quality at sites where infiltration structural
treatment control BMPs are used.
As cited in Section 7.4 of the WQTR, the 1265 Carlsbad Village Drive site
contains landscape areas that provide filtration
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering.1 Inc.
Carlsbad Village Drive Investors, LLC
7.7 Infiltration BMPs - Use and Restrictions (cont.)
Non-Applicable Restrictions
. Urban runoff from commercial developments
Vertical distance from the base of an infiltration device the seasonal high
groundwater mark shall be at least 10 feet, or as determined by the City Engineer
The soil through which infiltration is to occur shall have physical characteristics
that are adequate for proper infiltration and for the protection of groundwater for
beneficial uses
Infiltration structural treatment control BMPs shall not be used in areas of
industrial or light industrial activity
. The horizontal distance between the base of any infiltration BMP and water
supply wells shall be 100 feet or as determined by the City Engineer.
100 feet or as determined by the City Engineer.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
7.8 Wavier of Treatment Control BMP Requirements
The City Engineer may provide for a project to be waived from the requirement of
implementing structural treatment control BMPs (discussed in Section 3.2.4) if
infeasibility can be established. Waivers may only be granted from structural treatment
control BMP and structural treatment control BMP sizing requirements. Priority
development projects, whether or not granted a waiver may not cause or contribute to an
exceedance of water quality objectives. Pollutants in runoff from projects granted a
waiver must still be reduced to the maximum extent practicable.
The City must notify the Regional Board within 5 days of each waiver issued and shall
include the name of the person granting each waiver. A SUSMP waiver impact fee
program may be established by the City.
As an alternative to implementing structural treatment control BMPs on site, the City
may also implement the Local Equivalent Area Drainage (LEAD) Method pursuant to the
requirements set forth in the SUSMP.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccole Engineering, Inc.
Carlsbad Village Drive Investors, LLC
8.0 Storm Water BMP Maintenance
The City Engineer will not consider structural BMPs "effective", and therefore will not
accept storm water BMPs as meeting the MEP standard, unless a mechanism is in place
that will insure ongoing long-term maintenance of all structural BMPs. This mechanism
shall be proposed by the project proponent as part of the SWMP and will be refined
through the City review process until satisfactory verification of maintenance is provided
to the City Engineer. Such verification may include but is limited to covenants, legal
agreements, maintenance agreements and / or conditional use permits.
8.1 Maintenance Mechanisms
The SUSMP suggests several mechanisms for providing long-term maintenance. The
1265 Carlsbad Village Drive project proposes to entering into a "Project proponent
agreement to maintain storm water BMPs" as cited under Section V.4 of the SUSMP.
The project proponent (developer) proposes to enter into an agreement with the City to
provide funding for maintenance costs.
This option was selected from the list of potential maintenance mechanisms because of
the use of a grass-lined swale treatment control BMPs that are an integral part of the site
design and landscape plan. Since the BMPs are not separate from the landscape, but
rather are a part of the whole, the 1265 Carlsbad Village Drive project proposes to assign
long-term maintenance-funding responsibility to the project proponent, with the
knowledge that City staff will verify BMP maintenance. As such, the BMPs will be
maintained and would not be neglected or fall into disrepair.
8.2 Verification Mechanisms
For discretionary projects, the City approved method of storm water BMP maintenance
shall be incorporated into the projects permit, and shall be consistent with permits issued
by resource agencies, before City approval of discretionary permits. For projects only
ministerial permits, the City-approved method of storm water BMP maintenance shall be
incorporated into the permit conditions before the issuance of any ministerial permits. In
all instances, the project proponent shall provide proof of execution of a City-approved
method of maintenance repair and replacement before the issuance of construction
approvals. For public projects that are not required to obtain permits, the City shall be
responsible for ensuring that an approved method of storm water BMP maintenance
repair and replacement is executed prior to the commencement of construction. For all
properties, the verification mechanism will include the project proponent's signed
statement, a part of the project application, accepting responsibility for all structural BMP
maintenance, repair and replacement, until a City approved entity agrees to assume
responsibility for structural BMP maintenance, repair and replacement.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
8.3 Maintenance Requirements
Operation & Maintenance (0 & M) Plan - The City requires that a copy of an Operation
& Maintenance (0 & M) Plan, prepared by the project proponent satisfactory to the City
Engineer, is attached to the approved maintenance agreement, which describes the
designated responsible part to manage the storm water BMP(s), employee's training
program and duties, operating schedule, maintenance frequency, routine service schedule,
specific maintenance activities, copies of resource agency permits, and any other
necessary activities. At a minimum, maintenance agreements shall require the inspection
and servicing of all structural BMPs on an annual basis. The project proponent or City-
approved maintenance entity shall complete and maintain 0 & M forms to document all
maintenance requirements. Parties responsible for the 0 & M plan shall retain records
for at least 5 years. These documents shall be made available to the City for inspection
upon request at any time.
Access Easement/Agreement: As part of the maintenance mechanism selected above, the
City requires the inclusion of a copy of an executed access easement that shall be binding
on the land throughout the life of the project, until such time that the storm water BMP
requiring access is replaced, satisfactory to the City Engineer.
9.0 Summary and Conclusion
This report has been prepared in accordance with the City of Carlsbad SUSMP. The
WQTR has identified sources of potential pollutants for the historic condition and has
also identified the receiving and impaired waters below the project site. The plan
identifies potential sources of pollution associated with the development of the 1265
Carlsbad Village Drive project and cites the implementation of mitigating BMPs for the
post-construction condition. The plan also makes provision the long-term funding of a
maintenance program that will protect water quality to the maximum extent practicable.
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Duccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
10.0: Figures
1 Vicinity Map
2 USGS Location Map
3 85th Percentile Precipitation lsopluvial Map
4 Existing Site Condition & Drainage Pattern Exhibit
5 Proposed Site Development & Drainage Pattern Exhibit
6 Table I - Priority Project Storm Water BMP Requirements Matrh
7 Table 2 - Anticipated & Potential Pollutants by Land Use Type
8 Table 4— Structural Treatment Control BMP Selection Matrix
9 Permanent Storm Water BMP Exhibit
10 Treatment Control BMP -Grass-lined Swale Detail
Water Quality Technical Report
SLte Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
carlsbad Village Drive Investors, LLC
CITY OF OCEANSIDE
HIGHWAY
~kn
CITY OF VISTA
CITY OF
SAN MARCOS
CITY OF ENCINITAS
PREPARED IN THE OFFICE OF:
1? LT(7('(2.[4 760/721-2000
ENGINEERING, inc
312 Vista Way, Sztitc 301, Oceanside, CA 92056 NOT To SCALE
1265 CARLSBAD WAGE DRIVE
WATER QUALJ7Y TECHNICAL REPORT
FIGURE 1
V7CINIfl' iWJ'
PREPARED IN THE OFFICE OF
BUCCOLA
:
760/721-2000
ENGINEERING, inc
3142 Vista Way, Suite 301, Oceanside, CA 92056 NOT TO SCALE
1265 C',4RLSB4D WAGE DRIVE
WATER QUALI7Y TECHNICAL REPORT
FIGURE 2
USGS LOCATiON MAP
..
I I,9 10 dip I L - L!P4 •,
ELJ
. I -.I- - F.,-.
'I
ii
4-
I Ii I
LEGEND
DIRECTiON OF SHEET FLOW
WATERSHED BOUNDARY -
+
PREPARED IN THE OFFICE OF:
B LJCO11114 760/721-2000
ENGINEERING, inc
3142 Vista Way. Suite 301, Oceanside, CA 92056 SCALE. 1" = 30'
1265 CP4RLSB4D WAGE DRIVE
WATER QUAU7Y TECHNICAL REPORT
FIGURE 4
EXIS71NC SITE CONDII1ON AND
DR4IN4GE PATTERN EXHIBIT
LEGEND
DIRECT/ON OF SHEET FLOW
WATERSHED BOUNDARY
DIRECT/ON OF FLOW, STORM DRAIN
1265 CARLSBAD ViLLAGE DRIVE
PREPARED IN THE OFFICE OF:
WATER QUALI7Y TECHNICAL REPORT
BUCCOLA 760/7212000 FIGURE 5 ENGINEERING, inc PROPOSED SITE DEVELOPMENT AND " = 3142 Vista Way, Suite 301, Oceanside, CA 92056 SCALE: 1 JO'
DRAINAGE PATTERN EXHIBIT
Table 1. Anticipated and Potential Pollutants by Land Use Types
General Pollutant Categories
Priority Project
Categories Sediments Nutrients Heavy
Metals
Organic
Compounds
Trash &
Debris
Oxygen
Demanding Oil &
Grease
Bateria &
Viruses Pesticides
Substances
Detached
Residential X X X X X X X
Development
Attached
Residential X X x P(1) °(2) P x
Development
Commercial
Development> P(i) P('i) P(2) X P(5) X P(3) P(5)
100, 000 sq ft
Automotive
Repair X X(4)(5) X X
Shops
Restaurants X X X X
t> X X X X X X [HE
ill
s
id
e
t
s .
Streets,
Highways & X P(1) X X(4) X P(5) X
Freeways
_______ ______ ____ ________ ______
X = Anticipated
P = Potential
1. A potential pollutant if landscaping exits on—site.
2 A potential pollutant if the project includes uncovered parking areas.
J. A potential pollutant if land use involves food or animal waste products.
Including petroleum hydrocarbons.
Including solvents.
Source: City of Oceanside SUSUP
C3IDENTiFiED AS A PRIORITY PROJECT LAND USE TYPE, CITED IN SECTION 5.1
IDENTiFiED AS AN ANTiC/PA TED/POTENTL4L POLLUTANT BY LAND USE TYPE, CITED IN SECTION 5.1
PREPARED IN THE OFFICE OF: 1265 CARLSBAD I4LL14GE DRIVE
B LJ'2L.IJ1 760/721-2000 WATER QUALITY TECHNICAL REPORT
ENGINEERING, inc FIGURE 6
3142 Vista Way, Site 301, Oceanside, CA 92056 POLLUTAN1S BY LAND USE TYPE
Table 2. Priority Project Storm Water BMP Requirements Matrix
Requirements Applicable to Individual Priority Project Categories "
-
oj t
Priority Project Site Source -- -
Ei . . . Treatment
Categories Desian
BMPs
Control
BMPs c
c-
. i' c c
Control
BMPs (2)
Detached
Residential R R R R R R
Development
Attached
Residential R R R R
Development
Commercial -
Development> R R R R R R R
100,000 sq ft
Automotive
Repair R R R R R R R R
Shops
Restaurants R R R R R
Hillside
R R R R R
ts Lt>
R r pi
Streets,
Highways & R R R R
Freeways
R = Required
Projects are subject to the requirements of all priority project categories that apply.
Select one or more applicable and appropriate treatment control BMPs from Attachment B.
Applies if the paced area totals .> 5,000 square feet or with > 15 parking spaces and is
potentially exposed to urban runoff.
Source: City of Oceanside SUSMP
IDENTIFIED AS PRIORI?)' PROJECT LAND USE TYPE, CITED IN SECTION 7.4
I (IDENTIfiED AS A REQUIRING APPLICABLE BliPs FOR AN INDIVIDUAL PRIORI?)' PROJECT
AS CITED IN SEC17ONS 7.3
PREPARED IN THE OFFICE OF: 1265 C4RLS84D KLUGE DRIVE
B UCCOLA 760/721-2000 WATER QUALITY TECHNICAL REPORT
ENGINEERING, inc FIGURE 7
3142 Vista Way, Suite 301, Oceanside, CA 920i6 STORM WATER ShIP REQU/RE44IEN15 MATRIX
Table 4. Treatment Control BMP Selection Matrix
Treatment Control B/VIP Categories
Pollutant of s •• ion ers Detention Infiltration Wet Ponds or Drainage
Inserts 1 ra lOfl Filtration
Hydro dynamic
Concern Basins Basins(l)Wetlands eParap5
Sediment #1 H H H L H Al
Nutrients Al 4! Al L U L
Heavy Metals M Al Y.*..,. H L H L
Organic
Compounds U U U U L Al L
Trash & Debris L H U U M H M
Oxygen .•..•. .... ..
Demanding .L.. Al .... A1. U L M L
Substances .. •......... _______ _______ __________ ______ ______ __________
Bacteria U U H U L U L
Oil & Crease Al Al V U L H L
Pesticides U U U U L U L
Including trenches and porous pavement.
Also known as hydrodynamic devices and baffle boxes.
L: Low removal efficiency
Al: Medium removal efficiency
H. High removal efficiency
U. Unknown removal efficiency
.source: Guidance 5pecitying Management Measures tor .5ources of Nonpoint Pollution in
Coastal Waters (1993), National Stormwater Best Management Practices Database (2001),
and Guide for B/VIP selection in Urban Developed Areas (2001).
IDENTIFiED AS A POLLUTANT OF CONCERN, AS CITED IN SECTION 5.4
SELECTED AS TREATMENT CONTROL SUP, AS CITED IN SECTION 74
PREPARED IN THE OFFICE OF. 1265 04RLSB4D ViLLAGE DRIVE
BUCCOLA 760/721-2000 WATER QUALITY TECHNICAL REPORT
ENGINEERING, inc FIGURE 8
3142 Vista Way, Suite 301, Oceanside, CA 92056 7R7ME,7 CONTROL 8/IP SELECTION MATRIX
SCALE: i = 30'
LEGEND
GRASS—LINED SWALE TREATEMENT BMP—
LANDSCAPE AREA
NOTES
MAINTENANCE PERSONNEL SHALL RECEIVE TRAINING REGARDING THE
INTENT, IMPLEMENTATION AND MAINTENANCE OF BMPs.
LANDSCAPE AND IRRIGATION SHALL BE MAINTAINED IN SUCH A
MANNER AS TO INSURE IRRIGATION RUNOFF PLANT DEBRIS. AND
SOIL OR SILT DO NOT ENTER THE STORM bRA/N.
j PLANT MATERIAL SHALL BE MAINTAINED OR REPLACED AS
NECESSARY TO PRO kIDE ADEQUATE GROUND COVER AND SILT
CONTAINMENT.
PAVED AREAS SHALL RECEIVE REGULARLY SCHEDULED SWEEPING.
STORM DRAIN INLETS SHALL RECEIVE PROHIBITiVE STENCILING
AND/OR SIGNAGE TO THE SATISFACTION OF THE CI1Y ENGINEER,
PER SECTION 6.Y OF THE SWMP.
THE ARCHITECT SHALL DESIGN ROOF—DRAIN DOWNSPOU15 IN
LOCATIONS THAT ALLOW FOR FLOW ACROSS LANDSCAPE AREAS
PRIOR TO ENTERING THE PRIVATE DRAIN SYSTEM.
Z PLANTING AND IRRIGATiON SPECIFiCATIONS PER LANDSCAPE PLAN.
PREPARED IN THE OFFICE OF:
Jj L,''Q[,1 760/721-2000
ENGINEERING, inc
3142 Vista Way, Suite 301, Oceanside, CA 92056
1265 C4RLSB4D 1LLAQE ORfl'f
WATER QUALITY TECHNICAL REPORT
FIGURE 9
POST CONSTRUCI1ON
PH4SE BMP EXHIBIT
CURL
AC PAvMIvim1. .
VIc74MILF1A'I
DETAIL
GRASS-LINED SWALE
TREATMENT BMP
NOT TO SCALE
PREPARED IN THE OFFICE OF: 1265 C4RLSB4D I'ILLAGE DRIVE
I? (Jc7'9[,14 760/721-2000 WATER QUALITY 7ECHNIC4L REPORT
ENGINEERING, inc FIGURE 10
3142 Vista Way, Suite 301, Oceanside, CA 92056 7REA7MENT BAIP DETAIL
Appendices
Appendix A - Storm Water Requirements Applicability Checklists
Part A: Determine Priority Project Permanent Storm Water
BMP Requirements
Part B: Determine Standard Permanent Storm Water
Requirements
Water Quality Technical Report
Site Development Plan for 1265 Carlsbad Village Drive Buccola Engineering, Inc.
Carlsbad Village Drive Investors, LLC
Storm Water Standards
4/03/03
APPENDIX A
STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST
Complete Sections 1 and 2 of the following checklist to determine your project's
permanent and construction storm water best management practices requirements.
This form must be completed and submitted with your permit application.
Section 1. Permanent Storm Water BMP Requirements:
If any answers to Part A are answered "Yes," your project is subject to the "Priority
Project Permanent Storm Water BMP Requirements," and "Standard Permanent StormS
Water BMP Requirements" in Section III, "Permanent Storm Water BMP Selection
Procedure" in the Storm Water Standards manual.
If all answers to Part A are "No," and gny answers to Part B are "Yes," your project is
only subject to the "Standard Permanent Storm Water BMP Requirements". If every
question in Part A and B is answered "No," your project is exempt from permanent
storm water requirements.
Part A: Determine Priority Project Permanent Storm Water BMP Reauirements.
Does the project meet the definition of one or more of the priority project
categories?* Yes
-
No
-
Detached residential development of 10 or more units
Attached residential development of 10 or more units
Commercial development greater than 100,000 square feet -
Automotive repair shop -
Restaurant
Steep hillside develcpment greater than 5,000 square feet -
Project discharging to receiving waters within Environmentally Sensitive Areas -
Parking lots greater than or equal to 5,000 ft2 or with at least 15 parking spaces, and
potentially exposed to urban runoff -
Streets, roads, highways, and freeways which would create a new paved surface that is
5,000 square feet or greater - -
* Refer to the definitions section in the Storm Water Standards for expanded definitions of the priority
project categories.
Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered
prority projects. Parking lots, buildings and other structures associated with utility projects are
p(ority projects if one or more of the criteria in Part A is met. If all answers to Part A are "No",
ccntinue to Part B.
Storm Water Standards
4/03/33
Part B: Determine Standard Permanent Storm Water. Reg uirements.
Does the project propose: Yes No
New impervious areas, such as rooftops, roads, parking lots, driveways, paths and
sidewalks?
-
New pervious landscape areas and irrigation systems?
Permanent structures within 100 feet of any natural water body? -
Trash storage areas? -
Liquid or solid material loading and unloading areas? -
Vehicle or equipment fueling, washing, or maintenance areas? -
Require a General NPDES Permit for Storm Water Discharges Associated with
Industrial Activities (Except construction)?*
-
Commercial or industrial waste handling or storage, excluding typical office or
household waste? -
Any grading or ground disturbance during construction? .. i.-
Any new storm drains, or alteration to existing storm drains?
*10 find out if your project is required to obtain an individual General NPDES Permit for Storm Water
Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site
at, www.swrcb.ca.gov/stormwtr/industrial.html