HomeMy WebLinkAboutGPA 05-06; AURA CIRCLE; STORM WATER MITIGATION PLAN;'
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
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TABLE OF CONTENTS (continued)
10.0 Figures, Tables & Appendices
Figure -1 Vicinity Map
Figure - 2 USGS Location Map
Figure - 3 85th Percentile Precipitation lsopluvial Map
Figure - 4 Existing Site Condition & Drainage Pattern Exhibit
Figure - 5 Proposed Site Condition & Drainage Pattern Exhibit
Figure - 6 Post Construction Storm Water BMP Exhibit
Figure - 7 Treatment Control BMP -"Stormceptor" Detail
Table -1 Storm Water BMP Requirements Matrix
Table - 2 Pollutants by Land Use Type
Table - 4 Treatment Control BMP Selection Matrix
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
Part C: Determine Construction Phase Storm Water
Requirements
Part D: Determine Construction Site Priority
Appendix B -Operation & Maintenance Plan
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1.0 Purpose
This plan 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 plan identifies storm water quality concerns associated with the development of the
Aura Circle site. The discussion will include the identification of the Receiving \.Vaters
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 (B:MPs), coupled with an effective monitoring
and maintenance program as a means for providing long~term water quality, to the
maximum extent practicable (MEP).
The Storm Water Mitigation Plan is submitted as required by the review process for
discretionary permit application. As such, this plan 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
will be discussed in the Storm Water Pollution Prevention Plan (SWPPP) as part of the
construction permit review and approval process.
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2.0 Introduction
The Federal Water Pollution Control Act (also referred to as the Clean Water Act
[CW A]) 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 QuaEty Control Board, San Diego Region (SDRWQCB), has
published Order No. 2001-01, NPDES No. CAS0108758 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 Copermittees 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. l .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, penmt, 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 "C"rban Runoff Requirements for Priority New
Development and Redevelopment Projects. The requirements of the SCSMP are
applicable to the Aura Circle project as defined under Appendix A, Storm Water
Requirements Applicability Checklist.
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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 Priority
Project Permanent Storm Water BMP Requirements categories are as follows:
Item I
ltem 6
Item 9
Detached residential development of 10 or more units
Steep hillside development greater than 5,000 square feet
Streets, roads, highways and freeways which would create a new paved
surface that is 5,000 square feet or greater
The completion of SUSMP Appendix A, Section 1, Part B; identifies that the project
proponent is required to include 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 9 Any grading or groW1d disturbance during construction
Item IO Any new storm drains, or alteration to existing storm drains
The SUSMP also provides Table 1 -Standard Development Project & Priority Project
Stonn Water BMP Requirements Matrix. A review of the matrix indicates that the
project is required to incm:porate site design BMPs, source control BMPs and treatment
control BMPs. The project is also subject to BJvIPs applicable to individual Priority
Project Categories.
The completed checklists; Section 1, Part A: Determination of Priority Project Permanent
Storm Water BMP Requirements may be found in Appendix A, while the checklist for
Section 1, Part B: Determination of Standard Pennanent Storm Water Requirements is
located in Appendix B of this report.
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4.0 Site Description
The project is located in the rnid•northem portion of the City of Carlsbad, southwest of El
Camino Real, north of Kelly Drive (Figure 1). The property is situated at the northern
terminus of Aura Circle and contains just over 15 acres of vacant hillside terrain. The
site topography contains grades of less than 15% with interspersed areas containing
slopes that exceed 40%. Elevation ranges are between 56 feet Mean Sea Level (MSL) at
the southern site boundary to 238 feet MSL at the northwest project boundary. The
project area contains an existing outbuilding that was constructed by the owner of lot 297
of the Laguna Rivera Unit 9 subdivision. The building encroaches upon the site and will
be removed. The remainder of the site is vacant and contains low•lying grasses and
shrubs.
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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. The existing topography drains southeastward within
two predominant canyons located in the lower two-thirds of the site. The flows are
intercepted by two existing B-inlets. The supporting MS4 conveys the runoff south and
west. The storm drain continues easterly to form a confluence with an existing concrete
drainage channel. The channel conveys the local basin runoff in a southerly direction to
an existing outfall location on the northeast end of Agua Hedionda Lagoon.
Existing onsite drainage patterns and facilities are delineated on Figure 4.
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4.2 Proposed Site Development Drainage Patterns and Facilities
The proposed site development will consist ofa detached single-family development with
supporting infrastructure. The site is designed to mimic the historic runoff pattern by
conveying runoff to the existing MS4. Runoff from developed lots will be treated within
landscape areas and vegetated swales. The 85th percentile street runoff will be treated by
a hydrodynamic separator.
Proposed onsite drainage patterns and facilities are delineated on Figure 5.
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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.
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( 5.1 Identification of Pollutants From the Project Area
A site reconnaissance was performed on June 23, 2003 to identify possible existing
sources of pollution and conditions of concern.
Site access is by way of the existing Aura Circle. Portions of the site have been
previously graded as part of providing access. There is also evidence of disking on
portions of the site. The remaining area contains a sparse cover of weeds and shrubs.
Existing visible sources of pollutants appear to be denuded areas and light amounts of
trash. There is evidence of silt introduction to run off in the fonn 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.
The site does not appear to have any obvious signs of non-visible sources of pollutants.
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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 (D\VR). 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 Aura Circle 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 dramed 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 sen,es 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.
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5.3 Identification of 303(d) Impaired Waters
Section 303(d)(l)(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
CW A "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 Aura Circle project are defined as follows:
Agua Hedionda Lagoon
• Regional - 9 (San Diego)
• Water Body Type "E" -Estuaries
• Kame-Agua Hedionda Lagoon
• Calwater 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
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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 Aura Circle project is a detached residential development with a supporting cul-de-
sac street. Table 1 lists the following Potential Pollutants Generated by Land Use Types:
Detached Residential Development
• Sediments (Anticipated)
• Nutrients (Anticipated)
• Trash & Debris (Anticipated)
• Oxygen Demanding Substances (Anticipated)
• Oil & Grease (Anticipated)
• Bacteria & Viruses (Anticipated)
• Pesticides (Anticipated)
Hillside Development> 5,000 square feet
• Sediments (Anticipated)
• Nutrients (Anticipated)
• Trash & Debris (Anticipated)
• Oxygen Demanding Substances (Anticipated)
• Oil & Grease (Anticipated)
• Pesticides (Anticipated)
Streets
• Sediments (Anticipated)
• Nutrients (Potential, iflandscaping exists onsite)
• Heavy Metals (Anticipated)
• Organic Compounds (Anticipated, including petroleum hydrocarbons)
• Trash & Debris (Anticipated)
• Oxygen Demanding Substances (Potential, including solvents)
• Oil & Grease (Anticipated)
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5.4 Identification of Pollutants of Concern (cont.)
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.
Sediments are soils or other surficial materials, which are eroded and then transported or
deposited by the action of wind, water, ice or gravity. Sedimentation/siltation can
increase turbidity, clog fish gills, reduce spawning habitat, lower young aquatic organism
survival rates, smother bottom dwelling organisms and suppress aquatic vegetation
gro\\-1h.
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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 S'WMP.
• 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 SWMP. A Preliminary Hydrology Report has been submitted
to the City of Carlsbad as of the Review Process for Discretionary Penni ts.
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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 10 lot detached residential development with an
adjacent open space lot and a supporting cul-de-sac street. The anticipated impervious
area will cover approximately 30% of each single-family lot.
The existing hydrologic regime divides the site into three drainage basins. The site
presently contributes an estimated 18.1 cfs to the existing MS4.
The developed site runoff condition mimics the historic drainage patterns. Flows are
directed and intercepted in the same location by the existing MS4. The Preliminary
Hydrology Report shows a combined runoff of 19.1 cfs indicating a modest increase of 1
cfs for aQ100 event storm or 5%.
A complete Preliminary Hydrology Report for the Aura Circle Tentative Map has been
submitted as part of the Review Process for Discretionary Permits.
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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 Aura Circle project include the following:
• An increase in runoff volume
• Reduced infiltration
• Water quality degradation
The development of the Aura Circle project will increase the site runoff by 0.67 cfs.
The increase in flow to the receiving water is negligible and as defined by the
SUS MP, will not negatively impact the dovmstream 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 Aura Circle 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 SWMP.
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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.
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7.1 Site Design BMPs
Site Control B:tvfPs 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 proposed project will consist of a 10 lot detached residential development with an
adjacent open space lot and a supporting cul-de-sac street. Table 1 lists the requirements
for the application of Site Design BMPs. Examples of site design BMPs are cited from
Section III (2)A -Maintain Pre-development Rainfall Runoff Characteristics. The Aura
Circle 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 stonn 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.
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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 III (2)B -Source Control BMPs, which lists the
requirements for the application of Source Control BMPs. The Aura Circle project will
employ the following Source Control BMPs:
• Provide stenciling or labeling of all storm drain inlets and catch basins
with prohibitive language and/or graphical icons to discourage illegal
dumping, to the satisfaction of the City Engineer and as delineated on
Figure 6 of this plan.
• Maintain legibility of stencils and signs
• Use of efficient irrigation systems and landscape design
• Irrigation systems are designed to address specific water requirements
To further reduce the sources of pollutants, the cul-de-sac street shall receive regularly
scheduled sweeping and CC&Rs will specify that outdoor or uncovered storage of
materials is not be 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
requirements for each landscape area have been considered and addressed during the
landscape design process.
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7.3 BMPs for Individual Priority Project Categories
The City of Carlsbad SUSMP 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 III (2)C that are a part of the
proposed development and are addressed in the site design:
• Residential Driveways & Guest Parking
• Hillside Landscaping
The remaining list of Individual Priority Project Categories are contained herein, however
are not applicable to the Aura Circle project:
• Private Roads
• Surface Parking Areas
• Dock Areas
• Maintenance Bays
• Vehicle & Equipment 'i\i'ash Areas
• Outdoor Processing Areas
• Non-retail Fueling Areas
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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 B:MPs. 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 site design and 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 Aura
Circle, the primary pollutants of concern shall receive prio.tity for BMP selection. The
SUSMP provides a Treatment Control BMP Selection Matrix as a reference in
determining the appropriate treatment control BMP(s).
The Aura Circle project employs a combination of vegetated swales (individual lot
landscaping) and a hydrodynamic separator to reduce. the Pollutants of Concern.
The selection of biofiltrating and hydrodynamic treatment BMPs is based upon the
physical constraints typically encountered during hillside development and the pollutant
removal efficiency of the proposed BMPs.
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 incticate that the selected Treatment Control BMP efficiency is equal to or exceeds
the impaired water pollutant priority.
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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 in.filtration practices is
contained in the Environmental Protection Agency Report Number EPA/600/R-94/051,
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 B:MPs 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.
Non-Applicable Restrictions
• All dry weather flows shall be diverted from infiltration devices.
• 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.
• 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
Stonn Water Mitigation Plan
Aura Circle T entafive Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
7.7 Infiltration BMPs -Use and Restrictions (cont.)
Non-Applicable Restrictions (cont.)
• 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.
Storm Water Mitigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc,
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.
Storm Water Mitigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
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 S\VMP 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.
Storm Water Mitigation Plan
Aura Circle Tentative Map. CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
8.1 Maintenance Mechanisms
The SUSMP suggests several mechanisms for providing long-term maintenance. The
Aura Circle 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. The responsibility for operation and maintenance costs would
transfer to the HOA upon transfer of title and notice of termination.
This option was selected from the list of potential maintenance mechanisms because of
the use of a grass-lined swale (landscape areas) and hydrodynamic separator treatment
control BMPs that are an integral part of the site design. Since the BMPs are not separate
from the landscape, but rather are a part of the whole, the Aura Circle project proposes to
assign long-term maintenance-funding responsibility to the ultimate 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.
Stonn Water Mitigation Plan
Aura Circle Tentative Map, CT03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
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 B:MP 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.
Stonn Water Mitigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
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 O & M forms to document all
maintenance requirements. Parties responsible for the O & M plan shalI 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.
Storm Water Mitigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
\
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 Aura
Circle 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.
Stonn Water Mffigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
I
APPENDIX "A"
Storm Water Mitigation Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Bucco la Engineering, Inc.
(
' '
Storm Water Standards
4/03/03
Part B· Determine Standard Permanent Storm Water Reaulrements .
Does the project propose:
.
1. New impervious areas, such as rooftops, roads, parking lots, driveways, paths and
sidewalks?
2. New oervious landscaoe areas and irriaation svstems?
3. Permanent structures within 100 feet of anv natural water bodv?
4. Trash storaae areas?
5. Unuid or solid material loadinn and unloadinn areas?
6. Vehicle or uinment fuelino, washinn, or maintenance areas?
7. Require a General NPDES Permit for Storm Water Discharges Associated with
Industrial Activities (Except construction)?*
8. Commercial or industrial waste handling or storage, excluding typical office or
household waste?
9. Anv oradina or around disturbance durina construction?
10. Anv new storm drains, or alteration to existinn storm drains?
Yes
V
V
V -*To find out if your project is required to obtain an individual General NPDES Permit for Storm Water
No
v' _,..,
...--
V
V
✓
Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site
at, www.swrcb.ca.oov/stormwtr/industrial.html
Section 2. Construction Storm Water BMP Requirements:
If the answer to question 1 of Part C is answered "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Storm Water Pollution Prevention Plan (SWPPP). If the answer to question 1 is "No,"
but the answer to any of the remaining questions is "Yes," your project is subject to
Section IV, "Construction Storm Water BMP Performance Standards," and must prepare
a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No,"
your project is exempt from any construction storm water BMP requirements. lf any of
the answers to the questions in Part C are MYes," complete the construction site
prioritization in Part D, below.
Part C· Determine Construction Phase Storm Water Renuirements
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 Storm Water v'
Discharnes Associated With Construction Aclivities?
2. Does the nroiect nro□ose oradino or soil disturbance? v
3. Would storm water or urban runoff have the potential to contact any portion of the V" construction area, includinn washinn and sta, inn areas?
4. Would the project use any construction materials that could negatively affect water
quality if discharged from the site (such as, paints, solvents, concrete, and v'
stuccOi?
31
Storm Water Standards
4103103
Part 0: Determine Construction Site Priority
In accordance with the Municipal Permit, each construction site with construction storm
water BMP requirements must be designated with a priority: high, medium or low.
This prioritization must be completed with this form, noted on the plans, and included in
the SWPPP or WPCP. Indicate the project's priority in one of the check boxes using the
criteria below, and existing and surrounding conditions of the project, the type of
activities necessary to complete the construction and any other extenuating
circumstances that may pose a threat to water quality. The City reserves the right to
adjust the priority of the projects both before and during construction. [Note:
The construction priority does NOT change construction BMP requirements that apply
to projects; all construction BMP requirements must be identified on a case-by-case
basis. The construction priority does affect the frequency of inspections that will be
conducted by City staff. See Section IV.1 for more details on construction BMP
requirements.]
ua AJ 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
0 BJ 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 (NOls) and SWPPPs are not required.
0 CJ Low Priorffy
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
APPENDIX "B"
Operations & Maintenance Plan
for
Aura Circle
Carlsbad Greens, LLC
1542 Oak Avenue
Carlsbad. California 92008
(760) 434-6645
Prepared by:
Buccola Engineering, Inc.
3142 Vista Way
Suite 301
Oceanside. California 92056
JN 171-1
TABLE OF CONTENTS
Statement of Designated Responsible Party
1.0 Introduction
2.0 Purpose
3.0 Designated Responsible Party
4.0 Permanent Treatment Control (Structural) BMPs
5.0 Operation & Maintenance
5.1 Training
5.2 Inspections
5.3 Maintenance
6.0 Summary and Conclusion
Figures
Figure 1 -Permanent Treatment BMP Location Exhibit
Appendices
Appendix I -Training Records
Appendix II -Routine Maintenance Activities
Appendix Ill -Inspection Checklists
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
Statement of Designated Responsible Party
The undersigned "Designated Responsible Party" accepts responsibility for the
inspection, maintenance, repair and replacement of the "permanent treatment" stonn
water BMP; pursuant to the approved "Storm Water Mitigation Plan for the Aura Circle
development" and in accordance with "Section V-Implementation & Maintenance of
Requirements" of the Standard Urban Storm Water Mitigation Plan.
The undersigned acknowledges that the City has the authority to submit a warning or a
citation should a permanent treatment BMP fall into disrepair as a result of poor
maintenance practices. The undersigned also acknowledges that upon receipt of repeated
warning or citation and with prior written notification, that the "City has the right, but not
the obligation, to perform maintenance" on the permanent treatment BMP.
Therefore, upon prior written notification, the undersigned grants access to the permanent
treatment BMP in favor of the City of Carlsbad, for the purpose of corrective
maintenance to the permanent treatment B:tvfP. In addition, and pursuant to Section
V.4.1 of the City of Carlsbad Standard Urban Storm Water Mitigation Plan, the
undersigned further agrees to reimburse the City for costs incurred as a result of
maintenance to the site permanent treatment BMP.
This Operations & Maintenance Plan does not include a delineated maintenance access
easement, as the permanent treatment BMP is readily accessible within the public Right-
of-Way.
The undersigned also acknowledges that there are significant penalties for submitting
false infom1ation, including the possibility of fine and imprisonment for knowing
violations.
Project Proponent: Joseph A. Gallagher
Signature
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Date
Buccola Engineering, Inc.
1.0 Introduction
The City of Carlsbad is identified as a Municipal Copermittee under Section 1 of the
California Regional Water Quality Control Board, San Diego Region (SDRWQCB),
Order No. 2001-01. As a Copermittee, under Section 10 of the aforementioned order, 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). Moreover, the City of Carlsbad, under
Section D. l of said order, has 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 SDRWQCB Order No. 2001-01, the City of Carlsbad has
prepared and adopted a SUSMP to define Urban Runoff Requirements for Priority New
Development and Redevelopment Projects. The Aura Circle development is a
"discretionary action" project and is therefore subject to the requirements of the SUSMP.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
2.0 Purpose
The purpose of this O & M Plan is to comply with the tenns of the City of Carlsbad -
Standard Urban Storm Water Mitigation Plan (SUSMP) and to provide a set of guidelines
directed toward the implementation of an inspection and maintenance program that will
ensure the intended, long-term function, of the project's "permanent treatment" BMPs.
Section V.4.1 of the SUSMP, states the following:
"The maintenance agreement shall include the following:
1. Operarions & Maintenance (O&M) Plan: The applicant shall include an
Operation & Maintenance (O&M) plan, prepared satisfactory to the City, with
the approved maintenance agreement, which describes the designated
responsible party to manage the storm water BMP(s), employee's training
program and duties, operating schedule, maintenance frequency, routine
service schedule, specific maintenance activities (including maintenance of
storm water conveyance system stamps), copies of resource agency permits,
and any other necessary activities. At a minimum, maintenance agreements
shall require the applicant to provide inspection and servicing of all
permanent treatment BMPs on an annual basis. The project proponent or
City-approved maintenance entity shall complete and maintain O&M forms to
document all maintenance requirements. Parties responsible for the O&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.
2. Access Easement/Agreement: If a permanent RMP requires access for
maintenance, as part of the O&M plan, the applicant shall execute and record
an access easement or agreement that shall be binding on the under lying land
throughout the life of the project in favor of the party responsible for
maintenance, until such time that the permanent treatment BMP requiring
access for maintenance is removed or replaced. The City shall approve any
changes to permanent BMP's, O&M Plans or access agreements. The
agreement shall include a provision that gives the City the right, but not the
obligation to perform the maintenance. The party responsible for BMP
maintenance will pay the City for any and all costs incurred by the City for
maintaining any BMP's. The agreement will provide a cost recovery
provision in favor of the City satisfactory 10 the City Attorney."
Note that the permanent treatment BMP for this project is readily accessible from Aura
Circle and therefore will not require an access easement/agreement for contract or City
crews to gain access to the BMP for maintenance purposes.
The Aura Circle project is also subject to conditions cited in Resolution No. 2003-XXX.
171e conditions relevant to storm water concerns are as follows:
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
2.0 Purpose (cont.)
Note to Plan Checker-citing of COAs will be added to text as they become
available.
(32.) The Developer shall comply with the City's requirements of the National
Pollutant Discharge Elimination S,,vstem (NPDES) permit. Developer shall
provide improvements constructed pursuant to best management practices as
referenced in the "California Storm Water Best Management Practices
Handbook" to reduce su,face pollutants to an acceptable level prior to discharge
to sensitive areas. A Storm Water Management Plan for such improvements shall
be submitted to and subject to the approval of the City Engineer. Said plans shall
include but not be limited to the notifying prospective owners and tenants of the
following:
(A) All owners and tenants shall coordinate efforts to establish or work
with established disposal programs to remove and properly
dispose of toxic and hazardous waste products.
(B) Toxic chemicals or hydrocarbon compounds such as gasoline,
motor oil, antifreeze, solvents, paints, paint thinners, wood
preservatives and other such fluids shall not be discharged into
any street, public or private, or inw storm drain or storm water
conveyance systems. Use and disposal of pesticides, fungicides,
herbicides, insecticides, fertilizers and other such chemical
treatments shall meet Federal, State, County and City
requirements as prescribed in their respective containers.
(C) Best Management Practices shall be used to eliminate or reduce
swface pollutants when planning any changes co the landscaping
and swface improvements.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
3.0 Designated Responsible Party
Section V.4.1 -Operation & Maintenance (O&M) Plan of the SUSMP, states that the
Plan shall describe the "Designated Responsible Party" to manage the storm water BMPs,
employee's training program and duties, operating schedule, maintenance frequency,
routine service schedule, specific maintenance activities (including maintenance of storm
water conveyance system stamps), copies of resource agency permits and any other
necessary activities ... the project proponent or City approved maintenance entity shall
complete and maintain O&M forms to document all maintenance requirements.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
4.0 Permanent Treatment Control (Structural) BMPs
Treatment control (Structural) BMPs are defined in the SUSMP -Appendix I -
Definitions, as "any engineered system designed and constructed to remove pollutants
from urban runoff. Pollutant removal is achieved by simple gravity settling of particulate
pollutants, filtration, biological uptake, media absorption or any other physical,
biological, or chemical process."
Treatment BMPs may be further be categorized as volume or flow-based B.N1Ps. An
example of a flow-based BMP is a grass-lined swale, while a detention pond is an
example of a volume-based BMP. Whether categorized as a volume or a flow-based, the
BMPs are designed to treat the "first flush" of stonn runoff.
The first flush may be described as the runoff, which accumulates on a watershed during
the initial phase of a storm (rainfall) event. The amount of IUllOff is low however, tends
to contain higher concentrations of pollutants.
The Aura Circle development employs the vegetawd swales within each individual lot
and a single, flow-based, hydrodynamic separator BMP to treat the remaining site storm
runoff. The BMP was selected on basis of pollutant removal efficiency, site constraints
and the relative ease of maintenance.
The location of the permanent treatment control BMP is delineated on Figure 1 -
Permanent Treatment BMP Location Exhibit.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
5.0 Operations & Maintenance
For the structural BMPs to
comprehensive O&M Plan.
inspection and maintenance.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
function as designed, it is necessary
Key elements of a sound O&M Plan
to implement a
include training,
Buccola Engineering, \nc.
5.1 Training
It is the responsibility of the Designated Responsible Party (DRP) to obtain Stonn Water
Pollution Prevention related training that addresses inspection, operation and
maintenance of the permanent treatment BMPs.
Storm water pollution control seminars are available to the public, through City, County
and private organizations. For example, the Building Industry Association (BIA) holds
frequent seminars tailored to address specific storm water concerns. Topics generally
covered include National Pollution Discharge Elimination System (NPDES) Regulations,
Best Management Practices, construction and post construction storm water practices.
Upon completion of training the maintenance personnel will have a greater understanding
of the intent, function and maintenance of the permanent treatment BMPs. Training will
enable maintenance personnel to coordinate with the designated responsible party to
verify the effectiveness of maintenance operations performed under the supervision of the
DRP. Training acquired by the DRP shall be such that the DRP is able to train
maintenance personnel that will be under their direct supervision.
Maintenance activities are often subcontracted to outside sources. In the event of such
occurrence, proof of contractor training (DRP) shall be provided to the PP in the form of
a certificate of attendance and/or affidavit, from the contractor (DRP), to that effect.
This manual recommends that the Designated Responsible Party and maintenance
personnel receive training at least once every five years, or as notified by the City of
Carlsbad. Training records shall be maintained for a period ofno less than five (5) years.
Training records may be found in Appendix I.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
I
5.2 Inspections
The inspection component of the O&M Plan serves as a mechanism to proactively
identify existing or potential problems that may impair the intended function of a
permanent treatment BMP. The inspector(s) must assess the condition and effectiveness
of each element of a permanent treatment BMP. The findings of such inspections will
subsequently affect maintenance activities.
Section V.4.1, of the SUSMP, recommends that inspections be performed on an annual
basis. This manual recommends that inspections be conducted in September and May of
each year. This schedule coincides with the "official rainy season" that begins October
1st and ends April 30th of each year. Adoption of this schedule will provide ample time to
perform corrective maintenance to structural BMPs, before and after the rainy season.
All corrective maintenance shall be completed by October 1st, to coincide with the
official beginning of the rainy season. Additional inspections shall be performed after
storm events producing greater than 1" of rainfall as reported by the National Weather
Sen1icc.
11 is the responsibility of the Designated Responsible Party to complete the inspection
checklist by performing field obsen,ations that will determine the condition of the BMP
and to direct the corrective maintenance thereof.
In addition, the inspecting parties shall confirm, by field observation, that all corrective
maintenance directives have been completed in a timely fashion, and in particular, prior
to October 1 si, the official start of the rainy season and shall indicate, by signature, the
satisfactory completion thereof.
Maintenance items that arise but do not appear on the list of routine maintenance
activities shall be categ01ized as Non-routine maintenance operations. A written
description of non-routine activities shall be completed at the bottom of the Inspection
Checklist or as an attachment thereof.
The completed and signed checklist shall constitute an inspection record. Inspection
records shall be maintained for a period of at least 5 years. Inspection records may be
found in Appendix III.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
5.3 Maintenance
Permanent Treatment BMP maintenance may be categorized as routine and non-routine
maintenance operations. Routine maintenance operations are generally preventative
measures that may be described as "good housekeeping" practices, while non-routine
maintenance activities tend to be corrective or replacement measures.
The Aura Circle permanent treatment BMP is hydrodynamic separator, which is an
integral part of the storm drains system and therefore, shall receive regularly scheduled
maintenance (monthly during the "rainy season") and will be integrated with the
landscape maintenance.
Routine maintenance of the permanent treatment BMP will consist of the following:
Hydrodvnamic Separator
• Weed, debris & trash removal
• Maintain clear inflow opening
• Maintain clear outflow opening
• Proper disposal of waste material
Routine maintenance items cited as being separate from permanent treatment BMP
maintenance.
Drivewavs and Interior Sidewalks
• Weed, debris & trash removal
• Sweeping
Landscape and Irrigation
• Weed, debris & trash removal
• Replant/reseed as necessary to maintain coverage
• Check irrigation for function, coverage and overspray
A list of routine maintenance activities is included as part of this Plan and may be found
in Appendix II. The list itemizes specific activities and the frequency thereof. It is the
responsibility of the Designated Responsible Party to provide the maintenance contractor
with the list of routine maintenance activities. The Designated Responsible Party and
Contractor shall sign list of routine maintenance activities as acknowledgement of
receipt. Contractor billing activity shall provide a record of scheduled maintenance
frequency.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, lnc.
5.3 Maintenance (continued)
The results of an inspection may deem that one or more the features of a BMP require
may refitting, rehabilitation or replacement to maintain correct operation. These types of
corrective action are not part of regularly scheduled maintenance and are categorized as
non-routine maintenance activities. Specific examples of non-routine maintenance
activities include:
• Repair or replacement of Hydrodynamic separator unit
• Repair or replacement of inflow/outflow conduits
Non-routine maintenance operations are not specifically itemized on the inspection
checklist and therefore shall appear as an attachment to the Inspection Checklist and may
be found in Appendix III. The completion of corrective maintenance directives are
included as part of the inspection checklist completion. Records shall be maintained for a
period of at least 5 years.
Should the Owner encounter site conditions that require corrective action, which appear
to be beyond his or her level of training or expertise, it is the recommendation of this
manual that the Owner contact the City of Carlsbad, Engineering Department at (760)
602-2720.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
6.0 Summary and Conclusion
This O&M Plan has been prepared in accordance with the City of Carlsbad SUSMP and
is intended to provide the Designated Responsible Party with minimum guidelines to
establish an effective O&M schedule and system for recording such activities.
This Plan recommends that the Designated Responsible Party become familiar with the
approved Storm Water Mitigation Plan (Sm1P) for the subject project. The approved
S\VMP is the basis for the development of this Operation & Maintenance (O&M) Plan.
A copy of the approved SV.lMPIO&M Plan is available for review, at the City of
Carlsbad, Engineering counter. In addition, the Designated Responsible Party has been
provided a copy of the approved report and plan. The Project Proponent should study the
/O&M Plan to develop a greater understanding of the intent, structure and function of the
site BMPs.
This plan also suggests that the Project Proponent refer to the City of Carlsbad Standard
Urban Storm Water Mitigation Plan (SUSMP) for information regarding BMPs,
definitions, general categories of water pollution and additional information resources.
It is possible that as Best Available Technologies (BATs) improve and the Regional
Water Quality Control Board enacts more stringent water quality standards, that the
permanent treatment BMPs may require upgrades or other improvements to improve
pollutant removal efficiency.
The proper and diligent implementation of an effective O&M Plan will help to keep
mamtenance costs in check, insure the proper function of the structural BMPs and protect
water quality to the maximum extent practicable.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
FIGURES
Buccola Engineering, Inc.
Figure 1 -Permanent Treatment BMP Location Exhibit
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
APPENDICES
Buccola Engineering, Inc,
Appendix I -Training Records
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
Insert Training Records Here
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
Appendix II -Routine Maintenance Activities
Operation & Maintenance Plan
Aura Circle Tentative Map, CT 03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
ROUnNE MAINTENANCE ACnvmES FOR O&M OF STRUCTURAL BMPs
Note to the Maintenance Contractor: the following notes define a "Scope of Work" and do not constitute a contract
between the Owner and Maintenance Contractor.
The items contained in this fist of Maintenance Activities shall be performed on the Structural BMPs as part of the
regularly scheduled landscape maintenance.
[he. MQintenance. C.a.ntrnctor shall na.ti/.x th: "Owner" <2.l OQk'. StructJJ.rgj fJ..MP iIJ.odeg_uaci~ rjjscovere.d.. during, the course
Qf regular maint:.nanf.e o~rotions_, The Owner anQ. MQ.inte(lflflce ControctsJ.r shall, .Qy mutual Q~em~l arrange to
oerform co"ective measures to restore proper BMP function.
The Maintenance Contractor shall oversee the completion of non-routine maintenance directives that result from
periodic structural BMP inspection.
lllls. Q.ocument sb.Qll /J.~ r~tain~d fQr fi'{fJ. l:'."fJ.Qa,
THE FOLLOWING STRUCTURAL BMP MAINTENANCE ACTIVITIES SHALL BE PERFORMED AS PART OF ROUTINE LANDSCAPE
MAINTENANCE.·
1 -COLLECT AND REMOVE TRASH & PLANT DEBRIS
2 -REMOVE & DISPOSED OF WffD
J -MAINTAIN CLEAR INLET PIPE OPENING
4 -MAINTAIN CLEAR OUTLET AND OVERFLOW OPENING
5 -CHECK CONDITION OF SOURCE CONTROL BMPs {SIGNAG[ & STENCILING}
6 -CH[CK /RR/GA TION SYSTEM FUNCTION, COVERAGE AND OVERSPRA Y
7 -SWEEP INTERIOR DRIVE AISLES AND FIA/WORK
8 -MINIMIZE FERTILIZER AND PESTICIDE USE
9 -OTHER:
{PRINT & INITIAL}
GENERAL NOTES:
1 -THE CONTRACTOR SHALL REMOVE & DISPOSE OF TRASH, PLANT DEBRIS AND SILT. REFUSE SHALL NOT BE
ALLOWED TO ENTER ANY STORM ORA/NAG[ STRUCTURE.
2 -THE CONTRACTOR SHALL PERIODICALLY OPERATE THE AUTOMATIC IRRIGATION SYSTEM(S) AND MONITOR THE
EFFECTIVENESS THEREOF. SPRINKLERS FOUND TO PLACE WATER OUTSIDE OF LANDSCAPE ARES SHALL BE
ADJUSTED TO ELIMINATE NON-STORM WATER INTRODUCTION OF RUNOFF TO STREETS AND STORM DRAIN.
3 -SIGNATURE OF THIS DOCUMENT ACKNOWLEDGES RECEIPT OF APPENDIX II -ROUTINE MAINTENANCE ACTIVITIES.
S/GNA TURE OF THIS DOCUMENT DOES NOT CONSTITUTE A CONTRACT BETWffN OWNER AND CONTRACTOR.
8/WNG RECORDS OF SCHEDULED MAINTENANCE ACTIVITIES SHALL SERVE AS A RECORD OF SATISFACTORY
COMPlfl/ON OF ROUTINE MAINTENANCE ACTIVITIES FOR THE OPERATION & MAINTENANCE OF STRUCTURAL BMPs.
"OWNER" DATE
PREPARED IN THE OFFICE OF:
BUCCOLA 76()/721-2000 MAINTENANCE CONTRACTOR DATE
AURA CIRCLE -~ PLAN ENGINEERING, znc APPENDIX II
3142 Vista Way, Suite 301, Oceanside, CA 92056 ROUTINE UAJNTENANCE ACTMTIES
Appendix Ill -Inspection Checklists
Operation & Maintenance Plan
Aura Circle Tentative Map, CT03-10
Carlsbad Greens, LLC
Buccola Engineering, Inc.
INSPECnON RECORD -O&M STRUCTURAL BMP /NSPECnON CHECKLIST
Permanent Treatment BMP: Date of Inspection:
Inspected by:
NQ.m, 00 lnsQectioQ. E,g_dJ_: lnwi.ecfians shQll b.e ~erforme.d Qunflg $.eo.temb.er g_nQ. Mai:'. gf eacf:J. I!~ aJJ.d Qtt,~ stQ.rm
events as descnDed in section 6.2 paragraph 2 of this Plan.
The inspector shall determine the condition of the BMP item based upon field observation. Q_heck •ves "it f.t!.e
candtion of {t§.m is OC(;.fl,Df.QQJ.e, Q.heck "m2" il the CQIJ.d/f.Qn '1.l item is u.noc~taQ/e. Determine and record
on appropriate corrective maintenance directive. Record completion dote of maintenance directive.
Maintenance items that are not contained on this checklist ore considered to be "non-routine" 1Cems, as defined
in Section 6.2 of the O&M Pion. Provide a wdtten explanation of all the non-routine maintenance activities in
the space provided on this form. Attach additional pages as necessary.
Retain lam.~,tion RecQCtJ.$. for five ~Qrs.
ITEM/CONDITION YES NO MAINTENANCE DIRECTNE COMP1£71ON DATE
TRASH & PLANT DEBIS REMOVAL
INFLOW LOCAllON
OUTFLOW STRUCTURE
LESS THAN 1 /2 INCH OF SEDIMENT
NON-ROUllNE MAINTENANCE OPERAllONS: {ATTACH ADD!nONAL PAGES AS NECESSARY}
PREPARED IN THE OFFICE OF: SIGNATURE OF INSPECTOR DAT£
BUCCOLA 760/721-2000
AURA CIRCLE -~M PIAN ENGINEERING, znc APPENDIX Ill
3142 Vista Way, Suite 301, Oceanside, CA 92056 INSPECTION CHECKUST