Loading...
HomeMy WebLinkAboutCT 00-02; CALAVERA HILLS PHASE II; WATER QUALITY TECHNICAL REPORT; 2005-09-06{i.~ '" •• a·~··· l " .~ .. ~ WATER QUALITY TECHNICAL REPORT FOR FOX-MILLER CARLSBAD TRACT CT 00-02 Carlsbad, California Job No. 04-1093/5 Prepared: January 2004 Revised: May 5, 2004 Revised: December 1, 2004 Revised: September 1, 2005 PREPARED FOR Fox-Miller 67 Cape Andover Newport Beach, California 92660 (949) 433-4369 O'Day Consultants, Inc. 2710 Loker Avenue West, Suite 100 Carlsbad, CA 92008 Tel: (760) 931-7700 Fax: (760) 931-8680 John P. Stroluninger, Expires 6-30-2006 Date Revised by: BRL ! • • • TABLE OF CONTENTS 1.0 Purpose 2.0 Introduction 3.0 Determination of Applicable Storm Water BMP Requirements 4.0 Site 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 Historical Sources 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 Final 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 Grading Plan for Fox-Miller Property 1 • .' • 10.0 Figures 1 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 Temporary Storm Water BMP Exhibit Tables Table 1 -Priority Project Storm Water BMP Requirements Matrix Table 2 -Anticipated & Potential Pollutants by Land Use Type Table 4 -Structural 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 Water Quality Technical Report Grading Plan for Fox-Miller Property 11 • • .' 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 Fox-Miller site. The discussion will include the identification of the Receiving Waters for each discharge point, the Conditions of Concern (COCs) and the Pollut~ts 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. The City of Carlsbad SUSMP does not, nor will this plan, address sources of storm water and non-storm water pollution that are associated with construction related activities. 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 final engineering phase of this project. Water Quality Technical Report Grading Plan for Fox-Miller Property 1 G:\AcctsI041093IWQTRlwqlr.doc • • '. 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. 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 CW A 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 Carlsbacl, 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 applicable to the Fox-Miller project as defmed under Appendix A, Storm Water Requirements Applicability Checklist. Water Quality Technical Report Grading Plan for Fox-Miller Property 2 G:\AcctsI041093IWQTRlwqlr,doc • • • 3.0 Determination of Applicable Storm Water BMP Requirements The City of Carlsbad SUSMP provides Appendix A, Storm Water Requirements Applicability Checklist, as a mechanism to determine the applicable storm water BMP requirements. The SUSMP requires the completion and inclusion of the checklists contained in Section 1, Parts A, B, C and D. The checklists are designed to provide a standard to define and identify the land use and required BMPs for a Priority Project. The completed appendices may be found at the end of this report. The following SUSMP Appendices have been completed and the fmdings are as follows: Appendix A, Section 1, Part A, Determine Priority Project Permanent Storm Water BMP Requirements; indicates that the proposed project development is defmed as follows: Item 9 Streets, roads, highways and freeways which would create a new paved surface that is 5,000 square feet or greater. Appendix A, Section 1, Part B, Determine Standard Permanent. Storm Water Requirements; 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. Item 10 Any new storm drains, or alteration to existing storm drains. Appendix A, Section 2, Part C, Determine Construction Phase . Storm Water Requirements; indicates that the project will require a SWPPP. Appendix A, Section 2, Part D, Determine Construction Site Priority; indicates that the project will be classified as High Priority Construction Site, as the development contains more than 5 acres . Water Quality Technical Report Grading Plan for Fox-Miller Property 3 G:\Acc!s\041093\WQTR\wqtr,doc • • The City of Carlsbad also contains a series of Tables that provide BMP reqqitements, identification of pollutants, structural BMP selection and removal efficiency. Tables 1,2 and 4 are included in this report. Table 3 provides standard numeric sizing methods and is not included in this report. The tables are included at the end of this report. This report has been compiled without knowledge of the precise development proposed for each lot. Therefore, this report contains storm water treatment guidelines, Which provide the most thorough approach to BMP requirements, targeted pollutants and pollutant removal rates for the rough grading of the project. The following paragraphs summarize the content of each table and the possible application to this project. Table I -Standard Development Project & Priority Project Storm Water BMP Requirements Matrix. A review of the matrix indicates that the development of the Fox- Miller project is, at a minimum, required to incorporate site design, 'source control and treatment control BMPs. The development of each lot is also subject to specific BMPs applicable to Individual Priority Project categories, which include but are not limited to; dock areas, maintenance bays, outdoor processing areas and etc. Table 2 -Anticipated and Potential Pollutants by Land Use Types. The nature of the proposed development indicates that each general pollutant listed in Table 2 may be potentially present and should be anticipated during the selection of BMPs. Table 3 -Structural Treatment Control BMP Selection Matrix, lists the removal efficiencies of treatment BMPs upon targeted pollutants of concern . The completed checklists are contained in Appendix A. The Fox-Miller WQTR addresses the storm water concerns associated with the mass- grading development of the site. Runoff volumes will be determined onsite to msure post construction runoff does not exceed pre-construction runoff. The intent of the present owners is to sell the four developable lots to individual owners. Subsequent development of the individual lots will require the submission of site specific WQTRs for each lot. The individual lot WQTRs shall address site-specific 'Storm water concernS. All 'storm water runoff will be treated prior to leaving the site. In addition, runoff volumes shall be detained onsite to historic flows as indicated in the Hydrology Studies. The lot owner shall also be responsible for the implementation, funding and maintenance of a, storm water maintenance and operations agreement and manual for their specific lot. Water Quality Technical Report Grading Plan for Fox-Miller Property 4 G:lAccts\041093\WQTR\wqlr,doc • • • 4.0 Site Description The Fox-Miller project is located southwest of EI Camino Real, approximately one mile north of Palomar Airport Road (Figure 1). The 54-acre site is moderately vegetated with a mix of shrubs and ground cover. The site topography may be described as moderate, with most of the site containing grades ranging from 14% to 50%. Elevation ranges are between 146 feet Mean Sea Level (MSL) at the mouth of Letterbox Canyon to 310 MSL along the ridges located in the southeast portion of the site. 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 entire site drains west, toward College Boulevard. An existing MS4, located in College Boulevard, conveys storm flows north to Agua Hedionda Creek. ~xisting 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 the mass grading of four building pads, the construction of Salk Avenue and supporting infrastructure. The site has been designed to mimic historic runoff patterns. Storm runoff will be detained to predevelopment volumes. Lots 1-4 will be developed with on-site detention facilities. The developers of each lot will be responsible for design, implementation and maintenance of storm water treatment facilities, on a lot-by-Iot basis. The historic site condition forms two major drainage basins. The proposed development mimics the historic condition by maintaining two major drainage basins and by meeting or reducing storm flow to pre-development volumes. In addition, the proposed condition design directs runoff to historic outfall locations. The drainage volumes at each outfall location are slightly less than that of the historic ~ondition. The decrease in flow is due to onsite detention proposed for each lot. Please see the Hydrology, Hydraulics, and Detention studies for the Fox-Miller Property, dated March 16,2005 by O'Day Consultants. Proposed onsite drainage patterns and facilities are delineated on Figure 5., Water Quality Technical Report Grading Plan for Fox-Miller Property 5 G:\Accts\041093\WQTR\wqtr.doc • • • 5.0 Criteria for Identification of Pollutants of Concern The City of Carlsbad SUSMP mandates that priority projects identify hist0rical 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 Historical Sources of Pollutants From the Project Area A site reconnaissance was performed on January 22, 2004 to examine the present site condition and to identify possible existing sources of pollution and conditions of concern. The site is accessible from El Camino Real andlor the knuckle at Fermi Court. There is a moderate cover of shrubs and grasses. There are signs of significant erosion created by runoff from El Camino Real. There are also small amounts of trash strewn along the El Camino Real R/W. There are no visible concentrations of trash or debris. 5.2 Identification of Receiving Waters The State Water Resources Control Board has adopted a Basin Plan that was initiaily 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 Basil} Planning Areas, Hydrologic Units, Areas and Subareas of the State. In accordance with the early DWR definitions, Hydrol0gic Units are the entire watershed of one or more streams; hydrologic areas are major tributaries andlor 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 CW A 303( d) designation, which mandates the identification of impaired waters within the state and is discussed in Section 5.3 of this report. . The Fox-Miller 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 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 Hydrologic Unit includes the cities of Oceanside, Carlsbad, Leucadia, Encinitas, Cardiff-by-the Sea, Vista and Water Quality Technical Report Grading Plan for Fox-Miller Property 6 G:\Accts\041093\WQTR\wqtr.doc • • • Escondido. The Hydrologic Unit is drained by the following creeks; Buena Vista, Agua Hedionda, San Marcos and Escondido . The Carlsbad Hydrologic Unit contains four major coastal lagoons; Buena Vista, Agua Hedionda, Batiquitos and San Elijo. Agua Hedionda Lagoon is located at the mQuth of Agua Hedionda Creek and is located entirely within 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 power plant cooling water supply. The easterly portion of the lagoon is used for water- oriented recreation. 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 CW A. 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 in July 2003. 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 Fox-Miller project are defined as follows: Agua Hedionda Creek • Region - 9 (San Diego) • Water Body Type "R" -Rivers and Streams • Name -Agua Hedionda Creek • Calwater Watershed -90431000 • Pollutant/Stressor -Total Dissolved Solids • Potential Sources -Urban Runoff/Storm Sewers Unknown Nonpoint Source Unknown Point Source • TMDL Priority -Low • Estimated Size Mfected - 7 Miles • Proposed TMDL Completion -Not AvailablelUnpublished Agua Hedionda Lagoon • Region - 9 (San Diego) • Water Body Type "E" -Estuaries • Name -Agua Hedionda Lagoon Water Quality Technical Report Grading Plan for Fox-Miller Property 7 G:\AccIsI041093IWQTRlwqlr.doc • • • • Calwater Watershed -90431000 • Pollutant/Stressor -Bacteria Indicators • Potential Sources -NonpointiPoint Source • TMDL Priority -Low • Estimated Size Affected -6.8 acres • Proposed TMDL Completion-Not AvailablelUnpublished • Pollutant/Stressor -Sediment/Siltation • Potential Sources -NonpointiPoint Source • TMDL Priority -Low • Estimated Size Affected -6.8 acres • Proposed TMDL Completion -Not AvailablelUnpublished 5.4 Identification of Pollutants of Concern The City of Carlsbad SUSMP states that upon identifying the project's anticipated pollutants (Section III.1.A, Table 2), the receiving waters for each discharge point and the pollutants identified in the 303( d) list, that a comparison be drawn to determine the 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 Fox-Miller project is a commercial development of containing more than 100,00'0 square feet with a supporting street. Table 2 lists the following Potential Pollutants Generated by Land Use Types: Streets, Highways & Freeways • Sediments • Nutrients (if landscaping exists onsite) • Heavy Metals • Organic Compounds (including petroleum hydrocarbons) • Trash & Debris • Oxygen Demanding Substances (including solvents) • Oil & Grease As previously noted in Section 5.3, the 303(d) Impaired Waters, the pollutants/stressors identified as impairing the receiving waters are as follows: Agua Hedionda Creek • Low Priority -Total Dissolved Solids Agua Hedionda Lagoon • Low Priority -Bacteria Indicators • Low Priority -Sediment /Siltation Water Quality Technical Report Grading Plan for Fox-Miller Property 8 G:\Accls\041093\WQTR\wqlr.doc • • • Total Dissolved Solids (TDS) are described as the total amount of minerals, organic matter and nutrients that are dissolved (not suspended) in the water. TDS are generally comprised of inorganic salts such as calcium, magnesium, potassium, sodium, bicarbonates, chlorides and sulfates. However, dissolved solids may include ± ions and heavy metals such as arsenic, cadmium, iron, lead and mercury. An elevated heavy metal constituent in the TDS composite can be detrimental to plant and animal life. . 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. The dictionary defines sediment as any matter deposited by water or wind that settles to the bottom of a liquid. The WQCB defines sediment as soil, sand and minerals washed from land into water. Sediment resulting from human disturbance is considered a pollutant. The WQCB only regulates discharges of sediment from human activities. The WQCB does not regulate naturally occurring sources of sediment. Silt represents the finer particles present in sediment. Siltation is the build-up of sediment/silt which can clog animal habitats, destroy fish nesting areas and cloud waters so that sunlight does not reach aquatic plants . The Identified Pollutants of Concern which will are the target of the Treatment Control BMP(s) are as follows: • Sediment • Nutrients • Heavy Metals • Organic Compounds • Trash & Debris • Oxygen Demanding Substances • Oil & Grease • Bacteria & Viruses • Pesticides Water Quality Technical Report Grading Plan for Fox-Miller Property 9 G:\Accls\041093\WQTR\wqtr,doc •• • • 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 40wnstream channels and habitat". To determine the Conditions of Concern, the SUSMP requires the following steps be followed for each priority project. 6.1 • 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 are 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 Summary Evaluation of the Final Hydrology Study The Tentative Map approval of 2002 conditioned the owners of the property to ensure that ultimate development peak runoff for the property not be increased over the existing peak runoff. The Hydrology, Hydraulics, and Detention Study reports for the Fox-Miller property, done by O'Day Consultants, contain the specifics of the calculations. The placement of detention basins within the lots themselves will take up useable/sellable area, so with the storm drain/detention design, every effort was made to minimize the amount of detention on each lot. Based on the street alignment for Salk, and the proposed grading for the site, it is projected that lots 1-3 will be developed with the detention provisions within the pads/lots themselves. Provisions for pollutant-removal, i.e. grass swales, bio-filtration trenches, etc., can be expected to also provide some detention of runoff by lowering velocities and providing small amounts of storage. The developers of each lot will be responsible for designing and implementing the pollutant-removal features, and also for limiting runoff to amounts noted with this study, pending approval by the City of Carlsbad. Ultimately the individual lot owners or the owners-associ~tion will be responsible for maintenance of detention basins and pollutant-r~moval appurtenances . Water Quality Technical Report Grading Plan for Fox-Miller Property 10 G:lAcctsI041093IWQTRlwqtr.doc • • • The design for lot 4 is slightly different; due to the geometry of the Salk roadway and the lot layout, a detention basin fits well into the triangular area at the bottom of the slope, and will be constructed with the Fox-Miller grading/storm drain plans. 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 Fox-Miller project include the following: • An increase in runoff volume • Reduced infiltration • Water quality degradation 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 Fox-Miller 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. Water Quality Technical Report Grading Plan for Fox-Miffer Property 11 G;\Accls\041093\WQTR\wqlr.doc • • • 7.0 Establishing Storm Water Best Management Practices (BMPs) The SUSMP dictates that all priority projects shall implement storm water }3MPs 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 BM!> . Requirements Matrix" specifies the application of Site Design, Source Control and Treatment Control BMPs based upon land use. 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 "attempt to mimic" the natural hydrology. The Fox-Miller project will employ the following Site Design BMPs: Minimize impervious area • Incorporate landscape buffer areas. • Streets designed with minimal pavement width. Increase Rainfall Infiltration • Direct runoff to pervious (landscape) areas. Maximize Rainfall Interception • Maximized canopy interception by retention and planting of trees and large shrubs. Minimize Directly Connected Impervious Areas (DCIAs) • Draining runoff into adjacent landscaph;l.g prior to discharging to the storm drain. Slope protection • Planting and irrigating slope groundcover and canopy • Energy dissipation devices, stabilized outfalls, high-flow·bypasses, stream bank stabilization, and other structural controls necessary to prevent channel erosion. The Pads will be designed to maintain pre-development runoff characteristics. Drive aisle widths will be minimized. Lot landscaping will provide filtration for lot runoff. Runoff from slopes will be conveyed across vegetated areas to minimize the possibility of introducing silt to the runoff. All storm runoff from the individual lots shall receive treatment from a structural BMP prior to leaving the lot and entering an MS4 . Water Quality Technical Report Grading Plan for Fox-Miller Property 12 G;\Accts\041093\WQTR\wqtr.doc • • • 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 Fox-Miller project will employ the following Source Control BMPs: • Post signs and prohibitive language that prohibits illegal dumping at public access points. • Installation of water efficient irrigation devices within the development • Maintain legibility of stencils and signs. • Use of efficient irrigation systems and landscape design. • Irrigation systems are designed to address specific water requirements. • Remove all vegetative waste and dispose of by compo sting in an appropriate location, by recycling in an approved facility, and/or by disposal in a landfill. • Inspect landscape irrigation as part of the regular maintenance activity. Check the operation of sprinkler heads/lines for coverage, creation of erosion and as a source of non-storm water runoff. • Paved areas shall receive regularly scheduled sweeping. • All curb inlets located along Salk Avenue shall be equipped with inl~t filters, as approved by the city of Carlsbad. The landscape plan is designed to retain and enhance canopy interception by providing a generous number of and a 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. 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 list of Individual Priority Project Categories are contained herein, however are not applicable to the Fox-Miller project: • Surface Parking Areas • Private Roads • Residential Driveways & Guest Parking • Dock Areas • Maintenance Bays • Vehicle & Equipment Wash Areas Water Quality Technical Report Grading Plan for Fox-Miller Property 13 G:\AcctsI041093IWQTRlwqlr.doc • • • • Outdoor Processing Areas • Non-retail Fueling Areas • Hillside Landscaping 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 Fox-Miller, 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 individual lots contained within the Fox-Miller project will employ a combination of vegetated areas and structural treatment BMPs to perform biofiltration and reduce the Pollutants of Concern. Table 4 -Structural Treatmtent Control BMP Selection Matrix lists the pollutants gf concern, the Treatment BMPs available and the efficiencies thereof. Each lot owner will propose an onsite BMP or combination thereof to treat the target pollutant(s). The selected Treatment Control BMP efficiency shall be equal to or exceeds the impaired water pollutant priority. 7.5 Numeric Sizing Design The SUSMP provides criteria for the Numeric Sizing Design of treatment control aMPs. The sizing of treatment control BMPs may be based upon flow or volume calculations. Table 3 -Numeric Sizing Treatment Standards of the SUSMP, provides two methods for calculating minimum BMP flow or volume quantities. 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. Water Quality Technical Report Grading Plan for Fox-Miller Property 14 G:lAcctsI041093IWQTRlwqtr.doc • • • The locations of the treatment control BMPs for the mass-grading phase of the Fox- Miller project are delineated on Figure 6 of this report. 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 gra~sy 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 EPAl600IR-941051, Potential Groundwater Contamination from Intentional and Nonintentional Stormwater Infiltration, USEP A (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 Fox-Miller project will comply With this restriction by use of efficient irrigation systems and landscape design, and by sweeping driveways and parking areas. • Pollution prevention and source control BMPs shall be impl~mented 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 Fox-Miller site contains landscape areas that provide filtration N on-Applicable Restrictions • Urban runoff from commercial developments Water Quality Technical Report Grading Plan for Fox-Miller Property 15 G:lAccts\041093\WQTR\wqlr.doc • • • 7.6 • Vertical distance from the base of an infiltration device the season~ 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 inflltration 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. 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 Grading Plan for Fox-Miller Property 16 G:lAccts\041093\WQTR\wqtr.doc • • • 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 Fox-Miller 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 mechamsms 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 Fox-Miller 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 BMJ> 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 mini~terial 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 Grading Plan for Fox-Miller Property 17 G:\Accts\041093\WQTR\wqtr.doc • • • 8.3 Maintenance Requirements Operation & Maintenance (0 & M) Plan -The City requires that a copy of an Operat~on & 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 . Water Quality Technical Report Grading Plan for Fox-Miller Property 18 G:lAccts\041093\WQTR\wqtr.doc • • 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 Fox- Miller 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 Grading Plan for Fox-Miller Property 19 G:\AcctsI041093IWQTRlwqtr.doc • • • 10.0 Figures 1 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 Temporary Storm Water BMP Exhibit Water Quality Technical Report Grading Plan for Fox-Miller Property 20 G:lAccts\041093\WQTR\wqtr.doc CITY OF OCEANSIDE ~ PACIFIC () OCEAN ~ ~ cP 1:) 78 ©2004 0'00 Consultants Inc. CITY OF VISTA ........ CITY -OF ENCINITAS NOT TO SCALE FOX-MILLER WA7FR QUALITY TECHNICAL REPORT FIGURE l' VlCINffY MAP' · FOX-MILLER WA~ QUALITY TECHNICAL REPORT FIGURE 2 NOT TO SCALE uSGS LOCATION MAP ©2004 O'Do Co It t I nsu an s nco ( SOURCE: COUNTY OF SAN DIEGO, DRAFT 6/27/01 © 2004 O'Da Consultants I nco FOX-MILLER WATER QUAI.ITY TECHNICAL REPORT FIGURE 3 85th P£RCENfILE PR£CIPffATlON ISOPLlJVIAL MAP • • • Tables Table 1 -Priority Project Storm Water BMP Requirements Matrix Table 2 -Anticipated & Potential Pollutants by Land Use. Type Table 4 -Structural Treatment Control BMP Selection Matrix Water Quality Technical Report Grading Plan for Fox-Miller Property 21 G:\Accts\041093\WQTR\wqtr.doc Table 1. Standard Development Project & Priority Storm Water 8MP Matrix Site Desig1~ 8mps I Standard Projects R Priority Projects: Detached Residential R Development DntlOf' S = anti or more appiricati/tl (1) Refer to Section /l1.2.A. (2) Refer to Section /11.2.8. 8MPs Applicable to Individual Priority Project Categories(J) old ~ ! ~ ~ ig ~ .~ ~ ~ i .~ ~ ~ 1 ~ 91 8-{I ~~ "I; ~ ~ <.> ti ·s ~ ~ "5i = e ~ {I ~ t;~ IS i CC ~ ~ IS ~~ ~ ~ ..... .!! jl; ~ -8 ~ .~ ~ ~ ~ .... :B ~ (/) 'Il ·s ~ ~ q; ~ Source d: ~~ cS ~ ::s:: ~ tl! ~ ~:;/:s%) ti ~ () ~ .; ~ ~ ....: . ..: ..... R 0 0 0 0 0 0 0 0 0 0 0 R R R R S staff. As ~prol!nQte. apP'licants are encouraged to incof{!orate treatment individU~" • nority projeCt categories into the project design. City staff where a/cable. . appropria e treatment control SUPs from Appendix C. (3) Priority project categories must apply specific storm water SMP requirements, where applicable. Prio.rity projects are subject to the requirements of all prioirity project categories that apply. (4) Refer to Section 111.2.0. (5) Applies if the paved area tolals >5,000 square feet or with > 15 parking spaces and is potentially exposed to urban runoff. Source: City of Carlsbad SUSMP o INDICATES PROJECT CATEGORY _ IDENT/RED AS POSSIBLE. APPLICABLE BMP FOR PRIORITY PROJECT CATEGORY ©2004 O'Da Consultants, Inc. FOX-MILLER WATER QUALITY TECHNICAL REPORT TABLE 1 STORM WATER 8MP REQUlREMENrS MATRIX Table 2. Project Categories Detached Residential Attached Residential Development Automotive Repair ... '" and Potential Pollutants by Land Use Types Trash &- Sediments Nutrients Debris X X X X X X x x x x x Oxygen Oil Bacteria Demanding &-Ii" Substances Grease W"roses X X X p(l) p(2) pO) x X X • ,: &'!III! ---iiii --iiiii II Streets, Highways ct Freeways X = Anticipated P == Potential 1. A potential poVutant if landscaping exits on-site. 2. A potential pollutant if the project includes uncovered parking areas. 3. A potential poVutant if land use involves food or animal waste products. 4. Including petro/eum hydrocarbons. 5. Including solvents. Source: City of Carlsbad SUSMP D INDICATES PROJECT CATEGORY Pesticides X X X - IDENT/RED AS AN ANTICIPATED/POTENTIAL POLLUTANT BY PROJECT CATEGORY ©2004 0' Consultants Inc. FOX-MILLER WATER QUALITY TECHNICAL REPORT TABLE,2 POLLUTANTS BY LAND USE TYPE Table 4. Structural Treatment Control BMP Selection Matrix. Pollutant of Cancem Treatment Centrol BMP Categories Biofillers Detention Infilfration Wet Ponds Drainage Filtration Hydrodynamic Basins Basins(1) or Wetlands Inserts Separator Systems(2) Sediment M H H H L H M .. Nutrients L M M M L M L Heavy Aletals AI AI AI H L H L Organic Compounds U U U U L M L Trash ct Debris L H U U II H M Oxygen Demanding L AI M M L II L Substances Bacteria U U H U L II L Oil !e Grease M II U U L H L Pesticides U U U U L U L . (1) Including trenches and porous pavement. (2) Also known as hydrodynamic devices and baffle boxes. L: Low removal efficiency' AI: Medium removal efficiency H: High removal efficiency U: Unknown removal efficiency Sources: Guidance S~irtg Management Meosures for So~rr:es of Na,,!:int Pollution in Coostal Waters (199J), Notional Starmwater Bes anagement Practices Dotabase '2001) and ide far 8MP Selection in Urban Developed Areas (2001). City of Carlsbaa SUS AlP. . D /DENT/RED AS A POLLUTANT OF CONCERN _ POSSIBLE STRUCTURAL TREATMENT CONTROL BMP & REMOVAL EFFICIENCY ©2004 O'Oa Consultants Inc. FOX-MILLER WATER OUALITY TECHNICAL REPORT TABLE 4 TREATMENT CONTROL 8MP 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 W~ter Requirements Part C: Determine Construction Phase Storm Water Requirements Part D: Determine Construction Site Priority Water Quality Technical Report Grading Plan for Fox-Miller Property 22 G:\Accts\041093\WQTR\wqtr.doc Storm Water Standards 4/03/03 APPENDIX A STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST Complete Sections 1 and 2 of the fol/owing 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. Sectioo 1. Permanent Storm Water BMP Requirements: If any answers to Part A are answered "Yes," your project is subject to the "Priority Project Permanent Storm Water BMP Requirements," and "Standard Permanent Storm Water BMP Requirements" in Section /II, "Permanent Storm Water BMP Selection Procedure" in the Storm Water Standards manual. If all al'1swers to Part A are "No," and any answers to Part B are "Yes," yOur project is only su.bject 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. P rtA D t t St W t BMP R p' 't P . t P a . e ermine rlOrlt~ rOJec ermanen orm a er equlrements. •. Does the project meet the definition of one or more of the priority project categories?* Yes No 1. Det~ched residential development of 10 or more units V 2. Attached residential development of 10 or more units v 3. Commercial development greater than 100,000 square feet v 4. Autpmotive repair shop V 5. Restaurant V- 6. Steep hillside development greater than 5,000 square feet v 7. Project discharging to receiving waters within Environmentally Sensitive Areas v 8. Parking lots greater than or equal to 5,000 ft~ or with at least 15 parking spaces, and V : potentially exposed to urban runoff 9. Streets, roads, highways, and freeways which would create a new paved surface that is V 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 priority projects. Parking lots, buildings and other structures associated with utility projects are priority projects if one or more of the criteria in Part A is met. Wall answers to Part A are "No", continue to Part B .. 30 Storm Water Standards 4/03/03 Part B: Determme St~ndard Permanent Storm Water Requ rements. Does the project propose: Yes No 1. New impervious areas, such as rooftops, roads, parking lots, driveways, paths and sidewalks? 2. New pervious landscape areas and irrigation systems? 3. Permanent structures within 100 feet of.any natural water body? 4. Trash storage areas? 5. Liauid or solid material loading and unloading areas? 6." Vehicle or equipment fueling, washing, or maintenance areas? 7. Require a ~eneral NPDES Permit fOF Storm Water Discharges Associated with . . . . Industrial Activities· (Except construction)?*·· ... . . .. '.. . < . . •••.. • •.• 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? . 9.. Any grading or ground disturbance during construction? ..... 10. Anv new storm drains, or alteration·to existing storm drains? ....... *To 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.aov/stormwtrlindustrial.html Section 2. Construction Storm Water 8MP Requirements: If the· answer to questioh 1 of Part C is answered "Yes," your project is subject ""to Section IV, "Construction Storm Water 8MP Performance Standards," alid 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 IIYes," your project is subject to Section IV, "Construction Storm Water BMP Performance Standards;" a·nd must prepare .. a Water Pollution Control Plan (WPCP). If every question in Part C Is answered "No," your project is exempt from any construction storm water BMP requirements; If any. of the answers to the questions in Part C are "Yes," complete the construction site prioritization in Part 0, below. . eDt C W t R t Ph s Part . e erm ne onstructlon ase torm a er equ remen s. .. Would the project meet any of these c~iteria during construction? Yes No 1.· Is the project subject to ·California's statewide General NPDES Permit for Storm Water· .,. Discharges Associated With Construction Activities? 2. Does the project propose grading or· soil disturbance? ...... 3. Would storm water or urban runoff have the potential to contact any port jon of the "'" construction area, including washing and staging 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 ....... stucco)? . . .. . Storm Water Standards 4/03/03 Part 0: Determine Construction Site Priority In accordance with the Municipal Permit, each construction site with constrLlction storm water 8MP 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 constructioJ:1. 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 doe.s NOT change construction 8MP requirements that apply .... to projects; a/l construction 8MP. requirements ,must be. identified. of'! )~. c?l~~:H~y-:cas~ . 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 8MP requirements.} ~ A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy sea~on . 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 o B) Medium Priority 1) Capital Improvement Projects where grading .occurs, however a Storm Water Pollution Preve~tion Plan (SWPPP) is not required under the State General Construction Pern:tit (i.e., water a~d sewer replacement projects, intersebtion 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, sup.stantial retaining walls, curb and gutter. for an '. entire street frontage, etc. , howev~r SWPPPs are n·ot.required. . . . 3) Permit projects on private property where grading permits are required, however, Notice Of Intents (NOls) and SWPPPs are not required. o C) Low Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 2) Permit projects in the public right-of-way where minimal to no grading occurs, such as pedestrian ramps, driveway additions, small retaining walls, etc. 3) Permit projects on private property where grading permits are not required, such as small retaining walls, single-family -homes, small tenant improvements, etc. ©2004 a'Da Consultants, Inc. Q =37.74 TC = 8.87 MIN. A = 14.25 AC i "'ophlllt ,,">~~ ." &.:1' O~ " FIGURE 5 WATER QUALITY TECHNICAL REPORT PROPOSED SITE DEVELOPMENT AND DRAINAGE PATTERN EXHIBIT FOR FOX-MILLER PROPERTY LEGEND BASIN AREA IN ACRES. ................................................... (Q;V EXISTING STORM ORAIN................................................... Cl PROPOSED STORM DRAIN................................................ Iil PROPOSED ORAINAGE BASIN BOUNOARY. ........................... .. NODE NO. OESIGNA TleN. ................................................. 200 • q., OES/GN flOW IN CUBIC n: SEC. .................................. 9.8 CFS TIME OF CONCENTRA mOl{ IN MINUTES. ................................ TC = 15.0 MIN 0' 25' M! 100' 50' SCALE: 1" = 100' 200' 18, 200J 2710 Loker Ave West SUite 100 Carlsbad, California 92008 760-931-7700 Fox. 760-931-8680 www.odoyconsultants.com Civil Engineering Planning Processmg Surveying G \041093\0493Z16~FIG5 dW9 Sep 01. 2005 314pm Xre1" 0493UTL; 0493TP01. 0493GRD. 0493MAP; 0493STR "". ©2004 O'Da Consultants, Inc. / / r , FIGURE 4 WATER QUALITY TECHNICAL REPORT EXISTING SITE CONDITION AND DRAINAGE PATTERN EXHIBIT FOR FOX-MILLER PROPERTY LEGEND BASIN AREA IN ACRES. • • • . . . • • • • • . • • • • • . . • (ff;ff) EXISTING STORM DRAIN. • • • • • . . . . • • . • . • • • • • • PROPOSED MAJOR BASIN BOl/NOARY. • . . . . • • • • • . • NODE Na OfSlGNA TlON. •.•...•••.••.•..•• 200 • 0",. DESIGN FLOW IN CUBIC FT. SEC.. . • • • • . . . • • • • • 9. 8 CFS TIME OF CONCENlRATlON IN MINUTES. ••••..••••••• TC = 15.0 MIN 0' 25' 100' W-' 50' 200' SCALE: 1" ~ 100' REVISED: SEPTEMBER, ~ 2005 REVISED: MA Y 4, 20tH- PREPARED: DECEMBER 18, 2003 2710 Loker Ave West Suite 100 Carlsbad. California 92008 760-931-7700 Fax: 760-931-8680 www.odoyconsullonts.com Civil Engineering Planning Processing Surveying G: \jobs\2002\041093\0493Z18-FIG4.dwg 05/06/2004 04:10: 46 PM PDT XREFS 0493MAP, 04931P01; 0+93UlL \\. '\,\~ ....... ---/ ---._---------,/ I < ------ l < " > ~ '" if " ~lJJtHiJlI" " I • " , j ©2004 O'Day Consultants, Inc, FIGURE 6 WATER QUALITY TECHNICAL REPORT STORM WATER BMP EXHIBIT FOR FOX-MILLER PROPERTY LEGEND DIRECTION OF SHEET FLOW-----IIIIIIII •• S~TFFNCE---------------------~,--,--,-­ GRAVEl BAGS-----------~ "" STABILIZED CONSTRUCTION ENTRANCE---gm SLOPE PROTECTION ------- NOTES 1. MAINTENANCE PERSONNEL SHALL RECEIVE TRAINING REGARDING THE INTENr. IMPLEMENT A TlON AND MAINTENANCE OF BMPs. 2. ALL CURB INLETS LOCATED ALONG SALK AVENUE SHALL BE EQUIPPED WITH INLET RLTER5, AS APPROVED BY THE CfTY OF CARLSBAD. 3. 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 uRAIN. 4. PLANT MATERIAL SHALL BE MAINTAINED OR REPLACED AS NECESSARY TO PROVIDE ADEQUATE GROUND COVER AND SILT CONTAINMENT. 5. PAVED AREAS SHALL RECEIVE REGULARLY SCHEDULED SWEEPING. 6. THE ARCHITECT SHALL DESIGN ROOF-DRAIN DOWNSPOUTS IN LOCATIONS THAT ALLOW FOR now ACROSS LANDSCAPE AREAS PRIOR TO ENTERING THE PRNATE DRAIN SYSTEM. 7. PLANTING AND IRRIGATION SPECIRCATIONS PER LANDSCAPE PLAN. 0' 25' 100' ---- -50' 200' SCAlE: 1" = 100' DESIGNED BY: T.T.C. OATE: MAY. 2004 f.?~s DRAWN BY: JDD SCALE: AS SHOWN PROJECT MGR.· J,P.S, JOB NO.: 041093 2710 Loker Avenue West Civil Engineering ENGINEER OF WORK: Suite 100 Planning Corlsbad. California 92008 Processing 760-931-7700 Surveying Fox:7S0-931-868D DATE: JOHN p, STROHMINGER RCE: 55187 G:\jobs\2002\041093\0493Z17-FIG6.dwg 05/06/2004 04:02:48 PM PDT XREfS: 0493STR: 0493MAP: 0493TP01: 0493Ull; 0493GRD