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HomeMy WebLinkAboutPD 08-08; INVITROGEN; STORM WATER MANAGEMENT PLAN; 2008-07-16STORM WATER MANAGEMENT PLAN FOR INVITROGEN Job Number 15767-A Dennis C. Bowling, M.S. R.C.E. #32838 Exp. 06/10 Prepared For: Invitrogen (Owner) 1600 Faraday Avenue Carlsbad, California 92008 Prepared By:. Rick Engineering Company Water Resources Division 5620 Friars Road San Diego, California 92110-2596 (619) 291-0707 July 16, 2008 TABLE OF CONTENTS 1.0 Introduction ...................................................................................................................................... 1 2.0 Vicinity Map...................................................................................................................................3 3.0 Identification of Pollutants and Conditions of Concern .............. . ................................................... 4 4.0 Permanent Storm Water Best Management Practices (BMPs) ................ ......................................... 9 5.0 Maintànance Conditions ................................................................................................................23 6.0 Summary.......................................................................................................................................28 Tables: Table 2: Anticipated and Potential Pollutants Generated by Land Use Type ........................................ 5 Table 4: Treatment Control BMP Selection Matrix ...........................................................................14 Table 4.1: Pollutants and Associated Particle Sizes ...........................................................................15 Table 5: Summary Table of Inspectiori and Maintenance Frequency ................................................21 Appendices: Appendix A Development Application Storm Water Standards Questionnaire Appendix B: Invitrogen Hydrologic Location Map Appendix C: Treatment Flow Rate Calculations Appendix D: Details for Hydrodynamic Devices & High Rate Media Filters Appendix E: Operation and Maintenance (0 & M) Plan May Pockets: Map Pocket 1: Storm Water Management Plan Exhibit for Invitrogen Map Pocket 2: Drainage Study Map for Invitrogen Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 1.0 INTRODUCTION This Storm Water Management Plan (SWMP) summarizes the post-construction storm water requirements for the Invitrogen project. The project is located in the City of Carlsbad just north of Faraday Ave and west of College Boulevard. Please see the Vicinity Map in Section 2.0 for the location of the project. The project proposes to create a parking lot on a small portion of the Invitrogen campus that is currently a mass graded pad. The majority of existing drainage boundaries and flow patterns will not change. The changes .that are taking place are all contained on-site, and as a result the same areas are tributary to the same storm drain systems as in the pre-project condition. In both the .pre-project and post-project condition, storm water runoff from the parking lot portion of the project site is conveyed across the site in a northerly direction before being tied into an existing storm drain system. This existing stormdrain system conveys the flows northerly along College Blvd before outletting into Agua Hedionda Creek and ultimately into Agua Hedionda Lagoon. There is also a portion of the Invitrogen property that drains westerly along Faraday Ave, outlets into an unnamed tributary that ultimately discharges into Agua Hedionda Lagoon. The purpose of this SWMP is to address the water quality impacts from the project. Best Management Practices (BMPs) will be utilized to provide a long-term solution to water quality at the project site. The SWMP is also intended to ensure the effectiveness of the BMPs through proper maintenance that is based on long-term fiscal planning. For the purposes of post- construction storm water quality management, the project will follow the guidelines and requirements set forth in the City of Carlsbad's "Standard Urban Storm Water Mitigation Plan," adopted March, 2008 (herein "SUSMP"). Based on the National Pollutant Discharge Elimination System (NPDES) Project Applicability Form, the project is a "Priority Project." The following Priority Development Project category applies to the Invitrogen project: Parking Lots, which would create a new paved surface that is Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 1 7-16-08 5,000 square feet of greater. A copy of the NPDES Project Applicability Form for the project is located in Appendix A of this SWMP. Please refer to the exhibit titled, "Storm Water Management Plan Exhibit* for Invitrogen" located in Map Pocket 1 of this report for the locations of the drainage facilities and permanent storm water BMPs. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resourcós Division 2 7.16-08 TA OF I OF 2.0 VICINITY MAP bill yr JAZ. VICINITY MAP NOT TO SCALE Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 3 7-16-08 3.0 IDENTIFY POLLUTANTS* & CONDITIONS OF CONCERN Section 2.3 of the City of Carlsbad's SUSMP outlines the procedure for the selection of permanent storm water BMPs. The procedure begins with identification of pollutants and conditions of concern, a three-step process described in Section 2.3.2 of the SUSMP. This section of the SWIvIP addresses each step from Section 2.3.2 to identify pollutants and conditions of concern. 3.1.a Identify Pollutants from the Project Area Table 2 of the SUSMP, "Anticipated and Potential Pollutants Generated by Land Use Type" identifies general pollutant categories that are either anticipated or potential pollutants for general project categories. The project proposes parking improvements, therefore, the "Parking Lots" category shall be used to describe the anticipated or potential pollutants for the project. Table 2 is reproduced on the following page, with the Priority Development Project categories applicable to the Invitrogen project highlighted. Prepared By: DCB:TJ:kc/Reportl15767-A.001 Rick Engineering Company - Water Resources Division 4 7-16-08 Table 2. Anticipated and Potential Pollutants Generated by Land Use Type General Pollutant Priority Trash Oxygen Bacteria Project Heavy Organic & Demanding Oil & & Categories Sediments Nutrients Metals Compounds Debris Substances Grease Viruses Pesticides Detached Residential X X X X X X X Development Attached Residential' x x x p(2) p) x Development Commercial Development p) p(2) x p(S) x. p(3) p(S) > 100,000 ft2 Heavy Industry /Industrial X X X X X X Development Automotive x x(4X5) x x Repair Shops Restaurants S X X X X Steep Hillside Development >5,000 ft2. Parking Lots p) p(') x x p) x p) Retail Gasoline X X X X X Outlets Streets, Highways & x p) x x 4 x p(S) x Freeways X = anticipated Ppotntial A potential pollutant if landscaping exists on-site. A potential pollutant if the project includes uncovered parking areas. A potential pollutant if land use involves food or animal waste products. Including petroleum hydrocarbons. Including solvents. Source: Standard Urban Storm Wafer Mitigation Plan, 2008. Based on the highlighted rows, the anticipated p ilutants from the project include heavy metals, trash & debris, and oil and grease. The potential pollutants include sediments, nutrients, oxygen demanding substances, and pesticides. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company — Water Resources Division 5 7-16-08 3.1.b Identify Pollutants of Concern in Receiving Waters Based on Section 2.3.2.2 of the SUSMP, to identify pollutants of concern in receiving waters, the• following analysis shall be conducted and reported in the project's SWMP: (1) for each of the proposed project discharge points, identify the receiving water(s), ihcluding hydrologic unit basin number(s), as identified in the most recent version of the "Water Quality Control Plan for the San Diego Basin," prepared by the SDRWQCB; and (2) identify any receiving waters, into• which the developed area would discharge to, included in the "2006 CWA Section 303(d) List of Water Quality Limited Segments" approved by the SWRCB on October 25, 2006. List any and all pollutants for which the receiving waters are impaired. Identification of Receiving Waters According to the "Water Quality Control Plan for the San Diego Basin," dated September 8, 1994, prepared by the SDRWQCB, the Invitrógen project is located in the following hydrologic unit basin: Los Monos Subarea in the Agua 'Hedionda Hydrologic Area within the Carlsbad Hydrologic Unit. The corresponding hydrologic unit basin number designation is 904.31 (Region '9', Hydrologic Unit '09', Hydrologic Area '3', and Hydrologic Subarea '1'). An exhibit has been provided in Appendix B of thi's report titled, "Invitrogen Hydrologic Location Map" which shows the project location within Hydrologic Unit 904.31. According to a 'review of asbuilt plans for the downstream storm drain system, the downstream system ultimately discharges into Agua Hedionda Creek prior to its outlet into Agua Hedionda Lagoon. Identification of Receiving Water Impairments On October 25, 2006, the SWRCB adopted the "2006 CWA Section 303(d) List of Water Quality Limited Segments" (2006 303(d) List). The receiving waters for Invitrogen project that are currently listed as impaired based on the 2006 303(d) List include: Agua Hedionda Creek and Agua Hedionda Lagoon. The pollutants/stressors causing impairments are manganese, selenium, sulfates, total dissolved solids, indicator bacteria, and sedimentation/siltation. Due to its associated priority project category, it is not anticipated that the project will be discharging any Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 6 7-16-08 bacteria/viruses, sediments, or nutrients, so heavy metals is the only primary pollutant of concern. Since Landscaping will exist on-site, sediments and nutrients remain a potential pollutant of concern as well. In both the pre-project and post-project condition, storm water runoff from the parking lot portion of the project site is conveyed northerly by College Blvd. All storm water runoff from this area will ultimately discharge into Agua Hedionda Creek then Agua Hedionda Lagoon, which connects to the Pacific Ocean to the west. Storm water from the remainder of the site discharges into an unnamed tributary before outfalling into Agua Hedionda Lagoon, which connects to the Pacific Ocean. The pollutant heavy metals is a primary pollutant of concern because it falls under both an anticipated pollutant generated by parking lots and because it is has been identified as a pollutant causing impairment to a 303(d) listed water body that the project is directly discharging to. 3.1.c Identify Conditions of Concern in Receiving Waters Conditions of concern for the project are related to any relevant hydrologic and environmental factors that are to be protected specific to the project area's watershed. A change to a Priority Development Project site's hydrologic regime would be considered a condition of concern if the change would impact downstream channels and habitat integrity. Potential impacts to downstream channels and habitat are evaluated and addressed in this section of the SWMP. The following discussion summarizes the factors that were evaluated and design measures that were incorporated to mitigate impacts to downstream channels and habitat. Drainage patterns for the pre-project and post-project conditions are essentially the same. In order to mitigate for the increases in peak flows due to paving the area that was permeable in the pre-project condition, an underground detention system is proposed. This detention system will detain 2, 10, and 100 year flows fràm the northern portion of the parking lot so when it confluences with the remainder of the parking lot, the flows are at pre-project levels. Prepared By: DCB:TJ:kclRep0rt/15767-A.00I Rick Engineering Company - Water Resources Division 7 7-16-08 For additional information, refer to the drainage study titled, "Drainage Study for Invitrogen," and dated July 16, 2008, was prepared by Rick Engineering Company (Rick Engineering Company Job Number 15767-A). In regards to water quality impacts to downstream water bodies, the development of the project site will provide permanent storm water BMPs that are expected to treat all anticipated pollutants to the maximum extent practicable prior to leaving the project site. The following section of this SWMP, Section 4.0, will discuss the permanent storm water BMPs proposed for the project. Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 8 7-16-08 4.0 ESTABLISH STORM WATER BEST MANAGEMENT PRACTICES (BMPs) The following discussion addresses requirements of Section 2.3.3 of the SUSMP, to establish permanent BMPs. As listed in Section 2.3.3 of the SUSMP, projects subject to Priority Development Project requirements, at minimum, must implement low impact development (LID) site design .BMPs and source control BMPs. Projects subject to Priority Development Project requirements must also implement the BMPs applicable to Individual Priority Development Project categories (listed in Sections 2.3.3.3 of the SUSMP) and structural treatment control BMPs (discussed in Section 2.3.3.4 of the SUSMP). Alternative storm water BMPs not identified in Table 4 may be approved at the discretion of the City of Carlsbad, provided the alternative BMP is as effective in removal of pollutants of concern as other feasible BMPs listed in Table 4. The following sections 4.2.a through 4.2.c of this SWIvIP will discuss the permanent storm water BMPs proposed for the project. 4.2.a Low Impact Development (LID) and Site Design BMPs The term "Low Impact Development (LID)" means a storm water management and land development strategy that emphasizes conservation and the use of on-site natural features integrated with engineered, small-scale hydrologic controls to more closely reflect pre- development hydrologic features. "Site design BMP" known as a significant part of Low Impact Development (LID), means any project design feature that reduces the amount of impervious surfaces, disconnects impervious surfaces, reduces creation or severity of potential pollutant sources and/or reduces the alteration of the project site's natural flow regime. The geotechnical engineer has identified the site with poor soil conditions (as evident by. existing conditions on the site). The use of filter strips and filter swales incorporated into the surface drainage of the parking lots was investigated but deemed infeasible by the geotechnical engineer. However, the project will meet the intent of LID by several means. For one, the development will consist of a previously graded area, therefore not disturbing existing natural areas. Secondly, the project will incorporate on-site underground detention facilities to detain post- project peak flow rates back to pre-project peak flow rates, helping to maintain hydrologic Prepared By: DCB:TJ:kc/Repoa/15767-A.001 Rick Engineering Company - Water Resources Division 9 7-16-08 conditions and protect downstream channels from potential erosion. Finally, the treatment effets of swäles and strips will be 'met with the proposed- filtration devices. It is recognized that the incorporation of swales, strips, or pervious pavement are preferred LID techniques, however the unfavorable soil conditions require a plan that minimizes saturating the surrounding soils. 4.2b Source Control BMPs The term "source control BMP" refers to land use or site planning practices, or structures that aim to prevent urban runoff pollution by reducing the potential for contamination at the source of pollution. Source control BMPs minimize the contact between pollutants and urban runoff. The following discussion identifies the source control BMPs from Section 2.3.3.2 of the SUSMP that are proposed for Invitrogen project. Design Outdoor Material Storage Areas to Reduce Pollution Introduction There are no outdoor materials storage areas proposed for the project. Design Trash Storage Areas to Reduce Pollution Introduction There are no trash storage areas proposed for the project. Employ Integrated Pest Management Principles Integrated pest management principles will be implemented as applicable to the Invitrogen project. Use Efficient Irrigation Systems & Landscape Design Prepared By: - DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 10 7-16-08 Irrigation systems for the project will be designed to incorporate the following methods to reduce excessive irrigation runoff, which are described in the City SUSMP, where determined applicable and feasible: Automatic rain shutoff devices to prevent irrigation during and after precipitation. Irrigation systems will be designed per project's specific water requirements.. . Flow reducers or shutoff valves triggered by a pressure drop will be provided to help avoid flow of water in the event of sprinkler breakdown. The irrigation system throughout the site will utilize the "efficient" methods described above. In addition, very drought tolerant plants are proposed for the planters throughout the site so that only very minimal irrigation can take place. This has been proposed because of the very poor soil quality as discussed previously. Provide Storm Drain System Stenciling and Signage Typical storm water stenciling and signage procedures will be provided for all storm drain inlets and catch basins within the project area. The project owner or the project owner's authorized representative will contact the City of Carlsbad prior to completing the construction of any inlets to determine the most current stenciling requirements and incorporate that stenciling at the inlets. The stencils and/or labels discouraging illegal dumping to the stormdrain system will be maintained to provide legibility. 4.2.c Treatment Control BMPs The term "treatment control BMP" refers to any. engineered system designed and constructed to remove pollutants from urban runoff. Pollutant removal is achieved by gravity settling, filtration, biological uptake, media adsorption, or any other physical, biological, or chemical process. Section 2.3.3.4 of the SUSMP provides a selection process for treatment control BMP selection. The following discussion identifies the treatment control BMPs 'proposed for Invitrogen project. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick. Engineering Company - Water Resources Division 11 . 7-16-08 As discussed in Section 3.1.a, the project as a whole can be expected to generate the following pollutants: heavy metals, trash & debris, and oil and grease. Tables 4 and 4.1 of the City SUSMP provide a guide to BMP selection. The applicable portions of Tables 4 and 4.1 are reproduced below. Table 4. Treatment Control BMP Selection Matrix Pollutantsof Bloretention Settling Basins Wet Ponds Infiltration Facilities or Media High-rate High-rate Trash Racks & Concern Facilities (LID) (Dry (D Ponds) and Wetlands Practices Filters biofliters media filters Hydro- dynamic (LID) Devices Coarse Sediment and High High High 'High High High High High Trash Pollutants that tend to associate with fine particles High High High High High Medium Medium Low during treatment Pollutants that tend to be dissolved Medium Low Medium High Low Low Low Low following treatment ource: anaara urban iworm water Mitigation Plan, iUIrn. Table 4.1 Pollutants and Associated Particle Sizes Pollutant Coarse Sediment and Trash Pollutants-that tend to associate with fine particles during treatment Pollutants that tend to be dissolved following treatment Sediment X X Nutrients x. x Heavy Metals X Organic Compounds X - Trash & Debris X Oxygen Demanding - X Bacteria x Oil& Grease x Pesticides x ource: Manaara urban .torm water Mitigation Plan, iUUY. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 12 7-16-08 Descriptions of each BMP category shown in Tables 4 are summarized below: Bioretention Facilities (infiltration planters, flow-through planters, bioretention areas, and bioretention swales) - Facilities are designed to capture runoff and infiltrate slowly through soil media which also supports vegetation. Bioretention facilities, except for flow-through planters, effectively promote infiltration into native soils. In clay soils, facilities may capture excess treated runoff in an underdrain piped to the municipal storm drain system. Typical criteria: an infiltration surface, area at least 4% of tributary impervious area, 6-inch average depth of top reservoir, 18-inch soil layer, 12-inch to 18-inch gravel subsurface storage layer. Settling Basins and Wetlands (extended detention basins, "wet" basins, decorative or recreational ,lakes or water features also used for storm water treatment, constructed wetlands) - Facilities are designed to capture a minimum water quality volume of 80% of total runoff and detain for a minimum of 48 hours. Some wetland designs have proven effective in removing nutrients, but performance varies. Infiltration Facilities or Practices (infiltration basins, infiltration trenches, dry wells, dispersal of runoff to landscape, pervious pavements). These facilities and landscape designs capture, retain, and infiltrate a minimum of 80% of runoff into the' ground. Infiltration facilities are generally only feasible in permeable (Hydrologic Soil Group A br B) soils. Volume and area of infiltration facilities depends on soil permeability and safety factor used. Typical criteria: Infiltration facilities should have pretreatment to remove silt to prolong life of the facility. A 10-foot vertical separation from average seasonal groundwater depth is required. Dispersal to landscape may be accomplished in any soil type and generally requires a maximum 2:1 ratio impervious: pervious and concave topography to ensure the first 1 inch of rainfall is retained. Media Filters (sand filters) - Filters designed to treat runoff produced by a rainfall of 0.2 inches per hour (or 85th percentile hourly rainfall intensity) by slow infiltration through sand or other media. Typical criteria: Surface loading rate not to exceed 5 inches/hour. Entire surface of the sand must be accessible for maintenance. Prepared By: DCB:TJ:kc/Report/15767-A.00I Rick Engineering Company - Water Resources Division 13 7-16-08 High Rate Biofilters (tree wells, typically proprietary) - Biofllters with specially designed media to rapidly filter runoff while removing some pollutants. Filterra (proprietary version) recommends surface loading rates of up to 100 inches/hour. High-rate Media Filters (typically proprietary) - Vaults with replaceable cartridge filters filled with inorganic media. Hydrodynamic Devices - Hydrodynamic devices are flow-through structures with a settling or separation unit that removes sediment and other pollutants. No outside power source is required because, the energy of the flowing storm water allows the sediment to efficiently settle out. Pursuant to the above descriptions of each category of BMPs, high rate media filters are the most suitable BMP for the Invitrogen project. In addition to these high rate media filters, two hydrodynamic separator units will be installed on the Invitrogen campus, treating only areas from the previously developed portion of the Invitrogen campus. While not required for this project, the BMP retrofitting of the existing developed areas 'will improve the quality of runoff over existing conditions. High rate media filters are expected to treat all anticipated pollutants generated from the project site at a medium to high level of removal efficiency. Because of the poor soil conditions, none of the structural treatment control BMPs with higher pollutant removal efficiencies '(bioretention facilities, settling basins, wet ponds and wetlands, infiltration facilities, and media filters) could be utilized because they all in one way -or another require the flows to come in contact with the soil and filter through it, resulting in saturated conditions. The location of the high rate media filters and hydrodynamic separators are shown on the exhibit titled, "Storm Water Management Plan Exhibit for Invitrogen," located in Map Pocket 1. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 14 7-16-08 Numeric Sizing Treatment Standards High rate media filters and hydrodynamic separator units are designed to treat flows based on numeric sizing criteria found in Section 2.3.3.4 of the SUSMP. Pursuant to numeric sizing criteria in the SUSMP, the flow of runoff produced from a 0.2 in/hr storm event shall be used to design to flow-based BMPs. The following equation was used to determine the treatment flow rate: Flow: Q=CIA 'Q' is the treatment flow rate in cubic feet per second (cfs),. 'C' is the weighted runoff coefficient for the drainage area, 'I' is the rainfall intensity in inches per hour (in/hr) [0.2 in/hr for water quality], and 'A' is the drainage area in acres (ac). The calculations for the water quality treatment flow rates are included in Appendix C of this report. Details of the high rate media filters are included in Appendix D. Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 15 7-16-08 5.0 MAINTENANCE CONDITIONS Invitrogen will ensure the ongoing maintenance for the permanent storm water BMPs proposed for the project. Invitrogen will be responsible for properly disposing of waste material from their assumed areas within the project site, maintaining landscaping throughout those areas in a manner that will prevent soil erosion and minimize sediment transport, and maintaining drainage facilities located throughout the project area in a clean manner and in good repair. In addition, Invitrogen will be responsible for maintaining all post-construction BMPs. Typical Maintenance -Procedures for Treatment Control BMPs The following treatment control BMPs require permanent maintenance: hydrodynamic devises and high rate media filters. The discussions below, provide inspection criteria, maintenance indicators, and maintenance activities for the treatment control BMPs. Hydrodynamic Devices (e.g. CDS Units) CDS units will be utilized to treat runoff from the portion of the Invitrogen campus that has already been developed. Invitrogen will be responsible for the maintenance of the CDS units. The CDS units should be inspected periodically to ensure their condition is adequate to handle anticipated runoff. Initially following the installation of new treatment control BMPs, it is important to check that they are functioning properly and measure the amount of deposition occurring from specific storm events. Initially, inspections should be made on 'a monthly basis and after every storm event that exceeds 0.25 inches to check that the CDS units are functioning properly and whether they require servicing at that time. Based on these inspections, it may be necessary to adjust the frequency of scheduled inspection and maintenance cleanings. Once the CDS Units have 'been properly installed and are functioning, inspection and maintenance frequency may be adjusted as suggested by the manufacturer and service vendor. Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 16 7-16-08 High Rate Media Filters (e.g. Stormfdter Filtration Vaults or Baysaver Filtration Vaults) High rate media filters will be utilized to treat runoff from, the proposed improvements on-site. Invitrogen will be responsible for the maintenance of the high rate media filters. Initially following the installation of new treatment control BMPs, it is important to check that they are functioning properly and measure the amount of deposition occurring from specific storm events. The high rate media filter system should be inspected at least once a year and after major storm events. When the filters start to became saturated, they need to be replaced and the vault should be cleaned with a vacuum truck. Underground Detention Basin (e.g. Storm Tech System) The underground detention system is not intended as a treatment control BMP, however it will require maintenance. Specifically, the isolator row will focus maintenance to one section of the system in most cases, however the system as a whole will also require cleaning from time to time. Inspection and Maintenance Frequency The Table below lists, the BMPs to be inspected and maintained and the minimum frequency of inspection and maintenance activities. Table 5. Summary Table of Inspection and Maintenance Frequency (Minimum) BMP Inspection Maintenance Frequency Frequency CDS Units Annual Remove collected debris: yearly High rate media filters Annual Replace filters: 3 years (approx.) Underground Annual Remove collected debris in isolator row: yearly Detention Basin Remove debris from additional chambers: as needed Prepared By: . DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 17 7-16.08 The frequencies given in the Summary Table of Inspection and Maintenance Frequency are minimum recommended frequencies for inspection and maintenance activities for the Invitrogen project. Typically, the frequency of maintenance required for permanent BMPs is site and drainage area specific. If it is determined during the regularly scheduled inspection and/or routine maintenance that a BMP requires more frequent maintenance, it may be necessary to increase the frequency of inspection and/or routine maintenance. RecOrdkeeping Requirements Invitrogen is responsible to ensure implementation and funding of maintenance of permanent BMPs and shall maintain records documenting the inspection and maintenance activities. Parties responsible for the Operation and Maintenance (0 & M) Plan shall retain records for at least 5 years. A copy of the Operation and Maintenance (0 & M) Plan is included in Appendix E of this SWMP. Prepared By: . DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company- Water Resources Division 18 7-16-08 6.0 SUMMARY This Storm Water Management Plan (SWMP) summarizes the post-construction storm water - requirements for the Invitrogen project. The project is located in the City of Carlsbad just north of Faraday Ave and west of College Boulevard. The project proposes to create a parking lot on a small portion of the Invitrogen campus that is currently a mass graded pad. The majority of existing drainage boundaries and flow patterns will not change. The changes that are taking place are all contained on-site, and as a result the same areas are tributary to the same storm drain systems as in the pre-projëct condition. In both the pre-project and post-project condition, storm water runoff from the project site is conveyed across the site in a northerly direction before being tied into an existing storm drain system. This existing stonndrain system èonveys the flows northerly along College Blvd before outletting into Agua Hedionda Creek and ultimately into Agua Hedionda Lagoon. There is also a portion of the Invitrogen property that drains westerly along Faraday Ave, outlets into an unnamed tributary that ultimately discharges into Agua Hedionda Lagoon. For the purposes of post-construction storm water quality management, the project will follow the guidelines and requirements set forth in the City of Carlsbad's "Standard Urban Storm Water Mitigation Plan," adopted March 2008. Based on the NPDES Project Applicability Form, the project is a "Priority Project." The project proposes developing an existing mass graded pad into a parking lot, therefore, "Parking Lots" category shall be used to describe the anticipated or potential pollutants for the project. Based on the proposed land use, anticipated pollutants from the Invitrogen project include heavy metals, trash & debris, and oil and grease. The potential pollutants include sediments, nutrients, oxygen demanding substances, and pesticides. According to the "Water Quality Control Plan for the San Diego Basin," dated September 8, 1994, prepared by the SDRWQCB, the Invitrogen project is located in the following hydrologic Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 19 7-16-08 unit basin: Los Monos Subarea in the Agua Hedionda Hydrologic Area within the Carlsbad Hydrologic Unit. The corresponding hydrologic unit basin number designation is 904.31. The receiving waters for Invitrogen project that are currently listed as impaired based on the 2006 303(d) List include: Agua Hedionda Creek and Agua Hedionda Lagoon. The pollutants/stressors causing impairments are manganese, selenium, sulfates, total dissolved solids, indicator bacteria, and sedimentation/siltation. Due to its associated priority project category, it is not anticipated that the project will be discharging any bacteria/viruses, sediments (potential), or nutrients (potential), so heavy metals is the primary pollutant of concern and will be treated with the high rate media filters. Additional treatment BMPs (hydrodynamic devices) will also be installed to retrofit the existing development area of the Invitrogen property. The project will meet the intent of many aspects of low impact development as well as incorporate source control and treatment control BMPs, which are described in Section 4.0 of this report; The treatment control BMPs, high rate media filters, as well as a StormTech Isolator Row were selected based on evaluation of all treatment control BMPs listed in the SUSMP as the most suitable treatment control BMP based onsite constraints (e.g. very poor soils) and pollutant removal capability. The high rate media filters are expected to treat all anticipated pollutants of concern at a medium to high level of removal efficiency. High rate media filters are designed to treat flows based on numeric sizing criteria from the SUSMP, the flow of runoff produced from a 0.2 in/hr storm event. Invitrogen is the owner of the project and therefore will be responsible for maintenance of all permanent storm water BMPs. The following BMPs for the Invitrogen project require permanent maintenance: hydrodynamic devices, high rate media filters, and the underground detention basin. Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 20 7-16-08 APPENDIX A Development Application Storm Water Standards Questionnaire Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 DEVELOPMENT APPLICATION STORMWATER STANDARDS QUESTIONNAIRE I INSTRUCTIONS: I This questionnaire must be completed by applicant in advance of submitting for a development application (subdivision and land use planning approvals and construction permits). The results of the questionnaire determine the level of storm water pollution prevention standards applied to a proposed development or redevelopment project. Many aspects of project site design are dependent upon the storm water pollution protection standards applied to a project. Applicant responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. A staff determination that the development application is subject to more stringent storm water standards, than initially assessed by the applicant, will result in the return of the development application as incomplete. If applicants are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, they are advised to seek assistance from Engineering Department Development Services staff. A separate completed and signed questionnaire must be submitted for each new development application submission. Only one completed and signed questionnaire is required when multiple development applications. for the same project are submitted concurrently. In addition to this questionnaire, applicants for construction permits must also complete, sign and submit a Construction Activity Storm Water Standards Questionnaire. To address pollutants that may be generated from new development, the City requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design, which are described in Section 2 of the City's Storm Water Standards Manual This questionnaire should be used to categorize new development and significant redevelopment projects as priority or non-priority, to determine what level of storm water standards are required or if the project is exempt. Is your project a significant redevelopment? I Definition: Significant redevelopment is defined as the creation or addition of at least 5,000 square feet of impervious surface on an already developed site. Significant redevelopment includes, but is not limited to: the expansion of a building footprint; addition to or replacement of a structure; structural development including an increase in gross floor area and/or exterior construction remodeling; replacement of an impervious surface that is not part of a routine maintenance activity; and land disturbing activities related with structural or impervious surfaces. Replacement of impervious surfaces includes any activity that is not part of a routine maintenance activity where impervious material(s) are removed, exposing underlying soil during construction. Note: If the Significant Redevelopment results in an increase of less than fifty percent of the impervious surfaces of a previously existing development, and the existing development was not subject to SUSMP requirements, the numeric sizing criteria discussed in Section F.1.b. (2)(c) applies only to the addition, and not to the entire development. If your project IS considered significant redevelopment, then please skip Section 1 and proceed with Section 2. If your project IS NOT considered significant redevelopment, then please proceed to Section 1. SECTION 1 I NEW DEVELOPMENT PRIORITY PROJECT TYPE Does you project meet one or more of the following criteria: YES NO Home subdivision of 100 units or more. Includes SFD, MFD, Condominium and Apartments Residential development of 10 units or more. Includes SF0, MFD, Condominium and Apartments Commercial and industrial development greater than 100.000 square feet including parking areas. Any development on private land that is not for heavy industrial or residential uses. Example: Hospitals, Hotels, Recreational Facilities, Shopping Malls, etc. Heavy Industrial/ Industry greater than 1 acre (NEED SIC CODES FOR PERMIT BUSINESS TYPES) SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 Automotive repair shop. SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 A New Restaurant where the land area of development is 5,000 square feet or more including parking areas. SIC code 5812 Hillside development (1) greater than 5,000 square feet of impervious surface area and (2) development will grade on any natural slope that is 25% or greater Environmentally Sensitive Area (ESA). Impervious surface of 2,500 square feet or more located within, "directly adjacent "2 to (within 200 feet), or "discharging directly to"3 receiving water within the ESA1 Parking lot. Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban runoff Retail Gasoline Outlets - serving more than 100 vehicles per day Serving vehicles than square _more _than _100_ _per _day _and _greater _5,000_ _feet Streets, roads, highways, and freeways. Project would create a new that is_5,000_ square or greater. _paved _surface _feet Coastal Development Zone. Within 200 feet of the Pacific Ocean and (1) creates more than 2500 square feet of impermeable surface or (2) increases impermeable surface on property by more than 10%. I Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and Count of San Diego; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. 2 "Directly adjacent" means situated within 200 feet of the environmentally sensitive area. 3 "Discharging directly to" means outflow from a drainage conveyance system that is composed entirely of flows from the subject development or redevelopment site, and not commingled with flow from adjacent lands. Section 1 Results: If you answered YES to ANY of the questions above you have a PRIORITY project and PRIORITY project requirements DO apply. A Storm Water Management Plan, prepared in accordance with City Storm Water Standards, must be submitted at time of application. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3. If you answered NO to ALL of the questions above, then you are a NON-PRIORITY project and STANDARD requirements apply. Please check the "DOES NOT MEET PRIORITY Requirements" box in Section 3. [ECTION2 I SIGNIFICANT REDEVELOPMENT: YES NO 1. Is the project an addition to an existing priority project type? (Priority projects are defined in Section 1) X If you answered YES, please proceed to question 2. If you answered NO, then you ARE NOT a significant redevelopment and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the 'DOES NOT MEET PRIORITY Requirements" box in Section 3 below. . 2. Is the project one of the following: Trenching and resurfacing associated with utility work? X Resurfacing and reconfiguring surface parking lots? . X New sidewalk construction, pedestrian ramps, or bike land on public and/or private existing roads? X Replacement of damaged pavement? X If you answered NO to ALL of the questions, then proceed to Question 3. . If you answered YES to ONE OR MORE of the questions then you ARE NOT a significant redevelopment and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the "DOES NOT MEET PRIORITY Requirements" box in Section 3 below.. 3. Will the development create. or add at least 5,000 square feet of impervious surfaces on an existing development or, be located within 200 feet of the Pacific Ocean and (1)create more than 2500 square X feet of impermeable surface or (2) increases impermeable surface on property by more than 10%? If you answered YES, you ARE a significant redevelopment, and you ARE subject to PRIORITY project requirements. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3 below. If you answered NO, you ARE NOT a significant redevelopment, and you ARE NOT subject to PRIORITY project requirements, only STANDARD requirements. Please check the "DOES NOT MEET PRIORITY Requirements" box in Section 3 below. SECTION 3 I Questionnaire Results: MY PROJECT MEETS PRIORITY REQUIREMENTS, MUST COMPLY WITH PRIORITY PROJECT STANDARDS AND MUST PREPARE A STORM WATER MANAGEMENT PLAN FOR SUBMITTAL AT TIME OF APPLICATION. El MY PROJECT DOES NOT MEET PRIORITY REQUIREMENTS AND MUST ONLY COMPLY WITH STANDARD STORM WATER REQUIREMENTS. Applicant Information and Signature Box This Box for City Use Only Address: Assessor Parcel Number(s); Applicant Name: Applicant Title: Applicant Signature: Date: City Concurrence: I YessI No By: Date; Project ID: APPENDIX B Invitrogen Hydrologic Location Map Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 I IX~ I - - + mill - Ali '- AR Project Location mm I I I \ I Invitrogen Hydrologic Location Map Filepath: A \1 5767\GIS\15767_Hydrologic_Map_Exhibit.mxd D8 Sources. SalAssessor Parcels April 2006 00 3,000 000 SanGIS Roads - February 2006 ExHbit Date: July 16, 2008 _ Feet Landiscor Aerial Photo January 20 RECJN: 15767-A ___ APPENDIX C Treatment Flow Rate Calculations Prepared By: - DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 7.16-08 I ... IN . 5620 Friars Road m - San Diego, CA 92110.2596 ENGINEERING COMPANY Tel: (619) 2910707 Fax: (619) 2914165 Date Job No. Page Done By Checked By (°. TM 5620 Friars Road San Diego, CA 92110.2596 ENGINEERING COMPANY Tel: (619) 291.0707 Fax: (619) 2914165 Date Job No. Page Done By • • Checked By Cc, 1c w lot n • • • • • • •• • • 0r •• • Li I P1 TM MENGIMWOM . I 5620 Friars Road San Diego, CA92110-2596 Tel: (619) 2910707 Fax: (619) 2914165 Date o3/2ojO job No. 1677 ..• Page Done By Checked By LIIi IT..II.':J1 ....... . •7• ILII :'..TII:.[I.I.LI.:::I1•:1IIIIIII1zI]I...1....... •• {J :c 4con r iY) i I V :• • • LLI / cL,= 617 '4dtAsk ,'4r1J 5 (ZT! i -= 01:71 - - i I I LI I I APPENDIX D Details for Hydrodynamic Devices & High Rate Media Filters Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 APPENDIX E Operation and Maintenance (0 & M) Plan (Intentionally left blank. To be completed in next submittal) Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 MAP POCKET 1 Storm Water Management Plan Exhibit for Invitrogen Prepared By: DCB:TJ:kclReport/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 .,.,1'"• :1 '7 ) '., ..44,334 $33'3' ..'' 73,..".' ' ., 333 44 3 3. 3 3 3 433 4,337/ . .......... : 3 " '.':±..'.'." '1" ,.".:'.: ,,, , \ '. .33 L 3 .. -nimr I.. 77777 '4- 33 Ul - r / T --:' >'. , 4.3 3 • 34", t* I . ' j 4 .4'' 4334 * \ I 33*34 \344;4 3 \3 34 t' L44 33 '1 * \,44 ,34. • j43\ .4 ... '334%\33 433,. i.4f444.34 33, '43 ....... . .4 I 4 3. .3.4 4 "4' 33.3 4 ,t4: .4,4 . '4 "/ \ *3iik 34 33 34 >, 4.3 "4 I .4 3333 44 1," I , 44333334 \4'33\ 33\ 33*3 4 ,4 3333 33.34 •.\4 343'. 3333\\; '. \433 ''33.I'. 4. ) 13 33 34 4., .4334 4.33, 0 3333 33333' 44334.33, 4" 33 C .4' 333 33 3. 33 4. 33 4.3.4 ,,, 33 7 "3 3.3 .3333.333343 1' 43333' ' '4 4'4•• , 33 I ' '. 4.33 44' 33 33 44- / 5:; 44 --- • 33433. 44, NOTES v er THESE POST-CONSTRUCTION BMPs ARE DISCUSSED IN MORE 4," • ''4"' 4" .".. , ,"A' DETAIL WITHIN THIS STORM WATER MANAGEMENT PLAN. REFER TO EXHIBIT TITLED "DRAINAGE b .3: STUDY MAP FOR INVITROCEN (POST-PROJECT)"IN MAP JJ POCKET #2 OF THIS STORM WATER MANAGEMENT PLAN -"v FOR DRAINAGE AREAS, NODE NUMBERS AND ADDITIONAL 0 R SITE INFORMATION. '34 •" 3344 /3 33 4 4 33 .4 .4 4. 4 33 "3333 "''5,433>,3 743./j 33L';3,374'i 33 "3''''''' '4.,"4 3 /" 1443 .....,/.."4". . ,,•,,,• 334/ ,/.333/9/43,.Y '4'4'3 •44ir, / ,, 33 43. 33 414; 4.4 '4 .4 $ : : 1T "i '4 •' .IT ,,., .. / ;:; / / 4 / .. : : - SD o 333 •• 33 •, "4334 f' v. 33 so 33 POST-CONSTRUCTION BMP LEGEND A LOCATION OF PROPOSED HYDRODYNAMIC SEPARATOR SYSTEMS LOCATION OF PROPOSED FILTRATION SYSTEMS '. LOCATION OF PROPOSED UNDERGROUND DETENTION BASIN NEWLY PLANTED AREAS-SEE APPROVED LANDSCAPE PLANS PROPOSED IMPERVIOUS AREAS -4. .4- STORM, WATER MANAGEMENT PLAN EXHIBIT FOR INVITROGEN J-15767-A Date: July 16, 2008 16-JUL-2008 16-27 NOT FOR CONSTRUCTION EXHIBIT FOR STORM WATER MANAGEMENT PLAN ONLY MAP POCKET 2 Drainage Study Map for• Invitrogen Prepared By: DCB:TJ:kc/Report/15767-A.001 Rick Engineering Company - Water Resources Division 7-16-08 DRAINAGE STUDY MAP FOR INVITROGEN 3- . 7.. . .: 2...... I I. N- - ......... . . . ...... . .... $1 : — (n_ An A(T) (0.25 ACy )-' : r - 70 AC) 16 P1OACD [POST-PROJECT] L0 __~'115 ow (060 AC) . . ..: ':' ' .: -. " ...... :3-'.,, ,..": ......... :.: .: AC.) ... -. ,,- •,•3- ../ - ./ ' : .' /O] 1 -r —; SD /1 0.50 AC.A. (0 15 AC) @ô AC (0.50 AC) 3-3-3-3- 1 -/.-7-z;s 3-3-1iJ.. (1015 AC) jV 7/ 3- 7- 01] (030 AC) 16 — c ______ 3- SD AC. SO ________ / 66. 3-- /-- 3- <3- 7- 50 3-3-3-7- 7, V, v, '3- 3 3- ;/, - - - / -3- // / 41 I ,. .- 3- .- 7- 3- / - NL el 1.10 AC. AC. 0........ 0.5 AC. - 3- / 3- 3- 73- 8 - : \__N 3/ / _:_- '-•- .................------ -. (105 A 3-3-3- 7- 3- 7/ 3- 3- .- *3- & '3-7 3- h. $ ij A g. 3-.., 0.20 -. 0.20 AC gjf 3-' H -' --- '--3- . e, oll '- / (0 20 AC 2 01 ALF N. /3- 3- 3- 3-- FM 1,_ I i J 0.30 3-- iv`' 3- 1 (f20 AC) ni-t--r II I Lt#1'l 1 I III .O30A)j /3-3- 3-,.,, ry .1 * 7- 7 7 - I I 3-3- *- / -7 13-3-3- \3-•••'-' -"- - 1 '1 — 2 41 3-3- 7- I -- — - 3-3-' 3-3- 3-- 3- "'0. 20 AC .7- .3- __3-3-__3-3-. - 'J- INVITROGEN DATE: J U LY 16, 2008 JOB NUMBER: 15767 60 30 0 60 120 180 GRAPHIC SCALE 111= 60'