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HomeMy WebLinkAboutCDP 04-59; Bob Baker Jeep Facility Expansion Site; Storm Water Quality; 2005-03-31WATER QUALITY TECHNICAL REPORT FOR BOB BAKER VOLKSWAGEN/SUBARU PROJECT SITE Job Number 14140 May 24, 2002 Revised: March 31, 2005 RICK liM LIU\i: ( \ 'Ml' ,( 7 j<,'r !('(',','Mi;.( ( uri WATER QUALITY TECHNICAL REPORT FOR BOB BAKER VOLKSWAGEN/SUBARU PROJECT SITE Job Number 14140 Dennis C. Bqwlii R.c.E. mmw Exp. 06/06 Prepared By: Rick Engineering Company Water Resources Department 5620 Friars Road San Diego, California 92110-2596 (619) 291-0707 L Prepared For: Bob Baker Enterprises, Inc. 591 Camino De La Reina, Suite 1100 San Diego, California 92108 (619) 297-1001 May 24, 2002 Revised: March 31, 2005 Water Quality Technical Report for Bob Baker VW/Subaru REVISION PAGE March 31,2005 Rick Engineering Company has reviewed Plan Check Comments for the Water Quality Technical Report dated May 24, 2002 in regards to the Bob Baker Volkswagen/Subaru project located in the City of Carlsbad. The following is an outline of the City's January 26, 2005 plan check comments (in italicized lettering) and Rick Engineering Company's responses (in bold lettering). 1. Change the project title to "Bob Baker Volkswagen/Subaru Project Site. The title of the project has been changed throughout to reflect the above title. 2. Update the report date. The report date will be updated to reflect the submittal date. ^^^^"^ f^t/a/e the Registered Professional Engineer stamp to reflect a current registration. The Registered Professional Engineer stamp has been updated to reflect current registration. 4. Include Storm Water Requirements Applicability Checklist has been included in Appendix A of this report. The Storm Water Requirements Applicability Checklist has been included in Appendix A of this report. 5. Provide clarification regarding the 8,000 square feet of surface area for site. The expansion area for the Bob Baker sire is approximately 18,000 square feet. The expansion area can me seen in the enclosed map in Map Pocket 1 titled, "Site Flan for Bob Baker VW/Subaru Expansion Project". 6. Clean storm water prior to leaving site. In the existing condition, the Bob Baker Volkswagen/Subaru Project drains to the existing 10-foot inlet located in Paseo Del Norte. The project is not proposing to drain to the inlet located in Paseo Del Norte. However, the proposed inlet filter insert will treat the entire tributary area at the sump inlet per the municipal permit. Prepared By: DCB:FL:nd/Report/M140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 7. Clean entire site. The treatment flow that was calculated for the treatment control BMP is based off of the total area contributing to the 10-foot inlet in Paseo Del Norte. The total area is 11.4 acres. Please refer to calculations located in Appendix C of this report. 8. Calculate actual capacity you need to consider actual drainage basin for inlet. The actual treatment capacity for the 10-foot inlet in Paseo Del Norte was calculated and is located in Appendix C of this report (and is based on the entire tributary area to the inlet). 9. Comment on the required treatment flow to the 10 foot inlet in Paseo Del Norte. The treatment flow for the 10-foot inlet in Paseo Del Norte was calculated and is located in Appendix C of this report. Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 REVISION PAGE FOR BOB BAKER VW/SUBARU J-14140 DATE REVISION/CHANGES MADE TO PROJECT 24-May-02 Report completed but not submitted December-04 Report submitted with the May 24, 2002 date 8-Feb-05 Second submittal with City of Carlsbad January 26,2005 plan check comments addressed Prepared By: Rick Engineering Company - Water Resources Division DCB:FL:nd/Report/14l40.003 05-24-02 Revised: 3-31-05 TABLE OF CONTENTS 1.0 Introduction ^ 2.0 Vicinity Map 3 3.0 Water Quality Requirements During Construction 4 4.0 Water Quality Requirements Post-Construction 6 5.0 Permanent Storm Water BMP Selection Procedure 8 6.0 Permanent Storm Water Best Management Practices (BMP's) 22 7.0 Anticipated Maintenance Condition(s) 23 8.0 Summary 25 Appendices: Appendix A: Storm Water Requirements Applicability Checklists and Forms Appendix B: Detail of Inlet Filter Insert - Bio Clean Curb Inlet Basket Appendix C: Calculations for Water Quality Treatment Flow Requirements and Treatment Capacity of Inlet Filter Insert Appendix D: Approximate Costs for Treatment Control BMP's Appendix E: Location Map For Bob Baker VW/Subaru Project in Hydrologic Basin 904.40 Map Pocket: Site Plan for Bob Baker VW/Subaru Prepared By: ' DCB:FL:ndAleport/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 1.0 INTRODUCTION This water quality technical report (WQTR) describes the permanent storm water Best Management Practices (BMPs) that will be incorporated in the project to mitigate the impacts of urban runoff due to the redevelopment of the Bob Baker Volkswagen(VW)/Subaru expansion project ("project") located in the City of Carlsbad, California. The project is located at 5500 Paseo Del Norte in Carlsbad. See the Vicinity Map, located in Section 2.0 of this report for the approximate project location. The project consists of expansion of approximately 18,000 square feet of surface area at the Bob Baker Volkswagen/Subaru site. The scope of work includes expanding an existing showroom by increasing the footprint of an existing building, extend a service bay canopy from the building addition, resurface the driveway from Paseo Del Norte to the proposed service bay canopy by removing and replacing asphah concrete pavement, and create six new service kiosks. The proposed redevelopment of the Bob Baker Volkswagen/Subaru expansion project will follow the guidelines and requirements set forth in the City of Carlsbad ''Standard Urban Storm Water Mitigation Plan, Storm Water Standards: Manual for Construction and Permanent Storm Water Best Management Practices Requirements,'' (herein referred to as Storm Water Standards), dated April 2003. Completed copies of the "Storm Water Requirements Applicability Checklists and Forms" provided within the Storm Water Standards manual has been included in Appendix A of this WQTR. Based on the April 2003 City of Carlsbad Storm Water Standards, the current redevelopment is labeled under the category of "Significant Redevelopment". However, this category is not mentioned in the "Storm Water Requirements Applicability Checklists". According to the "Storm Water Requirements Applicability Checklists", the Bob Baker VW/Subaru Extension Project redevelopment is a "Standard Permanent" project and only adheres to the requirements that fall under this category. However, the Bob Baker VW/Subaru Extension Project will incorporate a treatment control BMP to treat the storm water runoff prior to discharging into the public storm drain. The project drains to Paseo Del Norte via surface flow and two existing 4-inch PVC sidewalk underdrains. Storm water runoff from the site enters an existing 10.0-foot opening San Diego Regional Standard Type B curb inlet located in Paseo Del Norte approximately 60 feet downgradient from the site. Since the project site is less than one acre, and not part of a larger common plan of development, the project is not subject to National Pollutant Discharge Elimination System (NPDES) requirements during construction. However, the project owner is responsible to ensure that the project complies with the NPDES requirements given in the Clean Water Act including preventing the discharge of sediment or other pollutants in storm water rtinoff from the site. Water quality requirements for pre- and post-construction are discussed in further detail in Section's 3.0 and 4.0 of this report. The proposed redevelopment of the project site will not increase the amount impervious surfaces from existing to proposed conditions. As a result, there will not be an increase in storm water runoff as compared to existing conditions. Further discussion of the hydrologic and environmental impacts of the Bob Baker Volkswagen/Subaru expansion project and the selection of BMPs are discussed in Section 5.0 of this report. The project will provide permanent storm water BMPs to ensure that water quality treatment is provided prior to storm water runoff discharging into the public storm drain system. Further discussion of permanent storm water BMPs are discussed in Section 6.0 and the maintenance conditions for the proposed permanent storm water BMPs are discussed in Section 7.0 of this report. 2.0 VICINITY MAP 3.0 WATER QUALITY REQUIREMENTS DURING CONSTRUCTION In April of 2003, the City of Carlsbad issued the Storm Water Standards manual which states the following: "The primary objectives of the Storm Water Standards manual requirements are to: (1) Effectively prohibit non-storm water discharges; and (2) Reduce the discharge of pollutants from storm water conveyance systems to the Maximum Extent Practicable (MEP statutory standard) both during construction and throughout the use of a developed site." The Storm Water Standards manual is "intended to provide information on how to comply with all of the City's permanent and construction storm water BMP requirements, for new private and public development projects in the City of Carlsbad." The effective date of the City's Storm Water Standards manual is December 2, 2002, and applies to all projects requiring any permit approvals on or after December 2, 2002 The Bob Baker Volkswagen/Subaru expansion project is not subject to the requirements of the State Water Resources Control Board (SWRCB) Order No. 99-08-DWQ National Pollutant Discharge Elimination System (NPDES) General Permit No. CAS000002 (General Construction Permit) or Order No. 2001-046, modifications to the General Construction Permit, during the construction phase. The SWRCB adopted the General Construction Permit on August 19, 1999, and the modifications to the General Construction Permit on April 26, 2001. The General Construction Permit and modifications to the General Construction Permit are for projects 1 acre or greater in size, or projects that are part of a larger common plan of development that is 1 acre or greater in size. Therefore, a Storm Water Pollution Prevention Plan (SWPPP) is not required for this project. However, a Water Pollution Control Plan (WPCP) will be provided upon final design. It is anticipated that Rick Engineering Company will prepare a WPCP to identify all construction BMP requirements required by Section IV of the Storm Water Standards. The expansion area at the project site is approximately 0.4 acres, and is not part of a larger common plan of development. However, the project owner is responsible to ensure that the project complies with the NPDES requirements given in the Clean Water Act including preventing the discharge of sediment or other pollutants in storm water runoff from the site. Temporary BMPs will be used during construction to prevent the discharge of sediment or other pollutants in storm water runoff from the project site. In the site's present state, the pollutants of concern for the site include sediment, trash and debris, and oil and grease (due to presence of parking and impervious surfaces). During construction the pollutants of concern on the site are sediment and non-visible pollutants. The site owner is responsible to prevent these pollutants from leaving the site by implementing temporary BMPs. Typical temporary BMPs that may be used during construction include good housekeeping practices and erosion and sediment control measures. Good housekeeping practices include practices such as street sweeping, waste disposal, vehicle and equipment maintenance, concrete washout area, materials, storage, and minimization, proper handling, and storage of hazardous materials. Typical erosion and sediment control measures include silt fences, fiber rolls, gravel bags, temporary desilting basins, velocity check dams, temporary ditches or swales, storm water inlet protection, soil stabilization measures such as erosion control mats, tackifier, or hydroseed, and other measures. The City of Carlsbad's Jurisdictional Urban Runoff Management Plan (JURMP) provides lists of minimum BMPs and additional BMP requirements for construction sites. Several BMP handbooks including the Caltrans Storm Water Quality Practice Guidelines, the California Storm Water Management Handbooks, etc. provide design standards for the BMPs. The following section of this WQTR, Section 4.0, provides information on the water quality requirements for the project site, following the completion of the project (post-construction). 4.0 WATER QUALITY REQUIREMENTS POST-CONSTRUCTION The project is subject to the requirements of the Municipal Storm Water Permit (Municipal Permit) adopted by the California Regional Water Quality Control Board, San Diego Region (SDRWQCB), Order No. 2001-01, National Pollutant Discharge Elimination System (NPDES) No. CAS0108758 draining the watersheds of the County of San Diego, the incorporated cities of San Diego County, and the San Diego Unified Port District. The project owner is responsible to ensure that the project complies with the NPDES requirements given in the Clean Water Act including preventing the discharge of sediment or other pollutants in storm water runoff. Therefore, the site owner is responsible to prevent these pollutants from entering the public storm drain system by implementing permanent BMP's. The amount of runoff that must be treated may be calculated using volume-based criteria or flow-based criteria, depending on the type of best management practice (BMP) selected to meet this requirement. The Municipal Permit provides several criteria for calculating treatment volume of runoff for volume-based BMPs or treatment flow for flow-based BMPs. The Municipal Permit also requires that new developments maintain or reduce pre-development erosion and protect stream habitat. This may be accomplished by controlling peak discharge rates and velocities. The Bob Baker Volkswagen/Subaru property on which the project is located is in the category (established by the Municipal Permit) of "Standard Permanent Storm Water BMP Requiremenf'. This category is not a priority development category. According to the "Storm Water Requirements Applicability Checklists", the Bob Baker VW/Subaru Extension Project redevelopment is a "Standard Permanent" project and only adheres to the requirements that fall under this category. However, the Bob Baker VW/Subaru Extension Project will incorporate a treatment control BMP to treat the storm water runoff prior to discharging into the public storm drain. Typical storm water pollutants that may be anticipated from a development such as the existing development include trash, heavy metals, and oil and grease. While the site is not expected to generate a large volume of sediment once buildout, some sediment will be tracked in by cars and a small amount may be generated on site. This sediment is defined as a pollutant, and may also contain attached pollutants such as heavy metals. The majority of these typical pollutants will be transported by low flows occurring during the initial stage of a storm event. The following section of this WQTR, Section 5.0, 6.0 and 7.0, provides information on the permanent BMP selection for the project site and anticipated maintenance. 5.0 PERMANENT STORM WATER BMP SELECTION PROCEDURE Section III of the Storm Water Standards Manual outlines the procedtire for selection of permanent BMPs. Step 1 of the procedure is to identify pollutants and conditions of concern. Step 2 of the procedure is to select and establish BMPs. These steps will be discussed in this section of the WQTR. The specifics regarding design of the selected BMPs (as applicable) will be discussed in Section 6.0 of this WQTR. Step 1 - Identify Pollutants and Conditions of Concern l.A Pollutants from the Project Area Table 2 of the Storm Water Standards (Section III.l.A), "Anticipated and Potential Pollutants Generated by Land Use Type", indicates general pollutant categories that are either anticipated or potential pollutants for specific project categories. The current redevelopment is labeled under the category of "Significant Redevelopment" and does not fall under the "Priority Project Checklist". However, the Bob Baker Volkswagen/Subaru Extension Project will incorporate a treatment control BMP to treat the categories listed below. The applicable sections of Table 2 of the Storm Water Standards Manual have been reproduced below in Table 5.1. Table 5.1 - Anticipated and Potential Pollutants Generated By Land Use Type General Pollutant Categories Priority Project Categories Sediment Nutrients Heavy Metals Organic Compounds Trash & Debris Oxygen Demanding Substances Oil& Grease Bacteria & Viruses Pesticides Commercial Development p(l) p(l) p{2) X p{5) X p(3) p(5) >100,000 ft^ Parking Lots p(l) p(l) X X p(l) X p(l) X = anticipatec P = potential (1) A potential pollutant if landscaping exists on-site. (2) A potential pollutant if the project includes uncovered parkin g areas. (3) A potential pollutant if land use involves food or animal waste products. (4) Including petroleum hydrocarbons. (5) Including solvents. Source: City of Carlsbad - Storm Water Standards, April 2003, Section 3 - Table 2 Based on the information in Table 5.1 (above), anticipated pollutants for the project includes the following: Heavy Metals, Trash and Debris, and Oil and Grease. Potential pollutants that are not already listed as "anticipated" include the following: Sediments, Nutrients, Organic Compounds, Oxygen Demanding Substances, Bacteria and Viruses, and Pesticides. Due to the small amount of landscaping on-site and that the majority of the landscaping is bounded by a concrete curb, nutrients, oxygen demanding substance, and pesticides are not expected pollutants for this project site. In addition, due to the physical characteristics of this site, bacteria and viruses are not expected pollutants for this project site. However, while the site is not expected to generate a large volume of sediment once build-out has been completed, some sediment will be tracked in by cars and a small amount may be generated on site. This sediment is defined as a pollutant, and may also contain attached pollutants such as heavy metals (anticipated for parking lots and streets/highways). Also, Organic Compounds will be a potential pollutant due to the uncovered parking areas. The majority of anticipated and potential pollutants will be transported by low flows that typically occur during the initial stage of a storm event. l.B Pollutants of Concern in Receiving Waters According to the "Water Quality Control Plan for the San Diego Basin (9)", dated September 8, 1994, the proposed Bob Baker Volkswagen/Subaru redevelopment project is within the Carlsbad Hydrologic Unit and Encinas Hydrologic Area. The corresponding number designation is 904.40 (Region '9', Hydrologic Unit '04', Hydrologic Area '4', and Hydrologic Subarea 0). Both the existing and proposed conditions for the project site indicate that storm water runoff will enter into an existing storm drain system in Paseo Del Norte. The existing underground storm drain system flows in a northerly direction and eventually discharges to the Pacific Ocean. An exhibit has been provided in Appendix E of this report thled, "Location Map for Bob Baker VW/Subaru Project in Hydrologic Basin 904.40," which shows the project location in reference to Hydrologic Unit (HU) 904.40. The exhibit in Appendix E is the Geographic Information Systems (GIS) version of the hydrologic basin boundaries provided within the "Water Quality Control Plan for the San Diego Basin (9)," prepared by the SWRCB, dated September 8, 1994. On February 4, 2003, the SWRCB adopted the 2002 CWA Section 303(d) List (which was later approved in July 2003 by the USEPA) to update the previous 1998 Clean Water Act Section 303(d) List. There are no water bodies within Hydrologic Unit 904.40 currently listed as impaired on the 2002 CWA Section 303(d) List. Therefore, the Bob Baker VW/Subaru Expansion redevelopment project does not discharge directiy into a 303(d) listed impaired water body and is not subject to the requirements of a 303(d) listing. For the purpose of identifying primary and secondary pollutants of concern (as defined in the Storm Water Standards manual), there have been no primary pollutants of concern identified since the Bob Baker VW/Subaru Expansion redevelopment project outfall location is not within 200 feet of an impaired or Environmentally Sensitive Area. Therefore, each of the pollutants anticipated to be generated by the project, as identified in Table 5.1 - Anticipated and Potential Pollutants Generated by Land Use Type (Section III.I.A in the Storm Water Standards manual), have been considered secondary pollutants of concern. These secondary pollutants of concern were discussed eariier in this section of the report, subtitled "Pollutants from the Project Area", and were identified as the following: Heavy Metals, Trash and Debris, and Oil and Grease (while "potential" secondary pollutants include Sediment and Organic Compounds). l.C Conditions of Concern Common impacts to the hydrologic regime resulting from redevelopment typically consist of the following: increased runoff volume and velocity; reduced infiltration; increased flow frequency, duration, and peaks; faster time to reach peak flow; and water quality degradation. Conditions of concern for the project are related to any changes to the hydrologic regime for the project site that may cause adverse impacts to downstream channels and habitat integrity. The project site does not receive off-site drainage from any of the adjacent lots. In addition, the common impacts resulting from redevelopment are not a concern based on the minimal change form existing to propose. An exhibit has been provided in Map Pocket I of this report, titied "Site Plan for the Bob Baker VW/Subaru", which provides the redeveloped project layout and drainage patterns for on-site runoff As shown on the exhibh in Map Pocket 1, all on-site storm water runoff is directed towards the 10.0-foot Type B Inlet in Paseo Del Norte. The pre-project condition for the site is mostly paved and impervious and includes one existing building. The post-project condition will not alter from that of the pre-project condition. Therefore, the impervious area does not change form the pre-project condition. For both the pre- project and post-project conditions, runoff will predominantly sheet flow with some concentration along existing curbs and proposed ribbon gutters. In both conditions, the surface runoff is directed in a westerly direction where storm water runoff discharges off-site. In the pre- and post-project condition, runoff discharges to the existing curb and gutter along Paseo Del Norte, and is collected approximately 60-feet downstream at an existing 10.0-foot Type B inlet. Since the general drainage patterns remain the same from pre-project to post-project conditions, and the fact that the amount of impervious area remains the same, there will be no measurable increase to peak storm water runoff, volume, or velocity. The redevelopment of the project site will provide post-construction BMPs to ensure that water quality treatment is provided prior to discharging storm water runoff into the existing underground public storm drain system located within Paseo Del Norte. The existing public storm drain system in Paseo Del Norte flows north where it eventually discharges to the Pacific Ocean. See the exhibh titied "Site Plan for the Bob Baker VW/Subaru", located in Map Pocket 1, to view the locations where the on-site runoff is captured by the off-site public storm drain system. The post-construction BMP that will be provided will mitigate for impacts that may otherwise be expected to adversely affect downstream channels and habitat integrity. Due to the fact that there is not a change in the hydrologic regime and the post-project runoff will be treated before it enters the public storm drain system, the Bob Baker VW/Subaru Expansion Project does not contain any downstream conditions of concern. Step 2 - Establish Permanent Storm Water Best Management Practices Step 2 of the procedure is to identify and implement all applicable BMPs for the project. Pursuant to the Storm Water Standards. "Applicants may employ alternative comparable and equally effective site design and source control BMPs (including requirements applicable to individual priority project categories), satisfactory to the City Engineer." Priority Projects are also subject to implement the BMP requirements applicable to individual priority project categories, as listed in Table 5.2 - Standard Development Project & Priority Project Storm Water BMP Requirement Matrix, within Section II. 1 of the Storm Water Standards. The applicable sections of Table 5.2 of the Storm Water Standards have been reproduced below in Table 5.2. Table 5.2 - Standard Development Project & Priority Project Storm Water BMP Requirements Matrix Site Design BMPs f' Source Control BMPs" BMPs Applicable to Individual Priority Project Categories'- 3 o .2 =y o o Q ffl o c c B '3 o o O .3 I 0-<L> O •e 3 00 3 .E 'E, u •a Treatment Control BMPs'*' Standard Projects R R O 0 O O O O O O O O O Priority Projects Commercial Development greater than 100,000 ft^ R R R R R R Parking Lots R R R(5) R = Required: select one or more applicable and appropriate BMPs from the applicable steps in Section III.2.A-D, or equivalent as identified in Appendix C. O = Optional/ or may be required by City staff. As appropriate, applicants are encouraged to incorporate treatment control BMPs and BMPs applicable to individual priority project categories into the project design. City staff may require one or more of these BMPs, where appropriate. S = Select one or more applicable and appropriate treatment control BMPs from Appendix C. (1) Refer to Section III.2.A. (2) Refer to Section III.2.B. (3) Priority project categories must apply specific storm water BMP requirements, where applicable. Priority projects are subject to the requirements of all priority project categories that apply. (4) Refer to Section I1I.2.D. (5) Applies if the paved area totals >5,000 square feet or with >I5 parking spaces and is potentially exposed to urban runoff. Source: Storm Water Standards Manual, 2003 The project will integrate urban storm water management controls and implement permanent storm water BMPs to ensure that water quality treatment is provided prior to storm water runoff discharging into public storm drain system. The following sections 2.a through 2.c of this WQTR will discuss the permanent storm water BMPs proposed for the project. The specifics regarding design of the selected BMPs (as applicable) will be discussed in Section 6.0 of this WQTR. Underlined and/or italicized text in the following discussion represents headings and line items from Section II.2 of the Storm Water Standards manual. Portions of tiie italicized text are condensed from the Storm Water Standards manual. The text following the underiined or italicized text is the response as it relates to the Bob Baker project. 2.a Site Design "Site design BMP" means any project design feature that reduces the creation or severity of potential pollutant sources, reduces the alteration of the project site's natural flow regime, or maintains or reduces pre-development erosion and protects stream habitat. Bob Baker VW/Subaru Expansion redevelopment project is a redevelopment project located in an existing urbanized area. Site design BMPs will be applied where possible. The following discussion identifies the site design BMPs from Section II.2.A of the Storm Water Standards Manual that is proposed for the project. Maintain Pre-Development Rainfall Runoff Characteristics 1. Minimize impervious footprint The Bob Baker VW/Subaru Extension Project consist of the expansion of an existing showroom, the addition of six new kiosk onto existing pavement, and the re-paving of an existing asphalt. Therefore, there is no addition of impervious footprint for the Bob Baker VW/Subaru Extension Project. 2. Conserve natural areas. The Bob Baker VW/Subaru Extension Project is located on an existing development that consists of approximately 2.8 acres of impervious land. Therefore, there is no natural area to conserve. 3. Minimize directly connected impervious areas. The redevelopment project will stay consistent with the existing drainage patterns. Currentiy, the existing site drains to an existing inlet in Paseo Del Norte. 4. Maximize canopy interception and water conservation consistent with the Carlsbad Landscaping Manuel. The redevelopment project will stay consistent with the existing drainage patterns. Currently, the existing site drains to an existing inlet in Paseo Del Norte. Protect Slopes and Channels 5. Convey runoff safely from the tops of slopes. There are no proposed slopes associated with this project. The redevelopment project will stay consistent with the existing drainage patterns. Currently, the existing site drains to an existing inlet in Paseo Del Norte. 6. Vegetate slopes with native or drought tolerant vegetation. There are no proposed slopes associated with this project. 7. Stabilize permanent channel crossings. Currently, there are no channel crossings within the Bob Baker VW/Subaru Extension Project. 8. Install energy dissipaters, at the outlets of new storm drains, culverts, conduits, or channels ...to minimize erosion. The Bob Baker VW/Subaru Extension Project does not propose any new storm drains, culverts, conduits, or channels. 2.B Source Control BMPs Source control BMPs (both structural and non-structural) means 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 minimizes the contact between pollutants and urban runoff. General examples of source control BMPs include roof structures over trash or material storage areas, and berms around fiiel dispensing areas. The following discussion identifies the source control BMPs from Section II.2.B of the Storm Water Standards Manual that is proposed for the project. Design Outdoor Material Storage Areas to Reduce Pollution Introduction 9. Hazardous material with the potential to contaminate urban runoff. The Bob Baker VW/Subaru Extension Project does not propose any material storage for the redeveloped site. Design Trash Storage Areas to Reduce Pollution Introduction 10. Trash storage areas. Existing trash storage areas contain lids that keep the trash covered. There will not be any change to the trash storage area. Use Efficient Irrigation Systems & Landscape Design 11. Employ rain shutoff devices. At this time, landscape plans have not been prepared. However, it is anticipated that the plans will include rain shutoff devices. 12. Design irrigation systems to each landscaped area's. At this time, landscape plans have not been prepared. However, h is anticipated that the plans will include an irrigation system in the proposed landscaped area. Provide Storm Water Conveyance Svstem Stenciling and Signage 13. Provide concrete stamping, porcelain tile, inset permanent marking or equivalent...of all storm water conveyance system inlets and catch basins within the project area.... There are no proposed conveyance systems within the redevelopment. 14. Post signs and prohibitive language and/or graphical icons, which prohibit illegal dumping at public access points along channels and creeks within the project area, trailheads and parks. There are no channels and/or creeks within the redevelopment area. 2.C BMPs Applicable to Individual Priority Project Categories The Bob Baker VW/Subaru Extension Project consists of a redevelopment of an existing impervious site. The project is an extension of an existing building, the repaying of asphah, and the addition of six new kiosks unto an already impervious area. The total approximate area is 18,000 sqf. The City of Carisbad Storm Water Standards labels this project under "Significant Redevelopment". However, based on the Storm Water Requirements Applicability Checklist (located in Appendix A of this report), the Bob Baker VW/Subaru Extension Project does not fall under the "Priority Project BMP Requirements" category. The project does however fall under the "Standard Permanent Storm Water BMP Requirements", which requires the implementation of sight and source design BMPs. However, the Bob Baker VW/Subaru Extension Project will incorporate a treatment control BMP to treat the runoff prior to discharging into the public storm drain. Therefore, the "Standard Permanent Storm Water BMP Requirements" will be met. 2.C Treatment Control "Treatment Control (Structural) BMP" means any engineered system designed and constructed to remove pollutants from urban runoff. Pollutant removal is achieved by simple gravity settling of particulate pollutants, filtration, biological uptake, media adsorption or any other physical, biological, or chemical process. The following discussion identifies the treatment control BMPs from Section II.2.C of the Storm Water Standards manual that is proposed for the project. Based on Table 5.1 - Anticipated and Potential Pollutants Generated By Land Use Type, the project is anticipated to generate the following pollutants of concern: Heavy Metals, Trash and Debris, and Oil and Grease. Therefore, these pollutants shall be given priority in selecting treatment BMPs. Table 5.3 of the Storm Water Standards manual provides a guide to treatment control BMP selection. The applicable portion of Table 5.3 is reproduced below (Table 5.3). Table 5.3 -Treatment Control BMP Selection Matrix**' Pollutant of Concern Treatment Control BMP Categories Biofilters Detention Basins Infiltration Basins'" Wet Ponds or Wetlands Drainage Inserts Filtration Hydrodynamic Separator Systems*^* Heavy Metals M M M H L H L Trash & Debris L H U U M H M Oil & Grease M M U u L H L (1) Including trenches and porous pavement. (2) Also known as hydrodynamic devices and baffle boxes. L: Low removal efficiency M: Medium removal efficiency H: High removal efficiency U: Unknown removal efficiency Sources: Guidance Specifying Management Measures for Sources of Nonpoinl Pollution in Coastal Waters (1993), National Stormwater Best Management Practices Database (2001), and Guide for BMP Selection in Urban Developed Areas (2001). Source: City of Carlsbad- Storm Water Standards, April 2003, Section III. 2 - Table 4 In selecting treatment control BMPs for the project, each of the following Treatment Control BMP categories from Table 5.3 were evaluated: • Biofihers - Biofiltration is a process that uses vegetation for the purpose of slowing water velocity and filtering out pollutants. Bioretention areas are landscape features that typically consist of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil, and plants. Storm water runoff is treated through a variety of physical, biological, and chemical treatment processes. Bioretention was not selected as the treatment BMP for the project because the landscaped areas could not practicably handle the drainage areas in a manner that would provide the required treatment, and ponding water in this urbanized area is not desirable. • Detention Basins - Extended detention basins have outiets that are designed to detain storm water runoff from a water quality design storm for a minimum period of time (e.g., 24 hours) to allow particles and associated pollutants to settle out. The required volume of an extended detention basin is calculated based on the runoff coefficient, depth of rainfall, and drainage area. Due to the area required for an extended detention basin, h was not a practicable option to provide water quality treatment and was not selected as a BMP for the project. Infiltration Basins - Infiltration basins are basins in which the majority of runoff from a water quality design storm is infiltrated into the soil rather than discharged to a surface water body. Infiltration basins are volume-based, but also have surface area restrictions that are based on volume, hydraulic conductivity, and drawdown time. In addition, infiltration basins are limited to areas with highly permeable soils and areas where the groundwater table is at least 10 feet below the ground surface. Due to the area required for an infiltration basin, it was not a practicable option to provide water quality treatment and was not selected as a BMP for the project. Wet Ponds or Wetlands - Wet ponds and constructed wetlands are basins that temporarily retain storm water runoff and maintain a permanent pool. Pollutant removal is achieved by biological uptake of pollutants, filtration by vegetation and by soil, and settiing. Wet ponds and constructed wetiands are volume-based, and the required water quality volume is three times that of extended detention basins due to the permanent pool. Due to the area required for wet ponds or wetlands, it was not a practicable option to provide water quality treatment and was not selected as a BMP for the project. It is also undesirable to have ponded water in this urbanized area. Drainage Inserts - Drainage inserts are inlet filter inserts that are screening devices that remove trash, debris, and some sediment from runoff and may contain sorbent material designed to remove oil and grease as well as other pollutants. There are numerous designs for drainage inserts that are marketed by several manufacturers. Drainage inlet filter inserts (with sorbent material added) were selected for the project because they are the most practicable in terms of constructibility, maintenance accessibility and cost when compared with other BMPs. • Filtration - Filtration devices contain filter media that removes pollutants from runoff through absorption or adsorption. Filtration systems may be open beds such as a sand filter or organic filter, or manufactured units of filter media contained within constructed vauhs. Filtration devices were not selected for the project because they are not the most practicable for the project in terms of constructibility, maintenance accessibility, and cost when compared with other BMPs. • Hydrodynamic Separator Systems - Hydrodynamic separators 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 efficientiy settle out. Hydrodynamic separators were not selected for the Bob Baker VW/Subaru Extension Project because they are not the most practicable for the project in terms of constructibility, maintenance accessibility, and cost when compared with other BMPs. Pursuant to the above discussion of each category of BMPs, the following BMPs are chosen to treat the pollutants of concern to the maximum extent practicable (MEP): Drainage inlet filter inserts, with sorbent material added Drainage inlet filter inserts were selected because drainage inserts are the most practicable solution for the project characteristics, location, and targeted pollutants. Drainage inlet filter inserts (with sorbent material added) reduce sediment, trash, debris, oil and grease from the flow as well as other pollutants that attach to sediment (such as heavy metals). The design of these BMPs will be discussed in more detail in the following Section 6.0. 6.0 PERMANENT STORM WATER BMP In order to meet the Municipal Permit requirements, the project will include installation of an inlet filter insert with sorbent material in the existing 10.0-foot San Diego Regional Standard Type B curb inlet located in Paseo Del Norte approximately 60 feet downgradient from the site. The location of the proposed inlet filter insert is shown on the exhibit entitled, "Site Plan for Bob Baker VW/Subaru", located in Map Pocket 1. The inlet filter insert is a flow-based BMP. A detail of the inlet filter insert is provided in Appendix B. The inlet filter insert must be capable of treating the required treatment flow for the area of the project site draining to the inlet. The required treatment fiow is calculated using flow-based numeric sizing criteria from the Municipal Permit. Appendix C provides calculations for treatment flow requirements for the project based on the following numeric sizing criteria from Section III.2.D(i) of the Municipal Permit: the maximum flow rate of runoff produced from a rainfall intensity of 0.2 inch of rainfall per hour. The area of the project that is being disturbed is approximately 18,000 square feet (0.4 acres). The total area of the Bob Baker VW/Subaru site is approximately 2.8 acres. Based on the numeric sizing criteria described above, the required treatment flow rate for the Bob Baker VW/Subaru site is 0.5 cubic feet per second (cfs). However, due to the location of the inlet filter insert in the public right-of-way the total treatment area for tiie inlet is approximately 11.4 acres. Therefore, the treatment flow for the inlet in Paseo Del Norte is 2.2 cfs. Additional calculations are provided in Appendix C to demonstrate that tiie inlet filter insert has the hydraulic capacity to treat 2.8 cfs. Therefore, the inlet filter insert proposed with this expansion project will treat fiature expansion at the site (and the adjacent property tributary to the sump inlet). 7.0 ANTICIPATED MAINTENANCE CONDITION(S) Following the completion of the project, die owner will be responsible for properly disposing of waste material from within the project site, maintaining landscaped 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. All post-construction BMPs will be maintained by the owner. The City of Carisbad will not be required to maintain any of the proposed BMPs associated with this project. Typical Maintenance Procedures for Treatment Control BMPs The maintenance procedure for servicing drainage inlet filter inserts with sorbent material typically includes contracting the maintenance cleaning/waste removal through a provider of those services. Drainage inlet filter insert manufacturers often offer servicing for their own facihties, however, maintenance services are also offered through a variety of other manufacturers and cleaners. The frequency of maintenance required is site and drainage area specific. The unit should be inspected periodically to assure the condhion is adequate to handle anticipated runoff. Initially following the installation of the new treatment BMP, it is important to check that the unit is functioning properly and to measure the amount of deposition occurring from specific storm events. At a minimum, inspections should be made on a monthly basis and after every storm event to check that the unit is frmctioning properly and whether die unit requires servicing at that time. Based on these inspections, it may be necessary to adjust the frequency of scheduled inspections and maintenance cleanings. It is important to note that for the purpose of this WQTR, anticipated maintenance costs and the frequency of servicing (as discussed below for "Anticipated Maintenance Cost of Post-Construction Structural BMPs") are approximated and do not reflect the periodic inspections that are necessary to determine the actual frequency that site specific unit will require. specific to the drainage inlet filter inserts provided by Bio Clean Environmental Service, Inc., service procedures include the removal of the man hole, removing the drainage inlet filter insert, properly disposing of the waste, replacing the hydrocarbon absorption boom (sorbent material), returning the filter to its secure position, returning the man hole to its original position, and reporting on debris and condition of filters for the maintenance service. Anticipated Maintenance Cost of Post-Construction Treatment Control BMPs Refer to Appendix D of this WQTR for a summary of the approximate maintenance costs associated with the proposed post-construction treatment control BMPs. The annual maintenance costs provided in Appendix D assume that the structural BMPs will be serviced four times a year (quarterly). Also, the sorbent material is required to be replaced twice a year. However, periodic inspections should be made to ensure the unit is frmctioning properly and that the frequency of maintenance does not need to be adjusted (as described above in "Typical Maintenance Procedures for Treatment Control BMPs"). It is important to realize the annual maintenance costs provided within this report are preliminary approximations, which do not reflect the actual frequency of service that the installed unit may require. It is important to note that a variety of vendors distribute, install, and maintain these types of treatment facilities and may offer significantly different costs associated with each unit than those provided within this report. Responsible Party for Maintenance and Funding of Structural BMPs The owner of the Bob Baker VW/Subaru Extension Project will be responsible for compliance with the City of Carlsbad Storm Water Standards, (which covers compliance for the Municipal Permit issued by the San Diego Regional Board). Specifically, the owner of Bob Baker VW/Subaru Extension Project will be responsible during construction and post-construction BMPs while the project site is under construction and will maintain all responsibility for the fimding of the fiature maintenance for all post-construction BMPs when construction of the project is completed. 8.0 SUMMARY The project will conform to applicable NPDES requirements during and after construction. The project will meet tiie requirements during construction by incorporating temporary BMPs for control of sediment and non-visible pollutants. The completed project will incorporate an inlet filter insert to meet the applicable requirements of the Municipal Permit. The inlet filter insert is a fiow-based BMP and has the hydraulic capacity to treat the amount of fiow required for the project based on numeric sizing criteria established in the Municipal Permit. Because the project drains into an existing municipal storm drain system, and because the overall peak discharge at the property boundary is not expected to increase as a result of the project, the project is not expected to increase downstream erosion. APPENDIX A Storm Water Requirements Applicability Checklists and Forms Prepared By: DCB:FL:nd/Report/14l40.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 storm Water Standards 4/03/03 Part D: Determine Construction Site Priority in accordance witli the IVIunicipal Permit, each construction site with construction Storm water BMI^ requirements must be designated with a priority: high, medium or low ^.P^WPPP n!^^^^^^ be conipleted 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 tvoe of activities necessary to complete the construction and any other extenuatinq circumstances that may pose a threat to water quality. The City reserves the riqht to adjust the pnonty of the projects both before and during construction [Note- The construction pnonty does NOT change construction BMP requirements that apolv to projects: all construction BMP requirements must be identified on a case-bv-case basis. The construction priority does affect the frequency of inspections that will be req"uirements^] ^^^^ °" construction BMP • A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy season 2) Projects 5 acres or more. 3) Projects 5 acres or more within or directly adjacent to or discharging directly to a coastal lagoon or other receiving water within an environmentally sensitive area Projects, active or inactive, adjacent or tributary to sensitive water bodies B) Medium Priority 1) Capital Improvement Projects where grading occurs, however a Storm Water Pollution Prevention Plan (SWPPP) is not required under the State General Construction Permit (i.e., water and sewer replacement projects, intersection and street re-alignments, widening, comfort stations, etc.) 2) Permit projects in the public right-of-way where grading occurs, such as installation of sidewalk, substantial retaining walls, curb and gutter for an entire street frontage, etc. , however SWPPPs are not required. 3) Permit projects on private property where grading permits are required however, Notice Of Intents (NOIs) and SWPPPs are not required. • C) Low Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop Installations, street light installations, etc. 2) Permit projects in the public right-of-way where minimal to no grading occurs such as pedestrian ramps, driveway additions, small retaining walls, etc. 3) Permit projects on private property where grading permits are not required, such as small retaining walls, single-family homes, small tenant improvements, etc. 32 I L C i: i: r lite llH i: i: Storm Water Standards 4/03/03 Part 8: Determine Standard Permanent Storm Water Requirements. Does the project propose: ^' ^^""sidewS^ ^'^^'^ ^® "-ooftops, roads, parking lots, driveways, paths and 2. New pervious landscape areas and irrigation systems?" ' Permanent structures within 100 feet of any natural water body? Trash storage areas?' ' ' 5. Liquid or solid material loading and unloading areas? 6. Vehicle or equipment fueling, washing, or maintenance areas? 7. Require a General NPDES Pemiit for Storm Water Discharges Associated with Industnal Activities (Except construction)?* Yes No 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? Any grading or ground disturbance during constructionT 10. Any new storm drains, or alteration to existing stomr drains? To find out if your project is required to obtain an individual General NPDES Pemiit for Storm Water Discharges Associated with Industrial Activities, visit the State Water Resources Control Bo™b site at, www.swrcb.ca.gov/stormwtr/industrial.html Section 2. Construction Storm Water BMP Requirements: If the answer to question 1 of Part C is answered "Yes," your project is subject to Section IV Construction Storm Water BMP Performance Standards," and must prepare a Storm Water Pollution Prevention Plan (SWPPP). If the answer to question 1 is "No " J °^ remaining questions is "Yes," your project is subject to f wT o .p^"^*'^^*'^" Storm Water BMP Performance Standards," and must prepare a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No" your project is exempt from any construction storm water BMP requirements If any of the answers to the questions in Part C are "Yes," complete the construction site prioritization in Part D, below. mm Would the project meet any of these criteria during construction? Yes No mm 1. Is the project subject to Calffomia% statewide General NPDES Permit for Storm Water Discharges Associated With Construction Activities? 'ii. Does the proiect oroDOse aradina nr <tn\\ Hicturhanr^ao •mm fjivfj\j.^\^ \ji ami uiotUiPgncs f 3. Would stonri w^teror urban runoff have the potential to contact any portion of the construction area, includinq washing and staqinq areas'? 1^ 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)? m 31 L L L L L I I I I 1 i i I i I Storm Water Standards 4/03/03 VI. RESOURCES & REFERENCES APPENDIX A STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST Complete Sections 1 and 2 of the following checklist to determine your project's permanent and construction storm water best management practices requirements This form must be completed and submitted with your permit application. Section 1. Permanent Storm Water BMP Requirements: If any answers to Part A are answered "Yes," your project is subject to the "Priority Project Permanent Storm Water BMP Requirements," and "Standard Permanent Storm Water BMP Requirements" in Section III, "Permanent Storm Water BMP Selection Procedure" in the Storm Water Standards manual. If all answers to Part A are "No," and any answers to Part B are "Yes," your project is only subject to the "Standard Permanent Storm Water BMP Requirements" If every question in Part A and B is answered "No," your project is exempt from permanent storm water requirements. Part A: Determine Prioritv Project Permanent Storm Water BMP Requirements. Does the project meet the definition of one or more of the priority proiect categories?* 1 • Detached residential development of 10 or more units 2. Attached residential development of 10 or more units 3. Commercial development greater than 100,000 square feet 4. Automotive repair shop 5. Restaurant 6. 7. Steep hillside development greater than 5,000 square feet Project discharging to receiving waters within Environmentally Sensitive Areas ' —J -J — ^•""a wf^Lx^i^ iririLiiiM i-iIvin^ijjinrmdijy ocribiuvtg rtieas 8. Parking lots greater than or equal to 5,000 ft' or with at least 15 parking spaces and potentially exposed to urban runoff 9. Streets, roads, highways, and freeways which would create a new paved surface that is 5,000 square feet or greater Yes No * Refer to the definitions section in the Storm Water Staridards for expanded definitions of the prioritv project categones. ' Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered pnonty projects. Parking lots, buildings and other structures associated with utility projects are pnonty projects if one or more of the criteria in Part A is met. If all answers to Part A are -^o? continue to Part B. 30 storm Water Standards 4/03/03 APPENDIX B DRAFT ENVIRONMENTALLY SENSITIVE AREAS WITHIN THE CITY OF CARLSBAD Environmentally Sensitive Areas / - Major Road$ [ ] Carisbad City Boundary HH Environmentally Sensitive Areas j./cflrgisJ/producls/planiiinartS\1 O^/EnvSens Areas 34 APPENDIX B Detail of Inlet Filter Insert - Bio Clean Curb Inlet Basket Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 - —.L-.t >-J^I^^^X^^^^^T^^^- BIO CLEAN ENVIRONMENTAL SERVICES, INC. PO Box 869 0<»an8lda.GAaa040 Offioa: (780) 433-7640 Fax: (760)43^176 w«w.bk)oteanenvfconmental.not THE CAUFORNIA CURB SHEIP BASKET WATER CLEANSING SYSTEM HjGH CAPACITY CURB IM FT RASKFT TTie Curb Shelf Basket Shelf waer Cleaning System Hgurel Details Of Shelf System (Dimensions will vaiv) RQurea f^J^^P CANISTER SQUARF RJOWHATE Tcp-Skto Contar-Skto BcAim-aiii TOTAL 80 isoias tSSJBO eai4 SLfiO 11^ 2081 Zfl6 3.17 2.11 11J6S NOTES: I. BeCentad RanwuB thrauQh manholB iMIhQU entry • —-Jcovefaoe a Shetf qfltonaiichadlocairthrt^jH^^ noncorrosltfBhamDwre. jwrtne fiwdaflhanalaiB, gel aaw Figurea nwrtatooaphwhydrocai^ Boom is nwunfrighttdware. under APPENDIX C Calculations for On-Site Water Quality Treatment Flow Requirements And Treatment Capacity of Inlet Filter Insert Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 RICK ENGINEERING COMPANY 2^/7 /or 5620 Friars Road • San Diego, California 92110-2596 • (619) 291-3588 • www.rickengineering.com mm 0=3.^ ^-Z-.U V>*o,5' C^nO ^ZTT ^ U>.%%' L" ^j^c ^ S-IH APPENDIX D Approximate Costs for Treatment Control BMPs Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 Bob Baker VW/Subaru Extension Proiect Anticipated Maintenance Cost Unit Type* instaiiation Costs IVIaintenance Cost*" The California Curb Shelf Basket Water Cleansing System High $890,00 $600.00 Capacity Curb Inlet Basket 'Maintenance cost is a yearly total based on a quarterly maintenance schedule (4-times per year) APPENDIX E Location Map for Bob Baker VW/Subaru Project in Hydrologic Basin 904.40 Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05 .Vis • "- PCEANSIDE I? Scuth Oceanside CarisbacT, St Beach O •-enter. . iiL^i/.Y IVn'r-lo, i Wolltard ^ Pontol SoOth Carlsbad Sep ,«ster. ftve^isf FIATS . 11 L^Ir MOUNUIN •J IpAN PA^UAL • IR / (;c £OOS--i.»-..-^% ^'-U - 'owwhouse /-iJ ^ \ I f. A o I • ^ I "V \ \ Leacadia\ StSeach .MoonHghe Stiite Btachl San Alejj St Beach „ 0»ticNff.b)i-the-Se«^ Carditt' Patfogfyirjsojp^ ' J) O^^' St Beach \ Solana Beachv -J ^^^^ ^RcAeTV""-ri^K 1 ; ^\.WaterTafit^^^^iT, vetwy^ V \r\'' D, ^ Cem Pasqual MOUNTAIN ^1 .WT „ > Jo/la Vaf/e) '^Vfifery l[arnDna_ 1393 WOoijSON MOtiNlail iLoikout tower s JtackT Del MarV Cem ,,,1 CAfcMfl WOUNMfN AOC MTNJ (67) :?696 Tower Wal z' < LLI I I I II 1 1 1 Location Map For Bob Baker VW/Subaru Project in Hydrologic Basin 904.40 MAP POCKET Site Plan for Bob Baker VW/Subaru Prepared By: DCB:FL:nd/Report/14140.003 Rick Engineering Company - Water Resources Division 05-24-02 Revised: 3-31-05