SOIL INVESTIGATION McLAREN BIKE SKILLS PARK SAN FRANCISCO, CALIFORNIA

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1 FUGRO CONSULTANTS, INC. SOIL INVESTIGATION McLAREN BIKE SKILLS PARK SAN FRANCISCO, CALIFORNIA Prepared for: CITY OF SAN FRANCISCO RECREATION AND PARKS DEPARTMENT JUNE 2013 Fugro Project No

2 FUGRO CONSULTANTS, INC Broadway, Suite 440 Oakland, California Tel: (510) Fax: (510) June 28, 2013 Project No City of San Francisco Recreation and Parks Department 30 Van Ness Avenue, 5th Floor San Francisco, California Attention: Subject: Ms. Alexis Ward Soil Investigation, McLaren Bike Skills Park, San Francisco, California Dear Ms. Ward: With this letter Fugro Consultants, Inc. presents the results of the Soil Investigation completed at the McLaren Bike Skills Park (Site) located on the north side of Sunnydale Avenue across from 2055 Sunnydale Ave, San Francisco, California This work was authorized on DPW Order No. 178,664, DPW Job No. 3217V, and CSO No. FGW 17. Our findings, opinions, conclusions, and recommendations are based on applicable standards of our profession at the time this report was prepared. We appreciate the opportunity to be of continued service to the City of San Francisco. If you have any questions or require additional information, please call either of the undersigned at (510) Sincerely, FUGRO CONSULTANTS, INC. Michael D. D Anna, Senior Staff Geologist Glenn S. Young. P.G. LEED AP Principal Geologist Copies Submitted: (3 hardcopies and 1 pdf on CD) Addressee (1 hardcopy and 1 pdf on CD) Stanley DeSouza, SFDPW SAR A member of the Fugro group of companies with offices throughout the world.

3 City of San Francisco Recreation and Parks Department June 2013 (Project No ) CONTENTS Page EXECUTIVE SUMMARY INTRODUCTION SITE DESCRIPTION SITE ASSESSMENT ACTIVITIES Test pit Activities SUBSURFACE CONDITIONS CHEMICAL TESTING PROGRAM RESULTS OF ANALYSES Results of Chemical Analysis - Soil Fill Native Soil CONCLUSIONS AND RECOMMENDATIONS LIMITATIONS... 7 TABLES Tables Summary of Analytical Results Soil... 1 PLATES Plate Vicinity Map... 1 Site Plan... 2 APPENDICES APPENDIX A APPENDIX B LOGS OF TEST PITS TP-1 THROUGH TP-10 LABORATORY ANALYTICAL REPORTS G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc i

4 City of San Francisco Recreation and Parks Department June 2013 (Project No ) EXECUTIVE SUMMARY This summary is not to be read as a standalone document. The report shall be read in its entirety. The reader must review the detailed information provide in the accompanying text. The interpretation, use, and conclusion resulting from the data contained in this report are the responsibility of the reader. This report presents the results of Soil Investigation conducted by Fugro Consultants Inc., (Fugro) completed at the McLaren Bike Skills Park (Site) located north of Sunnydale Avenue across from 2055 Sunnydale Avenue, in San Francisco, California. We understand that the San Francisco Recreation and Parks Department (SFRPD) is considering developing this vacant land into a bike skills park. Preliminary estimates provided by SFRPD indicate that up to 28,125 cubic yards of fill material may be present at the Site. The purpose of this investigation is to characterize potential contaminant conditions in shallow fill that may be reused during construction at the Site. Results of this investigation will be used by the SFRPD to evaluate environmental conditions of fill at the Site prior to construction. Fugro s investigation included the collection and analysis of soil samples from ten test pits, TP-1 through TP-10. In general, subsurface soil conditions in Test Pit TP-1 through TP-10 encountered 1 to 9 feet of fill comprising alternating layers of gravel, clay, and sand. The fill was underlain by alternating layers of sand and clay with gravel to the maximum depth explored of 10 feet below ground surface (bgs). There were no PID readings detected in fill or soil samples collected at the Site. For the fill soil samples obtained from the Site, analyses detected no Total Petroleum Hydrocarbons as gas (TPHg), Volatile Organic Compounds (VOCs), Semi-Volatile Organic Compounds (SVOCs), or asbestos in any of the samples analyzed. Analyses detected TPH as diesel (TPHd) in all 10 samples at concentrations ranging from 4.1 mg/kg to 630 mg/kg, with only one sample (TP-4@0.5 ) exceeding the Tier 1 Environmental Screening Level criteria (ESL) of 100 mg/kg. Analyses detected TPH as motor oil (TPHmo) in all 10 samples analyzed at concentrations ranging from 3.3 mg/kg to 1,200 mg/kg, with only one sample (TP-4@0.5 ) exceeding the Tier 1 ESL of 500 mg/kg. The elevated TPHd and TPHmo concentrations detected in TP-4@0.5 appear limited to the near-surface and is not considered to be representative of overall fill conditions. The source of elevated TPHd and TPHmo in TP-4@0.5 is unknown but may be related to asphalt encountered at the surface of this location. Excluding results for TP-4@0.5, detected TPHd and TPHmo concentrations in fill were well below respective Tier 1 ESL criteria. Detected TPHd and TPHmo concentrations in sample TP-4@0.5 did not exceed respective construction worker ESL criteria. All detected metals concentrations are below their respective Total Threshold Limits Concentrations (TTLCs), one of the criteria used to classify a soil as hazardous. With the exception of arsenic, cobalt, and nickel in certain samples, all detected metals are below respective Tier 1 ESLs. Detected arsenic and cobalt concentrations are judged to be consistent with background values for the San Francisco Bay Area. The detected nickel concentration in sample TP-1@1.5 does not exceed construction worker ESL criteria. Because detected G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 1

5 City of San Francisco Recreation and Parks Department June 2013 (Project No ) chromium concentrations exceeded ten times the respective Soluble Threshold Limit Concentration (STLC) criteria, four samples and ) were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium in any of the samples analyzed. For native soil samples collected beneath the fill, analyses detected no TPHg or VOCs in any of the 5 samples analyzed. Analysis detected TPHd in all 5 samples at concentrations ranging from 4.6 mg/kg to 7.2 mg/kg, well below the Tier 1 ESL of 100 mg/kg. TPHmo was detected in all 5 samples analyzed at concentrations ranging from 4.1 mg/kg to 9.9 mg/kg, well below the residential ESL of 500 mg/kg. All detected metals concentrations are below respective TTLC criteria. With the exception of 2.9 mg/kg of arsenic detected in one sample (TP-9@5 ), none of the detected metals exceeded respective Tier 1 ESLs. Detected arsenic was judged to be consistent with background values for the San Francisco Bay Area. Because detected chromium and mercury concentrations exceeded ten times the respective STLC criteria, two samples (TP-1@4, and TP-9@5) were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium or mercury. Based on results of analyses and the proposed future land use as a recreational bike skills park, it is Fugro s opinion that the fill and native soil at the Site is considered nonhazardous and suitable for onsite reuse. In the event that SFRPD would like to dispose of fill and/or native soil from the Site, it will be suitable for disposal at a Class II or Class III landfill. If staining, chemical odors, underground storage tanks (USTs), or other signs of contamination and/or contaminated material are encountered during construction, the contractor should notify SFRPD of those conditions and appropriate precautions, investigation, and/or mitigation should be implemented. Copies of this report should be provided to the contractor performing construction at the Site. Additionally, the contractor should prepare a site-specific Health and Safety Plan (HSP) that notifies workers of the presence of detected chemicals at the Site, and describes the proposed soil handling procedures for their work, including but not limited to personal protective equipment, dust control, and field monitoring, as appropriate. G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 2

6 City of San Francisco Recreation and Parks Department June 2013 (Project No ) 1.0 INTRODUCTION This report presents the results of the soil investigation completed by Fugro Consultants, Inc., (Fugro) at the McLaren Bike Skills Park (Site) located north of Sunnydale Avenue, across from 2055 Sunnydale Avenue, in San Francisco, California. We understand that the San Francisco Recreation and Parks Department (SFRPD) is considering developing the land into a bike skills park. Preliminary estimates provided by SFRPD indicate that up to 28,125 cubic yards of fill material may be present at the Site. The purpose of this investigation is to characterize fill that may be reused during the proposed Site construction as well as to document potential contaminant conditions in subsurface fill and soil at the Site. Results of this investigation will be used by the SFRPD to evaluate environmental conditions of fill at the Site prior to construction. 2.0 SITE DESCRIPTION The Site encompasses approximately 3.2 acres and is located at the southwest corner of McLaren Park in San Francisco. The Site is owned by the City of San Francisco and is a recreational park that is operated by SFRPD. The Site is bordered by Gleneagles Golf Course to the north and Sunnydale Avenue to the south. 3.0 SITE ASSESSMENT ACTIVITIES Field activities were conducted using standard industry practices regarding worker health and safety, sample collection and handling, and chain-of-custody documentation. Prior to commencement of fieldwork, Fugro retained a private utility locator to clear all proposed Test Pit locations and alerted the Underground Service Alert (USA) at least 48 hours prior to intrusive field activities. Test Pit locations are shown on Plate TEST PIT ACTIVITIES Test pits were completed on May 14, 2013 under the supervision of Fugro s field personnel. CES, a State of California licensed contractor, excavated ten test pits, TP-1 through TP-10, to a maximum depth of 10 feet bgs using a backhoe. Upon completion, all test pits were backfilled with soil and restored to existing conditions. Fugro s field personnel logged each test pit in accordance with the Unified Soil Classification System (USCS) and screened soil samples in the field using a Photo-ionization Detector (PID) which measures the presence of organic vapor such as gasoline and solvents. Soil samples were collected using stainless steel tubes, sealed with Teflon sheets and plastic end caps. All soil samples were stored in an ice-chilled cooler pending delivery to the chemical testing laboratory. G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 3

7 City of San Francisco Recreation and Parks Department June 2013 (Project No ) 4.0 SUBSURFACE CONDITIONS Subsurface soil conditions in Test Pit TP-1 through TP-10 generally encountered fill consisting of alternating layers of gravel, clay, and sand to a maximum depth of 9 feet bgs. The fill is underlain by alternating layers of sand and clay with gravel to the maximum depth explored of 10 feet bgs. There were no PID readings detected in fill or soil samples collected at the Site. 5.0 CHEMICAL TESTING PROGRAM Selected soil samples were transported under chain-of-custody documentation to Advanced Technology Laboratories (ATL), a State of California-certified testing laboratory. To evaluate the shallow soil conditions. Fugro submitted one discrete sample of fill from each test pit and one discrete sample of the native soil from Test Pit TP-1, TP-2, TP-5, TP-7, and TP-9 for analysis. Selected soil samples were analyzed for some or all of the following: Total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015m/8020; Total petroleum hydrocarbons as diesel and motor oil using silica gel cleanup (TPHd and TPHmo), using EPA Method 8015m; 17 Title 22 metals, using EPA Methods 6010/7000 series; Asbestos CARB 435; Volatile organic compounds (VOCs) using EPA Method 8260; and Semi-volatile organic compounds (SVOCs) using EPA Method RESULTS OF ANALYSES Results of analyses on soil samples collected from the Site are summarized in Table 1. Copies of the laboratory reports with chain-of-custody documentation are presented in Appendix B. For the purposes of this report, results of analyses were compared to Total Threshold Limit Concentrations (TTLCs), one of criteria used to classify soil as a hazardous waste, Environmental Screening Levels (ESLs) for construction worker exposure scenarios, Tier 1 criteria established by SF RWQCB, and reported background metals concentrations in the Soil. 6.1 RESULTS OF CHEMICAL ANALYSIS - SOIL For the purposes of this report, we have summarized the analytical results by the following areas; fill and native soil, as discussed below Fill For the fill samples obtained from the Site, analyses detected no TPHg, VOCs, SVOCs, or asbestos in any of the samples analyzed. Analyses detected TPHd and TPHmo in all 10 samples. Excluding Sample TP-4@0.5, detected TPHd concentrations ranged from 4.1 mg/kg to 35 mg/kg, and TPHmo concentrations ranged from 3.3 mg/kg to 74 mg/kg, well below respective Tier 1 ESLs of 100 mg/kg and 500 mg/kg. The detected concentrations of TPHd and G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 4

8 City of San Francisco Recreation and Parks Department June 2013 (Project No ) TPHmo in sample exceeded respective Tier 1 ESLs; however, they are below their respective construction worker ESL criteria. The elevated TPHd and TPHmo concentrations detected in TP-4@0.5 appear limited to the near surface and are not considered to be representative of overall fill conditions. The source of the elevated TPHd and TPHmo is unknown but may be related to the presence of asphalt covering the surface at this location. All detected metals concentrations are below their respective TTLCs. With the exception of arsenic and cobalt in certain samples, all detected metals are below their respective ESLs for Tier 1 and a construction worker. Background arsenic concentrations in California soil typically exceed the established screening criteria, and background arsenic concentrations ranging up to 11 mg/kg are common. Fugro s investigation detected arsenic concentrations ranging from 2.9 mg/kg to 3.9 mg/kg, which we judge are consistent with reported background values. Background cobalt concentrations in California soil exceed the established screening criteria, and background cobalt concentrations ranging up to 47 mg/kg are common. Fugro s investigation detected cobalt concentrations ranging from 8.2 mg/kg to 28 mg/kg, which we judge are consistent with reported background values. Detected chromium concentrations in Samples 1.5, 3.5, and 3 exceeded ten times their respective Soluble Threshold Limit Concentration (STLC) criteria. Therefore, these samples were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium in any of the samples analyzed Native Soil For native soil samples collected beneath the fill, analyses detected no TPHg or VOCs in any of the 5 samples analyzed. Analysis detected TPHd in all 5 samples at concentrations ranging from 4.6 mg/kg to 7.2 mg/kg, well below the Tier 1 ESL criteria of 100 mg/kg. TPHmo was detected in all 5 samples analyzed at concentrations ranging from 4.1 mg/kg to 9.9 mg/kg, also well below the Tier 1 ESL of 500 mg/kg. All detected metals concentrations are below respective TTLC criteria. With the exception of arsenic, none of the detected metals exceeded respective ESL and/or background criteria. Detected chromium and/or mercury concentrations in Samples TP-1@4, and TP-9@5 exceeded ten times their respective STLC criteria. Therefore, these samples were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium or mercury in any of the samples analyzed. 7.0 CONCLUSIONS AND RECOMMENDATIONS Based on field observations and results of analyses, Fugro presents the following conclusions and recommendations. Fugro s investigation included the collection and analysis of 10 fill and 5 native soil samples from ten test pits completed to a maximum depth of 10 feet bgs. In general, subsurface soil conditions in Test Pit TP-1 through TP-10 encountered 1 to 9 feet of fill comprising alternating layers of gravel, clay, and sand. The fill was underlain by alternating G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 5

9 City of San Francisco Recreation and Parks Department June 2013 (Project No ) layers of sand and clay with gravel to the maximum depth explored of 10 feet below ground surface (bgs). There were no PID readings detected in fill or soil samples collected at the Site. For the fill soil samples obtained from the Site, analyses detected no TPHg, VOCs, SVOCs, or asbestos in any of the samples analyzed. Analyses detected TPHd and TPHmo in all 10 samples. Excluding Sample detected TPHd concentrations ranged from 4.1 mg/kg to 35 mg/kg, and TPHmo concentrations ranged from 3.3 mg/kg to 74 mg/kg, well below respective Tier 1 ESLs of 100 mg/kg and 500 mg/kg. The detected concentrations of TPHd and TPHmo in sample TP-4@0.5 exceed their respect Tier 1 ESLs; however, they are below their respective construction worker ESl criteria. The elevated TPHd and TPHmo concentrations detected in TP-4@0.5 appear limited to the near surface and are not considered to be representative of overall fill conditions. The source of the elevated TPHd and TPHmo is unknown but may be related to the presence of asphalt covering the surface at this location. All detected metals concentrations are below their respective TTLCs. Except for nickel in TP-1@1.5 all detected metals were below either their respective Tier 1 ESLs, construction woker ESLs, or consistent with background values for the San Francisco Bay Area. Because detected chromium concentrations exceeded ten times the respective Soluble Threshold Limit Concentration (STLC) criteria, four samples (TP-1@1.5, TP-2@1.5, TP-8@3.5, and TP-9@3 ) were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium in any of the samples analyzed. For native soil samples collected beneath the fill, analyses detected no TPHg or VOCs in any of the 5 samples analyzed. Analysis detected TPHd and TPHmo in all 5 samples at concentrations below their respective residential ESL. All detected metals concentrations are below respective TTLC criteria, and were either below their respective ESLs for Tier 1 and a construction worker or were consistent with background values for the San Francisco Bay Area. Because detected chromium and mercury concentrations exceeded ten times the respective STLC criteria, two samples (TP-1@4, and TP-9@5) were analyzed for soluble metals using the WET and TCLP Method analysis. Analyses detected no soluble chromium or mercury. Based on results of analyses and the proposed future land use as a recreational bike skills park, it is Fugro s opinion that the fill and soil at the Site is considered non-hazardous and suitable for onsite reuse. In the event that SFRPD would like to dispose of fill and/or native soil from the Site, it will be suitable for disposal at a Class II or Class III landfill. If staining, chemical odors, underground storage tanks (USTs), or other signs of contamination and/or contaminated material are encountered during construction, the contractor should notify SFRPD of those conditions and appropriate precautions, investigation, and/or mitigation should be implemented. Copies of this report should be provided to the contractor performing construction at the Site. Additionally, the contractor should prepare a site-specific Health and Safety Plan (HSP) that notifies workers of the presence of detected chemicals at the Site, and describes the proposed soil handling procedures for their work, including but not limited to personal protective equipment, dust control, and field monitoring, as appropriate. G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 6

10 City of San Francisco Recreation and Parks Department June 2013 (Project No ) 8.0 LIMITATIONS Fugro has prepared this report in a professional manner, using that degree of skill and care exercised for similar projects under similar conditions by reputable and competent environmental consultants. Fugro shall not be responsible for conditions or consequences arising from relevant facts that were concealed, withheld, or not fully disclosed at the time the report was prepared. Fugro also notes that the facts and conditions referenced in this report may change over time and the conclusions and recommendations set forth herein are applicable only to the facts and conditions as described at the time of this report. Fugro believes that conclusions stated wherein to be factual, but no guarantee is made or implied. This report has been prepared for the benefit of the City of San Francisco Recreation and Parks Department. The information contained in this report, including all exhibits and attachments, may not be used without the consent of Fugro West, Inc. G:\jobdocs\ McLaren Bike Skills Park\Final Docs\Anna\Rpt June2013_Final.doc 7

11 TABLES

12 City of San Francisco May 2012 (Project No ) Table 1 Summary of Analytical Results - Discrete Soil Samples McLaren Park San Francisco, California Sample ID Analyte Units TP-1@1.5 TP-1@4 TP-2@1.5 TP-2@7 TP-3@1.5 TP-4@0.5 TP-5@1 TP-5@5 TP-6@2 TP-7@1 TP-7@5 TP-8@3.5 TP-9@3 TP-9@5 TP-10@1 Tier 1* Environmental Screening Levels Matrix Fill Native Fill Native Fill Fill Fill Native Fill Fill Native Fill Fill Native Fill Hydrocarbons TPHg mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < ,800 NE NE NE TPHd mg/kg NE NE NE TPHmo mg/kg , ,000 NE NE NE VOCs All VOCs µg/kg ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND varies varies varies varies NE SVOCs All SVOCs µg/kg ND -- ND -- ND ND ND varies varies varies varies NE Title 22 Metals Antimony mg/kg <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 < NE Arsenic mg/kg 3.9 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < < c Barium mg/kg ,000 10,000a Beryllium mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < NE Cadmium mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <7.0 <1.0 <1.0 < NE Chromium mg/kg , ,500+ NA 100+ Chromium (WET) mg/l <1.0 <1.0 < < <1.0 <1.0 < NE NE NA 5.0 NE Chromium (TCLP) mg/l <0.05 <0.05 < < <0.05 <0.05 < NE NE NA 5.0 NE Cobalt mg/kg , Copper mg/kg ,000 2, Lead mg/kg , Mercuryr mg/kg < <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 < < NA NE Mercury (WET) mg/l -- < NE NE NA 0.2 NE Mercury (TCLP) mg/l -- < NE NE NA 0.2 NE Molybdenum mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < ,500 3,500b 350 NE Nickel mg/kg ,100 2, Selenium mg/kg 1.5 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < , NE Silver mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < , NE Thallium mg/kg <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 < NE Vanadium mg/kg ,500 2, Zinc mg/kg ,000 5, Asbestos Total Asbestos % ND -- ND -- ND ND ND -- ND ND -- ND ND -- ND NE NE 1% NE NE Notes Construction Worker** California Regulatory Limits VOC = Volatile Organic Compounds; detected analytes only *** = Analysis of Background Distributions of Metals in the Soil at Lawrence Berkeley National Laboratory dated June 2002, Revised April 2009, TPHg = Total Petroleum Hydrocarbons as Gasoline background metals are compared to the 95th percentiles TPHd = Total Petroleum Hydrocarbons as Diesel a = Barium does not include barium sulfate TPHmo = Total Petroleum Hydrocarbons as Motor Oil b = Molybdenum does not iclude molybdenum disulfide mg/kg = Milligrams per kilogram c = Established Background Arsenic in Soil of the Urbanized San Fracisco Bay Region, µg/kg = Micrograms per kilogram December 2011, Arsenic compared to the 99th percentile mg/l = Milligrams per liter -- = Not Tested = Exceeds Tier 1 ESL Criteria <25 = Not detected above laboratory reporting limit = Exceeds 10 X the STLC NE = Not Established = Exceeds California Hazardous Waste Extraction Test (WET) Criteria NA = Not Applicable = Exceeds TTLC and/or RCRA TCLP Hazardous Waste Criteria + = Assumes Chromium Total ++ = Assumes Chromium III ESL = Environmental Screening Levels, RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and Goundwater -- May 2013 * = Tier 1 ** = Table K-3: ESL for Direct Exposure Soil Screening Levels Construction/Trench Worker Exposure Scenario TTLC STLC Background Metals***

13 PLATES

14 City of San Francisco June 2013 (Project No ) PROJECT SITE M:\Drafting\JOBFILES\2013\ \Drawings\A vicn.dwg :25am BASE MAP SOURCE: Aerial photograph provided by Google Earth Pro, NORTH FEET VICINITY MAP McLaren Bike Skills Park San Francisco, California PLATE 1

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16 APPENDIX A LOGS OF TEST PITS TP-1 THROUGH TP-10

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