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r h'� KLEINFELDER <br /> File No. 20-1008-52.A01 <br /> May 16, 1994 <br /> surface (bgs). Chemical analysis of the sample obtained revealed a concentration of 15,000 <br /> mg/kg Total Petroleum Hydrocarbons as diesel. <br /> Based on the concentrations of Total Petroleum Hydrocarbons as diesel (TPH-D) in the soil at a <br /> depth of 10 feet, further assessment is necessary to determine the full extent of diesel-affected <br /> soil. That proposed assessment is detailed in this document as follows. <br /> PROPOSED SERVICES <br /> Task A01 - Permitting and Pre-Field Activities <br /> It has been Kleinfelder's experience that this proposal contains sufficient detail and information <br /> to be submitted to the San Joaquin County Public Health Services Environmental Health <br /> Division (SJCEHD) to review and approve a boring/well permit. Kleinfelder can prepare a <br /> boring permit application, a proposed boring location map, and health and safety plan for <br /> submittal along with this proposal to SJCEHD. The permit must be approved prior to drilling <br /> the borings. Following obtaining approval from the SJCEHD, Kleinfelder will commence the <br /> actual field assessment. <br /> Task A02 - Drilling of Soil Boring <br /> Four soil borings will be advanced to a depth of approximately 20 feet below surface grade <br /> (bsg) to help define the diesel-affected soil in the former dispenser area. <br /> During the advancement of the boring, soil samples will be collected at 5-foot intervals, <br /> beginning at 15 feet, for lithologic classification and qualitative field screening. Lithologic <br /> classification will be based on the United Soil Classification System (USCS). Additionally, soil <br /> samples will be obtained for field screening with an organic vapor analyzer (OVA). The OVA <br /> measures ionizable compounds in air in parts per million by volume (ppmv). Soil samples will <br /> also be obtained for potential chemical analysis. At this time we propose to analyze only two <br /> soil samples from each of the borings. After collection, the soil samples will be labeled, <br /> logged on a chain-of-custody, and immediately stored in an iced cooler. The samples will be <br /> submitted to a State of California Certified and San Joaquin County subcontracted laboratory <br /> for the following analyses: <br /> • BTXE/TPH-G (EPA 8015M/8020M/5030) <br /> • TPH Diesel (EPA 8015 M/LUFT Manual) <br /> ETH:md 1E/94 <br /> Copyright 1994 Kleinfelder, Inc. Page 2 of 5 <br />