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330 South Cherokee Lane TLP 3794-445 December 1, 1994 Page 2 According to a letter to you from the San Joaquin County Public Health Services Environmental Health Division (SJCEHD), dated February 3, 1994, one soil sample was collected beneath each UST and the analytical method used to analyze the soil samples was the head space method of analysis instead of United States Environmental Protection Agency (US EPA) method 8020. Based on this information, Twining understands that the SJCEHD has required that two soil samples be collected beneath the former location of each UST and that appropriate analytical methods be used to analyze the soil samples. E According to a sewn tter to you`frtim the SJCEHD, dated June,15t 19,94, pi ing associated with the former USTs was removed on April 22, 1994. According to att ynca _ Twining by you, analysis of soil sample #3, on the north side of the dispenser island along Lodi Avenue, detected 11,000 milligrams per kilogram total petroleum hydrocarbons as diesel (TPH— D), 680 mg/kg total petroleum hydrocarbons as gasoline(TPH—G), 2.3 mg/kg benzene, 16 mg/kg toluene, 9.8 mg/kg ethylbenzene, and 46 mg/kg total xylenes. Also, analysis of soil sample#4, at the east end of the same dispenser island detected trace concentrations of TPH—G,. ethylbenzene, and total xylenes. Analysis of soil samples #1, 2, and 5 through 14 did not detect TPH—G, benzene, toluene, ethylbenzene, or total xylenes (BTEX). SCOPE OF WORK The following scope of work is proposed. Task 1 - Work Plan and Permit Application Twining will conduct a site background investigation to obtain the information necessary to complete the field work. Health and Safety (H & S) Plans, work plans, and work schedules will be prepared according to San Joaquin County guidelines for each phase of work. Soil boring _ permits will be,obtaiped.from.the (SJCEHD). The project manager for this and subsequent tasks Task 2 — Site Field Work Twining proposes to drill six vertical soil borings to approximately 20 feet BSG, one angle soil boring to approximately 35 feet BSG,and two vertical soil borings to approximately 35 feet BSG. Twining proposes to use a CME 75 truck—mounted drill rig equipped with 6-5/8-inch diameter' hollow—stem augers. Soil samples will be collected at five—foot intervals beginning at five feet BSG. A Twining geologist will log the soils in accordance with the Unified Soil Classification System. Soil samples will be collected in brass or stainless steel sleeves, sealed, capped, and preserved on ice for shipment to Twining's California—certified laboratory in Fresno, California. Drill cuttings and decontamination rinsate will be contained on site in California Department of Transportation (DOT)—approved 55—gallon drums.