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1 Problem Assessment Report Page 6 Ranch Market,23569 South Santa Fe Road,Riverbank,CA November&,2000 characterization The auger steam cleaning water was retained and stored in one 55-gallon drum pending offsite disposal 4.2 Soil Sampling ' Soil samples were collected from four of the seven borings and at 5-foot Intervals, beginning at various depths as described above Samples were collected from the HSA borings using a 2 5-Inch O D split-spoon sampler, lined with three 2-inch-diameter by 6-inch-long brass ' sample tubes The split-spoon sampler was driven 18 inches ahead of the augers at each sample point Selected soil samples were field screened for hydrocarbon vapors using a PID Working under the supervision of a California registered geologist, SECOR's field geologist logged the soil samples using the Unified Soil Classification System (Appendix B) Copies of the field notes detailing the well installation are included in Appendix C ' Selected samples were sealed, labeled and placed on ice in an insulated container for transport under chain-of-custody manifest to Kiff Analytical LLC, a California state-certified analytical laboratory located in Davis, CA ' Soil samples submitted for laboratory analysis were chosen on the basis of PID readings, P rY Y 8 ' lithology, historical analytical results, and depth to groundwater observed in each boring Selected samples were analyzed using U S Environmental Protection Agency (EPA) method 8260B for BTEX, TPHg, and MtBE 10 4.3 Air Sparge and Soil Vapor Extraction Well Installation ' One air sparge well was installed in boring AS-1 using 2-inch-diameter, schedule 40 PVC blank casing and 0 020-inch-slot well screen with flush threads set from 40 to 45 feet bgs Six soil vapor extraction wells were installed in borings V-1 through V-6 using 2-inch-diameter, ' schedule 40 PVC blank casing and 0 020-inch-slot well screen with flush threads set from 13 to 30 feet bgs In all wells, a#3-sand filter pack was installed in the annulus from the bottom of each boring to at least 2 feet above the top of the well screen, followed by a well seal ' consisting of a 2-foot-thick hydrated bentonite layer overlain by neat cement to ground surface The bentonite layer was constructed above the water table with bentonite chips Each boring was then grouted using neat cement pumped through tremae up to grade Each ' well was secured by a locking expandable well cap and fitted with a traffic-rated well box set in concrete The groundwater in Well AS-1 was surged following the installation of the sand filter pack and prior to the installation of the bentonite seal Well completion details for the ' seven newly installed wells are presented in Table 2 and illustrated on the appropriate boring logs (Appendix B) File PAR-report doe SECOR International Incorporated I