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Remedial Well and Soil Vapor Extraction System Installation Report 5 Ranch Market 23569 South Santa Fe Road Riverbank,CA November 27 2002 4.2 Soil Sampling Sol] samples were collected from 17 of the 24 wells at various depths as described above Samples were collected from the HSA borings using a 2 5-Inch O D split-spoon sampler The sampler was lined with three 2-inch-diameter by 6-inch-long brass sample tubes in wells S-7, S-12, S-13, and S-17 to retain soil samples for laboratory analysis 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 lee 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, and analyzed using U S Environmental Protection Agency (EPA) method 8260B for BTEX,TPHg, and MtBE 4.3 Soil Vapor Extraction and Ozone Sparge Well Installation Four soil vapor extraction wells were installed in borings V-7 through V-10 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 Twenty ozone sparge wells were installed in bonngs S-1 through S-20 using 0 75-inch-diameter, schedule 40 PVC blank casing attached to a 1 25-inch diameter ozone sparge screen 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 pellets Each boring was then grouted using neat cement pumped through the augers up to grade The four vapor wells were secured by a locking expandable well cap The sparge wells were capped with a removal 3/a-inch PVC slip cap The vapor and sparge wells were fitted with a traffic-rated well box set in a sand/grout slurry to allow easy removal by future subcontractors during remediation system installation Well completion details for the 24 newly installed wells are presented in Table 2 and illustrated on the appropriate boring logs (Appendix B) Morrow Surveying, a certified surveyor for the State of California, surveyed the locations of the newly installed wells The latitude and longitude of each well was surveyed according to Assembly Bill 2886 guidelines (Appendix D) 4.4 Waste Profiling and Disposal During the installation of the vapor extraction wells and sparge wells, soil cuttings were stockpiled near the northwestern corner of the property on visqueen and left onsite pending . profiling and disposal Five soil samples were collected from the stockpile and combined into two composite samples (SP-1 [ABC] and SP-2 [AB]) by the laboratory The samples were I\Ranch Market-Riverbaak\Reports\RB-Remed Well Install doe SECOR International Incorporated