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i 32 Soil Vapor Survey ' In August 1992, a soil vapor survey was performed at the site (Canome, 1992b) Results of the soil vapor survey indicated that hydrocarbon vapors were present around the pump island area and did Inot extend laterally The results of the soil vapor survey are provided in Appendix A I3 3 Soil Borings In October 1992, a preliminary site assessment was conducted by Canine to further evaluate the subsurface conditions at the site This investigation involved drilling a total of seven soil borings (Wl through W7) On December 2, 1993, four additional soil borings (SB-1 to SB-4) were drilled ' by SEACOR to further define the lateral extent of petroleum hydrocarbons in the soil at the site ' All soil borings were drilled with a truck-mounted drill ng equipped with 6, 8 or 10-inch outside diameter(OD)hollow-stern augers Drilling operations were supervised by a geologist who visually described and lrthologically logged the soil samples in accordance with the Unified Soil Classification System The Canome and SEACOR drill logs are presented in Appendix B All augers and down-hole equipment were steam-cleaned between each boring and prior to leaving the site ' Soil cuttings generated during drilling operations were placed in 55-gallon containers, which were labeled and stored on-site for future disposal Vapor wells were installed in three of the borings and groundwater monitor wells were installed in four of the bonngs Soil borings that were not utilized for monitor or vapor extraction well installation were backfilled with cement grout Approximate locations of these borings and wells are shown on Figure 2 ' 34 Soil Sampling During drilling of the SEACOR bonngs, soil samples were collected every five feet using an 18-inch Ilong, 2-inch inside diameter split barrel sampler Soil samples were collected from the sampler in brass tubes and sealed with teflon tape, plastic caps and tape The soil samples were labeled with the appropriate borehole information, time and date of collection, and placed in cooled storage for subsequent transport and analysis at a State of California certified analytical laboratory Chain-of-custody procedures were followed at all times Selected soil samples were analyzed using I 110C1434PAR 4 S • N1 N0005-002-01 My 3 31 1 1 199994