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4.2 Initial Subsurface Investigation In October 1991, a RESNA geologist supervised the drilling of one angle and five vertical soil borings to assess subsurface conditions at the project site. Analytical results of collected soil samples indicated that gasoline impacted soils were limited laterally to a relatively small area near the former gasoline fuel storage tanks, and that diesel impacted soils existed beneath the former diesel fuel storage tank The former gasoline tank pit was backfilled with crushed rock ' in September 1993 Analytical results are summarized in Table 1 and sample locations are shown on Plate 2 Bonng logs are included in Appendix I ' 4.3 Well Installation On March 2, 1992, RESNA installed groundwater monitoring well MW-1 to a depth of 85 feet ' below grade Laboratory analyses of samples collected from MW-1 indicated that near-water soils had been impacted by gasoline hydrocarbons in the vicinity of MW-1 Three additional groundwater monitoring wells (MW-2, MW-3 and MW-4) were installed in October 1993 No hydrocarbons were detected in any soil samples from these borings (Table 1) Analyses of groundwater samples indicated that potential dissolved petroleum hydrocarbon ' contamination was limited to a relatively small area near the former dispenser island Well locations are shown on Plate 3 Well logs are included in Appendix I Groundwater analytical ' results are summarized in Table 2. ' In October 1993, RESNA supervised the drilling of three borings which were completed as vapor extraction wells VW-1, VW-2 and VW-3 Locations of vapor extraction wells are shown ' on Plate 3 Soil samples collected from borings VW-2 and VW-3 contained low levels of petroleum hydrocarbon analytes (Table 1) I 1500471RFMRTSICAP 06%FNL 4