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- 7 In Tune 1987, two soil borings g were drilled (MW4, MW5, Figure 4 ). One sail sample was collected from the 45-400t level of each boring; these samples did not contain levels of fuel a constituents above method detection limits (see Table 3) . In July 1989, three additional soil borings (Figure 5) were drilled in the area of the former product tank . field (SB6 SB7) and the waste oil tank - pits (SBS). Numerous soil samples col- lected from these borings did not contain TPH concentrations ._J greater than 1 .6 m k g/ g, or BTEX compounds greater than 0. 14 mg/kg n (Table 41 . Benzene was not detected in any of the soil samples at levels greater than the laboratory detection limit of 0.005 } Mg/kg. Routine OVA (FID) screening of all of the soil samples at .: the surface at the time of collection detected only low concen- trations of organic vapors ( 00 ppm) in SB6 between 30 and 55 feet, and in SB7 between 30 and 40 feet (lithologic logs, �I Appendix A). f j The results of the 1989soil anal sis - Y indicate that only low concentrations of fuel constituents are present in the soil section below the backfilled product and waste oil tank pits (see -' Table 4) . t Cadmium, chromium, and zinc values were within the range of con- centrations normally found in _ cla - rich Y sediments � t s USGS 1975) . 1 -5 SOIL VAPOR ANALYSES EA conducted a soil. vapor contaminant assessment (SVCA) at former Exxon RS 7-1050 during the months of November and December 1987. ^' Soil gas samples were collected from 11 locations on the site [ ]I (VI-VII , Figure 6}w , ;and headspace samples were taken from the i I five monitoring well.;. No significant hydrocarbon concentrations were detected in any of the soil vapor samples collected in the course of the SVCA: e42/71050/.7-90/tx $