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INC Area A is covered with an older asphalt surface that is approximately four inches thick I i and it is very probable that the shallow depth sample obtained by TMG (1992) and trench samples obtained by WZl are simply older asphalt that was cross-contaminated during the sampling procedure No further work to define the lateral or vertical extent of hydrocarbon impacted soak is warranted at this site 6.4 Area D Area D was investigated by WZI using previous TMG (1992) data to determine the subsurface extent and nature of soil reported by TMG to have been slightly impacted by heavy hydrocarbons and chlorinated hydrocarbons TMG drilled three shallow soil borings to a maximum depth of 6 5 feet and one soil boring to 16 5 feet in Area D Samples obtained from Boring D-4 had analytical results reported at a maximum of 11 . ppm of Total Petroleum Hydrocarbons as Diesel and 97 ppm Total Petroleum Hydrocarbons from a depth of approximately 10 to 11 5 feet Chlorinated hydrocarbons were found to be present in Boring D-3 at depths of 2 and 5 feet 1,1,1-Trichloroethene and Trichloroethene were present at maximum concentrations of 0 0093 and 046 ppm, respectively No other samples from the other three borings showed the presence of chlorinated hydrocarbons at detectable amounts WZI investigated Area D by drilling three shallow soil borings to a depth of 16 5 feet (Exhibit 15) Samples were collected at depths of 10-11 5 feet and 15 to 16 5 and submitted to an analytical laboratory Samples were tested using U S Environmental Protection Agency Test methods 8015 (modified), 8020, and 8240 The subsurface geology was recorded on individual boring logs depicted in Appendix IV Analytical results from the laboratory are depicted in Appendix V The subsurface geology was similar to that reported in borings from the Concrete Tank area and depicted in Exhibit 9 12270010 013 Page 23