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On November 18, 1999, Ramage Environmental supervised the drilling of one soil boring (SBA) to a depth of 83 feet, at the north end of the middle former LIST (Figure 2). Laboratory analysis of soil samples collected during drilling indicated that except for trace concentrations of.toluene, ethylbenzene and xylenes, impacted soil at this location is concentrated above 25 feet bgs. These soil sample results are summarized in Table 1 • Groundwater was encountered in SBA at a depth of 78.5 feet. Using a temporary well, groundwater was purged and sampled from SBA. Results of the laboratory analysis in'dicated that groundwater was impacted with 130 micrograms per liter(AgA) of TPH-as-gasoline, 1.9 gg/l of toluene, 1.4 ggA of ethylbenzene, and 9.5 gg/l of xylenes. Benzene, oxygenate compounds, and 1,2-dichloroethane (1,2-DCA)were not detected. These results are summarized in Table 2., On November 18, 1999, Ramage Environmental sampled groundwater from the on-site domestic well. The laboratory results, summarized in Table 3, indicate that the domestic well had not been impacted by gasoline constituent compounds. On January 6, 2000, Ramage Environmental documented the results of the drilling and sampling in Environmental Site Investigation Report. Due to the proximity of the domestic well to the impacted groundwater, Ramage Environmental recommended that three on-site monitoring wells be installed and sampled on a quarterly basis for at least one year, and that.a sensitive receptor survey be conducted. On January 27, 2000, PHS/EHD approved these recommendations and requested that this subject work plan be submitted. 7