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l <br /> Mr. Kenneth Olds � <br /> November 15, 1988 <br /> 202/799-5055 <br /> Page 2 <br /> collected in June 1987 indicated northeastward groundwater flow <br /> direction. <br /> Another round of groundwater monitoring and sampling was <br /> carried out on November 12, 1987. The water samples were <br /> analyzed for STEX and TPH as gasoline concentrations. For sake <br /> of completeness, the groundwater monitoring data is included in <br /> Table 1 (Appendix II) . The water table is contoured on Figure 2, <br /> and the laboratory results are summarized in Table 2. The <br /> estimated groundwater flow direction in November 1987 was similar <br /> to that in June 1987, TPH as gasoline concentrations decreased <br /> in the five-month period to 4,300 ppb in MW-2, and no detectable <br /> hydrocarbons were found in the analyzed water samples collected <br /> from MW-3 through MW-5. <br /> In a letter dated August 26, 1988, GTI presented a proposal <br /> and cost estimate for the continuing subsurface investigation at <br /> the site. The proposed work scope was designed to provide <br /> updated hydrogeologic information necessary to proceed with the <br /> problem assessment phase of the investigation as required by the <br /> California Regional Water Quality Control Board - Central Valley <br /> Region (CRWQCB-CVR) . <br /> The work steps carried out during September and October, <br /> 1968 included the following: <br /> Monitoring of the five monitoring wells to determine <br /> water levels. <br /> Collection of water samples from each monitoring well. <br /> The wells were purged prior to sampling to insure <br /> representative formation water was obtained for <br /> analyses. <br />