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w <br /> • 20 FEBRUARY 1999 INVESTIGATION RESULTS Draft <br /> 1 Based on the findings of the previous investigations discussed in Section <br /> 10, the County and CVRWQCB requested that Heinz perform additional <br /> characterization of the site and evaluate potential remedial strategies for <br /> compounds, specifically benzene, in ground water at the site <br /> ERM submitted the Investigation Workplan (Workplan) to the County and <br /> CVRWQCB on 22 January 1999 to perform additional investigation <br /> activities at the site In the Workplan, ERM identified areas of the site that <br /> required further investigation to better define the lateral and vertical <br />' extent of TPH-g and BTEX impacts to soil and ground water The <br /> Workplan also proposed grain size and total organic carbon (TOC) <br />' sampling to aid in evaluating potential remedial technologies for the site <br /> Finally, the Workplan included aquifer characterization tests (slug testing) <br /> in monitoring wells MW-1, MW-2, MW-4, and MW-6 to assist in the <br />' analysis of remedial technologies <br /> The County and CVRWQCB verbally approved the Workplan on <br /> 5 February 1999 and the investigation activities were performed on <br /> 11 February 1999 Investigation results are presented below <br /> 21 SOIL AND GROUND WATER SAMPLING <br /> 21.1 LIST-1 <br />' In accordance with the Workplan, ERM installed three soil borings <br /> (HB-17, HB-18, and HB-19) surrounding the former location of UST-1 <br /> (Figure 2) These sampling locations were selected to better define the <br />' lateral and vertical extent of TPH-g and BTEX impacts surrounding <br /> UST-1 The results of the soil and ground water samples are presented in <br />' Tables 1 and 3, respectively Copies of the laboratory analytical results are <br /> presented in Appendix A <br />' 2 1 1 1 Soil <br /> As shown in Table 1, the soil samples collected east and west of the former <br />' UST location(HB-18 and HB-19) contained TPH-g, ethylbenzene, and <br /> xylenes at depths of 10 to 20 feet below ground surface (bgs) These <br />' concentrations decrease with depth In addition, no detectable <br /> concentrations of TPH-g or BTEX compounds were present in samples <br />' 3 <br />