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I <br /> [AC <br /> F <br /> 6C. - VATC <br /> 5, ASSOCIATES I NC . f <br /> F <br /> C <br /> concentrations of petroleum hydrocarbons and was discharged to the ground surface. <br /> Groundwater well purge and sample logs are provided in Appendix A. <br /> The groundwater samples collected from each well were submitted with Chain of Custody Record <br /> to Sequoia Analytical in Redwood City, California, ELAP Certification No. 1210. The samples <br /> were analyzed for TPHg and BTEX/MTBE by EPA methods 8015 and 8020, respectively. <br /> Groundwater analytical results are summarized in Table 2. The Chain of Custody Record, <br /> laboratory analytical reports, and chromatograms are included in Appendix B. <br /> RESULTS OF LABORATORY ANALYSES <br /> Results of the laboratory analysis of groundwater samples from monitoring wells MW-1, MW-2 <br /> and MW-3 indicate the presence of petroleum hydrocarbons in groundwater in monitoring wells <br /> MW-2 and MW-3. TPHg and BTEX concentrations in well MW-2 increased since last quarter <br /> and appear to be somewhat influenced by fluctuating water levels. No petroleum hydrocarbons <br /> were detected in monitoring well MW-1. The analytical results are summarized in Table 2. <br /> CONCLUSIONS <br /> Based on the results of this quarterly monitoring and sampling, ATC recommends one more event <br /> of groundwater monitoring and sampling of wells MW-1, MW-2, and MW-3 in order to detect <br /> changes in groundwater quality beneath the site. <br /> w;1178611reporlsl2gmr1998.doe 3 <br />