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1 <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 American Environmental Network Labs in Pleasant All, California, DOHS Certification No. <br /> 1172. The samples were analyzed for TPHg and BTEX by EPA methods 8015 and 8020, <br /> respectively, and oxygenate fuel additives by EPA method 8260. Groundwater analytical results <br /> are summarized in Table 2. The Chain of Custody Record, laboratory analytical reports, and <br /> 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 decreased since last quarter <br /> and appear to be somewhat influenced by fluctuating water levels. In MW-3, concentrations of <br /> TPHg, benzene, ethyl benzene, and xylenes decreased but were the same order of magnitude as <br /> previous quarters. MTBE was detected in well MW-2 at concentrations well below the 35.0 ugll <br /> State Advisory Level (OEHHA) for MTBE. No other oxygenate fuel additives were detected. <br /> No petroleum hydrocarbons were detected in monitoring well MW-1. The analytical results are <br /> summarized in Table 2. <br /> F = CONCLUSIONS <br /> Based on the results of this quarterly monitoring and sampling, ATC/Smith Technology <br /> recommends continued groundwater monitoring and sampling of wells MW-1, MW-2 and MW-3 <br /> in order to detect changes in groundwater quality beneath the site. We also recommend no <br /> further monitoring for oxygenate fuel additives by EPA Method 8260. <br /> w:1951221Reporlsl3QMR1997.doe 3 <br /> Sion <br />