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. modified for gasoline, and for oxygenates by EPA method 8260 TPH-g, benzene, and MTBE concentrations appear in Table 1 and Appendix B The TPH-g, benzene, and MTBE isoconcentration maps are presented in Figures 3, 4, and 5. The highest concentrations of TPH-g, benzene, and MTBE were found in well MW-11 (140,000 ug/L, 28,000 ug/L, and 1,100 ug/L, respectively) Since the third quarter of 1997, Thrifty has analyzed for the requested oxygenates di-isopropyl ether, ethanol, ethyl-tert butyl ethyl, methanol, tert-amyl methyl ether, tert-butanol, and methyl tert- butyl ether(MTBE) by method 8260 Results above detection limits were detected in monitoring wells MW-11 for Methanol at 5 8 mg/L and tert-butanol at 0 98 mg/L These analytical laboratory results are presented in Appendix A Summary and Recommendations On August 20, 1999, Thrifty forwarded to your attention the "Additional Site Assessment and Remediation Svstem Design Retort" (including the site pump test) On September 10, 1999, a telephone conversation between Mr Larry Higinbotham and Mr Raymond C Friedrichsen of Thrifty and yourself was conducted to address concerns that you believed were omitted from the report As a result, Thrifty was granted a 60-day extension to submit a report addressing the additional items discussed i Thrifty has retained Kjeldsenk, Sinnock&Neudeck,Inc to survey the site Thrifty plans to continue quarterly groundwater monitoring and sampling of all monitoring and vapor wells that contain enough groundwater to purge and sample All interpretations expressed in this report are based upon review of data collected by EMC Should you have any questions or require additional information, please contact either of the undersigned at (562) 921-3581 X376 Written by Reviewed by 4� Q� 0 CY 6R;rnond C Friedrichsen u sell ow rs,�RG A&MM Project Manager Ge to ist Environmental Geologist i