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Mr Harlin Knoll <br /> Page 2 of 2 <br /> • groundwater was contained in a labeled 55-gallon drum pending disposal Copies of field purge logs and <br /> water level measurements are included in Attachment A <br /> ANALYTICAL RESULTS <br /> Well MW5 contained TPHg at a concentration of 16,000 ppb, benzene at 1,600 ppb, toluene at 440 ppb, <br /> ethylbenzene at 460 ppb, and xylenes at 2,700 ppb, which represent reductions of 20-63% from the <br /> concentrations detected in May 2004 No groundwater samples were taken from the other site wells <br /> Analytical results are summarized in Table 3 Laboratory data sheets and chain of custody documentation <br /> are included in Attachment B Attachment C contains a graphical representation of TPHg and benzene <br /> concentrations over time in well MW5 <br /> SUMMARY <br /> Groundwater beneath the site during the reporting period ranged from approximately 40 34 to 41 85 feet <br /> btoc and generally flowed east-northeast The potentiometric surface at the site fell an average of 4 24 feet <br /> between May 12, 2004 and September 17, 2004 Contaminant concentrations in well MW5 have exhibited <br /> a declining trend since December 1996 The most recent results represented a reduction of 20-63% from <br /> May 2004 levels and 90-98% from historic high concentratons to that well <br /> Please contact John Lane at(209) 838-9888 if you have any questions or comments regarding this report <br /> Respectfully, <br /> Ground Zero Analysis, Inc <br /> 10 <br /> Joe Vasquez <br /> Staff Geologist jOHW P <br /> No 6I95 <br /> John P Lane p ' <br /> CA Registered Geologist 6795 Qr Cs\�-�� " <br /> Attachments <br /> cc Mr James L L Barton, CRWQCB <br /> Mr Carl Knowles <br /> Mr Patrick D Riddle, Attorney at Law <br /> • <br /> G\GROUNDZEIKNOWL£S HAM\REPORTS\QMM2004\3QM2004 doc <br />