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.ti <br /> Mr Harlin Knoll <br /> Page 2 of 2 <br /> The samples were transported to Argon Laboratories (FLAP #2359) under chain of custody protocol and <br /> analyzed for TPHg and BTEX utilizing EPA methods 8015B and 8021B, respectively Purged <br /> groundwater was contained in labeled 55-gallon drums pending disposal Copies of field purge logs and <br /> water level measurements are included in Attachment A <br /> Groundwater Analytical Results <br /> Well MWS contained TPHg at a concentration of 34,000 parts per billion (ppb), benzene at 3,000 ppb, <br /> toluene at 820 ppb, ethylbenzene at 440 ppb, and xylenes at 3,000 ppb Well MW 1 contained TPHg at a <br /> concentration of 900 ppb, benzene at 10 ppb, toluene at 0 5 ppb, ethylbenzene at 33 ppb, and xylenes at <br /> 12 ppb No gasoline constituents were detected in wells MW2, MW3, or MW4 Analytical results are <br /> summarized in Table 3 Laboratory data sheets and chain of custody documentation are included in <br /> Attachment B Figure 3 presents a benzene isoconcentration map utilizing the most recent analytical <br /> results Attachment C contains graphical representations of TPHg and benzene concentrations over time <br /> in site wells <br /> SUMMARY <br /> Groundwater beneath the site was encountered at approximately 37 8 to 39 3 feet btoc on August 12, <br /> 2003 and generally flows east-northeast The potentiometric surface at the site fell an average of 4 82 <br /> feet between May 27 and August 12, 2003 The water level currently lies above the screened interval in <br /> wells MW4 and MW5 <br /> • Gasoline constituents were detected at elevated levels in well MW5 and at relatively low levels in well <br /> MW 1 No gasoline constituents were detected in wells MW2, MW3, or MW4 <br /> The next quarterly sampling event is scheduled for November 2003 Please contact John Lane at (209) <br /> 838-9888 if you have any questions or comments regarding this report <br /> Respectfully, EKED GEG <br /> Ground Zero Analysis, Inc 4% <br /> .JOHN P <br /> o rte^ray o <br /> John P Lane Ln No GY95 <br /> CA Registered Geologist 6795 <br /> Attachments Oz <br /> cc Mr Carl Knowles <br /> Mr Patrick D Riddle, Attorney at Law <br /> Mr James L L Barton, CRWQCB <br /> G IGROUNDZEIKNOWL.ES HAM1REPORTSIQMR13QM2003 doc <br /> i <br />