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Mr Harlin Knoll <br /> Page 2 of 2 <br /> The samples were transported to Argon Laboratories (ELAP 42359) 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 /> ANALYTICAL RESULTS <br /> Well MW 1 contained TPHg at a concentration of 690 parts per billion (ppb), benzene at 5 4 ppb, <br /> ethylbenzene at 29 ppb, and xylenes at 16 ppb Well MW5 contained TPHg at a concentration of 36,000 <br /> ppb, benzene at 2,400 ppb, toluene at 820 ppb, ethylbenzene at 770 ppb, and xylenes at 4,300 ppb No <br /> gasoline constituents were detected in wells MW3, MW4, or MW9 Analytical results are summarized in <br /> Table 3 Laboratory data sheets and chain of custody documentation are included in Attachment B <br /> Figure 3 presents a benzene isoconcentration map utilizing the most recent analytical results Attachment <br /> C contains graphical representations of TPHg and benzene concentrations over time in site wells <br /> SUMMARY <br /> Groundwater beneath the site during the reporting period ranged from approximately 35 55 to 37 20 feet <br /> btoc and generally flowed east-northeast The potentiometric surface at the site rose an average of 3 22 <br /> feet between November 12, 2003 and February 19, 2004 The water level currently lies above the <br /> screened interval in wells MW4 and MW5 Gasoline constituents were detected at elevated levels in <br /> well MW5 and at relatively low levels in well MW 1 No gasoline constituents were detected in wells <br /> MW3, MW4, or MW9 <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 p,ED FOC <br /> O� <br /> JOHN P u' <br /> LANE � <br /> John P Lane No 6/95 Y <br /> CA Registered Geologist 6795 U <br /> Attachments .� f , <br /> cc Mr Carl Knowles <br /> Mr Patrick D Riddle, Attorney at Law <br /> Mr James L L Barton, CRWQCB <br /> • <br /> G IGROUNDMKNOWLES HAMIREPORTSIQ1\4R1200411QM2004 doc <br />