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Second Quarter 2004 Groundwater Report <br /> 8200 N Highway 99, Stockton,CA <br /> Page 6 of 6 <br />' MTBE was detected at relatively low levels in C Zone well MW13C, which is located east of the <br /> former water supply well No MTBE was detected in B Zone well MW 14B, which is located <br />' within a few feet of the former water supply well MTBE was detected in well MW9B at 0 6 <br /> ppb, the first detection of MTBE in that well <br />' 6.0 CONCLUSIONS <br />' Dissolved MTBE in the shallow aquifer beneath the site does not extend to the nearby <br /> residences, as evidenced by non-detect results in newly installed wells MW 15 and MW 16 <br /> The concentration of MTBE in well MW 12 appears to be sigmficantly reduced from previous <br />' sampling rounds <br /> Groundwater extraction appears to be reducing the concentration of gasoline constituents in <br />' well MW 1, although the rate of removal of contaminants is slow Extraction of contaminated <br /> groundwater from the single extraction well does not appear to have a significant impact on the <br /> concentration of MTBE in wells VW1, MW4, or MW3, which are located approximately 25 <br />' feet, 51 feet, and 56 feet, respectively, from the extraction well <br /> Please contact Ground Zero at (209) 838-9888 if you have any questions or require additional <br /> information <br /> Respectfully, ED G�c� <br />' Ground Zero Analysis, lnc <br /> JOHN P <br /> 1o LANE o <br /> No 6795 <br /> John P Lane <br /> CA Registered Geologist No 6795 �>F <br />' 4F C <br /> Attachments <br />' cc Mr Ray Baghetto/Mr Frank Rauzi <br /> Mr James L L Barton, CRWQCB <br /> 1 <br /> 1 <br /> 1 <br /> G 1GROUNDZEITULEBURG1ReportslQMR12004UQM2004 doe <br />