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Third Quarter 2004 Groundwater Report <br /> 8200 N Highway 99, Stockton, CA <br /> Page 6 of 6 <br /> MTBE was not detected in the C Zone well MW13C, which is located east of the former water <br /> supply well and no MTBE was detected in B Zone well MW 14B, which is located within a few <br /> feet of the former water supply 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 wells MW15 and MW16 The concentration of <br /> MTBE in well MW 12 appears to be significantly reduced from previous sampling rounds <br /> Groundwater extraction appears to be reducing the concentration of gasoline constituents in well <br /> MW1 and nearby monitoring wells MW3 and MW4, which are located approximately 51 feet <br /> and 56 feet, respectively, from the extraction well <br /> Ground Zero has submitted a workplan to implement soil vapor extraction at the site to reduce <br /> petroleum hydrocarbon contamination in the vadose zone as requested by EHD However, based <br /> upon the absence of dissolved MTBE in deeper zone wells MW9B and MW14B, the reducing <br /> trend of dissolved MTBE concentrations in deeper zone well MW13C, the recent non-detect <br /> results for MTBE in well MW13C, and the absence of MTBE in the site water supply well, <br /> additional investigation of deeper aquifers does not appear to be warranted at this time <br /> Please contact Ground Zero at (209) 838-9888 if you have any questions or require additional <br /> information <br /> 1 " <br /> Respectfully, D Geo-� <br /> Ground Zero Analysis, Inc G G? <br /> j HNr P , <br /> Ltn''i�1 f <br /> No G/95 0 <br /> John P Lane <br /> CA Registered Geologist No 6795 pF C pN <br /> Attachments <br /> cc Mr Ray Baghetto/Mr Frank Rauzi <br /> Mr James L L Barton, CRWQCB <br /> 1 <br />' G IGROUNDZEITULEBURGIRepo,lslQMR1200411QM2004 dor <br />