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Former Manna Pro Site Page 5 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 207 2 <br /> October 21, 2004 <br />' 3.0 DISCUSSION <br />' 3.1 Discussion of Data <br /> Field and analytical data results are summarized in Summary Table 1 and <br /> tillustrated in Figures 3 through 5 <br />' The map of groundwater gradient (Figure 3) suggests that the flow direction <br /> and gradient of groundwater is consistent with historical measurements <br />' The water table has fallen about 3 feet since the last monitoring event in <br /> June The depth to water is about 37 feet which is the lowest level since 1995 <br /> This low stand of groundwater should increase the efficiency of the vapor <br />' extraction remedial system <br /> The laboratory analytical data from this and previous sampling events are <br />' somewhat erratic, but the remedial system is clearly having a positive effect In <br /> reducing the concentration of gasoline in the groundwater Based on the <br /> saturation of carbon filters in conjunction with weekly measurement of <br /> extracted vapor, we estimate that approximately 7,000 pounds of gasoline <br /> have been removed from the subsurface <br />' 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring will. continue The vapor extraction / air <br /> sparge remedial system will continue in operation for the foreseeable future <br /> f <br /> 2937 Veneman Ave ,#13240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95366 Fax(209) 569-0293 <br /> I <br />