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' Former Manna Pro Site Page 5 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> January 11, 2005 <br />' 3.0 DISCUSSION <br />' 3.1 Discussion of Data <br /> Field and analytical data results are summarized in Summary Table 1 and <br />' illustrated 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 The <br /> water table has risen about 15 feet since the last monitoring event in <br />' September <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 <br /> I <br /> I <br /> I <br /> • <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />