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' Former Manna Pro Site Page 5 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 207 2 <br /> July 13, 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 /> iillustrated 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 one half a foot since the last monitoring event in <br />' March <br /> The mitigation measures employed at the site have substantially reduced the <br />' concentrations of groundwater contaminants, however the residual <br /> concentrations remain significantly above clean-up goals <br />' The VE/AS remedial system has reached the point where the extracted vapor <br /> has very low concentrations of entrained gasoline The air sparge system is <br /> believed to remain effective in reducing contaminant concentrations, but there <br />' is no direct way to measure the effect The system has temporarily been shut- <br /> down to allow the subsurface equilibrium to restore itself <br /> i3.2 Future Work Schedule <br />' Quarterly groundwater monitoring will continue The vapor extraction / air <br /> sparge remedial system will be restarted in several weeks and the results will <br /> be used to help determine the best future course of action <br /> I <br /> I <br /> I <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0293 <br /> I <br />