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' Former Manna Pro Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 207 2 <br /> • July 26, 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 />' 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 <br /> The water table has fallen about 1 5 feet since the last monitoring event in <br /> March <br />' The prior laboratory analytical data from the previous two sampling events <br /> indicated groundwater samples contained materially lower concentrations of <br /> petroleum hydrocarbons than has been typical This reduction was attributed <br />' to the effects of the vapor extraction/sparge system The samples from this <br /> current event exhibited contaminant concentrations that appear more typical <br /> of samples from the past several years <br /> 1 <br />' 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring will continue The vapor extraction / air <br />' sparge remedial system is now in operation and will continue in operation for <br /> the foreseeable future <br /> 1 <br /> 1 <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />