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' Former Manna Pro Site Page 5 <br /> Quarterly Groundwater Monitoring Report <br />' Project Into 207 2 <br /> February 15, 2006 <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 /> depth to the water table has changed little since the last monitoring event in <br />' September <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 The TPH <br /> concentrations in MW-3 displayed a dramatic decrease from 14,000 to 110 ppb <br /> while concentrations in MW-5 remained at little more than trace levels On <br /> the negative side, there has been little overall decrease in contaminant <br /> concentrations in MW-1 in recent sampling events Overall, it is clear that the <br /> lateral extent of the contaminant mass is being substantially reduced <br />' The VE/AS remedial continues in operation and is removing low, but <br /> significant volumes of gasoline <br />' 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring will continue The vapor extraction / air <br />' sparge remedial system will continue in operation, however we anticipate <br /> experimenting with periodic system shut-downs to maximize the effectiveness <br /> of the system <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />