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Former Manna Pro Site <br /> Page 6 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> August 13, 2002 <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 almost 6 inches since the last monitoring event in <br /> March A slight local groundwater high in the vicinity OB-4 is evident as has <br /> often been the case in the past <br /> The analytic data suggest Y gg that contaminant levels are near the law end of <br /> historical norms This is apparently due to seasonal fluctuation of the <br /> groundwater table <br /> 3.2 Future Work Schedule <br /> The first phase vapor extraction / air sparge remedial system has been <br /> completed and operated for 90 days A report of this work and the results was <br /> issued on June 18, 2002 Based on the results of this work, an addendum to <br /> the Corrective Action Plan was prepared on August 12, 2002 <br />' Upon LOP approval of the CAP addendum, a detailed budget of the work <br /> associated with the revised CAP will be submitted to the California UST <br /> Clean-up fund for pre-approval of the anticipated costs <br /> Quarterly monitoring will continue with a modified sampling schedule Based <br />' on previous discussion with the LOP case officer, the following sample <br /> schedule will be adopted for future quarterly monitoring events <br /> Well(sSam lin Frequency <br /> MW-1, MW-3, MW-6 -Quarterly <br /> MW-2, MW-5, MW-9 Semi-Annually <br /> MW-4, MW-7, MW-8, MW-10 Annually <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />