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' Bank of Stockton- Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 102 2 <br /> August 1,2003 <br />' 3.0 DISCUSSION <br />' 3.1 Discussion of Data <br /> Field and analytical data results are summarized in Tables 1 and 2 and <br />' illustrated in Figures 3 through 5 <br />' The data collected during this monitoring event were somewhat abnormal in <br /> that the event was conducted concurrently with the conclusion of field work for a <br /> pilot vapor extraction and sparge test The air sparge well locally raised the <br />' groundwater by as much as 3 feet in MW-6 For this reason, the depth to water <br /> in MW-6 was not included in the contour map of the groundwater surface The <br /> map of the groundwater surface (Figure 3) suggests that the flow of groundwater <br />' is to the northeast The 3-point calculation however is slightly to the west of <br /> north The discrepancy is due to the limited area of the 3-point solution which <br /> covers a significant local crenellation of contours on the groundwater map The <br />' water table has fallen less than a foot since the last monitoring event in March <br /> of 2003 The 3-point calculation notwithstanding, the direction and gradient of <br /> • flow have remained generally consistent over the entire time the wells have been <br />' monitored <br />' In general, the analytic data suggest that contaminant levels are gradually <br /> decreasing except in the area of MW-8B and MW-7, near the core of the plume <br /> It appears that the lateral extent of the contaminant plume may also be <br />' gradually decreasing The wells MW-10 and MW-11, at the distal periphery of <br /> the plume have been producing samples with non-detectible levels to petroleum <br /> contaminants <br />' 3.2 Future Work Schedule <br />' Quarterly groundwater monitoring and sampling should continue Geo-Phase <br /> Environmental recently completed a pilot test of a vapor extraction and air <br /> sparge system, and assessed the feasibility of using several possible techniques <br />' as an effective remedial measure The report was dated August 1 2003 and <br /> entitled Report Remedial Action Pilot Test and Feasibility StudWe <br /> anticipate that the SJC-EHD will direct that the results if the work be <br />' incorporated into a final Corrective Action Plan (CAP) <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 />