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Bank of Stockton Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> • April 23,2003 <br /> 1 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 map of the groundwater surface (Figure 3) suggests that the now of <br />' groundwater is to the northeast The water table has risen over less than a foot <br /> since the last monitoring event in December of 2002 The direction and gradient <br />' of flow have remained generally consistent over the entire time the wells have <br /> been monitored <br />' In general, the analytic data suggest that contaminant levels are gradually <br /> decreasing except in the area of MW-$B 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 is in the process of constructing a pilot level vapor extraction and <br />' air sparge system to test the feasibility of using these techniques as an effective <br /> remedial measure A new sparge well and a new vapor extraction well were <br /> recently constructed but the surface installations have not yet been completed <br /> r <br /> i <br /> i <br /> i <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 /> 1 <br />