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1 Bank of Stockton- Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> ' Project No. 102.2 <br /> May 8,2006 <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 /> 1 <br /> The contour map of the groundwater surface (Figure 3) suggests that the flow of <br /> ' groundwater is to the northeast, and appears generally consistent with <br /> historical norms. The groundwater surface in the vicinity of the vapor extraction <br /> system has become very erratic. . The groundwater elevation has risen several <br /> ' feet since the prior monitoring event. <br /> For several months, the vapor extraction activity has focused on MW-7. This is <br /> reflected in the dramatic decrease in gasoline concentrations from 11,000 ppm in <br /> December to 100 ppm in this sampling event. <br /> ' 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring will continue. Continuous operation of the <br /> new SVEIAS remedial system will continue. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> • <br /> ' 2937 Veneman Ave.,#E240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> t <br />