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I <br /> Bank of Stockton - Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> Project No. 102.2 <br /> October 20, 2005 <br /> i <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 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 except for the groundwater mound around MW-7. This is a <br /> ' result of the vapor extraction system, which has been applying a vacuum to <br /> MW-7 for the past two months. Excluding the mound, over the past quarter the <br /> groundwater elevation has fallen about 4 feet since the prior monitoring event. <br /> ' The hydrocarbon and VOC distribution in the MW-7 sample is noteworthy. The <br /> TPH-G concentration of 240,000 ppb is higher than at any time since the end of <br /> ' 2003, which also was abnormally high. At the same time, the BTEX <br /> concentrations are lower than at any time since the well was first sampled in <br /> . 1998. We speculate that the TPH concentration is higher because the vapor <br /> ' extraction is accumulated dissolved hydrocarbons to this vicinity, while the <br /> volatiles are being preferentially removed. <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 /> ' 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0293 <br /> 1 <br />