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' Bank of Stockton-Cutter Lumber Site Page 5 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> January 24, 2001 <br /> 3.0 DISCUSSION <br />' 31 Discussion of Data <br /> Field and analytical data results are summarized in Tables 1 and 2 and illustrated in Figures 3 <br /> through 5 <br />' The map of groundwater gradient (Figure 3) suggests that the flow of groundwater is to the <br /> northeast The water table has fallen over 3 feet since the seasonal high measured on April <br /> 25, 2000 The direction and gradient of flow have remained generally consistent over the <br />' entire time the wells have been monitored <br /> In general, the analytic data suggest that contaminant levels are gradually decreasing except <br />' in the area of MW-8B, near the core of the plume It appears that the lateral extent of the <br /> contaminant plume may also be gradually decreasing The wells MW-10 and MW-11, at the <br /> distal periphery of the plume have been producing samples with essentially non-detectible <br />' levels to petroleum contaminants <br /> 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring and sampling should continue By informal agreement <br /> with the PHS-EHD, additional work pertaining to engineered remedial action has been held <br />' in abeyance pending the results of a feasibility study at the former Manna Pro facility, which <br /> is adjacent to the south The two sites share many characteristics and it is suspected that the <br /> eventual remedial action will also be similar at the two sites Geo-Phase recently completed <br />' the Feasibility Study for the Manna Pro site The Feasibility Study evaluated several possible <br /> remedial alternatives, and simultaneous vapor extraction and air sparging was identified as <br /> the alternative most likely to provide a cost-effective method of mitigating the release A <br /> Corrective Action Plan will be submitted in the near future to propose methods and protocols <br /> for the construction and operation of the selected remedial alternative at the Manna Pro <br />' release site The FHS-EHD staff have elected to monitor progress at the Manna Pro site for <br /> the time being, before directing that a Corrective Action Plan be developed for this site <br /> 1 <br /> I2937 Veneman Ave,NB240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0293 <br />