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1 Bank of Stockton-Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 1011 <br /> • April H,2001 <br />' 3.0 DISCUSSION <br /> 3.1 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 risen about 1 5 feet since the last monitoring event in <br /> December of, 2000 The direction and gradient of flow have remained generally consistent <br />' over the 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 and MW7, near the core of the plume It appears that the lateral extent <br /> of the contaminant plume may also be gradually decreasing The wells MW-10 and MW-11, <br /> at the distal periphery of the plume have been producing samples with essentially non- <br /> detectible levels to petroleum contaminants <br /> 3.2 Future Work Schedule <br /> lie <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 Corrective Action Plan for the Manna Pro site, and this plan has been approved <br /> Conceptually, the approved CAP entails vapor extraction technology with simultaneous air <br /> sparging It is anticipated that this same methodology will prove effective in mitigating the <br /> gasoline release at this site In order to verify this methodology and to determine the <br /> appropriate spacing for the service wells, we herein propose that pilot testing be completed <br /> This pilot testing will involve a short period (about 1 week) in which temporary equipment <br /> will be installed to extract petroleum laden vapors from on well and to inject air (sparge) into <br /> a second well This work will also necessitate the construction of two new service wells <br /> 1 'I <br /> 1 <br />' 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0293 <br />