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c <br /> T Corporation <br /> 1433 North Alarket Boulevard <br /> Sacramento, CA 95834-1943 <br /> Tel. 916.928.3300 <br /> Fax...916.928.3341 <br /> wth <br /> I AM 4p ff AW® J lyA`'NYeae�71 The IT Croup <br /> p Project 809251 <br /> Ms. Wendy Arano <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827 <br /> Re: Evaluation of Volatile Organic Compound Impacts to Shallow Groundwater at the <br /> Corral Hollow Sanitary Landfill, San Joaquin County, California <br /> Dear Ms. Arano: <br /> On behalf of the San Joaquin County Department of Public Works, Solid Waste Division <br /> (SWD), IT Corporation (IT/EMCON) is submitting this report evaluating the volatile <br /> organic compound (VOC) impacts to shallow perched groundwater at the subject site. <br /> This evaluation was conducted in response to VOC detections in shallow groundwater <br /> samples and an apparent tetrachloroethene(PCE) concentration trend in well MW-5. The <br /> SWD and IT/EMCON believe that landfill gas is the source of the VOCs. This <br /> evaluation was conducted consistent with the SWD Revised Workplan and comments <br /> presented in your letter dated May 8, 2000. The scope of work included the following <br /> tasks: <br /> • Drilling of three exploratory borings to evaluate the extent of shallow VOC <br /> impacted groundwater <br /> • Collection and analysis of a groundwater sample from shallow zone monitoring <br /> well MW-5 concurrent with drilling activities <br /> • Collection and analysis of landfill gas samples from gas probes GW-1, GW-2, and <br /> GW-3 concurrent with drilling activities <br /> • Collection of shallow monitoring well water levels within 72 hours of completing <br /> drilling activities <br /> Detailed descriptions of the activities conducted for each task and the results of each task <br /> are presented in the following sections. <br /> EXPLORATORY BORINGS <br /> Three exploratory borings B-1, B-2, and B-3 were drilled at the locations shown on <br /> Figure 1 to evaluate the extent of VOC impacted shallow perched groundwater. <br /> R n <br /> SAC:\N:\Consulting\data\Shared\Projects\PJ8\809251.aa.doc-00\ta:l <br /> 809251 <br />