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r <br /> Working To Restore Nature <br />' 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 ' November 4, 1992 <br />! FAX: (209) 838-3509 1 <br /> IMD <br /> j <br /> Mr. Harlin Knoll NOV 6 092 ! <br /> San Joaquin County, Public Health Services ENVIRONMENTAL HEALTH � <br /> Environmental Health Division <br /> PERMIT/SERVICES <br /> P.O. Box 2009 <br /> I Stockton, CA 95201 <br /> t i <br /> RE: Workplan-for Soil Excavation,. PG&E's Stockton Service Center, 4040 West <br /> Lane, Stockton, CA <br /> I <br /> . Dear Mr. Knoll: <br /> This, letter. will serve as a Workplan for soil excavation to be conducted at the-above-referenced site <br /> (Figure 1). The scope of the work isbased on findings from previous investigations. <br /> .SITE BACKGROUND <br /> ' The site was -.the location of one 10,000 gallon underground product storage tank which contained <br /> transformer oil for use at the facility (Figure 2). The tank .and ancillary buried product lines were <br /> removed in January, 1987. On January.16, 1987, Twining Laboratories=Inc. collected four soil-samples, <br /> from varying depths, in the vicinity of the,,former 'storage tank and product.lines. The samples were <br /> laboratory analyzed for oil and grease, total volatile organic hydrocarbons, and PCBs. All samples <br /> f contained oil and grease above method detection limits: Only samples S-2 and S-4 contained total volatile <br /> organic hydrocarbons above method.detection limits, and only sample S72 contained 1,0 ppm PCB, <br /> Twining Laboratories' report dated January 26, 1987 is'p`rovided in Attachment 1". Results of laboratory <br /> analyses are:summarized,in Table 1. <br /> SCOPE OF WORK <br /> The following scope of work is based upon the information outlined above. The work is designed to <br /> fremove impacted soil in the vicinity of the former tank and product lines(Figure 2). All field work will <br /> be performed under supervision of RESNA'�personnel ih accordance with the Site Safety Plan(Attachment <br /> I 2); <br /> f . <br /> Soil Excavation and Sampling <br /> t. To'prevent residual contaminants in the soil from acting as a.source of groundwater degradation, the soil <br /> in the vicinity of the former storage.tank and buried product lines will-be excavated. A backhoe capable <br /> of excavating to a depth of at least 15 feet will be used.-A 40-hour health and safety trained PG&E crew <br /> will perform the excavation. It is estimated' that approximately 125 cubic yards of material will be <br /> I WP1092.FNL <br /> J <br /> I <br /> t <br />