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� i i 1 INTRODUCTION This report presents the results of a soil investigation at two fuel dispensers and the underground waste oil Ji 9 tank (WOT) piping at the Pacific Gas and Electric Company(PG&E) Stockton Service Center at 4040 West Lane, Stockton, San Joaquin County, California (Figure 1). The WOT is located 10 feet south of the southwest corner of the Fleet Services building. Three dispensers are located south of the Fleet Services building (Figure 2): two unleaded gasoline dispensers (UNL1 and UNI-2)on a fuel island 20 feet south of the s=leet Servs { Services building, and one diesel dispenser on a fuel island 50 feet from the building (Figure 3). i` The investigation assessed the extent of diesel in soil near the diesel dispenser, gasoline constituents near the eastern gasoline dispenser(UNI-1), and tetrachloroethene(PCE) near the WOT piping based on the analytical results of October 2003 grab soil sampling by Geo-Logic(Crockett, CA)that was conducted as part of a WOT piping and fuel dispenser upgrade protect. Grab soil samples collected as part of the E upgrade contained detectable levels of these constituents at the respective locations. Tables 1 A and 1 B present summaries of the upgrade soil sample analytical results. Appendix A is the Geo-Logic report. I On November 24 2003, the San Joaquin County Environmental Health Department(EHD) issued.a Notice of Responsibility(NOR)notifying PG&E that the site has been placed in the Local Oversight Program. An � accompanying cover letter dated November 25, 2003 requested-that a workplan be submitted to EHD. On January 30, 2004, PG&E Technical and Ecological Services (TES)submitted a Workplan (PG&E 2003)to I � EHD; on March 22, 2004, PG&E Environmental Affairs submitted a,vvorKpian Addendum to EHD. Ms. I I' . Margaret Lagorio of EHD approved the proposed work. Appendix B contains the NOR, NOR cover letter, Workplan cover letter, and Addendum. The soil investigation was pkerformed by TES in accordance with the Workplan and Workplan Addendum. [R � 2 BACKGROUND t 2.1 Description of Three Fuel Dispensers and Waste Oil Tank The fuel dispensers were installed in the late 1980s. In December 2000, under dispenser containment (UDC) pans were installed beneath the three fuel dispensers. During the installation, approximately three i cubic yards of PHC-affected soil were removed from around the UNI-2 dispenser, and 22 yards were :i removed from around from around the diesel dispenser(IT Corp 2001). Figure 4 shows the outlines of } those excavations. The excavated soil was transported to Forward Landfill (Manteca, CA). 'i t 402.331.04.30 ' r � y