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WMm _ _ y HYDROCEOLOGfC SSESS ENI .OR ^LAN Shall Service Station 820 West Charter Way Stockton,California Delta Project No.40-88-686 Page 4 A single soil sample taken front beneath the steel waste oil tank when it was removed in June of - 1987 was analyzed for TPH.BTEX,and polychlorinated biphenyl(PCB)by EPA Method 8080,and halogenated volatile organic compounds by EPA Method 8010. All of the test results were negative. 2 ill k I-II- ry- No spills or leaks have been reported at this site. Precision tank tests have been performed regularly over the years and no leaks have been detected. Copies of the latest test results(from June 1988)are contained in Appendix A. The latest precision tests continue to indicate that the tanks are tight. 2.4 Wei Inventory A review of well records on file with the California Department of Water Resources indicates that there are two ivells within a 1/2-mile radius of the site. A municipal well, owned by the City of - Stockton, is located near the intersection of Lincoln and Worth Streets, approximately 1,800 feet north of the site. Well records show that a well located near the intersection of Center and Jefferson streets, approximately 2,500 feet northeast of the site, is owned by the California Water Service Company. 2.S Undareround Utilities All underground utilities will be verified with utility companies prior to the installation of proposed monitoring wells at the site. A map illustrating underground utility locations will be prepared and included in the report summarizing the results of the proposed investigation. 3.0 RESU[,TS QF PREVIOIJS WORK ��Is and Ground �Va�r , On February 8, 1989,Delta advanced fo>r"soil borings at the site to evaluate the presence or absence of petroleum constituents in sails surrounding the existing tanks and product lines. Four additional borings were advanced the fallowing day in an attempt to define an area free of petroleum constituents in which the new tanks could be installed. During advancement of soil borings, the soils beieath the site were found to consist of clayey silt and silty clay, with a minor fine- to medium-grained sand fraction, The surface of the site is completely paved with a layer of asphalt approximately 3 inches thick. Soil boring logs are presented in Appendix B. .- Ground water was encountered only in soil boring SB-1 at a depth of approximately 29 feet below ground surface. Water samples were not collected from this soil boring. All borings advanced at the site were sealed from the bottom of the borehole to ground surface with cement/bentonite grout.