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61.4:50.13Mort Issued: SEP 2' 1986 <br />0 <br />Report 402.331-86.70 <br />PACIFIC GAS AND ELECTRIC COMPANY <br />DEPARTMENT OF ENGINEERING RESEARCH <br />3400 Crow Canyon Road <br />San Ramon, California 94583 <br />LABORATORY TEST REPORT <br />SUBJECT: LODI SERVICE CENTER SUBSURFACE TANK INVESTIGATION <br />Introduction <br />On July 28, 1986 PG&E's Department of Engineering Research (Civil <br />Section), at the request of the San Joaquin Regional Office (Stockton <br />Division), conducted a limited "in house" soil contamination study at PG&E's <br />Lodi Service Center. The Center is located approximately 6 miles east of <br />Lodi along Victor Road (fig. 1). Located within the Service Center is a <br />underground unleaded gasoline storage tank (steel construction - 3000 gallon <br />capacity). The age of the tank is unknown. The tank has been partially <br />excavated to visually inspect the piping for evidence of leaks. Prior to <br />excavation the tank had failed a precision pressure test. The purpose of <br />the investigation was to confirm and identify the possible presence of <br />hydrocarbon contamination in the soil (backfill) encompassing the tank. <br />Site Geology <br />The Lodi Service Center is geographically located on a broad alluvial plain <br />situated in the central part of the Sacramento Valley. The sediments were <br />deposited from streams emerging from highlands surrounding the Great Valley. <br />These alluvial deposits are Recent to Pleistocene in age and are composed of <br />heterogeneous sediments ranging in size from clay to gravel (CDMG 1966). <br />Field Work <br />Field work for this study consisted of drilling and soil sampling in <br />the vicinity of the underground gasoline tank. Prior to drilling, <br />underground utilities were located and marked by service center personnel. <br />The bottom of the gasoline tank was measured to be 8.5 feet deep. The <br />drilling and soil sampling operations were conducted by the DER Civil Unit <br />with the assistance of the Exceltech Drilling Co. Mobile B-34 drill rig and <br />Distribution: DAday <br />RAnderson <br />MLafferty <br />RAMcCurdy <br />LMcMillan <br />HRoss <br />Williams <br />DATE <br />TESTED By <br />APPROVED 7 <br />FILE NO. <br />1356A/mrp4 (6739/BB) <br />