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PRELIMINARY INVESTIGATION AND EVALUATION REPORT (PIER) <br /> USDA - Soil Conservation Service <br /> 21001 North Elliott Road <br /> Lockeford, California <br /> 1. 0 INTRODUCTION <br /> In accordance with a request from the USDA - Soil Conservation <br /> - Service (SCS) , Geological Audit services, Inc. (GeoAudit) has <br /> prepared this Preliminary Investigation and Evaluation Report for <br /> the property located at 21001 North Elliott Road, Lockeford, <br /> _ California (the site) . <br /> The assessment performed on August 16, 1993, consisted of the <br /> drilling of four borings near the former underground storage tank <br /> excavation and two borings near the pumping island. This report <br /> presents the results of this assessment. <br /> 2 . 0 BACKGROUND r <br /> The site is located in a rural agricultural area of northern San <br /> Joaquin County (Figure 1) . A plan of the site is illustrated in <br /> Figure 2 . In 1991, two underground storage tanks (UST's) and their <br /> dispensers were removed from the site: (1) 500-gallon diesel tank <br /> and (1) 1, 000-gallon gasoline tank. The product and vapor lines <br /> were not removed at that ti=ne. <br /> Soil samples were collected from beneath the UST's and analyzed for <br /> total petroleum hydrocarbons (TPH) , volatile aromatics (BTE&X) , <br /> ethylene dibromide (EDB) and total lead. The samples were probably <br /> collected at a depth of 12 to 15 feet, although the exact depth is <br /> unknown. TPH as gasoline was detected at concentrations up to 1,700 <br /> mg/kg (parts per million, ppm) . BTE&X were detected at <br /> concentrations up to 150, 000 ug/kg (parts per billion, ppb) . EDB <br /> was detected at concentrations up to 55 ppb. No lead or TPH as <br /> diesel were detected in these samples. <br /> _ According to information provided by the SCS, the depth to <br /> groundwater is approximately 80 to 90 feet in the area. According <br /> to the San Joaquin County Flood Control and Conservation District, <br /> depth to groundwater in the area is in excess of 100 feet (Fall <br /> _ 1990) . <br /> To assess the lateral and vertical extent of contamination at the <br /> site, the San Joaquin County Public Health Services - Environmental <br /> Health Division (PHS/EHD) required a soil and, if necessary, a <br /> groundwater investigation of the property. <br /> 1 <br />