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In October 1991, ETS submitted a Preliminary Investigation and ` <br /> Evaluation Report (PIER) which included soil sampling in the bottom <br /> of the open excavations, the drilling of three (3) 100 ' deep <br /> borings, and the conversion of the three borings into 2-inch <br /> diameter monitoring wells (Figure 2) . <br /> In May 1992 , ETS submitted the first quarterly update report which <br />' included obtaining and analyzing water samples from each of the <br /> three monitoring wells . <br />' Elevated concentrations of Total Petroleum Hydrocarbons (TPH) and <br /> purgeable aromatic hydrocarbons (BTE&X) were detected in soil <br /> samples obtained from the gasoline tank excavation, the product <br />' line excavation, and in each of the three borings. The highest TPH <br /> concentration, 3 , 300 mg/kg was detected in the soil sample obtained <br /> from boring B3 at a depth of 65. 5 feet (Table 1) . Free product was <br />' also encountered In the product line excavations. <br /> Elevated concentrations of Total Petroleum Hydrocarbons (TPH) and <br /> purgeable aromatic hydrocarbons (BTE&X) were also detected in water <br /> samples obtained from monitoring wells MW1, MW2 , and MW3 (Table 2) . <br /> The highest TPH concentration, 7, 600 µg/l was detected in the water <br /> sample obtained from 14W1. <br />' The depth to ground water is approximately 82 feet below the <br /> subaect site. According to Mr. Michael Infurna of the San Joaquin <br /> Public Health Services, the ground water elevation in this area <br /> fluctuates as much as 20 feet, seasonally. The hydraulic gradient, <br /> calculated by ETS, is . 001 to the west. <br /> PROCEDURES <br />' The depth to ground water was measured 3n monitoring wells NW1, <br /> MW2, and MW3 using a ground water probe on 28 December 1992 . <br /> On 28 December 1992 , HKM Inc. purged and sampled the monitoring <br />' wells under the supervision of Applied Consultants. Water samples <br /> were obtained from MW1, MW2 , and MW3 The water samples were <br /> obtained by bailer after three to four well bore volumes of water <br />' had been removed from the well and the waterell recharged to 80% <br /> of the original water level . The water samples were placed in <br /> teflon capped VOA vials preserved with- HCL. The samples were then <br /> placed in individual zip lock bags and placed in a chilled <br />' container for transport to the laboratory. <br /> U-HAUL \ 2701 WILSON WAY <br /> MJB-93-1 \ UH-WILSON RPT (5+5020 2' <br /> 11 JANUARY 1993 <br /> 2 <br />