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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 /> 1 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/1 was detected in the water <br /> sample obtained from MW1. <br /> The depth to ground water is approximately 60 feet below the <br />' subject 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 in monitoring wells MW1, <br /> MW2 , and MW3 using a KECK KIR-89 Interface probe on 30 September <br />' 1992 . The KECK KIR-89 Interface probe was utilized to determine <br /> if free product existed on the water table. Particular attention <br /> was paid to MW--3 where elevated TPH had been noted during the last <br /> monitoring event. <br /> On 30 September 1992 water samples were obtained from MW1, MW2 , and <br /> MW3 . The water samples were obtained by bailer after three to four <br /> well bore volumes of water had been removed from the well and the <br /> water level recharged to 80% of the original water level . The water <br /> samples were placed in teflon capped VOA vials preserved with HCL. <br /> The samples were then placed in individual zip lock bags and placed <br /> in a chilled container for transport to the laboratory. <br /> The three water samples were analyzed for total petroleum <br /> hydrocarbons (TPH) and purgeable aromatic hydrocarbons (BTE&X) in <br /> accordance with the DHS Method (8015-m) and EPA Method 8020. <br /> U-HAUL \ 2701 WILSON WAY <br /> MJB-92-II \ UH-WILSON RPT (SD5020 2) <br /> 10 OCTOBER 1992 <br /> 2 <br />