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16 The results of the soil sample analysis, form each of the borings, <br /> indicates that soil contamination extends from the surface down to <br /> the ground water table in the area of the fuel dispensing islands <br /> and product line trenches, boring B7 (Figure 2) (AC report dated 14 <br /> June 1993) . <br /> Elevated concentrations of TPH and BTE&X were also detected in the <br />' ground water samples from each of the three additional monitoring <br /> wells (AC report dated June 1993) . A concentration profile of TPH <br />' and Benzene illustrated that at least two separate ground water <br /> contaminant plumes exist beneath the subject site (AC report dated <br /> June 1993) . <br />' The depth to ground water is approximately 78 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. A graph of the ground <br />' water elevations illustrates that the ground water table has <br /> fluctuated over a four foot interval since August of 1991 <br /> (Appendix) . The hydraulic gradient, calculated in May 1993 is <.01 <br /> to the west. The hydraulic gradient has also fluctuated over time <br /> (Figure 2) . <br />' To determine the current status of the ground water contamination, <br /> a ground water sampling event was conducted on 8 October 1993. <br /> PRQCEDU ..ES <br />' The depth to ground water was measured in each of the monitoring <br /> wells using a ground water probe on 8 October 1993 by <br /> representatives of HKM, Environmental (HKM) . <br /> On 8 October 1993 , HKM obtained ground water samples from each of <br /> the monitoring wells on the subject site. Prior to obtaining the <br /> water samples three to four well bore volumes of water had been <br /> removed from the well and the ground water temperature, <br /> conductivity and pH had stabilized (HKM - Field Notes) . The ground <br /> water samples were obtained by disposable bailer and immediately <br /> placed into teflon capped VOA vials preserved with HCL. The samples <br /> were then placed in a chilled container for transport to the <br /> laboratory. The samples were held at HKM Environmental until <br /> Sunday, 10 October 1993 when they were transported to Applied <br />' Consultants Santa Ana office, VIA Greyhound Bus Lines, for next day <br /> delivery to the laboratory. <br /> U-HAUL 1 2701 N WnSON WAY <br /> MTB-93-V/U-HAUL QM5 (SD5783 3) <br />' 19 OCTOBER 1993 3 <br /> 1 <br />