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' The monitor wells were lastau ed in Jul <br /> g g y 1994 and the depth to water ranged between 16 and 17 <br /> feet bgs The shallow groundwater beneath the site flows in a northeasterly direction with an <br /> estimated gradient of 0023 (Figure 3) <br /> 22 Chemical Distribution in Soil <br /> INine soil samples were collected and analyzed during the tank and product line removal activities <br /> Hydrocarbon impacted soil appears to be limited to the areas beneath the former 12,000 gallon UST <br /> at 460 parts per million (ppm) TPHg and the north pump island excavation at 13,000 ppm TPHg <br /> (Figure 4) Soil samples analyzed for total lead were below the laboratory detection limit EDB was <br /> detected in soil samples from the excavation at the east end of the 6,000 gallon UST and the north <br /> dispenser island excavation at levels of 0 0065 ppm, and 0 064 ppm respectively The results of the <br /> Itank removal soil sampling are summarized in Table t <br /> Toluene and EDB were not detected in any of the samples collected from the soil borings during the <br /> August 1992 and December 1993 investigations TPHg and xylenes were detected in soil samples <br /> collected from bonngs W2, W3, and W4 at relatively low concentrations (Figure 4) The sample <br /> collected from a depth of 10 5 feet in W4 was found to contain the highest concentration of <br /> hydrocarbon constituents, TPHg, ethylbenzene, and xylenes were reported at 290, 3 4 and 30 ppm, <br /> Irespectively Ethylbenzene was not detected in soil samples collected from W1 or W2, or from W5 <br /> through W7 Benzene was detected at a concentration of 0 0060 ppm in the sample from W3 <br /> collected at a depth interval of 14 0 to 14 5 feet The results of the soil boring analytical results are <br /> summarized in Table 2 <br /> I <br /> Soil investigation results indicate that the petroleum hydrocarbons in soil exist primarily in the pump <br /> island area and within the west end of the former UST tank pit The approximate lateral and vertical <br /> extent of petroleum hydrocarbons in soil is depicted in Figures 5 and 6, respectively <br /> I <br /> I Toc W4 FPLP 'j <br /> ux <br /> n'oW5�02L1 11 <br /> 3 )9: <br /> Aupi 26 1G 1)9: <br /> �4 <br />