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•-a•....,mss.__ .�— .— b, yards of soil was excavated and properly disposed of at 41 either the Class II facility of Liquid Waste Management, Inc . or at the Class III Durham Road Landfill. On July 23, 1990, approximately 7,300 cubic yards of imported clean fill was used for backfilling of the open excavation. On September 26, 1990, Alton Geoscience personnel supervised the drilling of four soil borings, all of which were [ subsequently converted to ground water monitoring wells (AW-1 f through AW-4 ) . The monitoring well locations are shown in Figure 2 . The findings and conclusions from this and past site investigative work, and from the results of laboratory analyses and field observations of thereliminar round p Y g water investigation are presented in the December 1990 report submitted to the appropriate regulatory agencies . On April 30, 1991 and May 1, 1991, Alton Geoscience conducted a supplemental site investigation by drilling additional soil borings (B-1 through B-9) . Soil Borings B-2 , B-3, B-4 , and B-9 were subsequently converted to ground water Monitoring Wells AW-5, AW-7, AW-6, and AW-8, respectively. The monitoring well locations are shown in Figure 2 . I On May 6, 1991, Alton Geoscience developed wells AW-5 through AW-8. On May 7, 1991, Alton Geoscience performed monitoring and sampling of ground water Monitoring Wells AW-1 through AW-8. Ground water samples were analyzed for total petroleum hydrocarbons as gasoline, total petroleum hydrocarbons as diesel, and benzene, ethylbenzene, and total xylenes, except AW-1 and AW-3 were also analyzed for fecal coliform. Petroleum hydrocarbon constituents were not detected above method detection limits in samples except AW-3, which had detectable concentrations of TPH-G (210 ppb) , ethylbenzene (0 .3 ppb) , and total xylenes (0 .8 ppb) .