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1 - <br /> 1 <br /> 11171cot November 11, 1986 <br /> AGS Job #8696-1 <br /> ' The results of laboratory analyses indicate that soil <br /> contamination exceeds 1, 040 ppm in an area including the base of <br /> ' the tank excavation at its east end, corresponding to sample S1. <br /> S1 was taken at a depth of approximately 14 feet. Sample S2, <br /> which shows low levels of hydrocarbon contamination, was <br /> collected at a depth of approximately 12 feet, to the east of sl <br /> ' and under the edge of the excavation. Low levels of total <br /> hydrocarbons in soil samples collected from borings are <br /> consistant with limited migration of contaminants. <br /> ' Ground water has been affected by contamination probably <br /> result of the fuel leaks , such as over filling, that occurreda <br /> ' while the removed tank was in operation. The levels of benzene <br /> and other hydrocarbon constituents detected in water samples from <br /> MW-1 are in excess of accepted safe drinking water standards. <br /> ' Applied GeoSystems recommends that the tank cavity be further <br /> excavated at its east end, in the area of soil sample S1. This <br /> excavation should proceed to a depth corresponding to the ground <br /> water surface, which was approximately 16 feet in MW-1. <br /> time, we recommend that the excavation be backfilled. Thet that <br /> excavation should proceed as soon as possible, so as to eliminate <br /> ' the potential hazards associated with an open excavation. We <br /> feel that remedial actions required to address ground water <br /> contamination can proceed effectively after the excavation has <br /> been closed. These measures will probably include drilling of <br /> ' <br /> additional wells in order to delineate the contaminant plume and <br /> to collect and treat the contaminated ground water. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 App/led GeoSystems <br />