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Applied Geotechnology Inc. <br /> o Chemical analysis of groundwater found one sample, PW-3, with an <br /> elevated level of dissolved arsenic which does not exceed the <br /> federal maximum contaminant level of 0.05 mg/1. The source of <br /> this elevated arsenic level is unknown, but the close proximity of <br /> PW-3 to the LIKA facility suggests LIKA as a potential source. <br /> o Fuel hydrocarbon chemical analysis detected 3,500 mg/kg of diesel <br /> in soil sample S-1. This sample is located at the head of the <br /> ditch which receives runoff directly from the paved area. The <br /> high diesel concentration is probably caused by miscellaneous <br /> spills and drips from equipment in the paved area, which eventu- <br /> ally washes into the ditch near S-1. A bulldozer is currently <br /> parked next to the S-11s sample location. A spill while refueling <br /> this bulldozer or other equipment could easily explain the high <br /> diesel concentrations in the drainage ditch. <br /> In summary, available data indicate no known releases to the environment <br /> during USG Interiors' operations. Limited data are available on site use <br /> prior to Donn Corporation activities. The identified TPH and metal <br /> contamination in the drainage ditches is likely the result of surface water <br /> runoff from paved areas including parking lots and roads. The sources of <br /> elevated metals and low levels of organic compounds in groundwater is <br /> unknown; these metals observed may be indigenous to the area. <br /> -35- <br />