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r 4• <br /> a <br /> 1� <br /> groundwater investigation. A review of the available analytical data from previous investigations <br /> can be summarized as follows: <br /> 1. Petroleum hydrocarbons and BTEX compounds were never detected in any of the 10 <br /> groundwater samples collected from four on-site monitor wells and two Hydropunch <br /> groundwater samples. <br /> 2. All contaminated soil beneath the Weed Oil and Formulated Oil tanks was removed <br /> during the tank removal process. <br /> 3. Fuel related contamination beneath the gasoline tank was removed to a depth of 31 feet <br /> bgs (completed in October 1986). <br /> 4. Petroleum hydrocarbons and BTEX compounds were not detected in four soil borings <br /> adjacent to the gasoline tank excavation at sample depths of 41.5 feet bgs (1986 soil <br /> borings B-3 and B-4), and at depths of 45 ft., 50 ft., and 55 ft. bgs (1994 soil borings <br /> SB-3 and SB-4). <br /> 5. Petroleum hydrocarbons and BTEX compounds appear to be present in a limited area <br /> beneath the former gasoline storage tank at depths greater than 31 ft. bgs, and at 20 ft. <br /> bgs in the SB-2 area. Although petroleum concentrations were elevated at the 31 ft. <br /> depth directly below the former gasoline tank, subsequent soil data indicates the <br /> concentrations decrease to less than 0.0098 mg/kg for BTEX compounds and 0.014 <br /> mg/kg for TPH as gasoline at 50 ft. bgs in adjacent borings (SB-1 and SB-2). <br /> Analytical data indicates that the groundwater beneath this site has not been impacted by <br /> petroleum products released from the underground storage tank. Soils at the site are <br /> contaminated with low concentrations of petroleum products at depths greater than 31 ft. bgs to <br /> approximately 50 ft. bgs, although concentrations are near the analytical method detection limit <br /> at the 50 ft. depth. <br /> 6 <br />