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ATC Associates SITE SAFETY PLAN <br /> FACILITY BACKGROUND <br /> In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing <br /> equipment were removed and transported off-site. Laboratory analysis of soil samples <br /> collected from beneath the former 1,500-gallon UST location indicated the presence of <br /> detectable concentrations total petroleum hydrocarbons. Discoloration of soil and a <br /> petroleum hydrocarbon odor were noted in the field. After the tanks were removed, the <br /> areas of the former tanks were backfilled. <br /> On November 14, 1997, a geologist from ATC Associates supervised the advancement of <br /> two soil borings to 30 feet below ground surface (bgs). Samples were analyzed for <br /> petroleum hydrocarbons and elevated concentrations of petroleum hydrocarbons were <br /> detected in soil and groundwater samples. On July 13, 1998, a geologist from ATC <br /> Associates supervised the advancement of four soil borings to 30 feet below ground surface <br /> (bgs). Samples were analyzed for petroleum hydrocarbons and elevated concentrations of <br /> petroleum hydrocarbons were detected in soil and groundwater samples. <br /> WORKPLAN <br /> Supervise the advancement of three soil borings to 40 feet bgs and complete the <br /> borings as groundwater monitoring wells. At least two soil samples will be collected <br /> from each soil boring and one groundwater sample will be collected from each well <br /> after well development. Samples will be analyzed for TPHg (EPA Method 8015 <br /> Modified), BTEX (EPA Method 8020), and oxygenate fuel additives (EPA Method <br /> 8260). <br /> PAGE 4 <br />