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• <br />ATC SITE SAFETY PLAN <br />FACILITY BACKGROUND <br />In February, 1991, one 500 -gallon UST of unknown fuel was removed; in August, 1991, one <br />550 -gallon unleaded gasoline UST was removed; in October, 1991, 47 feet of single wall <br />piping was removed; and, in December, 1991, one 7,500 -gallon unleaded gasoline UST was <br />removed. Laboratory analysis of soil samples collected from beneath the former USTs and <br />piping locations indicated the presence of detectable concentrations total petroleum <br />hydrocarbons. Discoloration of soil and a petroleum hydrocarbon odor were noted in the <br />field. After the tanks were removed, the areas of the former tanks were backfilled. <br />In April, 1998, an ATC geologist supervised the advancement of sig soil borings to 21 feet <br />below ground surface (bgs). Analytical results indicated that the selected soil samples and <br />the grab groundwater sample from boring S116 contained detectable concentrations of <br />petroleum hydrocarbons. <br />In September, 1998, an ATC geologist supervised the advancement of five soil borings to <br />depths ranging from 5 to 31 feet below ground surface (bgs). Analytical results of soil <br />samples indicated the presence of petroleum hydrocarbons. One groundwater sample was <br />collected from each boring at the depth groundwater was first encountered. Groundwater <br />samples indicated the presence of petroleum hydrocarbons. <br />WORK PLAN <br />Task One: <br />Supervise the advancement of two soil borings to 35 feet bgs, one soil boring to 45 <br />feet bgs, and complete the borings as groundwater monitoring wells. At least two <br />soil samples will be collected from each soil boring and one groundwater sample will <br />be collected from each well after well development. Samples will be analyzed for <br />TPHg (EPA Method 8015 Modified), TPHd, (EPA Method 8015), BTEX (EPA <br />Method 8020), and oxygenate fuel additives (EPA Method 8260). <br />PAGE 4 <br />