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ATCAssociates SITE SAFETY PLAN <br /> FACILITY BACKGROUND <br /> On October 15, 1986, two 500-gallon gasoline underground storage tanks (USTs) were <br /> removed from the site. During removal of the USTs, petroleum product was noted in the <br /> southern UST excavation. Soil samples were collected from 2 feet below the bottom of the <br /> USTs, and petroleum constituents and lead were detected in the soil samples. <br /> On July 18, 1995, Smith Technology supervised the installation of three groundwater <br /> monitoring wells, MW-1, MW-2, and MW-3. Analytical results of the soil and <br /> groundwater samples collected indicated elevated concentrations of petroleum <br /> hydrocarbons were present in the soil and groundwater downgradient of the former UST <br /> locations. <br /> On September 24 and October 2, 1996, Smith Technology conducted an additional <br /> subsurface investigation at the site. A total of 9 soil borings were advanced to depths up to <br /> 15 feet below,ground surface. Soil, soil. vapor, and groundwater samples were collected <br /> from the borings. Analytical results of the soil and groundwater samples indicated the <br /> general extent of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), and methyl tertiary butyl ether (MTBE) in soil and <br /> groundwater under the site. <br /> WORK PLAN <br /> Task One: <br /> Supervise the advancement of three soil borings to 28 feet bgs. Supervise the <br /> installation of three groundwater monitoring wells to a depth of approximately 28 <br /> feet bgs. At least two soil samples will be collected 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), benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX, EPA Method 8020), and oxygenate fuel additives (EPA Method 8260). <br /> I <br /> PAGE 4 <br />