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i <br /> 2.2 Underground Storage Tank Removal <br /> l; <br /> In November 1998, one 10,000 gallon diesel underground storage tank was removed from the <br /> E locomotive shop by Bowen Construction (Bowen, 1998) (Figure 5).. During the tank removal, <br /> petroleum hydrocarbon contaminated soil was observed to be present at the base of the tank <br /> i excavation, and diesel hydrocarbons were reportedly detected in soil samples collected from the <br /> UST excavation floor(Figure 5). The tank was reportedly disposed of at the Erickson, Inc. <br /> facility located in Richmond, California (Bowen, 1998). <br /> f <br /> h <br /> In order to support the UST removal and subsequent.minor over-excavation to collect bottom <br /> samples within the former UST pit 28 cubic yards of petroleum hydrocarbon contaminated soil <br /> was reportedly excavated. This soil was reported to have been stockpiled into two stockpiles <br /> adjacent to the former UST pit (Figure 5). <br /> No evidence of leakage from the UST itself was reportedly observed according to the report <br /> prepared by Bowen (1998). However, ST&E personnel observed leakage emanating from <br /> around a corroded coupling in.the piping system between the UST and the fuel dispenser at the <br /> i <br /> ground surface. <br /> Two soil samples were collected from beneath the former UST location at a depth of <br /> approximately 14 feet bgs{Figure 5). The soil samples were analyzed by U.S. Environmental <br /> Protection Agency(USEPA) Test Method 8015M for Total Petroleum Hydrocarbons as diesel, <br /> i <br /> and USEPA Test Method 8020 for benzene,toluene, ethylbcnzene, and xylene (BTEX). The two <br /> i <br /> soil samples were collected and analyzed in November, 1998 and were reported to contain barely <br /> detectable concentrations of BTEX but were confirmed to contain TPH-d concentrations ranging <br /> i <br /> from 410 to 4900 mg/kg. <br /> i <br /> Environmental\STE\PARSCR09102008.wpd 5 <br />� h <br /> 4 <br />