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V <br /> No evidence of leakage from the UST itself was reportedly observed(Bowen Construction- <br /> Engineering(1998). However, ST&E personnel were reported to have observed leakage <br /> emanating from around a corroded coupling in the piping system between the UST and the fuel <br /> dispenser at the 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 /> and USEPA Test Method 8020 for benzene,toluene, ethylbenzene, and xylene (BTEX). The two <br /> soil samples were collected and analyzed in November, 1998 and were reported to contain barely i <br /> detectable concentrations of BTEX but were confirmed to contain TPH-d concentrations ranging <br /> from 410 to 4900 mg/kg. <br /> Four soil samples were collected from the two stockpiles and composited into two samples <br /> during November, 1998. The soil samples were analyzed using the USEPA analytical Test <br /> Methods described above. TPH-d was reported to be present in all of the samples and was <br /> reported to range from 200 to 990 mg/kg. Benzene and ethylbenzene were reportedly not <br /> detected in any of the soil samples. Toluene and xylene were detected at extremely low <br /> concentrations. Analytical laboratory results are tabulated in Table 1. <br /> The excavated soil was subsequently returned to the former UST excavation and covered with <br /> visquin to assist in retarding downward migrating water in the vadose zone mobilizing the TPH-d <br /> contained in the soil contaminant mass and underlying in-place TPH-d contaminate mass still <br /> present in the subsurface. Additional imported clean soil was placed on top of the visquin to <br /> bring the excavation to surface grade, and a thin layer of crushed rock(railroad ballast)was <br /> poured over the surface to match the surrounding area. <br /> PHSEHD directed ST&E in a letter dated January 13, 1999 that additional site assessment work <br /> would be required to determine if soil and/or groundwater at the site had been contaminated with <br /> petroleum hydrocarbons. ST&E retained Upgradient Environmental Consultants((Jpgradient)to <br /> M ainOTnvironmcntalVlSTESWorkpltn%W orkplan l 1192007.wpd b <br /> I <br /> II <br /> I <br /> I' <br />