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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. Soil sample analytical laboratory results are tabulated in Table 3. <br /> The excavated soil was subsequently returned to the former UST excavation and covered with <br /> visqueen to assist in retarding downward migrating water in the vadose zone. This action was <br /> done with the concept of preventing the downward mobilizing of the.TPH-d contained in the soil <br /> 4 contaminant mass and underlying in-place TP.H-d contaminate mass still present. in the <br /> subsurface. Additional imported clean soil was placed on top of the visqueen to bring the <br /> excavation to surface grade, and a thin layer of crushed rock(railroad ballast) was poured over <br /> } <br /> 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 (Upgradient)to <br /> complete the site assessment work. <br /> A workplan was submitted to PHSEHD during June, 1999 (Upgradient, 1999a). Upgradient <br /> reportedly conducted a sensitive receptor survey in the vicinity of the site in June,1999 the results <br /> of which were included in the workplan submitted to PHSEHD. The results of that sensitive <br /> receptor survey identified ten private wells within a 2,000-foot radius of the site; the nearest one <br /> being owned by the ST&E. This well is located at the west.(front) end of the locomotive service <br /> building, approximately 300 feet west of the underground tank site <br /> Environmental\STEPARSCRO 9102008.wpd 6 <br /> i <br />