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• <br /> • SOIL CONTAMINATION <br /> Previous AEMC studies at the site have concluded that hydrocarbon contamination is <br /> present in the former T-3 UST excavation (Figure 3). All other areas associated with the <br /> tank excavations have proven to be free of detectable hydrocarbon concentrations <br /> • <br /> Soil samples collected and analyzed during the Phase R investigation show that detectable <br /> concentrations of petroleum hydrocarbons are found in two of the six borings at the <br /> T-3 UST site. All other soil samples analyzed show concentrations non-detected (ND) at <br /> or above the laboratory reporting limit for the analyzed constituents The contamination is <br /> confined to borings B-3 and B-4 in an interbedded clay/silt layer, at a depth of 10 to 15 feet <br /> • bgs Contamination levels in this area range between 380 to 8,000 ppm TPH-D Soil <br /> samples collected and analyzed at 20 feet, 25 feet, and 30 feet bgs show ND concentrations <br /> of analyzed constituents (TPH-D) The contamination was ND below the 15 foot sample <br /> interval, and it is, therefore, concluded that the vertical migration of the contaminant has <br /> not advanced beyond this point <br /> • <br /> • <br />• <br />• <br /> ,1h1a W(MIa) Page 7 <br />• AMERICAIM <br /> 4NvliWw.(NTµ^.nwnCi n.SNT[G'i'g <br />