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CONCLUSIONS: <br /> The residual soil contamination beneath the former UST pit presents no unacceptable health risk <br /> for toxic or carcinogenic effects under either residential or commercial property uses. <br /> ' CONTAMINANT MASS CALCULATIONS <br /> ' Soil: <br /> The limits of impacted soil (zero line) were determined from historical non-detect data points <br /> ' (approximate radius of 15 feet, an area of 700 ft). The thickness of affected soils is 15 feet <br /> (17.5-32.5 ft. bgs). Consequently, the volume of affected soil is 10,500 fe . We used the <br /> generic soil bulk density value of 100 lblfe (45.5 kg/ft) in the contaminant mass calculations. <br /> The average concentration for each contaminant is the average concentration within the affected <br /> soil interval in boring MW 1 divided by two. <br /> Mass of TPHG = 4,410 lbs <br /> ' Conc. of TPHG = 4,200 mg/kg <br /> Mass of Benzene = 0.66 lbs <br /> ' Conc. of Benzene = 0.63 mg/kg <br /> Mass of Toluene = 0.66 lbs <br /> Conc. of Toluene = 0.63 mg/kg <br /> Mass of Ethylbenzene = 23.3 lbs <br /> ' Conc. of Ethylbenzene = 22.2 mg/kg <br /> Mass of Xylenes = 94.5 lbs <br /> Conc. of Xylenes = 90.0 mg/kg <br /> valleyvwlrcporfslrhel.hd <br /> y 6 <br />