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Given the following assumptions, <br /> C The average concentr;elations of the constituents of concern are assumed <br /> to be distributed uniformly throughout the volume of impacted soil <br /> • Soil density = 110 pound (Ib)/cubic foot; and <br /> • 1 part per million-(ppm) = 1 pound contaminant per 1 million pounds of <br /> soil <br /> the hydrocarbon mass in soil priorto remediation is calcuElated as follows: <br /> TPHg upper cylinder= (25 132)43-s9i 1 10.4b-G9il 3 163 Ib TPH = 8,744 Ib TPH-as-gas <br /> (ft 60) (101) -sec 4} <br /> Benzene uppercylinder— (25,132)# .L6e+I1f1.10-It3-seit)(9.7 Ib benzene) = 26.9 Ib Benzene <br /> (ftseR} (106 tb <br /> TPHg lower sY cinder= (98,960)tsq 1104 -�)(2.5 Ib TPH `27.2 Ib'TPH-as- asoline <br /> _ <br /> (#terse 4) <br /> ,:,!(l or, <br /> ,, 106 tb seal) ` <br /> .Ir <br /> k <br /> Benzene upper cylinder= (98,960)43-s 41(1 10 4-ss+4)(0.2 Ib benzene) = 2.0 Ib Benzene <br /> (es:0.9 (106 tb sed} <br /> TPHg iolai mass = 8,744 Ib + 27.2.lb = 8;77142 pounds <br /> Benzene total ma's-s- = 26.9 Ib + 2.0.1 <br /> b- 28.9 pounds <br /> ( As indicated in the mass calculations; approximately 99.7% of the TPH-as-gasoline <br /> �P9 mass and 93.1% of the benzene mass in soil prior to remedial activities was # <br /> _ concentrated between 10 and-30 fee# bgs. <br /> SII <br /> Petroleum Hydrocarbon Mass in Soill(Post-Remediation)E <br /> According to ENSR, approximately one year of soil vapor:extr'action system removed <br /> over 7,000 pounds of gasoline hydrocarbons from the subsurface. Based on the ! <br /> analytical results from the post-SVE�,'confirmation soil boring drilled through the former <br /> U i <br /> UST source area (Table 5), SVE was effective in removing all of the benzene, all of the I <br /> TPH-as-gasoline in the lower cylinder,.and most of the 7 H-as-gasoline in the upper <br /> cylinder. <br /> i.f <br />- t r <br />