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MASS BALANCE CALCULATIONS <br /> (Soil) <br /> Area 1: Former UST Pit. <br /> 33'x40'x9' = 11,880 ft3/27ft'=440 yds' <br /> XBenzene=(2 1+2 4+16+12+0 70+0 18+0 010+<0 005)18= 102 ppm <br /> 440 yds'(1 4tons/yds3)(2000lbs/1 ton)(1 02 Benzene/1 x 106 lbs soil)= 13 lbs Benzene <br /> Area 2A. Dispenser Islands. <br /> 23'xl8'x6' =2,484/27ft3 =92 yds3 <br /> xBenzene=(0 33 ppm) <br /> 92 yds'(1 4tons/yds3)(2000lbs/1 ton)(0 33 lb Benzene/1 x 106 lbs soil)=0 091b Benzene <br /> Area 2B: Dispenser Islands <br /> 23'x30'x6' =4,140 ft3/27ft' = 153 yds' <br /> XBenzene=(0 11+0 016)12= 0 06 ppm <br /> 153 yds3(1 4tons/yds')(2000lbs/1 ton)(0 06 lb Benzene/1 x 101 lbs soil)= 0 03 lb Benzene <br /> Area 3: Current UST Pit. <br /> 36'x59'x7' = 14,868 ft'/27ft'= 551 yds' <br /> xBenzene=(0 59+0 12+0 080+0 16+0 020)/5 =0 19 ppm <br /> 551 yds'(1 4tons/yds3)(20001bs/1 ton)(0 19 lb Benzene/1 x 106 lbs soil)= 0 3 lb Benzene <br /> Area 4: Waste Oil UST. <br /> 7'xl4'xl' =98 ft'/27ft'=3 6 yds' <br /> xBenzene=(<0 005+0 0056)/2=0 0053 ppm <br /> 3 6 yds3=(1 4tonslyds3)(20001bs11 ton)(0 0053 lb Benzene/1 x 10'lbs soil)=0 00005 lbs Benzene <br /> . Total lbs of Benzene: approximately 1.7 lbs in soil beneath the site. <br />