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I <br /> I <br /> I <br /> MASS BALANCE CALCULATION <br /> Mass Balance Calculation <br /> Mass balance calculation as follows <br /> Substance Impacted <br /> Impacted area <br /> Dispenser(west island) (See attached figure) <br /> Volume of Area 1 (VI)=(length) X(width) X (depth) <br /> = (15 feet)X (3 feet) X(23 feet) <br /> = 1035 ft3 = 38 yds3 =49 4 tons <br /> Average TPH concentration= 213 X(Avg Concentration of <br /> • Samples (D-5-3 0, DX-E-7 0, and DX-13-8 0) =213 X (Avg 12, <br /> 260, and 14 = 91 13) = 61 ppm <br /> (Two-thirds of average concentration is conservative <br /> Additionally, the estimated area of impacted soil is based on the <br /> assumption that impacted soil was present at uniform concentration <br /> from the surface to 8 feet below grade surface (bgs) and attenuated <br /> to nondetectable levels from 8 feet bgs to the clayey silt layer at 23 <br /> feet bgs) <br /> Mass TPH in Area 1 before remediation <br /> = [(VI) X(2,000 lbs/ton) X(61 ppm)]/1E6 <br /> = 6.0 pounds <br /> Total Original Mass of TPH=6.0 pounds <br /> Substance Remediated (by excavation and disposal) <br /> Dispenser(west island) <br /> Volume of Area 1 (VI)= (length) X(width) X (depth) <br /> = (10 feet) X(9 feet)X (7 feet) <br /> = 720 ft3 = 27 yds3 = 30 tons <br /> 9201026A/MASSBAL DOC lune 16, 1997 <br />