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• <br /> MASS BALANCE CALCULATION <br /> Mass Balance Calculation <br /> Mass balance calculation as follows <br /> Substance Impacted <br /> Impacted area <br /> UST pit (east end) (See attached figure) <br /> Volume of Area 1 (V 1) = (length) X (width) X (depth) <br /> = (9 feet) X(55 feet) X (38 feet) <br /> = 18,810 ft' = 697 yds3 = 906 tons <br /> Volume of Area 2 (V2) = 1/2 X (8 feet) X (27 feet) X (38 feet) <br />• =4,104 ft = 152 yds3 = 198 tons <br /> Average TPH <br /> concentration= 2/3 X (Avg Concentration of Samples S-6 through <br /> S-9, SW-2, SW-3, and TP-1) <br /> = 486 ppm <br /> (Two-thirds of the average concentration is considered conservative <br /> Additionally, the estimated area of impact is based on the <br /> assumption that impacted soil was present at uniform concentration <br /> from the surface to 20 feet bgs and attenuated to non-detect from 20 <br /> feet bgs to the clay layer at 38 feet bgs) <br /> Mass TPH in Areas 1 and 2 <br /> before remediation= [(V I + V2) X (2,000 lbs/ton) X(486 ppm)]/1 E6 <br /> = 1,073 pounds <br /> Waste Oil UST pit (Sept 1989) (See attached figure) <br /> Volume of Area 3 (V3)= (16 feet) X (5 5 feet) X (36 feet) <br /> = 3,168 ft-3 = 117 yds3 = 152 tons <br /> Average TPH <br /> concentration = 2/3 X (Avg Concentration of Samples S-I and S-2) <br /> • = 199 ppm <br /> 9201036A/MASSBAL DOC .lune 4, 1997 <br />