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5 <br /> ' ALTERNATIVE A 1 <br /> Supporting Calculations <br /> 1 Proposed Excavation Dimensions and Soil VolumeJWeight Calculations: <br /> Overburden Soil 67 5' L x 10' H x 20' W= 13,500 ft3/27 ft/yd'=500 yd' <br /> 500 yd x 168 tons/yd3 =840 tons x 2,000 lbs/ton= 1,680,000 lbs of overburden <br /> Soil for Disposal 67 5' L x 17' H x 20'W= 22,950 ft/27 f/yd3=850 yd3 <br /> 850 yd3 x 168 tons/yd'= 1,428 tons x 2,000 lbs/ton=2,856,000 lbs of soil to be disposed <br /> Soil Density Assume 168 tons/yd'or 125 lbs/ft <br /> Average TPH in soil to be removed: <br /> ' Based on TPHd and TPHg at each known sample location within area of proposed excavation <br /> including samples from <br /> SB-1 (3,500+ 120)&(6,800+89) <br /> SB-2(4,100+88) <br /> MW-2(14,000+870)&(1,500+ 110) <br /> lie MW-4(1,100+85) <br /> HA-8(490+ 3 3)&(690+37) <br /> HA-9(1,500+660) <br /> Total TPHd&g from 9 samples=35,742 3 mg/Kg TPHd&g/9 samples=3,9714 Avg TPH <br /> (2,856,000 lbs impacted soil x 3,9714 mg/Kg Avg TPHd&g concentration)/ 1,000,000= <br /> 11,342.32 lbs of TPHd&g to be removed <br /> ' Cost per pound TPHd&g: <br /> Cost estimate range from preceding page $254,49142 to$298,517 83 <br /> $254,49142 low range cost/ 11,342 32 lbs TPHd&g=$22 4411b TPHd&g removed <br /> $298,517 83 lugh range cost/ 11,342 32 lbs TPH d&g=$26 32/lb TPHd&g removed <br /> R=NTGRA IIStockton\CAP\Cap Addendum Costs&Supporting Calcs <br />