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IALTERNATIVE A 1 <br /> Supporting Calculations <br /> Proposed Excavation Dimensions and Soil Volume/Weight Calculations: <br /> Overburden Soil 67 5' L x 10' H x 20' W= 13,500 ft 127 ft/yd'=500 yd' <br /> 500 yd3 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 fO/27 ft/yd3=850 yd <br /> j850 yd'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/f13 <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 /> lieMW-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 44/lb TPHd&g removed <br /> $298,517 83 high range cost/ 11,342 32 lbs TPH d&g=$26 32/lb TPHd&g removed <br /> l <br /> R ICONTGRAN\Stockton\CAMap Addendum Costs&Supporting Cales <br />