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ALTERNATIVE 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'/27 f/y&=500 yd3 <br /> 500 yd3 x 1.68 tons/yd'=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 f&27 t/yd3=850 yd' <br /> 850 yd'x 1.68 tons/yd3= 1,428 tons x 2,000 lbs/ton=2,856,000 lbs of soil to be disposed <br /> Soil Density:Assume 1.68 tons/yd'or 125 lbs1ft <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 /> 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=3,971.4 Avg.TPH <br /> (2,856,000 lbs impacted soil x 3,971.4 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: $254,491.42 to$298,517.83 <br /> $254,491.42 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 /> R:IC0NTGRAN1Stockton\CAPICap Addendum Costs&Supporting Calcs <br />