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' ALTERNATIVE A 2 <br /> . i <br /> Supporting Calculations <br /> I <br /> ' Proposed Excavation Dimensions and Soil VolumelWeight Calculations: <br /> Overburden (67 5' L x 10'H x 20' W)+(15' L x 15' H x 20'D)= 18,000 t/27 fly/yd3=667 yd3 <br /> 667 yd'x 168 tons/yd'= 1,120 56 tons x 2,000 lbs/ton=2,241,120 lbs.of overburden <br /> Sailfor Disposal 77' L x i 1' H x 20' W= 16,940 fl 27 ft/yd3 =627 40 yd3 <br /> ' 627 40 yd'x 168 tons/yd'= 1,054 tons x 2,000 lbs/ton=2,108,089 lbs of soil to be disposed <br /> Soil Density Assume 168 tons/yd3 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 @15' (3,500+ 120) <br /> SB-2 @15' (4,100+88) <br /> MW-2 @20' (14,000+870) <br /> ' . MW4 @20' (1,100+85) <br /> MW-3 @20' (270+31) <br /> Total TPHd&g from 5 samples=24,164 mg/Kg TPHd&g/5 samples=4,832 8 Avg TPH <br /> t (2,108,089 lbs impacted soil x 4,832 8 mg/Kg Avg TPHd&g concentration}/ 1,000,000= <br /> 10,187 97 lbs of TPHd&g to be removed <br /> ' Cost per pound TPHd&g: <br /> Cost estimate range from preceding page without shoring $147,45128 to$179,643 59 <br /> $150,85128 low range cost/ 10,187 97 lbs TPHd&g=$14.81/lb TPHd&g removed <br /> ' $183,043 59 lugh range cost/ 10,187 97 lbs TPH d&g=$17 97/lb TPHd&g removed <br /> ' Cost estimate range from preceding page without shoring or dewatenng <br /> $124,05128 low range cost/ 10,187 97 lbs TPHd&g=$12 18/lb TPHd&g removed <br /> 5 <br /> $145,543 59 lugh range cost/ 10,187 97 lbs TPHd&g=$14,29/1b TPHd&g removed <br /> R ICONTGRAN1StocktonlCAPICap Addendum Costs& Supporting Calcs <br /> 1 <br />