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ALTERNATIVE A 3 <br /> 1. <br /> Supporting Calculations <br /> 1 <br /> 1 Proposed Excavation Dimensions and Soil Volume/Weight Calculations: <br /> Overburden (67 5' L x 10'H x 20' W)+(15' L x 15' H x 20' D)= 18,000 ft 1271 /yd3=667 yd' <br /> ' 667 yd'x 168 tons/yd'= 1,120 56 tons x 2,000 lbs/ton=2,241,120 lbs of overburden <br /> Soil Disposal (67 5'L x 17'H x 20'W)+(15'L x 10' H x 20'W)=25,950 ft/27 ft3/yd3=961 yd' <br /> 1 961 yd'x 168 tons/yd'= 1,614tons x 2,000 lbs/ton=3,229,333 lbs of soil to be disposed <br /> Soil Density Assume 168 tons/yd3 or 125 lbs/W <br /> 1 <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 /> 1• MW-4(1,100+85) <br /> HA-8(490+3 3)&(690+37) <br /> HA-9(1,500+660) <br /> 1 MW-3 (270+31) <br /> Total TPHd&g from 10 samples=36,043 3 mg/Kg TPHd&g/ 10 samples=3,604 33 Avg <br /> TPH <br /> ' (3,229,333 lbs impacted soil x 3,604 33 mg/Kg Avg TPHd&g concentration)/ 1,000,000= <br /> 11,639 60 lbs of TPHd&g to be removed <br /> ' Cost per pound TPHd&g: <br /> Cost estimate range from preceding page $276,300 00 to$322,500 00 <br /> i <br /> $276,300 00 low range cost/ 11,639 60 lbs TPHd&g=$23 73/lb TPHd&g removed <br /> $322,500 00 high range cost/ 11,639 60 lbs TPH d&g=$27 70/lb TPHd&g removed <br /> i <br /> 1 <br /> R ICONTGRAN1Stockton\CAPlCap Addendum Costs& Supporting Calcs <br /> 1 <br />