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1 <br /> ALTERNATIVE A 3 <br /> 1 Supporting Calculations <br /> ' 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 63/27 f0/yd'=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'Vii+(15'L x l0'H x 20'W)=25,950 ft3/27 ft3/yd3 =961 yd3, <br /> 961 yd3 x 168 tons/yd3= 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/ft3 <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 /> ' • MW-4(1,100+85) <br /> HA-8 (490+ 3 3)&(690+37) <br /> HA-9(1,500+660) <br /> 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 /> ' <br /> { 229�33 lbs 3 impactedm Avg TPHd&g concentrationy 1,000,000= <br /> soil x 3,604 33 Pig <br /> TPHd&pound g <br /> Cost per <br /> 11,639 60 lbs ofTPHd&g to be removed <br /> ' <br /> P P <br /> ' Cost estimate range from preceding page $276,300 00 to $322,500 00 <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 /> t ' <br /> 1 <br /> R 1CONTGR.AN1Stockton\CAPICap Addendum Costs&Supporting Catcs <br />