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Alternatives Al, A2, and A3 address removal of the soil source that contributes to the petroleum <br /> . hydrocarbons detected in the groundwater at this facility Table 7 presents a comparison of the <br /> ' cost, mass removed, and cost per pound of TPH removed for each alternative in the October <br /> 2004 CAP and in this Addendum The most effective alternatives are Al, A2, and A3, as shown <br /> below <br /> Alternative <br /> ' Al A2 A3 <br /> ' Excavation Removal of Excavation 5' Into Excavation- 14'-17'Into <br /> TPH to 500 mglkg 14'-17' Watertable Laterally to Watertable Laterally out to <br /> Into Watertable MW-3 MW-3 <br /> ' Cost $254,500 to $298,500 $151,000 to$183,000 $276,300 to$322,500 <br /> Pounds TPH (,•d)To 11,300 lbs TPH(,.(,) 10,200 lbs TPH(9.0) 11,600 lbs TPH(9-d) <br /> Be Removed <br /> Cost per Pound of $22 40/lb to $26 3011b $14 80/lb to$18 0011b $23 70/lb to $27 7011b <br /> • TPH( .D)Removed TPH(9+d) TPH(a.a) TPH(g+d) <br /> ' Alternative A2 --Removal of soil at the soil/ground water interface and to the top 5 feet of the <br /> water table-- is the most cost-effective solution as the costs of shonng are avoided and the <br /> hydrocarbon mass removed is comparable to those alternatives with shonng The removal <br /> ' efficiency of Alternative A2 addresses the free product and petroleum material at the soiVwater <br /> interface and contamination in the five feet of the water table Alternative A2 removes the mass <br /> reasonably accessible and provides the same remedial action time as the more expensive CAP <br /> Options, such as Alternatives 3, 4 and 5 The addition of calcium peroxide will provide an <br /> oxygen source to enhance degradation of the residual Alternative A2 is the most cost-effective <br /> with regard to cost per pound of TPH removed because Alternative A2 removes 87% of the TPH <br /> ' associated with Alternative Al or A3 at a much lower cost The driving factor in the cost <br /> diffeience between these options is primarily related to shonng costs Based upon this analysis, <br /> Alternative A2 is the recommend remedial action <br /> 1 <br /> • <br /> ' 20 <br /> ' R 1C011 rGRAN1S1oc6Lon1CAPICAP ADDENDUM <br />