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I . <br /> Harding Lawson Associates <br /> would be left in place. Because Southland's plans currently call <br /> for removal of all underground tanks during 1989, this work could <br /> be done at the same time, allowing an overall cost savings. <br /> The main costs associated with this alternative are <br /> those of removing and treating excavated soils. This alternative <br /> could involve temporarily closing the site to bus:,ness, but would <br /> not require destroying the store. <br /> - Chemical data collected to date indicate areas where <br /> TPH concentrations in soils exceed 100 ppm. These soils would <br /> i <br /> have to be treated prior to disposal or disposed of in a Class I <br /> landfill. <br /> t.a Assuming the work can be carried out in conjunction`., <br /> with tank removal, that no more than 500 cubic yards of soil <br /> require aeration, and that all soil can eventually be disposed of <br /> at Class ITI''landfill, the estimated cost of this alternative <br /> _ I <br /> with open-air aeration would range from $15,000 to $18,000. if <br /> F <br /> "heap°' aeration is performed (assuming soil-venting is insti- <br /> tuted). the cost would range from $12,000 to $15,000. <br /> 3. Soil-ventjMg - This alternative involves placing a <br /> series of horizontal vapor extraction wells in the vadose zone <br /> ^nd sucking volatilized hydrocarbons from the soil. The <br /> hydrocarbon-laden - <br /> �„. gases would be passed through a series of s - <br /> carbon contactors to remove hydrocarbon constituents prior to <br /> discharge to the atmosphere. The implementation of this alter ` <br /> i <br /> native would involve several <br /> s� phases, including design, <br /> Permit- <br /> f <br /> ting, construction, startup, and operation. Theredes' <br /> p ign cost <br /> L,j <br /> i <br /> f �.. ... 24 <br /> ti <br />