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x <br /> 37 <br /> GOLDEN GRAIN COMPANY <br /> December 21, <br /> 202/799-5045.06 cap would <br /> hydrocarbons from the surrounding environment. A <br /> ticalL <br /> miinto the <br /> nate infiltration and prevent further ver <br /> reduce or elsaturat- <br /> mi.g.ration of hydrocarbons from the vadose zon- <br /> ed zone. Slurry walls would slow the flow of <br /> lwofgrounof dwater across <br /> the site, thereby preventing lateral migration <br /> hydrocarbons. However, slurry walls must be "anchored" or <br /> �, geologic *ormation with a low permeability to <br /> "keyed into a g g low-permeability Lormation <br /> prevent leaking. The only significant <br /> ` <br /> 48 feet.at this site is at a depth of <br /> which would make this <br /> alternative very difficult and expensive to implement. <br /> Physical containment Advantages: <br /> 1, Slows rate of hydrocarbon migration. <br /> 2. Minimizes potential exposure routes. <br /> physical containment Disadvantages: <br /> 1. May not be technically feasible. <br /> 2. Does not address removal or treatment of hydrocarbons- <br /> u. 3. Effectiveness depends on very exacting construction <br /> techniques. <br /> 4. Requires long-term maintenance to maintain structural <br /> integrity. <br /> 5. High cost. <br /> --------- -------- <br /> _ -physical-containment_is not viable at this site because <br /> �- ive depth to which the slurry walls would need- o - <br /> be <br /> the excess <br /> GROUNDWATER <br /> TECHNOLOGY.INC. <br />