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'} L .. .' - R6' <br /> .�.y - w <br /> 4 <br /> MIN11-M- <br /> W&Ddward-Clyde Consuliz:ns <br /> 5 2 Ly- As a technology, fixation suffers from several drawbacks, <br /> Chief among these is that a large portion of the contaminants at the altsa� Shop lng- are <br /> dissolved-phase hydrocarbons. A fixative agent would have to be <br /> weathering by groundwater and capable cf solidifying a dissolved pollutant; both difficult <br /> to achieve. In addition, fixitive agents must be bench-scale tested to evaluate their <br /> potential to further pollute the groundwater or form toxic by-products. There would also <br /> be a need for numerous closely-spaced injection wells to apply the fixative, since fixation <br /> will lower hydraulic conductivities near the injection wells reducing their radius of <br /> influence. Hydrocarbons are not removed when fixation is implemented; there is a <br /> possibility that the chemical reactions may be reversed with time, allowing hydrocarbons <br /> to again migrate with groundwater flow. Soil fixation is not considered further. <br /> 5.2.6 Soil Wasrina Soil washing is eliminated from consideration because contaminants <br /> at the site exist primarily in the dissolved phase and the technology is not applicable. The <br /> ature, difficult to manage, and may require excavation. <br /> technology is also relatively imm <br /> 5.2.7 nff-Site Landfilling off-site landfilling is not considered a viable alternative <br /> because dissolved-phase hydrocarbons will remain in the groundwater after the soil is <br /> removed. This alternative must be implemented in conjunction with extraction and <br /> treatment, an alternative that by itself can remediate the site. The permanent liability <br /> associated with the hazardous waste regardless of where it is transported, make this an <br /> unattractive alternative. <br /> , <br /> i <br /> 4 <br /> rl <br /> f <br /> 3 <br /> 25 <br />