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). H. KLEINEELDER&ASSOCIATES <br /> screening purposes; costs will be evaluated to achieve an accuracy level <br /> within an order of magnitude (-50 Co +100 percent). Alternatives with <br /> costs an order of magnitude greater than others that do not provide <br /> i substantially greater environmental. or public health benefits will be <br /> F eliminated from further consideration. <br /> €kk <br /> 3.6.1 IN-SITU BIORECLAMATION <br /> E.g <br /> In-situ bioreclamation of contaminated ground water is an emerging <br /> technology. This technique employs the introduction of biological <br /> nutrients to the contaminated ground water through an injection well (see <br /> i; <br /> Figure 3.6.1). The nutrients accelerate the contamination biogradation <br /> process in naturally occurring biological media. Although this technique <br /> to has been demonstrated to be effective at certain contaminant sites, there <br /> are inherent limitations to its wide spread use. Contaminant type and <br /> EK concentration, site specific geologic, hydrogeologic, and environmental <br /> F <br /> factors contribute heavily to the performance of this technique. <br /> TECHNICAL FEASIBILITY SCREERINg <br /> 1. Technical Reliability <br /> 1e <br /> f ° The in--situ bioreclamation technique has had both positive and negative <br /> reaults. This technology has not been developed fully to provide <br /> E � assurance of performance and reliability for hydrocarbon contaminated <br /> ground water remediation over a wide range of geohydrologic conditions <br /> Furthermore, difficulties arise in assessing the effectiveness of this <br /> technique from finite monitoring point locations. <br /> 2. Implementability <br /> Due to the mixed results (positive and negative) this technique has <br /> t exhibited, implementation at this site may be delayed or rejected by <br /> regulatory agencies. These agencies are generally more amenable to proven <br /> technologies with greater levels of_performance. <br /> 33-=87-887 13 <br />