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t �P- Biofeasibility and Biotreatability Investigations - As previously indicated, the effective and successful use of bioremediation is often contingent upon evaluations which assess the appropriateness of the treatment method for a given site (biofeasibility) as well as the site-specific microbiological and physicochemical conditions f necessary for optimal bioremedial activity and efficiency (biotreatability). Oftentimes, these evaluations are required by regulatory agencies as a prerequisite to project approval. Failure 1_ to adequately evaluate these parameters can often lead to project failures, wasted resources, �- and considerable monetary loss. Biofeasibility Biofeasibility decisions are based upon evaluating technical, practical; economic, and regula- tory factors. Evaluations performed to establish feasibility generally include site characteriza- tion and determination of the presence of inhibiting/limiting site conditions. I As previously described, site data review typically includes a thorough review of applicable site assessment !'information, site operations, and pertinent regulations.: Additionally, inter- if views with site 1,personnel and a visit to the facility are often performed. The information gathered from these sources is utilized to determine whether or not bioremedial treatment is a viable and appropriate method for the given site. During the site characterization process, routine baseline microbiological and physicochemi- cal analyses typically are performed. Should the results of these analyses indicate less than desirable site conditions, additional evaluations may be performed to determine which, if any, contributing factor is responsible (i.e., pH, temperature). Listed below are important parame- ters to be considered when making biofeasibility determinations: i Biofeasibility Investigation Parameters 0 Contaminant typelconcentration 0 Site Lithologyl hydrogeology 0 Available space 0 Condition and proximity to 0 Local economics groundwater 0 Cleanup criteria 0 Time restrictions/requirements 0 Physicochemical environment 0 Regulatory position (limiting factors) ;I it 6