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�s <br /> Mr. Kevin McKibben <br /> Advanced GeoEnvironmental (North) <br /> GLDM <br /> July 1, 1997 <br /> Page 2 <br /> COMMENT <br /> Please note that microbial concentrations associated with these samples, in general, are below <br /> those considered acceptable for active, ongoing biodegradation of contaminant. Aside from <br /> associated relatively low levels of available nitrogen and marginal hydration percentages, there <br /> may additionally be some biotoxicity associated with localized high levels of hydrocarbon. <br /> Though there has been approximately eight months since the previous soil analyses for this <br /> site, only minor physicochemical and microbiological changes have occurred, and there is no <br /> indication of significant levels of microbial-based biodegradation of contaminants. Under such <br /> . circumstances, there is little evidence to support a belief that natural bioattenuation of <br /> contaminants will occur at appreciable levels. You may wish to consider addressing the soils <br /> contamination with a somewhat more aggressive bioremedial approach, as the addition of <br /> selected nutrients, as well as improved hydration will be required for appropriate metabolic <br /> activity. Enhanced activity, in addition, will likely be achieved through the addition of <br /> subsurface oxygen, either via air injection and/or hydrogen peroxide, in conjunction with <br /> nutrient and water supplementation. <br /> Should you have any questions concerning this information, please do not hesitate to contact <br /> me. <br /> AKK:ch <br />