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l <br /> , <br />' Advanced GeoEnvironmental, Inc <br /> Nomellini Construction Co <br />' November 3, 1999 <br /> Page 2 <br /> 1 <br />' COMMENT <br /> The data from these analyses indicate that concentrations of required bionutrients are generally <br />' below those which would be considered necessary to support microbiological growth and <br /> biodegradative activities This is especially evident for levels of both reduced and oxidized <br /> forms of nitrogen Although the pH of the tested waters is somewhat alkaline, it is likely that <br />' the low concentrations of bionutrients are responsible for the low general and selective <br /> microbial cell recoveries The inability to recover any biodegradative (contaminant-specific) <br /> microbes also suggests that the contamination may have been relatively recent and that <br />' insufficient time has passed in order to allow for development of a selective subpopulation <br /> It is likely that conditions would improve if appropriate nutrient supplementation were provided <br /> to these waters Based on the present data, natural bioattenuation of the contaminants <br /> lieappears not to be occurring at any appreciable level and is unlikely to occur in the future <br /> unless appropriate steps are taken to improve conditions to the levels necessary to support <br /> microbial growth and biodegradative activity <br />' Should you have any questions concerning these results, please do not hesitate to contact me <br />' AKK ch <br /> 1 <br /> 1 <br /> 1 <br /> `�1 +I <br />