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I <br /> 1 <br />' Mr Tim Cuellar <br /> Advanced GeoEnviron mental (North) <br />' Cal Fuels <br /> July 3, 1997 <br /> Page 2 <br />' COMMENT <br />' Although nitrogen levels associated with the analyzed sample are moderately low and the pH <br /> is somewhat alkaline, these conditions would not be expected to yield such low numbers of <br /> viable microbial subpopulations Moisture content, as well as remaining physicochemical <br />' parameters are consistent with acceptable levels for active microbial growth and metabolic <br /> activity These results, especially those associated with an absence of viable heteotrophic <br /> cells, suggest that a degree of biotoxicity may be exerting an influence locally Such <br />' biotoxicity may be as a result of localized excessive concentrations of gasoline (due to its <br /> solvent-like nature) Alternatively, the presence of known biotoxins such as high <br /> concentrations of selected heavy metals should also be considered Given these results, it is <br /> unlikely that contaminated soils associated with the sample analyzed will undergo significant <br /> levels of bioattenuation You may wish to consider more aggressive remedial options such <br /> as enhanced bioremediation (analysis of biotoxic influences should be conducted) and/or vapor <br />' extraction for soils mitigation <br /> Should you have any questions concerning this information, please do not hesitate to contact <br />' me <br /> 1 <br /> 1 <br /> AKK ch <br /> 1 <br /> 1 <br />