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. Advanced GeoEnvironmental, Inc <br /> Sierra Lumber <br /> July 2, 1999 <br /> Page 2 <br /> COMMENLT <br /> Physicochemical values associated with the samples submitted for analyses are well within <br /> the range necessary for microbial growth and development Differential microbial analyses <br /> revealed average concentrations of general (heterotrophic) microorganisms for both samples <br /> While both samples yielded detectable levels of selective (contaminant-specific) microbes, the <br /> proportion of biodegraders was significantly lower for sample EW1-25 Such a result suggests <br /> that the contaminant-based carbon source has become limiting either because of very low <br />' absolute concentrations of the contaminant, and/or because of limited bioavailability Because <br /> of the physical nature of the contaminant however, the presence of contaminant at <br /> concentrations below the metabolic threshold of the microorganisms is more likely In such <br /> cases, alternative carbon sources (such as organic debris) which may be in the soil become <br /> the dominant food source for native microorganisms, hence the higher general count <br /> associated with this sample A 10% biodegrader concentration for sample MWS-25 suggests <br /> liethat microbial metabolism of the contaminant is occurring (via natural bioattenuation), and will <br /> likely continue to occur so long as the necessary bionutnents and physicochemical conditions <br /> remain adequate to support growth <br /> Should you have any questions concerning these results, please do not hesitate to contact me <br /> AKK ch <br /> I <br /> _IkS <br />