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1 - <br />' Advanced GeoEnvironmental, Inc. <br /> Geweke <br /> March 11, 1998 <br /> Page 2 <br />' COMMENT <br /> The samples submitted for analyses revealed very low viable recoveries for heterotrophic and <br />' selective microorganisms at the dilutions tested. Sample P25-50 did not yield any viable cells. <br /> It should be noted however, that organisms which were recovered from the samples <br /> represented 100% contaminant biodegraders. In general, bionutrient conditions are well within <br />' the range of support for microbial growth and metabolism, except low moisture content is <br /> likely responsible for the paucity of growth associated with sample P25-50. These results <br /> suggest the possibility that some level of biotoxicity exists at the site, and efforts should be <br />' considered in order to further evaluate this possibility. Such biotoxicity can be due to <br /> excessive levels of metals, salt, or other, as yet unidentified material. Alternatively, carbon <br /> substrate (either contaminant-based or competitive forms) may be present at levels which are <br />' insufficient to support microbial growth and would thus help to explain the low growth values <br /> obtained. It is possible that both conditions may coexist. An evaluation of analytical <br /> chemistry associated with these samples (hydrocarbon levels 1 total carbon levels) would assist <br /> in reconciling these results. <br /> Should you have any questions concerning these results, please do not hesitate to contact me. <br />' AKK:ch <br /> I <br />