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' Advanced GeoEnvironmental, Inc <br />' MBP-Lodi <br /> November 17, 1998 <br /> Page 2 <br /> COMMENT <br /> The samples submitted for analyses revealed no recoverable heterotrophic or selective <br /> microorganisms at the dilutions tested While bionutrient conditions are well within the range <br /> of support for microbial growth and metabolism, pH is relatively high, and may partially <br /> account for the paucity of microbial growth It should be noted however, that unless the high <br />' pH was due to a relatively recent event (such a a spill of caustic material), one would have <br /> expected a subpopulation of microbes to have developed over time which is reasonably well <br /> adapted to growth under moderately alakaline conditions These results suggest the possibility <br />' that some level of biotoxicity exists at the site, and efforts should be considered in order to <br /> further evaluate this possibility Such biotoxicity can be due to excessive levels of metals, <br /> salt, or other, as yet unidentified material Present microbiological and physicochemical <br />' conditions at the locations represented by the samples evaluated are not consistent with <br /> natural bioattenuation, and induced bioremediation should not be attempted unless and until <br /> the source of the apparent biotoxicity can be identified and mitigated <br /> NShould you have any questions concerning these results, please do not hesitate to contact me <br /> ' AKK ch <br /> • <br />