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,meq Y .1 <br /> Mr. Kevin McKibben <br /> Advanced Geo Environmental (North) <br /> GLDM <br /> March 31 , 1997 <br /> Page 2 <br /> COMMENT <br /> Physicochemical parameter levels remain relatively low, but would be generally considered as <br /> sufficient to support microbial growth and metabolism for these environments. Some shifting <br /> in microbial population dynamics has occurred since the previous sampling event, with MW-14 <br /> showing increased levels of heterotrophic microbes, with decreases in gasoline-specific <br /> microbial subpopulations observed for both samples. These data suggest a continuing decline <br /> in the dominance of the petroleum hydrocarbon concentration as a metabolically utilizable <br /> tsubstrate, especially for MW-14. The observed increase in the general population for this well <br /> suggests an increased abundance of other, noncontaminant available organics. Analytical data <br /> associated with these water samples should be reviewed in order to evaluate consistency with <br /> the interpretations noted above. <br /> Should you have any questions concerning this information, please do not hesitate to contact <br /> me. <br /> AKK:ch <br />