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Mr. Bob Marty <br /> Advanced GeoEnvironmerrtal (North) <br /> GLDM <br /> September 27, 1995 <br />' Page 2 <br /> ICOMWNT <br /> Slight improvement in oxidized nitrogen levels have appeared to have little effect on continued <br /> Igrowth of general and selective microbiological subpopulations and, in fact, such populations <br /> have further diminished since the previous sampling event. Although analytical data for this site <br /> have not been reviewed, it is very likely that the trend of diminishing microbial numbers over <br /> the past several sampling events may reflect a reduction of utilizable carbon substrate (both <br /> represented by target contaminant and/or alternative materials below the threshold limits of the <br /> microbes. Analytical data should be reviewed in order to evaluate this hypothesis. It should be <br /> noted that phosphate levels for both samples (especially MW-14) are extremely low and may be <br /> insufficient to support microbial growth, further contributing to the observed ND levels for both <br /> heterotrophs and selective degraders. <br /> Should you have any questions concerning this information, please do not hesitate to contact me. <br /> AKK:ch <br /> I <br /> tA <br /> I <br /> I <br />