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Mr. Kevin McKibben Advanced Geo Environmental (North) GLDM June 26, 1997 Page 2 J COMMENT Some moderate changes were noted for physicochemical parameters this sampling round, most notably a reduction in pH by approximately 1 .0 unit for each well. Changes were noted for some bionutrients, as well, especially those associated with MW-9. In particular, phosphate exhaustion, as well as near nitrate- and potassium-exhaustion has occurred within these waters. In comparing nutrient utilization rates corresponding to these level changes for both wells, as well as associated microbiological population dynamics, it is clear that greater efficiency of microbial growth and contaminant metabolism has occurred within MW-9. Although absolute microbial numbers remain relatively low, a significantly greater proportion of contaminant degraders is observed for waters associated with MW-9. Such results may also suggest a higher residual concentration of contaminants within this well, as generally higher substrate concentration levels will yield more rapid microbial metabolic kinetics. A reduced level of contaminants likely exists for MW-14 since population dynamics are not consistent with focused and/or efficient contaminant utilization. A review of analytical data associated with these samples should be reviewed in order to evaluate consistency with the above interpretations. Efforts should be undertaken to replenish nutrients in MW-9 if a residual concentration of contaminants still remain. Should you have any questions concerning this information, please do not hesitate to contact me. AKK:ch i