Laserfiche WebLink
Advanced GeoEnvironmental, Inc. <br /> Chapin Brothers <br /> January 14, 1999 <br /> Page 2 <br /> COMMENT <br /> Physicochemical properties, at present, generally appear to be within the normal range of <br /> — values supportive of microbial growth and metabolism for the water samples tested; however, <br /> low phosphate values associated with sample MW-4 should be checked periodically to ensure <br /> the level does not drop to below 0.5 ppm (threshold limit). In general, microbial population <br /> _ numbers are average to slightly below average for all wells, with recoverable selective <br /> (contaminant-specific) microbes encountered for samples MW-4 and VE-6 only. A review of <br /> the Chain-of-Custody indicates that contaminant content associated for sample MW-3 is only <br /> _ approximately 4000 ppb (= 4 ppm), a concentration of insufficient magnitude (with respect <br /> to other possibly available organics) to support the development of a significant population of <br /> target-specific degraders, particularly within a short time period. Overall, the data suggest that <br /> a natural bioattenuation of gasoline over time within at least two of the wells will likely occur, <br /> so long as sufficient inorganic components are available (quarterly monitoring of these <br /> components is recommended). It is unlikely however, that demonstrable bioattenuation will <br /> occur within the waters associated with sample MW-3. <br /> Should you have any questions concerning these results, please do not hesitate to contact me. <br /> AKK:ch <br /> r • <br />