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CONCEPTUAL BASIS FOR NATURAL ATTENUATION (NA) AS REMEDIATION APPROACH
Citation:
WILSON, J. T. CONCEPTUAL BASIS FOR NATURAL ATTENUATION (NA) AS REMEDIATION APPROACH. Presented at Workshop for EPA of Taiwan on Natural Attenuation as Remediation for Contaminated Sites, Taipei, TAIWAN, October 26 - 27, 2006.
Impact/Purpose:
To inform the public.
Description:
As used in enforcement actions at hazardous waste sites by U.S. EPA, monitored natural attenuation is a remedy fully equivalent to any other remedy. The acceptance of MNA is based on three lines of evidence: historical ground water and/or soil chemistry data that demonstrates a trend of declining contaminant concentration, 2. hydrogeologic and geochemical data that demonstrate NA processes and rates, and 3. Field or microcosm studies. MNA is appropriate as remedial approach only where it can be demonstrated to achieve remedial objectives within reasonable time frame, and meets the applicable remedy selection criteria for the particular regulatory program.