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Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes

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Abstract

Natural Attenuation Software (NAS) is a screening tool to estimate remediation timeframes for monitored natural attenuation (MNA) and to assist in decision-making on the level of source zone treatment in conjunction with MNA using site-specific remediation objectives. Natural attenuation processes that NAS models include are advection, dispersion, sorption, non-aqueous phase liquid (NAPL) dissolution, and biodegradation of either petroleum hydrocarbons or chlorinated ethylenes. Newly-implemented enhancements to NAS designed to maximize the utility of NAS for site managers were observed. NAS has expanded source contaminant specification options to include chlorinated ethanes and chlorinated methanes, and to allow for the analysis of any other user-defined contaminants that may be subject to microbially-mediated transformations (heavy metals, radioisotopes, etc.). Included is the capability to model co-mingled plumes, with constituents from multiple contaminant categories. To enable comparison of remediation timeframe estimates between MNA and specific engineered remedial actions , NAS was modified to incorporate an estimation technique for timeframes associated with pump-and-treat remediation technology for comparison to MNA. This is an abstract of a paper presented at the 8th International In Situ and On-Site Bioremediation Symposium (Baltimore, MD 6/6-9/2005).

Suggested Citation

Mendez, E., Widdowson, M., Chapelle, F., and Casey, C., 2005, Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes, in Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium, v. 3, Baltimore, MD, 6 June 2005 through 9 June 2005.

Publication type Conference Paper
Publication Subtype Conference Paper
Title Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes
ISBN 9781574771527
Volume 3
Year Published 2005
Language English
Larger Work Title Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium
First page 1213
Conference Title 8th International In Situ and On-Site Bioremediation Symposium
Conference Location Baltimore, MD
Conference Date 6 June 2005 through 9 June 2005
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