| 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). |
| Genre: | Conference Paper |
| ProdID: | 70028034 |
| Citation Author: | Mendez, E.; Widdowson, M.; Chapelle, F.; Casey, C. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes; 2005; Conference Paper; Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium; Mendez, E.; Widdowson, M.; Chapelle, F.; Casey, C. |
| Citation Start Page: | 1213 |
| Citation Volume: | 3 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes; 2005; Conference Paper; Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium; Mendez, E.; Widdowson, M.; Chapelle, F.; Casey, C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
| Publisher: | |
