A Site-Specific Approach for the Evaluation of Natural Attenuation at Metals-Impacted Sites |
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| Authors: | Warren D. Brady Matthew J. Eick Paul R. Grossl Patrick V. Brady |
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| Affiliation: | 1. GeoSyntec Consultants, 4207 Rhoda Drive, Baton Rouge, LA 70816, Tel: 225-612-2542, Fax: 225-293-0196, E-mail: wbrady@geosyntec.com;2. Virginia Polytechnic Institute and Univ., 236 Smyth Hall, Blacksburg, VA 24061-0404, Tel: 540-231-8943, Fax: 540-231-3431, E-mail: eick@vt.edu;3. Utah State University, 4820 Old Main Hill, Logan, UT 84322-4820, Tel: 435-797-0411, Fax: 435-797-3376, E-mail: grossl@cc.usu.edu;4. Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185–0750, Tel: 505-844-7146, Fax: 505-844-7354, E-mail: pvbrady@sandia.gov |
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| Abstract: | Consideration of monitored natural attenuation (MNA) as a remedy component for metals-contaminated sites can be achieved using a site-specific screening approach, followed by application of one or a series of sequential extraction measurements. Hazardous waste sites contaminated with metals can be screened for the implementation of monitored natural attenuation on the basis of contaminant-specific soil chemical characteristics (i.e., Kd's, solubilities, and nonexchangeable sorbed fraction). Field cases are used to demonstrate the screening approach and to outline the primary considerations involved in accurately applying sequential extraction procedures to support the of MNA for site remediation. The results of these case studies provide strong evidence that site-specific screening and the use of sequential extraction procedures are effective methods for evaluating natural attenuation for metals impacted sites. |
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| Keywords: | natural attenuation metals sequential extraction bioavailability. |
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