Herbicide-Impacted Sediment Remediation. II: Field Operations and Optimization
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 20, Issue 2
Abstract
This paper is the second in a series on the Tyco Fire Products LP Sediment Removal Project, Marinette, Wisconsin, describing the dredging, stabilization and solidification (S/S) treatment, and nonhazardous disposal of arsenic (As)–impacted sediments. The high spatial variability of the As effects drove the need to develop a screening program to assess the environmental quality of sediments in scows within their 6-h decanting period before off-loading for purposes of reagent dose optimization, versus a default dose of 25% by weight ferric sulfate (60% aqueous) plus 10% by weight portland cement (). Portable X-ray fluorescence (XRF) and 3-h mini–toxicity characteristic leaching procedure (TCLP) techniques calibrated to wet sediments (plus moisture content) were shown to be a quick, reliable means of assessing sediment quality (10 samples per scow) to enable reagent dose optimization on a scow-by-scow basis. The maximum measured XRF As and TCLP As values were and , respectively, well above the sediment surrogates tested in the S/S treatability study. For 330 dredged scows (198 S/S-treatment bins) during the 2013 season (May 5 to November 23) processed at a typical daily rate of , only four bins required retreatment, for an overall 2% failure rate on bins processed. In total, 348,000 t of S/S-treated sediments were transported to nonhazardous landfill.
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Acknowledgments
CH2MHILL (Jeff Danko, Project Manager) completed this work for Tyco International, Inc., (Princeton, New Jersey) under the direction and management of Messrs. Joseph Janeczek, PE, and Larry Wilson, with regulatory oversight provided by U.S. EPA Region V and the Wisconsin Department of Natural Resources (WDNR). Sevenson Environmental Services (Niagara Falls, New York) was the general contractor responsible for all dredging and sediment treatment activities. All S/S mix design work and the development of the rapid XRF and mini-TCLP approaches were completed by CH2M HILL’s Applied Sciences Laboratory (Corvallis, Oregon). All field screening and compliance testing was completed on-site by ECCS Nationwide Mobile Laboratories (Madison, Wisconsin). Opinions, findings, and conclusions expressed in this publication are those of the authors and do not necessarily reflect the views of Tyco, CH2M HILL, ECCS, U.S. EPA, or WDNR.
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© 2015 American Society of Civil Engineers.
History
Received: Nov 16, 2014
Accepted: Jul 9, 2015
Published online: Sep 25, 2015
Discussion open until: Feb 25, 2016
Published in print: Apr 1, 2016
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