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APPLICATION OF ALUM TO IMPROVE POST-DREDGING WATER QUALITY AT THE ASHLAND/NSP SUPERFUND SITE PILOT PROJECT
Garbaciak Jr., S., R. Onderko, D. Roznowski, S. Kozicki, M. Ciardelli, R. Brillhart, J. Morris, et al.
Dredging Summit & Expo '18 Proceedings, paper and 33 slides, 2018

The Ashland/NSP Superfund Site, located on the shore of Lake Superior's Chequamegon Bay, is the site of a former manufactured gas plant placed on the National Priorities List in 2002. EPA's 2009 ROD presented an Alternative Remedy to allow the entire site to have a full wet-dredge remedy if the wet-dredge pilot study to remove contaminated sediment using mechanical and/or hydraulic dredging equipment proved effective. The 2016 pilot study utilized a complex and innovative water quality barrier system comprising a breakwater and a series of carbon adsorption, full-depth, and bed-load baffle curtains to manage suspended solids and associated contaminant transport. A vital component of the pilot was to demonstrate that water quality standards were being met in time to allow demobilization of the barrier system before ice cover onset. To demobilize the barrier system, COC concentrations within the dredged area had to be below project-specific turbidity levels and State of Wisconsin surface water concentrations for PAHs. The project team determined that alum (aluminum sulfate) was able to reduce turbidity and decrease COC concentrations in an accelerated approach. This paper shares the results of bench-scale tests, column settling, and the field implementation of the selected plan.
Paper: https://www.westerndredging.org/phocadownload/2018_Norfolk/Proceedings/2b-2.pdf
Slides: https://www.westerndredging.org/phocadownload/2018_Norfolk/Presentations/2B_2.pdf



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