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RIVER RAISIN AREA OF CONCERN: NAPL AREA REMEDIATION
Roberts, M., A. Corbin, P. Doody, T. Peters, and C. Robinson.
Proceedings of the Western Dredging Association (WEDA) Dredging Summit & Expo '17, Vancouver, British Columbia, Canada, June 26-29, 2017. p 447-461 + 23 slides, 2017

The NAPL Area is defined as the portion of the River Raisin AOC that contains an apparent NAPL substance and concentrations of PCBs >50 ppm. Remediation activities performed in 2016-2017 within the NAPL Area consisted of dredging sediment containing PCBs to specified depths, followed by placement of cover material in the nearshore area or an engineered cap in other dredged areas. To sequester PCBs remaining in deeper subgrade materials in the NAPL Area, two types of multi-layered engineered caps (A and B) were placed on the post-dredge surface within the navigation channel and transition areas. The difference between Cap A and Cap B was the size of armor stone needed to protect the chemical containment layer. The cap profile consisted of a chemical layer (sand/organoclay mixture) to contain potential PCB transport from underlying materials, overlain by a gravel filter layer, and followed by the armor stone layer. The single chemical containment layer, 12 in deep, comprised 3% minimum organoclay mixed with sand. Decontamination and demobilization of materials and equipment commenced upon completion of dredging and capping.
Paper: https://www.westerndredging.org/phocadownload/2017_Vancouver/Proceedings/7a_2.pdf
Slides: https://www.westerndredging.org/index.php/information/category/281-session-7a-sediment-remediation?download=1505:7a-2-river-raisin-area-of-concern-napl-area-sediment-remediation



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