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Oregon Department of Environmental Quality (DEQ), 151 pp, 2017

This report documents the application of activated carbon (AC) products in the Lower Columbia Slough for a pilot study initiated in 2016 within the Slough waterway adjacent to the Pacific Meats Cleanup Site. Two forms of commercially available AC sediment amendments—Sedimite™ and AquaGate+PAC™—were installed to reduce bioavailability of elevated levels of PCBs in sediments. Shallow sediment sample PCB concentrations ranged from 69 µg/kg to 2,040 µg/kg, and deep sample PCB concentrations ranged from nondetect to 2,450 µg/kg. This report provides an assessment of delivery methods for applying AC to the target sediments; application of AC to the designated study area; and documentation of the implementability and costs of the AC amendment application methods and products. Future monitoring results will illuminate amendment effectiveness in reducing pore water concentrations of PCBs in the biologically active zone. http://www.oregon.gov/deq/FilterDocs/PilotImpReport.pdf

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