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A CASE STUDY ON ADAPTIVE MANAGEMENT AND THE OPTIMIZATION OF A PILOT BANK STABILIZATION REMEDY FOR A MERCURY-IMPACTED RIVER
Collins, J., C. Dixon, M.R. Liberati, and N.R. Grosso.
The 39th Annual North American SETAC Meeting in Sacramento, November 4-8, 2018

Introduction of legacy Hg impacted soils to State of Virginia's South River through bank erosion is the highest source of Hg loading to the system. In 2009, a bank stabilization pilot was constructed along a 500-ft reach of the river to assess whether control of Hg loading to the water column and sediment through eroding banks could reduce Hg concentrations in the aquatic environment. The design to abate localized bank erosion incorporated three main components: (1) a rock toe at the base of the bank for slope protection; (2) soil lifts to engineer a more stable and gradually sloping bank; and (3) native vegetation planted on both the slope and top of the bank to provide further stability and habitat. Monitoring results since installation showed significant reduction in near-bank sediment and pore water Hg concentrations within 3-5 yrs. See additional information about this project at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4321986/ and also a poster at http://southriverscienceteam.org/news/documents/Posters/AOC%204_STM_Poster_Battelle_2017.pdf.



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