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DEMONSTRATION AND VALIDATION OF ENHANCED MONITORED NATURAL RECOVERY AT DOD SITES: ESTCP COST AND PERFORMANCE REPORT
Kirtay, V., G. Rosen, M. Colvin, J. Guerrero, C. Katz, B. Chadwick, K. Fetters, V. Magar, et al.
ESTCP Project ER-201368, 71 pp, 2018

Enhanced monitored natural recovery (EMNR) involves the placement of a thin layer (commonly < 30 cm) of clean sand or clean sediment over contaminated sediment, coupled with ongoing natural recovery processes and a monitoring program to achieve ecological recovery and risk reduction at contaminated sediment sites. In some cases, dredged sediment may be preferable to quarried sand because it has natural organic matter to support benthic life. In general, thin-layer capping (TLC) is not designed to provide complete chemical isolation but to provide a reasonable degree of physical isolation and reduction toward lower chemical concentrations targeting site-specific remedial action objectives and goals. EMNR also reduces potential resuspension or transport of contaminated sediment particles. The demonstration was implemented at Site 99, the Quantico Embayment site, Quantico, Virginia. TLC grain sizes were selected in the final design to be stable during both normal river flows and during periods of flood flows and storm-generated waves. For the Quantico Embayment site, the clean sand EMNR remedy was shown to be effective in reducing exposure in surface sediments as measured by bulk sediment total DDX concentrations, porewater DDX concentrations, and direct measurement of bioaccumulation in two site-exposed benthic organisms. https://www.serdp-estcp.org/content/download/47277/451061/file/ER-201368%20Cost%20&%20Performance%20Report.pdf



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