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Kirtay, V., G. Rosen, M. Colvin, J. Guerrero, C. Katz, B. Chadwick, K. Fetters, V. Magar, et al.
ESTCP Project ER-201368, 2079 pp, 2017

The performance of enhanced monitored natural recovery (EMNR) as an innovative and cost-effective remedy for legacy sediment contaminants was evaluated under field conditions at the Quantico Marine Corps Base, Quantico, Virginia. The sediments contained DDX (i.e., the sum of the pesticide DDT and it derivatives DDD and DDE). The remedy involved the placement of a thin-layer cap (TLC, commonly <30 cm, also referred to as a "habitat enhancement cap") of clean sand to enhance natural recovery and reduce contaminant bioavailability to benthic organisms and subsequent potential threats to higher trophic levels. While clean sand was used at Quantico Site 99, the caps can include a broader range of clean material, such as clean dredged sediment that meets the chemical criteria for reuse. This demonstration was designed to evaluate the performance and effectiveness of the Quantico EMNR remedy and the utility of available monitoring tools to address EMNR performance, short-term implementation success, projection of long-term remedy success, and understanding of the mechanisms and processes that regulate EMNR effectiveness. Overall performance objectives for cap placement and stability were met. https://www.serdp-estcp.org/content/download/46426/432267/file/ER-201368%20Final%20Report.pdf

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