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CONSTRUCTION REPORT: ENHANCED NATURAL RECOVERY/ACTIVATED CARBON PILOT STUDY, LOWER DUWAMISH WATERWAY
Lower Duwamish Waterway Group, 339 pp, 2018

The Lower Duwamish Waterway Group is conducting a field pilot study to evaluate the potential effectiveness of an innovative sediment technology in the Lower Duwamish Waterway (LDW). The study will determine whether enhanced natural recovery (ENR) material amended with granular activated carbon (AC) can be applied successfully to reduce the bioavailability of PCBs in remediating contaminated LDW sediments. The study compares the effectiveness of ENR with added AC (ENR+AC) versus ENR without added AC in three areas: the intertidal plot, subtidal plot, and scour plot. Each plot comprises two subplots, one with ENR alone, the other with ENR+AC. For the ENR portion of this project, a thin layer of clean material (sand or gravelly sand) was placed over subtidal and intertidal sediments. For the ENR+AC portion, a thin layer of clean material augmented with AC was placed over subtidal and intertidal sediments. The goal of the study is to evaluate the performance of ENR+AC compared to ENR in reducing PCBs bioavailability over a 3-yr monitoring period. https://www.ldwg.org/rifs_docs.htm#activated



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