Lower Duwamish Waterway Upper Reach Sediment CleanupWhat to expect during the week of February 3 Cleanup activities will occur in Sediment Management Areas (SMAs) 6, 8, 11B, and C1. The Contractor will dredge in an area of SMA 6 where testing showed that some contamination was missed. The Contractor will begin backfilling (placing clean material) in other areas of SMA 6, where dredging of contaminated material has been completed. The Contractor will place clean material in SMAs 8, 11B, and C1 where Enhanced Natural Recovery is the cleanup method. Enhanced Natural Recovery uses a thin layer of clean sandy material to speed up the natural recovery process. The final surveys of dredged and backfilled SMAs, 2, 3, and 4 will be evaluated for completeness. See the map of cleanup areas linked below. What to expect during the week of February 10 During the week of February 10, cleanup activities will continue in SMA 6. To complete this last area, the work will continue through February 28.
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