"This presentation describes sediment remediation at the Bremerton Naval Complex (BNC) in Bremerton, Washington. Descriptions are given for state-of-the-art features including environmental clamshell buckets, dGPS guidance systems, precise dump barge positioning, extensive water quality monitoring, and removal of compressed gas cylinders with 72-inch diameter underwater magnet. Contaminated sediment was placed into a confined aquatic disposal pit (Pit CAD) 620 feet by 600 feet by 36 feet below the mudline. Project is permitted under a Corps of Engineers permit with a Biological Opinion from NMFS for protection of threatened Puget Sound Chinook salmon, and a Record of Decision for CERCLA remediation."
"The work was done with equipment that evolved from traditional clamshell dredging and bottom-dump barge placement. This results in cost-effective remediation for large volumes of non-hazardous sediment. The cost for dredging and disposal of 390,000 cy in the Pit CAD and 310,000 cy in open water is about 13 million U.S. dollars. Part 1 describes the remediation work performed from June 2000 through March 2001 with the planned final capping scheduled for 2001. Part 2 discuss how the successes of this project can be used to design future confined disposal facilities for contaminated sediment remediation."
excerpt from:
Confined Aquatic Disposal of Dredged Material at Bremerton Naval Complex 2001 International Containment & Remediation Technology Conference and Exhibition. June 10-13, 2001. Orlando, Florida.
Mark T. Otten, P.E.
Foster Wheeler Environmental Corporation
12100 NE 195th Street, Suite 20
Bothell, WA. 98011
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