Seattle District > Missions > Civil Works > Dredging. An extensive analytical, public process was used to define open- water sites for dredged material disposal, and to define the guidelines for dredged material that can be disposed at these sites. There are two types of sites: dispersive and non- dispersive. Dredged material placed at non- dispersive sites remains on- site and is the subject of long- term monitoring. Dredged material placed at dispersive sites- -which are located in areas with strong tidal currents- -disperses quickly. No adverse effects are allowed at dispersive sites, so dredged material must meet more stringent evaluation guidelines to be eligible for disposal at these sites. There are eight dredged material disposal sites around Puget Sound (three dispersive and five non- dispersive) and two dispersive estuarine sites each in Grays Harbor and Willapa Bay. A STICK IN THE MUD: U.S. COAST GUARD, SLIP 36 DREDGING AND REBUILD, SEATTLE, WASHINGTON P. Stirling2 ABSTRACT A construction project on the Seattle Washington waterfront during the fall 2004 dredging season. Dredging is an excavation activity usually carried out underwater, in shallow seas or freshwater areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often. Quality Assurance Project Plan Effects of Small-Scale Gold Dredging on Metals Concentrations in the Similkameen River by Art Johnson Washington State Department of Ecology Environmental Assessment Program Olympia, Washington. East Waterway Maintenance Dredging Program. Environmental Checklist East Waterway Maintenance Dredging Program. The East Waterway Maintenance Dredging Program is located in the EW of the LDW and part of Elliott Bay. Island County Shoreline Program Approved. Flagship Management is working with a number of leading international marine and dredging organizations and require the. As part of a review process by the Washington State. The DMMP agencies collectively evaluate the suitability of dredged material for disposal at these sites. As owner of the state's aquatic lands, DNR manages the disposal sites and is responsible for environmental monitoring of all nondispersive disposal sites.
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