Innovative Capping Procedures - Puget Sound Region (Concluded)

Pier 64 Capping Project

Location:

Seattle, WA

Completion Date:

3/94

Beneficial use of Corps maintenance dredge material for the City of

Comments:

Seattle. Seven-compartment barge used to sprinkle uniformly graded sand

(~0.4mm) dredged from upper Duwamish River Navigation Project. A

barge sand spreading system was used. Currents measured real time at

upper 1/3 and lower 1/3 depths.

Simpson Tacoma Kraft Co., Capping and Habitat Restoration Project

Location:

Tacoma, WA

Completion Date:

8/88

COE Permit action. Hydraulically dredged Puyallup River medium sand

Comments:

was used to cap contaminated in situ sediment at pulp mill outfall and

approximately 3,000 yd3 of contaminated excavation for outfall

extension. Spud barge with energy dissipator was used to spread sand.

West Waterway Prototype CAD Project

Location:

Seattle, WA

Completion Date:

3/88

Corps maintenance dredging. 1,100 yd3 bottom dumped into long pit,

Comments:

sprinkled from split-hull barge.

Chapter 5 Other Technologies Reviewed