Environmental/Sediment Remediation

South Terminal Development Sediment Characterization

Port of Everett
Everett, Washington

Hart Crowser conducted sediment sampling and analysis near the Port of Everett's proposed South Terminal expansion. This work was done to seek ranking of the site under Puget Sound Dredged Disposal Analysis (PSDDA), and to collect geotechnical information for the project design.

 

Sitcum/Blair/Milwaukee Waterway Nearshore Fill

Port of Tacoma
Tacoma, Washington

The largest sediment remediation project ever undertaken by EPA mandate, this Superfund site project involved more than 2 million cubic yards of sediment. Hart Crowser conducted a feasibility study and provided geotechnical design of a nearshore fill for one million cubic yards of dredge spoils. The project involved designing a complex offshore exploration program to assess foundation conditions for a 60-foot-high impoundment dam. We determined the behavior of sediments placed in the impoundment and evaluated seismic hazards.

 

Middle Waterway Area C, Superfund Site Sediment Remediation and Tideflat Restoration

Washington State Department of Natural Resources
Tacoma, Washington

The project received a Bay Heroes Award from Citizens for a Healthy Bay. The work involved an innovative capping methodology using a pneumatic blower. Engineers also found an innovative method to work with mucky, quicksand-like sediment in this sensitive habitat environment.

 

Randle Reef Sediment Remedial Design

Hamilton Port Authority
Port of Hamilton, Ontario, Cananda

Hart Crowser staff have specialized experience in designing Containment Disposal Facilities (CDFs) and Engineered Containment Facilities (ECFs) for contaminated sediments. For this ECF project, we investigated dredging options, transportation alternatives, ECF designs, settling and consolidation of material within the ECF, and water quality issues.

 

Port Gamble Wood Waste Interim Action

Washington State Department of Natural Resources
Port Gamble, Washington

We worked with the Washington Departments of Natural Resources and Ecology, to clean up wood debris associated with historical milling operations in Port Gamble Bay.


 

Pier 25 CERCLA Sediment Remediation

Port of Tacoma
Hylebos Waterway, Tacoma, Washington

Hart Crowser conducted remedial investigations and a feasibility study at this former shipyard site. Challenges including taking samples on steep riprap slopes, and capping sediments on those steep slopes. We worked late night and early morning hours to coincide with low tides.