The Army Corps of Engineers hired ICF to monitor water quality during maintenance dredging of the Duwamish River and Federal Navigation Channel of Grays Harbor navigation channel and turning basin in order to comply with water quality certification requirements for the project.
For the Duwamish River Project, ICF collected salinity, temperature, dissolved oxygen, and turbidity data during the first five days of the dredging project, analyzed the results, and provided daily and project reports. For the Grays Harbor Project, ICF conducted a supplemental monitoring study to determine the extent of turbidity during dredging throughout an extension of the in-water work window. The supplemental monitoring was used to determine the extent of the turbidity plume generated during dredging and the potential for turbidity to affect foraging success for bull trout in the estuary. Water quality data included temperature, conductivity, dissolved oxygen, turbidity, and pH. These parameters were determined at surface, mid-depth, and near bottom positions in the water column at background sites, point of compliance sites, and midway sites.
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