Port of Long Beach Sediment Characterization

Prior to implementing Phase II of their Maintenance Dredge Program to restore the navigation channels and berth facilities to permitted depths, the Port of Long Beach contracted MBC to characterize the sediments at three different sites (two at Pier B and one at Pier F). At each site, a clamshell dredge was proposed to excavate sediment and place it in a scow for transport to the Middle Harbor Project area.

Prior to mechanical dredging, the Port was required to characterize physical and chemical parameters of the sediments at the proposed maintenance dredge sites. Sediment testing followed the recommendations of the Port’s Sediment Management Handbook for Dredge and Fill Projects. Sediments were collected at the three sites using a vibracore, with penetration ranging from <1 ft to >6 ft. Sediment was also collected from the LA-2 ocean disposal site for reference. Analyses included sediment testing, elutriate analysis, and solid phase toxicity. Results were summarized in a Sampling and Analysis Report, and presented to the Southern California Dredged Material Management Team.