As-Needed Sediment Sampling, Characterization and Disposal Consultation Services

Client: City and County of San Francisco (City) Department of Public Works (SF DPW), Bureau of Construction Management Site Assessment and Remediation Division

Prime Contractor: Science Applications International Corporation (SAIC)

Location: San Francisco Marina West Basin and Entrance Channel

Scope of Services: Provide as-needed consultation services to SF DPW for sediment characterization monitoring programs to support maintenance dredging and new construction dredging along the City's Bay front, inland lakes and reservoirs. Responsibilities include the following: Review and comment on existing reports; Provide expert commentary; Provide environmental regulatory plans and documentation; Prepare sampling and analysis plans in accordance with applicable Federal, State, Regional, and local statutes, regulations and ordinances, planning and permitting of dredging and disposal activities; Perform collection, analyses, and evaluation of resultant data pertaining to sediments, soils, water quality in marine, freshwater, land, and wetland environments and ecosystems.

Pier 35 Vibracore Sediment Sampling: Pier 35 is located on the eastern shoreline of the city of San Francisco and is currently used as the primary berth for cruise ships. SAIC/ADH assisted the Port of San Francisco by performing maintenance dredging to a permitted depth of -35 feet MLLW, +2 feet overdepth. Previous sediment characterizations at Berth 35 found that the sediments posed no environmental risk and were designated as suitable for unconfined aquatic disposal (SUAD) in San Francisco Bay. To characterize these sediments for disposal options, seven sediment vibracore composite samples were collected from a dredge area adjacent to Pier 35.

Tasks: ADH participated in and/or was responsible for the following:

• Sediment vibracore sampling:
• • Ensured accurate positioning at sample locations, accurate target core lengths relative to actual mudline elevations, and ship-board duties for proper sample handling procedures.
• Generation of lithologic coring logs.
• Generation of samples to be analyzed for grain size and sediment chemistry analyses, and toxicity testing.
• Pipe dredge sampling at Alcatraz Island and San Pablo Bay reference sites.