FY18 St. Louis River AOC Slip 3 and Slip C Remedial Cap

FY18 St. Louis River AOC Slip 3 and Slip C Remedial Cap

Provide all work, materials, equipment, labor, supervision, management, and administration to construct a remedial cap in two slips in the Duluth-Superior harbor. Both of these slips have areas with sediment concentrations for contaminants of concern above the respective clean up levels.

Slip 3 construction involves a limited amount of sediment leveling to reduce grade changes as well as dredging a 900 square foot area outside of the capping footprint and placing material in the deep portions of the capping area. Leveling activities will be followed by construction of a subaqueous cap over approximately 0.88 acres in the slip.

Slip C construction involves construction of a subaqueous cap over approximately 6 acres of the slip where sediment
concentrations for contaminants of concern are above the respective clean up levels.

Both subaqueous caps are comprised of two layers. Layer A consist of dredged material from the federal navigation channel. Layer B consist of 6-inch thickness of imported aggregate.

. Awarded Vendors: White Lake Dock & Dredge, Inc.. Contract Award Dollar Amount: $2,912,765.98. Contract Award Date: 2018-08-15.