St. Louis River AOC Azcon Slip Sediment Remediation

Provide all work, materials, equipment, labor, supervision, management, and administration to construct a remedial cap in Azcon/Duluth Seaway Port Authority (DSPA) slip in the Duluth-Superior harbor. This slip has areas with sediment concentrations for contaminants of concern above the respective clean up levels.Mobilizing to the site in Duluth-Superior Harbor, St. Louis, MN and install a silt curtain. Dredge slip with a mechanical plant and treat sediment in scows at the slip with 5% Portland cement, transport to Erie Pier for offload into trucks and dispose of at local landfill.  Place cap consisting of two layers, Layer A and Armor Stone. Layer A cap consists of dredged material from Duluth Anchorage Area navigation channel. Place Layer A cap and then place with Armor stone.  Ongoing surveys by the Government will be done after each construction feature is installed to Demobilize. Remedial footprint: 2.8