SAM #W912WJ27BA003

Maintenance dredging at Isle au Haut Thoroughfare, Maine

The U.S. Army Corps of Engineers, New England District, is seeking maintenance dredging at the Isle au Haut Thoroughfare Federal Navigation Project in Maine. - Buyer: U.S. Army Corps of Engineers (USACE), New England District; no further sub-agency or office is identified. - Requested service: Mechanically dredge approximately 3,355 cubic yards of shoaled material from the project’s 1,200-foot channel between Isle au Haut and Kimball Island. - Material includes highly compacted coarse sand and gravel, areas of cobbles, and isolated small boulders. - Dredging must reach the authorized depth, including approved advance maintenance and allowable overdepth, and the material must be placed at the Flake Island Disposal Site. - The mechanical dredge must be capable of excavating the compacted material. - Notable requirements: The anticipated seasonal work window is intended to avoid impacts to shellfish spawning, benthic resources, Essential Fish Habitat, protected species, and mobile fishing gear. - OEMs and vendors: None are named in the available information.

Description

The Isle au Haut Thoroughfare Federal Navigation Project, located between Isle au Haut, Maine and Kimball Island, Maine on the outskirts of Penobscot Bay, about six miles southeast of Stonington and 25 miles east of Rockland. The Federal Navigation Project consists of a -6-foot Mean Lower Low Water (MLLW) deep by 75-foot wide extending 1,200-foot in length through the shoal in the thoroughfare.The proposed work consists of mechanically dredging approximately 3,355 cubic yards (cy) (1,183 cy required, plus 2,172 cy overdepth) of shoaled material consisting of highly compacted coarse sand and gravel, with areas of cobbles and isolated small boulders from the channel. Due to the material type, a mechanical dredge with the ability to dig highly compacted coarse sand and gravel will be required. The proposed action is to dredge to the authorized depth of -6-foot MLLW plus an additional 1-foot of required advance maintenance with an additional allowable 1-foot of overdepth (e.g. -7-foot MLLW required + 1-foot allowable OD). One-time, advanced maintenance is approved for the entirety of the 1200-foot long authorized channel. The dredged material will be placed at the Flake Island Disposal Site (FIDS) which is approximately 1 nautical mile northwest of the FNP. Placement of the dredged material (sand, gravel and cobble) at Flake Island Disposal Site will benefit both juvenile lobster habitat and juvenile cod by increasing the areas habitat complexity.The anticipated allowable dredging window is between September 15 and April 1 to avoid impacts to spawning shellfish, benthic resources, Essential Fish Habitat (EFH) of federally managed species, threatened and endangered species and interactions with mobile fishing gear. Additional Links:Department of Defense Procurement ToolboxPIEE Solicitation Module Link for W912WJ27BA003Registration Instructions for the PIEE Solicitation ModuleWeb Based Training for the PIEE Solicitation Module

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