Market Research and Sources Sought Notice - dredging for the Mobile District U.S. Army Corps of Engineers’ Mobile Harbor Deepening project in Mobile, AL.

Phase 1 will consist of the Mobile Bar Entrance Channel and will require a trailing suction hopper dredge with a minimum hopper capacity of 3,600 cubic yards or an ocean certified hydraulic cutterhead dredge. The Corps estimates approximately 2.6M cubic yards of material which is comprised of clays, clayey sands, and silty sands. Disposal will be into the Sand Island Beneficial Use Area (SIBUA) and/or the Ocean Dredged Material Disposal Site (ODMDS). Phase 2 will consist of widening a portion of the Mobile Lower Bay Channel and remainder of the Mobile Bar Channel. The requirement will be for a trailing suction hopper dredge with a minimum hopper capacity of 3,600 cubic yards. The Corps estimates approximately 6.1M cubic yards. Material in the southern portion of Phase 2 will be similar to Phase 1; the remaining material is very soft to soft fine grained silts and clays. Disposal will be into the SIBUA and the ODMDS. Phases 3 and 4 will consist of the Mobile Bay Channel and will require a trailing suction hopper dredge with a minimum hopper capacity of 3,600 cubic yards or a mechanical dredge capable of dredging to a depth of 54 feet. The Corps estimates 6.1M and 6.0M cubic yards for Phases 3 and 4 respectively. Material is predominately very soft to soft fat clays and silts with some shell and clayey sands. Disposal will be into the ODMDS. Phase 5 will consist of the Mobile Bay and River Channels. The requirement will be for a hydraulic cutterhead dredge with minimum pump discharge diameter of 24 inches capable of dredging to a depth of 54 feet. The Corps estimates 4.6M cubic yards of material which is poorly graded fine to coarse sands with varying amounts of silts and clays. Disposal will be into open water sites adjacent to the channel. Disposal in the open water sites shall not exceed a lift tolerance of 3 feet upon placement. Pipeline lengths are expect to be between 35,000-70,000 feet and will require the use of booster (auxiliary) pumps. Phase 6 will consist of the Upper Mobile Bay Turning Basin and will require a mechanical or hydraulic cutterhead dredge capable of dredging to a depth of 54 feet. The Corps estimates 2.1M cubic yards of material which is predominantly sandy/coarse grained material. Disposal will require scow offloading into an upland placement site and/or the SIBUA. All the above requirements must be complete with crew, management staff, and support equipment including pipelines, booster pumps, tugs, and various other floating plants as would normally be expected to support a large dredging operation.

Division 35 -

Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Dredging.