RFI - Monongahela River, Lock and Dam 3 Decommissioning

The U.S. Army Corps of Engineers, Pittsburgh District, is seeking information to assist in creating contract documents to remove approximately 640 ft of the fixed crest dam at Monongahela (Mon) 3 while leaving 30 ft for stabilization of the left dam abutment. The driving factor behind the design is to open the new navigable channel after the breach in as quick of a timeframe as possible, minimizing the impact to navigation. The Mon 3 lock will remain open until the breach is blasted. Once the breach commences, navigation cannot be restored until a 300 ft wide opening to draft depth is created. The final debris removal outside the 300 ft channel may be completed after navigation is restored. The debris will be disposed of on site and a portion of it will be processed to create aggregate to fill the flume way and stabilization berms for long term stability of the upper guide wall, land wall, and dam abutment monoliths.

Dam/Tunnel, Demolition.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Dam Construction and Equipment.