Z--JOHN DAY LOCK AND DAM POWERHOUSE MONOLITH JOINT AND WATERSTOP REPAIRS

The John Day Lock and Dam Powerhouse Monolith Joint and Waterstop Repairs project, managed by the Department of Defense under solicitation W9127N-14-R-0004, aims to significantly reduce water infiltration caused by failed monolith waterstops. The scope of work involves implementing various sealing methods, including pavement joint sealants and surface mounted rubber gasket waterstops, across the roadway deck, dam galleries, and the dewatered fishway. A critical component of the project is the time sensitive in-water work required between January 20, 2014, and February 28, 2014. The contractor is responsible for furnishing and installing all necessary materials, such as stainless and galvanized steel plates, anchors, rubber seals, foam backer rods, and chemical or urethane grout log waterstops. Additionally, the project requires the drilling of a vertical socket through the entire dam, with periodic monitoring to ensure the socket correctly straddles the joint. This comprehensive repair effort is categorized under NAICS code 237990 and is overseen by the W071 Endist Portland office.