Baldhill Dam Ogee Spillway Concrete Repair Project

Remove all delaminated and unsound concrete, to a removal depth of sound concrete, along the downstream ogee spillway surfaces of gate bay(s) 1, 2, and 3. By methods of chemical grouting, eliminate all paths of water penetration into the structural concrete matrix. Water appears to be leaking through the exposed horizontal construction joints along the upstream vertical face and is existing to the downstream concrete ogee surface. Underwater chemical grouting will be required by an experienced dive team. The Contractor will be required to submit a diving safety plan for approval, including certifications for all divers. Divers will be required to seal the exterior vertical surface of each horizontal joint. A bituminous soaked oakum rope will be tightly packed into the horizontal joints to prevent any leakage of the chemical grout. Divers will also be used to drill and inject the chemical grout into the horizontal joints along the upstream piers. The contractor will be required to safely mix and inject the chemical grout into the concrete spillway structure in accordance with the manufacturer's recommendations and specified requirements.

Dam/Tunnel, Renovation.

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.