Lewisville Dam Safety Modification (LDSM) Spillway

The scope of the project includes all work required for construction to make necessary repairs to Lewisville Dam, Lewisville, Texas. The measures to address the structural stability concerns associated with PFM 6 consist of posttensioned anchors installed through the ogee weir, and an upstream geomembrane blanket. An anchor field testing program to gather foundation information to verify the anchoring capacity assumptions of the Eagle Ford shale foundation is complete with the relevant data and reports included in the Design Documentation Report and Geotechnical Data Report. A work platform will be required to install the anchors along the downstream slope of the monoliths. Install 73 post-tensioned strand anchors on the spillway. The anchors will be founded approximately 130 feet below the spillway weir foundation. All anchors will be installed and tensioned before performing any demolition on apron slabs. Install permanent load cells on one anchor per monolith. Install cable through trench cut into weir to right abutment, up the abutment to a terminal box at the top of the abutment for monitoring. Test anchors as specified and per the PTI.

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.