~ The bridge deck will require a lot of cleaning before the concrete overlay is placed. The contractor is considering various cleaning options and methods.
~ There was some discussion on the appropriate superstructure type for this location, and the consensus was a girder bridge with a cast-in-place deck. Future design-build scopes of work will preclude short span bridges of this length.
~ There was discussion on the clearing and grubbing operations, which left a significant amount of chainsaw cut and mechanized clearing debris accumulated against the natural vegetation line on the downstream side.
~ The bridge had a 0.3% tangent grade, which is not very efficient for drainage on a long bridge. The Bridge Maintenance Unit suggested requiring vertical curves on long bridges to improve drainage efficiency.
A/I ~ For future projects, the Construction Unit will review the contract language for removal of woody vegetation.
A/I ~ The Roadway and Hydraulics Units will consider 0.5% for the minimum grade, and vertical curves on long structures to facilitate drainage.
