25E - AGMT - CONSTRUCTION MGMT SRVS

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A. Construction and phasing The existing bridge consists of two separate structures: a north structure and a south structure that were built at different times. It is crucial for f=irst Street to remain operational during construction, so one through-lane in each direction will remain open during construction. In addition to the bridge structure, the project will be completed with the changing of the roadway approaches to meet the alignment of the new bridge. Construction of the new bridge will occur in two phases starting with the north structure. Work of this project consists of: Phase 1: North Structure Phase 1 begins with redirecting all traffic onto the existing south structure, one lane in each direction. Demolition Demolition of portions of the north structure to include superstructure and foundation, such as columns, wall piers, footings, and pile caps. The piles and drilled shafts of the existing bridge structure will be cut off one foot below the channel invert. Construction Construction includes the placement of the new bridge foundation elements during dry season as well as upper portions of the bridge superstructure, such as girders and deck. Placement of the superstructure of the bridge is not required to be conducted within the dry season. A new retaining wall will be built in the northeast quadrant of the bridge. Phase 2 :South Structure After completion of the new portion of the bridge, traffic will be routed onto it, and the south portion will be demolished. Demolition The Phase 2 demolition encompasses the same demolition activities as Phase 1, but they will occur on the existing south bridge structure. Construction Phase 2 construction will encompass activities similar to Phase 1 but on the south portion of the bridge. Also, a new retaining wall will be built in the southwest quadrant of the bridge. 3 25E-24