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Understanding of the Project Technical Understanding The First Street Bridge Replacement Project over the Santa Ana River will include the removal and replacement of the two existing structures (north and south structures). It is crucial to maintain one through- lane in each direction during the construction of the First Street Bridge. -The project is to be completed in three stages, including the demolition of the north structure. The construction management team forthis work shall provide a resident engineer/construction manager and all support staff, which shall include office management and labor compliance, project control and scheduling analysis, structures inspection, water line relocation inspection, and roadway construction inspection, including irrigation and planting. Stage 7 Construction Stage 1 construction shall include the following construction activities: • Redirect all traffic onto the existing south structure, one lane in each direction • Remove existing signs and post at First Street • Remove existing conflicting striping • Install temporary K-rail per Caltrans standards • Install new signs per plan • Install temporary striping per plan • Start street improvements on the north side • Demolish the existing north structure, including superstructure and substructure. Existing piles shall be cut off one foot below the channel invert. • Construct the new structure (foundation work shall take place during the dry season, April 30 to October 1) • Construct the retaining wall at the northeast quadrant ;i OEVELOPEO ELEVATION First Street Elevation First Street Stage 1 Bridge Construction Cross Section h11LL City of Santa Ana I Public Works Agency Page 14 First Street Bridge Replacement I Construction Management First Street Typical Section Diagram