20A - AA FIRST ST BRIDGE REPLACEMENT PROJECT

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LSA ASSOCIATES, INC. JULY 2010 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA Dry and Wet Season Activities All demolition activities and some construction activities will take place only in the dry season (April 15 to October 15 annually) due to seasonal constraints of working in the riverbed. Therefore, construction may take up to two dry seasons to complete the new bridge. Specific construction activities such as demolition of the piers, foundation elements, and upper parts of the bridge will be conducted only during the dry season. Construction activities that encompass replacement and reconstruction of the parts of the bridge above bridge elevation (placing girders, deck construction) may be conducted during the wet season because they will not take place in the riverbed. Bicycle Detour Plans The Santa Ana River Bicycle Trail will not close due to construction. However, detours will be necessary while construction takes place. The bicycle trail detour plans are described below and shown in Figures 14, 15 and 16. Phase 1: Bicycle Detour for Closure of the Trail Access Ramp on North Side of First Street. During Stage 1, when construction of the north side of the bridge occurs, the northside Bicycle Trail access on First Street will be temporarily closed. Therefore, cyclists on the Bicycle Trail exiting and traveling westerly on First Street will have to exit either at McFadden Avenue or Fifth Street, depending on whether they are traveling north or south on the Bicycle Trail. Cyclists exiting onto First Street and traveling easterly will still be able to do so by using the south side Bicycle Trail access. Cyclists wanting to enter the Bicycle Trail from the east will be routed along these same paths to gain access to the Bicycle Trail. Phase 2: Bicycle Detour for Closure of the Trail Access Ramp on South Side of First Street. During Stage 2, when construction of the south side of the bridge occurs, the south side Bicycle Trail access on First Street will be temporarily closed. Therefore, cyclists on the Bicycle Trail exiting and traveling eastbound on First Street will have to use the Fifth Street exit. Cyclists exiting onto First Street and traveling westbound will still be able to do so by using the northside Bicycle Trail access. Cyclists wanting to enter the Bicycle Trail from the west will be routed along these same paths to gain access to the Bicycle Trail. Detour For Overhead Construction Activities. The Bicycle Trail will remain open along the channel during both Phase 1 and Phase 2; however, certain construction activities which would pose a hazard to Bicycle Trail uses such as demolition of the existing bridge and erection of the precast girders for the new bridge will require a temporary detour of the Bicycle Trail. It is expected that each stage will require two separate detours for an estimated duration of one week each for these activities. During these activities, both northbound and southbound cyclists on the Bicycle Trail will have to exit prior to First Street at either McFadden Avenue (northbound) or Fifth Street (southbound) and then re-enter the Bicycle Trail at the next entrance (McFadden Avenue or Fifth Street). PADMJ0701\MND\2.0 Project Description.doc (07/25/10) 2-18 20A-29