25B - SANTA ANA BLVD GRADE SEPARATION_Exhibit A-1_Color

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This superstructure alternative will require shoofly tracks, station modifications, and detoured traffic to isolate the bridge site completely for construction. This alternative proposes to construct a railroad bridge by lowering the Santa Ana Boulevard. A two -Span Structure Alternative would work very well at this location. This proposed double track railroad bridge structure is approximately 126.7 feet long and 40.3 feet wide, with no skew to Santa Ana Boulevard. A Pier Bent is needed in the median of Santa Ana Boulevard, which will result in the maximum span length of 63.3 feet, and therefore a SCRRA Standard Precast /Prestressed (PC /PS) Double Cell Box Girder Structure can be used for the structure type. Attention is directed to General Plan — PC /PS Con Box Alternative, Figure 5. A precast, simply supported structure is the preferred railroad bridge type because of its flexibility for repair and replacement in the future. Significant shoring would be required around the construction area when constructing the bridge. Retaining walls would be required for the roadway depression. In order to facilitate the traffic staging /handling during the construction, the walls constructed parallel to Santa Ana Boulevard could be constructed using "top- down" construction. Utility Relocations Always a significant concern on any grade separation due to the impact to existing facilities, AECOM takes a tried and trued approach to coordinating these efforts. This starts with our current relationships that we have developed on past projects with each of the utility companies, which allows us to understand each of their needs, to develop a strategy for their relocation, and to address impacts both during and after construction. The key is to be proactive, meeting early and often, and disseminating the project information to each utility company. AECOM will develop a conceptual relocation plan and refine this further with input from the utility companies. No one will know the impacts and obstructions to be encountered better than our designers, and it is up to us to convey this information to the utility companies. Our goal will be to provide a single relocation, when feasible, for each utility within the project site. We have effectively achieved this on past projects through the use of: Utility Corridors: Uti lize easements or acq u i red right -of- way outside the Santa Ana Blvd. footprint, combining with access roadways to better utilize space. The utility corridor allows for a single relocation of each utility, eliminating the need for temporary relocations, especially as the agency typically will bear the cost of one of these relocations. This will be the preferred method, especially with City owned land on the south side, as well as many utilities already located within the old Fruit Street right -of -way, outside of the grade separation improvements. Temporary Shutdowns: Early discussions with the utility companies, especially water and gas, might yield the fact that particular pipelines may be taken out of service during construction due to adequate redundancy in the system or the ability to backfeed the service to the end users. Construction Staging: Where a utility corridor is not feasible and services must remain in service, construction staging must account for both the existing and permanent location of the utilities to ensure continual service. With the staged construction approach on this project, this is a feasible approach, though it may require temporary relocations to clear the stage one construction. AECOM has significant experience in developing utility relocation plans for grade separations D0 ®® Proposal for Project Study Report Equivalent and Conceptual Engineering Plans for Santa Ana Boulevard Grade Separation Project