25G - ENGINEERING SRVS GRADE SEPARATION

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rail profile. 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; that is to build the wall first, and then excavate the roadway in front of the wall to final grade. We will perform Value Analysis to determine the most cost effective retaining wall type, top down approach vs. conventional cantilever retaining wall using temporary shoring. A Single Span Structure Alternative can also be considered. The span length required to span the Santa Ana Boulevard roadbed is approximately 134'. The typical span range for this type of construction extends to about 150-ft under Cooper E-80 loading. Therefore, even though the required span is nearing the upper limit of the typical structure span length, this structure type is suitable for construction of new underpass. The total structure depth for the replacement of the double track would be approximately 13'-6"_ Provisions can be made in the bridge design so that is capable of supporting a future third track, should this become a requirement of OCTA/SCRRA. To support a possible third track, the through girder, on the either left or right side of the underpass, will be required to have a structure depth approaching 15' in order to support the full weight of a Cooper E-80 live load. During the APS development, through a careful and deliberate process, we will study a number of different structure alternatives and configurations against various interchange alternatives, and develop associated costs. Deliverables: Draft and Final Structure Type Selection Report Task 1.7 Existing and Future Utilities Issues/Permitting Utility Impacts/Coordination We will identity and coordinate with the various utility companies for the location and descriptions of their facilities, including any potential for future utility improvements. Utility Meetings and Utility Coordination Coordinate and schedule meetings with Utility Owners and project stake holders as may be required. Existing Utility Research We will provide utility research services to include: • Notify Underground Service Alert and request a listing of member utility companies within the project area. - Make a field reconnaissance of the utilities within the project area. • Send a written notice to the identified utility companies in the proposed project area notifying them of the proposed project, and request copies of their existing utility maps and information regarding their plans for future improvements- • Prepare a preliminary Utility Conflict Maps from record information and field observations showing those utilities to be protected in place and those to be relocated to clear construction. • Overhead lines will be located and vertical clearance will be determined over the proposed improvements to assure that minimum vertical clearance is maintained. - Determination of prior rights as they relate to responsibility for the cost of relocations. Ci[y S-1-4- 25G-159