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Bridge Structural Design Services River Hydraulics As the reconstructed north section of the bridge must match the same configuration as the existing southerly section of the bridge, there will be minimal impact to the channel hydraulics. The river will be modeled with the new structure width to ensure there is no impact. Scour analysis will not be required as the channel is already concrete lined. Utilities DMJM Harris takes an established and successful proactive approach in utility coordination, following the process shown in Figure 5. Extensive coordination throughout the design phase is critical to minimize the potential for delays due to utility relocations. DMJM Harris has developed a strong working relationship with the utility companies and understand their requirements. A proactive approach in conducting coordination meeting both as a group and individually with the utility companies is essential. From our field observations and data research, the following impacted utilities have been identified: Figure 5. The six -step utility coordination and relocation process. Aerial Facilities: Southern California Edison (SCE) and AT&T have aerial facilities located along the north side of First Street that will have to be relocated to the new sidewalk. (Photo 8) This will require close coordination, especially during construction, as the retaining wall that is required in the northeast quadrant must be constructed first, and the roadway backfilled to its new grade prior to relocating the impacted poles. As the existing poles must remain in place until the retaining wall is constructed, it will potentially impact the construction of the bridge foundations due to the vertical clearances. 0401 324-5557 Photo 8. SCE and AT&T aerial facilities will be relocated to the north. The DMJM Harris design will take this into consideration by use of drilled shaft or steel segmented piles which can be built with limited clearances. DMJM HARRIS AECOM City Water Main: The City has a Photo 9. Bridge design must address cement coated 16- the City water main located on south side of the bridge. inch water main that is affixed to the bridge deck on the south side of the bridge, outside of the exterior girder. (Photo 9) There are two approaches in addressing this water main: Protect in place: The new bridge deck will be doweled into the existing bridge deck leaving the water main intact. The disadvantage to this approach is that the water main would no longer be accessible from the outside of the bridge as it would be under the bridge in between the girders, and would be inaccessible for periods of time due the inability to move equipment into the river. Relocate: With the first stage of construction consisting of the northerly widening, the water main could be relocated in the completion of that stage, locating the water main on the north side of the bridge on the outside of the exterior girder. This would allow easier access and visual inspection of the water main, though the project would bear the cost of the relocation. County Irrigation Facilities: A 6 -inch reclaimed water main and 2 -inch electrical conduit exist on the east side, crossing under the bridge. (Photo 10) These facilities will be relocated outside the widened portion of the bridge, clear of construction.