FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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SANTA ANA TRUNK SEWER REHABILITATION, PROJECT NO. 1-23
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
Approve an agreement with the Union Pacific Railroad Company (UPRR) for the installation and operation of a temporary, above grade, bypass pipe in the UPRR right-of-way during the construction of Santa Ana Trunk Sewer Rehabilitation, Project No. 1-23, in the amount of $373,770, in a form approved by General Counsel.
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BACKGROUND
The Santa Ana Trunk carries sewage from the southern portion of the cities of Santa Ana and Costa Mesa to Orange County Sanitation District (OC San) Plant No. 1. This sewer was originally constructed in the early 1950s and consists of unlined 42-inch and 48-inch diameter reinforced concrete pipes. Over the past 60 years, several projects have replaced or rehabilitated small portions of the sewer and rehabilitated most of the manholes.
The project area for the Santa Ana Trunk Sewer Rehabilitation is located on Alton Avenue heading west from Bristol Street then diagonally through easements in a light industrial/commercial area toward Plant No. 1. There is an UPRR right-of-way that runs parallel to Alton Avenue.
RELEVANT STANDARDS
* Protect OC San assets
* Maintain collaborative and cooperative relationships with regulators, stakeholders, and neighboring communities
* Maintain a culture of improving efficiency to reduce the cost to provide the current services level or standard
PROBLEM
To facilitate the required rehabilitation work, sewer flows along Alton Avenue must be bypassed. In addition, several flows originating north of the UPRR tracks need to be intercepted and rerouted around the bypassed section. The only viable route for this bypass piping is through the UPRR right-of-way. UPRR requires an agreement to allow OC San use of their right-o...
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