FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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SANTA ANA TRUNK REHABILITATION AT PLANT NO. 1, PROJECT NO. FE20-07
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Santa Ana Trunk Rehabilitation at Plant No. 1, Project No. FE20-07;
B. Award a Construction Contract to Sancon Technologies, Inc. for Santa Ana Trunk Rehabilitation at Plant No. 1, Project No. FE20-07, for an amount not to exceed $395,082; and
C. Approve a contingency of $79,016 (20%).
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BACKGROUND
The Santa Ana Trunk, which carries sewage from the southern portion of Santa Ana and the northern portion of Costa Mesa to Orange County Sanitation District (OC San) Plant No. 1, was originally constructed in the early 1950s. The final 300-foot section of this sewer just west of the Santa Ana River is constructed of unlined 48-inch diameter concrete pipe.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Maintain a proactive asset management program
PROBLEM
A condition assessment of this sewer and associated maintenance structures revealed severe defects, including exposed aggregate and reinforcement steel in the pipeline, as well as exposed aggregate and liner detachment in the maintenance structures.
PROPOSED SOLUTION
Award a construction contract for Santa Ana Trunk Rehabilitation at Plant No. 1, Project No. FE20-07. The project will install a cured-in-place liner in approximately 300 feet of trunk sewer and perform rehabilitation of two maintenance structures at Plant No. 1. To accommodate installation of the liner, staff has determined that flows in the sewer can be completely diverted to a parallel sewer, so bypass pumping will not be required.
The flow diversion must be coordinated with major shutdowns for Headwo...
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