FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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NEWHOPE-PLACENTIA SEWER MANHOLE REPLACEMENTS, PROJECT NO. FE21-08
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Newhope-Placentia Sewer Manhole Replacements, Project No. FE21-08;
B. Award a Construction Contract Agreement to Sancon Technologies, Inc., for Newhope-Placentia Sewer Manhole Replacements, Project No. FE21-08, for a total amount not to exceed $406,730; and
C. Approve a contingency of $81,346 (20%).
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BACKGROUND
The Orange County Sanitation District (OC San) operates an extensive network of sewer infrastructure, and as part of its ongoing maintenance and modernization efforts, three manholes in the Newhope-Placentia Trunk Sewer (NHP) system were identified for potential replacement. Originally constructed in 1958, these manholes had sustained significant deterioration due to hydrogen sulfide corrosion, a common issue in wastewater systems. However, after a more detailed evaluation, it was determined that rather than full replacement, the manholes could be rehabilitated to meet modern standards and extend their functional lifespan.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Commitment to safety & reducing risk in all operations
PROBLEM
Three NHP manholes are severely corroded. Hydrogen sulfide corrosion has eroded the concrete extensively, leaving the reinforcing rebar exposed.
PROPOSED SOLUTION
Award a construction contract agreement for Newhope-Placentia Sewer Manhole Replacements, Project No. FE21-08. This project will rehabilitate the three manholes to extend their service life ranging between 25 to 50 years depending on the rehabilitation approach.
A 20% contingency is requested due to the higher level of risk...
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