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:
Approve a contingency increase of $456,000 to the existing Construction Contract Agreement with Sancon Technologies, Inc., for Newhope-Placentia Sewer Manhole Replacements, Project No. FE21-08, for a new total contingency of $1,537,902 (378%).
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BACKGROUND
Orange County Sanitation District (OC San) operates and maintains the Newhope-Placentia Trunk Sewer system, which includes several manhole structures originally constructed in 1958. As part of a previously approved construction contract for the Newhope-Placentia Sewer Manhole Replacements project, OC San identified three manholes for repair or rehabilitation to extend their service life.
In September 2025, the OC San Board of Directors approved an urgent contingency increase to the existing construction contract to allow partial replacement of Manholes NHP0020 and NHP0135 rather than just rehabilitation. The estimated costs were based only on the scope of work known at the time.
In October 2025, OC San assessed the condition of Manhole NHP0135 and confirmed that it is in similar condition to Manhole NHP0020 and would require partial replacement rather than rehabilitation.
As of January 2026, Manhole NHP0020, located near the Plant No. 1 entrance, has been reconstructed. The condition of the third manhole included in the contract was also assessed and confirmed to be suitable for rehabilitation as originally planned.
A visual assessment of the Manhole NHP0205 concrete determined that it was in good enough condition to be coated under OC San's blanket manhole maintenance repair contract. As a result, Manhole NHP0205 has been removed from this project.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award const...
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