FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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DIGESTER K DOME REPAIR AT PLANT NO. 2, PROJECT NO. FR2-0032, SPECIFICATION NO. S-2024-630BD
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Services Contract to Structural Preservation Systems for Digester K Dome Repair at Plant No. 2, Project No. FR2-0032, Specification No. S-2024-630BD, for a total amount not to exceed $876,707; and
B. Approve a contingency of $131,506 (15%).
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BACKGROUND
Orange County Sanitation District (OC San) Digesters I, J, and K at Plant No. 2 are used as holding tanks for digested sludge prior to sludge dewatering by the downstream dewatering centrifuges.
Digester K, built in 1971, has been out of operation and empty since 2021 due to required structural repairs under this project.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award a contract to lowest responsive, responsible bidder text here
* Protect OC San assets
* 24/7/365 treatment plant reliability
* Commitment to safety & reducing risk in all operations
PROBLEM
The Digester K Dome cannot hold gas pressure due to multiple full penetration cracks on the dome surface. The concrete dome also lacks adequate rebar cover and concrete thickness in some locations, which was identified during the structural condition assessment. Multiple efforts to spot-repair the cracks have been attempted in the past but did not produce successful results. Repairs are required to bring Digester K back into service.
PROPOSED SOLUTION
Approve a Services Contract for Digester K Dome Repair at Plant No. 2, Project No. FR2-0032, Specification No. S-2024-630BD. The project will repair full penetration cracks and address previously repaired cracks that failed for the entire digester dome. Cracks will be repaired by injecting a crack resin designed to fill ...
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