FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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PRIMARY CLARIFIERS F AND G ROTATING MECHANISM REHABILITATION AT PLANT NO. 2, PROJECT NO. FE23-09, SPECIFICATION NO. S-2024-612BD
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Services Contract to Vicon Enterprise, Inc. for Primary Clarifiers F and G Rotating Mechanism Rehabilitation at Plant No. 2, Project No. FE23-09, Specification No. S-2024-612BD, for a total amount not to exceed $3,150,000; and
B. Approve a contingency of $472,500 (15%).
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BACKGROUND
The A-side Primary Clarifiers, originally constructed in 1962, consist of four circular clarifiers responsible for treating non-reclaimable flows at Orange County Sanitation District's (OC San) Plant No. 2. Under normal operations, three clarifiers are in service, with the fourth serving as a redundant or backup unit. In February of 2023, Clarifier F failed due to metal loss from corrosion at the connections between the rotating mechanism and center cage structure. An inspection of Clarifier G showed similar levels of corrosion, raising concerns that its rotating mechanism could fail at any time. Consequently, Clarifiers F and G have remained offline since then. The A-Side is currently operating with only Clarifiers D and E in service. A-Side Primary Clarifiers Replacement at Plant No. 2, Contract No. P2-98A, is currently constructing four new A-Side clarifiers due to age and condition, which are expected to be completed by late 2027.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* 24/7/365 treatment plant reliability
PROBLEM
The A-Side clarifiers are currently running with reduced treatment capacity during dry weather operating conditions due to Clarifiers F and G being out of service. Operating less than three primary basins m...
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