FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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ACTIVATED SLUDGE CLARIFIER REPAIRS AT PLANT NO. 2, PROJECT NO. FR2-0018R
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Receive and file Bid Tabulation and Recommendation for Activated Sludge Clarifier Repairs at Plant No. 2, Project No. FR2-0018R;
B. Award a Construction Contract to Garney Pacific, Inc. for Activated Sludge Clarifier Repairs at Plant No. 2, Project No. FR2-0018R for an amount of $5,091,686; and
C. Approve a contingency of $509,169 (10%).
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BACKGROUND
The Activated Sludge facility at Orange County Sanitation District (OC San) Plant No. 2 uses chain and flight mechanisms to collect sludge settling along the length of the rectangular clarifiers and to deliver the sludge to hoppers located at the upstream end. The collectors, which include 2,900 feet of plastic chains and 160 flights per clarifier, are subject to degradation and wear. The collector mechanisms were replaced in six of the clarifiers in 2020; the collectors in the remaining six clarifiers have been in service since 1996.
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
The collectors in six of the clarifiers are at the end of their useful life, resulting in a number of recent total failures that required expensive repairs during which the clarifiers were unavailable for service for many weeks.
PROPOSED SOLUTION
Award a Construction Contract for Activated Sludge Clarifier Repairs at Plant No. 2, Project No. FR2-0018R. This project will replace the sludge collection mechanisms in the six remaining clarifiers.
TIMING CONCERNS
The collectors will continue to require frequent maintenance. The clarifiers must be reliab...
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