FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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THICKENING AND DEWATERING BUILDING PIPE SUPPORT IMPROVEMENTS AT PLANT NO. 1, PROJECT NO. FE20-06
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Thickening and Dewatering Building Pipe Support Improvements at Plant No. 1, Project No. FE20-06;
B. Award a Construction Contract to Garney Pacific, Inc. for Thickening and Dewatering Building Pipe Support Improvements at Plant No. 1, Project No. FE20-06 for an amount not to exceed $793,000; and
C. Approve a contingency of $79,300 (10%).
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BACKGROUND
Sludge Dewatering and Odor Control at Plant No. 1, Project No. P1-101, completed a new Thickening and Dewatering facility in 2020. The facility includes three thickening centrifuges and three dewatering centrifuges. The thickening centrifuges increase the sludge solids concentration to the anaerobic digesters. The dewatering centrifuges remove water from the anaerobically digested sludge to reduce biosolids hauling and disposal costs.
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
* 24/7/365 treatment plant reliability
PROBLEM
Excessive vibration is occurring in the sludge piping to the thickening centrifuges, and from the thickening centrifuges. This vibration becomes worse with increasing flows. At higher flow rates, the vibration causes excessive wear on the pumps and creates the potential for the discharge piping to fail. Standard pipe supports are not an option because of the congestion in the ceiling area with so many other conduits, pipes, and cable trays.
PROPOSED SOLUTION
Award a Construction Contract for Thickening and Dewatering Building Pipe Support Improvements at Plant No. 1, P...
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