FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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DIGESTER C, D, F, AND G MECHANICAL REHABILITATION AT PLANT NO. 2, PROJECT NO. FE20-02
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Digester C, D, F, and G Mechanical Rehabilitation at Plant No. 2, Project No. FE20-02;
B. Award a Construction Contract Agreement to J.F. Shea Construction, Inc. for Digester C, D, F, and G Mechanical Rehabilitation at Plant No. 2, Project No. FE20-02, for a total amount not to exceed $3,694,000; and
C. Approve a contingency of $369,400 (10%).
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BACKGROUND
The digester system at Orange County Sanitation District's (OC San) Plant No. 2 processes sludge to reduce pathogens and volatile organics and generates methane gas for power and heat. This digester system includes pumps, heat exchangers, and gas piping.
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
* Protect public safety
* Safe, beneficial reuse of Biosolids
* Commitment to safety & reducing risk in all operations
PROBLEM
The existing high rate mixing pumps, heat exchangers, heated sludge recirculation pumps, sludge transfer pumps, hot water pumps, and associated instrumentation for Digesters C, D, F, and G are at the end of their useful life and require replacement. In addition, the elevated walkways between Digesters C and D, Digesters D and I, and Digesters F and G need structural repairs and the 8-inch PVC gas balance pipes need replacement.
PROPOSED SOLUTION
Award a Construction Contract Agreement for Digester C, D, F, and G Mechanical Rehabilitation at Plant No. 2, Project No. FE20-02. This project will replace the mechanical equipment and associated piping, replace high rate mixing pumps with chopper ...
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