FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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HEADWORKS REHABILITATION AT PLANT NO. 1, PROJECT NO. P1-105
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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 Headworks Rehabilitation at Plant No. 1, Project No. P1-105;
B. Award a Construction Contract to Kiewit Infrastructure West Co. for Headworks Rehabilitation at Plant No. 1 for a total amount not to exceed $222,330,000; and
C. Approve a contingency of $8,893,200 (4%).
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BACKGROUND
The headworks of a wastewater treatment plant is where all incoming sewers converge through a series of pipes, meters, flow diversions, and gates. Just as sewers cannot be readily taken out of service, neither can a headworks.
The current Headworks facilities at Orange County Sanitation District's (Sanitation District) Plant No. 1 include the original facilities built and modified between the 1950s and 1960s, currently only used for emergencies, and the active facilities which entered service in 1989. The facilities are mechanically intensive, operate in a very corrosive environment, require frequent maintenance and servicing, and can generate substantial odors.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsible bidder
* 24/7/365 treatment plant reliability
* Zero odor incidents/events under normal operating conditions for Plant Nos. 1 and 2
PROBLEM
The existing headworks has been in service for more than 30 years without a significant rehabilitation effort. Mechanical equipment is at the end of its useful life. Structural and piping corrosion must be addressed to extend the useful life. Electrical equipment is deficient and obsolete. The grit removal system, which is intended to capture abrasive material that causes accelera...
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