FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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ELECTRICAL POWER DISTRIBUTION SYSTEM IMPROVEMENTS, PROJECT NO. J-98
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for Electrical Power Distribution System Improvements, Project No. J-98;
B. Award a Construction Contract Agreement to Shimmick Construction Company, Inc., for Electrical Power Distribution System Improvements, Project No. J-98, for a total amount not to exceed $ 24,352,127; and
C. Approve a contingency of $2,435,213 (10%).
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BACKGROUND
The electrical distribution systems at Orange County Sanitation District (OC San) Plant Nos. 1 and 2 supply power to all plant facilities and consist of distribution centers, power buildings, and electrical rooms throughout both plants. These facilities use switchgear and automatic transfer switches to distribute power from three different generation sources, Southern California Edison (SCE), Central Generation Facility (CenGen), and standby generators.
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 OC San assets
PROBLEM
During an SCE power outage at Plant No. 1, CenGen is not capable of powering the entire plant, resulting in CenGen shutting down and select critical loads being automatically powered by standby generators. The remaining loads required for wastewater treatment will not be powered until the central generation facility is restarted, and electrical maintenance is called out to reconfigure the electrical system. In addition, there is a high arc flash potential at a number of electrical switchgear lineups throughout Plant No. 1.
At Plant No. 2, the plant power monitoring and control system and arc flash mitigation system were not ex...
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