FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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480 VOLT CABLE REPLACEMENT AT PLANT NO. 2 HEADWORKS, PROJECT NO. MP-509
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Receive and file Bid Tabulation and Recommendation for 480 Volt Cable Replacement at Plant No. 2 Headworks, Project No. MP-509;
B. Award a Construction Contract to Mass. Electric Construction Co. for 480 Volt Cable Replacement at Plant No. 2, Project No. MP-509, for a total amount not to exceed $434,327; and
C. Approve a contingency of $86,865 (20%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) Headworks lifts sewage from the collections system into the Treatment Plant and provides vital preliminary treatment to all incoming wastewater by removing trash and debris that would otherwise damage downstream treatment equipment.
Electrical cables provide the energy to pumps, fans, augers, meters, and other equipment to make this process function correctly. These cables are routed through underground ducts to connect the motor control centers to devices. These cables are subject to wet conditions. Any deterioration of the cable insulation can result in short circuit or ground fault conditions, which puts the associated equipment out of service.
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
PROBLEM
Recently, electrical cables to some critical Headworks process equipment have failed which resulted in equipment being out of service.
PROPOSED SOLUTION
Award a construction contract for 480 Volt Cable Replacement at Plant No. 2 Headworks, Project No. MP-509, to install new power and control cables in existing spare conduits to repower 13 affected pieces of equipment. Staff is requesting a contingency of 20...
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