FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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TRICKLING FILTER 480 VOLT CABLE REPLACEMENT AT PLANT NO. 1, PROJECT NO. FR1-0008
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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 Trickling Filter 480 Volt Cable Replacement at Plant No. 1, Project No. FR1-0008;
B. Award a Service Contract to Baker Electric, Inc. for Trickling Filter 480 Volt Cable Replacement at Plant No. 1, Project No. FR1-0008 for an amount not to exceed $251,586; and
C. Approve a contingency of $50,317 (20%).
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BACKGROUND
The Trickling Filters at Orange County Sanitation District (OC San) Plant No. 1, which were completed in 2006, provide approximately 20% of the plant's secondary treatment capacity.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
PROBLEM
Recently, a number of electrical cables in the Trickling Filter process have shorted out due to a failure with the cables' insulation. The equipment driven by these cables cannot be operated until the cables are replaced. Repairing the cables is typically not feasible because the location of the short cannot be determined. These failures have significantly impacted the reliability of the trickling filter process.
PROPOSED SOLUTION
Award a Service Contract for Trickling Filter 480 Volt Cable Replacement at Plant No. 1, Project No. FR1-0008. This project will install new power and control cables for 14 affected pieces of equipment.
Staff has found from similar projects that additional cables may fail by the time this work is completed. In those cases, it is more cost effective to replace the cable at the time the contractor is mobilized than initiating a new contract. For this reason, staff is requesting a higher-than-usual contingency of 20% to replace additio...
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