FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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WASTE SIDESTREAM PUMP STATION VFD REPLACEMENTS AT PLANT NO. 1, PROJECT NO. FR1-0016
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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 Waste Sidestream Pump Station VFD Replacements at Plant No. 1, Project No. FR1-0016;
B. Award a Construction Contract to Leed Electric, Inc. for Waste Sidestream Pump Station VFD Replacements at Plant No. 1, Project No. FR1-0016, for an amount not to exceed $344,889; and
C. Approve a contingency of $51,733 (15%).
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BACKGROUND
The Waste Sidestream Pump Station transfers flows from storm drains, sump pumps, and waste backwash from the Orange County Water District Groundwater Replenishment System to primary clarifiers for treatment.
The pump station consists of three 60-horsepower pumps. The output of the pumps can be varied using variable frequency drives (VFDs).
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Maintain a proactive asset management program
PROBLEM
The existing VFDs were installed in 1994 and are at the end of their useful service life. Replacement parts and manufacturer support services are no longer available. These VFDs are critical for the operational capacity of the pump station.
PROPOSED SOLUTION
Award the construction contract for Waste Sidestream Pump Station VFD Replacements at Plant No. 1, Project No. FR1-0016, to replace three 60-hp VFDs to maintain operation and reliability of the pump station.
A higher-than-usual contingency is requested due to a higher level of risk associated with replacement of the VFDs and feeder cables. If an unknown condition is encountered and there is insufficient contingency, contract completion could be s...
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