FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 1 PRIMARY EFFLUENT PUMP STATION PUMP NO. 3 VARIABLE FREQUENCY DRIVE REPLACEMENT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Purchase Order Contract for the purchase and installation of a replacement variable speed drive for Plant No. 1 Primary Effluent Pump Station Pump No. 3, using the U.S. Communities Master Agreement No. EV2370, to Graybar Electric, for an amount not to exceed $113,890, including Sales Tax and Freight (FOB Destination); and
B. Approve a contingency of $11,389 (10%).
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BACKGROUND
The Orange County Sanitation District's (Sanitation District) Primary Effluent Pump Station (PEPS) contains three 45-million gallon per day pumps that feed a portion of the secondary treatment facilities at Plant No. 1. PEPS Pump Nos. 1 and 2 are driven by electric motors with new Variable Frequency Drives (VFD) to regulate the rate of flow into the secondary treatment facilities.
RELEVANT STANDARDS
* Protect OC San assets
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
PROBLEM
The existing PEPS Pump No. 3 VFD was installed in 1993. The 28-year-old VFD is out of service, obsolete, and no longer repairable. An operational and reliable VFD is required to manage peak wet weather flows, provide a standby pump, and mitigate the risk of a primary effluent spill.
PROPOSED SOLUTION
Staff recommends replacing PEPS Pump No. 3 VFD with a new turn-key solution from US Communities/Graybar. The new VFD will allow the PEPS to reliably operate and will reduce risk in emergency conditions to manage peak wet weather flow events.
TIMING CONCERNS
Proceeding expeditiously to restore pump station capacity prior to an upcoming CIP project, Project No. P1-133, will improve reliability and reduce operational risks.
RAMIFICATIONS OF NOT TAKING ACTION
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