FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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HVAC REPLACEMENT FOR PLANT NO. 2 CENTRIFUGE BUILDING, OPERATIONS BUILDING, AND BITTER POINT PUMP STATION, PROJECT NO. SC22-02
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve Purchase Order and Master Turnkey Agreement with Trane U.S. Inc., for the HVAC Replacement for Plant No. 2 Centrifuge Building, Operations Building, and Bitter Point Pump Station, Project No. SC22-02, utilizing the Omnia Cooperative Purchasing Agreement, Contract Number 3341, for a total amount not to exceed $2,746,477; and
B. Approve a contingency of $274,647 (10%).
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BACKGROUND
The Orange County Sanitation District's (OC San) Centrifuge Building server room is equipped with three air conditioning units and associated condensers, installed in 2020. The Operations Building has two split units and one packaged unit, installed in 1995 and 1996, respectively. The Bitter Point Pump Station electrical room has a split unit installed in 2011. These HVAC systems regulate temperature for staff and maintain optimal conditions for critical SCADA servers and electrical equipment by controlling temperature and humidity.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
PROBLEM
The HVAC systems in the Centrifuge Building and the Bitter Point Pump Station were designed to accommodate larger demands than currently required. Because they are oversized, the HVAC systems cycle on and off too quickly and do not run long enough to effectively remove moisture from the air. This results in higher humidity levels, which pose a threat to the Centrifuge Building's SCADA servers and the Bitter Point Pump Station's variable frequency drives that control the pumps. The SCADA servers in the Centrifuge Building have previously failed due to high humidity. Portable dehumidifiers were installed as a temporarily solution.
The HVAC units in...
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