FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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PROCUREMENT OF TWO BAR SCREEN CARRIAGE ASSEMBLIES AT PLANT NO. 2
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Sole Source Purchase Order to Veolia WTS Services, USA, formerly Suez Treatment Solutions, to procure two complete carriage assembly Bar Screen Units for Plant No. 2, for a total amount not to exceed $433,092, plus applicable sales tax; and
B. Approve a contingency of $43,309 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) Plant No. 2 Headworks facility has six bar screen assemblies to provide screening removal of solids and other non-biodegradables from influent wastewater. During normal operations, the bar screens run in split mode: three (3) screens serve the non-reclaimable influent flow, and three (3) screens serve the reclaimable influent flow. As unfiltered wastewater passes through a bar screen, debris collects on the steel bars. A mechanical rake removes large objects such as rags, trash, wood, and other debris from the bars and allows the influent wastewater to enter Headworks for further treatment.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
* Comply with environmental permit requirements
PROBLEM
Currently, one bar screen unit is damaged beyond repair and requires replacement. With limited redundancy of the remaining bar screens, OC San will not be able to meet obligations with reclaimed water flow to OCWD.
PROPOSED SOLUTION
Procure two new carriage assemblies from the Original Equipment Manufacturer (OEM), Veolia WTS Services, USA, for one (1) carriage assembly to replace the damaged bar screen, and one (1) spare assembly to OC San's inventory, which will reduce the risk of significant downtime and equipment unavailability for these critical assets.
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