FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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LIQUID OXYGEN TANK B REPLACEMENT AT PLANT NO. 2, PROJECT NO. FE22-02
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Services Contract with J.R. Filanc Construction Company, Inc. to provide the Liquid Oxygen Tank B Replacement at Plant No. 2 (FE22-02), Specification No. S-2023-1426BD, for a total amount not to exceed $3,098,000; and
B. Approve a contingency in the amount of $309,800 (10%).
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BACKGROUND
The first step in the activated sludge secondary treatment process at Orange County Sanitation District's (OC San) Plant No. 2 requires the injection of liquid oxygen (LOX) into the reactors. LOX is delivered by truck and stored in two 40,000-gallon pressurized vessels, Tank A and Tank B, which were installed in 1977. Tank A failed in 2018 and repair attempts were unsuccessful. Tank A is in the process of being replaced with completion anticipated in the third quarter of 2024.
RELEVANT STANDARDS
* Sustain 1, 5, 20-year planning horizons
* Maintain a proactive asset management program
* 24/7/365 treatment plant reliability
PROBLEM
Tank B has reached the end of its useful life and needs to be replaced to provide a reliable and redundant LOX storage system. Having two working 40,000-gallon tanks provides backup LOX storage, maintains operation when one tank or its associated equipment is out of service due to failure or maintenance, and makes OC San less vulnerable and reliant on more frequent LOX deliveries when it is difficult to get oxygen, like during the recent pandemic. Each LOX tank has six days of storage capacity. If OC San was not able to get LOX, there would be a loss of secondary treatment capacity at the Plant No. 2 activated sludge facility for non-reclaimable wastewater, requiring OC San to combine the non-reclaimable and reclaimable flows, thus reducing the total reclaimable ...
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