FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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SODIUM HYDROXIDE (NAOH)(CAUSTIC SODA) 50% SOLUTION
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GENERAL MANAGER'S RECOMMENDATION
recommendation
RECOMMENDATION: Recommend to the Board of Directors to:
A. Award a Chemical Supplier Agreement to Brenntag Pacific, Inc. for the purchase of sodium hydroxide (caustic soda) 50% solution, Specification No. C-2023-1417BD, for the period of October 1, 2023 through September 30, 2024, for a unit price of $676 per dry ton, delivered, plus sales tax, for a total estimated annual amount of $672,620;
B. Approve option to renew the Chemical Supplier Agreement for up to four (4) one-year periods; and
C. Approve renewal adjustments of unit pricing with a not to exceed 25% contingency.
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BACKGROUND
The Orange County Sanitation District (OC San) utilizes two programs for controlling odor and corrosion in the collection system: continuous chemical dosing and intermittent dumping of sodium hydroxide (caustic soda). In 1989, OC San began using caustic soda to prevent the generation of hydrogen sulfide in the sewer trunk lines which causes odor and corrosion. Specific trunklines not treated by continuous-chemical dosing facilities are a candidate for intermittent dosing with caustic soda. For these sewers, caustic soda is batch dumped from the supplier's tank truck directly into the pipeline. This shock-dose treatment kills the bacteria layer on the inside of the pipe that forms hydrogen sulfide (dissolved and gaseous) in the sewage. Hydrogen sulfide generation levels are monitored through routine sampling and compared to pre-established acceptable levels of service.
RELEVANT STANDARDS
* Comply with Odor Control Master Plan
* 12 or fewer odor complaints per year under normal operating conditions in the collection system
* Protect OC San assets
PROBLEM
The conveyance of wastewater in the collection system has the ...
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