File #: 2023-3200    Version: 1 Name:
Type: Consent Status: Passed
File created: 9/7/2023 In control: OPERATIONS COMMITTEE
On agenda: 9/27/2023 Final action: 9/27/2023
Title: SODIUM HYDROXIDE (NAOH)(CAUSTIC SODA) 50% SOLUTION
Sponsors: Riaz Moinuddin
Attachments: 1. Agenda Report, 2. Chemical Supplier Agreement_Brenntag
Related files: 2023-3070
FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance

SUBJECT:

title
SODIUM HYDROXIDE (NAOH)(CAUSTIC SODA) 50% SOLUTION
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GENERAL MANAGER'S RECOMMENDATION

recommendation
RECOMMENDATION:

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 potential to cause odor nuisance compla...

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