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TO: Mayor Richard C. Irvin
FROM: David E. Schumacher, P.E.; Superintendent of Water Production
DATE: October 24, 2019
SUBJECT:
A resolution authorizing H3 Services LLC (Decatur, IN) to provide and install three protective liners in three existing sodium hypochlorite bulk storage tanks for the Water Production Division.
PURPOSE:
To obtain City Council authorization for the purchase of services to install three liners in three sodium hypochlorite bulk storage tanks at the City of Aurora Water Treatment Plant (WTP). H3 Services LLC (H3) will provide the liner and installation as a complete service.
BACKGROUND:
The Water Production Division (WPD) utilizes sodium hypochlorite in the disinfection process at the WTP. Sodium hypochlorite is a liquid chemical that is stored in one or more of four bulk storage tanks. The tanks themselves are constructed of concrete. The concrete surface requires protection from direct contact with the liquid sodium hypochlorite. When originally constructed in 2002, the concrete tanks were lined with an applied coating or paint. The WPD has struggled with multiple failures of this coating since 2002. Numerous costly and time consuming spot repairs have been made to the coating over the same period on an almost annual basis.
DISCUSSION:
After several years of investigation, in early 2019, the WPD became aware of a physical liner made of material that is compatible with sodium hypochlorite that could readily be installed in the bulk tanks in a manner similar to a swimming pool liner. The liner itself is a specialized material and is custom made to fit the exact dimensions of the specific bulk tank.
Prior to the work being completed, two vendors, including H3, who are qualified to perform this specific type of work were contacted for pricing. H3 was the only vendor to submit a quotation. The other vendor, after assessing the project, was no longer interested and did not submit a quotation. H3 performs specialized liner ...
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