BOARD AGENDA MEMORANDUM
SUBJECT:
Title
Approve Sole Source Purchase of Two (2) Online Trihalomethane (THM) Analyzers from Aqua Metrology Systems Limited (AMS) for Continuous Finished Water THM Monitoring at the Rinconada Water Treatment Plant (Project No. 93291012) and Penitencia Water Treatment Plant (Project No. 93231009) for a Not-To-Exceed amount of $200,000.
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RECOMMENDATION:
Recommendation
Authorize the Chief Executive Officer to negotiate, execute, and amend the sole source purchase of two (2) online THM analyzers from AMS to obtain real-time THM data at Rinconada and Penitencia Water Treatment Plants from Aqua Metrology Systems Limited (AMS), in a not-to-exceed cost of $200,000.
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SUMMARY:
THMs are byproducts of the water treatment process. They are formed when natural organic material, such as the decaying vegetation commonly found in lakes and reservoirs, reacts with chlorine used to treat the water. This reaction produces disinfection byproducts, the most common of which are THMs. THMs are regulated compounds in drinking water, and the current drinking water maximum contaminant level (MCL) is 80 micrograms per liter. Levels of THM can be affected by seasonal changes in source water quality or by changing amounts of disinfectant added.
During the last drought in 2014 to 2015, Rinconada Water Treatment Plant (RWTP) experienced elevated THM in the finished water due to deteriorating source water quality caused by the drought conditions. To better predict and manage THM formation, Staff contacted two companies, which currently produce and supply online THM analyzers, to obtain loaner equipment for the purpose of conducting real time side-by-side analysis and comparison study prior to selecting the instrument that best meets our needs.
Staff proceeded to pilot the two available online THM analyzers in a side-by-side comparison study to provide real-time THM data to assist RWTP Operations with process optimization. The two THM analyzers w...
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