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COUNCIL COMMUNICATION FORM <br /> PURCHASING & INTERNAL SERVICES MEMORANDUM <br /> #14-20 <br /> November 20, 2014 <br /> TO: Honorable Mayor McElroy and City Council <br /> FROM: Ryan P. McCrady, City Manager <br /> Gregg Zientara, Financial Management Director <br /> Deborah M. Perry, Purchasing Supervisorcq <br /> SUBJECT: Bids for water treatment chemicals <br /> SUMMARY RECOMMENDATION: Staff recommends awarding contracts to the low bidders <br /> meeting specifications listed on Exhibit A for each of the water treatment chemicals for January 1, 2015 — <br /> December 31, 2015. <br /> BACKGROUND: The following is a list of the chemicals and how they are used in the water <br /> purification process. <br /> Alum—to coagulate; clarifying agent <br /> Carbon—used for taste and odor control; control of atrazine and other compounds <br /> Carbon Dioxide—lowers the pH level <br /> Chlorine—disinfectant <br /> Hydrofluosilicic Acid—reduces tooth decay <br /> Lime— softening agent <br /> Sodium Chloride—assists to remove nitrate from water <br /> Sodium Chlorite—disinfectant; used for taste and odor control <br /> Sodium Hexametaphosphate — used to counteract calcium hydroxide; prevents scaling; filter <br /> protection <br /> The City of Decatur implemented a performance based evaluation for Powdered Activated Carbon (PAC). <br /> Potential bidders were requested to submit PAC samples to an independent testing firm (Engineering <br /> Performance Solutions of Gainesville, FL)to evaluate product performance. Six vendors submitted eight <br /> products. <br /> Each product was evaluated and assigned a performance factor based on its ability to remove 60% of two <br /> of the most commonly occurring chemicals attributed to the unpleasant taste and odor characteristics of <br /> drinking water (2-Methylisoborneol [MIB] and Geosmin). <br />