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COUNCIL CONIMUNICATION FORM <br /> PURCHASING& INTERNAL SERVICES MEMORANDUM <br /> #18-0 2 <br /> November 21, 241$ <br /> TU: Hanarable Mayor Maore Wa1fe and City Cauncil <br /> FR4M: Bi1iy Tyus, Interim City Manager <br /> Gregg Zientara, Financial Management Director <br /> Debarah M.Perry, Purchasing Supervisor <br /> SUBJECT: Bids for water treatment chemicals <br /> SUMIVIARY RECOMMENDATION: Staff recomrnends awarding contracts ta the low bidders <br /> meeting specifications listed on Exhibit A for each of the water treatment chemicals for January 1, 2019— <br /> December 31, 2019. <br /> BACKGROUND: The following is a list of the chemicals and haw they are used in the water <br /> purificatian pracess. <br /> Alum—to coagulate; clarifying agent <br /> Carbon—used for taste and odar contral; control of atrazine and other compounds <br /> �arbon Diaxide—lowers the pH level <br /> Chlorine—primary disinfectant <br /> Hydrafluorosi]icic Acid—reduces toath decay <br /> Lirne—water softening agent <br /> Sodium Chloride—assists ta remave nitrate from water <br /> Sodium Chlorite—disinfectant; used for taste and odor contral <br /> Sodium Hexametaphasphate — used ta counteract ca]cium hydroxide; prevents scaling; filter <br /> protectian <br /> The City of Decatur uses 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 /> Perfarmance Solutions af Jacksonvitle, FL} to evaluate product performance, Vendors submitted <br /> products for evaluation. <br /> Each product was evaluated and assigned a performance factor based on its ability to remove 60% of one <br /> of the mast commonly occurring substances attributed ta the unpleasant taste and ador characteristics of <br /> drinking water- Geosrnin. <br />