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,� , <br /> COUNCIL COMMUNICATION FORM <br /> PURCHASING& INTERNAL SERVICES MEMORANDUM <br /> #03 - 12 <br /> March 7, 2003 <br /> TO: Honorable Mayor Howley and City Council <br /> FROM: Steve Garman, City Manager <br /> Beth Couter, Financial Management Director <br /> Deborah M. Perry,Purchasing Supervisor� <br /> SUBJECT: Bids for water treatment chemicals <br /> SUMMARY RECOMMENDATION: Staff recommends awarding contracts to the bidders <br /> listed on Eachibit A for each of the water treatment chemicals for May 1, 2003 -Apri130, 2005. <br /> BACKGROUND: The chemicals in this bid are for the water purification process at the South <br /> Water Treatment Plant and the new nitrate facility. <br /> The following is a list of chemicals and how they are used in the water purification process: <br /> Alum -to coagulate; clarifying agent <br /> Carbon -used for taste and odor control; control of atrazine <br /> Carbon Dioxide - lower the pH level; due to lime <br /> Chlorine - disinfectant; required by law <br /> Hydrofluosilicic Acid -reduces cavities; required by law <br /> Lime - softening agent <br /> Polymer - used as coagulant; lowers turbidity <br /> Potassium Permanganate - used for taste and odor control <br /> Sodium Bisulfite -removes chlorine <br /> Sodium Chloride -pulls nitrate from water <br /> Sodium Chlorite - disinfectant; used for taste and odor control <br /> Sodium Hexametaphosphate -used to counteract lime; prevents scaling; filter protection <br /> Sodium Hydroxide - increases alkalinity to meet lead and copper rule <br />