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ti <br /> COUNCIL COMMUNICATION FORM <br /> PURCHASING& INTERNAL SERVICES MEMORANDUM <br /> #07-09 <br /> March 12, 2007 <br /> TO: Honorable Mayor Osborne and City Council <br /> FROM: Steve Ga , ity Manager <br /> Ron Neuf , inancial Management Director <br /> Deborah M. P rry, Purchasing Supervisor��-� <br /> SUBJECT: Bids for water treatment chemicals <br /> SUMMARY RECOMMENDATION: Staff recommends awarding contract to the low <br /> bidders listed on Exhibit A for each of the water treatment chemicals for May 1, 2007 —Apri130, <br /> 2008. <br /> BACKGROUND: The following is a list of 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 <br /> Carbon Dioxide - lowers 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 /> Sodium Bisulfite - removes chlorine <br /> Sodium Chloride -pulls nitrate from water <br /> Sodium Chlorite - disinfectant; used for taste & 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 /> POTENTIAL OBJECTION: None I <br />