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<br />I <br />I <br />I <br />,I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />ranged from 2 to 240.000 and fecal coliform bacteria per 100 ml <br />ranged from 2 to 33.000. The proposed treatment by the package <br />treatment plant followed by disinfection will destroy bacteria in <br />these ranges and produce a potable water which meets the required <br />quality standards without any unusual requirements. <br /> <br />WATER TREATMENT <br /> <br />Because of the high variability of turbidity and suspended solids <br />throughout the year, the raw water supply for the South Rifle Divi- <br />sion diverted directly from the Colorado River should be treated by <br />conventional means. The proposed package water treatment plant <br />process train would include: <br /> <br />. <br /> <br />Grit removal and pre-sedimentation <br /> <br />. <br /> <br />Chemical addition and rapid mix <br />Coagulation/flocculation <br />Sedimentation (if necessary) <br />Spare chemical addition (if necessary) <br />Disinfection (chlorination) <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Filtration <br /> <br />The chemicals required to provide an efficient coagulation, filtra- <br />tion and disinfection process are chlorine, liquid alum, cationic <br />polymer. nonionic polymer, spare chemicals as required for taste, <br />odor and color control. and caustic soda. <br /> <br />IV-16 <br />