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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 />C. WATER TREATMENT <br /> <br />Treatment Processes <br />It has been established that a conventional made rapid sand type plant is required (and <br />appropriate) to treat Bear Creek raw water for potable use. The basic process train includes: <br /> <br />. Addition of flocculent chemicals; also, possibly chemicals for pH/alkalinity adjustment to <br />produce a non-corrosive water. <br /> <br />. Rapid Mixing <br /> <br />. Flocculation <br /> <br />. Sedimentation <br /> <br />. Filtration using multi-media and, optiohally, a filter-aid polymer. <br /> <br />. Disinfection, primarily a chlorine residual. <br /> <br />In addition, because of the nature of the raw water, provisions should be made to control taste, <br />odor, and other trace organics. Such provisions could include ozonation, potassium <br />permanganate, or powdered activated carbof1 (PAC). This decision can be made as a part of <br />final plant design, and need not be resolved in the Master Plan. <br /> <br />Alternatives to be resolved during system Planning involve location and sizing of proposed <br />treatment facilities. Three altematives were formulated for analysis: <br /> <br />Alternative C-1. Retain the existing plant site and expand capacity there, eventually to <br />approximately 2.0 MGD. <br /> <br />Alternative C-2. Abandon the existing plant and construct a new plant below Cooley Reservoir. <br />The initial capacity would be 1.0 MGD, with provisions for expansion to 2.0 MGD. <br /> <br />Alternative C-3. Retain the existing plant and expand capacity to 1.0 MGD. In the future <br />construct a second plant below Cooley Reservoir as required to obtain ultimate required capacity. <br /> <br />The present plant was built with a minimal bUdget, and deficiencies have been acknowledged. <br /> <br />70-080.035:MSTR.PlN <br /> <br />11I-16 <br />