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<br />Alternative Evaluation and Recommendation <br /> <br />Using the evaluation criteria of cost, reliability, and system operation, we recommend <br />constructing an elevated water tower at the Centerville Public Works site. <br /> <br />, I <br /> <br />Elevated storage offers more benefits to the overall water system for approximately the same <br />life cycle cost as ground storage. Even with standby pumps and generators, a ground storage <br />system is less reliable than elevated storage. Elevated reservoirs act as buffers on a water <br />system to smooth the pressure fluctuations caused by pumps turning on and off. <br /> <br />Perhaps the most significant consideration of water system operation is the fact that the <br />system benefits the most from a reservoir by providing balanced pressure on the system and <br />control for well pumping. This is the most important argument a!!ainst choosing the ground <br />storage and booster station facility. Right now, the City has only one tank. Although the <br />existing tank is still operational, repainting of the tank is needed and the cost to repaint are <br />more than the cost of making the new tower 500,000 gallon capacity rather than 400,000 <br />gallons. The old tank could be left unused and dry, as this would decrease corrosion. When <br />maintenance is required on the new tank, the old tank could be disinfected and put back into <br />service as a backup. However, with the interconnection to the Lino Lakes water system, the <br />Centerville system could be fed from Lino Lakes during times when the new tower is out of <br />service for maintenance or an emergency. Therefore, the existing 100,000 gallon tower <br />could be demolished and removed if the City so chooses. The removal of the existing tower <br />would take only a week or so of demolition construction and it is estimated to cost <br />approximately $15,000 to remove. The new tower high water level is recommended to be <br />raised 6.5 feet from the old tower to match the elevation of the Lino Lakes water towers. By <br />raising the tower to match Lino Lakes water towers, the two systems will be compatible and <br />can be used in conjunction effectively without loss of storage by either system. This raising <br />of the tank, however, will make using the existing 100,000 gallon water tower and the <br />proposed water tower in conjunction ineffective. <br /> <br />r I <br /> <br />I I <br /> <br />\ . <br /> <br />Water Tower Feasibility Report <br /> <br />13 <br />