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Feasibility Evaluation of the Arkansas Valley Pipeline <br />Water Works! Committee <br />July 2003 <br />necessary pipeline appurtenances, and 16 million gallons of reinforced concrete water storage <br />tanks located along the alignment. When costs for water treatment plant construction, plus <br />operation and maintenance costs for all facilities are included, the estimated Net Present Value of <br />the proposed Arkansas Valley Pipeline project is approximately $235 million. <br />Water Treatment Evaluations and Project Cost Estimates <br />The Arkansas Valley Pipeline could be configured to deliver either raw or treated water. <br />A variety of factors will influence the decision-making on which type of water to be delivered, <br />including: <br />• Capital and operation and maintenance cost differences between the two types of <br />systems. <br />• Preferences of the individual water supply entities for treated water versus raw water. <br />• Issues of local versus regional control of the water treatment element of water supply <br />operations. <br />There are three basic options available for water delivery to entities in the Lower Basin: <br />Option 1 - Water is treated at a conventional filtration plant at the upstream end of the <br />Arkansas Valley Pipeline so that treated water is delivered to all end users. This system <br />also would allow entities currently using groundwater of good quality and/or treated <br />surface water to blend local supplies with Arkansas Valley Pipeline supplies. <br />2. Option 2 -Raw water is delivered and treated at local treatment facilities. This would <br />allow entities to blend raw water from local sources with Arkansas Valley Pipeline <br />supplies prior to treatment. <br />3. Option 3 - A "No-Action" alternative in which the water suppliers downstream from <br />Pueblo would continue to utilize their existing sources of supply, but would upgrade their <br />existing water treatment plants and facilities to meet new standards, primarily the <br />radioactivity MCLs. <br />Advantages of an upstream central water treatment plant (Option 1) include: expected lower <br />costs per unit of water treated due to economics of scale and easier maintenance and <br />administration of treatment operations. Potential disadvantages include: loss of local water <br />supplier control; the likely need for additions of disinfectants in the pipeline at intermediate <br />locations to maintain quality; and the need fora "high-end" conduit system to protect water <br />quality. (A raw water delivery system might be built to lesser standards because treatment is <br />provided at the points of end use so that leakage into the pipeline would be of lesser concern.) A <br />GEI Consultants, IIIC. Ot 284 03-07-21 feasibilty report executive summary <br />