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<br />CDM <br /> <br />Section 4 <br />Proposed Facilities <br /> <br />4.1 Cost Potential Facility Needs <br /> <br />Background <br />As discussed in Section 2.5, Castle Pines North has initiated an IWRP to study <br />groundwater supplies and to develop renewable surface water supply alternatives. <br />Preliminary results from the groundwater study show that if the basin continues to <br />experience withdrawals of magnitude currently experienced, groundwater levels <br />underlying the District's service area will continue to decline regardless of the <br />District's pumping activities. The timing of when the District would need to add <br />additional wells to compensate for reduction in well yields is uncertain at this time <br />but is estimated to be within approximately 20 years. Although the timing of new <br />wells is uncertain, the District's need for additional wells within a reasonable <br />planning horizon is a certainty. <br /> <br />Throughout Colorado the competition and expense of water is increasing. The District <br />aims to acquire a sustainable and renewable source of water before the water becomes <br />too expensive. This would consist of a combination of reuse, conservation, and surface <br />water supplies. Given the complexity and dynamic nature of the water market, a <br />single water supply alternative may not best meet future needs. The IWRP will <br />provide an action plan and decision framework for the District to acquire renewable <br />supplies. A variety of water supply alternatives will be proposed enabling the District <br />to make an informed decision and to develop an implementation plan <br /> <br />It currently is not possible to conclusively describe the District's long-term water <br />supply plans. The following discussion qualitatively describes possible water supply <br />alternatives that are being developed through the development of the IWRP. <br /> <br />Surface Water Supply Alternatives Evaluated in the IWRP <br /> <br />Surface water supplies may be acquired through the acquisition of water rights from <br />the upper or middle South Platte River system and from treated wastewater return <br />flow credits. Figure 4-1 shows the infrastructure that may be constructed to facilitate a <br />new surface water supply. The District has applied for 540 AF of storage in Chatfield <br />Reservoir as part of the reallocation effort and may contract for 3,000- to 4,000 AF of <br />storage in Rueter Hess Reservoir. These two reservoirs could serve as the primary <br />means of storage. A pipeline from Chatfield to Rueter Hess Reservoir would convey <br />water acquired through upper South Platte River rights or return flow credits <br />discharged into East Plum Creek flowing into Chatfield to Rueter Hess for storage. <br />Water acquired from middle South Platte water rights could be conveyed through the <br />East Cherry Creek Valley or Aurora pipelines to Rueter Hess. <br /> <br />4-1 <br /> <br />O:\Castle_Pines_North\Conservation Plan\Drafts Submitted For Review\Final Conservation Plan.doc <br />