C150402 CT2015-090 Approval Letter

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Ephraim Ditch Company Agenda Item 32c May 9,2014(Updated May 23,2014) Page 3 of 4 Water Rights The water rights impacted by this project are shown in Table 1: TABLE 1: EPHRAIM DITCH COMPANY WATER RIGHTS IDecreed Name Amount(CFS) Appropriation Date Adjudication Date Ephraim Ditch 47.0 03/28/1881 10/22/1883 Average annual surface diversions of the Company over the past 10 years are 4,100 AF (0.08 AF per share). The Company also owns five irrigation wells completed in the confined aquifer that are used as a supplemental source of irrigation water for its shareholders. Use of these wells to supplement surface water will become more restrictive and expensive with the implementation of Ground Water Use Rules and sub-districts within Division 3. Project Description The purpose of this Project is to address the need for a well-designed diversion structure that will reduce maintenance, improve water management efficiencies, and allow for the accurate control of. compact-entitled waters. The core of the Ephraim Ditch diversion structure has been washed away over time, contributing to decades of limited diversion to irrigators and potential over payment to the Compact. Currently, irrigators divert their water right by piling debris such as tree trunks or cinderblocks to act as the diversion dam. The Project, in conjunction with the District's CMP, seeks to eliminate this practice. Alternative 1 -No Action: Due to the deteriorated rock and rubble diversion structure, this alternative was not considered further. The ability to divert the Company's water rights will become more diminished as the already deteriorated structure continues to deteriorate. It is not feasible for the Company to rely on its irrigation wells to make up for its surface rights. Alternative 2—Repair Existing Structure: The existing rock and rubble piles of debris offer no possibility of repair. This alternative was not considered further. Selected Alternative 3—Remove and Replace All Existing Structures:This alternative will remove and replace the diversion and headgate structures. The new headgate will be automated and five gauging stations will be installed. Additionally, measurement structures and telemetry will be installed at five locations within the ditch to accomplish water management efficiency goals. This alternative meets the Project's goals and has an estimated cost of$201,500 as shown in Table 2. TABLE 2: PROJECT COST SUMMARY Task CMP Cost Ephraim's Project Cost Engineering and Administration $91,000 $32,000 Construction $480,000 $164,000 Telecommunications $11,000 $5,500 Total $582,000 $201,500 Schedule: Final design is scheduled to be completed in summer 2014, with construction expected to start around July 2015. Construction is expected to be completed by December 2015.