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I I I I I I I I I I I I I I I I I I I FEASIBILITY STUDY OF TERRACE RESERVOIR OUTLET IMPROVEMENTS 1.0 Introduction Terrace Irrigation Company, located in Conejos County, Colorado provides irrigation water for the benefit of the shareholders downstream of Terrace Reservoir. The outlet works of the reservoir requires repair due to damage caused by debris and sediment that accumulated in the reservoir as a result of flooding upstream of the reservoir and erosion at the Summitville Superfund site. The trash rack has been destroyed and must be replaced, the outlet tunnel needs to be cleaned, and one of the gate valves needs to be repaired. The damage caused by flooding has caused an emergency situation for the Terrace Irrigation Company whereby the reservoir outlet could become inoperable and uncontrolled storage could occur. The work on the outlet structure must be completed as soon as possible to allow Terrace Irrigation Company to pass spring runoff through the reservoir and store water in the Reservoir to serve their share holders during the upcoming irrigation season. 2.0 Project Sponsor Terrace Irrigation Company is a mutual irrigation company and a non-profit organization registered in the State of Colorado. There are 27 shareholders and 831 &7/8 shares of stock. Terrace Irrigation Company has the power to levy assessments for all lawful purposes, the power to cut off water deliveries to shareholders that fail to pay their assessments, and the power to offer stock for sale to pay back assessments. The articles of incorporation and by-laws are included in Appendix A. 3.0 Project Service Area and Facilities The By-Laws for Terrace Irrigation Company state that one share of stock is issued for every 16 acres owned by a member. With 831 & 7/8 shares, this tabulates to 13,310- acres of service area in Conejos County and Rio Grande County, Colorado. The company diverts their water supply through the Terrace Main and Alamosa Creek Canals. From Division of Water Resource records, the GIS service area is listed as 6,148.6 acres for the Terrace Main Canal and 4,207.6 acres for the Alamosa Creek Canal for a combined total of 10,356.2 acres of s~rvice area. The sources of the provided irrigation water are the tributaries of the Alamosa River upstream of Terrace Reservoir which is located on the Alamosa River. Irrigated acreage within the service area is primarily used for cattle ranching, to grow grain and to grow hay. The hay crop and grain is used as cattle feed and may be sold. A map of the project service area is included in Appendix F. Terrace Irrigation Company Outlet Works Feasibility Study February 2004 Page 6 of 10