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Selected Alternative I I I I I ,I I 'I I I J I I I I I I I I In view of the above discussion, alternative 3, reconstruction, is recommended as the most feasible and most cost-effective of the options available. This alternative is the least-cost and the fastest track alternative in terms of overall investment. Additionally, the details of the reconstruction have been discussed at a public meeting of the St. V rain Water Users Association in September, 1996. Construction will take place during the low flow period in the last half of 1996 and early 1997. Impacts and Permitting For the recommended reconstruction alternative, the U.S. Army Corps of Engineers has . agreed to a national 404 permit for the work. The dam structure would be less than the regulatory ten (10) feet in height, therefore exempt from regulatory control by the state. Some input from the Colorado Division of Wildlife (fisheries) and the U.S. Fish and Wildlife Service (USFWS) may be necessary, but this should be minimal since a structure has existed at the site for many years. Impacts on the narrow floodplain in the canyon due to flood waters would be relatively unchanged. Some review by the Colorado State Division of Highways prior to construction may be required to address construction traffic control and structural safety concerns. No environmental assessment (EA) is anticipated for the proposed alternative. Conceptual Review by the CWCB The project has had an informal review by the Colorado Water Conservation Board (CWCB), It has received preliminary approval for inclusion on the list to receive project funding. As one condition of this approval, the Town shall install a stilling well at the structure site to enable flow measurement. This capability is included in the design effort. Conceptual Cost of the Proposed Proiect A conceptual cost of the recommended reconstruction was developed. The cost is called an order-oj-magnitude estimate and is conceptual because it is generated from cost data on similar projects, without benefit of fixed scope or preliminary design. Conceptual cost estimates generally have an expected accuracy of + 50% to -30%, The estimate of cost is shown in Table 3. Financial Impacts and Considerations Regarding general background of the water user population, the community is in a growth cycle. Several new subdivisions are under development as noted in Chapter 2. Mean household income (MHI) in the Lyons service area, as determined by the U, S. Census Bureau, was $25,625 in 1989, This may rise since the price of housing is rising rapidly. In 1990, 101 of 1223 persons, about 8,3 percent, were determined to be below the poverty level. Current cost of water and sewer service are below rates in some local communities, The