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I I I I I I I I I I I I I I I I I I I III. PLAN OF DEVELOPMENT A. Introduction In 1981, Rocky Mountain Consultants, Inc. completed a preliminary feasibility study of 5 potential reservoir sites for the City of Louisville. These sites included: 1) renovation of the Louisville Reservoir, 2) expansion of Harper Lake, 3) the Flatiron Reservoir site located west of Manhattan Drive and immediately south of U.S. Hi9hway 36, 4) the Gravel Pit Reservoir site located approximately 1,000 feet southwest of Harper Lake and 5) the Butterfly Reservoir site located approximately 2 miles east of the Town of Erie, Colorado. The recommendation of the study was that an expanded facility be built at Harper Lake. The proposed facility would have a storage capacity of 665 acre-feet with a surface area of 40 acres. In addition, the study recommended that a toe drain and other remedial improvements to Louisville Reservoir should be completed in as timely a manner as possible, since such construction would be required under each alternate at the Louisville Reservoir site. Based on the results of the 1981 study, the City of Louisville retained Rocky Mountain Consultants, Inc. to conduct a more detailed feasibility study of three of the alternate sites which included the Louisville Reservoir renovation, Harper Lake expansion, and construction of a reservoir facility at the Gravel Pit site. At the request of the Colorado Water Conservation Board, an alternative site on South Boulder Creek near Eldorado Sprin9s was evaluated. This study evaluates seven alternative configurations described as follows: 1. Louisville Reservoir Expansion - Expansion of Louisville Reservoir to a capacity of 305 acre-feet which basically corresponds to the Louisville Reservoir Alternate A described in the Rocky Mountain Consultants, Inc. report of 1981. 2. Gravel Pit Alternate - Construction of a 108 acre-foot storage site at the 29