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Town of Frederick - Mllavec Lake Rehabilitation January 22-23, 2003 Agenda Item 19b fillings, particularly last year due to the shallow groundwater table related to the drought. In September 2002, the Town through Rocky Mountain Consultants (RMC), completed a Seepage Investigation Study, concentrating on reducing the transmissivity beneath the dam foundation. RMC performed field investigations to collect the geologic and geotechnical data necessary to evaluate the feasibility and cost of seepage reducing improvements, and evaluated the site's water balance in order to assess the potential effectivenes~ of the proposed alternatives. Feasibllltv Studies The Town, through its engineer RMC, has completed a feasibility study in accordance with CWCB guidelines. The study includes an assessment of alt~rnatives available for reservoir rehabilitation for seepage reduction. The Town of Frederick The Town of Frederick is situated in southwestern Weld County, between the towns of Firestone and Dacono, and was incorporated in 1907. It was <?riginally started as a coal mining camp. The current population is approximately 4000 residents, ~nd the Town serves about 1,600 domestic water taps and 100 commercial/industrial taps. The,Town projects to grow between 1,0 and 4,0% annually, (State projections for Weld County overall: show an annual growth rate of 3.2% through 2025.) The Town's Water Fund is operated as an enterprise fund. It is the opinion of the Town's attorney, as well as the Town auditor, that the TABqR amendment would not impact the funding or loan repayment for the proposed project. Water Riahts Milavec Lake is filled via the Lower Boulder Ditch and the Leyton Lateral. Lower Bou/der Extension Reservoir is the legal name for the storage decree that has historically been used to fill the lake. The decree has an appropriation date of 1892 and an adjudication date of 1907, in the amount of 768 acre-feet. In 1982, by agreement, the Town subordinated 221.5 acre-feet of storage to municipal users upstream, leaving a right of 546.5 a~re-feet under the original storage decree. The lake has historically been filled in late April and earl~ May under the storage decree. RMC estimate that the reliable yield of the storage right is 450 acretfeet. The Town is also in the process of investigating acquisition of additional direct flow righls to help fill the lake. Prolect Need In the most recent water year (Nov. 2001 to Oct. 2002), the Town's potable water usage was 1,001 acre.feet. Approximately 69 percent of average hou~ehold and town use occurs during the summer months (May to September) , and an estimated 750/d (more than 520 acre-feet) of the total summer usage is for lawn/park irrigation, . Milavec Lake storage will be used to irrigate at least 11 00 acres of predominantly grass-covered areas - Town parks, open space and trails, and school district athletic fields. The average annual water requirement for the areas to be irrigated is 300 acre-feet. The total water volume lost to lake evaporation will be approximately 130 acre-feet. Thus the currently projected average annual water use volume, plus the evaporative loss fromthe lake,jis within the 450 acre-feet projected to be available from Milavec Lake on an annual basis. ' Raw water irrigation will replace the current use of CWCWD water for irrigating some of the Town's public areas and parks. Currently, the Town pays $0,63 per thousand gallons for CWCWD to treat and deliver the Town's water. The estimated cost o~ pumping raw water from Mllavec Lake for irrigation is approximately $0.20 per thousand gallons including power, system operation and Page 2 of 6 " \ . . .