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t) . . . Little Thompson Water District ~ Proposed Dry Creek Reservoir September 13-14, 2005 Agenda Item 12a Feasibility Studies The L TWD, through their engineer Boyle Engineering Corporation, has completed a supplemental feasibility study in accordance with CWCS guidelines. The study includes the Districts' rationale for changing the project scope, a description of the changes, a revised cost estimate and financial analysis. The original study was completed by Smith Geotechnical Engineering Consultants. The supplemental study does not contemplate a significant change in demand between the original feasibility study and the new one, but reflects the Districts' current thinking on system reliability and drought response. Little Thompson Water District The L TWD was formed as a Special District in 1960 and began serving domestic water in 1962. As a Special District, L TWD is legally able to levy taxes, however, they have never levied taxes in their history and do not have plans to do so in the future, in order to protect their enterprise status. In 1993, the Board of Directors adopted a resolution establishing L TWD as an enterprise, and therefore they are not affected by the Tabor Amendment. The assessed valuation of the District in 2005 is $374,677,521. L TWD does have a CWCB approved Water Conservation Plan fulfilling all requirements of Sec. 37-60-126, C.R.S. L TWD provides domestic water to a 300-square mile area in Larimer, Weld, and Boulder counties, and are generally bounded by the City of Loveland on the north; Long's Peak Water District on the south; the City of Greeley, the South Platte River, and the St. Vrain River on the east; and the foothills of the Front Range on the west. L TWD currently serves approximately 7990 active taps providing water to approximately 24,500 customers. The following entities are serviced in whole or in part by L TWD: the Town of Mead, Longs Peak Water District, North Carter Lake Water District, the City of Loveland (less than 2%), the Town of Berthoud (emergency only), and the Town of Milliken (emergency only). Of the 7990 taps currently serviced by L TWD, approximately 1630 are in the Town of Mead and unincorporated Boulder County, both considered high household income. Other taps are located in areas considered middle household income. Current tap fees are $26,300. L TWD and CWCWD jointly own and operate two water treatment plants located at the south end of Carter Lake. The treatment plants are operated as a separate entity known as the Carter Lake Filter Plant, and are capable of delivering up to 34 million gallons per day (MGD) of treated water. A new treatment plant is currently under construction that would increase capacity to 50 MGD. Treated water is stored in the clear well at each of the filter plants as well as in a one million-gallon tank and two five million-gallon tanks near the filter plants. In addition to this storage capacity that is shared with CWCWD, L TWD operates three additional treated water storage facilities with a total storage capacity of 7.15 million gallons. L TWD's distribution system is made up of more than 500 miles of water lines ranging in size from one-inch to 42 inches in diameter. Water Riqhts Water used by L TWD is C-BT water delivered to Carter Lake. They own 9,496 shares, with 4964 of the shares converted to a fixed yield at 70%, and the remaining shares on the variable allotment. Proiect Description The dam will be a homogeneous earthfill embankment with chimney, blanket, and toe drains; riprap protection on the upstream face; and a key trench tying the structure into the foundation bedrock. A roller-compacted-concrete (RCC) spillway will be constructed to the right (looking downstream) of the highest part of the dam. The dam will be classified as a Class I Dam by the State Engineer's Office (SEa), and the spillway will be required to convey 100-percent of the Probable Maximum Page 3 of 6