C150209 Approval Letter 2 - Laserfiche WebLink

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Central Weld County Water District - Proposed Dry Creek Reservoir September 13-14, 2005 Agenda Item 12b Feasibilitv Studies The CWCWD, through their engineer Boyle Engineering Corporation, has completed a supplemental feasibility study in accordance with CWCB 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. Central Weld County Water District The CWCWD was organized as a Special District (Title! 32) in 1965 and began serving customers in 1967. It operates as an enterprise fund and does not currently levy taxes, and therefore is not affected by the Tabor Amendment. CWCWD does have the power to levy taxes, and the 2005 assessed valuation is $563,930,000. CWCWD provides water to a 250-square mile area in Weld County, and is generally bounded by Greeley on the north; the Tri-Cities area of Dacono, Firestone, and Frederick on the south; 1-25 on the west; and Kersl3Y and Hardin on the east. CWCWD delivers approximately 1.5 billion gallons per year to its 40,000 customers. The following entities are served in whole or in part by CWCWD: the Towns of Kersey, LaSalle, Milliken (approx. 50%), Gilcrest, Firestone, Frederick, Dacono, and Platteville, Of the 11,400 taps, about 4730 are in Firestone and Frederick, both of which are classified as high household income, and the remaining taps are in areas classified as middle income. Their current tap fees are $16,100, and in 2004 CWCWD had approximately $6.2 million in tap fee revenue. CWCWD does have a CWCB approved Water Conservation Plan, fulfilling all requirements of Sec. 37-60-126, C.R.S. L TWO 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 sE~parate 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. A high pressure transmission main transports water from the filter plant east approximately 22 miles to CWCWD's distribution system. CWCWD's distribution system is made up of approximately 400 miles of waterline. Water Riahts CWCWD owns 4667 shares of C-BT water which is delivered to Carter Lake. Proiect Description The proposed 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 (ReC) 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 (SED), and the spillway will be required to convey 1 OO-percent of the Probable Maximum Precipitation (PMP) storm event. The spillway will consist of a two-cycle labyrinth weir with width of 41 feet and maximum discharge of 2,266 cfs. Water will be delivered to the proposed reservoir by gravity and returned to the CLFP by pumping through an existing pipeline. The raw water transmission system consists of the pump station; a 359-foot-long, 24-inch steel waterline between the dam outlet and the pump station; a 6,524-foot-long, 24-inch ductile iron pipeline to connect the pump station to the existing 20-inch pipeline owned by the CWCWD at the northwest side of the reservoir. Page 3 of 6