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Y ~y~~°9y STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natu2l Resources 1313 Sherman Stree4 Room 818 Denver, Colorado 80203 Phone (303) 866-3581 May 10, 2004 FfJ( (303) 866-3589 vnvw.wa[ecstate.co. us RECEIVED Mr. Ray Dunn Bishop-Brogden Associates, Inc. MAY 1 1 2004 333 West Hampden Ave., Ste 1050 Englewood, CO 80110 Division of Minerals and Geology RE: Grisenti Farms Pit DMG File No. M-2001-005 Sec. 13, T19S, R69W, 6`h P.M. Water Division 2, Water District 12 pF' CO~ H •+ M rt ROB X t876 ~` B'df Owens Governor Russell George Executive Director Hal D. Simpson, P.E. State Engineer ~~~ ~~ Dear Mr. Dunn: We have reviewed your January 13, 2004 request for a substitute water supply plan on behalf of Castle Concrete Company. The required $1,343 fee has been received. A well permit application has been submitted, receipt no. 519831. This operation is estimated to last 5 years. An area of 35 acres will be mined exposing ground water. The pit will be dewatered into a 5 acre settling pond. The depletions of this operation consists of 15.2 acre-feet of evaporative loss from exposure of 5 acres of water, 4.9 acre-feet of water removed via 165,000 tons mined product (4% loss by weight), and 5.8 acre- foot pumped for dust suppression. A monthly breakdown of these amounts and their lagged affects on the Arkansas River is given on Table 1, attached. The pit will be located less than 100 feet from the Arkansas River, and so the depletions are considered to be instantaneous. The proposed source of replacement water is the dry-up of 40 of 97 acres of alfalfa historically irrigated with Lester Attebery Ditch water. 60 shares of Twin Lakes Reservoir water will cover the replacement water for the winter months. Should the dewatering of the pit cease, there is adequate replacement water to cover 40 acres of exposed ground water. The state and division engineers have reviewed the plan and the adequacy of each source of water provided for use as augmentation water, including, where necessary, the historical consumptive use of each water right, and return flows from diversion of waters imported into the Arkansas River Basin or other fully consumable waters proposed for use as augmentation water. In accordance with Section 25-8-202(7), C.R.S. and Senate Bill 89-181 Rules and Regulations adopted on February 4, 1992, the state engineer has determined that subject to the terms and conditions below, the replacement supply is of a quality to meet the requirements of use to senior appropriators. This substitute water supply plan is hereby approved pursuant to Section 37-90-137(11), C.R.S., subject to the following conditions: