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STATE OF COLORADO <br />OFFICE OF THE STATE ENGINEER of cow <br />Division of Water Resources <br />Department of Natural Resources ~ e '~~ <br />y <br />1313 Sherman Street, Room 878 ~ ~ ~ <br />~ <br />r <br />Denver, Colorado 80203 ~ <br />`1a7b ~ <br />Phone (303) 866-3581 ~ JUI 1 ~ <br />2003 <br />y <br />FAX (303) 866-3589 , ~°" <br />= <br />www.water.state.co. us <br />RECEIVED <br />o~ <br />Greg E. Walther <br />1UL 1 0 2003 Enecutive Director <br />Ms. Cheryl Signs Hal o. simpson, eE. <br />State Engineer <br />Cheryl Signs Engineering Division of Minerals and Geology <br />109 East Fourth Avenue <br />Denver, CO 80203 / <br />Re: Substitute Water Supply Plan, Durham Pit (DMG #M-78-056) C/ass: /7~/L~Yo/oq ~/ <br />Sections 3, 9 and 10, T5N, R65W, 6th P.M. / ~1/ <br />Water Division 1, Water District 3, Weld County <br />Dear Ms. Signs: <br />This letter is in response to your application for a substitute water supply plan for the <br />Durham Pit. The required fee of $1,343 for the substitute water supply plan has been submitted. <br />The anticipated net depletion for this plan, based on the numbers provided in the <br />substitute water supply plan report, is 194.9 acre-feet per year. The currently exposed ground <br />water at the site totals 38.1 acres. However, the plan anticipates that a total of 79.2 acres of <br />water surface will be exposed at the site if dewatering ceases, therefore this plan will cover <br />replacements for depletions associated with the 79.2 acres. According to the information <br />submitted, 44.6 acres of water surface, out of a total of 123.8 acres to be exposed at the site, <br />was exposed within the reclamation permit boundary prior to January 1, 1981. You have <br />provided a monthly breakdown of the annual depletions made up of 184.30 acre-feet of net <br />evaporative loss, 7.8 acre-feet of water lost with the mined product (which re_ presents 267,931 <br />tons of mined product), and 2.8 acre-feet of water used for dust control. <br />Using to the State Engineer's General Guidelines for Substitute Supply Plans for Sand <br />and Gravel Pits, the State Engineer has determined the net depletion for this plan to be 222.99 <br />acre-feet for the 79.2 acres of water surface to be exposed at the site. Based on the above- <br />mentioned guidelines the net evaporation for the 79.2 acres was calculated as the difference <br />between gross evaporation and the effective precipitation, where the effective precipitation is <br />equal to 70% of the total precipitation. Therefore, for this plan no benefit was given for the total <br />precipitation but only for 70% of the total precipitation, which increased the annual evaporative <br />loss from 184.30 acre-feet to 212.39 acre-feet. A monthly breakdown of the annual depletions <br />made up of 212.39 acre-feet of net evaporative loss, 7.8 acre-feet of water lost with the mined <br />product (which represents 267,931 tons of mined product), and 2.8 acre-feet of water used for <br />dust control can be found on the attached table. Phreatophyte credits of 24.1 acre-feet per year <br />have been applied to this plan, which reduced the anticipated net depletions to 198.48 acre-feet <br />per year. <br />The proposed source of replacement for this pit is 98.1 acre-feet of historic stream <br />delivery from the dry-up of 33.7 acres of land historically irrigated with five shares of Greeley <br />Irrigation Company's interests in Greeley Canal No. 3 and Fossil Creek Reservoir diverted from <br />the Cache la Poudre River and previously used for irrigation of the mined property. The values <br />