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The augmentation plan would require that tributary water be replaced if such water is called. From the calculations above, a maximum of 10.09 ecre-ft of water from non-tributary or other water rights would be required if called. Coors Energy Company has an nnnuel appropriation of 167 acre-ft between the two Laramie-Fox Hills aquifer wells. Even though one of these wells is unsuitable for most needs (except dust suppression) 167 acre-ft of water is still available to augment. However, the maximum production potential for the Laramie-Fox Hills well #1 is 8.62 ac-ft per month ar 103 acre-ft/year. To date, water has not been called and thus Coors Energy Company hea not had to release water to cover consumptive use of tributary water due to mine operations. The average consumptive use of tributary water at the Keenesburg Mine is approximately 1.65 acre-ft per month, with a maximum net use of 2.18 acre-ft during the month of June. The minimum consumptive use periods are during the winter months, and amounts to approximately .17 acre-ft per month. Coors Energy Company has the ability to produce enough water from the Laramie-Fox Hills well #1 to meet the needs of the mine while an augmentation plan is in effect. To date, there have been no measured detrimental effects to the • Ennis Drew sub-surface water system either in quantity and quality. The net amount of water used from Ennis Draw is approximately 2.56 ac-ft of water per year, <see table above). There are no wells in Ennis Draw that have been or are anticipated to be impacted by mining activities. 4.3 GENEkAL DATA 4.3.1 Site Deacriotion Weld County Sections 25,26 & 36 T 3 N, R 64 W. Half acre sites will vary according to where mining is taking place. Keenesburg Mine Box 359 Keenesburg, Colorado 80643 4.3.2 Aree Each site will be no more tha~l/21acre< Coors estimates 2 sites per year required end a mine life of 7 to 17 years for a total site acreage of 7 to 17 acres. G~ C/ ~~ J' -6-