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• Revised (October 1998) Estimate of Annual Use and Evaporative <br />Loss of Surtace Waters Discharged From Trapper Mine <br />Evaporative Depletion From Impoundments <br />o Assume annual evaporative loss is 24 inches. <br />0 35 existing sediment ponds average 0.67 acres <br />suAace area at high water mark = 35 •0.67 ac • 2' <br />o Coyote Dam ~ high water mark = 1. 12.00 ac • 2' <br />o Future life-of-mine sediment ponds = 11 •0.68 ac • 2' <br />o Existing stack ponds (59) @ average 0.13 ac = 59.0.13 ac • 2' <br />o Future life-of-mine stock ponds (41) = 41 • 0.13 ac • 2' <br />Depletion Due to Road Watering <br />o Average annual quantity used far road watering. <br />= 46.90 ac-ft <br />= 24.00 ac-ft <br />= 14.96 ac-R <br />= 15.34 ac-R <br />= 10.66 ac-ft <br />Total = 111.86 ac-ft <br />Total = 76.46 ao-ft <br />Total Estimated Depletion = 111.86 ac-ft <br />76.46 ac-ft <br />• <br />Augmentation Due to Deep Wells/Pit Pumpage <br />o Assume 10% of pit water originates from surface runoff. <br />o Average annual Trapper well dewatering. <br />o Average annual Trapper pit dewatering = 46.27.0.9 <br />Total Augmentation = <br />Total Adjusted Depletion Due to Mining -1998 Estimate (TRIO): <br />Total Adjusted Depletion Due to Mining -1995 Estimate (TRI>7): <br />r~ <br />L J <br />G:VC4RLIDEPLETE.XLS <br />1-59b <br />186.32 ac-ft <br />32.06 ac-ft <br />41.64 ac-R <br />73.70 ac-ft <br />188.32 ac-R <br />-73.70 ac-ft <br />114.62 ac-ft <br />130.39 ao-ft <br />Revision: T.e-6'o <br />Approved:' <br />Nav <br />