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2015-08-31_PERMIT FILE - C1981010A (16)
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2015-08-31_PERMIT FILE - C1981010A (16)
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Last modified
9/14/2016 10:35:39 AM
Creation date
10/9/2015 9:36:54 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010A
IBM Index Class Name
Permit File
Doc Date
8/31/2015
Doc Name
page 4-172 to 4-222z
Section_Exhibit Name
4.8 Hydrologic Impacts
Media Type
D
Archive
Yes
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Table 4.8-1 Water Depletion Calculation <br />Revised (January 2013 PR -7) Estimate of Annual Use and Evaporative <br />Loss of Surface Waters Discharged From Trapper Mine <br />Evaporative Depletion From Impoundments <br />o Assume annual evaporative loss is 24 inches. <br />0 41 existing sediment ponds average 0.66 acres <br />surface area at high water mark = 41 * 0.66 ac * 2' <br />o Coyote Dam @ high water mark = 1* 12.00 ac * 2' <br />o Future life -of -mine sediment ponds = ((4 * .68) + .40) ac * 2' <br />o Existing stock ponds (66) @ average 0.13 ac = 66 * 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 for road watering. <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 = 32.17 * 0.9 <br />Total Adjusted Depletion Due to Mining - 2012 Estimate (PR -07): <br />Total Adjusted Depletion Due to Mining -1995 Estimate (TR -67): <br />MAY 21 2013 <br />0.66 (35 ponds + MF#3+#1+EMF#1+EF#1+WH+D#1+HGEXu41 <br />54.12 ac -ft <br />24.00 ac -ft <br />6.24 ac -ft <br />17 16 ac -ft <br />10.66 ac -ft <br />Total = 112.18 ac -ft <br />Total = 115.25 ac -ft <br />Total Estimated Depletion = 112.18 ac -ft <br />115.25 ac -ft <br />227.43 ac -ft <br />4-172a <br />34.62 ac -ft <br />32.71 ac -ft <br />Total Augmentation = 67.33 ac -ft <br />227.43 ac -ft <br />-67.33 ac -ft <br />160.10 ac -ft <br />130.39 ac -ft <br />' ,)ec us , <br />
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