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West Elk Mine <br />• <br />10, <br />;,, T?1,lA 1 S <br />-A <br />3LUI1111Q114A+u 111 1 fiviv i <br />Table 15 <br />Basin H drolo ical Characteristics <br />Basin Mean Peak Flood Flow (cfs) (3) Mean Annual Sediment Yield <br />Number Area Annual <br /> Runoff (Z) <br /> (acres) (s mi) (AcFt) (2 r) . (10 r) (100 r) AcFt Tons Cu yds <br />5 191 0.30 142 4.2 8.6 13.5 0.009 13.73 14.52 <br />6 96 0.15 71 2.1 4.3 6.8 0.005 7.63 8.07 <br />26 224 (5.35 166 4.9 10.0 15.8 0.011 16.78 74 <br />1 <br />27 102 0.16 76 2.2 4.6 7.2 0.005 7.63 . <br />8.07 <br />28 96 0.15 71 2.1 4.3 6.8 0.005 7.63 8.07 <br />29 224 0.35 166 4.9 10.0 15.8 0.011 16.78 17.74 <br />30 96 0.15 71 2.1 4.3 6.8 0.005 7.63 8.07 <br />31 90 0.14 67 2.0 4.0 6.3 0.004 6.10 6.45 <br />32 608 0.95 451 13.3 27.2 42.9 0.029 44.23 46.78 <br />33 109 0.17 81 2.4 4.9 7.7 0.005 7.63 8.07 <br />35 2,944 4.60 2,185 64.0 131.3 207.0 0.138 210.45 222.59 <br />36 1,184 1.85 879 25.8 52.9 83.5 0.056 85.40 90.33 <br />(1) Refer to Figure 1 for basin numbers and locations in Exhibit 55A. <br />(2) Based on "Water Balance Analysis of Horse and Lick Creek" Table 24 by Woodward-Clyde Consultants. <br />(3) Flood frequency based on Figure 2, Regional Flood Frequency Curves in Exhibit 55A. <br />4 Sediment yields derived b Ernest Pemberton of Wright Water Engineers based on regional sediment yields. <br />Springs <br />Table 16 summarizes the baseline flow data for springs in the permit area, defines the basins in <br />which the springs are located, and gives the likely sources from which the springs emerge. <br />Table 16 <br />Location, Flow, and Overburden Thickness for Springs in the Permit Area <br /> <br />Spring <br />Basin <br />Flow Range (gpm) <br />Source Overburden <br />Thickness Overburden <br />Thickness <br /> Spring Fall (feet from B- <br />Seam Mining) (feet from E- <br />Seam Mining) <br />Apache Rocks <br />15-1 Tributary to North <br />Fork <br />1125 <br />B <br />600 <br />--- <br />15-2 Tributary to North <br />Fork 0.47 Trickle C 600 --- <br />26-1 Dee Creek 22.5 0.10 B 1000 --- <br />28-1 Lower Dry Fork A 1200 1000 <br />D-2 Lower D Fork 1.5-9.4 D -See 1200 1000 <br />E15-3 Tributary to North <br />Fork Dan p Dry A/C 500 --- <br />G-3 Lower Dry Fork Cry-4 D 1000 800 <br />G-5 <br />J-10 Lower D Fork <br />Lower D Fork Dr -1 <br />7.5-8.7 D <br />Seep-7.5 <br />B 1000 <br />500 800 <br />300 <br />J-11 Lower D Fork D 900 700 <br />J-4 Lower D Fork 7.5-30 Dry-2.6 800 600 <br />2.04-101 Revised A'ovember 2003 PR10; Rev. Apri12006 PRIO; Sep. 2007 PR12; Feb. 2008 PR12