2009-10-30_PERMIT FILE - C1982056 (8)

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• E51-7 Underground Mine Water Balance -Future Years ~ vase t -some eastern ana rvortnern mnow ulvertea to n5 sum p aver sump uewaterea WaterYear 1999 2001.1 2001.1 2002 2005 2010 2014 Units 115 -Fish Creek WMD Ib> m 55 55 55 55 55 55 55 umhos/cm 2900 2900 2900 2900 2900 2900 2900 Water in Stora a allons 4.81 E+08 2.10E+08 2.10E+08 2.10E+OS 2.10E+08 2.10E+08 2.10E+08 umhos/cm 7300 6600 6600 5200 3800 3800 3800 Avera a Dischar e m 300 300 300 300 300 300 300 umhos/cm 7300 6600 6600 5200 3800 3800 3800 109-Portal North Mains la) m 45 45 45 45 45 45 45 umhos/cm 2900 2900 2900 2900 2900 2900 2900 EMD ~`I m 85 85 85 85 85 85 85 umhos/cm 2900 2900 2900 2900 2900 2900 2900 6 Ri ht m 200 200 200 200 200 200 200 umhos/cm 4700 4700 4700 4700 4700 4700 4700 Waters ra s Coal roduction ton/ r 8,000,000 8,000,000 8,000,000 8,000,000 8,000,000 8,000,000 8,000,000 Usa eldl m 167 167 167 167 167 167 167 Loss to coal lel m 55 55 55 55 55 55 55 Rec cled m 100 100 100 100 100 100 100 Net Added m 12 12 12 12 12 12 12 umhos/cm 2900 2900 2900 2900 2900 2900 2900 NMD &NWMD "I m 30 30 40 100 190 270 umhos/cm 2000 2000 2000 2000 2000 2000 Diverted to 115 sum m 245 245 245 245 245 Avera a Dischar e m 342 372 127 137 197 287 367 umhos/cm 4000 3800 3800 3700 3500 3300 3100 Notes a) Estimated from Annual Mine Inflow Surveys. b) Based upon Annual Mine Inflow Studies c) Estimated from Annual Mine Inflow Survey and area mined. Mining rate is approximately 700 acres and yield is estimated to be 0.027 gpmlac (see text) d) 1998 usage was 208 gpm at 7,900,000 tons per year, future years pro-rated by production rate e) Water addetl to coal by sprays estimated from difference between equilibrium and as shipped moistures (1.5%) f) Estimated from area to be mined. Mining rate is approximately 700 acres and yield is estimated to be 0.027 gpm/ac (see text) g) Water Quality Sources (values rounded to significant figures) WMD: Average of groundwater inflows from WMD and North Main, 1994 Mine Inflow Study Water in Storage: Sample from 115 taken 10/27/98 North Mains: Average of groundwater inflows from WMD and North Main, 1994 Mine Inflow Study EMD: Taken from average of EMD inflow, 1997 Mine Inflow Study Water Sprays: Average for Pond A water (source of underground makeup water, taken from 1997 AHR 6 Right: Water sample collected 3/30/99 NMD &NWMD: Estimated; since they are much further from outcrop, they will be more influenced by the water quality from the Wadge Overburden that has not been affected by spoils Taor-ss Table E51-7 04/02/07