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I 1 TABLE E51-25 -SIMPLIFIED WATER BALANCE EAR 20p] 2008 2009 2010 2011 2012 2013 PRODUCTION LEVEL MMTON$CLEAN 11.5 10.] 11.7 12.0 11.0 9.8 8.4 WATER BALANCE CATEGORY 5 stem In ate Macrr ra.~:,.«z' . _ '+. ~ ...- r.A "._ " a~'T-.-'it r3+z8U+~ w. ~S±Ye -.. . - Mine Inflows' (SOUthem antl Western Minin Disirigs 55/88.7 5588.7 55'88.] 55/88.7 55/88.7 55!88.] 55'88.7 - Mine InFlOws' Eastern Minin D'stdct 65/104.9 65/104.9 65/104.9 65/104.9 85'104.9 6&104.8 8&104.8 -Mina In0ows' INOrNem Mining O"satct- Includes SMN/6MN Intake Shafts 95153,2 95153.2 95/153.2 95153.2 9&153.2 95153.2 95153.2 - Mine Inlldws' (NOM Mains antl Portal) 70/16.1 10/18.1 10/18.1 10/16.1 10/18.1 10H 8.1 10/18.1 -Potable Water Well 4/6.8 4/8.8 4/6.8 d/6.8 4/8.8 4/6.8 416.8 - O erational Use From Pontl A •/183.8 '/163.fi •/163.6 '1163.6 •/183.6 9183.8 '/183.8 -$u lemental Water From ORSke t Ne li ible Ne li ible N li ibk Ne li ible Ne li iple N li ible N li ilNe Subtotal S stem In ub acre- r 533.3 533.3 533.3 533.3 533.3 533.3 533.3 S Mm Ou uh Madre- -Surface Moisture Coal Shi menis ° 184.6/2655 153.2/247.1 ifi7.5270.2 171.8271.1 15].5/254.0 13].5'221.8 120.5194.0 -Mine Ventilation Losses See Notes ~ 988.8 '/68.8 •/68.8 •/68.8 •/88.8 988.5 768.8 -Surface DUSt Contrd 11117.7 11/1].] 11/17.7 11/17.7 11/17.7 11/17.7 11/17.7 - Washtlown Water Pontl B '/3.8 '/3.8 •/3.8 '/3.8 '/3.8 '/3.8 93.8 PondC 'b.e '/0.6 90.6 '/0.8 •/0.6 '/0.6 'b.8 Pontl D 'b.5 'b.5 '/0.5 70.5 •/0.5 90.5 •I0.5 Pond E Y1.9 '/1.9 •/1.9 •/t.9 •H.9 '/1.9 •/1.9 -Eva ati°e Losses AN Active Ponds ° 714.0 Y14.0 Y14.0 914.0 914.0 '/14.0 714.0 Subtotal S stem Ou ub acre- 372.8 354.4 3TI.5 384.4 3131.3 329.1 301.3 Chan eld Store-e'aere- °pi°'~""' S'%,is<760:5: ?yEi78.9 d558'T 148:9 1. - m Notes: General -Inputs to Twenrymib Goal Companys (TCC) water system are prtmadty ground water inflows to the active mine wvMings. WRh the exception of tl19 system outputs Wended. all water is recycletl and reusetl wihin the mine water system. Asteliak tlenotes value not aveJable. ' -Due to the tlip of the coal seam, and the mining method (bngwall mining uptlip), grountl water inflow to Me active mine worNngs a1W minetl-out ereaa u generally intemaptetl by the active workings (cunenl ac9ve panel antl development waNngs) and remains relatiwty constant ~-TCC acCassionally has supplemental water Wcketl-in /ram o83ite [o meet specific ope2tbnal neetls. Thk tloes not occur kepuantly antl the guantitlas are not sgnificant ° -Surface moisture loss cakulaticn Cased on ZB of protluc8on passing through washplan6 with carpal of 3.7 percent surface moisture, antl remalnNg i7d of production at surace moisture of 2.0 percent - Maature bss occurs through mine ventilation tlue tc an increase in relaWe humitli[y as veniJaBOn air passes Nrough Ue mina. liven, however, that the increase h relative humitliry u due to evaporeton of ground water within Ora mine, the moisture loss tloes not represent a surface wafer depletion ° -Based on maximum (total) Pontl surface area of approrimatety 40.9 acres and average annual evaporation rates from NOM evaporalon maps ° -Given Nat all system inputs are recycletl, wim the aception of Ne iden6fietl system outputs (losses or tleple5ons), Ne tlifterence between inputs antl outputs represents a net change in system storege. Water u curtenty (2007) stored undergrountl in the SouNem antl Eastem Mining Disbicis (wpacay about 2,540 acre-ft), an above-grountl in either or both of the two million-gallon storage tanks and in Ne Area 1 Pit. In the Nlure, Ole Eastem Mining District will be Oewatered, antl ihks Water along with incremental storege from ongoing operations will ba stored in the southern poNOn of Ma Wastem Mining District (capacity aboul1,410 acre-8). TRO]-59 Table FSI-25 o4/ovo7