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Colowyo Coal Company <br />Exhibit Lk <br />2018 Annual Reclamation and <br />Hydrology Report <br />Water Quality Data <br />1983-2018 <br />Lower Taylor Creek <br />COLOWYO MINE <br />(LTC) <br />LTC <br />Listing of Stream Lab Data <br />Flow <br />Field <br />Field <br />Field <br />Lab <br />Lab <br />TDS <br />NO3+NO2 <br />NH3 <br />Bicarb <br />No datum => Blank <br />Rate <br />pH <br />Temp <br />Conduct <br />pH <br />Conduct <br />-180 <br />TSS <br />as N <br />as N <br />as HCO3 <br />Sulfate <br />P <br />As <br />Ca <br />Fe <br />Pb <br />Mg <br />Mn <br />Hg <br />Se <br />Na <br />Zn <br />cfs <br />S U <br />deg C <br />umho/cm <br />S U <br />umho/cm <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />mgA <br />Statistics <br />Mean <br />036 <br />835 <br />951 <br />186036 <br />816 <br />176383 <br />141109 <br />28982 <br />126 <br />009 <br />38000 <br />67406 <br />274 <br />000 <br />9514 <br />383 <br />008 <br />12382 <br />028 <br />000 <br />001 <br />17771 <br />006 <br />Std. Dev. <br />080 <br />031 <br />642 <br />69356 <br />030 <br />61489 <br />59211 <br />96320 <br />136 <br />006 <br />14746 <br />33866 <br />2108 <br />000 <br />2576 <br />1603 <br />008 <br />4152 <br />105 <br />000 <br />0 00 <br />15027 <br />012 <br />Coal. Var. <br />Range <br />63 <br />19 <br />251 <br />35172 <br />17 <br />3480 <br />2766 <br />6938 <br />499 <br />036 <br />658 <br />1591 <br />184 995 <br />0 027 <br />1332 <br />13199 <br />028 <br />230 <br />7 845 <br />00009 <br />0 015 <br />589 <br />0 795 <br />Max <br />63 <br />93 <br />25 <br />3740 <br />87 <br />3680 <br />2910 <br />6940 <br />5 <br />038 <br />725 <br />1610 <br />185 <br />0 028 <br />159 <br />132 <br />03 <br />238 <br />785 <br />0 001 <br />0 016 <br />595 <br />08 <br />Min <br />0 <br />74 <br />-01 <br />2228 <br />7 <br />200 <br />144 <br />2 <br />001 <br />002 <br />67 <br />19 <br />0 005 <br />0 001 <br />258 <br />001 <br />002 <br />8 <br />0 005 <br />00001 <br />0 001 <br />6 <br />0 005 <br />Max at <br />4/29/1986 <br />8/12/1983 <br />6/18/1987 <br />11/10/2011 <br />9/13/2016 <br />11/30/2017 <br />11/10/2011 <br />2/28/1990 <br />5/21/2013 <br />2/5/2001 <br />11/10/2011 <br />11/10/2011 <br />3/31/1988 <br />3/1/1998 <br />11/10/2011 <br />2/28/1990 <br />228/1990 <br />10/12/1988 <br />3/1/1988 <br />2/5/2001 <br />8/13/1984 <br />9/19/2017 <br />228/1990 <br />Min at <br />12/132002 <br />628/1985 <br />11/11/1999 <br />5/19/1997 <br />222/1989 <br />228/1990 <br />228/1990 <br />3/30/1989 <br />2!72000 <br />10/5/1989 <br />3/52001 <br />228/1990 <br />9/11/1997 <br />1/6/1998 <br />2/52001 <br />9/13/1995 <br />4/172000 <br />228/1990 <br />7/1/1996 <br />6/1/1993 <br />10/3/1996 <br />228/1990 <br />628/1985 <br />9 Of Samples <br />229 <br />114 <br />120 <br />112 <br />154 <br />154 <br />81 <br />154 <br />69 <br />70 <br />77 <br />77 <br />77 <br />77 <br />79 <br />81 <br />78 <br />75 <br />76 <br />77 <br />77 <br />77 <br />77 <br />Station Date <br />LTC 1/13/1986 <br />001 <br />82 <br />7 <br />1700 <br />LTC 128/1986 <br />009 <br />1 <br />84 <br />1300 <br />316 <br />LTC 224/1986 <br />049 <br />8 <br />83 <br />1810 <br />1225 <br />6210 <br />333 <br />015 <br />350 <br />584 <br />332 <br />0 003 <br />134 <br />28 <br />002 <br />234 <br />00001 <br />0 015 <br />103 <br />oil <br />LTC 327/1986 <br />064 <br />4 <br />8 <br />1920 <br />924 <br />LTC 429/1986 <br />63 <br />8 <br />8 <br />1110 <br />765 <br />LTC 5/30/1986 <br />244 <br />18 <br />79 <br />1350 <br />202 <br />LTC 6/17/1986 <br />83 <br />1500 <br />1140 <br />136 <br />326 <br />002 <br />285 <br />539 <br />01 <br />0 001 <br />100 <br />037 <br />004 <br />00002 <br />0 012 <br />83 <br />001 <br />LTC 6/18/1986 <br />22 <br />81 <br />18 <br />1400 <br />LTC 777/1986 <br />18 <br />84 <br />19 <br />1380 <br />LTC 724/1986 <br />054 <br />84 <br />18 <br />1475 <br />81 <br />1470 <br />12 <br />LTC 8/4/1986 <br />037 <br />87 <br />18 <br />1550 <br />82 <br />1510 <br />1262 <br />8 <br />211 <br />002 <br />278 <br />638 <br />006 <br />0 001 <br />96 <br />004 <br />002 <br />001 <br />00002 <br />0 011 <br />87 <br />001 <br />LTC 9/10/1986 <br />049 <br />8 <br />10 <br />1400 <br />LTC 925/1986 <br />054 <br />8 <br />8 <br />1600 <br />81 <br />1620 <br />82 <br />023 <br />LTC 10/13/1986 <br />8 <br />83 <br />1750 <br />1388 <br />26 <br />289 <br />002 <br />340 <br />650 <br />002 <br />0 001 <br />104 <br />012 <br />002 <br />006 <br />00002 <br />0 009 <br />107 <br />001 <br />LTC 1125/1986 <br />002 <br />1 <br />77 <br />1830 <br />60 <br />LTC 2/12/1987 <br />026 <br />0 <br />81 <br />1230 <br />912 <br />266 <br />35 <br />017 <br />264 <br />364 <br />028 <br />0 002 <br />99 <br />096 <br />002 <br />87 <br />019 <br />00002 <br />0 006 <br />72 <br />001 <br />LTC 325/1987 <br />106 <br />0 <br />76 <br />2000 <br />230 <br />LTC 5/1/1987 <br />218 <br />14 <br />78 <br />1240 <br />952 <br />LTC 6/4/1987 <br />076 <br />11 <br />LTC 6/10/1987 <br />06 <br />79 <br />1410 <br />982 <br />86 <br />26 <br />002 <br />275 <br />465 <br />004 <br />0 001 <br />91 <br />03 <br />002 <br />118 <br />004 <br />00002 <br />0 008 <br />66 <br />001 <br />LTC 6/18/1987 <br />049 <br />82 <br />25 <br />1480 <br />LTC 1221/1987 <br />026 <br />0 <br />79 <br />1990 <br />6 <br />LTC 3/1/1988 <br />026 <br />81 <br />1290 <br />1040 <br />2584 <br />313 <br />022 <br />320 <br />407 <br />103 <br />0 028 <br />101 <br />4 <br />003 <br />100 <br />785 <br />00002 <br />0 006 <br />75 <br />046 <br />LTC 3/31/1988 <br />015 <br />79 <br />1650 <br />1476 <br />2230 <br />455 <br />015 <br />406 <br />667 <br />185 <br />0 003 <br />128 <br />284 <br />002 <br />159 <br />083 <br />00002 <br />0 008 <br />156 <br />004 <br />LTC 420/1988 <br />009 <br />79 <br />1970 <br />162 <br />003 <br />LTC 5/31/1988 <br />026 <br />82 <br />1370 <br />1112 <br />272 <br />003 <br />247 <br />515 <br />014 <br />0 001 <br />95 <br />071 <br />002 <br />128 <br />01 <br />00002 <br />0 007 <br />88 <br />001 <br />LTC 627/1988 <br />026 <br />82 <br />1660 <br />1274 <br />24 <br />004 <br />265 <br />650 <br />002 <br />0 001 <br />82 <br />047 <br />002 <br />143 <br />006 <br />00001 <br />0 007 <br />94 <br />001 <br />LTC 729/1988 <br />022 <br />81 <br />1870 <br />100 <br />LTC 8/16/1988 <br />012 <br />85 <br />19 <br />1580 <br />78 <br />1880 <br />438 <br />LTC 9/19/1988 <br />009 <br />82 <br />15 <br />1280 <br />78 <br />1770 <br />6 <br />LTC 10/12/1988 <br />037 <br />8 <br />14 <br />2010 <br />81 <br />1990 <br />1804 <br />62 <br />012 <br />320 <br />1066 <br />004 <br />0 001 <br />111 <br />022 <br />002 <br />238 <br />005 <br />00001 <br />0 004 <br />126 <br />001 <br />LTC 11/30/1988 <br />001 <br />75 <br />1880 <br />2 <br />LTC 222/1989 <br />0 <br />7 <br />447 <br />318 <br />28 <br />Oil <br />83 <br />66 <br />0 323 <br />0 002 <br />28 <br />05 <br />002 <br />16 <br />006 <br />00001 <br />0 001 <br />28 <br />001 <br />LTC 3/30/1989 <br />0 003 <br />78 <br />1280 <br />2 <br />LTC 10/5/1989 <br />0 003 <br />867 <br />2440 <br />86 <br />2190 <br />1930 <br />26 <br />002 <br />310 <br />1128 <br />0 055 <br />0 001 <br />88 <br />041 <br />003 <br />160 <br />001 <br />00001 <br />0 008 <br />174 <br />001 <br />LTC 228/1990 <br />037 <br />8 <br />200 <br />144 <br />6940 <br />1 39 <br />024 <br />76 <br />19 <br />379 <br />0 003 <br />32 <br />132 <br />03 <br />8 <br />43 <br />00001 <br />001 <br />6 <br />08 <br />LTC 5/30/1990 <br />0 <br />88 <br />15 <br />1868 <br />LTC 7/19/1990 <br />0 <br />88 <br />17 <br />1991 <br />84 <br />1960 <br />38 <br />LTC 11/9/1990 <br />009 <br />82 <br />1510 <br />1132 <br />36 <br />002 <br />008 <br />240 <br />549 <br />Oil <br />0 002 <br />96 <br />57 <br />002 <br />101 <br />002 <br />00001 <br />0 001 <br />80 <br />001 <br />LTC 225/1991 <br />0 014 <br />4 <br />86 <br />1410 <br />1168 <br />116 <br />04 <br />021 <br />264 <br />597 <br />07 <br />0 006 <br />117 <br />153 <br />002 <br />98 <br />04 <br />0 0001 <br />0 001 <br />94 <br />009 <br />LTC 421/1993 <br />001 <br />8 <br />3 <br />2290 <br />8 <br />2250 <br />26 <br />LTC 527/1993 <br />35 <br />88 <br />17 <br />1030 <br />84 <br />997 <br />596 <br />LTC 611/1993 <br />14 <br />84 <br />19 <br />989 <br />83 <br />958 <br />608 <br />8 <br />055 <br />Oil <br />238 <br />233 <br />002 <br />0 001 <br />64 <br />24 <br />002 <br />64 <br />003 <br />00001 <br />0 004 <br />32 <br />001 <br />LTC 523/1995 <br />0 007 <br />82 <br />15 <br />2080 <br />83 <br />2030 <br />1560 <br />5 <br />008 <br />Oil <br />310 <br />740 <br />014 <br />0 006 <br />124 <br />47 <br />002 <br />156 <br />008 <br />00002 <br />0 002 <br />124 <br />004 <br />LTC 6/19/1995 <br />0 007 <br />85 <br />14 <br />1245 <br />84 <br />1270 <br />26 <br />LTC 726/1995 <br />0 007 <br />83 <br />12 <br />1850 <br />82 <br />1890 <br />5 <br />LTC <br />