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Colowyo Coal Company <br />Exhibit IA <br />2018 Annual Reclamation and 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 />0 D6 <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 />41 52 <br />105 <br />000 <br />000 <br />15027 <br />012 <br />Coef. Var. <br />Range <br />63 <br />1 9 <br />251 <br />35172 <br />1 7 <br />3480 <br />2766 <br />6938 <br />499 <br />036 <br />658 <br />1591 <br />184 995 <br />0 027 <br />1332 <br />131 99 <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 />228/1990 <br />2/28/1990 <br />10/12/1988 <br />3/1/1988 <br />2/5/2001 <br />8/13/1984 <br />9/19/2017 <br />2/28/1990 <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 />2172000 <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 /># 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 8/19/1999 <br />06 <br />836 <br />98 <br />2008 <br />81 <br />1810 <br />5 <br />LTC 9/3/1999 <br />076 <br />842 <br />158 <br />1406 <br />82 <br />1690 <br />6 <br />LTC 10/13/1999 <br />051 <br />83 <br />23 <br />1203 <br />82 <br />1950 <br />1600 <br />5 <br />072 <br />005 <br />405 <br />644 <br />005 <br />0 005 <br />704 <br />009 <br />002 <br />170 <br />002 <br />0 001 <br />0 005 <br />157 <br />001 <br />LTC 11/11/1999 <br />051 <br />82 <br />-01 <br />1253 <br />8 <br />2280 <br />7 <br />LTC 12/6/1999 <br />0 <br />81 <br />01 <br />1331 <br />78 <br />2440 <br />5 <br />LTC 2/72000 <br />0 <br />84 <br />1 8 <br />1345 <br />77 <br />1970 <br />1680 <br />5 <br />001 <br />005 <br />438 <br />686 <br />005 <br />0 005 <br />103 <br />Oil <br />002 <br />156 <br />002 <br />0 001 <br />0 005 <br />122 <br />001 <br />LTC 3172000 <br />044 <br />858 <br />32 <br />1174 <br />78 <br />1840 <br />5 <br />LTC 4/172000 <br />106 <br />844 <br />161 <br />1790 <br />79 <br />2070 <br />1660 <br />5 <br />204 <br />005 <br />188 <br />692 <br />005 <br />0 007 <br />846 <br />005 <br />002 <br />164 <br />002 <br />0 001 <br />0 005 <br />386 <br />001 <br />LTC 6/52000 <br />059 <br />836 <br />203 <br />1741 <br />79 <br />1790 <br />6 <br />LTC 8212000 <br />0 <br />LTC 2/52001 <br />1 59 <br />83 <br />1 <br />2228 <br />74 <br />359 <br />260 <br />20 <br />054 <br />038 <br />67 <br />60 <br />0 118 <br />0 005 <br />258 <br />202 <br />02 <br />183 <br />0 079 <br />0 001 <br />0 005 <br />302 <br />005 <br />LTC 3/52001 <br />049 <br />845 <br />0 <br />1008 <br />82 <br />1800 <br />20 <br />123 <br />136 <br />LTC 122002 <br />0 <br />LTC 2/112002 <br />0 <br />LTC 3/142002 <br />0 <br />LTC 6/28/2002 <br />0 <br />LTC 7/32002 <br />0 <br />LTC 822002 <br />0 <br />LTC 10/32002 <br />0 <br />LTC 10242002 <br />0 <br />LTC 12/132002 <br />0 <br />LTC 1232003 <br />0 <br />LTC 2/122003 <br />0 <br />LTC 3/102003 <br />1 55 <br />83 <br />1 <br />705 <br />79 <br />703 <br />1040 <br />434 <br />345 <br />LTC 4/12003 <br />0 <br />LTC 5282003 <br />0 <br />LTC 622003 <br />0 <br />LTC 7/12003 <br />0 <br />LTC 8172003 <br />0 <br />LTC 922003 <br />0 <br />LTC 10/72003 <br />0 <br />LTC 11/11/2003 <br />0 <br />LTC 12/12003 <br />0 <br />LTC 1212004 <br />0 <br />LTC 2/162004 <br />0 <br />LTC 3/112004 <br />0 <br />LTC 4/52004 <br />0 <br />LTC 5/42004 <br />0 <br />LTC 6/172004 <br />0 <br />LTC 7/192004 <br />0 <br />LTC 8/102004 <br />0 <br />LTC 9/162004 <br />0 <br />LTC 10/52004 <br />0 <br />LTC 11/12004 <br />0 <br />LTC 12/142004 <br />0 <br />LTC 1/62005 <br />0 <br />LTC <br />