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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />Exhibit lA <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 />2n <br />cis <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 />mg4 <br />mgA <br />Statistics <br />Mean <br />036 <br />835 <br />951 <br />186036 <br />816 <br />176383 <br />141109 <br />28962 <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 />1 36 <br />006 <br />14746 <br />33866 <br />21 08 <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 />19 <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 />256 <br />001 <br />002 <br />8 <br />0 005 <br />00001 <br />0 001 <br />6 <br />0 005 <br />Max at <br />429/1986 <br />8/12/1983 <br />6/18/1987 <br />11/102011 <br />9/132016 <br />11/302017 <br />11/102011 <br />228/1990 <br />5/212013 <br />2/52001 <br />11/102011 <br />11/102011 <br />3/31/1988 <br />3/1/1998 <br />11/102011 <br />228/1990 <br />228/1990 <br />10/12/1988 <br />3/1/1988 <br />2/52001 <br />8/13/1984 <br />9/192017 <br />228/1990 <br />Min at <br />12/132002 <br />628/1985 <br />11/11/1999 <br />5/19/1997 <br />222/1989 <br />2/28/1990 <br />228/1990 <br />3/30/1989 <br />2/72000 <br />10/5/1989 <br />3/5/2001 <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 2/102005 <br />0 <br />LTC 3/92005 <br />0 <br />LTC 4202005 <br />0 <br />LTC 5232005 <br />0 <br />LTC 621/2005 <br />0 <br />LTC 7/192005 <br />0 <br />LTC 8222005 <br />0 <br />LTC 9/142005 <br />0 <br />LTC 10/172005 <br />0 <br />LTC 11212005 <br />0 <br />LTC 12/132005 <br />0 <br />LTC 1/182006 <br />0 <br />LTC 2212006 <br />0 <br />LTC 3/152006 <br />0 <br />LTC 4/122006 <br />0 <br />LTC 5/182006 <br />0 <br />LTC 6/62006 <br />0 <br />LTC 7252006 <br />0 <br />LTC 8232006 <br />0 <br />LTC 9202006 <br />0 <br />LTC 10/162006 <br />0 <br />LTC 11/152006 <br />0 <br />LTC 12/132006 <br />0 <br />LTC 1/112007 <br />0 <br />LTC 2172007 <br />0 <br />LTC 1/132007 <br />0 <br />LTC 4/92007 <br />0 <br />LTC 5/152007 <br />0 <br />LTC 6/112007 <br />0 <br />LTC 7/172007 <br />0 <br />LTC 6/142007 <br />0 <br />LTC 9202007 <br />0 <br />LTC 10/162007 <br />0 <br />LTC 11/8/2007 <br />0 <br />LTC 12/182007 <br />0 <br />LTC 1/152008 <br />0 <br />LTC 2/132008 <br />0 <br />LTC 3/112008 <br />0 <br />LTC 4/152008 <br />0 <br />LTC 5/122008 <br />0 <br />LTC 6/182008 <br />0 <br />LTC 8/132008 <br />0 <br />LTC 11/102008 <br />0 <br />LTC 3/172009 <br />0 <br />LTC 6132009 <br />0 <br />LTC 8/192009 <br />0 <br />LTC <br />