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COLOWYO MINE Colowyo Coal Company, L.P. Water Quality Data 1983-2004 Lower Taylor Creek (LTC) Listing of Stream Lab Data Flow Field Field Field Lab Lab TDS NO3+NO2 NH3 Bicarh Ambig. Ambig. SN Ambig. SVt Ambig. SN Ambig. SN Ambig. SW Ambig. SN Ambig. SN Ambig. SN Ambig. SN Ambig. SN Ne datum =~ Blank Rate pH Temp Conduct pH Canducl -180 TSS as N as N as CeCO3 Sulfate P As Ca Fe Pb Mg Mn He Se Na Zn cfs S.U. degC umho/cm S.U. umho/cm mgA mg/I mg8 mg/I mg/I mg/I mg/1 mg/I mg/I mgfl mg/I mgll mgll mg/I mgll mg/I mg/l StaOsttcs Mean 0.52 8.32 10.48 1613.23 8.09 1592.35 1127.76 468.15 1.45 0.08 302.67 512.25 3.80 6.OD 90.86 4.94 0.04 176.88 0,38 0.00 0.01 92.79 0.06 Std. Dev. 0.95 0.33 6.50 452.45 0.27 438.92 355.76 2035.66 1.45 0.07 83.38 211.36 24.93 0.00 25.92 18.67 0.05 45.65 1,24 0.00 0.00 36.07 0.14 Coef. Var. Range 6.3 1.9 25.1 3357.2 1.6 3370 1786 20582 4.94 0.36 400 1109 184.995 0.027 108.2 131.99 0.28 230 7.845 0.0009 0.015 168 0.795 Max 6.3 9.3 25 3580 B.fi 3570 1930 20584 4.95 0.38 467 1128 185 0.028 134 132 0.3 238 7,85 0.001 0.016 174 0.8 Min 0 7.4 -0.1 222.8 7 200 144 2 0.01 0.02 67 19 0.005 0.001 25.8 0.01 0.02 B 0.005 0.0001 0.001 fi 0.005 Max at 4/29/1986 8/12/ 1983 6/18/1987 3/6!1998 2/25/ 1991 3/6/1998 10/5/1989 3/1/1988 6/28/1985 2/52001 11/18/1997 10/5/1989 3/31/1988 3/1/1998 2/24/1986 228/1990 228/1990 10!12/1988 3/1/1988 2/5@001 8/13/1984 1 0/5/1989 22811990 Min at 12/132002 628/ 1985 11/11/1999 5/19!1997 222/ 1989 2/28/1990 228/1990 3/30/1989 2/72000 10!5/1989 3/5/2001 228/1990 9/11/1997 1/6/1998 2/5/2001 9/13/1995 4/172000 228/1990 7/1/1996 6/1/1993 10/3/1996 228/1990 62811985 # Of Samples 145 92 98 90 132 132 59 132 47 48 55 55 55 55 57 59 56 53 54 55 55 55 55 Station Sample Flow Field Field Field Lab Lah TDS NO3+NO2 NH3 Bicarb Ambig. Ambig.SN Ambig. SN Ambig.SN Ambig. SN Ambig.SW Ambig. SN Ambig. SN Ambig. SN Ambig. SlA Ambig.SW Name Date Rate pH Temp Conduct pH Conduct -180 T55 es N as N as CaCO3 Sulfate P As Ca Fe Pb Mg Mn Hg Se Na Zn cfs S.U. degC umho/cm S.U. umho/cm mgA mg/l mgA mg8 - mg8 mg/l mgfl mg8 mg/I mg/I mg/I -- mg/I --- mg/l -- mg/I --- mgll --- mg/I _ mg/I _-- LTC ~ 7/6/79% --_ 0.4 _-- 8.9 22 ^ 1629 8.3 `1560 _- _-- 73 --- ~ ---- -- -- LTC 8/3/7998 0.28 8.6 15 1692 8.2 1550 1200 40 1.57 0.05 383 493 0.05 0.005 72.9 0.66 0.02 111 0.02 0.007 0.005 96 0.01 LTC 9/10/79% 0.37 8.6 74.7 1843 8.3 1590 5 LTC f0/&1998 0.18 8.6 12 1954 8.3 1650 1350 5 1.65 0.05 321 537 0.05 0.005 80.2 0.12 0.02 122 0.02 0.001 0.005 123 0.07 LTC 11/5/1998 0.3 8.3 8.9 2075 7.8 1870 6 LTC 222/7999 8.7 5.5 2027 8.1 1860 22 LTC 3/3/1999 0.7fi 8.6 7.1 1848 8.1 1830 16 LTC 4/611999 1 8.46 2107 8 1860 6 LTC 5/17/1999 3 8.48 7.7 1017 8.2 1380 980 86 1.53 0.05 351 362 0.05 0.005 72.4 1.9 0.02 %.5 O.Ofi 0.001 0.005 81.4 0.01 LTC 6/7017999 0.7 8.59 9.5 1406 a 1270 76 LTC 7/6/1999 2.1 8.4 17.1 1480 6.1 1470 7040 38 0.76 0.05 314 400 0.05 0.005 63.2 0.51 0.02 102 0.02 0.001 0.005 82.fi 0.01 LTC 8/19/7999 0.6 8.36 9.8 2008 8.1 1810 5 LTC 9/3/7999 0.76 8.42 15.8 14% 8.2 1690 6 LTC 10/73/1999 0.51 8.3 2.3 1203 8.2 1950 1600 5 0.72 0.05 405 644 0.05 0.005 70.9 0.09 0.02 170 0.02 0.001 0.005 157 0.01 LTC 11/77/1999 0.51 8.2 -0.1 1253 8 2280 7 LTC 72/6/1999 0 8.7 0.1 1331 7.8 2440 5 lTC 2!72000 0 8.4 1.8 1345 7.7 1970 1680 5 0.01 0.05 438 686 0.05 0.005 103 0.71 0.02 156 0.02 0.007 0.005 122 0.01 LTC 3/7/2000 0.q4 8.58 3.2 1174 7.8 1840 5 LTC 4/172000 7.06 8.44 18.1 1790 7.9 2070 1660 5 2.04 0.05 188 fi92 0.05 0.007 84.6 0.05 0.02 164 0.02 0.001 0.005 38.6 0.07 LTC 6/52000 0.59 8.36 20.3 1741 7.9 1790 6 Lrc 621naoo 0 LTC 2/52001 1.59 8.3 1 222.8 7.4 359 260 20 0.54 0.38 67 60 0.178 0.005 25.8 2.02 0.2 78.3 0.079 0.007 0.005 30.2 0.05 LTC 3/52001 0,49 8.45 0 7008 8.2 1800 20 123 136 LTC 122002 0 LTC 2/112002 0 LTC 3/142002 0 LTC 6282002 0 LTC 7/82002 0 Lrc 6nngo2 0 LTC 10/32002 0 LTC 7024/2002 0 Lrc wla2ooz o CF 17.14 2004 322005 9:42 AM LTC04.~ds