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COLOWYO MINE Colowyo Coal Company, L. P. Water Quality Data 1983-2004 Lower Taylor Creek (LTC) Listing of Stream Leb Date Flow Field Field Field Lab Lab TDS NO3+NO2 NH3 Bicarb Amhig. Ambig. SN Amhig. SN Ambig. SN Ambig. SVI Ambig. SW Ambig. SN Amhig. SN Ambig. SN Ambig. SN A mbig. SN No datum => Blank Rate pH Temp Conduct pH Conduct -180 TSS as N as N as CaCO3 Sulfate P As Ce Fe Pb Mg Mn Hg Se Na Zn cts S.U. deg C umho/cm S.U. umho/cm mg/I mg/I mgll mg/l mg/I mgA mgA mgA mg/I mg/I mg/I mg/I mg/I mgA mgA mgA mg/l Statlstlcs 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 0.00 90.86 4.94 0.04 116.88 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.fi5 1.24 0.00 0.00 3fi.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 8.6 3570 1930 20584 4.95 0.38 467 1128 185 0.028 134 132 0.3 238 7.85 0.001 0.01fi 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 0 0.005 0.0001 0.001 6 0.005 Max at 429/1986 8/12/ 1983 6/18/1987 3/fi/1998 2/25/ 1991 3/6/1998 10/5/1989 3/1/1988 628/1985 2/52001 11/18/1997 10/5/1989 3/31/1988 3/1/1998 224/1986 228/1990 228/1990 10/12/1988 3/1/1988 2/52001 8/13/1984 10/5/1989 2/28/1990 Min at 12/132002 628/1985 11/11/1999 5/79/1997 222/ 1989 228/1990 228/1990 3'30/1989 2/72000 10/5/1989 3/52001 228!1990 9/11/1997 1/fi/1998 2/5/2001 9/13/1995 4/172000 228/1990 7/1/1996 fi/1/1993 1 0/3/7996 228/1990 fi28A985 # 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 Lah Lab 7D5 NO3+NO2 NH3 Bicarb Ambig. Ambig. SN Amhig. SN Ambig. SN Ambig. SN Ambig. SW Amblg. SN Ambig. SN Ambig. SN Ambig. SVI Ambig. SN Name Date Rate pH Temp Conduct pH Conduct -180 TSS as N as N as CaCO3 Sulfate P As Ce Fe Pb MB Mn Hg Se Na Zn cfs S.U. degC umho/cm S.U. umho/cm mg/I mgA mg/I mg/I mg/I mgA mg/I mg/1 mgA mg/I mgA mgA mgA mgA mgA mg/I mg/I LTC 3/31/1983 8.1 1230 885 140 0.08 336 410 0.06 0.002 73 1.54 0.03 100 0.12 0.001 0.002 74 0.018 LTC 5/5/1983 8 1375 8 1230 96 1.95 LTC fi/15/1983 975 8 960 740 106 0.02 283 233 0.04 0.002 72 0.5 0.02 75 0.09 0.001 0.002 43 0.005 LTC 7/14/1983 8 1220 134 1.efi L7C 721/1983 8 1250 108 1.61 LTC 82/1983 8.2 1260 120 LTC 8/12/1983 9.3 1170 8 1345 44 0.72 LTC 8/19/1983 1160 8 1220 830 30 LTC 825/1983 8 1230 850 56 LTC 92/1983 7.9 1280 890 42 LTC 9/9/1983 8 1280 910 4 LTC 9/16/1983 8.1 1200 1070 8 LTC 9/23/1983 8.2 1200 1110 6 0.02 317 416 0.02 0.002 68 0.55 0.05 102 0.02 0.001 0.002 70 0.01 LTC 927/1983 8.2 1200 1110 60 LTC 10/4/1983 8.2 120D 1220 56 LTC 10/12/1983 8 13.5 8.2 1200 1210 32 LTC 10/19/1983 9.5 8.3 1200 1220 20 LTC 1027/1983 8.4 9 1350 8.1 1380 30 LTC 11/18/1983 8 1000 990 90 L7C 12/12/1983 8 1460 1000 26 0.77 0.02 329 417 0.02 0.002 101 0.71 0.05 85 0.07 0.001 0.002 66 0.005 LTC 3/13!1984 0.22 8.7 2 7.1 740 440 656 0.07 0.02 140 206 0.02 0.002 32 3.65 0.02 49 0.43 0.0005 0.002 42 0.54 LTC 4/30/1984 8 10 8.2 1180 596 LTC 525/1984 8.2 18 8.1 1030 5150 LTC 725/1984 0.24 8.3 22 1550 8 1300 50 L7C 8/13/7984 0.22 8 18 1545 8.3 1620 1260 ifi 3.72 0.02 266 Sfi9 0.02 0.002 91 0.08 0.02 126 0.02 0.001 0.016 89 0.01 LTC 9/6/1984 0.48 8.1 15 1700 8.4 1750 i6 LTC 102/1984 0.64 7.8 8 1080 7.8 1120 720 4400 1.3 0.02 220 377 2.24 0.003 80 0.05 65 1.39 0.001 0.002 73 0.27 LTC 11/1/1984 0.49 8.5 10 1825 7.fi 7650 88 LTC 11/6/1984 7.fi 1650 88 LTC 11/16/7984 8.1 1950 368 LTC 12/12/7984 8.1 2010 378 CF 17.14 2004 LTC04xls 322005 9:42 AM