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Colowyo Coal Company, L.P. Water Quality Data 1982-2004 Lower Good Spring Creek COLOWYO MINE LGSC (LGSC) Llsdng ¢f Stream Lab Data Flow Fi¢Id Field Fi¢Id Lab Lab TDS NO3 NO2 N03+NO2 NH3 Total Bicarb Ambig. 5W Ambig. SW Ambig. SN Ambig. SM Ambig. SN Ambig. SN Ambig. SN Ambig. SN Ambig. SM Ambig. SW No datum => Blank Rate pH temp Conduct pH Conduct -180 TSS as N as N as N as N P as CaCO3 Sulfate As Ca Fa Pb Mg Mn Hg Se Na Zn cis S.U. degC umhalcm S.U. umha/cm mgll mgll mg4 mgll mg/I mg/I mg/I mg/l mgll mg/I mg/I mg4 mg/I mg/I mg/I mg/I mgll mg/l mg/I Statlsticz Meen 4.28 8.06 9.43 1657.77 800 1697.39 133752 66.38 1.42 0.07 2.54 0.72 0.06 398.69 661.40 000 742.17 O.fi0 003 747.67 0.12 0.00 0.01 72.79 0.02 Sid. Dev. 5.50 Od2 6.05 377.23 0.23 321.53 36044 268.45 0.82 0.07 2.20 0.24 0.07 77.25 16058 000 25.47 O.fi3 003 28.87 0.06 0.00 000 25.93 0.03 Coef. Var. Range d694 4.7 25.6 2760 2.4 2659 3330 3698 3.77 0.04 7.99 2.25 0.495 572 685 0.0174 140 4.26 0.199 149.4 0.315 0.0009 0.029 744.3 0.195 Max 47 9.3 25 2900 8.5 2820 4050 3700 4.1 0.05 8.29 2.26 0.5 602 945 0.018 208 4.27 0.2 226 0.32 0.001 003 164 02 Min 0.06 4.6 -O.fi 740 6.1 tfit 720 2 0,33 0.01 0.3 001 0.005 30 260 0.0006 6B 0.03 0.001 76.6 0.005 0.0007 0007 19.7 0005 Max at 427/7998 17/78/1997 7/26/7982 10/3/1996 8119/ 7991 7/79/7993 71/fl2000 4/30/7985 12/28/7989 SR/2001 12126/1985 12/14/1989 78/7999 102412002 17/4/7989 48/7982 77/28/1989 487/1990 5/77/2001 72/4/1989 48/1982 7/762004 1NdH989 7 0/N7998 1 0122000 Min at 17/6/7999 7/82002 17/1& 1996 d/52002 N14/ 7991 623/7992 523/7995 9/30/7994 B/70800d 11/12004 8/17/1992 8/108004 9/17/7997 5/14/1992 520/7997 11/1200d 3H3/198d ?/1/1988 1 1/52001 520/7997 7812000 fi/1/7993 9802007 4/772000 628/7985 #Of Sample! 257 201 247 201 282 266 127 279 41 37 92 9fi 97 107 707 107 140 114 107 1d7 705 107 107 109 707 Station Sample Flow Fieltl Field Field Lab Lab TDS N03 NO2 NO3+N02 NH3 Total 8icarb Ambig. SW Ambig. SW Ambig, SN Ambig. SN Ambig. SM Ambig. SM Ambig. SN Ambig. 51A Ambig. SN Ambig. Sw Name Oate Rate pH Temp Contluct pH Conduct -780 TSS asN asN asN asN P as CaCO3 SuHata As Ca Fe Pb Mg Mn Hg Se Na Zn cis S.U. degC umho/cm S.U. umhNCm mg/I mg8 mg4 mgll mg/I mgll mg8 mge mge mg/I mgll mg/I mg/I mg/I mg/I mg/I mgB mg/I mg8 LGSC 8212000 0.98 8.28 73.5 2037 7.7 1890 7 LGSC 982000 1.26 8.02 76.1 2048 7.6 1880 1600 77 0.35 LGSC 108/2000 158 8.6 10.3 2089 8 7790 1630 5 7.05 0.05 0.07 478 fi78 0.005 138 0.25 0.02 153 0.02 0.001 0.072 107 0.2 LGSC 11/82000 1.75 8.29 0.5 1182 7.7 7920 4050 8 0.05 LGSC 17/42000 7.91 8.28 7.7 1173 7.5 7860 5 LGSC 182001 7.8 8.32 7.4 1727 76 1750 5 LGSC 2/52001 84 1620 1500 20 2.31 0.05 2.33 0.3 0.06 456 730 0.005 152 0.28 0.2 152 0.168 0.001 0.008 87.8 0.05 LGSC 315@007 0.98 0.29 1.8 7015 8.1 1630 20 136 138 LGSC d/162001 4.07 8.11 4.2 1078 7.8 76d0 20 146 738 LGSC 5(72001 1.69 8.3 B.B 1080 8.1 7450 1100 20 7.3 0.05 1.3 0.3 0.05 388 520 0.005 136 0.27 0.2 720 0.046 0.001 0.007 50.3 0.05 LGSC 8/152001 2.92 8.79 8.7 7254 8.2 7370 20 137 140 LGSC 7/52001 0.95 8.17 15.2 7884 B 7750 20 139 152 LGSC 8/62007 1.26 8.03 14,4 7663 8.1 1740 7680 164 0.52 0.01 0.52 0.12 0.2 474 720 0.001 146 0.35 0.04 1fi1 0.768 0.0002 0.004 91 0.07 LGSC 9808001 0.25 8.16 77.2 7545 7.8 1950 7530 6 2.74 0.01 2.74 0.05 004 462 720 0.001 140 0.45 0.04 155 0.701 0.0002 0.007 92.6 0.07 LGSC 10/72001 2.15 8.04 B.5 1420 8.1 2000 5 132 152 LGSC 10/17/2007 0.36 8.14 5.4 1418 7.3 7740 6 151 159 LGSC 1775/2005 0.42 8.18 d.2 1303 B 7500 1510 5 1.51 0.01 7.57 0.15 0.02 395 720 0.001 144 0.51 0.001 143 0.127 0.0002 0.007 93.4 0.01 LGSC 12/5/2001 0.48 8.04 1.9 7402 7.9 1950 5 152 159 LGSC 722002 5.2 7.23 0.2 7017 7.8 7950 B id6 147 LGSC 7/11/2002 0.26 7.75 7.2 7021 7.9 i8W 1520 2.18 0.01 2.18 0.05 0.04 416 710 0.001 158 0.15 0.04 ifi3 0.113 0.0002 0.009 95.6 0.01 LGSC 3/14/2002 0.3 7.91 1.7 768 7.6 1580 32 tOB 111 LGSC 4/52002 2.27 B.O6 6.3 740 7.9 1740 1380 6 7.07 0.01 1.07 0.05 0.02 343 680 0.007 748 0.25 0.04 144 0.09 0.0002 0007 77.8 0.07 LGSC 5/82002 1.26 7.97 7.2 7357 7.9 1970 1120 78 0.47 0.01 0.47 0.05 0.02 386 760 0.007 td3 0.36 0.04 757 0.734 0.0002 0.005 111 0.01 LGSC 62812002 702 f7.7 1737 B.1 2020 10 154 178 LGSC 7/82002 4.6 16.9 2060 8.1 2060 6 739 189 LGSC 82/2002 B.Ofi 15.2 2777 7.9 2190 10 id8 175 LGSC 1082002 4.07 7.9d 8.3 2430 7.7 2d50 fi 150 200 LGSC 70242002 3.06 8.13 6.2 2275 7.5 2320 1790 fi 0.62 0.01 0.62 0.34 0.02 532 850 0.001 148 0.45 0.04 787 0.133 0.0002 0.003 122 0.07 LGSC 17/13/2002 4.07 7.95 i.i 7270 7.7 2140 165 192 LGSC 7232003 4.07 8 1.6 2070 7.8 2070 5 140 148 LGSC 7/122003 5.03 8 0.7 2070 8 2050 1680 5 1.07 0.01 1.07 0.2 0.03 514 750 0.001 1d8 0.03 0.04 162 0.173 00002 0.005 104 0.01 LGSC 3/102003 4.38 8.7 3.1 1780 8 7730 14 138 746 LGSC d/12003 3.77 B.2 6.2 7860 B.7 1840 6 128 132 LGSC 5282003 3.77 8.1 13.8 7740 B 1750 1360 8 1.02 0.04 1.06 0.2 0.05 437 590 0.0009 152 0.27 0.04 150 0.103 O.OW2 0.007 68.7 0.01 LGSC 682003 3.77 8.7 12.4 1680 8.1 7700 72 163 143 CF 77.14 2004 LGSCOd.xls 3/11200510:03 AM