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Colowyo Coal Company, L.P Water Guality Data 1982.2004 Lower Good Spring Creek COLOWI'O MINE (LGSC) LGSC Listing of Stream Lab Data Flaw Field Field Field Lab Lab TDS NO3 NO2 NO3+NO2 NH3 Total Bicarb Ambig. SW Ambig. SW Ambig. SN Ambig. SH Ambig. SN Ambig. SM Ambig. SN A mbig. SM A mbig. SN A mbig. Sw No tlatum => Blank Rate pH Temp Conduct pH Conduc[ -180 TSS as N as N as N as N P as CaCO3 Sulfate As Ca Fe Pb Mg Mn Hg Se Na Zn cis S.U. degC umho/cm S.U. umho/cm mg/l mg8 mgll mgfl mgA mgfl mg/I mgfl mgfl mg/I mgfl mg/l mg/I mg8 mgfl mg/I mg/l mgll mg4 Statistics Mean 4.28 8.06 9A3 1651.77 H00 1697.39 1337.52 66.38 1.42 001 2.Sd 0.12 0.06 398.69 661.40 000 142.11 0.6D 0.03 747.61 0.12 0.00 0.01 72.19 0.02 Std. Dev. 5.50 0.42 6.05 377.23 0.23 321.53 3fi0.44 268.45 082 0.01 2.28 0.24 0.07 77.25 16058 000 2541 0.63 0.03 28.87 O.Ofi 0.00 0.00 25.93 0.03 Ccef. Var. Range 46.94 4.7 25.6 2160 2.4 2659 3330 3698 3.77 0.04 7.% 2.25 0.495 572 685 0.0174 140 4.26 0.1% 749.4 0.375 0.0009 0.029 1443 0.195 Max 47 9.3 25 2900 8.5 2820 4050 3700 4.1 0.05 8.29 2.2fi 0.5 602 965 0.018 208 4.27 0.2 226 0.32 0.001 0.03 164 0.2 Min 0.06 d.6 -0.6 740 6.1 767 720 2 0.33 0.01 0.3 0.07 0.005 30 260 0.0006 68 0.03 0.007 76.fi 0.005 00001 0007 79.7 0.005 Max at 4/27/7998 11/1&1997 7/2611982 1013H9% 8119/ 1991 1/19/7993 11/8/2000 4/30/1985 12/28/1%9 5/7/2001 1228/7985 72/14/7989 1/7/1999 102412002 1?/d/1989 40/1982 12/78/1989 427/1998 5/170001 17/4/7989 40/1982 2/162004 1 0/4/1989 1 0/8/1998 100/2000 Min at 17/6/7999 7/82002 12/181 1996 4/52002 5/14/ 1991 623/1992 52317995 9/30//996 8/102004 11/12004 8/17/1992 8/102004 9/17/1997 5Itd17992 520/1997 17/12004 3113/1984 2/1/1908 7 1/52007 520/1997 71312000 W117993 9202001 4/172000 6R&1985 #OF Sample=. 257 201 247 201 282 2% 127 279 41 37 92 96 97 707 107 707 140 114 107 147 105 107 iW 709 107 Station Sample Flaw Field Field Field Lab Lab TOS NO3 NO2 NO3+NO2 NH3 Total Bicam Ambig. SW Ambig. Sw Ambig SN Ambig. 5d Ambig. SN Ambig, SN Ambig. SN Ambig. SN Ambig. SN Ambig. SW Name Date Rate pH Temp ConduM pH Conduct -i B0 TSS as N as N as N as N P as CaCO3 Sulfite As Ce Fe Pb Mg Mn Hg Se Na Zn cis S.U. degC umho/cm S.U. umho/cm mg/I mgfl mg/I mgll mgA mgfl mg/I mgfl mg/I mg/I mgfl mg/l mg8 mgfl mg/I mg/I mg/I mg/I mgfl LGSC 10/16n985 6.ii 8.6 7 1025 7.0 191D 12 LGSC 1028/7985 5.53 8.2 8 7075 LGSC 10/30/1985 8.1 7860 1506 24 7.6 OOfi 0.02 388 840 0.002 790 0.13 0.02 780 0.08 00002 0.%3 88 0.07 LGSC 11/26/7%5 8.71 4 7.5 1720 16 LGSC 1226/1985 10.76 0 7.9 i8W 1570 50 8.29 0.03 0.02 384 834 0.001 791 0.34 0.02 777 0.72 0.0002 0.011 81 0.07 LGSC 128H9% 13.55 2 8 1940 68 LGSC 724/79% 13.55 8 8.3 1700 1278 420 5.0 0.02 0.35 346 642 0.001 754 1.75 0.02 142 0.24 0.0001 0.017 66 0.02 LGSC 327/1986 77.25 4 8 1630 1230 LGSC 429!1%fi d4.05 8 B.7 1220 1040 LGSC 5G0/i%fi 25.69 74 B 7440 235 LGSC 6/17/1988 16.51 8.4 76 1550 8.7 7fi50 1340 128 fi.46 0.02 D.OB 355 675 0.001 751 0.55 0.02 752 O.OB 0.0002 0.016 EO 0.01 LGSC 70/7986 11.25 8.3 76 1575 LGSC 724!1986 7.15 8 16 1700 7.9 i6% 52 LGSC 8/d/19% 5.53 8.5 76 1700 B 1670 1464 40 8.15 0.02 0.00 352 757 0.001 743 0.16 0.02 174 0.03 0.0002 0.019 73 0.01 LGSC 9/10/1986 5.38 8.1 8 1700 LGSC 925/19% 5.2 7.6 7 5740 7.9 172D 18 LGSC 70/73/19% 6.38 8 6 1850 B.t 1850 1546 104 7.4 0.02 0.13 385 807 0.001 152 0.56 0.02 177 0.12 0.0002 0.077 82 0.02 LGSC 7125/19% 5.36 7 7.7 1870 30 LGSC 17/31/19% 3.77 0.5 8 7920 36 LGSC 7117/1%7 4.Sd 2 8.2 7710 7438 3B 7.48 0.% 0.09 38fi 71fi 0.001 183 0.34 0.02 174 0.14 0.0002 0.079 BB 0.07 LGSC 324/1%7 6.05 7.9 1830 58 LGSC 5/1/1%7 78.6 12 7.9 1080 970 LGSC 8211987 6.% 11 7.8 1600 1148 94 5.22 0.02 0.08 340 fi03 0.001 149 0.57 0.02 140 0.1 0.0002 0.074 50 0.07 Lcsc s/a1%7 sss it LGSC 6/18!1%7 5.03 B 20 76% LGSC 720/1%7 3.77 7.1 78 1675 7.8 1840 2fi LGSC &18/1%7 3.48 7.4 20 1850 B.3 1710 1470 22 6.75 0.04 0.07 328 875 0.001 134 0.17 0.02 183 0.05 0.0002 0.018 B1 0.01 LGSC 9/14/1%7 3.40 7.4 72 1875 7.9 1840 6 LGSC 1021/1987 2.39 7.4 70 1%0 7.9 1830 7434 76 6.09 0.02 0.04 359 794 0.001 145 0.23 0.02 170 0.08 0.0002 0013 % 0.01 LGSC 1125/1987 4.07 2 7.7 7950 72 LGSC 12(21N987 4.07 0 7.8 1770 56 LGSC 7/1/1988 1.8 7.8 15% 13% 72 6.30 0.03 0.06 365 731 0.001 169 0.03 0.02 758 0.04 0.0002 0.008 69 0.01 LGSC 3/7/1988 4.38 7.8 1600 36 LGSC 3131/1908 5.36 1d20 7.9 1410 1356 28 5,74 0.08 O.Od 371 710 0.001 165 0.26 0.02 750 0.09 0.0002 O.OOd 67 0.07 LGSC 420/1988 8.31 7.B 1410 720 CF 17.14 2004 32200510:03 AM LGSC04.xls