REP45377

• Permit No: C1981019
• IBM Index Class Name: Report
• Doc Date: 3/16/2005
• Doc Name: 2004 AHR Section 2
• From: Colowyo Coal Company L.P.
• To: DMG
• Annual Report Year: 2004
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

Colowyo Coal Company, L.P.
Water Guality Data
'1982-2004
Lower Good Spring Creek
COLOWVO MINE
LGSC (LGSC)
Listing N Stream Lab Data
Flow Field Fieltl Field Lab Lab TDS NO3 NO2 NO3+NO2 NH3 Total Bicarb Ambig. SW Ambig. SW Ambig. SA Ambig. SM Ambig. SN Ambig. SN Ambig. SN Ambig. SN Ambig. SN Ambig. SW
No datum => Blank Rate pH Tamp Conduct pH Conduct -180 TSS as N as N as N as N P as CaCO3 Sulfate As Ca F¢ Pb Mg Mn Hg Se Na Zn
c6 S.U. degC umhWcm S.U. umholcm mg4 mgll mg4 mg4 mg/I mg4 mg/I mgA mgll mg/I mgll mg/I mg/I mg/I mg/I mg/I mgll mg/l mgll
Statistics
Mean 4.28 B.% 9.43 7651.77 8.00 1697.39 133752 6fi.38 1.42 0.01 2.54 0.12 006 398.69 661 d0 000 142.17 0.60 0.03 147.67 0.12 0.00 0.07 72.19 0.02
Std. Dev. 5.50 0.42 6.05 377.23 0.23 321.53 360.44 268.45 0.82 0.01 2.28 0.24 0.07 77.25 16058 0.00 25.47 0.63 0.03 28.87 0.06 0.00 0.00 2593 0.03
Ccef. Var.
Range 46.94 4.7 25.6 2160 2.4 2659 3330 3698 3.77 0.04 7.99 2.25 0495 572 685 0.0174 740 4.24 0.199 149.4 0.315 0.0009 0.029 74d.3 0.795
Max 47 9.3 25 2900 8.5 2820 4050 3700 4.1 0.05 8.29 2.26 0.5 fi02 945 0.078 208 4.27 0.2 226 0.32 0.001 0.03 1fi4 0.2
Min 0.06 A.6 -06 740 6.1 1fii 720 2 0.33 0.07 0.3 0.01 0005 30 260 0.0006 fib 0.03 0.001 7fi.6 D.005 0.0001 0001 19.7 0.005
Max at 4/27/1%B 11/1811997 7rzC/1982 1013/1996 8/19/ 1991 1/79/7993 71/82000 4130/1%5 1228/1989 5/7/2001 12/26/1985 12/74/1%9 7n/1%9 70242002 17/4/1989 4n/1982 72/28/7989 427/1%8 9772001 12/4/1989 4/7/1982 7/762004 1 014/7%9 7 0/&1998 1grz2000
Min at 11/6/1999 7/82002 77J18/199fi 4/52002 91d/ 1997 623/7992 523/7995 9/30/1994 8/102004 71/12004 8/17/1992 0/7Orz004 9/17/1997 914/1992 520/1997 11/12004 3/73/1984 2/1H%8 11/52001 52011997 7131/2000 6/1/1%3 920/2007 4/77!1000 628/1985
#OfSamples 257 201 2d7 201 282 266 127 279 41 37 92 % 97 107 107 107 740 774 107 141 105 107 1W 709 107
Station Sample Flow Field Field Field Leb Lab TDS NO3 NO2 NO3*NO2 NH3 Total Bicarb Ambig. SMI Ambig. SW Ambig. SN Ambig. SN Ambig. SM Ambig. SM Ambig. SV~Ambig. SM Amblg. 5d Ambig. SW
Name Date Rate pH Temp Conduct pH Conduct -180 TSS as N as N as N as N P as CaCO3 Sulfate As Ca Fe Pb Mg Mn Hg S¢ Na Zn
cfs S.U. degC umhNCm S.U. umho/cm mgB mgll mgll mg8 mgll mg8 mg/I mgB mg8 mg4 mg/I mg/I mg/I mg4 mg8 mg/I mgll mgB mg4
LGSC 9/71/7997 2.75 B.2 156 7341 B3 1620 1220 30 1.69 0.01 1.69 0.1 0.005 405 560 0.001 727 1.56 0.04 728 0.166 0.0002 0.008 64.7 0.02
LGSC tOr30/1%7 0.39 7.4 3.9 1656 B.1 1490 28
LGSC 11/18/1997 1.8 9.3 5 7343 8.7 7660 1180 62 2.75 0.01 2.15 0.07 0.07 457 570 0.001 144 1.54 0.04 137 0.135 0.0002 0007 64.8 0.04
LGSC 11/8/1%7 1.4 B 2 1778 8.2 1650 5
LGSC 1/6/1998 2.4 8 0.3 1890 8 1880 1410 5 7.85 0.07 7.86 0.% 0.18 524 630 0.001 735 0.17 0.04 138 0.151 0.0002 0.007 706 0.01
LGSC 7/19/7998 2.4 B.7 1800 8.1 7790 5
LGSC 3/6/1998 3 6.3 7850 B.7 7800 5
LGSC d/9/19% 78 81 7440 B.2 7450 22
LGSC 4rz7/7998 47 7962 Sd 1170 780 172 1.77 0.05 0.27 336 293 0.005 113 4.27 0.02 78.6 0.16 0.001 0.005 .30.9 0.07
LGSC 6/71/7998 6.6 8.6 6.7 1553 8.2 7370 774
LGSC 7/fi/19% 5 0.4 21 1589 8.3 1520 67
LGSC &3/19% 3 B.4 14 1709 8.1 1550 1280 52 3.96 0.05 0.05 414 559 0.005 158 1.19 0.02 909 0.02 0.007 0.07 595 0.01
LGSC 9/10/1998 0.66 B.4 758 79% 8 1770 54
LGSC 10/8/1%B 2.8 8.4 12 7203 B.4 1740 1490 24 8.84 0.09 005 270 631 0.005 149 0.53 0.02 124 0.02 0.001 0.006 732 0.01
LGSC 11/5/1998 0.5 8.6 9 2018 7.B 1840 10
LGSC 72/14/1998 0.5 8.3 5.11 2216 7.B 7920 48
LGSC 7n/1999 8.5 5.5 21% 8.2 7870 1460 13 3.48 0.05 0.5 d65 fi0fi 0.005 147 0.5 0.02 176 0.001 0.01 700 0.01
LGSC 727/1999 0.3 B.6 4.5 1990 7.9 1890 7
LGSC 331999 0.28 B.6 fi 1245 7.9 1720 5
LGSC 4/fi/7999 4.7 8.23 1894 7.9 1720 6
LGSC 5/17/1999 17 8.d1 0.4 872 B.2 1250 920 32 2.W 0.05 0.08 346 355 0.005 10fi 1.01 0.02 88.4 0.08 0.001 0.007 42.3 0.01
LGSC 6/10/1999 8.71 8.2 9.A 1492 8 7420 70
LGSC 7/fi~1999 3.77 8.18 20.2 15fi9 7.9 7620 1270 % 284 0.05 0.15 356 515 0.005 97.7 7.5 0.02 113 0.02 0.001 0.07 56.3 0.01
LGSC &19/7999 2.5 B.% 73.4 1791 7.8 7640 24
LGSC 9/3/19% 3.62 8.16 74.4 1390 8 1720 28
LGSC 70/1&1999 292 B 6.8 1342 6.1 1920 762(1 10 2.OB 0.05 0.12 494 684 0.005 %.7 0.31 0.02 163 0.02 0.001 0.009 129 0.01
LGSC 71/11/1999 292 8.1 7.5 7097 7.9 18&1 5
LGSC 17/6/1999 0.08 B.% 7.2 7758 7.6 7850 16
LGSC 1nrzOlH1 2.39 8.12 1.2 7080 7.7 1820 5
LGSC 7n2000 2.39 8.14 2.1 1106 7.8 7780 1500 fi 7.10 0.05 0.05 440 636 0.005 tOd 0.19 0.02 142 0.02 0.001 0.017 903 0.01
LGSC 322000 3.2 8.23 4.8 1157 7.7 1730 6
LGSC 4H7f2000 5.03 8.21 10 1738 7.8 1550 7210 33 2.04 0.05 0.52 373 531 0.005 %.4 0.76 0.02 126 0.02 0.001 0008 197 0.01
LGSC 6/52W0 2.65 8.15 19.3 1497 7.8 1570 %
LGSC 7/3/2000 2.2 8.22 74A 7862 7.6 1700 86
LGSC 7312000 1.28 8.17 17.8 1927 7.6 7730 1420 32 1.81 0.05 0.05 d46 622 0.005 123 0.67 0.005 153 0.005 0.0002 0.018 %.9 0.2
CF 17.14 2004
LGSC04.%IS 32200510:03 AM