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Colo~yo Coal Company 02/11/98 Page 1 COLONYO MINE Station: NGSN Sample Range: Through 12/31/97 Std Coef Maximum Minimum Max Yalue Min Value it of Mean Dev Var Range Value Value Found Found Samp FIELD MEASUREMENTS Field pH (S.U.) 7.53 8.70 7.20 11/18/97 05/30/90 24 Field Temperature (deg C) 9.2 2.9 31 11.0 15.0 4.0 05/17/91 11/30/93 31 Field Conduce every (umholcm) 1889 584 1D 663 2180 1517 07/19/90 05/20/97 23 LABORATORY MEASUREMENTS pH (Lab) ~ (S.U.) 7.62 8.50 7.20 08/19/91 09/05/89 36 Conductivity (Lab) (umho/cm) 1982 235 12 1140 2700 1560 10!17/91 03/13/93 36 TDS (180 deg C) (mg/l) 1578 187 12 804 1876 1072 05/30/90 03/13/93 36 Phosphate as P (mg/l) 0.047 0.052 110 0.295 0.300 0.005 11/19/96 11/30/93 35 Bicarbonate es CaC03 (mg/l) 459.44 94.33 21 578.00 590.00 12.00 08/14/97 06/01/94 36 Sulfate (mg/l) 798.56 121.24 15 685.00 1185.00 500.00 08/19/91 11/18/97 36 Aamonia Nitrogen as N (mg/l) 0.24 0.13 55 0.49 0.54 0.05 11/19/96 03/27/90 35 Nitrate t Nitrite as N (mg/l) 0.10 0.16 165 0.64 0.65 0.01 11/18/97 09/05/89 15 Nitrate as N <mg/l) 0.15 0.20 133 0.71 0.73 0.02 03/13/93 09/05/89 34 Nitrite as N (mg/l) 0.01 0.00 0 0.00 0.01 0.01 09/05/89 09/05/89 26 Arsenic (mg/l) 0.002 0.001 62 0.004 0.005 0.001 08719/92 10105!89 36 Calcium (mg/L) 168.71 26.14 15 123.60 223.00 99.40 03/27/90 11/18/97 36 Iron (mg/l) 0.632 0.570 90 2.100 2.110 0.010 05/14/92 11/18/97 35 Lead (mg/l) 0.026 0.013 50 0.060 0.080 0.020 08/14/97 09/05/89 36 Magnesium (mg/l) 166.194 24.207 15 113.000 230.000 117.000 03/27/90 10/05/89 36 Manganese (mg/I) 0.541 0.296 55 1.295 1.300 0.005 05/23/95 11/18/97 36 Mercury (m(9/t) 0.00016 0.00005 31 0.0001 0 0.00020 0.00010 03/28/91 09/05/89 36 Selenium (mg/t) 0.002 0.002 109 0.009 0.010 0.001 11/24/92 12/28/89 36 Sodium (mg/l) 84.18 18.54 22 115.00 172.00 57.00 11/18/97 06/01/93 36 Zinc (mg/l) 0.030 0.037 125 0.150 0.166 0.010 09)05/B9 11/19/90 36