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[ol ouyo Coal Company 02/11/98 Page 1 COLOYYO MINE Station: GOSSARD YELL Sample Range: Through 12/31/97 Std Coef Maximum Minimum Max Value Min Value # of Mean Dev Var Range Value Value Found Found Same FIELD MEASUREMENTS Field pH (S.U.) 7.53 8.30 7.00 06/01/93 06/27/88 49 Field Temperature (deg C) 10.7 3.0 28 16. 0 20.0 4.0 08/15/BB 11/24/92 64 Field Conductivity (umho/cm) 1742 191 11 838 2200 1362 11/25/96 03/19/97 46 LABORATORY MEASUREMENTS pN (Lab) (S.U.) 7.84 8.60 7.30 08/19/91 10/19/83 60 CoMuctivity (Lab) (umho/cm) 1775 173 10 860 2220 1360 10/17(91 03(24/85 60 TDS (180 deg C) (mg/l) 1219 113 9 668 1630 962 05/23/95 03/13/93 60 Phosphate as P (mg/l) 0.172 0.241 140 0. 995 1.000 0.005 03/27/86 08/23/93 59 Bicarbonate as CaC03 (mg/l) 455.32 57.17 13 511. 00 756.00 245.00 05/20/97 10/13/86 59 Sulfate (mg/l) 444.85 75.28 17 416. 00 780.00 364.00 05/23/95 03/29/85 59 Ammonia Nitrogen as N (mg/l) 0.08 0.07 B1 0. 34 0.35 0.01 12/28/89 09/13/95 59 Nitrate + Nitrite es N (mg/l) 0.85 0.48 57 2 .89 2.90 0.01 03114/84 12/05/95 54 Nitrate as N (mg/l) 1.49 4.71 316 34 .68 34.70 0.02 08/14/97 10/27/83 52 Nitrite as N (mg/l) 0.02 0.03 128 0 .13 0.14 0.01 10/12/88 06/19/87 47 Arsenic (mg/l) 0.002 0.001 82 0.006 0.007 0.001 08/01/89 06/29/85 59 Calcium (mg/l) 96.19 19.86 21 158. 00 170.00 12.00 05/23/95 11/30/93 59 Iron (mg/t) 1.845 4.558 247 28. 990 29.000 0.010 11/19/90 11/18/94 58 Lead (mg/l) 0.034 0.038 112 0 .230 0.250 0.020 10/04/89 10/27/83 59 Magnesium (nl9/l) 116.441 20.314 17 157 .000 172.000 15.OOD 05/23/95 11/30/93 59 Manganese (nlq/l) 0.069 0.162 235 1 .035 1.040 0.005 05/23/95 11/18/94 59 Mercury (mg/l) 0.00039 0.00129 330 0. 00990 0.01000 0.00010 06/01/93 06/27/88 59 Selenium (mg/l) 0.003 0.002 56 0. 007 0.008 0.001 12/05/95 10/13/86 59 Sodium (mg/l) 154.76 27.26 18 181 .00 200.00 14.00 03!27190 11130/93 59 Zinc (mg/l) 0.079 0.099 126 0 .450 0.460 0.010 09/18/85 03/28/91 59