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Colo~yo Coal Company 02/11/98 Page 7 COLONYO MINE Station: A-6 Sample Range: Through 12/31/97 Std Coef Maximum Minimum Max Value Min Value # of Neen Dev Var Range Value Value Found Found Samp FIELD MEASUREMENTS Field pH (S.U.) 7.39 9. 10 7.00 11/18/97 08/23/93 20 Field Temperature (deg C) 8.4 2.8 33 11.9 14. 9 3.0 08/01/84 11/01/84 27 Field Conductivity (unho/cm) 1096 101 9 525 1448 923 02/20/96 09/26/96 19 LABORATORY MEASUREMENTS pH (Lab) (S.U.) 7.47 8. 60 7.30 11/30/93 06/01/93 27 Conductivity (Lab) (umho/cm) 1116 48 9 445 1440 995 05105/85 02/20/96 27 TDS (180 deg C) (mg/L) 675 93 14 490 910 420 05/01/85 03/13/93 27 Phosphate as P (mg/l) 0.049 0.097 184 0.478 0 .483 0.005 02/20/96 17/30/93 27 Bicarbonate as CaC03 (ng/l) 485.37 96.88 20 532.00 544 .00 12.00 03/21/94 06/07/94 27 Sulfate (m5/l) 145.85 57.84 40 180.00 280 .00 100.00 05/01/85 04!15/96 27 Ammonia Nitrogen es N (mg/() 1.40 0.34 24 1.58 1 .76 0.18 08/23/93 17/18/97 22 Nitrate + Nitrite as N (mg/t) 0.73 1.05 144 2.78 2 .80 0.02 17/19/96 08/19/92 14 Nitrate as N (m(9/l) 0.38 0.76 200 2.78 2 .80 0.02 71/19/96 08/79/92 21 Nitrite as N (al9/l) 0.01 0.00 0 0.00 0 .01 0.01 08/19/92 08/19/92 22 Arsenic (m9lt) 0.001 0.000 33 0.001 0 .002 0.001 08/01/84 05/01/85 27 Calcium (mg/t) 67.09 24.47 36 118.00 769 .00 51.00 11/78/97 08/19/92 27 Iron (mg/t) 1.270 0.830 65 3.550 3 .560 0.010 08/79/92 11/78/97 26 Lead (mg/l) 0.023 0.008 33 0.020 0 .040 0.020 02/26/97 08/19/92 23 Magnesium (mg/l) 59.426 24.730 42 127.000 169 .000 42.000 11/18/97 08/19!42 27 Manganese (mg/L) 0.053 0.031 59 0.130 0 .160 0.030 08/01/84 11/24/92 27 Mercury (mg/l) 0.00023 0.00012 52 0.00040 0 .00050 0.00070 08/01/84 08/19/92 27 Selenium (mg/l) 0.002 0.002 87 0.006 0 .007 0.001 02/26/97 08/19/92 27 Sodium (mg/l) 117.82 12.62 11 43.80 134 .00 90.20 09/26/96 11/18/97 27 Zinc (mg/l) 0.018 0.020 114 0.095 0 .100 0.005 03/13/93 02/01/85 27