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COLOWYO MINE Page 1 SCation: LTC Sample Aange: Through 12/31/01 _ Std Coef Maximum Minimum Max Value Min Value # of Mean Dev Var Range Valu e Valu e Found Found Samp FIELD MEASUREMENTS Field gH (S. U.) 8. 19 9. 30 7. 40 OB/12 /83 06/28/85 90 Field Temperature (deg C) 10. 7 6. 4 60 25. 1 25. 0 -0. 1 06 /18 /B7 11/11/99 96 Field Conductivity (umho/cm) 1639 421 26 2769 3580 811 03/06/98 05/19/91 88 LABORATORY MEASUREMENTS pH (Lab) (S.U.1 7. 98 B. fi0 7. 00 10/05/89 02/22/89 131 Conductivity (Lab) (umho /cm) 1599 934 27 3370 3570 200 03/06/98 02/28/90 131 TDS (180 deg C) (mg/1) 1128 356 32 1786 1930 144 10/05/89 02/25/90 59 Total Suspended Solids (mg/11 463, 3 2043. 0 441 20582. 0 20584. 0 2. 0 03/01/Be it/30/88 131 Phosphate as P (mg/11 3, 794 24. 934 657 184. 998 155. 000 0. 003 03/31/88 09/13/95 SS Bicarbonate ae CaCO3 lmg/1) 302 ,67 83. 35 20 400. 00 467. 00 67. 00 11/18/97 02/05/01 55 Sulfate (mg/1) 512. 25 211. 36 41 1109. 00 1128. 00 19. 00 10/05/59 02/28/90 SS Ammonia Nitrogen as N (mg/1) 0 .07 O. OB 111 0. 37 0. 38 0. 01 02/05/01 06/15/83 48 Nitrate + Nitrite as N (mg/1) 1. 45 1. 45 100 9. 95 4. 95 0. 01 06/28/85 02/07/00 47 Arsenic (mg/1) 0 .002 0. 009 176 0. 028 0. 028 0. 001 03/01/88 05/31/85 55 Calcium (mg/1) 91. 70 25. 35 2B 108. 20 134. 00 25. 80 Oa/24 /86 02/05/01 56 Iron (mg/1) 4. 944 10. 671 378 131. 995 132. 000 0. 005 02/28/90 09/13/95 59 Lead (mg/11 0 .028 0. 049 179 0. 290 0. 300 0. 010 02/28/90 06/15/83 56 MagneslLLm (mg/1) 118. 465 44. 601 38 230. 000 238. 000 8. 000 10/12/88 02/2 B/90 52 Manganese (mg/1) 0 .378 1 .241 328 7. 847 7. 850 0. 003 03 /01/88 09/13/95 54 Mercury Img/1) 0. 00026 0. 00027 106 0. 00095 0. 00100 0. 00005 08/13/84 02/24/86 55 Selenium (mg/11 0 .004 0. 004 B2 0. 016 0. 016 0. 001 OB /13 /84 11/09/90 55 Sodium !mg/1) 92. 79 36. 07 39 168. 00 174. 00 6. 00 10/OS/B9 02/28/90 SS Zinc (mg/1) 0 .058 0. 142 245 0. 798 0. 800 0. 003 02/28/90 06/15/83 55 Below detection limit values included at 0.5 times detection limit