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COLOWYO MINE Page 1 <br />Station: A-6 <br />Sample Range: Through 12/31/01 - - <br /> Std Coef Max imum Min imum Max Value Min Value # of <br /> Mean Dev Var Ra nge Va lue Va lue Found Found Samp <br />FIELD MEASUREMENTS <br />Field pH (S.U.) 7 .99 9 .10 7 .00 11/18/97 08/23/93 39 <br />Field Temperature (deg CI 9 .2 3 .5 38 16 .0 19 .0 3 .0 07/17/O1 11/01/84 39 <br />Field Conductivity (um ho /cm) 1088 218 20 1241 2000 759 02/19/98 02/07/00 33 <br />LABORATORY MEASUREMENTS <br />pH (Lab) (S.U.) 7 .4fi 8 .60 7 .00 11/30/93 10/03/00 42 <br />Conductivity (Lab) (um ho/em) 1104 90 8 510 1440 930 05/01/85 04/27/98 92 <br />TDS (180 deg C) (mg/1) 684 06 13 510 930 420 07/17/01 03/13/93 42 <br />Phosphate as P (mg/1) 0 .042 0 .074 178 0 .481 0 .483 0 .003 02/20/96 11/30/93 42 <br />Bicarbonate as CaCO3 (mg/1) 484 .79 90 .00 19 532 .00 544 .00 12. 00 03/21/94 06/01/94 42 <br />Sulfate (mg/1) 143 .98 67 .00 47 334 .20 430 .00 95 .80 07/17/01 OS/IS/00 92 <br />Anvnonia Nitrogen as N (mg/1) 1 .31 0 .57 43 3 .13 3 .15 0 .03 05/15/00 04/27/98 37 <br />Nitrate + Nitrite as N (mg/1) 0 .49 0 .82 168 2 .80 2 .80 0. 01 11/19/96 07/06/98 29 <br />Nibate as N (mg/1) 0 .39 0 .73 18fi 2 .79 2 .80 0. 01 11/19/96 08/19/92 25 <br />Nitrite as N (mg/11 0. 01 0. 01 85 0 .02 0. 03 0. 01 02/05/01 08/19/92 26 <br />Arsenic (mg/1I 0 .001 0. 001 64 0 .002 0. 003 0. 001 04/27/98 08/19/92 41 <br />Calcium (mg/1) 65 .16 22 .57 35 121 .10 169. 00 97. 90 11/18/97 07/31/00 42 <br />Iron (mg/1) 1. 977 5. 363 271 32. 995 33. 000 0. 005 05/17/99 11/18/97 41 <br />Lead (mg/1) 0 .018 0. 024 133 0 .090 0. 100 0. 010 02/05/01 08/19/92 38 <br />Magnesium (mg/1) 57. 15 21. 18 37 127. 00 169. 00 42. 00 11/18/97 08/19/92 42 <br />Manganese (mg/11 0. 045 0. 028 62 0. 150 0. 160 0. 010 08/01/84 04/27/90 42 <br />Mercury (mg/11 0. 00027 0. 00020 75 0. 0009 5 0. 00050 0. 00005 08/01/84 08/19/92 41 <br />Selenium (mg/1) 0. 002 0. 002 79 0. 007 0. 007 0. 001 02/26/97 08/19/92 91 <br />Sodium (mg/1) 116. 79 21. 78 19 121. 10 139. 00 17. 90 10/13/99 04/27/98 42 <br />Zinc (mg/1) 0. 015 0. 023 154 0. 105 0. 110 0. 005 07/17/01 02/O1/BS 42 <br />Below detection limit values included at 0.5 times detection limit <br />