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COLOWYO MINE Page 1 <br />Btatlen: NGSW <br />Sample Range: Through 12/31/01 <br /> Std Coe£ Maxi mum Mini mum Max Value Min Value # of <br /> Mean Dev Var Range Value Val ue Found Found Samp <br />FIELD MEASUREMENTS <br />Field pH (B. U.) 7. 59 8. 70 7. 18 11/18/97 10/13/99 38 <br />Field Temperature (deg C~ 9. 5 3. 1 3Z 14. 0 18. 0 4. 0 07/06/98 11/30/93 93 <br />Piald Conductivity (u mho/cm) 1722 377 22 1984 2200 216 02/19/98 10/O1/O1 37 <br />LABORATORY MEASUAEMENTS <br />pH (Lab) 45.U.) 7 .58 8. 50 6. 80 08/19/91 10/03/00 51 <br />Conductivity (Labl (O mhO /cm) 1883 290 15 1550 2700 1150 10/17/91 04/27/98 51 <br />TDB (180 deg C) (mg/1) 1495 253 17 1096 1876 780 05/30/90 04/27/98 51 <br />Phosphate as P Img/1) 0 .043 0 .045 106 0. 298 0. 300 0. 003 11/19/96 11/30/93 50 <br />Bicarbonate as CaC03 (mg/ll 458 .16 83 .77 28 578. 00 590. 00 12. 00 08/14/97 06/01/94 51 <br />Sulfate (mg/1) 727 .31 176 .73 24 898. 00 1185. 00 287. 00 08/19/91 04/27/98 51 <br />Ammonia Nitzogen as N (mg/1) D .20 0 .13 66 0. 52 0. 54 0. 03 11/19/96 03/27/90 50 <br />Nitrate a Nitrite as N (mg/11 0 .13 0 .31 233 1. 61 1. 61 0. 01 04/27/98 09/05/89 30 <br />Nitrate as N (mg/11 0 .14 0 .19 130 0, 72 0, 73 0. 01 03/13/93 09/05/89 39 <br />Nitrite as N ~ (mg/1) 0 .01 0 .01 87 O. D2 0. 03 0. 01 02/05/01 09/05/89 31 <br />Arsenic (mg/1} 0 ,003 0 .005 216 0. 040 0. 040 0. 001 10/O1/O1 10/05/89 51 <br />Calcium (mg/1) 158 .32 31 .34 20 130. 30 223. 00 ~ 92. 70 03/27/90 10/08/98 51 <br />Iran (mg/1) 0 .572 0 .728 127 3. 985 3. 990 0. 005 04/27/98 11/10/97 50 <br />Lead lmg/1) 0 .020 0 .022 119 0. 090 0. 100 0. 010 02/05/01 09 /OS /B9 51 <br />Magnesium (mg/1) 155 .83 31 .14 20 159. 00 230. 00 76. 00 03/27/90 04/27/98 51 <br />Manganese (mg/1) 0 .507 0 .302 60 1. 298 1. 300 0. 003 05/23/95 11/18/97 51 <br />Mercury (mg/1) 0 .00020 0 .00018 91 0. 00045 0. 00050 0. 00005 04/27/98 09/05/89 51 <br />Selenium (mg/1) 0 .002 0 .002 114 0. 010 0. 010 0. 001 11/24/92 12/28/89 51 <br />Sodium (mg/11 81 .48 18 .39 23 140. 30 172. 00 31. 70 11/18/97 04/27/98 51 <br />Zinc (mg/1) 0 .023 0 .034 149 0. 155 0. 160 0. 005 09/05/89 11/19/90 51 <br />Below detection limit values included at 0.5 times detection limit <br />