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MINREC, INC., NORTH THOMPSON CREEK MINES OUTFACE 001 DISCHARGE Date Parameter Unirs 06/28/89 ]0/05/89 6!7/1990 6/19/91 6fl14/92 6/OIN3 10!794 6/26N5 6/4/96 116/17/97 06Y22N8 06/29N9 07/19/00 116/18/01 06/10/02 06/27/03 MIN MAX AVO pH su 8.1 7.5 8.0 8.2 8.1 8.1 8.0 7.9 7.6 7.5 7.3 7.6 8.2 8.2 8.2 7.7 7.3 8.2 7.9 Conductivi umhas/c 3900 3300 3000 2800 2600 210(1 2300 3200 2200 1960 1800 1570 1720 1950 1890 2130 1570 3900 2420 Te acetate °C 18 13 17 14 16 17 10 16 15 16.5 16.7 17.6 17.9 15.3 16.5 15.5 10 18 16 TDS mg/I mgA 2065 2020 2110 1925 1655 1755 1530 1975 1520 1295 1455 1385 1340 1372 1366 1555 1295 2110 1645 TSS mg/I <10 <10 <10 <10 <10 <l0 <10 <10 <10 <10 <10 <10 d0 <]0 QO <10 <10 <10 <10 Bicarbonate m 945.0 939.0 980.0 942.0 772.2 910.1 716.0 940.0 727.2 610.0 701.4 667.2 64b.0 658.4 650.0 716.0 610.0 980.0 782.5 Calcimn mg/1 382.0 390.1 402.2 386.2 267.0 316.0 290.1 390.4 291.6 250.2 282.4 270.1 262.2 268.2 266.0 294.4 250.2 402.2 313.1 Chloride mg/1 76.0 68.I 72.4 60.6 78.8 50.4 61.4 61.4 50.6 44.8 48,4 44.0 44.4 40.2 41.6 50.4 40.2 78.8 55.9 Co er mgA 0.017 0.015 0.011 0.011 0.100 0.026 0.018 0.020 0.099 0.088 0.091 0.100 0.101 0.100 0.1170 0.100 0.011 0.101 0.062 Iron m -Pd 0.49 0.59 0.31 0.6R 0.52 0.41 0.14 0.13 0.20 0.18 0.22 0.23 0.21 0.23 0.07 0.03 0.03 0.68 0.29 Magnesium mg/1 56.2 54.0 56.2 42.2 52.0 39.8 30.6 50.8 49.2 41.8 46.0 44.2 40.0 42.0 41.2 60.6 30.6 60.6 46.7 Manganese mg/1 0.34 0.39 0.20 0.19 0.40 0.20 0.09 0.20 0.16 0.12 0.10 0.11 0.11 0.12 0.11 0.02 0.02 0.40 0.18 Sodium mgA 165.0 161.5 182.4 161.4 121.4 142.6 121.7 170.8 131.4 110.7 122,8 120.0 116.6 120.8 121.6 145.2 110.7 182.4 138.5 Sulfate m 390.0 401.0 420.2 360.2 308.8 339.2 301.6 374.4 272.8 236.1 257,2 250.1 238.b 244.2 241.8 270.8 236.1 420.2 306.9 Zinc mg/1 0.181 0.180 0.188 0.168 0.32 0.204 0.09 0.17 0.12! 0.101 0.11 O.IOI 0.1 0.1 0.1 0.02 0.020 0.320 0.141 Beginning Apri11994Iron is measured as potemially dissolved.