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<br /> MINREC, INC., NORTH THOMPSON CREEK MINES <br />NO. 1 MINE DLSCHARGE <br />Date <br />Parameter Units 6/28/89 10/05/89 6!1/90 6/19/91 6/04/92 6/01/93 10/1/94 6(26/95 6/4/96 MIN MAX AV <br />pH su 8.1 7.5 8.0 8.2 8.1 8.1 8.0 7.9 7.6 7.5 8.2 7.9 <br />Conductivity tunhos/cm 3900 3300 3000 2800 2600 2400 2300 3200 2200 2200 3900 2856 <br />Temperature °C 18 13 17 14 16 17 10 16 15 10 18 15 <br />TDS mg/1 mg/1 2065 2020 2110 1925 1655 1755 1530 1975 1520 1520 2110 1839 <br />TSS mg/I <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <]0 <br />Bicarbonate mgll 945.0 939.0 980.0 942.0 772.2 910.1 716.0 940.0 727.2 716.0 980.0 874.6 <br />Calcium mg/1 382.0 390.1 402.2 386.2 267.0 316.0 290.1 390.4 291.6 267.0 402.2 346.2 <br />Chloride mg/I 76.0 68.1 72.4 60.8 78.8 50.4 61.4 61.4 50.6 50.4 78.8 64.4 <br />Copper mg/I 0.017 0.015 0.011 0.011 0.100 0.026 O.OIS 0.020 0.099 O.OII 0.100 0.035 <br />Iron mg/I-Pd 0.49 0.59 0.31 0.68 0.52 0.41 O.14 0.13 0.20 0.13 O.b8 0.39 <br />Magnesium mg/I 56.2 54.0 56.2 42.2 52.0 39.8 30.6 50.8 49.2 30.6 56.2 47.9 <br />Manganese mg/t 0.34 0.39 0.20 O.19 0.40 0.20 0.09 0.20 0.16 0.09 0.40 0.24 <br />Sodium mg/I 165.0 161.5 182.4 161.4 121.4 142.6 121.7 170.8 131.4 121.4 182.4 150.9 <br />Sulfate mg/I 390.0 401.0 420.2 360.2 308.8 339.2 304.6 374.4 272.8 272.8 420.2 352.4 <br />Zinc mgll 0.181 0.180 0.188 0.168 0.32 0.204 0.09 0.17 0.124 0.090 0.320 0.181 <br />Beginning April L994 Iron is measured as potrntially dissolved. <br />