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Enviro-Chem Analytical, Inc. <br />685 West Gunnison Avenue, Suite 108 <br />Grand Junction, CO 81505 <br />Chronic Toxicity Test <br />West Elk Mine - April 2008 <br />2 species <br />Outfall 001 <br />TABLE 2. Initial Chemistry Ranges for Fathead Minnow and Daphnia magna <br />96-hour and 48-hour Acute Toxicity Tests Conducted with <br />West Elk Mine Effluent - Test Dates April 15-19, 2008 <br />Daphnia magna <br />Effluent Conc. <br />N <br />pH D.O. <br />(mg/L) Temperature <br />(C) Conductivity <br />(umhos/cm) Alkalinity <br />(mg/L) Hardness <br />(mg/L CaC03) <br />MHW Control 8.563 8.1 20 2650 975.24 358.6 <br />6.50% 8.555 8.2 20 2865 NM NM <br />13.00% 8.478 8.5 20 2690 NM NM <br />25.00% 8.418 9 20 2710 NM NM <br />50.00% 8.376 9.6 20 2740 NM NM <br />100.00% 8.259 10.3 20 L 2860 1480.92 49.6 <br />NM = Not Measured <br />Ettluent C-onc <br />(%) <br />pH U-0. <br />(mg/L) Temperature <br />(C) Conductivity <br />(umhos/cm) Alkalinity <br />(mg/L) Hardness <br />(mg/L CaC03) <br />MHW Control 8.136 8.1 20 315 46.96 101.25 <br />6.50% 8.237 8.1 20 587 NM NM <br />13.00% 8.226 8.2 20 870 NM NM <br />25.00% 8.261 8.6 20 1544 NM NM <br />50.00% 8.256 8.6 20 2040 NM NM <br />100.00% 8.259 10.3 20 L 2860 1480.92 49.6 <br />NM = Not Measured