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:: <br />'r- -- - -- ----- - - - - - - <br />~ Enviro-Chem Analytical, Inc. Chronic Toxicity Test <br />685 West Gunnison Avenue, Suite 108 West Elk Mine -Oct 2007 <br />Grand Junction, CO 81505 2 species <br />Outfall 017 <br />TABLE 2. Initial Chemistry Ranges for Fathead Minnow <br />96-hour Acute Toxicity Tests Conducted with <br />West Elk Mine Effluent -Test Dates Oct. 23-27, 2007 <br />Effluent Conc. <br />(%) <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 7.96 9.9 20 290 79.8 80.5 <br />6.50% 8.06 10.6 20 560 NM NM <br />13.00% 8.12 10.6 20 680 NM NM <br />25.00% 8.16 10.7 20 950 N M N M <br />50.00% 8.39 11.9 20 1640 N M N M <br />100.00% 8.51 13.4 20 4020 1629 31.56 <br />NM =Not Measured <br />