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Enviro -Chem Analytical, Inc <br />2493 Hwy 6 Unit 7 <br />Grand Junction, CO 81505 <br />Chronic Toxicity Test <br />OXBOW - July 2013 <br />2 Species <br />TABLE 2. Initial Chemistry Ranges for Pimephales promelas and Ceriodaphnia <br />dubia 7 -Day Toxicity Tests Conducted with Elk Creek Mine <br />Effluent - Test Dates July 23 -30, 2013 <br />Effluent Conc. <br />(%) <br />pH <br />D. O. <br />(mg /L) <br />Temperature <br />(C) <br />Conducbvity <br />(umhos/cm) <br />Alkalinity <br />(mg/L) <br />Hardness <br />(mg/L CaCO3) <br />MHW <br />738 -8.01 <br />9.3 -9.4 <br />25.1 -25.4 <br />197 -224 <br />81.2 - 83.6 <br />88.3 <br />6.50% <br />798-8.04 <br />9.2-93 <br />25.1 -25.4 <br />780 -823 <br />NM <br />NM <br />13.00% <br />8.03 -8.11 <br />9.2 -9.3 <br />25.1 -25.4 <br />1160 -1240 <br />NM <br />NM <br />25.00% <br />7.96-8.03 <br />9.2 <br />25.1 -25.4 <br />1960 -2050 <br />NM <br />NM <br />50.00% <br />785-7.96 <br />9.1 -9.3 <br />25.1 -25.4 <br />2330 -2450 <br />NM <br />NM <br />100.00% <br />7.81 -7.95 <br />9.1 -9.2 <br />251 -25.4 <br />4210 -4680 <br />1773 -1922 <br />115.83 - 123.44 <br />NM = Not Measured <br />