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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 4. Mean Number of Young per Female and Percentage Survival for <br />Ceriodaphnia dubia After 7 -Day Exposure to Elk Creek Mine <br />Effluent - Test Dates July 23 -30, 2013 <br />Effluent Concentration <br />N <br />Mean Number of Young <br />per Female +/- S.D. <br />Percentage Survival <br />MHW Control <br />28.3 + / -2.1 <br />100 <br />6.5 <br />22.7+/-25 <br />100 <br />13.0 <br />26.3+/-32 <br />100 <br />25.0 <br />22.8 + /-4.6 <br />100 <br />50.0 <br />25.9 + / -1.7 <br />100 <br />100.0 <br />0 <br />0 <br />