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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 3. Final Chemistry Ranges for Pimphales promelas and C eriodaphnia <br />dubia 7 -Day Toxicity Tests Conducted with Elk Creek Mine <br />Effluent - Test Dates July 23 -30, 2013 <br />F Effluent Conc. <br />( %) <br />Test Organism <br />pH <br />Dissolved Oxygen <br />(mg/L) <br />Temperature <br />C ) <br />MHW Control <br />C. dubia <br />7.98 -8.21 <br />93-9.4 <br />25.1 -25.4 <br />P. promelas <br />7.98 -8.33 <br />9.3 -9.4 <br />25.1 -25.4 <br />6.5 <br />C. dubia <br />8.04 -8.22 <br />9.3 -9.4 <br />25.1 -25.4 <br />P. promelas <br />811 -8.33 <br />93-9.4 <br />25.1 -25.4 <br />13 <br />C. dubia <br />8.03 -8.23 <br />9.3 -9.4 <br />25.1 -25.4 <br />P promelas <br />7.96 -8.18 <br />9.2 -9.4 <br />25.1 -25.4 <br />25 <br />C. dubia <br />8.22 -8.54 <br />9.2 -9.4 <br />25.1 -25.4 <br />P. romelas <br />7.91 -8.03 <br />9.1 -9.3 <br />25.1 -25.4 <br />50 <br />C. dubia <br />826-8.66 <br />9.0 -9.3 <br />25.1 -25.4 <br />P. promelas <br />7.80 -8.00 <br />9.3 -9.4 <br />25.1 -25.4 <br />100 <br />C. dubia <br />8.35 -8.67 <br />9.2 -9.3 <br />25.1 -25.4 <br />P. promelas <br />7 80 -8 03 <br />9.2 -9.4 <br />25.1-254 <br />FHM = Fathead Minnow <br />