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Enviro -Chem Analytical, Inc. <br />2493 Hwy 6 &50 Unit 7 <br />Grand Junction, CO 81505 <br />Results <br />Effluent Chemistry Results <br />Chronic Toxicity Testing <br />OXBOW — July 2013 <br />2 Species <br />Table 1 contains the arrival chemistry values obtained for each sample. Effluent <br />sample arrival temperatures ranged from 1.4 -1.6C. Total ammonia concentration <br />was below detection ( <1.0 mg /L) for each of the three effluent samples. The total <br />residual chlorine was below detection ( <0.02 mg /L) for all three samples. <br />Tables 2 and 3 contain the routine chemistry results obtained during the toxicity <br />tests. All pH, dissolved oxygen, conductivity, and temperature values were within <br />acceptable ranges. <br />Effluent Toxicity Results for Fathead Minnows <br />Table 4 contains the survival and growth results for the fathead minnow effluent <br />test. Control organism survival (100 %) met the minimum performance <br />requirement. Chronic survival results show that all effluent dilutions supported <br />mean survival of 100 %. The undiluted effluent supported mean survival of 100 %. <br />The MHW control exposure supported acceptable fathead minnow growth of <br />0.249 mg +/- 0.32 mg. The mean dry weight of the fathead minnows exposed to <br />differing concentration of effluent ranged from 0.206 mg to 0.254 mg. The mean <br />dry weight for the undiluted effluent was 0.244 mg +/- 0.28 mg. <br />The NOEC based on survival was >100% effluent. The NOEC based on growth <br />was 100% effluent. <br />