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COLORADO DEPARTMENT OF PUBLI•'EALTH AND THE ENVIRONMENT, Wat~uality Control Division ~ <br />Rationale -Page 7, Permit No. CO-00041467 <br />Chronic WET Results - Ceriodaphnia dubia <br />Month/Yr Effect Dilution .::: <br /> Perf.:..: <br />Control:.. Dil.:.:.: <br /> <br />Ctinrrol . :6.25..%:. <br /> <br />. :'.12.5. % : :. 25. % 50 % .. ::100 %..:. <br /> <br />10/93 Survival(%) 100 100 100 100 100 100 90 <br /> Mean 3 <br />Brood 20.7 21.5 21.4 19.1 18.0 7.9 0.0 <br /> <br />03/94 Survival(%) 90 100 80 90 100 100 100 <br /> Mean 3 <br />Brood 20.3 21.0 14.8 19.2 20.5 21.1 0.9 <br /> <br /> <br />Chronic WET Results - Pimephales promelas <br />Month/Yr Effect ; : ': Dilution: :: ;'':.....:::.:';: <br /> Perj.. .. <br />Control :. Dil... <br />Conlrol 6-25. %:: 12:5 %: ; 25;% :::50.%.: :.700.%:.: <br /> <br />10/93 Survival (%) 100 97.5 97.5 95 97.4 97.5 52.5 <br /> Dry Weight 0.37 0.33 0.49 0.40 0.47 0.40 0.35 <br /> <br />03/94 Survival (%) 100 100 95 97.5 97.5 92.5 95 <br /> Dry Weight 0.66 0.52 0.6! 0.53 0.58 0.53 0.44 <br /> <br />The above data show a toxic response to the e,JJluent far bath species. /t should also be <br />noted that at the time that this amendment was being drafted, the Division received <br />notification that the effluent had jailed the 2nd quarter, 1995, acute WET test for <br />ceriodaphina. <br />