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<br />VII -20 <br /> <br />G. Toxic Effects of Chlorine <br /> <br />Chlorine compounds which are measured by the chlorine residual <br />test are extremely toxic to aquatic life. The Water Quality Stan- <br />dards as presented in Section VI state that all waters shall be <br /> <br />free from substances attributable to municipal, industrial or <br /> <br /> <br />other discharges or agricultural practices in concentrations which <br /> <br />are toxic or harmful to human, animal, plant or aquatic life. <br /> <br />Trout are the most sensitive to the toxic effects of chlorine. <br /> <br />It has been recommended by the Colorado Department of Health that <br /> <br /> <br />chlorine residuals in streams with warm water should be less than <br /> <br />0.01 mg/l and cold water, less than 0.002 mg/l. <br /> <br />At the present time only four of the sewage treatment plants <br /> <br /> <br />in the Basin chlorinate their effluent. However in order to meet <br /> <br />the current Standards for the Discharge of Wastes nearly all of the <br /> <br /> <br />treatment facilities will require disinfection facilities. The <br /> <br /> <br />Standards for the Discharge of Wastes states that if any wastewater <br /> <br /> <br />is disinfected with chlorine, the residual chlorine, measured at <br /> <br />the outfall of the disinfection basin, shall not be less than 0.1 <br />mgll nor more than 0.5 mgjl. <br /> <br />If the existing sewage treatment facilities which discharge <br />their effluent into trout bearing streams chlorinate to the maxi- <br /> <br />(. ~ <br />,.,' ",. <br /> <br />(""'! .~ " <br />vi... <br />