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<br /> <br />COLORADO DEPARTMENT OF HE',ALTH, Water Quality Control Division <br />Summary of Rationale - Page 11. Permit No. CO-0042439 <br />VII. TERMS AND CONDITIOt1S: <br />C. Discussion of ]affluent Limitations: <br />3. Fecal coliform and TRC: (Continued) <br />The calculated effluent concentration (M2) for fecal coliform <br />shown in T,ible VII-2 is greater than the limits allowed by the <br />State Fecal coliform Policy, therefore the established limits <br />shall apply. The limits for fecal coliform shall be b,000 <br />organisms per 100 ml (30-day geometric mean) and 12,000 <br />organisms per 100 ml (7-day geometric mean). <br />The calculated effluent concentration (M2) for total residual <br />chlorine shown in Table VII-2 is greater than the limit allowed <br />by the State "Regulations for Effluent Limitations", therefore <br />the established limit shall apply. The limit for total residual <br />chlorine shall be 0.5 mg/1 (dailq mazimum). . <br />4. Total Ammonia: Anew method for calculating the allowable <br />effluent concentration for total ammonia to protect the Water <br />Quality Standard fot the receiving stream bas been developed at <br />the University of Colorado. However, a cursory check of the <br />in-stream ammonia data and the dilution provided by ezisting <br />stream flows indicates a calculated effluent concentration <br />(M2) for [.oral ammonia greater than the concentration ezpected <br />in the effluent from a lagoon system. Therefore, the new method <br />was not run and no ammonia limit or monitoring will be included <br />in the permit. <br />