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General Minimal Discharge Pmnit Rationale <br />Permit No. COG-600000 <br />Page 15 <br />V. TERMS AND CONDITIONS OF PERMIT <br />D. Limits Determined by Best Professional Judgement <br />3. Bromine : (cont.) <br />Based upon some previous toxicity data, the recommendation made by EPA in the 1972 "Blue <br />Book" (see Reference DJ for bromine was: "Jt is recommended that free (molecular) bromine <br />in the marine environnum not exceed 0.1 mg/L and that ionic bromine in the form of bronutte <br />be maintained below 100 mg/l. " Thus, based upon the available toxicity information and the <br />previous recommendation for bromine, the Division has determined by Best Professional <br />Judgement (BPJJ that an instream level of 0.1 mg/1 for bromine is applicable. <br />E. Discussion of Limitations: <br />Flow: <br />A flow limit rs included in the permit, due to the various limiu being flow-based for some <br />facilities. The flow limit used will be the 30 day average flow from the facility. See the <br />individual Certifuation Rationale for the flow limit applicable ro the individual facility. <br />2. Salini <br />Salinity, or rota[ dissolved solids (1DSJ is an issue in the Colorado River Basin. Regulation <br />3.10.0, "Regulations for Implementation of the Colorado River Salinity Standards Through <br />the Colorado Discharge Permit Program, " (See Ref.EJ addresses the discharge of 7DS to the <br />Colorado River Basin. The regulation requires that the salinity of each discharge to the <br />Colorado River Basin be evaluated for impact on the system Since discharges from facilities <br />are not judged to have a water quality impact, and these discharges are imerminent and <br />infrequent, it has been determined that no significant impacu due to 7DS should occur on <br />the Colorado River. No salinity or 7DS monitoring will be included, however, the Division <br />reserves the right to require monitoring for 7DS. The State reserves the right to refuse the <br />applicability under the general permit of any discharge if it appears that the discharge will <br />not be consistent with the regulation. <br />