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PART I Page 9 Permit No. COG1i00000 B. TERMS AND CONDIITONS 2. Effluent Limitations c. (cont.) The TRC limitations have been based on the following assumption. In order for the discharge to be 'considered not to result in significant degradation', the amount of assimilazive capacity allocated to the discharge miss[ be limited through section 3.1.8.(3) (c) (iii) of The Basic Standards (Ref. A). This section specifies thaz the increased loading consumed, after mixing with the receiving stream, must be lest than 15'% of the available increment between the low-flow pollutant concentrations and the relevant standards. Assuming the low-flow pollutant concennations are currently equal to the previous stream standard of 0.003 tng/P, as allowed in the general permit, 15 % of the increment betwem 0.003 mg/P and the new standard of 0.019 mg/P is equal m 0.15 ~ (0.019.0.003) _ 0.0024. Therefore, the new acute permit limitation will be calculated using the mass balance equation and a maximum allowable inc,rram Concenhation of 0.003+0.0024 = 0.0054 mg/P. For chronic wnditions, the corresponding maximum allowable instream concentration is 0.0042 mg/P, using the same method of calculation as the acuu. Sec rationale Patt V.B.1. (1TtC), Part V.D.3. (Bromine), or Part V.B.2. (F.Coli.). The TTtC effluent limitation, M„ and the maximum effluent flow Qr, ate enforceable limitations of this permit and ate identified in the rationale for each certification. The TRC effluent limitations are 30~ay averages and/or daily n,a=+m,+,,, effluent limitations, and the efflurnt flow shall be a 30-day average limitation, where M2 is determined to be greater than 0.5 mg/P or the receiving water is unclassified, the TRC effluent limitation shall be 0.5 mg/P. This limitation does not apply to discharges to irrigation ditches. If the discharge rnters an irrigation ditch, then no limit will apply, however, monitoring is still required. (2) The efflurnt limitation for Bromine is calculated using the same formula as TTZC. The wazer quality standard for Bromine shall be 0.1 mg/P. Fot an explanation of how the Bromine limit was established, see V.D.3. of the permit rationale. As with TRC, the effluent limitation, M= and the ,T,a*~,+„~+*, effluent flow, Qx are enforceable limitations of this permit and are identified in the rationale for each certificazion. (3) The effluent limitation for Fecal Colifotm BaMeria is calculated using the same formula as TRC and Bromine. The water quality standard for Fecal Coliform shall be 200 or 2,000 per 100 ml depending on the stream classification. Sce the facility certification to determine the standard used in the calculation. (4) TRC monitoring is applicable only when wazer source is chlorinated (such as municipal water) or a halogenatod disinfectant compound is used.