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PARrl <br />Page 9 <br />Permit No. COG-600000 <br />B. TERMS AND CONDITIONS <br />• 2. Effluent Limitations <br />c. (coat.) <br />The TRC limitations have bees based on the following assumption. In order for the <br />discharge to be "considered not to result in significant degradation', the arnoun[ of <br />assimilative capacity allocated to the discharge must be limited through section 3.1.8.(3) <br />(c) (iii) of The Basic Standards (Ref. A). This section specifies thaz the increased loading <br />consumed, after mixing with the receiving stream, mtut be less than 15 % of the available <br />inclement between the low-flow pollutant contxnttations and the relevant standards. <br />Assuming the low-flow pollutazu oonaentrations are curreatiy equal [o the previous stream <br />standard of 0.003 mg/1, as allowed in the general permit, 15 R, of dte increment between <br />0.003 mg/P and the new standard of 0.019 mgll is equal to 0.15 ' (0.019-0.003) _ <br />0.0024. Therefore, the new acute permit limitation will be calctlated using the mass <br />balance equation and a maximum allowable ins[ream conoenaation of 0.003+0.0024 = <br />0.0054 mg/1, For rLronic conditions, the corresponding maximum allowable instream <br />concentration is 0.0042 mg/1, using the same method of calcdation as the acute. <br />See rationale Pazt V.B.1. ('I'RC), Part V.D.3. (Bromine), or Pats V.B.2. (F.Coli.). <br />The TRC effluent limitation, Mr, and the +++A*++++~ effluent flow Qr, are enforceable <br />limitations of this pcrmit and are identified in the rationale for each certificazioa. The <br />TRC effluent limitations are 30-0ay averages and/or daily maximum effluent limitations, <br />and the effluent flow shall be a 30-0ay average limitation, where M= is determined to be <br />• greazet than 0.5 mg/P or the receiving waer is unclassified, the TAC effluent limitation <br />shall be 0.5 mg/1. <br />This limitation does not apply to discharges to irrigation ditches. If the discharge enters <br />an irrigation ditch, then no limit will apply, however, monitoring is still requited. <br />(2) 'Ihe effluent limitation for Bromine is calwlated using the same formula as TRC. The <br />water quality standard for Bromine shall be 0.1 mg/1. For an explanation of bow the <br />Bromine limit was established, see V.D.3. of the permit rationale. As with TRC, the <br />effluent limitation, M= and the maximum effluent flow, Q= ate enforceable limitations of <br />this permit and are identified in the rationale for earb certification. <br />(3) The effluent limitation for Fecal Coliform Bacteria is calculated ruing the same formula <br />as 7TtC and Bromine. The water quality standard for Fecal Coliform shall be 200 or <br />2,000 per 100 ml depending on the stream classificazion. See the facility certification m <br />determine the staadazd used in the calculation. <br />(4) TRC monitoring is applicable only whey water source is chlorinated (such as municipal <br />water) or a halogenated disinfectant wmpouad is used. <br /> <br />