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COLORADO DEPARTh1EA'T OF PU....1C HEALTH AND ENVIRONMENT. 1Varer (~ua(ity Canrrol Divisiat <br />Rationale -Page 4, Perrnir No. CO-0036654 <br />V/. TERh1S AND COND/T/OA`S OF PE211/T <br />A. Derennination of EJJlueut Limitanars <br />1. E1Rrtent Limirarions.~ The follo,ving li»rirations will apply and are discrssed in Sections V/.A.2 and VI.A.3. <br />Table V/-I -- Efflue»t Limitations <br /> Discharge Limitations <br /> ,1laximurn Concentrations <br />Parameter 30-Day AvR. Daily hfax. Rationale <br />Flow, MGD 0.46 Report Design Capacity <br />TSS, mg/P* 35 70 Federal Effluent Guidelines <br />TR /tort, rrtg/P 1.0 Report Water Quality Standards <br />Settleable Solids, »rP/P* Report 0.5 Federal Effluent Guidelines <br />Oil and Grease, ntg/P N/A 10 State Effluent Regulations <br />pH, s. u. (Minimu»r-Marirnurn) N/A 6.5-9.0 Water Quality Standards <br />Cortductivin•, µmha/cnr Report Report Salinity Regulations <br />WET, Chronic Lerhalin~ N/A Statistical State Pernrit Regulations <br /> Difference <br />* These pararnerers are subject to Barden of Proof Regt<irerrtenrs, see section Vl.A.3.6). <br />1. Calculation o! Water Ottalin~ Based Effluent Limitations: Amass ba[mtce equation ,vas used to determine the <br />efjluenr concentrations that would nor violae dre allowable in-stream concentrations defined by the water qualir; <br />standards (except in rlte case of pH, „here the limitations are set directly jrom stream standards or effluent <br />regulariau without using a mass balance approach). The mass balance equation is: <br />ry = MrQt - h1rQr <br />Qt <br />Where.• <br />Qr = Upstream /o,vJlaw (1 E3 or 30E3) jrom Part l/l.8.2 <br />Qi =Average daih~ effluent flo„ (design capacity) <br />Qj = Combined downstream flow (Qr + Qt) <br />Mr = Upstream bacAground pollutant roncenrration Jran //l. B. l <br />Mt = Unknown; Maximum allo„a61e effluent pollutant concerurarion calculated using nmss balance equation <br />MJ = Maxirmun downstream allowable po(ltrrmu concenrrarion (stream srmrdard) <br />Because of the nwrherrtarical relatiortslrip ben,~eert Jlo,v, pollutant concertrratiars and pollutant mass, concentration <br />lirnirations calculated using this nrer/rud implicitly lirnir irtstreanr pollutant mass to the maximum allowable level. <br />Also, only flo,v and concentration li»ritartorts need to be specifted in the permit. Mass limitarlons are not required. <br />A summary of the mass balance calculations (if any) is shown and discussed in VLA.3. <br />3. Discussiar o(Efllueru Lirnimtions <br />a) Reeulations for Effuent Lnnirntions: 77re Regulations jot Effluent Limitations (10. /.0), apply ro the <br />conventional pollutants. For this jacilin~ the limitation jot Oil and Grease is based on this regulation. <br />CJ <br />