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COLORADO DEPARTMEM OF PUBLIC HEALTH AND ENVLRONMENT, Water Quality Control Division <br />Rationale -Page 7, Permit No. CO-0017146 <br />pH, s.u. (minimum-maximum) N/A 6.5-9.0 Water Quality Standards <br />Total Dissolved Solids, mg/¢ Report Report CO River Salinity Regs <br />WEZ, Acute N/A LC,o> 100% State Permit Regulations <br />Tahl VI-2 - Fffirt rtt .imitatinnc far O ~Knnc OOS nab nm nnR Mlo ntn mt nt?and me <br />Disch a Limitations..:.: <br />~% ' <br />Maxtmum Concentrakaks :.:.. , <br />.... . <br />Parameter.. 30-Day Avg. ' Daily Max.:..:.: Rationale ' :: ... <br />Flow, MGD <br />TSS, mg/¢* <br />Totallron, mg/¢* <br />Settleable Solids, m¢/¢* <br />Oll and Grease, mg/¢ <br />pH, s.u. (minimum-maximum) <br />Report Report Design Capacity <br />35 70 Federal EjJluent Guidelines <br />3.5 7.0 Federal Effhtent Guidelines <br />Report 0.5 Federa! Effluent Guidelines <br />Report 10 State EfJluem Regulations <br />N/A 6.5-9.0 Water Quafity Standards <br />Total Dissolved Solids, mg/¢ Report Report CO River Salinity Regs <br />* Total Suspended Solids and Totallron limitations are Primary Limitations, and Settleable Solids limitations are <br />Alternate Ltmitationt. Exemmpption om these limitations due to storm events is subject to burden of proof <br />requirements -see section V1.A.3. ). <br />Drseharge Ilmrtattates ..: :.... <br />MaxtmumConcendntions ;.:: : .'; ;::':.: <br />- ... .... <br />Parameter ::: '::: ::.:30-Day Avg. . ' DatTq Mar::::...':'..:.-.:.:: Rationale ".:::.:..:: . <br />Flow, MGD Report Report Design Capacity <br />Settleable Solids, m¢/¢* Report 0.5 Federal Ejjluem Guidelines <br />Oil and Crease, mg/¢ Report 10 State E~Iuent Regulations <br />pH, s.u. (minimum-maximum) N/A 6.5-9.0 Water Quality Standards <br />Total Dissolved Solids, mg/¢ Report Report CO River Salinity Regs <br />* The settleable solids limitation is the Primary Limitation. Exemption from this limitation due to storm events is <br />subject to burden of proof requiremens -see section VI.A.3.6). <br />2. Tota! Maximum Dai(v Load tTMDLI Ana~s !Water Quality Based EflLem Limitanonsl: In order to calculate water <br />quality standard based limitations for outfalls 001, 001, 004 and DIS, a Total Maximum Daily Load (1'~L) analysis <br />was performed for rota! recoverable iron. /n most situations, a mass balance equation is used to determine the <br />ejjluent concentrations that would not violate the allowable instream concentraaons deftned by the water quality <br />standards (except in the case of pH, where the limitations are set directly from stream standards or eJJ'luent <br />regulations without using a mass balance approach). The mats balance equation is: <br />Mt . M3Qt - MiQi <br />Qr <br />