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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Amendment No. I-Rationale. Page 3, Permit No. CO-0000132 . Table VI-I - EJJTuent Limitations jot Outjal( 0I4 Discharge Limftatfans Maximum Concentrations Parameter 30.Day Avg. Daily Mrtz Rationale Flow, MGD Report Report Design Capacity 7SS, mg/P 35 70 Federal NSPS Total Iron, mg/P 3.0 6.0 Federa! NSPS Settleable Solidr, m8'P N/A 0. S Federa! BAT Oil and Grease, mg/P N/A 10 State Effluent Regulations pH, s. u. (Minimum-Maximum) N/A 6.5-9.0 WaterQualiryStandards TDS, mg/I Report Report Salinity Regulations Total Suspended Solids, Tota! Iron and Settleable Solids limitations are subject to burden of proojrequirements - seesection VLA.2.b). 2. Discussion ofE/1lvent Limitations: The basis jot the efjfuent limitations for 7SS. total iron, settleable solids, pH, oi! and grease and WET is unchanged from that shown to the rationale jot the permit renewal issued October 29, / 996. Because discharge is not erpected at lowJlow periods, no water quality based limitations are applicable. a) Regulations for Effluent Limitations: The Regulations jot Effluent Limitations (10.1.0), apply to the corrventional • pollutants. For this facility the limitations for Oil and Grease are based on this regulation. b) Applicable Federal Effluent Guidelines and Standards: The federal guidelines which apply to this type ojjaciliry are found under 40 CFR 434, titled Coal Mining Point Source Effluent Guidelines. The limitations which apply are: Table Vl-2 -Federal Standards (40 CFR 431) Parameter Umifations 30 Day Avg Daffy Maz pH, s. u. (minimum -maximum) -6.0 - 9.0- Total Suspended Solids, mg/P' 35 70 Total Iron, mg/P' NSPS" 3.0 6.0 Settleable Solids, md'P' N/A 0.5 ' ]hest pwamtters subject to Burdtn ojProof Requirements, sn net! section New Sown Perfwmann Stmdwdt - sgrplty to (hate pmufs mubucted alter S/4/81 Alternate Limitation Burden ofProolReguirements: !n conformance with 40 CFR 434.63, the permittee has the burden ojproojwhen requesting reliejfrom (otal suspended solids (TSS), tots! iron and/or settleable solidt limitations, as appropriate. The intent ojthir regulation it to afford reliejonly when needed due to a volume of water generated by a specific storm event, it is no! imended to be automatically applied to aft discharges caused by precipitation, nor ro be used to discharge volumes in excess ojthat generated by the storm event. On this basis, reliejshall be granted only when necessary and steal/nor be granted when the permittee has control over the • discharge, enabling them ro meet the primary limitations. The permittee should endeavor to meet the primary limitations whenever possible. Because manual dewatering can be accomplished as time and conditions permit, all manual dewatering shall be required to meet the primary limitations. The Division shall de[ermine the adequacy of proof As part ojthrs determination, the Divrsion shall evaluate whether the permittee could have controlled the discharge in such a manner that primary limitations could have been met.