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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />~mendmem No. 2 -Rationale -Page 3, Permit No. CO-0000221 <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Determination ojEjfluent limitations <br />1. Effluent Limitationt: The jollowing limitations will apply and are discussed in Section V/.A.1. <br />Table V!-! - Effluent limitations for OutjalLr OIO and Oll <br />,.. <br /> <br /> <br />Parameter <br /><.Drsc arge limitations.. . <br />Marirtitm Crinrenlmtiohs :. <br />30QIbv Avp; Daily Mar.. <br /> <br /> <br />ationale <br />Flow, MGD Report Report Design Capacity <br />7SS, mg/P 35 70 Federal E-Qluent Guidelines <br />Total Iron, mg/l 3.0 6.0 Federal Effluent Guidelincs <br />Settleable Solids, mP/P N/A 0.5 Federal Effluent Guidelincs <br />Oil and Grease, mg/P N/A 10 State EJJluenl Regulations <br />pH, s. u. (minimum-maximum) N/A 6.5-9.0 Water Quality Standards <br />WET. Acute N/A LC,,,> 100% State Permit Regulations <br />Total Suspended Solids, Total Iron and Settleable Solids limitations are subject to burden of proof requirements -see <br />section VI.A.1.6). <br />2. Disarssion of Effluent Limitations <br />• a) Regulations (or Effluem Limitations: The Regulations jot Effluent Limitations (10. /.0), apply to the conventional <br />pollufams. For outfalls 010 and 011, the limitation for Oil and Grease is based on this reguarion. <br />b) Aoolicable Federal Effluent Guidelines and Standards: The federal guidelines which apply to this type ojjaciliry <br />are found under 40 CFR 434, tilled Coal Mining Point Source Effiuerst Guidelines. The limitations which apply are <br />shown in the jollowing table. <br />Tab[c V/-1 - Fcdcrnl Standards (40 CFR 434) <br />Parairsuer :..: :. :.:..: .... limuatioris: <br />,. <br />30.DaY AvA.Coeeenlration ... Daily Max. Concentration <br />pH, s.u. (minimum -maximum) ---6.0 - 9.0-- <br />Total Suspended Solids, mg/N 35 70 <br />Total Iron, mg/P• (NSPS~~) 3.0 6.0 <br />Settleable Solids. mP/l• N/A 0.5 <br />• There parameters rubjra to Bwtm of Proof Requirrmrntr, rte Herr recnon <br />•• New Sourer Perfomtana Standards <br />Alternate Limitation Burdm o(Proo(Reauiremems: !n conformance with 40 CFR 434.63, the permittee has the <br />burden of proof when requesting relief from total suspended solids (TSS), total iron and/or settleable solids <br />limitations, as appropriate. The iuent of this regulation is to afj'ord relief only when needed due to a volume of <br />water generated by a sperific storm evem, it is not imended to be automatically applied to all discharges caused by <br />precipitation, nor to be used to discharge volumes in excess ojthat generated by the storm event. On this basis, <br />• relief shall be granted only when necessary and shall not be granted when the permitree has control over the <br />discharge, enabling them to coca the primary limitations. The pemdttee should endeavor ro meet the primary <br />limitations whenever possible. Because manual dewmering can be accomplished as time and conditions permit, alI <br />manual dewatuing steal! be required to meet the primary limitations. The Division shall determine the adequacy <br />of proof. As parr of this duermination, the Division shall evaluate whether the pernuttee cau/d have controlled the <br />discharge in such a rwrmer that primary limitations could have been met. <br />