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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division Rationale-Page 4, Permit No. CO-0000132 Table VI-3 E/lluent Limitations for OutfaB 018 Parameter Limit Rationale Flow, MGD Report/Report a Design Capacity TSS, mg/1 30/45 a State Effluent Regulations pH, s.u. 6.5-9.0 c Water Quality Standards Oil and Grease, mg/1 10 b State Effluent Regulations TDS mg/! Report/Report d Salinity Regulations Total Residual Chlorine, mg/1 0.011/0.0/9 d Water Quality Standards * These parameters are subject to Alternate Limitation Burden ofProojRegvirements, see section VLA.2.c. ° 30day average (This is a design capacity, not a permit limit)/daily maximum 6 Daily Maximum ` Minimum-Maximum ° 30-day average/daily maximum ` 30day average/]-day average 1. Discussion ofEflluent Limitations a. DiJ and Grease: The Regulations for Effluent Limitations (Regulation No. 62) include effluent limitations that apply to all discharges of wastewater to State waters. These regulations are applicable to the discharges from the Sanborn Creek Mine and Elk Creek Mine WWTF. The pHlimitations specified in the Regulations for Effluent Limitations are not the most stringent and thus are not used as discussed below. b. ~• This parameter is limited by Water Quality Standards as the water quality standards of 6.5-9.Os.u. range are more stringent than those specked under the Regulations for Effluent Limitations . c. ~olicable Federal Effluent Guidelines and Standards: The federal guidelines which apply to this type offacility are found under 40 CFR 434, titled Coal Mining Point Source EfRuent Guidelines. The limitations which apply are: Table VI-4 -Federal Standards (40 CFR 434 Parameter Limitations 30 Day Avg Daily Moat pH, s.u. (minimum -maximum) -6.0 - 9.0-- Total Suspended Solids, mgA* 35 70 Total Iron, mg/1 * BAT** 3.5 7.0 NSPS*** 3.0 6.0 Senleable Solids, ml/1 * N/A 0.5 * These parameters subject to Burden ojProajRequirements, see next section ** Best Availab/e Technology -applies to those ponds already constructed *** New Source Performance Standards -applies to those ponds constructed after 5/4/84 Alternate Limitation Burden of ProofReauiremen[s: In conformance with 40 CFR 434.63, the perminee has the burden of proof when requesting relief from total suspended solids (TSS), total iron and/or Senleable solids limitations, as appropriate. The intent of this regulation rs to afford relief only when needed due to a volume of water generated by a specific storm event, it is not intended to be automatically applied to all discharges caused by precipitation, nor to be used to discharge vo/umes in excess of that generated by the storm event. On this basis, relief shall be granted only when necessary and shall not be granted when the perminee has control over the discharge, enabling them to meet the primary limitations. The perminee should endeavor to meet the primary limitations whenever possible. Because manual dewatering can be accomplished as time and conditions permit, a!1 manual dewatertng shall be required to meet the primary limitations. The Division shall determine the adequacy of proof. As pan of this determination, the Division shall evaluate whether the permittee could have controlled the discharge in such a manner than primary limitations could have been met. For rainfall to waive 7SS and total iron limitations, it is necessary to prove that discharge directly resulted Last devised: 3/19/2004