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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 5, Permit No. CO-0031115 <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Determination ojEjfluent Limitations <br />1. Eflluentlimitations.• The effluent limitations contained in Tables VI-1 will apply and are discussed in Section VIA.2. <br />Table VI-1-Effluent Limitations for Ourja11011, 017, 019. 020. 021. 023 <br />Flow, MGD Repart/Repon c Design Capacity <br />TSS, mg/! 35/70 c, d Federal Guidelines (BAT) <br />pH, s. u. 6.5-9.0 6 Water Quality Standards <br />Oil and Grease, mg/! IO a State Regulations <br />TDS, mg/l Report/Report c Salinity Regulations <br />WET, Acute LCso> 100% a State Permit Regulations <br />Settleable Solids, mUl NA/0.5 c, d Federal Guidelines <br />Iron, Total, uq/1 3000/6000 c, d Federal Guidelines (NSPS) <br />Table VI-2-EfRuentLimitations <br />Flow, MGD ReportlReport c Design Capacity <br />TSS, mg/l 35/70 c, d Federal Guidelines (BAT) <br />pH, s.u. 6.5-9.0 b Water Quality Standards <br />Oil and Grease, mg/1 ]0 a State Regulations <br />TDS, mg/1 Report/Report c Salinity Regulations <br />Settleable Solids, mUl Repord0.5 c, d Federal Guidelines <br />Iron, Total, uA/1 3000/6000 c, d Federal Guidelines (NSPS) <br />Ol <br />pH, s.u. 6.5-9.0 b Water Quality Standards <br />Oil and Grease, mg/! 10 a State Regulations <br />TDS, mg/1 Report/Report c Salinity Regulations <br />Settleable Solids, ml/1 Report/0.5 c, d Federal Guidelines <br />° Daily Maximum <br />e Minimum-Maximum <br />` 30-day average/daily maximum <br />d See section YI,9.3.c. for applicability <br />2. Discussion of Effluent Limitations <br />a. Oil and Grease: The Regulations for Effluent Limitations (Regulation No. 62) include effluent limitations that apply <br />to all discharges of wastewater to State waters. These regulations are applicable to the ditcharge from the Trapper <br />Mine WWTF The Oil and Grease concentrations from the Regulations for Effluent Limitations are the most <br />stringent effluent limits and are therefore applied. <br />b. ~ -This parameter is limited by Water Quality Standards (WQS) as the WQS of 6.5-9.0 s.u. range are more <br />stringent than those specified ursder the Regulations for Effluent Limitations . Previously, the upper limit was set at <br />9.5 s.u. for outfalls 001, 002, and 005, however it has been shown that these outfalls can meet the WQS so the upper <br />limits far all outfalls will be 9.0 s. u. <br />c. A~olicable Federal Effluent Guidelines and Standards: The federal guidelines which apply to this type offacility <br />are found under 40 CFR 434, titled Coal Mining Point Source Effluent Guidelines. The limitations which apply are: <br />Table VI-3 -- Federal Standards (40 CFR 434) <br />Parameter Limitations <br />Last Revised: 429/2004 <br />