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COLORADO DEPARTMENT OFPUBLIC HEALTHAND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page S, Permit No. CO-0031115 <br />1. Other Permit Requirements: The permittee has been in apparent compliance with al! other terms and conditions of the <br />permit. <br />VI TERMS AND CONDITIONS OF PERMIT <br />A. Determination ojEffluent Limitations <br />1. E~iuent Limitations: The effluent limitations contained in Tables YI-1 will apply and are discussed in Section YI.A.1. <br />YI-1- Efi9uent Limitations for OutfaB 011. 017.019.010.021.023 <br />TSS, mg/1 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 10 a State Regulations <br />TDS, mg/! Report/Report c Salinity Regulations <br />WET, Acute LCso> 100%a State Permit Regulations <br />Settleable Solids, ml/1 NA/0.5 c, d Federal Guidelines <br />Iron, Total, uAR 3000/6000 c, d Federal Guidelines fNSPS) <br />Table VI-2 - Effluent Limitotions jor Outjalls 007, 002, 005, 008, 009, 014, 018, 022, 024 <br />Parameter Limit Rationale <br />Flow MGD Report/Report 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/l ]0 a State Regulations <br />TDS, mg/! Report/Report c Salinity Regulations <br />Settleable Solids, ml/1 Report/0.5 c, d Federal Guidelines <br />Iron, Total, ui;/1 3000/6000 c, d Federal Guidelines fNSPS) <br />Flow, MGD Report/Report c Design Capacity <br />pH, s. u. 6.5-9.0 b Water Quality Standards <br />Oil and Grease, mg/I 10 a State Regulations <br />TDS, mg/l Report/Report c Salinity Regulations <br />Settleable Solids. ml/1 Report/0.5 c, d Federal Guidelines <br />° Daily Mazimum <br />n Minimum-Maximum <br />` 30day average/daily maximum <br />a See section YLA.3.c.jor applicability <br />2. Discussion of Effluent Limitations <br />a. Oil and Grease. The Relations for Effluent Limitations (Regulation No. 61) include effluent limitations that apply <br />to all discharges ojwastewater to State waters. These regularions are applicable to the discharge from the Trapper <br />Mine WWTF. The Oil and Grease concentrations from the Regulations for Effluent Limitatons 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 specked under the Relations for Effuent Limitations . Previously, the upper limit was set at <br />9.5 s. u. for outfa/ls 001, 001, and 005, however it has been shown that these outfalls can meet the WQS so the upper <br />limits for all outfalls will 6e 9.0 s. u. <br />c. Applicable Federal Elfluent 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 />Lair xew;s~: 3nznoo4 <br />