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I• <br />Blue Mountain Energy, Inc. W WTP Water Quality Assessment CO-0038024 <br />Energy, Inc. W WTP combined design flow for all five subject outfalls is 170:1 at low flows. Section <br />31.8 (3)(c) of the regulations specifies that the discharge of pollutants should not be considered to <br />result in significant degradation of the reviewable waters if the flow rate is greater than 100:1 <br />dilution at low flow. Thus, condition 31.8(3)(c) of the regulations is met and no further <br />antidegradation evaluation is necessary. <br />VI. References <br />Colorado Total Maximum Daily Load and Wasteload Allocation Guidance, CDPHE, WQCD, <br />November 1991. <br />Classification and Numeric Standards for Lower Colorado River Basin, Regulation No. 3T, CDPHE, <br />WQCC, Effective February 20, 2002. <br />The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, May 14, 2001 <br />• <br />• Appendix A Page 15 of 15 <br />m <br />:_ <br />