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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 9. Permit No. CO-0032115. VI. TERMS AND CONDITIONS OF PERMIT Table VI-2 -- Effluent Limits - 012, 013, 014 (new) Parameter Limit Flow, MGD Report a/ TSS, mg/1 35/70 b/ Total Iron, mg/1 3.0/6.0 b/ pH, s.u. 6.5-9.0 c/ 031 and Grease, mg/1 10 d/ Total Dissolved Solids, mg/1 Report d/ Settleable Solids, ml/1 0.5 e/ Rationale NA New Source Performance Stds New Source Performance Stds Water Quality Standards State Effluent Regulations Salinity Regulations Eff. Limits for Precip. Events a/ 30 Day Average b/ Average of daily values for 30 consecutive days/Daily maximum c/ Minimum-Maximum d/ Daily Maximum e/ Effective during periods of precipitation less than or equal to the 10-year, 24-hour precipitation even[ for this facility, subject to burden of proof requirements as described in permit. l Table VI-3 - Effluent Limits - 002, 003, 005, 006, 009, 011 Parameter Limit Rationale Flow, MGD Report a/ NA TSS, mg/1 35/70 b/ BPJ of BCT* Total Iron, mg/1 3.5/7.0 b/ Best Available Technology pH, s.u. 6.5-9.0 c/ Water Quality Standards pH, s.u. 6.5-9.5 d! See Discussion, Section V.B Oil and Grease, mg/1 10 e/ State Effluent Regulations Total Dissolved Solids, mg/1 Report e/ Salinity Regulations Settleable Solids, ml/1 0.5 f1 Eff. Limits for Precip. Etirents Whole Effluent Toxicity, Acute Report See Discussion *Best Professional Judgment of Best Conventional Pollutant Control Technology a/ 30 Day Average ~6/ Average of daily values for 30 consecutive days/Daily maximum c/ Minimum-Maximum d/ Minimum-Maximum. This range applicable only to discharge points 002 and 005, during the months of June [hrough September. e/ Daily Maximum \ f/ Effective during periods of precipitation less than or equal to the J 10-year, 24-hour precipitation event for this facility, subject to burden of proof requirements as described in permit. .~_ .. °: ,~~. 34 ;„ t .~:1JS'~ '~