2009-03-06_PERMIT FILE - C1981012A (6)

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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale - Page 7, Permit No. CO-0000906 Table VI-1 - E cent Limitations at Out alls 001A and 009A - Tier 1: 2500 m (3.6 m d Rationale ? Parameter 30DayA4. 7 DayAg DalyMax Design Capacity Flow, MGD 3.6 a/ NA Report b/ ELGs TSS, mg/1 35 NA NA NA 70 6.5 c/, 9.0 d/ Water Quality Standards pH, su NA NA 10 Water Quality Standards Oil & Grease, mg11 3500 NA 7000 ELGs Iron, Total, ug/1 Total Ammonia (as N), mg11 Report b/ NA Report b/ Water Quality Standards Electrical Conductivity, dS/m 1.845 NA Report b/ Narrative Standards Report b/ NA Report b/ Narrative Standards SAR Re ort b/ P NA Report b/ Narrative Standards Calcium, mg11 Report b/ NA Report b/ Narrative Standards Magnesium, mg11 181 NA Report b/ Narrative Standards Sodium, mg11 mg11 Bicarbonate Report b/ NA Report b/ Narrative Standards , WET, Acute Lethality (009A) NA NA LC50 > 100% State Permit Regulations Stat. Did & State Permit Regulations WET, Chronic Lethality (00/A) NA NA IC25 > IWC SAR means sodium absorption ratio WET means whole effluent toxicity " This is the design capacity h' In lieu of a limit, reporting is required These limits are instantaneous minimum limits 16 `" These limits are instantaneous maximum limits Table V1-2 Effluent Limitations at Outfalls 001B and 009B - Tier 2: 900 gpm (1.3 mgd) Parameter 30-Day Avg: ,7 Dqy Avg: Daily Max Rationale Flow, MGD 1.3 a/ NA Report b/ Design Capacity TSS, mg11 35 NA 70 ELGs NA NA 6.5 c/, 9.0 d/ Water Quality Standards pH, su Oil & Grease, mg11 NA NA 10 Water Quality Standards Iron, Total, lug/1 3500 NA 7000 ELGs Total Ammonia (as N), mg/l Report b/ NA Report b/ Water Quality Standards Electrical Conductivity, dS/m 3.006 NA Report b/ Narrative Standards SAR Report b/ NA Report b/ Narrative Standards Calcium, mg11 Report b/ NA Report b/ Narrative Standards Magnesium, mg11 Report b/ NA Report b/ Narrative Standards Sodium, mg11 304 NA Report b/ Narrative Standards Bicarbonate, mg/l Report b/ NA Report b/ Narrative Standards WET, Acute Lethality (009B) NA NA LC50 > 100% State Permit Regulations WET, Chronic Lethality (00/B) NA NA Stat. Di , & IC25 > IWC State Permit Regulations SAR means sodium absorption ratio WET means whole effluent toxicity " This is the design capacity • ni In lieu of a limit, reporting is required These limits are instantaneous minimum limits `u These limits are instantaneous maximum limits