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

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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale - Page 8, Permit No. CO-0000906 • Table V1-3 - Effluent Limitations at Parameter 7- Max Flow, MGD 0.29 a/ NA Report b/ TSS, mg11 35 NA 70 pH, su NA NA 6.5 c% 9.0 d/ Oil & Grease, mg11 NA NA 10 Iron, Total, ug/1 3500 NA 7000 Total Ammonia (as N), mg11 Report b/ NA Report b/ Electrical Conductivity, dS/m 9.227 NA Report b/ SAR Report b/ NA Report b/ Calcium, mg11 Report b/ NA Report b/ Magnesium, mg11 Report b/ NA Report b/ Sodium, mg/l 963 NA Report b/ Bicarbonate, mg1l Report b/ NA Report b/ WET, Acute Lethality (009C) NA NA LC50 > 100% Stat. D? & WET, Chronic Lethality (001 C) NA NA IC25 > IWC SAR means sodium absorption ratio WET means whole effluent toxicity a/ This is the design capacity ni In lieu of a limit, reporting is required `/ These limits are instantaneous minimum limits • `1/ These limits are instantaneous maximum limits Rationale : Design Capacity ELGs Water Quality Standards Water Quality Standards ELGs Water Quality Standards Narrative Standards Narrative Standards Narrative Standards Narrative Standards Narrative Standards Narrative Standards State Permit Regulations State Permit Regulations Table V1-4 Effluent Limitations at Outfalls 004A, 007A and 008A Parameter 30 Day Avg. 7 Day. Avg. Daily Max Rationale;; Flow, MGD Report a/ NA Report b/ Design Capacity TSS, mg11 35 NA 70 ELGs pH, s.u. NA NA 6.5 e% 9.0 d/ Water Quality Standards Oil and Grease, mg11 NA NA 10 State Effluent Regulations Iron, Total, µg/1 3500 NA 7000 ELGs Settleable Solids, ml/l Report b/ NA 0.5 ELGs " Because these outfalls consist entirely of surface runoff, a design flow capacity has not been assigned and report, only, is specified. hi In lieu of a limit, reporting is required These limits are instantaneous maximum limits These limits are instantaneous minimum limits 001 C and 009C - Tier 3: 200