2020-12-22_REVISION - M1977300 (6)

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COLORADO LEGACY LAND SCHWARTZWALDER MINE MS TABLE E- WO ORAI)0 DISCHARGE ERMIT K - 001244 ATER TREATMENT PLANT DISCHARGE AMPUNc. V0'0 MPNTS Effluent Limitations Maximum Concentrations Monitoring Requirements 30-Day 7-Day Daily Maximum 2-Year Frequency Sample Type Effluent Parameter Units Average Average Average Antimony,Total µg/L 5.6 - 2 Days/Month Composite Arsenic,Total Recoverable µg/L Report - 2 Days/Month Composite Boron,Total Recoverable mg/L 0.75 - 1 2 Days/Month Composite Cadmium,Potentially Dissolved µg/L Report Report - 2 Days/Month Composite Chemical Oxygen Demand mg/L 100 200 - 1 Day/Week Composite Chromium(Cr[III]),Total µg/L - 50 0.75 2 Days/Month Composite Hexavalent Chromium(Cr[IV]),Dissolved µg/L Report Report - 2 Days/Month Composite Copper,Potentially Dissolved µg/L 12 18 1.8 2 Days/Month Composite Cyanide,WAD µg/L - - 5 0.85 2 Days/Month Composite Chloride mg/L 250 - - 54 2 Days/Month Composite Effluent Flow MGD 0.288 - Report - Continuous Recorder Fluoride mg/L - - 2 - 2 Days/Month Composite Iron,Dissolved µg/L 300 - - 45 2 Days/Month Composite Iron,Total Recoverable µg/L Report - Report 2 Days/Month Composite Manganese,Dissolved µg/L 50 - 7.5 2 Days/Month Composite Mercury,Total µg/L Report - - - 2 Days/Month Composite Nickel,Potentially Dissolved µ /L Report - Report Report 2 Days/Month Composite Oil and Grease mg/L - - 10 5 Days/Week Visual/Grab pH - - 6.5-9 - 5 Days/Week Grab Selenium,Potentially Dissolved µg/L Report - Report Report 2 Days/Month Composite Silver,Potentially Dissolved µg/L 0.13 - 3.5 0.02 2 Days/Month Composite Sulfate mg/L 250 - - 131 2 Days/Month Composite Sulfide m /L Report - - Report 2 Days/Month Composite Total Radium 226+228 pCi/L 5 - - - 2 Days/Month Composite Radium 226,Dissolved pCi/L 3 - 10 - 2 Days/Month Composite Radium-226,Total pCi/L 10 - 30 - 2 Days/Month Composite Total Dissolved Solids mg/L Report - Report - Quarterly Composite DECEMBER 2020 37 AMENDMENT 5