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Minrec, Incorporated Water Quality Assessment <br />APPENDIX A <br />Water Quality Assessment <br />North Thompson Creek <br />Minrec North Thompson Creek Mines <br />Table of Contents <br />CO- 0048233 <br />I. WATER QUALITY ASSESSMENT SUMMARY ............................................................................................. ..............................2 <br />II. INTRODUCTION ................................................................................................................................. ............................... <br />2 <br />III. WATER QUALITY STANDARDS .............................................................................................................. ..............................4 <br />NarrativeStandards ................................................................................................................................ ..............................4 <br />Standards for Organic Parameters and Radionuclides ........................................................................ ..............................4 <br />Salinityand Phosphorus ......................................................................................................................... ..............................5 <br />Temperature........................................................................................................................................... ............................... <br />6 <br />Segment Specific Numeric Standard ..................................................................................................... ............................... <br />6 <br />*Sculpin equation only applies when the receiving stream hardness is less than 113 mg11 ............... ............................... <br />7 <br />Table b clue Standards and Hardness Calculations ............................................................................ ............................... <br />7 <br />Regulation 93 303(d) List and Total Maximum Daily Loads ............................................................ ..............................9 <br />Regulation 94 — 305(6) Monitoring and Evaluation List ...................................................................... ..............................9 <br />IV. RECEIVING STREAM INFORMATION ...................................................................................................... ..............................9 <br />LowFlow Analysis ................................................................................................................................. ............................... <br />9 <br />MixingZones .......................................................................................................................................... .............................10 <br />AmbientWater Quality ........................................................................................................................... .............................10 <br />*THIS DATA POINT NOT PROVIDED IN THE PREVIOUS WATER QUALITY ASSESSMENT ............................... ..............................1 <br />1 <br />V. FACILITY INFORMATION AND POLLUTANTS EVALUATED ................................................................ ..............................1 <br />1 <br />FacilityInformation ............................................................................................................................... .............................11 <br />Pollutantsof Concern ............................................................................................................................ .............................12 <br />VI. DETERMINATION OF WATER QUALITY BASED EFFLUENT LIMITATIONS ( WQBELS) ........................ .............................12 <br />TechnicalInformation ........................................................................................................................... .............................12 <br />Calculationof WOBELs ......................................................................................................................... .............................13 <br />Agricultural Use Parameters (SAR, Na and EC) :................................................................................ .............................14 <br />VII. ANTIDEGRADATION EVALUATION ...................................................................................................... .............................15 <br />Introduction to the Antidegradation Process ........................................................................................ .............................16 <br />Significance Tests for Temporary Impacts and Dilution ..................................................................... .............................16 <br />New or Increased Impact and Non Impact Limitations (NILs) ............................................................ .............................16 <br />Calculation of Non - Impact Limitations ................................................................................................ .............................18 <br />Determination of Baseline Water Quality ( BWQ) ................................................................................. .............................19 <br />Bioaccumulative Significance Test ........................................................................................................ .............................20 <br />Significant Concentration Threshold .................................................................................................... .............................21 <br />Determination of the Antidegradation Based Average Concentrations .............................................. .............................21 <br />Concentration Significance Tests .......................................................................................................... .............................22 <br />Antidegradation Based Effluent Limitations O DBELs) ....................................................................... .............................23 <br />AlternativesAnalysis .............................................................................................................................. .............................24 <br />VIII. REFERENCES ....................................................................................................................................... .............................24 <br />Appendix A (WQA V 7.0) Page 1 of 25 Last Revised Sept 14, 2009 /ES <br />