TABLE OF CONTENTS 



Page 



LETTER OF TRANSMITTAL i 



1985 HIGHLIGHTS v 



INTRODUCTION 1 



POPLAR RIVER POWER STATION AND MINING 4 



Operation 4 



Construction 5 



Mining 6 



SURFACE WATER QUANTITY 9 



Streamflow 9 



Minimum Flows 10 



Reservoir Storage 11 



On-Demand Release 11 



SURFACE WATER QUALITY 12 



East-Poplar River at the International Boundary 12 



Total Dissolved Solids 13 



Boron 15 



Other Water Quality Characteristics 17 



Cookson Reservoir 17 



Data Comparison 19 



GROUND WATER QUANTITY 21 



Coal Mine Dewatering in Saskatchewan 21 



Discharges 21 



Water Levels 22 



Montana 22 



GROUND WATER QUALITY 24 



Saskatchewan 24 



Water Quality in the Tills 24 



Water Quality in the Empress Gravels 26 



Montana 27 



ASH LAGOON QUALITY AND QUANTITY 28 



AIR QUALITY 31 



Saskatchewan 31 



Montana 34 



Table 1 - 1985 Operating Statistics for Generating 



Units No. 1 and No. 2 4 



Table 2 - Cookson Reservoir Storage Statistics for 1985 11 



