TABLE OF CONTENTS 



Page 



LETTER OF TRANSMITTAL 3 



1986 HIGHLIGHTS 7 



INTRODUCTION 9 



POPLAR RIVER POWER STATION 12 



Operation 12 



Construction ..... 13 



Mining 14 



SURFACE WATER QUANTITY 16 



Streamflow 16 



Reservoir Storage 17 



Apportionment 18 



Minimum Flows 18 



On-Demand Release 20 



SURFACE WATER QUALITY 21 



East Poplar River 21 



Total Dissolved Solids 22 



Boron 22 



Other Water Quality Characteristics 26 



Glrard Creek and Cookson Reservoir 26 



Quality Control 28 



GROUND WATER QUANTITY 33 



Saskatchewan 33 



Coal Mine Dewatering 33 



Water Levels 34 



Poplar River Mine Relocation 34 



Montana 36 



GROUND WATER QUALITY 38 



Saskatchewan 38 



Water Quality in the Tills 38 



Water Quality in the Empress Gravels 41 



Montana 42 



ASH LAGOON QUALITY AND QUANTITY 45 



AIR QUALITY 48 



Saskatchewan 48 



Montana 51 



