TABLE OF CONTENTS 



HIGHLIGHTS FOR 1981-90 vi 



INTRODUCTION 1 



POPLAR RIVER POWER STATION 5 



Operations 5 



Construction 10 



Mining 10 



SURFACE WATER QUANTITY 12 



Streamflow 12 



Apportionment 13 



Reservoir Storage 14 



Minimum Flows and On-Demand Releases 14 



Quality Control 16 



1981-90 SURFACE WATER QUALITY 17 



East Poplar River 17 



Total Dissolved Solids 17 



Boron 24 



Mercury in Cookson Fish 29 



Other Water Quality Variables 31 



1990 SURFACE WATER QUALITY 33 



East Poplar River 33 



Total Dissolved Solids 33 



Boron 33 



Other Water Quality Variables 34 



Girard Creek and Cookson Reservoir 36 



1981-1990 36 



1990 38 



Quality Control 41 



GROUND WATER QUANTITY 42 



Saskatchewan 42 



Cookson Reservoir Supplementary Supply 42 



Salinity Dewatering Project 47 



Montana 50 



GROUND WATER QUALITY 52 



Saskatchewan 52 



West Side of Lagoon 52 



Location 8a (West of Cell #1) 52 



Location 9a (West of the Polishing Pond) 55 



North Side of Lagoon 58 



Location 2a (North of the Polishing Pond) 58 



Locations 2b and 2c (North of the Polishing Pond) ... 61 



Locations 24, 25, and 26 (North of Cell 3) 61 



South Side of Lagoon 62 



Locations 22 and 23 (South of Cell #1) 62 



Locations 26, 27, and 28 (South of Cell #3) 64 



Southwest of Morrison Dam 67 



Locations 18 and 21 67 



Montana 69 



