TABLE OF CONTENTS (Continued) 



Page 



Table 1 - 1987 Operating Statistics for Generating Units 



No . 1 and No . 2 * 



2 - Simultaneous Streamflow Measurement Results 8 



3 - Cookson Reservoir Storage Statistics for 1987 9 



4 - Recommended Water Quality Objectives and Excursions, 



1987 Sampling Program, East Poplar River at the 

 International Boundary 18 



5 - 1987 Monthly Pvimpages from Mine Dewatering 



Activities 21 



6 - Chemical Data from GWQQC Observation Wells 31, 32, 33 



7 - SPC-PRPSS Ash System, 1987 Calculated Seepage Rates . . 34 



8 - Sulphur Dioxide in Ambient Air, Montana 42 



9 - Sulfation Rate - Milligrams Sulphur Trioxide per 



100 Square Centimetres per day 43 



Figure 1 - Poplar River Mine — Location Map 6 



2 - Discharge during 1987 Compared with Median 



Discharge for 1951-80 for the Poplar River at 

 International Boundary 7 



3 - Hydrograph of Water Discharge of the East Poplar 



River at the International Boundary and 



Recommended Minimum Flow 10 



4 - 1987 TDS Grab Sample Data, East Poplar River at 



International Boundary 13 



5 - TDS Three-Month Moving Flow-Weighted Concentration 



East Poplar River at International Boundary 14 



6 - TDS Five-Year Moving Flow-Weighted Concentration 



East Poplar River at International Boundary 14 



- Ill - 



