5 

 TABLE OF CONTENTS (Continued) 



Page 



Table 1 - 1986 Operating Statistics for Generating Units No. 1 



and No. 2 12 



2 - Cookson Reservoir Storage Statistics for 1986 17 



3 - Cookson Reservoir Storage Statistics for 1985, 



Corrected 17 



4 - Recommended Water Quality Objectives and Excursions, 



1986 Sampling Program, East Poplar River 



at the International Boundary 27 



5 - Selected Analytical Results of Quality Control 



Split Samples, June 8, 1986 30 



6 - Analytical Results of Water Quality Standards Exchanged . 31 



7 - 1986 Monthly Pumpages from Mine Dewatering 



Activities 33 



8 - SPC-PRPS Ash System, 1986 Calculated Seepage Rates ... A5 



9 - Summary of 1986 Montana Air Quality Monitoring Results . 52 



Figure 1 - Poplar River Mine — Location Map 15 



2 - Discharge during 1986 Compared with Median Discharge 



for 1951-80 for the Poplar River at International 



Boundary 16 



3 - Hydrograph of Water Discharge of the East Poplar River 



at the International Boundary and Recommended 



Minimum Flow 19 



4 - East Poplar River at International Boundary: 



(a) TDS Three-Month Moving Flow-Weighted 



Concentration 23 



(b) TDS Five-Year Moving Flow-Weighted 



Concentration 23 



5 - East Poplar River at International Boundary: 



Instantaneous and Regression-Generated TDS and 



Boron Concentrations 1975-86 24 



