Figure 3. Annual fuel consumption for fuel oil and coal at the 



Poplar River Power Station 8 



Figure 4. Map showing past, present, and future coal mines used 



to supply the Poplar River Power Station 11 



Figure 5. March through October runoff for 1981-90 as compared to 

 the 1931-80 mean and median runoff on the Poplar River 

 at International Boundary 12 



Figure 6. Monthend contents and elevations for Cookson Reservoir . .13 



Figure 7 . Recorded discharge of the East Poplar River at Interna- 

 tional Boundary as compared to the total minimum flow 

 recommendation 15 



Figure 8 . TDS grab sample data for East Poplar River at Interna- 

 tional Boundary for period 1981-90 19 



Figure 9. Box plot of annual TDS concentrations for East Poplar 



River at International Boundary for period 1981-90 . . . .19 



Figure 10 . Mean daily discharge for water quality sampling dates 



for East Poplar River at International Boundary 20 



Figure 11. Box plots of monthly TDS concentrations for East Poplar 



River at International Boundary for period 1981-90 . . . .20 



Figure 12 . Monthly boxplots of streamf lows for samples collected 

 at East Poplar River at International Boundary for 

 period 1981-90 21 



Figure 13. Distribution of TDS concentrations for East Poplar 



River at International Boundary for period 1981-90 ... .22 



Figure 14. Sen Slope estimate for TDS at East Poplar River at 



International Boundary 22 



Figure 15. Three-month moving, flow-weighted TDS concentration for 



East Poplar River at International Boundary 23 



Figure 16. Five-year moving, flow-weighted TDS concentration for 



East Poplar River at International Boundary 24 



Figure 17. Boron grab sample data for East Poplar River at Inter- 

 national Boundary for period 1981-90 25 



Figure 18. Box plots of annual boron concentrations for East 

 Poplar River at International Boundary for period 

 1981-90 25 



Figure 19. Box plots of monthly boron concentrations for East 

 Poplar River at International Boundary for period 

 1981-90 26 



Figure 20 . Distribution of boron concentrations for East Poplar 



River at International Boundary for period 1981-90 ... .27 



