- 16 - 



below the proposed long-term objective of 2.5 mg/L boron. As was 

 the case with TDS, the five-year calculations for boron were 

 significantly influenced by samples collected during a high 

 discharge period in April 1982 (boron concentrations were 

 approximately 0.7 mg/L during that time). 



Short-Term Objective (3.S mg/U 



from sample analysea 

 from regression 



Figure 8. Boron Three-Month Moving Flow-Weighted Concentration 

 Bast Poplar River at International Boundary 



Long-Term OtJlectlve (2.3 mg/L) 



H , 1 , 1 , 1 , 1 1 1 , 1 : 1 



laTe laTa 



tmrr iwn ia7« 



taat !■•■ la 



Figure 9 . Boron Five-Year Moving Flow-Weighted Concentration 

 East Poplar River at International Boundary 



