- 14 - 



TDS = (0.638 X specific conductance) + 12.396 

 (r2=0,87, n=322) 



No excursions of the short-tetm TDS objective have been observed to 

 date using either dataset. 



Short-Term ODjsctlve (1300 nig/U 



ts7a lOTa 1077 lara 



laao laat 



from aampla analyses 



+ from ragraaalon 



Figure 5. TDS Three-Month Moving Flow-Weighted Concentration 

 East Poplar River at International Boundary 



Five-year flow-weighted TDS concentrations (Figure 6) remained well 



below the proposed long-term objective of 1 000 mg/L. April 1982 



3 

 was a period of extremely high discharge (approaching 90 m /s) 



and low TDS (350 rag/L) . As a result of this high discharge period, 



the flow-weighted TDS concentration was decreased approximately 



150 mg/L for five years after the event. 



Long-Term Objective (1000 mg/U 



ia7a t*77 iwn iwn 



Figure 6 . TDS Five-Year Moving Flow-Weighted Concentration 

 East Poplar River at International Boundary 



