- 13 - 



Five-year FWCs for TDS (Figure 5) remained below the long-term objec- 

 tive of 1,000 mg/L. A 200 mg/L increase in the five-year FWCs occur- 

 red in early 1988. This corresponds to a loss of the influence of 

 high 1983 spring flows. A similar increase was seen during 1987, a 

 remnant of 1982 discharge. Relatively low spring discharges have 

 occurred since 1984; it is expected that the five-year FWCs for the 

 next few years will level off if spring discharges remain low, or 

 decrease if high runoff years occur. 



The relationship between TDS and specific conductance generated from 

 data collected to the end of 1988 was as follows: 



TDS = (0.640 x specific conductance) + 10.875 

 (R 2 = 0.87, n=350) 



Boron 



During 1988, boron concentrations in the East Poplar River at the 

 International Boundary varied from 1.7 mg/L (May 17) to 2.6 mg/L 

 (January 6) (Figure 6). 



2.8-r 



2.6 



2.4 



- 2.2 - 



2 -■ 



1.8- 



1.6 



• • 



• • 



• • 



1988 



1989 



Figure 6. 1988 Boron Grab Sample Data, East Poplar River at 

 International Boundary. 



