12 



The relation between TDS and specific conductance generated from data collected from 1975 to 



1 994 is as follows: 



TDS = (0.635 X specific conductance) + 15.38 

 (R2 = 0.87, n = 493) 



3.2.5.2 Boron 



During 1 994, boron concentrations in the East Poplar River at International Boundary varied from 

 0.60 mg/L (March 16) to 2.10 mg/L (June 6) (Figure 3.6). 



t!£! 



s 



O 

 CO 



2.50 

 2.25 

 2.00 

 1.75 

 1.50 

 1.25 

 1 00 

 0.75 

 0.50 

 25 



0.00 

 1994 



Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec 1995 



Month 



Figure 3.6 Boron Concentrations for 1994 Grab Samples from East Poplar 

 River at International Boundary. 



Three-month FWCs for boron for the period of record are shown in Figure 3.7. The short-term 

 objective of 3.5 mg/L boron was not exceeded for the period 1975-1994. The similarity in shape 

 between the TDS and boron plots (Figures 3.4 and 3.7) is a strong indication of the influence of 

 discharge on FWCs. 



