16 



Figure 3. 1 1 : Daily Boron Concentration, 1 989 to 1 999; East Poplar River at the 

 International Boundary (regression-derived data) 



3.00 



2.50 



0.00 



Dec-88 Dec-89 Dec-90 Dec-91 Dec-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 



