RRER THIRTEEN - SUMMER 



0.01 



100 - 



0.] 



I I I I 1 1 1 



200 - 



100 

 ^-4-0 



■100 



-200 



300 



-300 



400 - 



-400 



500 ? 



0.01 



I I I I I I 



NITRATE (pg-a/L: 



10 



-1 r 1 . I I 1^ 500 



100 



Figure A. 9. 



127 



