SILICA 



COLUMBIA RIVER at NORTHPORT, 1910- 1911 esssaai 

 II II II II 1951 - 1952 I 1 



SULFATE (504) DISSOLVED SOLIDSTOTAL HARDNESS TOTAL ALKALINITY 



NITRATES (NOi) 



FIG. 43 



COLUMBIA RIVER at NORTHPORT, 19 10- 191 1 = 



II II II II 1951-1952 E 



IRON (Fe) CHLORIDESCcn No+K 



Ca 4. Mg 



FIG. 44 



69 



