SECTION D NO2-M 



• O •! 



LEGEND 



I I O- 0.10 MgA/l 



I 1 10-0.20 



0.20- 0.30 



0.30-0.40 



OVER 0.40 



TO- 68* «0* 59* SO* «* 



TO- eS* 80- 35" 5<r «9' 



Figure 2. Vertical dislribution of nitrite-nitrogen, sections A, B. C. D, and D'. 



41 



