■o 



I 



CO 



"v 

 CO 



CO 



<L> 

 CO 

 CO 



"O 



u 



4 - 



3 - 



2 - 



85 



86 



87 



88 

 Year 



89 



90 



9 1 



Figure 6a. Cadmium decreasing at Long Island Sound sites. 



Figure 6b. Silver decreasing at Delaware Bay sites. 



24 



