46 



Mill River 



c 

 d) 

 o 

 c 

 o 

 O 



>3000 

 2500-3000 

 2000-2500 

 1500-2000 

 1000-1500 



N=10 





i 



800-1000 







600-800 





400-600 



i ■ i 









<400 





1 1 1 1 — 



20 40 60 80 



Percent of Samples 



100 



□ Zn 



iCu 



□ Cd(x100) 



E 



Q. 



a. 



c 

 o 



c 



0) 



o 



c 

 o 



o 



Quinnipiac River 



>3000 

 2500-3000 " 

 2000-2500 



N=6 





i 



1500-2000 







! 



1000-1500 







> -.' •;- ' &.»,:.( 



800-1 000 









600-800 







I 



400-600 







<400 





i i 



20 40 60 80 



Percent of Samples 



100 



□ Zn 



iCu 



OCd(x100) 



Figure 4-1. Trace metal (Zn, Cu, Cd) concentration frequency distributions of samples 

 from the Mill and Quinnipiac Rivers 



Sediment Core Chemistry Data Summary from the MQR Mound, August and December 1991 



