45 



contaminants. In the following comparisons of CLIS reference area data to regional data, 

 values are normalized to the percent silt and clay content because of the regional variation of 

 grain size and organic content (Table 4-2). 



Table 4-1 



Metals Concentrations (ppm Dry Weight) in Sediments Collected 

 at NLON, CLIS, and WLIS in 1986 and 1987 



Metals 



Cd 



Zn 



(ppm dry weight) 







NLON-REF 







1986 



<3 



45 ± 27 



1987 



ND 



NA 



CUS-REF 







1986 



NO 



110 ± 4 



1987 



ND 



121 ± 9 



2500W 







1987 



ND 



153 ± 7 



4500E 







1987 



ND 



148 ± 10 



WUS-REF 







1986 



<3 



141 ± 52 



1987 



ND 



135 ± 9 



2000S 







1987 



ND 



99 ± 18 



2000W 







1987 



ND 



215 ± 2 







All samples were 0-2 cm in depth. 

 NA= Not analyzed ND= Not detected 



Monitoring Cruise at the Central Long Island Sound Disposal Site, June 1991 



