13 



Table 2-1 



New England River Basins Commission (NERBC) 

 Classification of Dredged Sediment (NERBC 1980) 





Class I 



Class II 



Class III 



Percent oil and grease 

 (hexane extract) 



<0.2 



0.2-0.75 



>0.75 



Percent volatile solids 

 (NED method) 



<5 



5-10 



>10 



Percent water 



<40 



40-60 



>60 



Percent silt/clay 



<60 



60-90 



>90 



LEVEL OF CONTAMINATION 





LOW 



MODERATE 



HIGH 



As 



<10 



10-20 



>20 



Cd 



<3 



3-7 



>7 



Cr 



<100 



100-300 



>300 



Cu 



<200 



200-400 



>400 



Hg 



<0.5 



0.5-1.5 



>1.5 



Ni 



<50 



50-100 



>100 



Pb 



<100 



100-200 



>200 



V 



<75 



75-125 



> 125 



Zn 



<200 



200-400 



>400 



Monitoring Surveys of the New Haven Capping Project, 1993-1994 



