14 



Table 2-2 

 NERBC Contaminant Classification 





Low 

 (ppm) 



Moderate 

 (ppm) 



High 

 (ppm) 



As 



<10 



10-20 



>20 



Hg 



<0.5 



0.5-1.5 



>1.5 



Total PCBs 







>1.0 



DDT 







>0.5 



Pb 



<100 



100-200 



>200 



Cd 



<3 



3-7 



>7 



Cr 



<100 



100-300 



>300 



V 



<75 



75-125 



>125 



Zn 



<200 



200-400 



>400 



Ni 



<50 



50-100 



>100 



Cu 



<200 



200-400 



>400 





Class I 



Class II 



Class III 



% Oil & Grease 



<0.2 



0.2-0.75 



>0.75 



% Volatile 

 Solids 



<5.0 



5-10 



>10 



% Fines (silt & 

 clay) 



<60 



60-90 



>90 



Sediment Capping of Subaqueous Dredged Material Disposal Mounds 



