There was general agreement that fine-grained sediment accumulates on the 

 floors of canyons of moderate size and energy, such as Lydgnia, but not on the 

 floor of the best known large, deep, and high-energy canyon, Oceanographer. 



■ Is there evidence of contaminant accumulation, based on: 



Y/N C 



1. Sediment resuspension 



(stripping, scavenging)? Y L,0 



2. Lead-210 and plutonium-239/-240 



inventory? Y L 



3. Lead-210 and plutonium-239/-240 

 concentration? Y L 



4. Trace metals? Y L 



5. Hydrocarbon concentrations? N"^ 



^except Hudson canyon, where sludge dumping occurs 



Sources: Bothner is source for the first four data categories, Boehm for 

 hydrocarbon data. 



It was generally agreed that there is a high potential for contaminant 

 accumulation in canyons where fine-grained sediments are accumulating. This 

 is most clearly the case in Lydonia Canyon where resuspension of sediment 

 augments contaminant scavenging by fine sediments." 



*See also reviewer comment in Appendix A. 



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