1 DR. RAY: I think the rapidly settle-able materials, that takes in 



2 both cuttings and the settle-able fraction of the mud. When the mud 



3 partitions, part of the fine particulates go off into the water column 



4 but some of it goes straight to the bottom and those settle-ables become 



5 settle-able solids. 



6 DR. AURAND: If anybody cares to go ahead, there is a plume model 



7 in the NAS muds and cuttings report and it, in fact, shows two transport 



8 mechanisms. There is a long-lived surface plume which is the ultimate 



9 mechanism for the transported distance and then there is another plume 



10 that goes straight down into the bottom. 



11 What we are really talking about here is the plume that goes to 



12 the bottom. There may, in fact, be some words in there to explain the 



13 difference between them. 



14 DR. GRASSLE: It might even be accidental discharge or whatever, 



15 if somebody drops a wrench. 



16 DR. AURAND: This would exclude the accumulation of rapidly 



17 settling material in the canyons. Then, "C", John, I would assume that 



18 means direct burial effects are not significant? 



19 If you are not going to have the pile, then you don't have to be 



20 too concerned about direct burial effects in the canyon? Yes? No? 



21 MR. VILD: In the canyonheads. 



22 DR. AURAND: Well, wherever you put the thing. 



23 MR. VILD: We are trying to preclude direct and immediate burial. 



24 DR. KRAEUTER: Burial and smothering, maybe. 



25 DR. TEAL: You want to pile the sediment up slower than the 



26 animals can dig out. 



27 DR. KRAEUTER: Right. 



28 DR. AURAND: Which takes care of this one; in the near field, it 



29 takes care of those (indicating). 



30 If you have the set-back, does it do anything else for you? Are 



31 there any other concerns which-- 



32 DR. TEAL: Yes, there are a number of other things. It gives 



33 added dilution to anything that is going to be suspended in the water 



34 before it reaches the canyonhead, so that if the flow is down-canyon at 



285 



