1 DR. AURAND: A standard assumption appears to be to minimize the 



2 surface area of the column as the oil rises from blow-out point through 



3 the water column and then spreads. The assumption is that most of the 



4 exchange occurs in the surface layer as it spreads. 



5 John's comment is that he is not sure he accepts that. 



6 DR. KRAEUTER: Particularly concerning the potential effects on-- 



7 DR. RAY: What did the data from the Ixtoc study show, the water 



8 work, because they did a lot of water column profiling for composition 



9 and concentration? It has been too long since I have looked at it. 



10 DR. TEAL: It's been a long time since I looked at it, too. What 



11 Jerry said here this afternoon, when he was doing all this stuff, was 



12 something to the effect that there was relatively little of that oil 



13 that got into the water. 



14 I can remember seeing the contours of oil in the water. It seems 



15 to me they were parts per billion, downstream. 



16 DR. AURAND: It was the last thing he addressed this afternoon. 



17 The three things I wrote down was that the surface, no mechanism that he 



18 knew of to transport oil to the bottom in any quantity. I'm not sure 



19 that addresses the issue of the oil that starts at the bottom and comes 



20 up to the water column. At Ixtoc, there was not much oil on the bottom. 



21 DR. TEAL: There was very little oil on the bottom at Ixtoc and 



22 there wasn't a whole lot in the water. Most of it did go to the surface 



23 and spread out over the surface area. 



24 DR. BUTMAN: How deep was the water at Ixtoc? 



25 DR. RAY: A little over 200 feet. The big well head was about 180 



26 feet or something like that, as I recall. 



27 DR. TEAL: It was a little shallower, I thought. I suppose you'd 



28 probably expect a little more to be in the water. In the modeling we 



29 were talking about, they assumed that all the water got into only the 



30 top 10 meters of the water. I thought that was a method to get a worst 



31 case scenario, net dilution of the oil by confining it to the top ten 



32 meters. 



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