1 DR. KRAEUTER: Change that to the last 3 or 4 thousand years. 



2 That's even more important, though, because sea level was near its 



3 normal level. 



4 DR. BUTMAN: So, how about we say in the--do you want to put a 



5 time on that? 



6 DR. TEAL: January 4, 2000 BC. 



7 (Laughter) 



8 DR. KRAEUTER: Then we can say something about rates. Do you know 



9 how deep the sediments are and things like that? 



10 DR. BUTMAN: All right. No more discussion on that one in the 



11 interests of moving along. 



12 The other question I asked is: What is the potential you could 



13 say contaminants accumulate in canyons? Is this different from--the 



14 subtle distinction between sediments accumulating is the resuspension 



15 issue that sediments can strip contaminants from the water column. 



16 So, the evidence here is we have a lot of direct evidence of 



17 sediment resuspension. We have sediment trap measurements. We have 



18 more ray and light transmission observations, beam attenuation 



19 measurements. We have current measurements which show that they are 



20 stronger than the threshold for the existing sediments. 



21 At least, in Lydonia, we know that there is indirect evidence that 



22 the process that can cause stripping is occurring. I guess you would 



23 probably call that "direct," also. We have also seen the currents are 



24 very strong in Oceanographer, but whether they actually accumulate 



25 there--and, thus, stripping--we don't really know. 



26 As Mike just said, we need to analyze some additional sediments 



27 from an erosional canyon where the fines aren't accumulating to see 



28 whether there may be still some stripping and contaminants. 



29 Then the two pieces of chemical and geochemical information from 



30 Lydonia that say that's actually occurring is both the lead-210 



31 inventory and the lead-210 concentration per unit mass. 



32 DR. BOTHNER: You might add the fact that plutonium shows the 



33 same, not just one isotope but two, that helps with this. 



34 DR. BUTMAN: What is the-- 



197 



