1 DR. BOTHNER: I've got that data with me, Nancy, and I did look at 



2 it and I didn't find anything that was striking, but what I did in each 



3 case was to compare--we took three samples. We took samples at three 



4 different occasions at each of those sites. 



5 The data that I showed was only those metals that showed a 



6 consistent pattern, that is every time we sampled at station 7, we found 



7 higher metals that we did at station 4. At station 8 compared to 



8 station 6, my recollection, and this is just a recollection, is that it 



9 wasn't a one for one consistent pattern, and so I didn't illustrate it. 



10 DR. MACIOLEK: So it's not as much of a difference? 



11 DR. BOTHNER: I think the variability at 6 and 8 was so great that 



12 you couldn't make that good a comparison. I would like to say there is 



13 an opportunity to take some of those same cores and measure the lead-210 



14 and the plutonium because of the half lives of both and that is 



15 something I'm very interested in doing. 



16 I think that, more than the trace metal concentrations of ambient 



17 trace metals, will tell us a lot more about the potential of scavenging 



18 in that deeper part of the system. 



19 DR. KRAEUTER: Two questions. One, on your last couple of slides 



20 showing the active reworking of the bottom sediments, it looked like the 



21 two different techniques or two different isotopes are measuring a 



22 different mixing rate, can you explain that? 



23 The curves are substantially different in the kind of reworking 



24 that's going on down on the bottom. Are they two different areas? I 



25 couldn't quite piece that together. 



26 DR. BOTHNER: In the report that we submitted as part of the 



27 Lydonia Canyon experiment, there is a fair amount of discussion about 



28 modeling that mixing curve. Because the half lives are different, that, 



29 I think, explains in part the different shape. 



30 Actually, we were quite surprised to note that when you apply the 



31 models for mixing in both locations, that although the mixing is greater 



32 in Lydonia Canyon in the absolute sense, if you apply the regional 



33 arrows bars, they come out to be very similar. 



70 



