1 The assumptions that we used to handle the trap data are really as 



2 follows. When you make these assumptions, there are two things, I 



3 guess, you can do. You can say all the barite came from the rig if you 



4 wanted to, or you could say that part of it came from the sediment, a 



5 small amount, and that's really what we did. 



6 It doesn't really change the results that much, but we felt this 



7 was a little bit more precise. We assumed the trap contained low 



8 gravity solids, this clay silt, from the mud, the barium sulfate from 



9 the mud and some organic matter from the mud. 



10 It also contained naturally occurring low gravity solids, 



11 naturally occurring barium sulfate and naturally occurring organic 



12 matter. Then, if you assume that the ratio of these material s--the low 



13 gravity solid to barium sulfate and organic matter to barium 



14 sulfate--for the naturally occurring materials are constant. 



15 Then, also, if you say that those same things are constant in the 



16 mud over a specific sampling period, with three sampling 



17 periods — sampling period one, two, and three--you take the mean value of 



18 low gravity solids to barium sulfate for those periods, then you can do 



19 some pretty simple material balance calculations. 



20 You can determine what is in the trap and what is in the trap from 



21 the mud and what is in the trap from natural sedimentation rates. I can 



22 go over that in detail with anybody that wants to, later. 



23 (Slide) 



24 This shows the percentage of mud in the trap solids. In other 



25 words, what percent of the trap solids came from the drilling operation. 



26 That is what this tells us. These are different. This is in the canyon 



27 itself, this curve. This one is at the canyon, but only 150 feet from 



28 the surface. This one is 3,600 meters from the canyon at 150 feet. 



29 This one is 1,500 meters from the rig at 150 feet and then 1,500 meters 



30 from the rig at 20 meters deep. 



31 This is percent mud solids in the total solids. You can see less 



32 than a tenth of a percent of all the solids in the trap, in the canyon 



33 trap, came from the rig. Right around the others, most of the others 



34 fall around one percent, a little bit, you know, well, maybe between 0.2 



163 



