1 Iron is pretty constant, you see a little deviation in the lead 



2 ■ levels, at least in part per million here. Mercury, one little spike 



3 here, but it stays pretty flat. 



4 In a couple of these studies one of the other things of note, and 



5 it's because it's tying back to the regulation, for the most part we're 



6 not finding that mercury covaries with barium. This has been one of the 



7 raging regulatory issues; that is, the trace levels of metals in barite, 



8 especially mercury and cadmium, because there's plans to put regulations 



9 on those levels. 



10 With sediments, with distance and also in the bioaccumulation 



11 work, we are not finding any correlation between the mercury present and 



12 the barium levels. Anyway, in these two view graphs it tells you an 



13 awful lot of what was in that study. 



14 I think takes care of it. That was fast. Thank you. 



15 DR. MACIOLEK: Were there any questions for Jim? 



16 (No response.) 



17 I'd like to remind the speakers and people asking questions to 



18 please give their name before hand, 



19 DR. TEAL: Cadmium did covary with barium, it looked like it did? 



20 DR. RAY: We had in the Molino study in California, there was some 



21 covariance with cadmium and zinc in the first two stations, beyond that 



22 you couldn't see it. In those first two stations we were seeing some 



23 covariance with the barium, but with the others we weren't seeing that. 



24 DR. BUTMAN: Why would you expect those to covary with barium? If 



25 the base metals adhere to the fine-grained particles, barium acts 



26 differently than those natural fine-grained particles anyway. 



27 DR. RAY: Part of the thinking behind that is that from a 



28 regulatory standpoint we know that barite can range--clean barite 



29 usually will have less than 1 ppm mercury, 1 ppm cadmium as part of the 



30 barite tied up in the matrix. 



31 Dirty barites, you can get up to 4 or 5, as high as 10 ppm in some 



32 cases, depending on what area in the world your barite comes from. As a 



33 regulatory thing the agencies have decided that they want to regulate 



34 the trace amount of mercury and cadmium that are in barite. 



56 



