1 By the way, in this particular study all of these samples were 



2 done by hand-corer. In these shallower water depths we find that we can 



3 get better cores, especially when we have a lot of sand bottom, working 



4 with divers with hand-corers than we can with surface grabs. 



5 This problem of bioturbation really makes for interesting work 



6 when you're doing laboratory work. If you're trying to do sediment 



7 exposures in the laboratory where you're overlaying a sediment with a 



8 contaminated sediment, if you don't watch out within 2 or 3 days your 



9 actual exposure levels in the surface few centimeters will be greatly 



10 reduced because of the reworking of the sediments. 



11 A lot of people overlook this. The other thing that was done in 



12 this study and in the Alabama study also, is that we are routinely now 



13 doing both fine fraction and bulk sediment samples for comparison. 



14 I think a lot of the lead came off of this from the Georges Bank 



15 work that was done a number of years ago, using the fine fraction to 



16 have a more sensitive measure of being able to detect increases. So, in 



17 all of our samples we are doing both in barium, chromium, iron in this 



18 case. 



19 You can see the fine fraction is 23,200 ppm, bulk 19,500. We've 



20 got this kind of data for all of the stations. 



21 To finish up this, just real quickly talk about the Mobile Bay 



22 study, this was about 5 miles off of the mouth of Mobile Bay here. This 



23 is block 132, located right off of the main fairway here. 



24 We figured out that-- I'm trying to remember what is was. I think 



25 in 1 day the Corps of Engineers was dumping something like--I can't 



26 remember how many wells a year we could drill to be equal to 1 day of 



27 their dumping out here and it's been a little bit of a concern of ours 



28 in conducting this study. 



29 We've set up additional control stations over here toward their 



30 disposal site to see if we could intercept any of the stuff from their 



31 location because of the size of their barge loads. I think we came up 



32 with something like 7,000 cubic yards of material from our total well, 



33 and they're dumping 42,000 cubic yards a day. 



54 



