1 percent, the drop off and then this general increase out here with 



2 distance. 



3 Mercury in parts per billion, you see a spike in here directly 



4 below the rig and then the gradient out. Just to be fair and show you 



5 that you don't have nice gradients all the time when you're working with 



6 it, you go out on another transect you see a drop here and you see a 



7 spike here. 



8 One of the other problems in development fields is you don't have 



9 single point source. A lot of times you'll have satellite wells drilled 



10 and other things like this, and it really complicates the picture when 



11 you try to interpret your data, especially in the Gulf of Mexico to try 



12 to and find any area that is not influenced by another is rather 



13 difficult, especially in development areas. 



14 Again, you can see these spikes, you can see the iron with 



15 distance and a lot of times this can be--you have to go back and take a 



16 close look at your grain size distribution to see if it answers the 



17 reasons why these iron percentages change and ratios change. 



18 Again, there is a little increase in mercury with distance, here 



19 chromium, the distance. Sometimes you get jumbled patterns like this 



20 and you have to look at all of the data to really ferret that out. 



21 The one other thing in the data that's important to look 



22 at--anyway, what this is showing, this is barium concentration, chromium 



23 and iron with distance, 10 meters, 150, 750, 5,000 meters from the 



24 source. These are core samples, to 1 centimeters, 1 to 2 centimeters, 



25 3 to 6, 6 to 7, 9 to 10--8 to 10, and these are in percent. 



26 Depending on the areas you are located, the bioturbation zone can 



27 vary in depth, in some areas it only goes down a few centimeters and one 



28 of the earlier studies we did, anywhere from 7 to 10 centimeters you can 



29 still see active reworking and redistribution of the surface 



30 contaminants being worked down into the sediments. 



31 Here you see down to 2 centimeters, this is in the 2 percent 



32 range. Then when you get down to that 3 to 6, it is dropping down to .9 



33 percent. You've got a spike down here back up to 1.8 percent, this is 



34 directly beneath the rig. 



53 



