44. 



the bottom of the well. How much pumping is necessary to be sure 

 that you exhaust the fluid in the bore hole of the well and that you do 

 get a sample of what is going by? It is not nearly as simple as it 

 seems to be . 



DR. HUBBERT. How are you going to get a sample in the 

 wells around the cribs? 



MR. PIPER: There may or may not be some seepage from the 

 percolating waste. But you can have fluid go right by the end of a 

 well and not collect a drop. It is the hardest thing in the world to 

 sample fluid moving in unsaturated material. 



DR. GILLULY: You said this pear-shaped area of poisoned 

 soil doesn't contain anywhere near a major fraction of the material 

 that was fed into it. What happened to the rest of it? Where did it 

 go? 



MR. PIPER: Some of the missing material may be tied up in 

 sludge in the bottom of the crib, and it is physically impossible to 

 drill and sample the crib bottom to get a good quantitative measure- 

 ment of that sludge. But even making allowance for that, we haven't 

 demonstrated at Hanford that there is anything like complete inter- 

 ception by adsorption. 



DR. E. W. ROEDDER: Could you have relatively uncontami- 

 nated material underneath the pear-shaped mass? 



MR. PIPER: Yes. The bottom of the mass is substantially 

 above the water table. 



DR. ROEDDER: Completely uncontaminated? 



MR. PIPER: Yes. 



DR. GRIGGS: I asked a question as to whether contamination 

 occurs in the ground water. 



MR. PIPER: Not directly under the areas of absorption that 

 have been tested by drilling. Contamination has been found in a few 

 ground-water samples. 



DR. HAWKINS: Where were they located? 



