27. 



DR. DAVID T. GRIGGS: I would like to ask a question about 

 costs. We are given in the Johns Hopkins report a cost of 3 5 cents 

 to $2 a gallon for waste of this general type. Of course, you named 

 a great variety of waste, and I wonder if we could have a cost on the 

 last two that you talked about. 



DR. CHRISTY: Nickel ferrocyanide ? 



DR. GRIGGS: Nickel ferrocyanide, and then you spoke of a 

 new plant. 



DR. CHRISTY: On the cost of tank installation, the more tanks 

 that are built the lower are the unit cost. There are also ways to in- 

 crease the capacity of the tanks, and in doing this, the cost is reduced 

 as the tank design and the number of tanks are constructed are opti- 

 mized. 



DR. GRIGGS: Then I ask about concentration. You talked about 

 a new process that results in greater concentration. 



DR. CHRISTY: I don't have with me the cost of the essential 

 material which would be needed for the nickel ferrocyanide. But on 

 storage, unit volume waste storage costs are down in the range of 

 20 cents a gallon. However, when you self-concentrate as is the cur- 

 rent development, condensor equipment and cribs are added costs. 

 So I would say there is some increase in that 20 cents a gallon which 

 would be possibly five to ten cents. 



DR. GRIGGS: On the other hand, you have less gallons to store 

 because you have concentrated it. 



DR. CHRISTY: That is right. 



DR. GRIGGS: Could you say what final waste storage costs will 

 be per gallon using self- concentration and nickel ferrocyanide. 



DR. CHRISTY: I would like to repeat that both of these develop- 

 ments are in their infancy, and anything said will be very preliminary. 

 But I would guess that something on the order of 25 to 35 cents per 

 waste space gallon will be the cost by utilizing self-concentration. 

 There is yet to be developed an ideal way of agitating the sludges in 

 these huge tanks, so we can't calculate what the final cost will be. 



