likely, that an addition 10 curies of 729+2*°py (associated with soil) could be brought to Runit Island for disposal. If this contaminated soil were spread on the northern end of Runit Island, plutonium would be expected to leach from the soil to the groundwater and subsequently reach the lagoon. The rate of remobilization would be similar to the rates presently assessed from available island data. Our best estimate, based on average groundwater residence times on Runit, present plutonium concentration in soil and groundwater, is that it will require more than 10° years to remobilize the present plutonium inventory from the island soil to the groundwater by natural processes. It is estimated that presently 0.23 mCi of 239*24°py annually migrates to the lagoon via groundwater at Runit. 0.23 mCi represents less than 0.01% of the current plutonium inventory in the water in the entire lagoon.¢ Therefore if the Runit terrestrial plutonium inventory were doubled (i.e., an additional 10 Ci), the groundwater concentration would eventually double and then contribute an estimated 0.02% to the lagoon inventory as measured in 1972. We have found that the concentrations of plutonium in the lagoon water has been essentially non-varient over the last 10 to 15 years since testing stopped. However, we are not in a position to predict what the lagoon inventory will be in hundreds and thousands of years from now. The concentration of plutonium in fish is related to the concentration of plutonium in water. Therefore an increase in water concentration of 0.01% will increase present fish concentrations by 0.01% and subsequent dose to man through consumption of marine products by 0.01%.