This option does not specify action against radioactivity in soil of the islands such as ALICE, BELLE, and CLARA, nor does it recormend that residences be built on JANIT. By implication, therefore, rescttlement of JANET would have to wait for radioactive decay and weathering processes to reduce contaminaticn levels to acceptable values on these islands. Since the predominant isotopes, 1376, and 705, each have half-lives of thirty years, the waiting period could be slightly more than one generation for each factor of two reduction in dose. On the other hand the reduction could proceed at a somewhat faster rate. Or . marrow JANET, reducing the. maximum annual child's bone/dose from 0.72 rem/yr (Table 4, Case D-I) to the guide level of 0.25 ren/yr through natural decay of the 90 about Sx would theoretically require a wait of/50 years considering only radiolozicz decay. It is not expected that such a reduction will actually take thet lone. Option IV a. All of Option III a, c, d, e, and f£, plus: b. Return to JANET and build residences and community center in locations shown on the Master Plan. c. Remove a minimum of 30 cm of soil in ail areas where pandanus and breadfruit are to be grown on JANET; import clean soil in which to establish these plants; or import pandanus and breadfruit from the southern islands. If these actions proved to be as effective as the theoretical predictions, this would permit return of the Enjebi pecple to their island. It should be emphasized, however, that even with the above actions, predicted doses are near or slightly above the criteria for annual exposures and also above the 30 year criteria. The levels are expected to be well above those of Option III i)