DRAFT -15- much leeway for exposure from other pathways. This is very significant because potential doses via the terrestrial foodchain can exceed those due to external exposure. Housing constructed in area 2 (Case 4a, 4b) along the lagoon road reduces the external exposure relative to Case 5 and 6 by approximately .25% depending upon which remedial action is considered. Placing crushed . gravel around the houses is commonly done and is easily accomplished. The soil removal and replacement, however, is a mere difficult action to implement. Living in residences already established on Bikini Island (Figure 3, are 1 in Figure 2) leads to the smallest external exposure on Bikini Island (Case 2, 3a, 3b); the 30 year doses for these cases range from 4.3 to 4.0.rem. Living patterns on Eneu Island lead to the lowest external exposure doses. The first year dose of 0.12 rem and the integrated 30 year dose of 2.9 rem are nearly a factor of two lower than the Bikini Island options. The Eneu living pattern, therefore, has more flexibility for potential exposure via other pathways without exceeding Federal guides. -2. Inhalation Pathway No air sampling data was taken during the 1975 Bikini survey. ,Some open field aerosol measurements have been taken during previous work conducted at Bikini Atoll (21, 22). Because of the sparcity of the data, however, and also because of the lack of data concerning resuspension processes in the atoll environment, the average concentrations of Pu in the soil have been used in a mass loading model to predict the doses ———_ 5009890