Given these entire island an exclusion area—off lim- current conditions, it must be assumed its to all people, or (2) conduct a cleanup surrounding coral matrix, that pure plutonium particles of respira- campaign which will eliminate the "hot- ble size are now also present on the sur- spot" plutonium problem and remove face or may be present in the future as whatever amount of soil is necessary to weathering effects oxidize and break reduce the soil plutonium concentration down the larger particles, to a level comparable to other northern Lung dose assessments for this area, therefore, islands. As an indication of the volumes must be based on inhalation of pure plu- of soil involved, removal of a 10-cm tonium particles rather than those hav- thick layer of topsoil in the area in which ing the average plutonium content of the "hot spots" have been detected involves soil, approximately 17,000 m? of material. Further removal of soil to reduce the The potential health hazard via the inhalation pathway is sufficiently great to maximum plutonium contamination levels dictate two basic alternatives for reme- to 50 pCi/g or less involves an additional dial action for this island: Table C. 25,000 m°® of material, (1) Make the 30-yr integral doses from all pathways compared to U,5, external background dose. 30-yr integral dose, rem? Location Unmodified soil case Bone W.B. Modified soil case” W.B. Bone Enewetak Atoll living pattern II] (JANETcurrent conditions) 11 80 8.9 78 25 4.2 23 Enewetak Atoll living pattern HI (JANET- pandanus and bread- fruit imported) Enewetak Atoll living pattern III (JANETall agriculture confined to southern islands) Enewetak Atoll living pattern I (southern islands) U.S. background only 6.5 4,2 7.0 1.9 4.7 1.0 3.8 1,0 3,8 3.0 3,0 3,0 3,0 “Sum of all pathways for the Enewetak living patterns (i.e., external, inhalation, marine, and terrestrial), BSoit modified by placing 2 in. of clean gravel in the village area and plowing the agricultural area. “Based upon background of 100 mrem/yr at sea level. I-3