Soil Cleanup Planning arithmetic error and the concern was unfounded.) The new LLL dose assessment was reviewed by the Bair Committee and was the basis for their recommendations of revised levels for agricultural and visitation/ food-gathering islands.94 The arithmetic error was not discovered until after the new guidelines were issued. The new guidelines were based on estimated doses from time spent in various activities, such as food gathering or residence, on various islands with different levels of repay Ses COMMITTEE RECOMMENDATIONS® TRANSURANIUM ELEMENTS iN SOIL cot, aahaaai tra The model for the LLL dose assessment and Bair Committee recommendations assumed that the peopije spent 60 percent oftheir time on residential islands, 20 percent on agriculture islands, and 5 percent on food-gathering islands. It also assumed that 65 percent of the coconuts and all of the other food consumed would be grown on residence islands. An estimated 25 percent of the coconuts consumed would come from agriculture islands and 10 percent from food-gatheringislands. The cleanup guidelines proposed removal of concentrations exceeding 40, 80, or 160 pCi/g as appropriate. The resultant island averages, however, would be lower. Dose calculations based on these guidelines were estimated at 10.3 millirad per year from inhalation and 2.7 millirad per year from terrestrial sources for a total of 13 millirad per year to the bone. This exceeded the proposed EPA guideline of 3 millirad per year; however, it was well within the International Commission on Radiological Protection dose limit to bone which was equivalent to 30 millirad per year. ey iy ae contamination (Figure 6-15). PRIORITY** ISLAND TYPE SOIL CONCENTRATION*?**® AREA t VILLAGE ISLANDS <= 40 pCi/g W/4 HECTARE iI AGRICULTURAL ISLANDS < 30 pCi/g V2 HECTARE Hl PICNIC ISLANDS © 160 pCi/g 1/2 HECTARE " HEAVILY QUALIFIED DUE TO UNCERTAINTIES. NO ABSOLUTE ASSURANCE CAN BE GIVEN—-IN THE OPINION OF THE ADVISORY GROUP, CLEANUP TO THESE LEVELS WILL RESULT IN AVERAGE TRANSURANIC DOSES COMMENSURATE WITH PROPOSED EPA GUIDELINES. *e IF RESOURCES ARE EXHAUSTED, SOME ISLANDS MAY NOT BE CLEANED UP; FINAL OOSE ASSESSMENT MAY INDICATE THAT THESE ISLANOS WILL HAVE TO BE PERMA. NANTLY QUARANTINED. *** WITH 70 PERCENT CONFIDENCE, FIGURE 6-15. DOE DOSE. S a SoTatee Se rte naire we SG Se ae ees!