April 11, 1969 GUIDELINES To date, no radiological criteria have been provided by AEC/HQ for the Bikini cleanup operation. Unofficially, however, the Division of Operational Safety, AEC/HQ has recommended that criteria be based on AEC Manual Chapter 5170, Appendix 5170. This chapter provides for the disposal of surplus property including radioactively contaminated equipment. Based on this chapter, the following guidelines are recommended: a. On all islands, every reasonable effort shall be made to reduce the levels of contamination to the lowest practicable level. b. For those materials where removable surface plutonium levels exceed 500 disintegrations per minute per 100 square centi- meters, the material should be disposed of as radioactive debris. c. For those materials containing induced radioactivity showing contact readings measurably above local background, the materials shall be handled as radioactive debris. The application of the guidelines should be tempered with judgment and common sense. Because of the relatively large contribution of external exposure to the total exposure which will be received by the returning natives, it is most important to remove to the extent practicable all radioactive debris to which the natives might have access. This is particularly important on those islands where the natives will reside on a full time basis. On Eneu and Bikini, a careful ground monitoring radiological survey will be conducted as each new road or planting swath is cut. Any radioactive debris found during cleanup will be disposed of by dumping in one of three designated areas in the lagoon or outside the lagoon in depths of 25 fathoms or greater. Should any anomolous "hot spots" be found, the on-site AEC Radiological Safety Advisor will recommend appropriate action to the Commander. The specific location of the three designated disposal areas shall be left to the discretion of the Atoll Commander but must meet the following criteria: a. The minimum distance from the nearest islet will be one mile, — b. The minimum water depth will be 25 fathoms.