oS fo (3 oe RADIOLOGICAL CLEANUP PLAN FOR THE ENEWETAK ATOLL al I. - - Te lessee ssalnt V8 beset co .te “ors - ai Cit mr, See tee EES Corres “+ PURPOSE TSF SeaE Coon 8, 7 . Staak. oo This Plan serves as the basis on which the radiological cleanup of Enewetak Atoll will be conducted. (Nonradiological cleanup is included only where necessary to differentiate the two.) The Plan attempts to structure a cleanup which incorporates the Atomic Energy Commission (AEC) Task Group Recommendations (Reference 1, Vol. II, Tab B) and other established radiation principles and practices with engineering methods and technology available for cleanup within the major constraint of limited funds authorized by the Congress. It covers the cleanup of contaminated soil and debris in accordance with the Environmental Impact Statement _.- (EIS, Reference 1), and the radiation safety necessary to. accomplish these endeavors in a satsifactory manner. eee oe “popeFoR eg eB en Il. - BACKGROUND -. ee Ue atu lTaist: ITY wee 7 wt “y% rene tan Bape psa Sos - Pe vaaee weed wn Lo LI sigur. > sbi ont ee v -, eds te tt. as bebitragt: “* We eae ~ mnt, + hetne nd 4+ fee eye “An AEC Task Group evaluated the radiological hazards ‘at Enewetak Atoll and recommended (Reference 1, Vol II, Tab B) that "all radioactive scrap metal and contaminated debris now or later identified" and any soil which has a Pu concentration greater than 400 pCi/g should be removed as part of the Cleanup. The Task Group encouraged removal of soil with Pu concentration in the range of 40-400 pCi/g where practical, but since such soil was deemed to pose a lesser hazard, circumstances were envisioned which might justify leaving it in place. Thus, The Task Group also recommended that decisions on soil removal be made “on an individual case basis" when Pu is in the range of 4° 400 pCi/g. .2. . 2 fe a.n oct : The "Case 3 Cleanup” as described in Reference 1 is to accomplish a cleanup which conforms with the Task Group Recommendations (See e.g. Reference 1, Vol I, pg 5-18). Thus, it is incumbent on Cleanup to radiologically ' monitor all scrap and debris which concievably might be contaminated, and to ' classify soil according to its Pu concentration as either (1) greater than . 400 pCi/g (mandatory cleanup), (2) less than 40 pCi/g (no cleanup required), or (3) in the range of 40 pCi/g to 400 pCi/g (negotiable cleanup). - III. DEBRIS CLEANUP ae A. GENERAL ’ Poot au ley fuctd : Cee sah is 92 2 2 hee . . oF a TA sic taegeeigue 274 sett cnet ni Iseig ml rt hs iiusee yd Sean ad flag tins 1. An aerial radiological survey of Enewetak Atoll was conducted from an elevation of about 50 ft as part of the AEC Enewetak Radiological -. Survey (the "AEC Survey," Reference 2). The aerial survey data were used to calculate an estimated average exposure rate over each island. Results of the calculations (Reference 2, pg 80) permit dividing the islands of the Atoll into two groups: \ those in the south-—Boko (Sam) clockwise through Kidrenen (Keith)-- which have average exposure rates less than 8pR/hr, and those in the north-—Biken (Leroy) clockwise through Runit (Yvonne)--which average greater than 8 wR/hr. Since the general level of contamination in the southern . . a 1 - \ * comeeee ney y centr em sey mapotoe oRecemmmnn cs wars: ate eye camaenepas grmecen cent ny, doy rapaaman one , oe ce) tos ow tb