Mr. Tom McCraw September 22, 1976 Page 8. The question of a generalized approach should also be taken-up -with Dr. Delfiner. The general level and heterogeneity of plutonium activity in soil over an island will certainly affect the total number of samples required for cleanup (if any) and certification. However, the general sampling design may be applicable to all islands. I hope this letter will help you in planning for the Enewetak sampling and cleanup effort. Some of the ideas discussed here are in pretty rough form and would need considerable thought to develop a final plan. Hopefully my brief comments on "acceptance safipling" will serve to stimulate discussion on its merits relative to the "average concentration" approach for deciding whether cleanup is required or has been achieved. Best regards, Richard 0. Gilbert Senior Research Scientist Systems Department Statistics Section cc: Roger Ray, ERDA, NV, Las Vegas Bruce Church, ERDA, NV, Las Vegas Paul Dunaway, ERDA, NV, Las Vegas Mary White, ERDA, NV, Las Vegas