There was some minor concern for the islands of FRED and ELMER, for these were the base camp islands and had decontamination pads used for aircraft and/or equipment. These pads were clearly marked on the drawings and would be treated differently from the rest of the Phase I effort. The islands of Phase I were stratified into three groups as follows: - PHASE I = GROUP I BRUCE (ANIYAANIT) IRWIN (POKON) REX (JIERORU) JAMES (RIBAION) GLENN (ICURIN) KEITH HENRY (MUI) LEROY (RIGILI) (GIRINIEN) PHASE I - GROUP IT DAVID (JAPTAN) ELMER (PARRY) FRED (ENIWETOK) PHASE I - GROUP III SAM TOM URIAH WALT VAN ALVIN CLYDE The islands of Phase I, Group. I would be treated as a group, not individually. Considering their cleanliness, inaccessibility due to terrain and vegetation, and approach (all beaches on most were on windward side with dangerous surf), sample collection would be difficult at best and this should be minimized. The expected mean concentration value (hereafter called the mean or mean value) of 239 py activity in the soil was relatively small, less than 1 pCi/g dry soil. stratification. These similar islands were treated as a single As such, the number of surface samples, locations, 116 total, would allow for the determination of the mean (with a precision of