IIl. TRANSURANICS* IN SURFACE** SOIL Postcleanup surface soil concentrations were determined by the in situ detection method, supported by radiochemical ratio determination. Based upon 1/4 hectare averaging, more than 99 percent of the island is below the 40 pCi/gm residence island criterion. The two 1/4-hectare areas which exceed the standard are below 42 pCi/gm. The island average is determined to be 7.5 pCi/gm. It is therefore concluded that the transuranics classification of Aomon should be Residence. IV. TRANSURANICS IN SUBSURFACE SOTL Based upon a study of the history of test operations, upon soil profile data reported in NVO-140, and upon the results of the Fission Product Data Base Program, a gridded subsurface sampling plan was implemented to delineate the boundary of each area exceeding 160 pCi/gm. Areas exceeding 1/16 hectare were excised and resampled to confirm successful removal. SPECIAL CONSIDERATIONS High transuranic concentrations are known to exist on the north tip of this island along the high tide line near the Kickapoo ground zero. The highest value recorded for any assay area following cleanup is 110 pCi/gm. The remaining activity is fixed to the coral surface. A diligent effort was made to remove the activity, including sweeping and washing with high-pressure water. In addition, small pieces of contaminated metal debris remain along the beach. Debris from the Kickapoo tower was deposited over the reef and has been consolidated in the beach rock. Metal fragments have been removed periodically throughout the cleanup; however, it is likely metal debris will continue to be washed ashore. *For the purpose of this certification, the term "transuranics" is defined as those radionuclides measured and calculated by the ERSP to guide the Enewetak cleanup, i.e., 238 py, 239py, 240py, and 4tlan. **Surface, in this context, refers to the layer of soil observed by the in situ detector in its normal measuring position. It is generally taken as approximately 3 cm in depth. FIGURE 7-113, CERTIFICATION FOR ISLAND SALLY (Continued) 348