Mr. Church stated that the available possible subterranean pockets. data was not extensive enough to support a contention that other pockets did not exist. For purposes of certification there would have to be additional data taken. The same method of obtaining data for certification applies to all islands. This consists of in-situ and surface soil sample surveys, and investigation of suspected burial sites, supplemented by selected soil profiling data. Obviously, the greater the density of soil sampling profile data, the lower the chance of being surprised later in the cleanup. - 4 a. After extensive discussion, the following was proposed and accepted. The norther half of the island will be gridded on a 50 meter grid. The "cool" area will be sampled first in order to characterize the areas to be used for stockpiling of soil and debris from other islands. Approximately 16 to 50 sample sites will be required, depending on initial findings. Areas are to be decided based on stockpile locations. Sampling transects should be cut through the mounds in this area to characterize the contents thereof. Characterization of the extent of subsurface pockets can use an adaptation of the one half distance technique, working along the 50 meter grid lines. Density of other sampling in the "hot" areas can be decided on basis of data obtained from the "pocket" investigation. b. Use of the standard 50 meter grid will permit use of data obtained during characterization for consideration for certification. Although Runit will be no different in method for certification, the history of the island and available data do indicate a probable requirement for higher density survey than may be required for other islands. This led to a discussion of the advantages and disadvantages of placing contaminated stockpiles on relatively uncontaminated areas. It would generally be better to put contaminated stockpiles in areas known to be contaminated to similar or higher levels. The "cool" area requires relatively few sampling sites and to place the contaminated stockpile in the "hot" area may interfere with the characterization effort. 15. It was agreed that when resources permit it would be highly desirable to use one IMP to further refine the area of surface contamination to be removed, These areas are defined, in the Fig/Quince area, by aerial survey contours. The Cactus crater area is not defined. In-situ survey refine- ment would assist considerably in refining the estimates of area, and thus volume, to be excised. Mr. Church proposed to use the IMP only to move in toward "hot" areas and define the periphery of those areas over 400 pCi/g. This would not be a full survey but would refine the area boundries and would avoid risk of high contamination of the IMP. There was discussion of use of this "peripheral" technique as compared to a full survey. Nee It was agreed that the peripheral technique would not totally ~ oc 4# here mee weet wore eee