locations. On the northern half of the island, samples taken at one location are not necessarily representative of any other location within that area at any proximity. With such conditions, survey efforts short of actual cleanup of the northern half are probably academic exercises. A statistical approach to such conditions would appear meaningless for a cleanup estimate. This portion of the island would require treatment “with objective sampling techniques vo provide any meaningful evaluation. The southern portion of the island, from Hardtack Station 1310, south, also has unknowns and an SGZ near the airstrip. Most of the area, however, was subjected to nearby fallout and could be approached by a statistically meaningful evaluation. Island. An attempt was made to evaluate the conditions on YVONNE The island was divided into two groups: the northern half which would be sampled objectively, to some depth, 120 to 180 cm (4 to 6 ft.), and the southern half which would be sampled statistically in some attempt to produce data useful for cleanup estimates. The northern end of YVONNE would be sampled to determine the extent of known serious contamination situations. for unknown deposits. No attempt would be made to search Those areas suspected of having buried debris would be investigated, but in no great detail. This area can be evaluated to detail only by actually cleaning it up. The southern portion of the island was approached as if it were a Phase III island. 1. The number of samples was chosen to allow for the following: Stratification of the island into four distinct and arbitrary groups (of equal sample numbers) for surface concentration values (0-5 or 0-15 cm). 2. Detection of contaminated soil areas as small as 10-15% of the southern half-island's area to a depth of 180 cm (6 ft.). 3. Determination of rough volumes of soil.