4, Cleanup areas will be sampled at some to-be-determined fre- quency during soil removal operations to permit decisions on removing additional soil or certifying the area as cleaned. \ The scraping/sampl- © . : ~ ing will be repeated iteratively, presumably reducing the area for wo cleanup with each pass, until an acceptable level has been reached, / The de endpoint to Cleanup at any site will be when plutonium concentration is assuredly below 40 pCi/g according to the gamma spectroscopy counting method employed. Areas that ERDA certifies as clean will subsequently be sown with grass seed. H. RANKING. The Pu suspect areas together encompass an area of approximately 150 acres. This total is probably on the high side, however, as suspect * area bounds were liberally placed. As summarized oC ee —_—— @n Enclosure 1, fearly 4,000 samples are initially programmed for analysis to eltminatethe— suspicions-end define the areas deserving Cleanup. The last column in Enclosure ] summarizes an attempt to estimate the quantity of material which would be excised if the entire 150 acres must be cleaned up. The volumes were calculated by assuming that areas with significant con- tamination at the surface only will require cleanup to a depth of 15 en, and areas which are contaminated to greater depths will be cleaned up to ~~ “ 4 Pr? - a depth approximately at the point where the AEC Survey shows Pu con-~ £i%