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 cleanup with each pass, until an acceptable level has been reached. The 9 « ya oe tao endpoint to Cleanup at any site will be when plutonium concentration is assuredly below 40 pCi/g according to the gamma spectroscopy counting ATA method loyed. Areas thereERDA certifie certifies @e—chean w ill subsequentl ethod employe ubsequently ohh. be sown with grass seed. rn i TT. pouaul, He RANKING. Oy AAiat DAL | peht . | 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 in Enclosure 1, nearly 4,000 samples are initially programmed for analysis to eliminate the suspicions and define the areas deserving Cleanup. The last column in Enclosure 1 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 contamination at the surface only will require cleanup to a depth of 15 cn, and areas which are contaminated to greater depths will be cleaned up to a depth approximately at the point where the AEC Survey shows Pu con- t t