7. -_ wot respect to the «.pected depth at which soil is considered contaminated. Soil samples will be taken continuously during these operations to monitor the success of reducing the amount of contamination remaining. These samples will weigh about 100 g but will not have a precise configuration; they will be conveniently scooped from the work site. The locations from which the samples are collected will only be approximately identified— surveyors will not be required... wo tee ewe we Te em we ee te 7. A trailer-contained Field Radiglovical Lahoratory will be stationed at each work site to expedite analysis of samples collected during the soil removal operations. The Field Radiological Laboratory _will contain sample storage facilities, muffle furnaces, alpha scintillation “te ie” het . counters, and necessary power supplies to operate laboratory equipment ’ as well as the exterior air samplers operating at the site (See Part V.H on air sampling). Samples will be prepared for alpha counting by baking them in a muffle furnace, and by uniformly spreading the dried powder which is formed into a flat counting container whose surface area is ~~ about the same as the alpha counter probe. (Reference 7 uses a 100 cm diameter petri dish and smooths the soil surface by means of a tongue _ depressor.) As the data from these samples will.influence the amount of digging, it is essential that very prompt analyses are performed; thus, the Field Radiological Laboratory will have sufficient capability so that soil assays do not delay soil removal. Since the alpha counting method used will only measure Pu near the sample surface, i.e., PU sources no deeper than about 50 microns beneath the surface, a i number of the samples willbe sent to the Radiological Laboratory for. repeat analysis. The remaining samples will be retained until after the island from which het they are obtained btained i is certified tified to to b e“Gleaity jie island poet 8. When a site appears to be Eleaned)to an acceptable Pu _con_ centration levelbased on_alpha_ conuting, it will be graded level and sampled bymeans of the 5-cm deep “cookie cutter." The samples will be randomly taken from precise locations at_a_frequency acceptableto_the on-site ERDA Representative, and analyzed by radiochemical methodsin the Radiological Laboratory. If these samples show Pu concentrations mot exceeding 40 pCi/g, then the ERDA Representative will certif wee site as "@lean") if there are concentrations greater than 40pCi/g, the site will be cleaned as necessary. . 9. Cg ee at eee The suspected soil burial sites (Enclosure 2) will be sampled by means of a truck-mounted auger capable of drilling into ground “the depths up to 10 ft. Material will be removed from the auger as it penetrates thegroundandassayed in a Field Radiological Laboratory. If the presence of a burial site is confirmed, it will be excised and verifTed as by the same methods used . for cleanup of surface sites.” nn . eS . Tok “ ‘ zc ee werow VE Sige Pile loot Troost: . . tas roms, Smet te (2S AMS es oe PICe BR GAS avi dun . . . . Minaiet wtadivar- 2 wease. we ae m8 som. ¢ 11 . . woot ae wonie Tod wa: “na . Ce ek Ba Th oe me beet weep ” ~ fa mas : rod, e . * me eRew Re . he 7 we aeat, a