subject of much investigation. In the cases of normal fallout and subsequent leaching and other vertical movement mechanisms, the concentrations of the various radionuclides with depth is expected to approximate an exponential or log normal distribution. From the limited number of soil profiles obtained during previous survey efforts, this distribution seemed to hold for undisturbed soils. Of course, it did not hold where the soil had been disturbed cy mechanical mixing. . Recognizing the types of soil, the vertical distribution of radionuclides expected to be encountered, and the range of typical fission product gamma rays, the collection process was designed to sample in three different ways. Two surface samples were taken, a shallow and a deep core. Where vertical distribution information was required, a side wall sample profile was obtained to depth from a trench, The soil sampling tools are illustrated in Figures 11, 12 and 13. 57