BL EL E44 E6 £8 EO El = w2 SANDB4SR BUILDUP SINCE I972 LAGOON APPROXIMATE HIGH TIDE LINE 1972 DAISY - LOUJ — 50m FIGURE 7-22. ISOPLETHS ON FINAL ESTIMATED SURFACE TRU ACTIVITY IN pCi/g FOR ISLAND DAISY 1972 Survey Results Soil samples were taken at eight locations on Edna during the 1972 survey; two of these were profile samples to 35 em and the others were 0-15 cm core samples. One area of vegetation was also sampled. The results for 0-15 em data for 137g, 90sr and 289,240pu are summarized in Tables 7-1, 7-2, and 7-3, respectively. For all four isotopes, the activity was relatively homogeneous, both across the surface of the island and with depth. This is probably a result of mixing and dilution from wave and wind effects on Edna, which is frequently completely under water during tropical storms, Surface Characterization and Fission Product Sampling Edna is too small for IMP measurements to have been useful, so only soil samples were taken during the cleanup. Fifteen locations were sampled, with four composites at twelve locations and two composites at the other three. Only surface samples were taken, so there were a total of 54 samples. (This was a modification of the usual procedure deseribed in Section 4.2.1.) No ratio of TRU to 241 Am was estimated because there were no IMP data. Tech Notes 2.19 and 2.19A describe the results of the soil sampling, which are also shown in Figure 7-23, along with the sampling locations. The maximum TRU activity in any soil sample was less than 40 pCi/g, so no soil removal was required on Edna. Table 7-5 summarizes the soil sample results of the TRU activity. 229