1972 Survey Results During the 1972 survey, the soil was sampled at 13 sites on Clara, and a few vegetation sampies were taken. Nine of the sites had 0-15 em core samples, three had 0-35 cm profiles, and one had a 0-55 em profile. As shown by Table 7-3, the overall surface 239,240 py activity was far enough below the Condition C criteria to warrant the assumption that no area would require more intensive sampling than any other. In general, the activity of 299240py declined steeply, with depth, indicating that no elevated subsurface activity would be expected. Activity of !37Cs and 905, also declined with depth, though much moreslowly than did 239,240py activity. Tables 7-1 and 7-2 summarize the 137Cs and Osr results, respectively, for the 0-15 em samples. Surface - Characterization Clara was surveyed with the IMP on a 25 m grid, 13-15 February, 1978. A total of 24 locations were sampled, as shown in Figure 7-16. Soil samples for computing a ratio of TRU to 241 am were taken on 22 February, 1978 at four locations, also shown in Figure 7-16. Each location was sampled at three depths, so that the estimated ratio of 4.23 + 0.30 was based on a total of 24 samples. aL—— Ssi—— $s2-—— $3— OCEAN APPROXIMATE HIGH TIDE, I972 BENCHMARK BUTCH LAGOON © = IMP LOCATION xX = SOIL SAMPLE LOCATION CLARA - KIRUNU ‘ese FIGURE 7-16. COASTLINE AND DATA COLLECTION LOCATIONS FOR ISLAND CLARA 223