= — BL — Si LAGOON A = BENCHMARK —se NICK —53 © = IMP LOCATION x = —5§4 SOIL SAMPLE LOCATION APPROXIMATE HIGH TIDE LINE ,!972 —s5 / —s6 —s? NANCY - ELLE -—4 25m FIGURE 7-33. COASTLINE AND DATA COLLECTION LOCATIONS FOR ISLAND NANCY Using the 241 am IMP data and the estimated ratio, TRU values were calculated based on original data. (See Tech Note 23 for discussion on original versus final data.) To get a 0.25 hectare estimate, the average of four TRU values forming a square was calculated rather than using kriging (see Section 5.1). Nancy met Condition B without any soil removal. Nancy was measured with detector SN:496, immediately before this detector experienced a drop in efficiency. Also, the agreement between the soil sample results and the IMP measurements was not as good as for other islands, therefore seven more locations were soil sampled in February 1979. Five of the seven were previously sampled and the remaining two were new sites. The results from this additional sampling indicated greater variability in the soil samples and the IMP values were within the range of soil sample results. The conclusion was drawn that the original IMP data from Nancy werevalid. Figure 7-34 shows isopleths on surface TRU activity based on final data. Table 7-4 summarizes the island averages for computed TRU, !3%Cs and §%Co data from IMP measurements. 242