IMP 24lam numbers, Estimates and upper bounds on 0.25 hectare averages were not computed because of insufficient data collected on this small island. All calculated TRU values were less than 10 pCi/g based on original data. (See Tech Note 23 for discussion on original versus final data.) Wilma was measured with a detector that experienced a loss in efficiency causing the calculated 2414 m IMP values to be low. This was discovered after the initial characterization was complete. A correction factor was estimated for this problem and the data corrected for the final characterization. (See Tech Note 5.2 for details on the determination of this correction factor.) Figure 7-48 shows the isopleth on final TRU activity after correction of the IMP data for detector efficiency. Table 7-4 gives island averages for computed TRU, 137g and ®%Co aetivities for the final IMP data. Fission Product Sampling Soil samples were collected on a 50 m grid for the Fission Product Data Base Program in support of the dose assessment(see Section 6.11). Of the 17 locations sampled on Wilma, soil from five of them had 99sr analysis. The 0-15 em data for Cs, r and *3%240py activities are summarized in Tables 7-1, 7-2 and 7-3, respectively. The island average transuranics value reported in the Certification is 3 pCi/gmfor surface soil, and the transuranics classification is Residence. 0 2 | | 4 6 | 8 | o> ~ NiO — N Na— ‘ } f N6 — LAGOON n4— j a N2e— APPROXIMATE HIGH TIDE LINE, I972 BL — OCEAN $2— $4 — WILMA - BILLAE a -——~+4 . 5SOm FIGURE 7-48. ISOPLETHS ON FINAL ESTIMATED SURFACE TRU ACTIVITYIN pCi/g FOR ISLAND WILMA 259