estimated to be 4] pCi/g. An estimated 1375 cubic meters (1800 cubie yards) of soil containing an estimated 0.16 curies of TRU activity were removed from the Hustead area based on final data. Other Activities In February 1978 detector SN:496 was installed on one of the IMPs. This deteetor was mistakenly operated at a bias voltage of -2000 v rather than -3000 v from 3 February to 25 February 1978, To correct the IMP data already collected, remeasurements were taken at nine different locations in the Kickapoo area with the correct bias voltage. Data had already been taken at these locations with the lower voltage. A comparison was made of these results and a correction factor of 1.16 + 0.25 was determined. (See Tech Note 5 series for more information on this experiment and others connected with detector SN:496.) In order to determine total TRU activity removed in the Kickapoo and Yuma areas, a method using truck samples was attempted. Soil samples were taken from each truck loading from the cleanup area and analyzed by gamma spectroscopy to determine the 24lam. after reviewing this method and comparing it to the method which used the IMP results, it appeared that the truck sampling was not a feasible technique for determining curies of TRU removed. (See Tech Note 10.0.) Because the PACE area on Sally was swampy and in poor shape for agriculture, a restoration project was conducted. In order to ascertain that no high TRU concentrations would be exposed during this operation, subsurface soil samples from potential borrow areas were taken in June and August 1978. Figure 7-104 indicates locations sampled and also the areas the fill came from. The results from these samples showed no elevated TRU concentrations in the subsurface but two surface results showed high activity. These areas were then measured by the IMP and showed TRU concentrations of 30-35 pCi/g. Fission Product Sampling In support of the dose assessment (see Section 6.11), a fission products sampling program was conducted on Sally during March 1979 on the 50 m grid already established. Out of the 139 locations sampled, 90g, analysis was done on 39. The following table gives the arithmetic mean for 90sp and 137Cs for certain profile ranges. 90s, pCi/g 137% C6, pCi/g 0-5 em 5.6 4.2 0-40 em 3.0 2.5 0-60 cm 2.9 2.2 Total Samples 232 809 Tables 7-1,, 7-2, and 7-3 give some summary statistics for the 0-15 em depthsforthe 1375, 90sp and estimated 239,240py results respectively, and Figures 7-105 and 7-106 show isopleths for 0-40 cm profile mean data over the entire island for 37Cs and Sr, respectively. Another major project associated with Sally was the Aomon Crypt mentioned previously. (For complete details, see Section 6.8.) Because this crypt was along the causeway, most of the soil and debris was stockpiled on Sally. After the stockpile was hauled away, the area was measured by the IMP to verify that no elevated TRU activity remained. Final Characterization Following recontouring of the PACE area, surface soil samples and IMP measurements were taken in the areas affected. The soil sample results yielded a TRU to 241 Am ratio of 3.2 with all IMP 24lam values less than 2.5 pCi/g; therefore, all TRU activity was less than 8.0 pCi/g. Figure 7-107 shows the isopleths for, the final Sally data and Table 7-5 shows the mean of the IMP results for the calculated TRU, !37Cs and 6Co for this island. The island average transuranics value reported in the Certification is 7.5 pCi/gm for surface soil, and the transuranics classification is Residence. 331