1972 Survey Results Soil samples were taken at 23 locations on Alice during the 1972 survey. At four locations, 0-35 em profiles were taken, a 0-65 em profile was taken at one location, and 0-15 em core samples were taken at the other 18 locations. A few vegetation samples werealso taken on Alice. At two of the 0-35 em profile locations, the activity of 239,240py either rose with depth or remained constant. One of these was on the ocean-side beach, and the other was in the northeast area where the soil was graded during test operations. At the other profile locations, 239,240 py activity fell with depth. The depth distribution of 30sr and 137s generally followed the same attern as »240py. Tables 7-1, 7-2 and 7-3 summarize the results for 0-15 em data for 137Cs, Osp and 239,240 py, respectively. Surface Characterization Alice was initially measured with the IMP on a 50 m grid in early February 1978, at the locations shown in Figure 7-2. Detector SN:496 was used to make the measurements, and it was inadvertently operated at an incorrect bias voltage. Soil samples to determine the ratio of TRU to 24lam were taken 21 February 1978 at five locations, with two composites at each of three depths for a total of 30 samples. (See Section 4.2.1 for details on the procedure.) These samples were used to estimate the ratio of TRU to 24lam to be 3.2 + 0.09 (see Tech Note 2.7). Although the values for 2414m determined from soil samples are rarely the same at a given location as the 2414m measured by the IMP, the discrepancy in the Alice data was unusually large. The problem was traced to the incorrect operating voltage on the detector, which had affected measurements on several islands. A correction factor of 1.6 + 0.24 was determined by remeasuring several locations on Sally at the correct voltage, and the data values measured at the incorrect vos were multiplied by this factor. (Tech Note 5.0 contains details on the determination of this value. Even with the correction factor, Alice IMP data still showed a large discrepancy from the soil data, so additional measurements and soil samples were taken in April 1978. Seven locations, one of which had been sampled in February, were soil sampled, taking four composites instead of the usual two. The ratio of TRU to 241am determined from these samples was the same as the ratio previously determined. N2—- a.— s2— $4— “APPROXIMATE HIGH TIDE LINE, 1972 se—— LAGOON 4 = BENCHMARK PIERRE O-= Imp Lo CATION X =SOIL SAMPLE LOCATION ALICE ~ BOKOLUO NO CODE INITIAL SAMPLING LOCATIONS - FEB 7 A LOCATIONS SAMPLED APR ‘76 . . | 8 LOCATIONS SAMPLED FES AND APR ‘78 50m FIGURE 7-2. COASTLINE AND DATA COLLECTION LOCATIONS FOR ISLAND ALICE 212