were considered. The fit to these 31 data pairs is shown in Fig. 11. As in Fig. 9, the two lines are not parallel nor coincident, although By is slightly nearer 0 and 8, slightly nearer 1. Statistically speaking, however, the null hypothesis that 8) = OQ and 8, = 1 Hence, the inclusion of profile samples with was still rejected. low-level Pu concentrations does not appear to materially affect the regression relationship between the logs of Pu concentrations in BM and sieved soil fractions. The comparison between BM and sieved results in Figs. 9 and 10 is complicated by the fact that one laboratory analyzed the BM aliquots and another the sieved aliquots. That is, part of the differences between BM and sieved results may be due to differences between laboratories. Table 6 gives 239-2405, concentrations on BM and sieved aliquots of surface soil samples from stratum 2 of Area 13, all of which were analyzed by LASL. In Table 7, plutonium concentra- tions are given for BM and sieved aliquots from the 10 levels of a single profile sample in stratum 3 of Area 13, all of which were analyzed by LFE. The logs of these data are plotted in Figs. 12 and 13, and linear fits made to the data. on surface samples in Fig. 12, Concerning the LASL data the Pu concentrations in sieved samples are consistently higher than in BM fraction aliquots, and Bq: 8, are significantly different from zero and 1, respectively, so that the two lines in Fig. 12 are neither parallel nor coincident. range of concentrations in Fig. Fig. 12 is about the same as that in 11 where this same conclusion was reached. 2385, for these aliquots. The LASL also reported These data are not given here, but a plot of the data and the fitted line look almost identical to that for 239-2405. in Fig. 12 with identical conclusions. Table 7 (plotted in Fig. The LFE data from 13) exhibit considerable scatter since 8 of the 10 samples are at depths greater than 5 cm with resulting low Pu concentrations in both BM and sieved soil fractions. Note that the scatter below log concentrations of -2.0 for both BM and sieved aliquots is about the same in Fig. fitted line in Fig. 13 as it is in Fig. 9. The 13 suggests that sieved aliquots tend to yield Pu concentrations greater than obtained on BM aliquots. However, there are no statistically significant differences between the fitted 142