Supplement - Page 3. Note: These computations assume the data are homogeneous, i.e. there are no trends in the data. Since there are trends present on Janet (increasing concentrations near GZ areas) these kinds of computations should be done separately for GZ and low level areas. Ill. One-Sided Confidence Limit on a Proportion Using "Attribute Sampling" by Herman Burstein, Mc-Graw-Hill, 1971, (Table 1) we can obtain the following probability statement: The probability is 100(1-a) that the proportion of soil samples with Pu concentrations greater than or equal to the cleanup Level L is less than or equal to P. Estimates of P for various values of a for cleanup level 40pCi/g (using the 139 soil samples (0-15 cm) from Janet) are: a 0} . 167 .10 . 133 .05 Interpretation: P 145 Note: Proportion of samples with Pu concentrations 2 40 pCi/g is 13/139 = .0935. For a = .01; We are 99% sure that 16.7% of the soil samples on Janet have concentrations 2 40pCi/g. Discussion: A possible approach to deciding whether an island needs to be cleaned up is as follows: The island (or parts of the island) will be cleaned up unless P is Tess than, say, 5% for some specified a level, say .01. If it had happened that only 1 of the 139 samples had a Pu concentration 2 40pCi/g then we find that P = .047 (4.7%) for a = .01. Hence, in that hypothetical case we would decide not to cleanup the island if the above rule (P <.05 when a = .01) had been used. An alternative and perhaps preferable method of deciding whether cleanup is necessary is discussed under Question 3, part B.