Anticipated Analyses of New Data Since January 1, 1975, additional data from the safety-shot sites have been reported by the analytical laboratories. This includes analyses 239-2405, | 241, 2345 2354 2365 238 for , and > U for soil and/or vegetation samples taken from A site of Area 11. While incomplete, these data will be used to obtain preliminary estimates of inventory for 239-240, 235y 238 ’ , and U in the surface soil of A site. Results for four profile samples have also been reported for this site. 2385, 239-240, Additional soil and vegetation analyses for , and 241 Am have also been reported for the TTR sites. ble, Whenever possi- these will be used to update the estimates of inventory reported for these sites in Gilbert et az. (1975). Attempts to estimate 239-240Pu concentration contours using the SURFACE II computer program will also be made using the new TTR data in combination with that previously available. Hopefully, less biased estimates can be obtained than reported by Gilbert e¢ al. (1975) for Area 13 and GMX. Also, the data from these latter two sites will be reexamined with the same goal in mind. ESTIMATION OF RATIOS The methods used up to the present time to estimate (1) 241 an ratios in soil and vegetation and 239-240 Pu to (2) vegetation to soil ratios of 239-2405, concentrations for paired vegetation-soil samples are given in Gilbert et az. (1975) and Rommey et az. the estimated ratios themselves. Gilbert et al. estimated ratio A - 2, = > Y, x X, Pim Yi? was preferable to the average of the ratios 107 (1975), along with concluded that the