site, A Site in Area 11 (Plutonium Valley), have since become avail- able and are analyzed in the present report. These data include 239-2405, 241an 2344) 2354 2364 and 238y for soil and/or vegetation. Approximately 50% of the data have still to be reported, but + the available results estimate: (analyzed by LFE Laboratories) (1) average concentrations of 239-2405, are used here to 235y an random soil and associated (adjacent) vegetation samples; concentrations of 2347 | in vegetation samples; d 2381, in (2) average 2365 and total u (734y + 235y + 236y 4 7238p) (3) the inventory of 2354, 2387 and 239-2405, in surface (0-5 cm depth) soil; 2351 + 238 U, (4) the relationship between soil and associated vegetation samples for 2354 and 238), and (5) the change in concentrations of 2355 2385 and 239-240 Pu with depth of soil for four profile samples. The remainder of this report concerns a comparison of plutonium and americium concentrations in different "fractions" of the soil matrix in samples collected from Area 13 and the Tonopah Test Range as part of the inventory sampling program. This information is particularly relevant at the present time since the three analytical laboratories currently performing radiochemical analyses for the NAEG have been sent either ball-mill Hence, (BM) or sieved soil fractions for analysis. the question arises whether the reported results from the three laboratories are really comparable, fractions contain (on the average) concentration? i.e., do the different different levels of plutonium That this might be the case is suggested by Tamura's (1974) work on the distribution of plutonium in different soil fractions. If there are differences in plutonium concentrations in different soil fractions, then changes may be required in soil prepara- tion procedures so that all laboratories receive the same soil fraction for analysis. Information is given here on plutonium and americium concentrations in the following soil fractions: mesh." "ball-mill," "<100 mesh," and ''>100 A BM aliquot is one taken from the sample after the sample has been oven dried at 65° C. for 12 hours (allowing the sample to reach standard dry weight) and then ball-milled for 5 hours in a gallon can with ten l-inch manganese forged steel balls per sample. A "<100 mesh" ("sieved") aliquot is one taken from BM soil that has passed through a 100 mesh sieve (2 or 8 inch). 119 Finally, a ">100