- 20 0.004 to 0.31. Even ifthe total quantity of plutonium in this sample were concentrated in the top 1 cm of soil (a most unlikely situation), the concentration would be 1.5 pCi/gm, quite comparable to the Colorado guidelines. The recommendations for Enewetak are based upon reasonable constraints to the living patterns and the diet of the people after their return. Colorado criteria did not consider such factors, Furthermore, the Colorado values are not based upon any demonstrated health hazard to man, but rather are based upon an arbitrary factor times the plutonium concentration in Colorado soils resulting from world-wide fallout. Page 12, Lines 4-6 - "It is noteworthy that the AEC has not established that this standard is unduly conservative..." Comment: ERDA (AEC) has never recognized the interim plutonium concentration in soil guidelines of the State of Colorado, nor are we aware that any other Federal agency has recognized this guideline; such guidance is not applicable to Federal property. However, we do not dispute the right of the sovreign State of Colorado to establish whatever guidelines it wishes for applicability elsewhere within the state. The lack of any challenge on this issue should not be interpreted as tacit acceptance of the guidelines, however. Page 12, lines6-10 - ",.,it is not apparent that the AEC has requested the ICRP or NCRP to make specific recommendations with respect to standards for Pu in soils applicable to chronic exposure to the general public, including children," Comments: Contrary to the impressions of Dr. Martell, the ICRP and the NCRP consistently have avoided giving guidance with respect to plutonium contaminated soil. Whether or not this response may change in the future is a matter for speculation. To date, however, no guidance has been forthcoming.