- 19 direction by the basic FRC standards considered as an upper limit to what might be acceptable (this is a health consideration), and in the other direction by a rapidly increasing engineering effort that is required for even small increments of exposure reduction below the standards (this is a cost consideration). It would not take much excess conservatism in cleanup "monitoring" or changes in the Task Group numerical guides to upset the agreement on standards and/aclicately balanced position on cleanup guidance that has been achieved among the Federal agencies. The health risk associated with exposures at the level of the FRC standards is known to be very low and considered acceptable for the general public, but this risk may not be zero. No guarantee can be given that those who return to Enewetak will experience zero ill effects from radiation received. However, we do not expect to see any such effects, Nevertheless, if the wording is examined carefully, the comparison is made between the recommended cleanup criteria and the Colorado "interim standards" in land areas for residential use. It should be noted that Case 3, the recommended cleanup plan, would limit the residence locations of the Enewetakese to the southern islands of the Atoll, at least initially. According to Table 3-8, p. 3-70, Vol. I of the DEIS, the mean plutonium concentration in soil on most of these southern islands varies from 0.04 to 0.07 pCi/gm (ranging from 0.004 to 1.1 pCi/gm), with one island showing a mean concentration of 0.63 pCi/gm (range 0.2-2.0), all of which are below the interim guideline established by the State of Colorado and referred to by Dr. Martell. While these are mean values over 15 cm of soil depth, the islands consisting of the initial islands of habitation show a mean value of 0.04 with a range of RRRERPELE a IRT ete oe OE dae oe