4, PU SURVEY CRITERIA: The AEC Task Group recommendations and guidance were by design, general in nature. a. Subsequently, criteria have been developed by ERDA to guide the in situ soil assay. A case-by-case evaluation by the CJTG (with the advice of the RCC) of the requirements b. for soil removal, taking into consideration the location (island), planned use, economics and the AEC/ERDA Task Group recommendations, will be required for each of the islands where contamination is found to exist. The resulting evaluation should lead to one of the four following conditions which have been recommended by ERDA. (1) When an assay areal! is determined bv either direct measurem ent or Condition A. extrapolation, to exceed 400 pCi/g (at the 67 percent confidence tevel/2), the following actions will be taken: The area will be fine surveyed and isopieths drawn which define the region which (a) exceeds local background/3, (b) Vertical soil profiles will be taken to evaluate the effectiveness of excavation as a means of reducing the resuspension potential/4, (ec) An iterative excavation plan will be executed to: 1. Reduce the assay area average concentration below 400 pCi/L. 2. Reduce the average concentration of the “defined region" to some lower number which shall be determined by cost-benefit considerations but will usually not be below local background. (d) The region will be resurveyed and the results documented. (2) Condition B. When a half heetare is determined by either direct measurement or extrapolation to exceed 100 pCi/g (at the 67 percent confidence level), the following actions will be (a) The area will be fine surveyed and isopleths drawn which define the region which (b) Vertical soil profiles will be taken to evaluate the effectiveness of excavation as a (c) An iterative excavation plan will be executed to: exceeds local background. means of reducing the Resuspension Potential. 1. Reduce the half hectare area average concentration below 100 pCi/g. 2. Reduce the average concentration of the “defined region" to some lower number which shall be determined by cost-benefit considerations but will usually not be below local background. (d) (3) The region will be resurveyed and the results documented. Condition C: When a quarter hectare is determined by either direct measurement or extrapolation to exceed 40 pCi/g (at the 67 percent confidence level number), the following actions will be taken: (a) The area will be fine surveyed and isopleths drawn which define the region which exceeds local background. (b) Vertical soil profiles will be taken to evaluate the effectiveness of excavation as a means of reducing the Resuspension Potential. *See Section 2.2.4 of this Report for final criteria. E-1] al taken: