the two samples and end of taken at the beginning quantities of fresh water that recharge the groundwater reservoirs the continuous pumping experiment exceed the USPHS limit of around the perimeter. 1Q pCif/litre. possible that exploration of the area The USPHS recommends It is quite between FWR 4 and FWR 1 and the area that when the concentration of 10 pCi/l is exceeded, a water supply shall be approved by south of FWR 4 along the runway perimeter both to the east and west will the certifying authority if surveillance of total intake of radioactivity from all sources uncover quantities of usable groundwater. indicates that such intakes are within the limits recom- in a northerly direction from FWR 1, the water tends brackish mended by the Federal Radiation to be more (see FWR 2? data in Table 4). The only hope of uncovering drink- Council for control action. 10 Therefore before this water is recom- able groundwater mended as usable, area would be to chance upon a a complete dose assessment of all pathways must first be completed. perched tens. Also, because the conBIKINI centrations in the water may either increase or decrease with must be remembered of time, Let Jevels are critical to if the Wotae the water RADIONUCLIDES 905. nd 239,240), in the > groundwater from the newly estab- total dose, the radionuclides in lished wells on Bikini were before any realistic Long-term dose Pu The concen- concentrations groundwater at site depend on the soil burdens, respective levels at the rates leaching and groundwater recharge, the groundwater residence time, and other physical, chemi- cal biological, and (HFH 7) were higher well 90 (FPWR 4), Sr HFH in in 7 the is than the the old Eneu the concentration of soluble lower the the old Bikini well trations in the groundwater will of much higher than those at Eneu. Inter7 estingly, although the Cs and 239,240 Lhe groundwater must be understood prediction can be made. ISLAND: The average concentrations of QO 94 . that regardless the total assessment, the dynamics of in the northern than fraction the from level at FWR 4 on Eneu by a factor of 3. factors. The freshness of the water at IWR 4 apparently relates graphy of the area. to Except the pgeo- Water for UFH 7, the concentrations Oc, groundat The runway pro- Bikini locations bably acts as a large catchment sys-~- Public Health tem for rainfall, limit of 10 pCi/litre. draining large ~1 5- the exceeded Service other the U.S. recommended