Table 1. Distribution of soil sample special interest. locations on Bikini and Eneu Islands. placed in plastic bags with identifi- No. of sample locations Surface (0-15 cm) Profiles (0-90 cm) Bikini The samples were cation tags and prepared for shipment to LLL where they were processed and analyzed by gamma spectroscopy. ples were analyzed for 239,240), and 905, by wet chemistry methods at McClellan Laboratory, North of second baseline N 25 2 Central section 200 4 South of second baseline S 25 2 North of airstrip 60 2 South of airstrip 40 2 Sam-— <A complete report on the analytical procedures has been published.» BIKINI GROUND WATER PROGRAM Eneu Total 350 127 A limited number of profile samples were designed to establish a network of well locations on Bikini and Eneu the hydrology and geochemistry of elements in the’ ground water system. several samples were collected The north and south sections of Bikini Island and all of Eneu have lower contamination levels; hence, the sampling density was lower. quality and to study systematically radionuclides and major and trace planned in this area because during previous surveys. The ground water program was Islands to assess the ground water 46 samples each. to live in this section, Purpose Special emphasis, however, was given to the lagoon side of both islands since Water movement and residence times were to be assessed to deduce the transport rates and mechanisms of radionuclides deposited in the soil zone or taken up by vegetation, Methods and Measurements Pits were dug with a backhoe to the. homes may also be erected in these hard coral layer: areas. reservoir. surface was approximately The exact soil-sampling locations the ground water 2m below the ground surface. Seven were determined by a random selection holes were drilled with a ground power process to obtain statistically mean- auger at selected locations along the ingful and unbiased results. centerlines of Bikini and Eneu Islands. Special samples were also collected within The auger penetrated the ground water "hot spot" areas and other areas of lens to a depth of approximately 1 to. 05s