+ DRAFT appropriate identification tags and readied for shipment to LLL they underwent preprocessing and gamma-spectral analysis. where Plutonium-239, 240 and strontium-90 analyses, were performed by wet chemistry methods at McClellan Laboratory. A complete report on the analytical procedures has been published (3). | Bikini Ground Water Program Purpose: The ground water program was designed to establish a network of well locations on Bikini and Eneu Islands in order to assess the ground water quality and to systematically study the hydrology and geochemistry of radionuclides, major and trace elements in the ground water system. _ 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 Seven holes were drilled with a ground power auger at selected locations along the centerlines of Bikini and Eneu Islands. Pits were dug with a backhoe to a maximum depth since the ground water reservoir surface was approximately 2 meters below the ground surface. The auger penetrated the ground water lens to a depth of approximately 3 to 5 feet. Each hole was cased with slotted 2" diameter PVC pipe which was extended to the soil ‘surface. The pits were backfilled to minimize environmental impact on the area. The first hole was located near the island center. The salinity of the water was measured with an in-situ conductivity probe. Two holes were then drilled to bracket the center hole and the salinity measured in each. 9009881