used will consist of a pair of 4" x k" NaI detectors and two single channel analyzers. A few selected samples will also be screened with a Ge(Li) system in order to determine their radionuclide content. The Data Evaluations Group will be in charge of co-ordinating collection of data and samples, sample coding, preparation, counting, and other activities in this onsite laboratory. V. ENIWETOK AQUATIC PROGRAM The mission of the aquatic survey will be to define the contri- buting radioactivities in the lagoon and reef areas of the atoll to assess exposure pathways to individuals utilizing the aquatic environment. Sources and levels of activity in the lagoon and reef will be defined using indicator organisms, in-situ detectors, sediment, and water analyses, Samples of edible marine vertebrates and invertebrates will be collected and analyzed for specific radionvelides, Many species will be collected from the reef and lagoon areas that were surveyed in 1964, Changes in activities levels noted over the 8 year period will be assessed. Several methods of assessing the residence time of specific radionuclides in the lagoon environment will be employed. The types and quantities of samples required will be discussed in the next sections. The entire program, covering both survey and food chain sampling, will be integrated in order to best use our available sampling facilities, Program Implementation The development of the aquatic program in the Eniwetok lagoon was originally designed to take advantage of facilities offered by the research vessel, R. V. Palumbo from the Puerto Rico Nuclear Center. The Palumbo left Puerto Rico on August 20 enroute to San Diego, Hawaii, Kwajalein, Bikini and Eniwetok. The mission of the vessel is in support of a DBER funded program involving individuals from the University of Washington, Lawrence Livermore Laboratory and Puerto Rico Nuclear Center investigating the biogeochemical behavior of the transuranium elements in a labelled marine environment. Due to mechanical failures and other operational problems, the Palumbo has been in the San Diego Naval shipyard since September 9 undergoing extensive repairs. 28 September. The vessel left San Diego on If no further delays are encountered enroute, the Palumbo's present schedule would delay its arrival time in Eniwetok by 16 days. 21- The