Method Objective 2, Surface-to-bottom profiles will be Water concentration obtained by pumping 55 L water samples. Samples will be obtained from 18 stations in the lagoon and 18 staticns over the reef. Both the Whaler and LCU will be utilized, 50 - 5 gal bottom water samples and suspended sediment will be obtained in the Runit area, 3. Additional supplementary data required to assess relative concentration levels in the Lagoon. Miscellaneous A variety of indicator organisms will be obtained by dredging the sediment and coral knolls in the lagoon from the LCU and Whaler. Daily plankton collections and invertebrates will complement this effort. Species of algae will be obtained from reef areas for analysis. activities The desalination plant will be studied, with emphasis on the fate of the sludge discharged from the plant, Samples to meet survey requirements Water 48-55 L water samples from the open lagoon and reef 50-5 gal bottom samples from the Runit area and craters. Sediment 100 core samples 2" and 3" diameter 200 grab samples 100 dredge samples 50 suspended sediment samples 50 Runit cores Biota 1) 200 plankton samples petailed vertical profiles of radio- nuclide concentrations in 20 selected cores will be determined. All other camples will be rapidly scanned for relative activity levels and selecte samples Quantitatively analyzed. Activity levels in vertical sections of Runit cores will be determined in about 50 samples. If similar areas are sampled, many individual tows will be combined for analysis, especially if the plankton yielca is low. All samples will be rapidly scanned in the field and a selected number quantitatively analyze: on-contiinent. 2) Invertebrates, including sponges Specimens will be collected from all accessable reef areas, ~O4e 409-500