personnel. Two people will operate the Whaler and three will sample f from the LCU. The sampling program will proceed from less contaminated areas of the lagoon to the more highly contaminated areas in order to lessen the probability of sample contamination, Aquatic Survey Goals and Methods Purpose: To define the activity levels in the lagoon and reef environment in order to assess levels of external exposure and the degree of areal con- tamination, Method Objective To assess surface exposure over the reef. Personnel operating from rafts o. will be assayed. meters. B. Immersion dose in off-shore beaches. Analysis of water and sediment samples and in-situ detection methods using the Boston Whaler, Cc. Definition of activity levels in the lagoon and major outflow areas over the reefs, AE! Sila do Sb tesa OTe A. 1. Assessment of sediment concentration Using the Whaler and LCU, sedime A) B) C) D) material, and bottom water wilt collected and analyzed, An in-s detector will be used to define relative activity levels of the bottom. <A detailed bottom surve using an in-situ NaI detector wi be conducted off Runit, followed extensive sediment sampling. levels. , cores, grab samples, suspended shore to 10 fm terrace in lagoon. terrace to deep basin of lagoon. deep basin. craters. 6 ene ¥ ath | Rste't tlt . - on foot utilizing B-y survey “Only reef covered w/less than 3 feet of water _ NO coral and-algae. The percent of each type of bottom material-.depends on location, although, in general, a higher percentage of fine material is found closer to waren shore where a corer may be used. ow, aa In the deeper area of the lagoon higher percentages of formanifer and nolimeda debris dominate. I ‘these areas dredging and grab sampling will be more successful . RGRERE. nes -" “aterte mre The device used to obtain a bott sample in any area will depend entirely on the composition of t sediment. The sediment in the lagoon varies from fine sand to ~23-