quia Four samples of lagoon-bottom silt from the northeast corner of Rongelap Atoll gave beta activity values ranging from 8,000 to 12,000 B-/min/g. Activity was uniformly distributed to a depth of 6 to 7 in. Lagoon depths were 40, 55, 60, and 120 ft. The data in Table 2.6 indicate a considerable reservoir of activity available for contaminating marine food species. Data presented in Chapter 4 confirm that this activity contaminates the food supply. 2.2.5 Water Water samples were collected from cisterns, wells, tree boles, barrels, exposed soil profiles, and ocean and lagoon sides of the islands. The ocean and lagoon water samples were collected within 10 ft of the water line to evaluate the movement of activity from the islands into the surrounding waters. Exposed profiles and well water samples were selected to describe any movement of activity into the fresh water lens and the remainder of the samples were collected to evaluate the hazard from drinking the water. Gross beta activities of the above samples are presented in Table 2.7. The scarcity of potable water is demonstrated by the few islands from which cistern water was obtainable. TABLE 2.7 Summary of Gross Beta Activity in Water Beta Activity (3°/min/liter) Sources of Water Ocean Island Cistern nee aa Likiep nDaA‘4) NDA Busch 36 NDA Uurik Rongelap 50 80 290 6,300 260 23,000 460 Labaredj Ka belle 7,700 2,300 56 60 Lomuilal 380 170 Eniwetak (a) 37 100 12 NDA 330 Eniaetok Bikar Top Bottom 1,350 16,000 Well Barrel Tree Bole ee NDA 28 430 44,000 14,000 ° 8,100 15,000 28 DOE ARCHIVES 170 No detectable activity -ll- 20 Zo: