investigation of the radiological con- Drilled on 7/15/74 to a depth of 10 m ditions, both from the standpoint of and cased to total depth. present distributions as well as - 2.0 m AMSL. Elevation future clean-up efforts, three wells were drilled for groundwater studies XRU-1 and five EXPOE wells were set with Located about 65 m due east fror slotted casing and made available for the center of Cactus crater. sampling. from 3/6/74 to 3/14/74 to a depth of The wells are concentrated Drilled in the sparsely vegetated area im- 53 m and cased to total depth. mediately south of Cactus crater, Elevation - 3.05 m AMSL(S). but one well was drilled about onethird the length of the island from XRU-2a Cactus near a suspected Pu burial Located about 115 m from the center site. of Cactus crater along a line running east of southeast. ARU-1 Drilled from 3/8/74 to 3/14/74 to a depth of 50 m This is the well drilled near the suspected Pu burial site. and cased to total depth. It is tlevation -~ 2.34 m AMSL(S). about 925 m SE from the center of Cactus crater, about 25 m SW of the XRU-3 road and 50 m NE of the lagoon beach. Located on essentially the same Vegetation is very sparse. The well ESE bearing from the center of Cactus was drilled on 3/6/75 to a depth of crater as XRU-2a at a distance of 10 m and cased to total depth. about 190 m from the center of the Elevation - 2.2 m AMSL(S). crater. Drilled from 3/14/74 to 3/21/74 to a depth of 73 m and cased to ARU- 2 total depth. Elevation - 2.68 m AMSL(S). Located about 125 m from the center of Cactus crater along a line running just east of south. Drilled on 3/7/74 XRU-5 Located about 60 m from the center to a depth of 11 m and cased to total of Cactus crater along a line running depth. west of south. Elevation - 2.2 m AMSL(S). This well is just off the crater lip, about 65 m inland ARU-3 Located about from the edge of the lagoon. 115 m from the center Drilled from 3/21/74 to 3/27/74 to a depth of Cactus crater along a line running of 52 m and cased to total depth. midway between east and southeast. Elevation - 1.83 m AMSL(S). -13-