— 14N — 12N LEGEND APPROXIMATE SHORELINE * = 5OMGRID STAKE NOT SAMPLED OQ = SIDEWALL PROFILE LOCATION (198) & = NUCLEAR TEST GROUND ZERO Xx _ 10N = SURFACE, 10 AND 20 CM COMPOSITES (7) — 8N — 6N — 4N — 2N — BL o oD — 28 Ct o . . : . x — 45 Cnnon @ o000 ceo — 85 _ 105 N 0 50 METERS — 125 FIGURE 6-20. SUBSURFACE SAMPLING LOCATIONS ON ISLAND SALLY PRIOR TO 25 APRIL 1978 consequently, about 200 feet of the 300-foot tower remained standing following the blast. Prior to detonation of the Mohawk device about three weeks later, the anchor cables on the Mohawk side of the remaining Kickapoo tower were cut. The blast from Mohawk seattered Kickapoo tower debris onto the reef. This debris was later collected, cut into smaller pieces, and placed in a tidal pond beside the Sally-Tilda causeway (the Aomon Crypt. See Section 6.8). Definition of subsurface contamination around the Kickapoo GZ was never accomplished with much precision. Even after all soil had been removed down to beach rock, a long, narrow strip of elevated TRU activity was measurable on the coral bedrock along the shoreline. An unproved explanation of how the contamination came to be whereit is, is that the Kickapoo blast blew away the loose material in the immediate area, then when the debris was retrieved from the reef, it was spread along the beach to be eut up and small particles of plutonium fell onto the rocks where natural processes bound the plutonium into the rock. Later, wave action deposited new sand on top of the contaminated area, along with radioactive particles washed up from the reef where the tower piecesfell. 189 "7!" Subsurface contamination in the vicinity of the Kickapoo GZ on Sally was also an apparent anomaly. Test records indicate that the Kickapoo device did not reach the designed nuclear yield;