OPERATION WIGWAM DATS: TIME: POI 14 May 1955 L300 GMT 1h May (L955 2000 Sponsor: SITE: Pacific Ocean 00 miles Southwest of San Diego 28° hh' 126° 16' TOTALYIELD: 30 kt FLREBALL DATA: DoD oN WwW Site elevation: HBIGHPEOF BURSP: Time to lst minimum: NM Time to 2nd maximum: NM Radius at 2nd maximum: NM Sea level e000 ft under- water depth 16,000 ft TYPE OF BURST AND PLACKMENT: Subsurface burst ~ Device suspended by cable from barge SPRAY DOME H&IGHT: 880 ft MSL FIRST PLUME HETGHT: 1,450 ft MSL REMARKS: "The contours given (for H+1.4 hour) were computed on the basis of surface and subsurface water samples and are roproduced here uncorrected. They do not represent fallout activity deposited on the surface. The activity was mixed throughout a surface zone whose depth remained roughly constant for the first two days. This contaminated zcne resulted from debris thrown out locally during the surface events or from upwelling of contaminated water from below. The downwind airborne radivcactivity varied with the base surge and yielded very little if any residual fallout." At H+l19 minutes the contaminated water area was about 5.3 mi®. The area was contaminated in an irregular manner, the peak intensities being approximately three times the average intensity of 25 to 30 v/hy, 3 ft above the surface. The area circumscribed by a 50 mr/hr isointensity contour increased to 7.5 mi® at Hil. hr. At H+h.2 hr it had decreased to 3.5 mi®. Measurements of water samples indicated a radioactive decay exponent 97