116
RADIOLOGICAL CLEANUP OF ENEWETAKAq
Lt
MOBILIZATION
MAT. /SUPPLIES
PROCURE
SHIP
EQUIP.
PROCURE
SHIP
DEMOBILIZATION
a
CLEAN UP
CONSTRUCTION
BASE CAMP
REMOTESITE
CLEAN UP
TEAM A
TEAM B
TEAM C
ADVANC
ARRIVES
r
FIGURE 2-7, OPERATION SCHEDULE (MONTHS).
Containment would be accomplished by mixing contaminated soil,
cement, and salt water into a slurry and pumping the mixture through
pipes to a tremie barge, then to the bottom of the crater. By keeping the
discharge end of the tremie pipe at least | foot beneath the top surface of
the previously placed slurry, a monolithic mass would be accumulated,
gradually displacing the water from the crater. All contaminateddebris was
to be removed from theislands and encapsulated in the slurry during this
phase. When the water becametoo shallow to float the barge, the tremie
operation would stop andtheslurry line would be held by a crane moving
slowly around to form a mound. During the inactive periods in the
containment operation, Team C personnel would assist Team B in their
cleanup of Runit, the last and largest soil cleanup operation. After all
contaminated debris and soil had been contained, a cleanup of the
containment site would be conducted to assure that all contaminated
material was in the container before the concrete cap was begun. The
container would be covered with an 18-inch-thick concrete cap. Once the
cap was complete, the stone mole would be grouted with noncontaminated
material to provide a structure more resistantto theeffects of the sea.248
The CONPLANcleanup schedule was based on man-hour estimates
taken from the Enewetak Engineering Study and adjusted for such factors
as weather, radiological safety, and emergencies.249 The concept planners
estimated that cleanupofall plutonium contamination over 40 pCi/g on Il