7.4.3 Perey
Background
Island Percy (Marshallese: Taiwel), a small sandbar of only 0.8 hectares in area, is located between
Lucy and Mary in the northeastern quadrant of the Atoll. There is no vegetation on Percy. No
ground zero sites were located on this island nor were there any known or suspected burial sites. The
only structure on the island was an overturned submarine cable terminal box which was the first
debris removed during the cleanup.
1972 Survey Results
Six locations were soil sampled during the 1972 survey; at five of these 0-15 cm core samples were
taken and at the remaining location a 0-35 em profile sample was taken. The profile indicated an
increase in activities for 187Cs, 99Sr and 289,240py to a depth of 8.5 em, then a steady decline in
activities below that.
Characterization and Fission Product Sampling
IMP measurements were not taken on Percy because of its small size but soil samples were collected
during the cleanup. Six locations were surface sampled with four composites at each location for a
total of 24 samples (see Section 4.2.1 for details on the soil sampling procedure). No ratio of TRU to
1am was established because there were no IMP data. The results of the soil sampling are shown
in Figure 7-29 along with the sampling locations. Table 7-4 summarizes the TRU results. The
maximum TRU activity of any soil sample was 17 pCi/g. (See Tech Note 2.18 for additional results
for this sampling.)
~— BL
LAGOON
APPROXIMATE HIGH TIDE LINE, wee
© SOIL SAMPLE LOCATION,
DATUM IS MEAN TRU IN pCi4g
PERCY - TAIWEL
-—H
25m
FIGURE 7-29. COASTLINE AND DATA COLLECTION LOCATIONS FOR ISLAND PERCY
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