so:
erations
Soil Cleanup Op
“«h had been established for the {977 transuranic characterization
Additional DOE, LLL, and contractor personnel arrived on the
whic
survey: ring the next 2 weeks and, with backhoe support by the USAE,
atoll teecting soil samples. Using procedures prescribed by LLL, six
beee | profile soil samples of about 1,000 cubic centimeters each were
the
verfrom a backhoe trench wall at each grid point, at intervals from
plants.
food
of
zone
root
ken e to a depth of 60 centimeters, the principal
surfae dose estimates were to be based on samples taken at 100-meter grid
Yevals. If additional information became necessary, the other available
from the 50-meter grid would be analyzed. 64
insamples
*° Where subsurface transuranic contamination was discovered, samples
precisely
were taken on even smaller grids (25, 12.5, 6.25 meters) to define
unknown
previously
of
areas
Five
removal.
soil
additionat
the area for
subsurface transuranic concentrations which exceeded Condition D (160
oC i/g over one-sixteenth hectare) were found on Bokenand one on Lujor.
These were subsequently removed. The Fission Products Data Base
Survey sampling effort was given high priority and completedin less than 2
months, compared to the expected 6 months. Someresults of the DOE
Fission Products Data Base Survey are compared with results of the 1972
AEC radiological survey at Figure 7-47,65
Sr-90
Enjebi (Janet)
Agj (Olive)
1972
1979
1972
44
23.7
16
45
Lujor (Pearl)
Cs-137
1.5
17
0.18
1979
13.7
3.8
7.6
Aomon(Sally)
8.4
3.1
3.0
1.9
Bijire (Tilda)
8.7
4.2
1.0
3.1
Lojwa (Ursula)
6.8
2.4
1.7
1.4
Alembel(Vera)
6.3
0.4
2.0
2.8
Billae (Wilma)
3.3
0.2
1.3
0.8
NOTE: Mean average pCi/g in top 15 cm per 1972 Enewetak Radiological Survey by AEC
and 1979 Fission Products Data Base Survey by DOE.
FIGURE 7-47. COMPARISON OF FISSION PRODUCTS
SOIL CONCENTRATIONS1972 - 1979.