290
RADIOLOGICAL CLEANUP OF ENEWETAK ATOLL
AREA RESURVEY
After each 6-inch cut, additional soil samples were taken and analyzeq
and the area was resurveyed byin situ van (Figure 6-8). If the resuns
exceeded the desired limit, additional cuts were made until the limit was
achieved. The initial goal on Aomon was to remove concentrations to
below 40 pCi/g. For most of the Aomon areas excised, one cut was
sufficient to lower the contamination to acceptable limits.
Subsurface contamination in the Kickapoo area was found to be fa,
more extensive than the preliminary ERSP survey had predicted. It was
impossible to determine whether it had been there previously or had been
mixed in from the surface by the soil removal equipment. Extensive
subsurface samples were taken before the secondlift to see which was the
case.65 Analysis of the samples indicated significant subsurface
contamination throughout the area except wherethefirst lift had removeg
the surface contamination.
Therefore,
the initial subsurface
characterization had to have been inaccurate, probably because it was
based on too few samples. The solution was to take more subsurface
samples.66
a. ARTES
Once a determination was made that areas were within acceptablelimits,
the IMP surveyedall routes to the beach stockpile. Upon removal from the
FIGURE 6-8.
RESURVEY OPERATION.