— @N
— BL
LEGEND
® = 50M GRID STAKE NOT SAMPLED
© = AUGERED PROFILE LOCATION (39)
(C= SIDEWALL PROFILE LOCATION (34)
x = SURFACE, 10 AND 20 CM COMPOSITE {7}
APPROXIMATE
SHORELINE \
0
METERS
FIGURE 6-17. SUBSURFACE SAMPLING LOCATIONS ON ISLAND IRENE PRIOR TO 25 APRIL 1978
According to DNA OPLAN 600-77, the Cleanup Phase, including soil removal, was scheduled to
begin 15 November 1977; debris removal did start on schedule. By mid-January 1978, DNA -had
become quite concerned that soil removal had not yet begun. DNA wanted to know for planning
purposes which islands would require soil removal and the approximate volume of soil to be removed,
identified by source as either surface or subsurface. Following an interagency problem resolution
meeting in January, it was agreed that characterization of the northern islands would be completed
in time to provide the necessary planning parameters to a decisionmaking conference scheduled for 3
May.
except
Up to the end of January, the ERSP had directed efforts toward the ground zero islands,
for
surface
sampling on
Vera
and
Olive.
Beginning
in
early
February,
surface
characterization of the other northern islands was assigned a higher priority than subsurface
profiling on ground zero islands. The change in emphasis can be seen in Table 6-6. A large number
of soil samples had to be collected and analyzed to meet the 3 May commitment.
All sample results
available on 25 April were plotted on maps and used to generate estimates of the volume of soil to
be removed from each island. (Tech Note 7 provides some details on the procedure used.) Several
very important decisions (discussed in Chapter Two) were made at the 3-4 May 1978 conference
based, at least in part, on the soil removal estimates provided by the ERSP.
A large numberof soil samples was collected to fulfill the tasks described above and they all had to
be worked through the laboratory before results could be interpreted. By late April 1978, sufficient
results were out of the laboratory to allow meaningful interpretation. The conelusions, in general,
indicated the locations of subsurface pockets of contamination, but not the boundaries of the areas
requiring excision. Detailed sampling plans were prepared and executed in an effort to define
excision boundaries. By this time, the Pilot Soil Removal Project (Section 6.6) was in full swing so
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