ll.
Discussion turned to sampling increment to be utilized.
Increments
discussed included the averaged 10 centimeter depth used for most of
the available data; averaged 20 centimeter depth, based-on a nominal 6-inch
cut capability for a dozer; and 20 centimeter increments with a specific
The operations plan specifies
5 centimeter sample from each increment.
Five
5 cm sample depth because of past experience at Nevada Test Site.
centimeter depth samples will be the basis for certification of the condiDiscussion included
tion of the islands upon completion of cleanup.
the advantages and disadvantages of horizontal averagingversus vertical
averaging for sampling.
Discussion
Consensus favored vertical averaging.
also included the capability of the laboratory to analyze the samples
Maximum capability would be about 150 samples per day for gamma
produced.
scan and gross alpha count plus about five percent radiochemical analysis.
Other operations
This level would not permit support of other operations.
It was agreed
could be supported at levels of 50 samples per day input.
that gamma scan of samples at the laboratory could be used to select
Other
Only the "hot" samples would be analyzed.
samples for analysis.
samples would be held for future use depending on the outcome of the "hot"
samples analysis.
This technique was favored over using gamma scan on
This
sample site sidewalls and only sampling "hot" areas (see encl 9).
concluded the first day's discussion.
12. Discussion resumed on 5 October. The chair outlined the two
incremental sampling techniques discussed and proposed adoption of 29 cm
sampling increments with a discrete 5 cm sample to be taken from each
20 cm increment.
This technique should suffice for characterization and
may also meet some certification requirements.
The proposal was accepted.
13.
The chair requested the group consider depth to which sampling should
extend.
Consensus indicated that a depth of 120 cm generally will suffice
but that the option to go deeper should be left to field personnel.
[It
may be particularly desirable to go to greater sampling depths in areas
of ground zeros, in burm or mound areas, and in ejecta areas near Cactus
crater. The backhoe may not suffice for some of these depths (greater
than 10 feet) and other equipment may be required.
14.
tion.
Discussion reverted to the sampling grid to be used for characterizaMr. Church proposed, for consideration, a 10 meter grid for the
“hot'' areas (Fig/Quince and Cactus crater areas), and a wider spaced grid
for the “cool'" area in between. Several members indicated their support
for the half distance technique for initial exploration with grid size
to be decided later based on data obtained from initial efforts. This
lead to extensive discussion of desire for data versus reasonable expenditure of resources and purpose and extent of characterization. The chair
maintained that characterization should be limited to determining the
extent of known subterranean pockets and the extent of surface contamination areas.
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