34
ERDC/CRREL TR-02-12
The Discrete Interval Sampler was much easier to use than the Pneumo
Bailer. However, neither device appeared to disturb the well or elevate the
turbidity when sampling, and the results from these studies indicate that these
two devices are fairly comparable. In the standpipe experiments, both devices
generally recovered representative concentrations of the explosives, pesticides,
and metals. Any difference in the concentrations of the VOCs in samples taken
with these devices vs. control samples was generally small, including the field
study. However, during the course of the VOC and field studies, both devices did
on occasion yield unusually low values that appeared to be anomalous, and this
may be cause for concern.
One final concern we have is that because of an equipment problem, we did
not monitor the effect these devices had on dissolved oxygen levels in the wells
or standpipe. The operation of these devices, especially the Kabis Sampler and
HydraSleeve, could affect this parameter and thereby affect the concentrations of
oxygen-sensitive analytes.
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