User's Manual

FIELD EQUIPMENT
NUSEIS
Geophysical Technology Inc Field Equipment Page | 64
NuSeis Drill Bits
• The type of drill bit to use to form a hole for the NRU is dependent on the type of ground and
surface conditions.
• It may be necessary to do a final solutioning of a drilled hole with a MDT to consolidate the sides
of the hole and tamp any loose material that may have fallen into the hole during drill bit
removal.
• Depth to be drilled is dependent on the model of NRU in use, M series or N series.
• Can be used with either the PDT-B or PDT-H
• In areas of solid rock, where there is no way to find enough open ground to install an NRU
securely, custom rock coring bits are available. Used in conjunction with the PDT-F.
Figure 53