Nev. Admin. Code § 534.4371 - Boreholes: Plugging requirements
1. A geotechnical
soil boring must be plugged within 60 days after the date on which the drilling
of the geotechnical soil boring is completed.
2. Except as otherwise provided in
subsections 3 and 4, a geotechnical soil boring must be plugged in the manner
prescribed for plugging a well in NAC
534.420
or authorized pursuant to NAC
534.422.
3. If there is evidence that water-draining
formations (lost circulation), or water-bearing formations of different water
quality or hydraulic head were encountered during the original geotechnical
soil boring construction and if bentonite chips or bentonite grout is used as
the plugging material, the well driller must, in addition to the requirements
of this section and NAC
534.420
or
534.422,
as applicable, place neat cement across the water-confining formations so that
the plugging fluid penetrates the geologic formation to prevent the vertical
movement of water. Any drilling casing or pipe that does not break free, and
occludes the placement of neat cement across a confining formation, must be
perforated so that the plugging fluid penetrates the annular space and the
geologic formation in that interval.
4. If the water-bearing formations are
unknown and any drilling casing or pipe does not break free, the well driller
must plug the geotechnical soil boring in accordance with subsection 5 or 6 of
NAC
534.420,
as applicable, so that the plugging fluid penetrates the annular space and the
geologic formation in the perforated intervals.
Notes
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