10 CSR 23-4.080 - Plugging of Monitoring Wells
(1) When plugging a monitoring well, the
following minimum requirements shall be met:
(A) Remove all pumps, sampling equipment,
debris, or other substances;
(B)
Remove the surface completion from the borehole ensuring that the grout seal is
not disturbed. Cut off riser pipe and/or casing two feet (2') below ground
surface;
(C) Fill the well from
bottom to within one foot (1') of ground surface with grout pursuant to
10 CSR
23-4.060(9);
(D) After the grout is fully cured, check for
settlement and top off if necessary. Fill remaining hole with soil or
pave.
(E) Flush mount completions
in paved areas may be left in place and filled with asphalt or
concrete;
(F) A monitoring well may
be completely excavated as opposed to being plugged with grout. If the well is
over drilled, the borehole shall be completely filled with grout pursuant to
10 CSR
23-4.060(9); and
(G) A non-restricted monitoring well
installation contractor must be on site at all times during the excavation and
plugging operations.
(2)
Temporary monitoring wells ten feet (10') or greater in depth must be plugged
by removing any temporary pipe and filling the well from total depth to two
feet (2') from the ground surface with approved grout, with the remainder of
the well filled with compacted uncontaminated native material or grout.
Temporary monitoring wells shall be plugged within thirty (30) days of the date
of completion.
Notes
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