In the event of abandonment of any water supply well or other
type of well the proper procedure and materials shall be used as
(a) The well shall be plugged
to prevent the entrance of surface water, circulation of water between or among
producing zones, or any other process resulting in the contamination or
pollution of Groundwater resources.
(b) In the event of temporary abandonment or
discontinuance of the use of any well, the well shall be sealed with a
watertight cap or seal, as provided in subsection (e) of this
(c) The well shall be
chlorinated prior to abandonment using a chlorine solution with a minimum
concentration of one hundred fifty parts per million (150 ppm) of chlorine.
(d) The well shall be checked from
land surface to the entire depth of the well before it is sealed, to insure
against the presence of any obstruction that will interfere with sealing
(e) The well bore shall
be filled and sealed with any of the following materials: neat cement grout,
sand cement grout, bentonite clay grout, or sand clay or bentonite cement
grout. Dug wells may be abandoned with clean sand and gravel.
(f) The grout material shall be placed in
such a way to prevent voids in the grout or dilution of the grout.
(g) Any well constructed in a consolidated
rock formation, may be filled with fine sand in the zone or zones of
consolidated rock. The top of the sand fill shall be at least ten (10) feet
below the bottom of the casing, and the remaining portions of the well shall be
filled with neat cement grout, sand cement grout, bentonite clay grout, or sand
clay or bentonite cement grout.
Any test well or bore shall be abandoned in such a manner that it does not
become a channel for the vertical movement of water or other substance to the
potable Groundwater resources.
Deep waste disposal or oil wells with casings free of any breaks, and extending
below the potable Groundwater zones, may be sealed with a watertight cap or
(j) Upon completion
of abandonment of the well, the top of the casing or grout material may be
terminated at least four (4) feet below the ground surface.