When a well is to be destroyed, the open well shall be filled with filler material from the bottom of the well to within two hundred feet of the ground surface. The filler material may be portland cement grout, clay, suitable impervious material, inert pervious material or native soil. Filler material shall be allowed sufficient time for compaction before sealing the remaining two hundred feet. For the protection of the seal and to facilitate the future use of the well site, a hole shall be excavated around the well casing extending horizontally at least three feet from the well casing and to a depth of six feet below the ground surface. The well casing shall be removed to just above this depth. The remaining two hundred feet of the well shall be sealed by placing cement grout to within five feet of the ground surface. The sealing material used to fill the well shall be allowed to spill over into the excavation and form a cap at least one foot thick. After the sealing material has set, the excavation shall be filled with native soil. Gravel-packed wells also require sealing of the annular space. To assure that the annular space is sealed, the well casing shall be ripped or perforated to allow fluid sealing material to reach the space from the well shaft by use of a pressure grouting method until grout returns to the ground surface through the annular space between the drilled hole and the well casing. (Ord. No. 793, § 5.02; Ord. No. 985, § Appx. A.)
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