327 IAC 8-3.4-20 Rotary well drilling procedure requirements

Sec. 20. A well constructed using rotary drilling shall be drilled in accordance with the following: (1) The borehole shall be at least three (3) inches greater in diameter than the outside diameter of the proposed casing. (2) The well shall be cased to a minimum depth of fifty (50) feet below the ground surface unless otherwise approved by the commissioner according to section 27 of this rule. (3) A production well constructed in an unconsolidated formation shall be gravel packed with silica gravel to an elevation at least ten (10) feet above the elevation of the top of the well screen. (4) The well shall have a minimum of twenty-five (25) feet of the borehole annulus grouted in accordance with section 23 of this rule. (5) A well penetrating bedrock shall have the borehole annulus grouted, in accordance with section 23 of this rule, from the bottom of the well casing, or the top of the formation packer to the ground surface or pitless adapter connection.