312 IAC 13-6-3 Cable tool or jetted wells

Sec. 3. (a) This section governs the construction of wells by cable tool or jetting methods. (b) A well installed by cable tool or jetting shall be equipped with casing having a minimum of two (2) inches inside diameter and be cased a minimum of twenty-five (25) feet below ground surface. (c) If well casing is driven or jetted, a borehole with an inside diameter at least two (2) inches greater than the outside diameter of the casing to be driven shall be dug at least three (3) feet, but not more than five (5) feet, below ground surface. The casing shall be centered in the larger diameter borehole. A bentonite slurry, granular bentonite, or medium grade crushed bentonite shall fill the annulus during the installation of the well casing. Notwithstanding 312 IAC 13-5-1(c), bentonite slurry may be introduced into the borehole annulus by gravity methods during the installation of the well casing. (d) Unless otherwise approved by the division, a well must be grouted under section 1 of this rule if either of the following conditions exist: (1) A larger diameter temporary casing is used to install a smaller diameter permanent well casing. (2) A later diameter borehole is drilled to install a smaller diameter well casing. (e) This section does not apply to a monitoring well, a dewatering well, or a public water supply well. The installation of a public water supply well is governed by 327 IAC 8-3.4.