Authority: IC 25-39-4-2; IC 25-39-4-9

Affected: IC 25-39

Sec. 1. (a) This section governs grouting materials and the installation of grouting materials for new wells.

(b) Grouting materials shall consist of:

1. (1) neat cement with no more than five percent (5%) by weight of bentonite additive;
2. (2) bentonite slurry (which can include polymers designed to retard swelling);
3. (3) pelletized, granular, medium grade, or coarse grade crushed bentonite; or
4. (4) other materials approved by the commission.

(c) This section applies if neat cement or a bentonite slurry is used for grouting. The cement or slurry shall be pumped into place from the bottom of the annular space upward in a continuous operation with a grout pipe or the well casing using the positive displacement method.

(d) Grouting material, other than neat cement or bentonite slurry, shall be introduced in a manner to prevent bridging of the annulus between the outside of the well casing and the borehole.

(e) A borehole annulus shall be grouted upon the earlier of the following:

1. (1) Within twenty-four (24) hours after the installation of the well casing.
2. (2) Before drilling equipment is removed from the site.

(f) This section does not apply to a public water supply well. The installation of a public water supply well is governed by 327 IAC 8-3.4.

(Natural Resources Commission; 312 IAC 13-5-1; filed Nov 22, 1999, 3:34 p.m.: 23 IR 768; readopted filed Aug 4, 2005, 6:00 p.m.: 28 IR 3661; readopted filed May 20, 2011, 3:28 p.m.: 20110615-IR-312110002RFA; readopted filed Jul 19, 2017, 3:45 p.m.: 20170816-IR-312170132RFA; readopted filed May 17, 2023, 10:52 a.m.: 20230614-IR- 312230069RFA)