Section 312IAC13-5-1. Materials and installation

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

  (b) Grouting materials shall consist of:

(1) neat cement with no more than five percent (5%) by weight of bentonite additive;

(2) bentonite slurry (which can include polymers designed to retard swelling);

(3) pelletized, granular, medium grade, or coarse grade crushed bentonite; or

(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) Within twenty-four (24) hours after the installation of the well casing.

(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)