Section 327 IAC 8-3.4-21 - Cable tool well drilling procedure requirementsAuthority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-4-1
Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2
Sec. 21.
A well constructed using cable tool drilling shall be drilled in accordance with the following:
(1) A borehole, with an inside diameter at least three (3) inches greater than the outside diameter of the well casing to be driven, shall be dug to a depth of at least three (3) feet, but no more than five (5) feet, below the ground surface.(2) The well casing shall be centered in the larger diameter borehole, and the borehole shall remain full of a bentonite slurry or granular bentonite during the installation of the well casing.(3) Notwithstanding section 23 of this rule, bentonite slurry may be introduced into the borehole annulus by gravity methods in a manner to prevent bridging.(4) 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.(5) The well must be grouted in accordance with section 23 of this rule if one (1) of the following occurs: (A) A larger diameter temporary casing is used to install a smaller diameter permanent well casing.(B) A larger diameter borehole is drilled to install a smaller diameter well casing.Water Pollution Control Board; 327 IAC 8-3.4-21; filed Jun 17, 1999, 1:50 p.m.: 22 IR 3376; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFAReadopted filed Jun 6, 2019, 1:59 p.m.: 20190710-IR-327190246BFA