Authority: IC 13-18-3-1; IC 13-18-4-1; IC 13-18-4-3; IC 13-18-4-4; IC 13-18-4-5; IC 13-18-17-5

Affected: IC 4-22-2; IC 13-18-4; IC 13-18-17

Sec. 9. (a) The criteria established in sections 5, 6, 7, and 8 of this rule must be met at and beyond the boundary of the ground water management zone.

(b) An agency, having jurisdiction over a facility, practice, or activity that is subject to the criteria of this rule, may establish an appropriate program specific or site specific three (3) dimensional ground water management zone and shall determine its boundary location and duration considering the following factors:

1. (1) Regulatory program requirements.
2. (2) Design standards.
3. (3) Monitoring frameworks.
4. (4) Hydrogeologic conditions.
5. (5) Risks of human exposure.
6. (6) Impacts to any natural resource and the environment.
7. (7) Property controls.
8. (8) Physical and chemical properties of potential contaminants.

(c) An agency, having jurisdiction over a ground water contamination assessment or remediation that is subject to the criteria of this rule, may establish an appropriate program specific or site specific three (3) dimensional ground water management zone considering the following factors:

1. (1) Regulatory program requirements.
2. (2) Type and amount of a contaminant present.
3. (3) Monitoring frameworks.
4. (4) Hydrogeologic conditions.
5. (5) Risks of human exposure.
6. (6) Impacts to any natural resource and the environment.
7. (7) Property controls.
8. (8) Expected future use of the site.
9. (9) Physical and chemical properties of existing contaminants.

(d) Rules adopted by an agency under IC 4-22-2 to apply the standards in this rule must include a default three (3) dimensional ground water management zone that shall apply if an agency having jurisdiction over a facility, practice, activity, or a ground water contamination assessment or remediation does not establish a program specific or site specific ground water management zone under subsection (b) or (c). The boundary of the default ground water management zone shall be located in accordance with one (1) of the following:

1. (1) At each drinking water well that is:

   1. (A) within three hundred (300) feet from the edge of a potential or existing contaminant source when the property boundary is greater than three hundred (300) feet from the edge of a potential or existing contaminant source; or
   2. (B) within the property boundary when the property boundary is less than three hundred (300) feet from the edge of a potential or existing contaminant source.
2. (2) The property boundary, when the property boundary is less than three hundred (300) feet from the edge of a potential or existing contaminant source, and there is no drinking water well within the property boundary.
3. (3) Three hundred (300) feet from the edge of a potential or existing contaminant source when the property boundary is greater than three hundred (300) feet from the edge of a potential or existing contaminant source and there is no drinking water well within three hundred (300) feet from the edge of a potential or existing contaminant source.

(e) If overlapping ground water management zone boundaries are present at a facility, practice, activity, or ground water contamination assessment or remediation, then the agency or agencies with jurisdiction may combine them.

(Water Pollution Control Division; 327 IAC 2-11-9; filed Feb 4, 2002, 11:00 a.m.: 25 IR 1882; readopted filed Jun 4, 2008, 11:07 a.m.: 20080702-IR-327080207BFA; readopted filed Jul 30, 2014, 4:04 p.m.: 20140827-IR-327140189BFA; readopted filed May 27, 2020, 11:52 a.m.: 20200624-IR-327200186BFA; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA)