§ 33.161. Definitions.

 The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:

   Developed area—Any space within a developed facility which has been approved by the Department.

   Developed facility—The space developed for use or occupancy within mined out areas, that is, approaches and occupied space.

   Employe—Any person who is hired or employed for any given task.

   Employer—The owner or other person hiring help to perform any given task.

   Harmful concentrations of gases—Those concentrations in excess of the permissible levels established by the Department of Environmental Protection in 25 Pa. Code Chapter 201 (Reserved).

   In use—Lawfully occupied by a person or persons engaged in the performance of their duties or in other authorized activity.

   Leaseholder—Persons, governmental agencies, firms, corporate bodies or agencies which hold a lease on a developed area.

   Mined out—Depleted to that no further mining is contemplated.

   Operator—Persons, firms, corporate bodies or governmental agencies managing the business conducted within a developed area.

   Outside air—Air moving through the mined out passageways after entering them through the main or accessory portals by mechanical or natural forces.

   Owner or developer—Firms, corporations, companies or individuals who are in legal possession of a developed or undeveloped area.

   Pure air—Air containing not less than 19.5% oxygen, not more than 0.5% carbon dioxide and no harmful quantities of other noxious or poisonous gases.

   Undeveloped area—The mined out area not approved by the Department for regular use or occupancy.