As used in this article, unless the context requires a different meaning: “Exploration activity” means and is limited to the drilling of test holes or stratigraphic or core holes of a depth in excess of 50 feet for the purpose of determining the location, quantity, or quality of uranium ore. “Person” means any individual, firm, corporation, partnership, association, or other legal entity. “Usable quality water” means groundwater that is used or can be used for a beneficial purpose, including a domestic, livestock, or irrigation use.