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Section 816.13 Continued. • approved by the regulatory authority, to prevent acid or other toxic drainage from entering ground or surface waters, to minimize disturbance to the prevailing hydrologic balance, and to ensure the safety of people, livestock, fish and wildlife, and machinery in the mine plan and ad~a- cent area. If these openings are uncovered or exposed by surface mining activities within the permit area they shall be permanently closed, unless approved for water monitoring, or otherwise managed in a manner approved by the regulatory authority. Use of a drilled hole or borehole or monitoring well as a water well must meet the provisions of Section 816.53 of this Part. This Section does not apply to holes solely drilled and used for blasting. Each exploration hole, other borehole, well or other exposed under- ground opening (not including holes solely drilled and used for _ blasting) will be cased, sealed or otherwise managed to meet the • ~ requirements of this Section. The methods to be used are described in more detail under Sections 780.18 and 780.21. An analysis of the overburden is discussed in Section 779.14 and indicates an absence of any acid or toxic material. Section 816.14 Casing and sealing of drilled holes: Temporary. Each exploration hole, other than drill or boreholes, wells and other exposed underground openings which have been identified in the approved permit application for use to return coal processing waste or water to underground workings, or to be used to monitor ground water conditions, shall be temporarily sealed before use and protected during use by barricades, or fences, or other protective devices approved by the regulatory authority. These devices shall be periodically inspected and' maintained in good operating condition by the person who conducts the surface mining activities. 816-5