§ 33.213. Pillars along property lines.

 The surveys of the face of the workings along the pillar shall be made in duplicate and shall practically agree. A copy of these duplicate surveys, certified to, shall be filed with the owners, contractor, or superintendents of the adjoining caverns, and with the Department. If no cavern operations are contemplated, or are in progress on the adjoining property, the owner, contractor, or superintendent is not required to file a copy of this survey with the persons in legal possession of the adjoining property and cavern operations may be carried right up to the boundary of each adjoining property.