Ohio Rev. Code Ann. § 1513.35
(A) In addition to the other requirements of this chapter, each permit issued by the chief of the division of mineral resources management under section 1513.07 of the Revised Code for underground coal mining shall require the operator to:
(9) Minimize the disturbances of the prevailing hydrologic balance at the minesite and in associated offsite areas and to the quantity of water in surface and ground water systems both during and after coal mining operations and during reclamation by:
(a) Avoiding acid or other toxic mine drainage by such measures as, but not limited to: