904.12—State program provisions and amendments not approved.
         The following amendments to the Arkansas Surface Coal Mining and Reclamation Code as submitted to OSMRE on May 1, 1987, are hereby disapproved:
    
    
        
        (a) 
         ASCMRC  part 722, all revisions and additions which address surface coal mining and reclamation operations previously exempted under the 2-acre exemption rule of  section 528 of SMCRA.