The department shall have the right to enter upon and inspect all surface mining operations for the purpose of determining conditions of health or safety and for compliance with the provisions of this act, and all rules and regulations promulgated pursuant thereto. The department may issue such orders as are necessary to aid in the enforcement of the provisions of this act. Such orders shall include, but shall not be limited to, orders modifying, suspending or revoking permits, licenses and orders requiring persons to cease operations immediately. The right of the department to issue an order under this act is in addition to any penalty or requirement which may be imposed pursuant to this act. If the department intends to revoke or suspend a license, it shall provide an opportunity for an informal hearing before suspending or revoking the license. Fifteen (15) days notice of the informal hearing shall be given unless the department determines that a shorter period is in the public interest.