In addition to the other enforcement provisions of this act, the department may issue a permit under clauses (3) and (4) of subsection (b) of section 6.1¹ to a source that is out of compliance with this act, the Clean Air Act or the regulations promulgated under either this act or the Clean Air Act. Any such permit must contain an enforceable schedule requiring the source to attain compliance. The compliance schedule may contain interim milestone dates for completing any phase of the required work, as well as a final compliance date, and may contain stipulated penalties for failure to meet the compliance schedule. If the permittee fails to achieve compliance by the final compliance date, the permit shall terminate. The permit shall be part of an overall resolution of the outstanding noncompliance and may include the payment of an appropriate civil penalty for past violations and shall contain such other terms and conditions as the department deems appropriate. A permit may incorporate by reference a compliance schedule contained within a consent order and agreement, including all provisions related to implementation or enforcement of the compliance schedule or consent order and agreement.