An air contamination source that fails to pay the fees within the time frame established by the act or by this chapter shall pay a penalty of 50% of the fee amount, plus interest on the fee amount computed in accordance with 26 U.S.C.A. § 6621(a)(2) (relating to determination of rate of interest) from the date the fee was required to be paid. In addition, the source may have its operating permit terminated or suspended. The fee, penalty and interest may be collected following the process for assessment and collection of a civil penalty contained in section 9.1 of the act (35 P. S. § 4009.1).
25 Pa. Code § 127.707