Upon the consent of the permittee, the Secretary may modify a permit to make the corrections or allowances for changes in the permitted activity identified in Regulations .13-1—.13-3 of this chapter without following the procedures of Regulations .20—.20-6 of this chapter. Any permit modification not processed as a minor modification under this regulation and Regulations .13-1 —.13-3 of this chapter shall be made for cause and with the draft permit and public notice as required in Regulation .11 of this chapter.