40 CFR 124.211 - What types of changes may I make to my standardized permit?
You may make both routine changes, routine changes with prior Agency approval, and significant changes. For the purposes of this section:
(b) “Routine changes with prior Agency approval” are for those changes to the standardized permit that would qualify as a class 1 modification with prior agency approval, or a class 2 permit modification under 40 CFR 270.42, appendix I; and
(c) “Significant changes” are any changes to the standardized permit that:
(2) Are not explicitly identified in 40 CFR 270.42, appendix I; or
(3) Amend any terms or conditions in the supplemental portion of your standardized permit.