You may make both routine changes, routine changes with prior Agency approval, and significant changes. For the purposes of this section:
(a) ``Routine changes'' are any changes to the standardized permit that qualify as a class 1 permit modification (without prior Agency approval) under 40 CFR 270.42, appendix I, and
(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:
(1) Qualify as a class 3 permit modification under 40 CFR 270.42, appendix I;
(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.