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§ 147.2927 Permit modification.
(a) Permits may be modified for the following causes only (with the exceptions listed in paragraph (b) of this section regarding minor modifications):
(1) There are substantial changes to the facility or activity which occurred after permit issuance that justify revised or additional permit conditions.
(2) The Regional Administrator has received information (e.g., from monitoring reports, inspections) which warrants a modified permit.