Source Modification

{
  "id": "MLC-T-ENV-026197",
  "term": "Source Modification",
  "field": "Environment",
  "definition": "1. Any physical change in, or change in the method of operation of, a stationary source which increases the emission rate of any pollutant for which a national standard has been promulgated under part 50 of this chapter or which results in the emission of any such pollutant not previously emitted, except that:(1) Routine maintenance, repair, and replacement shall not be considered a physical change, and(2) The following shall not be considered a change in the method of operation:(i) An increase in the production rate, if such increase does not exceed the operating design capacity of the source;(ii) An increase in the hours of operation;(iii) Use of an alternative fuel or raw material, if prior to the effective date of a paragraph in this part which imposes conditions on or limits modifications, the source is designed to accommodate such alternative use.\n\n2. Any physical or operational change at a source that would cause an increase in the allowable emissions of a minor source or an increase in the actual emissions (based on the applicable test under the major NSR program) of a major source for any regulated NSR pollutant or that would cause the emission of any regulated NSR pollutant not previously emitted.\n\n3. Any physical or operational change at a source that would cause an increase in the allowable emissions of a minor source or an increase in the actual emissions (based on the applicable test under the major NSR program) of a major source for any regulated NSR pollutant or that would cause the emission of any regulated NSR pollutant not previously emitted. Allowable emissions of a emitted minor source include fugitive emissions, to the extent that they are quantifiable, only if the source belongs to one of the source categories listed in part 51, Appendix S, paragraph II.A.4(iii) or § 52.21(b)(1)(iii) of this chapter, as applicable. The following exemptions apply: (1) A physical or operational change does not include routine maintenance, repair or replacement. (2) An increase in the hours of operation or in the production rate is not considered an operational change unless such change is prohibited under any permit condition that is enforceable as a practical matter. (3) A change in ownership at a stationary source. (4) The emissions units and activities listed in § 49.153(c).\n\n4. Any physical change in or a change in the method of operation of, an existing source which increases the amount of particulate matter emitted by that source. The following shall not, by themselves, be considered modifications: (1) Maintenance, repair, and replacement which the Regional Administrator determines to be routine for the particular source; (2) An increase in production rate of an existing source, if that increase can be accomplished without a physical change to the source or the Astaris-Idaho facility;(3) An increase in the hours of operation of an existing source, if that increase can be accomplished without a physical change to the source or the Astaris-Idaho facility;(4) Use of an alternative fuel or raw material, if the existing source is capable of accommodating that alternative without a physical change to the source or the Astaris-Idaho facility; or (5) The addition, replacement, or use of any system or device whose primary function is the reduction of an air pollutant, except when an emissions control system is removed or replaced by a system which the Regional Administrator determines to be less environmentally beneficial.\n\n5. Meaning given in the applicable requirements incorporated into §§ 55.13 and 55.14 of this part, except that for two years following the date of promulgation of this part the definition given in section 111(a) of the Act shall apply for the purpose of determining the required date of compliance with this part, as set forth in § 55.3 of this part.",
  "references": [
    "40 CFR 52.01 (CFR 2013)",
    "40 CFR 49.152 (CFR 2013)",
    "40 CFR 49.10711 (CFR 2013)",
    "40 CFR 55.2 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/source-modification/"
}