...an emission standard applicable to such source. (5) MODIFICATION.— The term "modification" means any physical change in, or change in the method of operation of, a major source which increases the actual emissions of any hazardous air pollutant emitted by such source by...

...an emission standard applicable to such source. (5) MODIFICATION. — The term "modification" means any physical change in, or change in the method of operation of, a major source which increases the actual emissions of any hazardous air pollutant emitted by such source by...

...of such emissions in the categories and subcategories. (g) MODIFICATIONS.— (1) OFFSETS.— (A) A physical change in, or change in the method of operation of, a major source which results in a greater than de minimis increase in actual emissions of a hazardous air pollutant...

...'modification" la defined in 5 111 of the Act. Specifically, section lll(a)(2) defines ••edification' as: any physical change in, or change in the method of operation of, a stationary source which Increases the amount of any air pollutant emitted by such source or which results...

...and Automobile Emission Control, Doc. No. 24, 93d Cong., 2d Sess., pt. 1, at 91 (1974). MODIFICATION: Any physical change in, or change in the method of operation of, a stationary source which increases the amount of any air pollutant emitted by such source or which results...

...environmental impacts. "Low terrain" means any area other than high terrain. "Major modification" (1) Means any physical change in or change in the method of...increase of any pollutant subject to regulation under the federal Clean Air Act. (2) Any net emissions increase that is significant for volatile organic compounds...

...those that will cause more than a de minimis increase in actual emissions. Section l l2(a)(5) defines "modification" as "any physical change in, or change in the method of operation of, a major source which increases the actual emissions of any hazardous air pollutant emitted by such source by...

...under this part shall ensure that increased emissions of volatile organic compounds resulting from any physical change in, or change in the method of operation of, a stationary source located in the area shall not be considered de minimis for purposes of determining...

...to a major source requires a new source review ("NSR") permit process. CAA § 173. A modification is "any physical change in, or change in the method of operation of, a stationary source which increases the amount of any air pollutant emitted by such source or which results...

...to the increase in emissions of volatile organic compounds ("VOCs"). A major modification is defined as: [A]ny physical change in or change in the method...any pollutant subject to regulation under the Act. 40 CFR § 52.21(b)(2)(i).3 Although VOCs are not regulated under the Act, they are a precursor to the...