104 STAT. 2532 PUBLIC LAW 101-549—NOV. 15, 1990 under this section establishing 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 more than a de minimis amount or which results in the emission of any hazardous air pollutant not previously emitted by more than a de minimis amount. "(6) HAZARDOUS AIR POLLUTANT. —The term 'hazardous air pollutant' means any air pollutant listed pursuant to subsection (b). "(7) ADVERSE ENVIRONMENTAL EFFECT.—The term 'adverse environmental effect' means any significant and widespread adverse effect, which may reasonably be anticipated, to wildlife, aquatic life, or other natural resources, including adverse impacts on populations of endangered or threatened species or significant degradation of environmental quality over broad areas. "(8) ELECTRIC UTILITY STEAM GENERATING UNIT.—The term 'electric utility steam generating unit' means any fossil fuel fired combustion unit of more than 25 megawatts that serves a generator that produces electricity for sale. A unit that cogenerates steam and electricity and supplies more than onethird of its potential electric output capacity and more than 25 megawatts electrical output to any utility power distribution system for sale shall be considered an electric utility steam generating unit. "(9) OWNER OR OPERATOR. — The term 'owner or operator' means any person who owns, leases, operates, controls, or supervises a stationary source. "(10) EXISTING SOURCE. —The term 'existing source' means any stationary source other than a new source. "(11) CARCINOGENIC EFFECT.— Unless revised, the term 'carcinogenic effect' shall have the meaning provided by the Administrator under Guidelines for Carcinogenic Risk Assessment as of the date of enactment. Any revisions in the existing Guidelines shall be subject to notice and opportunity for comment. " (b) LIST OF POLLUTANTS.— "(1) INITIAL UST. —The Congress establishes for purposes of this section a list of hazardous air pollutants as follows: numter Chemical name 75070 Acetaldehyde 60355 Acetamide 75058 Acetonitrile 98862 Acetophenone 53963 2-Acetylaminofluorene 107028 Acrolein 79061 Acrylamide 79107 Acrylic acid 107131 Acrylonitrile 107051 AUyl chloride 92671 4-Aminobiphenyl 62533 Aniline 90040 o-Anisidine 1332214 Asbestos .
�
