Aqueous Film Forming Foam (AFFF), a substance commonly used by firefighters, contains ethanol, 2-(2-butoxyethoxy) which is categorized as a glycol ether. Glycol ethers meet the definition of hazardous substance in CERCLA 101(14) because they are hazardous air pollutants pursuant to 112(b) of the Clean Air Act. In 1990, the Clean Air Amendments added 47 individual hazardous air pollutants and five (5) hazardous air pollutant categories, including the broad category of glycol ethers. These hazardous air pollutants, newly identified as hazardous substances, automatically received a reportable quantity of one (1) pound (CERCLA 102(b)).