Engine Test Facilities


Industrial Boilers


Institutional/Commercial Boilers


Process Heaters


Stationary Internal Combustion Engines 11/15/2000

Table 15-4 Example MACT Categories

Relating to Fuel Production

& Use. Source: 57 Federal Register 44147, September 24, 1992

90% reduction in emissions (95% if the emissions are particulates) prior to the proposal of the applicable MACT standards. Facilities will have to consider technical, regulatory, and economic factors before deciding to undertake the early reduction option.

Accidental Release Requirements

In addition to the MACT programs, the Act requires the EPA to develop regulations to address the potential accidental release of hazardous substances. The goal of these regulations is to focus on chemicals that may pose a significant hazard to the public should an accident occur, to prevent their accidental release, and to minimize the consequences of such releases. In October 1993, the EPA proposed a rule that would require the development and implementation of risk management plans (RMP) by sources that process or store more than a designated amount of a regulated substance. The RMP would include a program to prevent accidental releases and a response program to address accidental releases if they occur. The rule was finalized on August 19, 1996.

In January 1993, the EPA finalized the list of substances of concern and threshold quantities that will determine whether a facility must comply with the accidental release requirements. The EPA's final list includes 100 "acutely toxic" chemicals and 62 "flammable" gases and liquids. This rule addresses only the list of regulated substances and threshold quantities; the regulations for prevention and detection of accidental releases, including the finalization of requirements for the development of risk management plans, will be published at a later date.

State Air Toxics Programs

In the 1980s, when the EPA was making little progress in controlling air toxics, several states moved ahead in developing their own air toxics control programs. Some state programs are well established, while others are still under development or are very simple. Most state programs focus on new sources and address a list of chemicals similar to, but different from, the HAP list. Technology standards similar to MACT and/or ambient air impact limits are typically required. For ambient impact limits, the source must be controlled sufficiently so that modeled downwind air quality levels do not exceed the state's ambient limits for each toxic.

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