MACT - Part 63 | Region 10 | US EPA

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MACT - Part 63

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Four February MACT were signed on schedule:

Rules requiring four industries to upgrade their facilities by installation of Maximum Achievable Control Technologies (MACTs) were announced on February 26, 2004 by the U.S. Environmental Protection Agency (EPA). The four rules issued on February 26 complete the application of technology based national emissions standards called for under the 1990 Clean Air Act. With these rules, EPA has issued 96 MACT standards to reduce toxic emissions from over 160 categories of industrial sources. These rules cover: Industrial, Commercial and Institutional Boilers and Process Heaters; Plywood and Composite Wood Products; Stationary Reciprocating Internal Combustion Engines (RICE), and Automobile and Light Duty Trucks Manufacturing (Surface Coating).

Plywood MACT (PDF) (3pp, 34K): The plywood MACT covers about 220 facilities that manufacture plywood and veneer; particleboard; medium density fiberboard; hardboard; fiberboard; oriented strandboard; and engineered wood products. The final rule will reduce emissions of acetaldehyde, acrolein, formaldehyde, methanol, phenol, propionaldehyde and other toxic air pollutants between 6,600 - 11,000 tons per year, or a 35 to 58 percent reduction from 1997 levels. The final plywood rule also will reduce the emissions of volatile organic compounds between 14,000 - 27,000 tons per year, or a 28 to 52 percent reduction from 1997 levels. Volatile organic compounds contribute to the formation of ground-level ozone, or smog.

Auto Coatings MACT (PDF) (3pp, 24K): Automobile and light-duty truck surface coating operations refer to the application of decorative, protective, or functional coatings to new automobile and light-duty truck bodies and body parts. Coating materials include such things as primer, primer-surfacer, topcoat, sealer, sound deadener, and windshield primer and adhesive. Automobile and light-duty truck surface coating operations emit a number of toxic air pollutants including xylenes, toluene, ethyl benzene, ethylene glycol monobutyl ether, methyl ethyl ketone, and methyl isobutyl ketone. The MACT rule will reduce total emissions of these air toxics by approximately 6,000 tons per year, a 60 percent reduction from the estimated 1997 baseline.

RICE MACT (PDF) (3pp, 33 K): Stationary reciprocating internal combustion engines (RICE) are used at facilities such as pipeline compressor stations, chemical and manufacturing plants, and power plants. EPA estimates that 1,600 new stationary RICE will be affected each year. In addition, about 1,800 existing stationary RICE may potentially be subject to the rule. The final rule will reduce emissions of some 5,600 tons/year of toxic air pollutants such as formaldehyde, acrolein, methanol, and acetaldehyde. In addition, the emissions of nitrogen oxides and PM will be reduced by 160,000 tons and 3,700 tons respectively.

Boiler MACT (PDF) (5pp, 33 K): Boilers and process heaters are used at facilities such as refineries, chemical and manufacturing plants, and paper mills and may stand alone to provide heat for shopping malls and university heating systems. Boilers burn coal and other substances to produce steam which is then used to produce electricity or provide heat. Process heaters heat raw or intermediate materials during an industrial process. EPA estimates the rule will apply to 58,000 existing boilers and process heaters as well as the 800 new boilers and process heaters that will be built each year over the next five years. The boiler MACT rule substantially reduces these facilities emissions of a number of toxic air pollutants including hydrogen chloride, manganese, lead, arsenic and mercury. EPA estimates total annual air toxic reductions of over 50,600 tons per year in the fifth year after the rule takes effect. This final rule will further protect human health and the environment by reducing emissions of sulfur dioxide (SO2) and particulate matter (PM) in conjunction with the air toxic reductions. EPA estimates SO2 reductions between 49,000 - 113,000 tons per year and PM (measured as coarse particulate matter) reductions between 547,000 - 562,000 tons in the fifth year after promulgation.

To ensure that the public health benefits associated with two of these rules (Boiler and Plywood MACTs) are achieved in the most cost-effective way possible, EPA is providing alternative compliance options in certain cases where the risks posed by the emissions are very small. To qualify for these alternative approaches, the industrial source in question would have to demonstrate that the risks are small. Facilities that qualify for the alternative compliance options must assume federally enforceable emissions limitations. These limits ensure that their air toxics emissions do not exceed levels used to qualify for the compliance alternative.

Proposed MACTs
Electric Utility (PDF) (102pp, 580 K)

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