Programs for Nonattainment Areas 



New sources or modifications which locate in nonattainment areas are subject 

 to the Growth Offset REgulation, Best Available Control Technology, and 

 Lowest Achievable Emission Rates. BACT is required for sources for those 

 pollutants which are not the cause of the nonattainment designation. In 

 addition LAER is required for those pollutants for which the source has a 

 potential to emit 100 tons per year or more of any regulated pollutant for 

 which an area is designated nonattainment (Department of Environmental 

 Protection 1979). 



The combination of proposed emissions must comply with the Growth Offset 

 Regulation. This regulation insures that ambient air quality standards will 

 be maintained and details how additional emissions will be permitted in 

 areas where standards are now in violation or in which the increment has been 

 exceeded. The regulation requires that ... 



Any air contaminant source . . .must . . .obtain an air quality 

 impact reduction (offset) from existing sources whose emissions of 

 the same pollutant effects the same area as the proposed source. 

 Sufficient offset must be obtained to insure the applicable ambient 

 air quality standard an/or the applicable PSD increment is maintained, 

 except in those instances where no SIP has been developed to demon- 

 strate compliance. In such cases the proposed source must demonstrate 

 progress toward attaining the standard by providing for reductions 

 in impacts from existing sources in excess of the new source impacts 

 (Department of Environmental Protection: 158) . 



The Growth Offset Regulation will in effect control additional air pollution 

 in areas which are nonattainment so that the ambient air quality standards 

 are maintained. In areas of violation, the Growth Offset Regulation will 

 insure progress toward attaining the standards. 



In general, the Growth Offset Regulation applies to the following areas in 

 coastal Maine (Department of Environmetal Protection 1979) : 



(1) All new major emitting sources of particulate matter proposed for 

 the municiaplities of Bangor, Brewer, Augusta, and Thomaston. 



(2) All new sources emitting 1000 tons per year of carbon monoxide 

 in Bangor. 



(3) An air contaminant source emitting more than 100 tons per year of 

 any pollutant for which there is an ambient air quality standard 

 and which emissions take place in an area where the PSD increment 

 has been consumed. 



(4) All major emitting sources emitting more than 100 tons per year 



of compounds in the Metropolitan Portland Region and Central Maine 

 (Androscoggin) Air Quality Control Region. 



3-C-9 



10-80 



