What facilities are asked to do an AERA?
• Facilities going through the Environmental Assessment Worksheet (EAW) or Environmental Impact Statement (EIS) processes because the proposed project was identified as being one of the mandatory environmental review categories in Minn. R. 4410.4300, subp 15. or Minn. R. 4410.4400 and construction of the project increases air emissions of a single criteria pollutant by 250 tons per year or more after the use of control equipment. • The MPCA may also direct a project proposer or facility owner to conduct an AERA when: • Substantive comments are received during a public comment period for an air emissions facility permit that might be resolved through the AERA process. In this instance, the permit may be issued containing the requirement to conduct the analysis, rather than delaying permit issuance until an AERA is completed; • The permittee is applying for a “flexible air permit” where a facility owner is seeking pre-authorized changes to a facility such that toxic emissions may be allo
