The Alabama Department of Environmental Management (ADEM) is proposing to revise key definitions in Division 3 of the ADEM Administrative Code. Additionally, ADEM is proposing to incorporate by reference changes to several federal rules in Division 3 including New Source Performance Standards (NSPS) and National Emissions Standards for Hazardous Air Pollutants (NESHAP).

ADEM is proposing to revise the definition of greenhouse gases (GHG) and volatile organic compounds (VOC) for consistency with EPA's definition and to correct the definition of particulate matter (PM) as applicable to New Source Review (NSR) permitting. The definition of GHG is being revised to exclude biogenic carbon dioxide (CO2) emissions. Biogenic CO2 emissions do not have to be included in applicability determinations for Prevention of Significant Deterioration (PSD) and Title V permitting purposes until July 21, 2014. The definition of VOC is being revised to exclude trans-1,3,3,3-tetrafluoropropene (HFO-1234ze) due to the negligible contribution to tropospheric ozone formation of this compound.

Under the current definition of Regulated NSR Pollutant in Rule 335-3-14.04(2)(ww) of the ADEM Administrative Code, PM emissions as calculated for NSR applicability purposes must include gaseous emissions from a source or activity which condense to form particulate matter at ambient temperatures, or condensable PM (CPM). ADEM is proposing to revise this definition such that PM emissions as calculated for NSR applicability purposes will not include CPM. Note that PM2.5 and PM10 emissions, as calculated for NSR applicability purposes, must still include CPM.

At this time, ADEM is also proposing changes to the definition of a major emissions unit with respect to the PSD Plantwide Applicability Limit (PAL) regulations. ADEM is proposing to revise the definition of a major emissions unit to include any unit that has the potential-to-emit (PTE) of 100,000 tons of GHG as carbon dioxide equivalent (CO2e).

ADEM will hold a hearing on February 6, 2013 at 10:00 AM in Montgomery to discuss the proposed changes.