The South Coast Air Quality Management District (SCAQMD) is proposing amendments to its Best Available Control Technology (BACT) guidelines. BACT has widespread effects for business in the South Coast Air Basin as it applies to new and modified sources for which emission increases may result of an ozone depleting compound or any nonattainment air contaminant. Many SCAQMD regulations apply BACT, including Regulation XIII, New Source Review, Regulation XX, RECLAIM, and Regulation XVIII, Prevention of Significant Deterioration (PSD). The new BACT guidelines now include policy and procedures for facilities subjected to PSD program for greenhouse gas (GHG) emission sources (still under development) and EPA recommended "top-down" BACT process. This top-down process includes 5 steps, from identifying available options, to eliminating infeasible options, ranking and determining the effectiveness, economic, energy, and environmental impacts of options, and finally selecting BACT.
The BACT guidelines for non-major polluting facilities (minor sources) have also been updated. Emission guidelines and thresholds for natural gas and propane fired boilers, and landfill and digester gas fired boilers will now be reported separately. Portable internal combustion (IC) engines are now subjected to Tier 4 emission control from 40 CFR Part 89. Stationary IC engines' NOx and non-methane hydrocarbon compounds (HNMC) emission control for compression ignition, fire pump with horsepower less than 750 HP also tightened from Tier 2 to Tier 3 based on 40 CFR Part 89. Emission guidelines for stationary, non-emergency, non-electrical generator are still under development. For more information regarding the updates, click here.