AB 617 requires California districts in nonattainment areas to adopt, by January 1, 2019, an expedited schedule to implement Best Available Retrofit Control Technology (BARCT) rules for industrial sources subject to Cap and Trade limits on greenhouse gas emissions. BARCT emission standards must be fully implemented no later than December 31, 2023. In establishing BARCT, the District will consider local public health and clean air benefits to the surrounding community, the cost-effectiveness of control options, and the air quality and attainment benefits. In Sacramento County, the anticipated sources subject to the expedited BARCT requirements may include hydrogen production and natural gas production/processing operations. Many types of equipment used in natural gas production, such as separators, compressors, condensate tanks, wellheads, and underground storage facilities, are not currently included in the District’s air quality permit system. By the end of 2018, the District plans to finish the permitting of this equipment, which will help us evaluate BARCT requirements for these sources.