Summary of Rule Amendment Efforts
Rules 4352 controls emissions from boilers, steam generators, and boilers fired on a variety of solid fuels: coal, petroleum coke, biomass, tire-derived fuel, and municipal solid waste (MSW). Although the output from units subject to the rule could be utilized in many settings, all of the operators within the San Joaquin Valley use the output from the units to generate electricity. There are 7 units currently active in the Valley at 6 facilities. These units are fired exclusively on MSW or biomass.
Through commitments from the District’s 2018 PM2.5 Plan, the District is exploring potential amendments to Rule 4352 to further reduce NOx emissions from this source category. Given the need for additional reductions to meet the latest health-based federal air quality standards, the District has begun a regulatory amendment process in exploring potential opportunities to achieve additional NOx emissions reductions from boilers, steam generators, and process heaters fired on solid fuel to the extent that such controls are technologically and economically feasible.