Proposed Amendments to the Best Available Control Technology (BACT) Guidelines

Amendments to the BACT Guidelines are proposed to the following sections to maintain consistency with recent changes to South Coast AQMD rules and state requirements and to include equipment and processes which have been achieved in practice. Overview Section The introduction has been updated to provide a more complete reference to the applicable regulatory requirements, and to update the agency responsible for managing the California Air Resources Board (CARB) Technology Clearinghouse Database from the California Air Pollution Control Officers Association’s Engineering Managers Committee to the CARB Technology Assessment Section. This section has also been reorganized and includes other administrative changes to improve clarity and consistency. Part A – Policy and Procedures for Major Polluting Facilities The references in Footnote 3 to Rule 1325 paragraphs (b)(12) and (b)(13) have been updated for consistency with the most recent version of the rule. Other administrative changes have been made for clarity and consistency. Part B – Lowest Achievable Emission Rate (LAER) /BACT Determinations for Major Polluting Facilities Section I – South Coast AQMD LAER/BACT Determinations has been revised to update one existing listing and add one new listing, as follows: a) Linear Generator, Non-Emergency Electrical Generator, Natural Gas Fired (update), and b) Lithographic Printing, Non-Heatset, Sheet-fed (new). Section III – Other LAER/BACT Determinations has been revised to add two new listings of other/emerging technologies that have been permitted and placed into operation but have not yet demonstrated sufficient performance to qualify as LAER, as follows: a) Boiler, Refinery Gas Fired, and b) Digester Gas (Biogas) Conditioning and Upgrading System. Part C – Policy and Procedures for Non-Major Polluting Facilities The Maximum Cost-Effectiveness Values in Table 5 have been updated for consistency with the second-quarter 2026 Marshall and Swift Equipment Cost Index in accordance with the BACT Guidelines policy. Figure 2 - The Ongoing BACT Update Process has been updated to include the Stationary Source Committee within the flow chart for consistency with the BACT Scientific Review Committee SRC Charter. Other updates to terminology have been made for consistency. Part D – BACT Determinations for Non-Major Polluting Facilities Emission limits for the Food Oven category have been updated for consistency with the current Phase I limits in Rule 1153.1, and a new listing of Linear Generator, Non-Emergency Electrical Generator, Natural Gas Fired has been added. Part E – Policy and Procedures for Facilities Subject to Prevention of Significant Deterioration for Greenhouse Gases Administrative amendments have been made to correct minor grammatical errors. The proposed project will benefit stakeholders by having the guidelines reflect the latest, feasible technology available and improved clarity and accuracy when implementing the applicable requirements.