• District Rule 4702
    Internal Combustion Engines

Summary of Rule Amendment Efforts

Rule 4702 controls emissions from internal combustion (IC) engines rated at 25 bhp or greater used in the Valley at facilities such as, but not limited to, oil and gas production facilities, agricultural operations, petroleum refineries, and water districts.  Under Rule 4702, IC engine operators are required to submit the number of engines at the stationary source, perform extensive monitoring and record keeping through the implementation of an Inspection and Monitoring plan, submit an Emission Control Plan, and meet emission limits/standards and compliance schedules. 

Through commitments from the District’s 2018 PM2.5 Plan, the District is exploring potential amendments to Rule 4702 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 IC engines to the extent that such controls are technologically and economically feasible.  As a part of the District’s expedited Best Available Retrofit Control Technology (BARCT) review schedule, this rule development effort will also include an evaluation of feasible VOC emission limits for IC engines. 

District Contact

Proposed Rule Amendments

Date Document Available Materials
July 20th, 2021 Proposed Rule

Notice of Public Hearing Proposed Rule 

Rule 4702 Draft Staff Report Appendix B - Emissions Reduction Analysis Appendix C - Cost Effectiveness Analysis Appendix D - Socioeconomic Impact Analysis Appendix E - Rule Consistency Analysis Appendix F - RACT and BARCT Analysis

June 28th, 2021 Draft Rule

Draft Rule Public Notice

December 29th, 2020 Draft Rule Documents Available for Review Rule Amendment Public Notice

Recent and Upcoming Public Meetings

Date & Time Notice Materials
Thursday, August 19, 2021 at 9:00 AM Notice of Public Hearing


Board Item

Final Rule

Monday, June 28th, 2021 at 5:00 PM Notice of Public Workshop Presentation
Thursday, November 19th, 2020 at 4:00 PM Notice of Public Workshop Presentation
Thursday, September 24th, 2020 at 4:00 PM Notice of Public Workshop Presentation
Thursday, December 5th, 2019 at 2:00 PM Notice of Public Scoping Meeting Presentation