U.S. REFINERY FILING — VALERO PORT ARTHUR REFINERY 10/15/2026 02:13 PM 11/20/2026 01:13 PM — EMISSIONS EVENT

U.s. Refinery Filing Valero Port Arthur Refinery (This item is an automated alert generated directly from a government database of environmental notices filed by energy companies. It may be followed by a news story depending on the severity of the incident's impact on operations.) Cause: The Fluid Catalytic Cracker Wet Gas Scrubber (FCCU WGS) stack test for particulate matter (PM), conducted on August 19, 2026, indicated results with emissions that exceeded the applicable limit during the test. As part of the stack test, the FCCU was temporarily operated outside of normal operating conditions to simulate potential worst-case operating scenarios and evaluate system performance under atypical conditions. These atypical operating parameters inadvertently contributed to increased PM emissions and the resulting test exceedance. Source 1:: Wet Gas Scrubber E-01-WGS Source 2:: Source 3:: Action taken: A subsequent PM stack test was conducted on the FCCU WGS on September 24, 2026. Preliminary results from this testing indicate particulate matter (PM) emissions are within applicable limits. Source: TCEQ, (North American power desks: Houston +1 713 210 8522, New York +646 223 6072, Bengaluru