EQUISTAR CHEMICALS, L.P. — Integrity Assurance Notification

REPAIROn April 28, 2023, a Quest ultrasonic combo tool was ran on EPO’s System 88 6” ACC POSM to Deer Park Styrene line. The final report was received on and reviewed on June 28, 2023, making this the date of discovery. In the report, a 17% metal loss anomaly on the long seam was found. This anomaly meets the criteria of a 180-day condition per 49 CFR 195.452(h)(4)(iii)(H). 180 days after June 28, 2023, is December 25, 2023. The location of the anomaly was found to be under the Buffalo Bayou (Latitude: 29°45'17.26"N Longitude: 95° 5'44.56"W), making it impractical to repair or make a determination about the exact condition of the anomaly. 49 CFR 195.452(h)(2) states that an operator must notify PHMSA in this scenario.#