CENTURION PIPELINE L.P.

Incident Narrative

ON OCTOBER 1, 2018, AT APPROXIMATELY 11:25 AM, A CENTURION PIPELINE L.P. (CPL) EMPLOYEE IDENTIFIED A LEAK AT POST STATION NEAR POST, TEXAS, IN GARZA COUNTY, TEXAS. CPL IMMEDIATELY SHUT DOWN THE STATION AND SECURED THE RELEASE. AFTER EXCAVATION, CPL DETERMINED THE SOURCE OF CRUDE OIL TO BE THE 6'' PRESSURE RELIEF LINE. CPL INSTALLED A BOLT-ON REPAIR SLEEVE AND RESTARTED THE STATION AT 4:40 PM ON OCTOBER 1, 2018. APPROXIMATELY 114.8 BARRELS OF CRUDE OIL WERE RELEASED WITHIN THE CPL-CONTROLLED STATION; HOWEVER, THE CRUDE OIL FLOWED OUT OF THE STATION AND INTO AN ADJACENT EPHEMERAL CREEK BED. CPL IMMEDIATELY REMEDIATED THE EPHEMERAL CREEK BED, AND REMEDIATION EFFORTS TO REMOVE THE CRUDE OIL FROM THE STATION SOIL REMAIN ONGOING. NO INJURIES, FATALITIES, OR FIRES WERE ASSOCIATED WITH THIS ACCIDENT. THE NATIONAL RESPONSE CENTER (NRC) REPORT NUMBERS CORRESPONDING TO THE UPDATES CONCERNING THIS ACCIDENT ARE 1226230 AND 1226389. AT THE TIME OF THIS SUBMITTAL, THE ROOT CAUSE ANALYSIS OF THE FAILURE HAS NOT YET BEEN COMPLETED. FOR THE PURPOSE OF SUBMITTING THIS ORIGINAL ACCIDENT REPORT, CPL SELECTED ""CORROSION FAILURE"" AND A SUB-CAUSE OF ""INTERNAL CORROSION."" HOWEVER, CPL WILL REMOVE THE FAILED SECTION OF PIPE FOR FURTHER ANALYSIS AND WILL SUBMIT A SUPPLEMENTAL REPORT CONTAINING THE RESULTS OF THE FAILURE INVESTIGATION ONCE COMPLETED. THE SUPPLEMENTAL REPORT WILL ALSO CONTAIN THE AMOUNT OF OIL RECOVERED DURING CONTINUED REMEDIATION, THE REMAINING COST ACCRUALS ASSOCIATED WITH THIS ACCIDENT, AND ANY NECESSARY PREVENTATIVE MAINTENANCE MEASURES. SUPPLEMENTAL FINAL REPORT FILED ON DECEMBER 18, 2018: THE FOLLOWING UPDATES ARE INCLUDED IN THIS SUPPLEMENTAL/FINAL REPORT: 1. THE VOLUME OF COMMODITY RECOVERED IN QUESTION A11 IS UPDATED TO REFLECT THE COMPLETED REMEDIATION EFFORTS. ALL PRODUCT HAS BEEN RECOVERED FROM THE ENVIRONMENT. 2. DURING THE ROOT CAUSE ANALYSIS, CPL DETERMINED THAT THE APPARENT CAUSE OF FAILURE IS INTERNAL CORROSION. QUESTION C6 IS UPDATED TO DESCRIBE THE TYPE OF ACCIDENT AS A LEAK DUE TO A THROUGH-WALL PIT AS A RESULT OF MICROBIOLOGICALLY INDUCED CORROSION (MIC). 3. THE REMAINING COST ACCRUALS AND ADJUSTMENTS ARE ACCOUNTED FOR IN QUESTION D8. 4. DURING THE INTERNAL PIPE INSPECTION OF THE FAILURE, CPL IDENTIFIED LOCALIZED PITTING AND DETERMINED THE PIT MORPHOLOGY IS INDICATIVE OF MIC. QUESTION G1-6 IS UPDATED TO REFLECT THE IDENTIFICATION OF LOCALIZED PITTING, AND QUESTION G1-7 IS UPDATED TO INCLUDE MICROBIOLOGICAL AS THE TYPE OF CORROSION RELATED TO THIS ACCIDENT. IN ORDER TO PREVENT SIMILAR ACCIDENTS FROM OCCURRING, CPL REPLACED THE RELIEF LINE WITH INTERNALLY COATED PIPE. ALL REPAIRS AND REMEDIATION RELATED TO THIS ACCIDENT ARE COMPLETE.