MAGELLAN PIPELINE COMPANY, LP

Incident Narrative

AT 0506 ON 01/25/2017, OPERATIONS CONTROL ISSUED A CODE RED FOR #4 12"" FROM MASON CITY, IOWA TO FARIBAULT, MINNESOTA BASED ON A SCADA INDICATED RELEASE. THE PIPELINE WAS ACTIVE AT THE TIME OF THE EVENT BUT THE CONTROLLER QUICKLY SHUTDOWN AND ISOLATED THE PIPELINE UPON INDICATION OF THE RELEASE. RESPONDERS LOCATED THE RELEASE ALONG THE PIPELINE RIGHT-OF-WAY AND UPON EXCAVATION DETERMINED THE RELEASE TO BE ASSOCIATED WITH MECHANICAL DAMAGE INCLUDING AN APPARENT DENT WITH GOUGING. METALLURGICAL ANALYSIS INDICATED THE FAILURE ORIGINATED IN AN AREA OF LATENT MECHANICAL DAMAGE. THE PIPE SAMPLE CONTAINED TWELVE SEPARATE GOUGE/DENTS THAT WERE CONSISTENT WITH IMPACTS FROM MECHANICAL WORK. SHEAR CRACKS FORMED DUE TO RE-ROUNDING OF THE PIPE INDENTATIONS FOLLOWING THE MECHANICAL DAMAGE IMPACTS. CONTAMINATED SOIL AND SNOW WERE REMOVED. LONG TERM SOIL REMEDIATION IS REQUIRED. THE STATE OF IOWA HAS CLOSED THIS SITE AND ISSUED A NO FURTHER ACTION LETTER. ESTIMATED FINAL COSTS AND VOLUME OF COMMODITY RECOVERED PREDICTED WITH REASONABLE CERTAINTY. APPROXIMATELY 3,073.12 CUBIC YARDS OF SOIL WAS REMEDIATED. SUPPLEMENTAL/FINAL: UPDATE PART A 11 (VOLUME RECOVERED) , PART D 8D (EMERGENCY RESPONSE COST) AND PART H (NARRATIVE).