CONSOLIDATED EDISON CO OF NEW YORK

Incident Narrative

ON MARCH 7, 2012 AT 09:55 A LEAK SURVEY CREW REPORTED A T-1 LEAK AT BRADHURST AVENUE AND STEVENS AVENUE, MT. PLEASANT, ALONG THE ROUTE OF THE TRANSMISSION MAIN AT THIS LOCATION AS PART OF A BASELINE SURVEY ASSOCIATED WITH THE PRESSURE REDUCTION TO HP RELATED TO THE LEAK AT 1060 KNOLLWOOD RD (TG) {SEE PHMSA REPORT 20120033-15480} ON THE 12"" 245 PSI TRANSMISSION MAIN. GAS CONSTRUCTION AND SUPERVISION WERE DISPATCHED IMMEDIATELY AND THE LEAK INVESTIGATION INDICATED A PROBABLE TRANSMISSION MAIN LEAK. AN OPERATIONAL PLAN WAS DEVELOPED AND UPON EXCAVATING OVER THE 12"" TRANSMISSION MAIN (AT 55 PSI) A COUPLING WAS FOUND LEAKING AT BOTH COMPRESSION ENDS AT 22:11 HRS. A WELDED REPAIR SLEEVE WAS INSTALLED OVER THE LEAKING COUPLING AND THE REPAIR WAS TESTED AND PASSED. TRANSMISSION PRESSURE WAS RESTORED INCREMENTALLY AND ON MARCH 8, 2012 AT 17:59 TRANSMISSION PRESSURE WAS FULLY RESTORED TO 231 PSI. GR-484 WAS RETURNED TO SERVICE. THE N.Y.S. PSC AND U.S. DOT WERE NOTIFIED. THERE WERE NO INJURIES OR EVACUATIONS ASSOCIATED WITH THIS EVENT. THIS WAS A SERIOUS LEVEL INCIDENT.