NORTHWEST NATURAL GAS CO

Incident Narrative

AT APPROXIMATELY 8:51AM ON OCTOBER 19, 2016 NW NATURAL RECEIVED NOTIFICATION OF DAMAGE TO A 1"" SERVICE LINE AT NW 23RD AVENUE AND GLISAN STREET IN PORTLAND. THE SERVICE WAS DAMAGED BY LOY CLARK DURING THE COURSE OF THEIR EXCAVATION FOR A THIRD PARTY. THE NATURAL GAS IGNITED AT 9:38AM RESULTING IN THE LOSS OF A STRUCTURE AT 500/510 NW 23RD AVENUE. A NW NATURAL FIRST RESPONDER ARRIVED ON SITE AT 9:10AM. GAS WAS CONTROLLED AT 9:52AM BY CLOSING A 2-INCH VALVE LOCATED AT THE INTERSECTION OF NW 22ND AVENUE AND NW GLISAN STREET. GAS SERVICE WAS INTERRUPTED TO 126 CUSTOMERS. ALL COSTS REPORTED IN PART D ARE PRELIMINARY ESTIMATES AND WILL BE UPDATED ON SUPPLEMENTAL REPORTS. HISTORICAL PERSPECTIVE: ON JULY 12TH 2016, A LOCATE REQUEST (TICKET 16173103) FOR INSTALLING ELECTRIC PRIMARY AND SERVICE WAS CALLED IN BY LOY CLARK AND, WAS ACCURATELY MARKED BY LOCATING INC. FOR THE AREA WHERE LOY CLARK WAS EXCAVATING ON OCTOBER 19TH, 2016. MARKS FROM THIS TICKET WERE STILL VISIBLE AND ACCURATE. ON SEPTEMBER 12TH, 2016, A LOCATE REQUEST FOR REPLACING TELEPHONE AND CABLE TV MAINLINE WAS CALLED IN BY LOY CLARK. THE LOCATE DESCRIPTION FOR THIS REQUEST WAS CLOSE TO, BUT DID NOT COVER, THE AREA WHERE LOY CLARK WAS EXCAVATING ON OCTOBER 19TH, 2016. LOCATE TICKET NUMBER 16229204. ON OCTOBER 19TH, 2016, DURING THE COURSE OF EXCAVATION ON PART OF THE SIDEWALK ON NW GLISAN WITHIN THE AREA COVERED BY THE JULY 12TH, 2016 LOCATE, AN EMPLOYEE WITH LOY CLARK PIPELINE HIT THE GAS SERVICE TO 500 NW 23RD WITH A BACK HOE CAUSING THE SERVICE LINE TO BE PULLED OUT OF AND SEPARATED FROM THE FITTING OF THE DRESSER VALVE. THE OPERATOR DID NOT EMPLOY HAND TOOLS OR OTHER NON-INVASIVE METHODS TO DETERMINE THE EXACT LOCATION OF THE UNDERGROUND SERVICE. LOY CLARK REPORTED THEY WERE PERFORMING COMMUNICATION WORK ON OCTOBER 19TH, 2016. THE LOY CLARK EMPLOYEES WERE DIGGING OUTSIDE OF THE LOCATE AREA THAT HAD BEEN CALLED IN BY LOY CLARK FOR COMMUNICATIONS WORK (LOCATE TICKET NUMBER 16229204).