ENABLE OKLAHOMA INTRASTATE TRANSMISSION, LLC — Gas transmission and gathering — incident on 2018-10-22

Gas transmission and gathering incident in OKLAHOMA CITY, CLEVELAND County, OK. Reported cause: EXCAVATION DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 5100 NATURAL GAS released, $90,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20180115.

Operator ID: 26330.

Reported incident date: 10/22/2018 8:25.

Location detail: 78+08

Cause detail: EXCAVATION DAMAGE BY THIRD PARTY

Cause detail: MISCELLANEOUS ROOT CAUSES

Cause detail: ROOT CAUSE NOT LISTED (COMMENT REQUIRED)

Cause detail: LINE 106B WAS STRUCK ON 10/22/18 BY A DOZER PERFORMING WATER REMEDIATION ACTIVITIES IN CLEVELAND COUNTY, OKLAHOMA. THE DAMAGE OCCURRED IN THE MIDDLE OF A SAND/DIRT PIT RIGHT NEXT TO A LARGE POND THAT WAS FLOODED WITH UP TO 24" OF WATER. THE BULLDOZER WAS OWNED AND OPERATED BY BUTLER BROS. SAND WHO ALSO OWNED THE LAND. BUTLER BROS. WAS TRYING TO DRAIN THE AREA BY LEAVING TRACK RUTS IN THE WET MUD, ALLOWING A PATH FOR THE WATER TO DRAIN TO NEARBY RUN OFF AREAS. AS THE DOZER WAS CROSSING A BERM NEAR AN EXPOSED SECTION OF L-106B (WHICH WAS ALL UNDERWATER, BUT IDENTIFIED WITH PIPELINE MARKERS). THE SATURATED BERM COLLAPSED UNDER THE WEIGHT OF THE DOZER. THE DOZER SLID DOWN THE EDGE OF THE BERM EMBANKMENT INTO THE EXPOSED SECTION OF LINE CREATING DAMAGE TO THE PIPE AND CAUSING IT TO LEAK GAS. ENABLE GAS CONTROL WAS NOTIFIED IMMEDIATELY AND INITIATED SHUT-IN FOR THAT SECTION OF L-106B. ENABLE O&M REPRESENTATIVES ARRIVED SHORTLY THEREAFTER TO CONTINUE TO ASSESS THE SITUATION AND CLOSE THE UPSTREAM VALVE. THE AREA WAS DRAINED AND THE PIPE WAS EVALUATED. IT WAS CONFIRMED THE DAMAGED PIPE WAS LOCATED IN AN OPEN SPAN THAT AT THE TIME OF THE INCIDENT WAS ALL UNDERWATER. THE OPEN SPAN WAS NEAR A ROAD AND WAS IDENTIFIED WITH SIGNAGE AT THE BEGINNING AND END OF THE EXPOSURE. DURING REPLACEMENT, A DECISION WAS MADE TO INCREASE THE DEPTH OF THE PIPELINE ELIMINATING THE EXPOSURE AND REDUCING THE CHANCE FOR LINE STRIKES IN THE FUTURE. THE LINE WAS RETURNED TO SERVICE ON 11/1/2018. A CALL WAS PLACED TO THE NRC ON 10/22/18 AT 10:37 (NRC#1228144) AND A 48 HOUR FOLLOW UP WAS PROVIDED ON 10/24/18 AT 09:30 (NRC #1228370).

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EXCAVATION DAMAGE — THIRD PARTY EXCAVATION DAMAGE.

PHMSA indexed costs: $108,368 reported total cost, $58,547.76 in 1984 dollars, $127,040.749 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.