MONUMENT PIPELINE, LP — Gas transmission and gathering — incident on 2018-05-26

Gas transmission and gathering incident in PEARLAND, BRAZORIA County, TX. Reported cause: EXCAVATION DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 20017.851 NATURAL GAS released, $175,000 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: 20180066.

Operator ID: 32231.

Reported incident date: 5/26/2018 21:00.

Location detail: 80642.72 FT

Cause detail: EXCAVATION DAMAGE BY THIRD PARTY

Cause detail: MISCELLANEOUS ROOT CAUSES

Cause detail: ROOT CAUSE NOT LISTED (COMMENT REQUIRED)

Cause detail: DURING A SEVERE THUNDERSTORM, MONUMENT'S PRIMARY DELIVERY CUSTOMER LOST POWER TO THEIR FACILITY AND SHUT IN THE METER. DURING THE RESULTING PRESSURE BUILD-UP, THE PIPELINE RUPTURED. THE PIPELINE RUPTURE OCCURRED AT A RECENT EXCAVATION LOCATION WHERE A STORM WATER LINE, SEWER LINE, AND NEW DRIVEWAY WERE INSTALLED. UPON DISCOVERY, THE RUPTURED PIPELINE SECTION WAS ISOLATED BETWEEN TWO MAINLINE VALVES AND THE PRESSURE BLED DOWN TO 0 PSI. THE PIPELINE REPAIR WAS COMPLETED AND THE PIPELINE RETURNED TO SERVICE ON 5/30/2018. FINAL REPORT FINAL DETERMINATION BASED ON COMPLETION OF METALLURGICAL ANALYSIS WAS MECHANICAL DAMAGE CONSISTENT WITH THIRD PARTY EXCAVATION EQUIPMENT.

PHMSA trend classification: significant incident, not serious.

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

PHMSA indexed costs: $447,500 reported total cost, $241,132.894 in 1984 dollars, $524,649.804 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.