Equitrans Midstream Provides Rager Mountain Storage Facility Update - Seite 2

Equitrans' Mitigation Activities:

Equitrans worked with various third-party experts to confirm that all causes and/or contributors to the November 2022 incident were identified and addressed. The damaged casing on well #2244 has been replaced, and the well remains temporarily plugged. It has not yet been determined whether the well will be permanently plugged or returned to service.

Additionally, several other Rager wells have undergone top joint casing replacements to proactively address less-aggressive corrosion that was identified. Equitrans has also performed supplemental evaluation and testing, including updated wireline logging, on all other wells at the Rager Mountain facility, which is expected to allow the field to return to service, subject to PHMSA authorization.

Existing wireline reports for more than 180 wells at Equitrans' other storage fields have been reprocessed using the updated algorithm technology. Additionally, Equitrans has accelerated its overall wireline program and is expected to complete updated logging of approximately 100 wells in 2023. Furthermore, Equitrans is modifying its gelling requirements to provide inhibitor protection to wells that may be at risk of corrosion due to the presence of water or oxygen. Finally, as a means of additional future risk mitigation, Equitrans is completing a comprehensive review of its SIMP and related practices.

To address potential concerns related to the roughly 0.127 Bcf of migrated gas, Equitrans completed extensive field and laboratory soil and water well testing, which confirmed that no gas migrated to nearby residential areas.

With roughly 300 storage wells located across 18 storage fields, Equitrans remains focused on the timely completion of the work identified during the post-incident investigation as necessary and/or beneficial for the safe and environmentally responsible operation of its Rager Mountain facility and other storage fields. Equitrans continues to coordinate with PHMSA and other regulators in connection with their ongoing investigations of the incident.

About Equitrans Midstream Corporation

Equitrans Midstream Corporation has a premier asset footprint in the Appalachian Basin and, as the parent company of EQM Midstream Partners, is one of the largest natural gas gatherers in the United States. Through its strategically located infrastructure assets in the Marcellus and Utica regions, Equitrans has an operational focus on gas transmission and storage systems, gas gathering systems, and water services that support natural gas development and production across the Basin. With a rich 140-year history in the energy industry, Equitrans was launched as a standalone company in 2018 with a vision to be the premier midstream services provider in North America. While working to meet America's growing need for clean-burning energy, Equitrans is proud of its environmental, social, and governance (ESG) practices, striving every day to preserve and protect the environment, provide an engaging workplace for its employees, support and enrich its local communities, and to deliver sustained value for customers and shareholders. Visit www.equitransmidstream.com; and to learn more about our ESG practices visit Equitrans Sustainability Reporting.