On September 11, 2022, Zavannah LLC (an oil and gas exploration and production company focused on the Williston Basin in North Dakota) reported that an underground produced water pipeline attached to its Bobcat wellhead developed a leak and discharged approximately 9600 barrels of produced water into the soil. This material surfaced and flowed down a short ephemeral drainage and entered Stony Creek. Stony Creek is a tributary of the Missouri River.
EPA mobilized an On-Scene Coordinator to the Site on September 12, 2022.
Safety Message
The incident resulted in a fish kill. Chlorides and salinity are the main contaminants of concern.
Site Objectives
Savannah LLC immediately shut down the pipeline and isolated the impacted waterway.
The State of North Dakota is the lead Agency for the remediation effort. The goals of this effort as of September 13, 2022, when EPA's On-Scene Coordinator demobilized were to:
- Maintain containment of the isolated waterway.
- Conduct sampling to determine the nature and extent of contamination.
- Remove and dispose of impacted soil and water pending sampling results.
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