On Monday, January 8, 2018, a contractor collecting soil boring samples in the parking lot area to the west of Lifetime Fitness on Thomas Center Drive struck and damaged a 12-inch underground gasoline pipeline. The pipeline is operated by Magellan Midstream Partners.
The city of Eagan quickly responded to the public safety issues greatly minimizing the potential impact of the release. The Minnesota Pollution Control Agency's (MPCA) emergency response program worked with the city and provided oversight and direction to Magellan's cleanup response.
The damaged pipeline was shut down by Magellan quickly. Due to the pressure in the pipeline and draining of the shutdown line, an estimated 10,500 gallons of gasoline was released. The spill affected the soil around and below the pipeline, the parking lot surface, street curb and gutters, storm sewers, and two stormwater ponds. Because of quick action by the city, gasoline did not reach Thomas Lake.
The initial response included the collection of approximately 37,000 gallons of combined gasoline, contaminated water and snow, and 67 truckloads of contaminated soil. The MPCA has continued working with the city and Magellan to oversee cleanup and monitoring.
Activities that are occurring
- The potential intrusion of gasoline vapors in a commercial building is being controlled and monitored.
- One nearby private well continues to be routinely sampled and no contamination has been found to date.
- Equipment to remove gasoline vapor from the soils under the parking lot near the pipeline continues to operate.
- As requested by the MPCA, an additional investigation event was conducted by Magellan April 17–20 that collected soil, groundwater, and soil vapor samples. Two additional ground water monitoring wells were also installed during the investigation event.
- The MPCA is reviewing a report submitted by Magellan on June 8 that documents the results of the additional investigation and provides recommendations for the path forward.
- Groundwater monitoring wells will be sampled monthly.
- Oil absorbing booms were installed in three nearby stormwater ponds to collect any residual gasoline. The ponds were inspected three times per week for evidence of residual gasoline and maintenance of the absorbent boom from February through May, during which time no evidence of residual gasoline was observed.
- On June 8, Magellan, with approval from the city of Eagan, determined the oil absorbing booms installed at the three nearby stormwater ponds could be removed and site inspections discontinued.
The Minnesota Office of Pipeline Safety (MnOPS) is investigating this incident. MnOPS enforces compliance with Gopher State one-call and pipeline safety regulations. Its findings will be forwarded to federal authorities once the investigation is completed. A final determination by United States Department of Transportation Pipeline and Hazardous Materials Safety Administration could take up to a year.
Periodic updates on the cleanup will be posted to this site, if conditions or information changes.
- For questions about the clean-up contact Ryan Stafne, Minnesota Pollution Control Agency, 651-757-2848
- For questions about the accident investigation contact Jon Wolfgram, Office of Pipeline Safety, 651-201-7234
- For questions about Thomas Lake or other Eagan lakes contact Eric Macbeth, city of Eagan Lake Water Quality, 651-675-5300
Last updated 6/26/2018