Test results confirm that a petroleum substance was spilled into the Flint River on June 29. Based on the limited amount of material found in the storm sewer system, the City of Flint believes that approximately 10 gallons were released into the river, contrary to the initial estimate of 200-300 gallons. After investigating the storm sewer line, the City of Flint has concluded that the spill originated near Dort Hwy, was a one-time discharge, and has stopped.
On June 30, 2023 samples were collected at three locations along the storm sewer pipe and analyzed for Oil & Grease, Total Volatile Toxic Organics (VTOs), Gasoline-Range Organics (GRO), Diesel-Range Organics (DRO), and Oil-Range Organics (ORO). The samples were picked up by a contract lab on July 5, 2023. Results show trace amounts of Oil & Grease and VTOs. GRO was not detected. DRO and ORO were found in the samples collected, confirming that it was a petroleum spill.
On June 29, booms were placed in the Flint River around the storm sewer outfall near the Utah Ave. bridge. Since then, the booms have been continuously maintained to absorb any discharge in the river. The City of Flint believes that residue at the outfall has been completely absorbed but plans to leave the booms in place until Monday, July 24 as a precautionary measure. When the cleanup is determined to be complete, the City of Flint will lift its recommendation to avoid contact with the Flint River near the Utah Ave. bridge.
