Congressional District # 02
KOCH REFINING CO./N-REN CORP.EPA ID# MND000686071
Last Updated: December, 2012
The Koch Refining Company/N-Ren Corp. (Koch) site is an active oil refinery and covers 1,200 acres in the Pine Industrial District of Rosemount, Minnesota. The site includes the refinery and adjacent properties owned by Koch. The Great Northern Refining Company began refining oil on this site in 1955. In 1969, the refinery was sold to Koch, which expanded refining capacity from 25,000 barrels to 160,000 barrels per day. The refinery receives crude oil which is then refined into gasoline, jet fuel, heating oil, kerosene, diesel fuel, boiler fuel, asphalt, petroleum coke, sulfur, carbon dioxide, butane, and propane. Product spills had been recorded in the storage tank area on the site since the early 1970s. The State of Minnesota sampled water from six private wells near the refinery and found them to be contaminated with volatile organic compounds (VOCs). A section of gasoline pipeline, running from the tank farms to the barge dock on the Mississippi River, had corroded and was believed to be one of the sources of groundwater and soil contamination at the site. (The pipeline was subsequently replaced.) Drinking water for the employees on the site is obtained from deep bedrock production wells that are not contaminated.
Site ResponsibilityThis site is currently being addressed through responsible party actions and State-lead Resource Conservation and Recovery Act (RCRA), and Underground Storage Tank programs.
Threats and Contaminants
Groundwater contaminants included VOCs, polycyclic aromatic hydrocarbons (PAHs), phenols, and lead. Soil was also contaminated with VOCs that included benzene, toluene, and xylenes as well as PAHs. Production areas at the site are regulated under a variety of environmental statutes. Spill protection, RCRA waste management, effluent limitations for surface water discharge, and air emission controls are all environmental management matters which the operating plant continues to address under State oversight.
The United States Environmental Protection Agency (EPA) listed the site on the National Priorities List (NPL) in 1984. EPA conducted preliminary evaluations of the site conditions and determined that there were possible releases from the barge dock loading area although no immediate threat was posed to the surrounding communities or the environment. Under State supervision, Koch conducted an investigation into the nature and extent of soil contamination in the vadose zone at the site (the layer of subsurface water just above the groundwater table) and, in 1985, signed a Consent Agreement with the State for site cleanup. An interim Remedial Action Plan for product recovery was approved by the State in 1987. From 1988 to 2004, a soil gas bio-venting system operated at the site and a previously-leaking pipeline was replaced. In addition, two homes east of the refinery were supplied with bottled water. The site was transferred to management under the State's Resource Conservation and Recovery Act (RCRA) program and was deleted from the NPL in 1995.
Property ReuseThe site remains in active use an an oil refinery.
ContactsRemedial Project Manager, U.S. EPA
leah evison (email@example.com)
Community Involvement Coordinator, U.S. EPA
AliasesKOCH REF CO
KOCH REFINING COMPANY/N-REN CORPORATION