The Billings Gazette reports:

The insurance policy for a medical research company's laboratory in Hamilton does not cover pollution caused by years of dumping hazardous waste into [the Bitterroot Valley Sanitary Landfill] nearby, the Montana Supreme Court said Tuesday.

The unanimous decision rejected claims by Corixa Corp., formerly Ribi Immunochem Research Inc., that it deserved coverage because the resulting contamination of groundwater was unexpected and unintentional. The court said the waste dumping was intentional, and therefore, Corixa's insurance policy did not apply.

TCE, PCE, and vinyl chloride are among the contaminants of concern at the site. You can read the full story here.

For more detail on the contamination, the Montana Department of Environmental Quality (DEQ) has a full summary of findings and remediation strategy at the landfill in their Record of Decision (ROD).