OTTAWA, Ill. - An insurer owes no coverage to an insured for an underlying environmental contamination claim arising out of a petroleum spill because the contamination did not occur during the applicable policy periods and the policies' petroleum exclusion precludes coverage, the Third District Illinois Appellate Court said Oct. 18 (National Farmers Union Property & Casualty Co. v. DeGroate Petroleum Service Inc., et al., No. 3-12-0917, Ill. App., 3rd Dist.; 2013 Ill. App. Unpub. LEXIS 2344).