Mealey's (November 19, 2019, 1:06 PM EST) -- WAUSAU, Wis. — The Third District Wisconsin Court of Appeals on Nov. 19 remanded a trial court’s ruling in an environmental contamination coverage dispute on the meaning of occurrence used in three excess policies after determining that the term occurrence is ambiguous and that an insured has to prove only that “one event” caused the damage at issue (Superior Water, Light and Power Co. v. Certain Underwriters at Lloyds, London et al., No. 2018AP1926, Wis. App., Dist. 3, 2019 Wisc. App. LEXIS 617)....