Mealey's (October 4, 2017, 1:32 PM EDT) -- PHILADELPHIA — A commercial general liability insurer did not breach its insurance contract nor did it act in bad faith in denying a claim, a Pennsylvania federal judge ruled Sept. 29 because “deleterious substances” exclusion precluded coverage for grout dust from construction work that led to property damage (Collin R. Ginther v. Preferred Contractors Insurance Company Risk Retention Group LLC, No. 16-686, E.D. Pa., 2017 U.S. Dist. LEXIS 161720)....