Mealey's (May 16, 2016, 12:08 PM EDT) -- SAN FRANCISCO — The Ninth Circuit U.S. Court of Appeals on May 13 affirmed that an umbrella insurer must reimburse two other insurers for an insured’s defense costs of approximately $2.1 million in addition to paying prejudgment interest on the defense costs incurred by the insured as a result of environmental contamination claims filed against the insured (Northwest Pipe Co. f/k/a Northwest Pipe and Casing Co. v. RLI Insurance Company of Wausau, No. 14-35542, 9th Cir.; 2016 U.S. App. LEXIS 8837)....