( March 18, 2025, 2:48 PM EDT) -- SAN FRANCISCO — An insurer on March 17 filed an opposition to a California Catholic diocese’s motion for leave to file an amicus curiae brief in an insured’s appeal in a groundwater contamination coverage suit, telling the Ninth Circuit U.S. Court of Appeals that the diocese should not be granted leave to file an amicus brief because the diocese’s arguments are not relevant to the contamination coverage dispute at issue....