A coalition of environmental groups are calling on local officials and regulators to shutter two controversial dump sites that have long operated in the Napa Valley hills near Calistoga. “We are a growing list of nonprofits that are asking for Clover Flat Landfill and Upper Valley Disposal Service to be decommissioned,” said the letter to the regional California Water Board, Napa County Board of Supervisors and Upper Valley Waste Management Agency, the oversight body for Napa County waste services. The group called for operations to be moved “to a safer, less environmentally sensitive location than the current CalFire High Fire Severity Zone at the top of the Napa River watershed.”