Marine Corps Air Station, Installation, Logistics and Environmental Department has a requirement to replace Backflow Preventers to comply with Arizona Department of Environmental Quality (ADEQ) cross-... Marine Corps Air Station, Installation, Logistics and Environmental Department has a requirement to replace Backflow Preventers to comply with Arizona Department of Environmental Quality (ADEQ) cross-connection-control and backflow-prevention requirements under Arizona Administrative Code R18-4-215. The contractor shall provide backflow-prevention assemblies see Exhibit A for required items. All items must be Brand Name or Equal to required items in Exhibit A. See all attached documents.