Fore this requirement, the contractor shall inspect, test, clean, repair, and maintain oil/water separator (OWS) systems, grit chambers, grease traps and collect/dispose of used vegetable cooking oil ... Fore this requirement, the contractor shall inspect, test, clean, repair, and maintain oil/water separator (OWS) systems, grit chambers, grease traps and collect/dispose of used vegetable cooking oil at Grand Forks Air Force Base (GFAFB), North Dakota. Additionally the contractor shall mow/till/monitor and sample the Land Treatment Facility during the growing season (June-Sept). Please see the Combo and Attachments for more details and submission requirements.