Notes and Information. 90th Percentile Hrs represents the hours from cutoff to availability in which 90% of the units arrived by during the past 60 days. At terminals utilizing the Gate Reservation System, cutoff is based on the associated gate reservation. Holiday schedules and times may vary. Scheduled Available Time also referred to as Van Grounding Time. View Union Pacific's Highest Elevation Map for Intermodal Customers. Ramp Service Matrix.