High-rise site: backup plan if service elevator is booked?
I'm running a 24-story build in downtown Phoenix with 140 crew on site for the next 10 months. We have six standard portable toilets and one ADA-compliant portable toilet on the 12th-floor podium deck. The rental company services them weekly with a vacuum truck that needs the service elevator. That elevator gets booked solid for concrete pours and material moves. I already had one missed service last month when the truck showed up and the elevator was down for two hours. The crew complained for days. What's the backup plan here? Do I push for a dedicated elevator slot, or is there another way to guarantee service?