3″-6″ thick mat slab foundation for a six-level (two below grade), 531-stall parking structure that Overaa built. We placed 5,339 CY of concrete for the foundation over a 24-hour period. This required 594 deliveries – one every 1.6 minutes with 66 mixer trucks. We self-performed the foundation and placing of all vertical concrete. Adjacent occupied buildings with a limited laydown area.