A parking lot fails in the 20 feet in front of the dock, not out in the stalls. A loaded trailer sets its landing gear down on two steel pads about the size of a dinner plate, and that point load travels straight through thin pavement into the subgrade. Build the approach 8 inches thick over ground that has been proved, and the same apron takes the same rigs for 30 years.
Ontario Concrete Pro was founded in 2020 by Victor Salgado, who spent 14 years on commercial slab crews around the Inland Empire before that, and he sets the pour sequence on every lot himself. Ontario carries more of this work than most cities its size, because the freight blocks either side of Jurupa Street and the ground ringing Ontario International Airport are yards first and buildings second.
Lots are built under a CSLB C-8 concrete license with liability insurance on every job, and thickness follows the Portland Cement Association guidance for the axle loads a site actually sees rather than a residential default. The work carries a written workmanship guarantee against defects in how it was built, handed over when the last phase is striped and opened.