West Orange ridge sand and Seminole flatwoods set two different depth limits
Along the Central Florida Ridge in west and northwest Orange County, USDA-NRCS classes the Candler series as a hyperthermic, uncoated Lamellic Quartzipsamment: over 95 percent sand in the upper 40 inches and a water table below 80 inches, with the adjacent Tavares series at 42 to 72 inches. Nothing there stops a wheel, and a 24-inch grind for a pool deck is available in any month.
East and south of the ridge the flatwoods run on Myakka fine sand, Florida's state soil since 1989 and the most extensive in the state. Its NRCS description puts the seasonal high water table under 18 inches for one to four months a year, so a routine 8 to 12 inch plant-ready grind can reach water in the wet season and a wheeled machine ruts saturated fine sand. Quartz is harder than the carbide cutting it, and un-compacted sandy backfill settles several inches over the first rainy season.