Lump-sum earthwork with no quantities
One price for "site work" hides how much is cut, filled, imported, and hauled off. Extras are counted by the truckload, and loosened soil swells roughly 20–30%, so truck yards overstate the work.
Earthwork priced with stated cut and fill quantities in bank cubic yards, with fixed unit prices for import, export, and over-excavation. Aggregates ticketed by the ton.
Scale tickets for every load of stone. A 100 × 200 ft arena with a 6 in compacted stone base needs roughly 700 tons.