Constructing artificial nest sites for ground nesting native bees

I report a large-scale experiment to provide artificial nesting sites for native, wild bees in a location where they did not already live.  400 tons of commercially available sand was shaped into dunes, and inoculated with native bees caught 20km away. In a few days, more than 2,000 free flying bees colonized the dunes.  The experiment demonstrates that it is possible to use ordinary construction methods to produce favorable wild bee nesting habitat.