Subbase

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1. Layer of soil beneath the topsoil of a sports field, or under a running track, bocce court or other surface; sometimes referred to as "subsoil."

field.jpg

This is the subbase of an athletic turf field being installed at the University of Vermont.
Source: http://www.uvm.edu/~arch/?Page=projects/turf_field.html&SM=currentprojectmenu.html