at the st. george municipal airport, which kind of surface is used by the runway with the width less than or equal to 30.0?
(AND aviation.airport_runway_surface (JOIN aviation.airport_runway_surface.runways (AND (ge aviation.airport_runway.width 30.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN aviation.airport_runway.airport m.06pd3x))))