Subsurface Constructors is a full service deep foundation and ground improvement contractor headquartered in St. Louis, MO. O ... ur team of geotechnical engineers, project managers and tradesmen specialize in geotechnical construction projects of all types. Our design capabilities and unique fleet of vibro rigs put us in a competitive position on stone column and aggregate pier projects all over the United States. Subsurface Constructors is a Veteran-Owned Small Business certified as Federal Government Contract-Ready. read more