Subsurface Structure
Subsurface Structure : A structure located belowground, such as a manhole, sewer, utility conduit, observation well, storm drain, vault, water line, fuel gas distribution system, electric light and power conduit, telephone and telegraph communication line, street-lighting conduit, police and fire signal system, traffic signal line, refrigeration service line, steam line, petroleum pipeline, subway, tunnel, or the substructural areas of a building, such as a basement or parking garage
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