Subsector 237 – Heavy and Civil Engineering Construction
237110
 Water and Sewer Line and Related Structures Construction
237120
 Oil and Gas Pipeline and Related Structures Construction
237130
 Power and Communication Line and Related Structures Construction
237210
 Land Subdivision
237310
 Highway, Street, and Bridge Construction
237990
 Other Heavy and Civil Engineering Construction
Except,  Dredging and Surface Cleanup Activities