PSC Z1LC Maintenance of Tunnels and Subsurface Structures

Services
Federal Category 4.4: Facilities & Construction Facility Related Services

Possible NAICS Codes
237990 – Other Heavy and Civil Engineering Construction
236220 – Commercial and Institutional Building Construction
561990 – All Other Support Services
237310 – Highway, Street, and Bridge Construction
237110 – Water and Sewer Line and Related Structures Construction
238990 – All Other Specialty Trade Contractors
541990 – All Other Professional, Scientific, and Technical Services
562910 – Remediation Services
237130 – Power and Communication Line and Related Structures Construction
562998 – All Other Miscellaneous Waste Management Services