| PSC | Description
|
| Y1AA | Construction Of Office Buildings |
| Y1AB | Construction Of Conference Space and Facilities |
| Y1AZ | Construction Of Other Administrative Facilities and Service Buildings |
| Y1BA | Construction Of Air Traffic Control Towers |
| Y1BB | Construction Of Air Traffic Control Training Facilities |
| Y1BC | Construction Of Radar and Navigational Facilities |
| Y1BD | Construction Of Airport Runways and Taxiways |
| Y1BE | Construction Of Airport Terminals |
| Y1BF | Construction Of Missile System Facilities |
| Y1BG | Construction Of Electronic and Communications Facilities |
| Y1BZ | Construction Of Other Airfield Structures |
| Y1CA | Construction Of Schools |
| Y1CZ | Construction Of Other Educational Buildings |
| Y1DA | Construction Of Hospitals and Infirmaries |
| Y1DB | Construction Of Laboratories and Clinics |
| Y1DZ | Construction Of Other Hospital Buildings |
| Y1EA | Construction Of Ammunition Facilities |
| Y1EB | Construction Of Maintenance Buildings |
| Y1EC | Construction Of Production Buildings |
| Y1ED | Construction Of Ship Construction and Repair Facilities |
| Y1EE | Construction Of Tank Automotive Facilities |
| Y1EZ | Construction Of Other Industrial Buildings |
| Y1FA | Construction Of Family Housing Facilities |
| Y1FB | Construction Of Recreational Buildings |
| Y1FC | Construction Of Troop Housing Facilities |
| Y1FD | Construction Of Dining Facilities |
| Y1FE | Construction Of Religious Facilities |
| Y1FF | Construction Of Penal Facilities |
| Y1FZ | Construction Of Other Residential Buildings |
| Y1GA | Construction Of Ammunition Storage Buildings |
| Y1GB | Construction Of Food Or Grain Storage Buildings |
| Y1GC | Construction Of Fuel Storage Buildings |
| Y1GD | Construction Of Open Storage Facilities |
| Y1GZ | Construction Of Other Warehouse Buildings |
| Y1HA | Construction Of Government-owned Contractor-operated (goco) R&d Facilities |
| Y1HB | Construction Of Government-owned Government-operated (gogo) R&d Facilities |
| Y1HC | Construction Of Government-owned Contractor-operated (goco) Environmental Laboratories |
| Y1HZ | Construction Of Government-owned Government-operated (gogo) Environmental Laboratories |
| Y1JA | Construction Of Museums and Exhibition Buildings |
| Y1JB | Construction Of Testing and Measurement Buildings |
| Y1JZ | Construction Of Miscellaneous Buildings |
| Y1KA | Construction Of Dams |
| Y1KB | Construction Of Canals |
| Y1KC | Construction Of Mine Fire Control Facilities |
| Y1KD | Construction Of Mine Subsidence Control Facilities |
| Y1KE | Construction Of Surface Mine Reclamation Facilities |
| Y1KF | Construction Of Dredging Facilities |
| Y1KZ | Construction Of Other Conservation and Development Facilities |
| Y1LA | Construction Of Airport Service Roads |
| Y1LB | Construction Of Highways, Roads, Streets, Bridges, and Railways |
| Y1LC | Construction Of Tunnels and Subsurface Structures |
| Y1LZ | Construction Of Parking Facilities |
| Y1MA | Construction Of Epg Facilities - Coal |
| Y1MB | Construction Of Epg Facilities - Gas |
| Y1MC | Construction Of Epg Facilities - Geothermal |
| Y1MD | Construction Of Epg Facilities - Hydro |
| Y1ME | Construction Of Epg Facilities - Nuclear |
| Y1MF | Construction Of Epg Facilities - Petroleum |
| Y1MG | Construction Of Epg Facilities - Solar |
| Y1MH | Construction Of Epg Facilities - Wind |
| Y1MZ | Construction Of Epg Facilities - Other, Including Transmission |
| Y1NA | Construction Of Fuel Supply Facilities |
| Y1NB | Construction Of Heating and Cooling Plants |
| Y1NC | Construction Of Pollution Abatement and Control Facilities |
| Y1ND | Construction Of Sewage and Waste Facilities |
| Y1NE | Construction Of Water Supply Facilities |
| Y1NZ | Construction Of Other Utilities |
| Y1PA | Construction Of Recreation Facilities (non-building) |
| Y1PB | Construction Of Exhibit Design (non-building) |
| Y1PC | Construction Of Unimproved Real Property (land) |
| Y1PD | Construction Of Waste Treatment and Storage Facilities |
| Y1PZ | Construction Of Other Non-building Facilities |
| Y1QA | Construction Of Restoration Of Real Property (public Or Private) |