- 02325 - Dredging
- 02400 - Tunneling, Boring and Jacking
- 02455 - Driven Piles
- 02475 - Caissons
- 02600 - Drainage and Containment
- 02620 - Subdrainage
- 02630 - Storm Drainage
- 02660 - Ponds and Reservoirs
- 02810 - Irrigation Systems
- 05 12 00 - Structural Steel Framing
- 05 12 13 - Architecturally-Exposed Structural Steel Framing
- 05 12 16 - Fabricated Fireproofed Steel Columns
- 05120 - Structural Steel
- 15105 - Pipes and Tubes
- 15120 - Piping Specialties
- 15520 - Feedwater Equipment
- 15550 - Breechings, Chimneys, and Stacks
- 15640 - Packaged Cooling Towers
- 15710 - Heat Exchangers
- 15800 - Air Distribution
- 15810 - Ducts
- 15860 - Air Cleaning Devices
- 21 05 19 - Meters and Gages for Fire-Suppression Systems
- 22 05 19 - Meters and Gages for Plumbing Piping
- 23 05 19 - Meters and Gages for HVAC Piping
- 23 30 00 - HVAC AIR DISTRIBUTION
- 23 31 00 - HVAC Ducts and Casings
- 23 31 13 - Metal Ducts
- 23 31 16 - Nonmetal Ducts
- 23 33 46 - Flexible Ducts
- 23 35 13 - Sawdust Collection Systems
- 23 40 00 - HVAC AIR CLEANING DEVICES
- 23 41 00 - Particulate Air Filtration
- 23 41 33 - High-Efficiency Particulate Filtration
- 23 41 43 - Ultra-Low Penetration Filtration
- 23 43 00 - Electronic Air Cleaners
- 23 51 00 - Breechings, Chimneys, and Stacks
- 23 51 13 - Draft Control Devices
- 23 51 16 - Fabricated Breechings and Accessories
- 23 51 19 - Fabricated Stacks
- 23 51 23 - Gas Vents
- 23 51 33 - Insulated Sectional Chimneys
- 23 53 00 - Heating Boiler Feedwater Equipment
- 23 53 13 - Boiler Feedwater Pumps
- 23 53 16 - Deaerators
- 23 57 00 - Heat Exchangers for HVAC
- 23 57 16 - Steam-to-Water Heat Exchangers
- 23 57 19 - Liquid-to-Liquid Heat Exchangers
- 23 65 00 - Cooling Towers
- 23 65 13 - Forced-Draft Cooling Towers
- 23 65 16 - Natural-Draft Cooling Towers
- 31 01 62 - Maintenance of Driven Piles
- 31 09 16 - Special Foundation and Load Bearing Elements Instrumentation and Monitoring
- 31 62 00 - Driven Piles
- 31 62 13 - Concrete Piles
- 31 62 16 - Steel Piles
- 31 62 19 - Timber Piles
- 31 62 23 - Composite Piles
- 31 64 00 - Caissons
- 31 64 13 - Box Caissons
- 31 64 16 - Excavated Caissons
- 31 64 19 - Floating Caissons
- 31 64 23 - Open Caissons
- 31 64 26 - Pneumatic Caissons
- 31 64 29 - Sheeted Caissons
- 31 70 00 - TUNNELING AND MINING
- 32 80 00 - IRRIGATION
- 32 84 13 - Drip Irrigation
- 32 84 23 - Underground Sprinklers
- 32 86 00 - Agricultural Irrigation
- 33 40 00 - STORM DRAINAGE UTILITIES
- 33 41 00 - Storm Utility Drainage Piping
- 33 44 00 - Storm Utility Water Drains
- 33 44 13 - Utility Area Drains
- 33 46 00 - Subdrainage
- 33 46 13 - Foundation Drainage
- 33 46 16 - Subdrainage Piping
- 33 46 19 - Underslab Drainage
- 33 46 26 - Geotextile Subsurface Drainage Filtration
- 33 46 33 - Retaining Wall Drainage
- 33 47 00 - Ponds and Reservoirs
- 33 47 13 - Pond and Reservoir Liners
- 33 47 16 - Pond and Reservoir Covers
- 33 47 19 - Water Ponds and Reservoirs
- 33 47 23 - Sanitary Sewerage Lagoons
- 33 47 26 - Storm Drainage Ponds and Reservoirs
- 33 49 13 - Storm Drainage Manholes, Frames, and Covers
- 33 49 23 - Storm Drainage Water Retention Structures
- 35 20 23 - Dredging
- 44 11 16 - Industrial Dust Collectors