22 15 00 General Service Compressed-Air Systems 22 61 00 Compressed-Air Systems for Laboratory and Healthcare Facilities 23 00 00 Heating, Ventilating and Air Conditioning (HVAC) 43 15 00 Process Air and Gas Filters 44 10 00 Air Pollution Control 46 51 00 Air and Gas Diffusion Equipment 50 59 00 Construction Material Delivery/Hauling 50 61 00 Construction Material Supplier 50 63 00 Equipment/Tool Sales 50 64 00 HVAC Supplies

31 00 00 Earthwork 46 00 00 Water and Wastewater Equipment

02 41 00 Demolition 02 50 00 Site Remediation 02 55 00 Remediation Soil Stabilization 02 66 00 Landfill Construction and Storage 03 05 00 Common Work Results for Concrete 03 11 00 Concrete Forming 03 40 00 Precast Concrete 31 10 00 Site Clearing 31 23 00 Excavation and Fill 31 32 00 Soil Stabilization 32 15 00 Aggregate Surfacing 32 16 00 Curbs, Gutters, Sidewalks and Driveways 32 32 00 Retaining Walls 33 36 00 Utility Septic Tanks 41 22 00 Cranes and Hoists 46 70 00 Water and Wastewater Residuals Handling and Treatment