A General Engineering ContractorB General Building ContractorC-2 Insulation and AcousticalC-4 Boiler, Hot-Water Heating and Steam FittingC-5 Framing and Rough CarpentryC-6 Cabinet, Millwork and Finish CarpentryC-7 Low Voltage SystemsC-8 ConcreteC-9 DrywallC-10 ElectricalC-11 ElevatorC-12 Earthwork and PavingC-13 FencingC-15 Flooring and Floor CoveringC-16 Fire ProtectionC-17 GlazingC-20 HVACC-21 Building Moving/DemolitionC-22 Asbestos AbatementC-23 Ornamental MetalC-27 LandscapingC-28 Lock and Security EquipmentC-29 MasonryC-31 Construction Zone Traffic ControlC-32 Parking and Highway ImprovementC-33 Painting and DecoratingC-34 PipelineC-35 Lathing and PlasteringC-36 PlumbingC-38 RefrigerationC-39 RoofingC-42 Sanitation SystemC-43 Sheet MetalC-45 SignC-46 SolarC-47 General Manufactured HousingC-50 Reinforcing SteelC-51 Structural SteelC-53 Swimming PoolC-54 Ceramic and Mosaic TileC-55 Water ConditioningC-57 Well DrillingC-60 WeldingD-06 Concrete Related ServicesD-12 Synthetic ProductsD-16 Hardware, Locks & SafesD-21 Machinery and PumpsD-24 Metal ProductsD-28 Doors, Gates and Activating DevicesD-34 Prefabricated EquipmentD-35 Pool and Spa MaintenanceD-38 Sand and Water BlastingD-39 ScaffoldingD-41 Siding and DeckingD-42 Non-Electrical Sign InstallationD-49 Tree ServiceD-50 Suspended CeilingsD-52 Window CoveringsD-53 Wood TanksD-56 TrenchingD-59 Hydroseed SprayingD-62 Air and Water BalancingD-63 Construction Clean-UpD-64 Non-SpecializedOther / Explain