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33.50.00 Hydrocarbon Utilities
33.56.00 Hydrocarbon Storage
33.56.13 Aboveground Hydrocarbon Storage Tanks 33.56.21 Ground-Level Fixed Roof Hydrocarbon Storage Tanks 33.56.21.13 Double-Wall Ground-Level Fixed Roof Metallic Hydrocarbon Storage Tanks 33.56.21.16 Single-Wall Ground-Level Fixed Roof Metallic Hydrocarbon Storage Tanks 33.56.21.23 Single-Wall Ground-Level Fixed Roof Non-Metallic Hydrocarbon Storage Tanks 33.56.21.26 Double-Wall Ground-Level Fixed Roof Non-Metallic Hydrocarbon Storage Tanks 33.56.23 Ground-Level External Floating Roof Hydrocarbon Storage Tanks 33.56.26 Ground-Level Internal Floating Roof Hydrocarbon Storage Tanks 33.56.33 Underground Hydrocarbon Storage 33.56.33.13 Double-Wall Metallic Underground Hydrocarbon Storage Tanks 33.56.33.23 Single-Wall Metallic Underground Hydrocarbon Storage Tanks 33.56.33.26 Single-Wall Non-Metallic Underground Hydrocarbon Storage Tanks 33.56.33.29 Double-Wall Non-Metallic Underground Hydrocarbon Storage Tanks 33.56.33.43 Underground Hydrocarbon Storage Caverns 33.56.43 Aviation Fuel Storage Tanks 33.56.43.13 Ground-Level Aviation Fuel Storage Tanks 33.56.43.53 Underground Aviation Fuel Storage Tanks 33.56.53 Compressed Gaseous Hydrocarbon Storage Tanks 33.56.60 Moveable Hydrocarbon Storage Tanks 33.56.93 Hydrocarbon Tank Linings 33.56.96 Hydrocarbon Storage Tank Appurtenances