31 - Earthwork

31 0500 - Common Methods and Materials
- 31 0530 - Geosynthetics
31 2000 - Earth Moving
- 31 2300 - Excavation and Fill
  - 31 2340 - Lightweight Fill
- 31 2500 - Erosion and Sedimentation Control
  - 31 2570 - Temporary Erosion Control
  - 32 1110 - Soil Stabilized Paving (for earthwork erosion control)
31 3000 - Earthwork Methods
31 4000 - Shoring and Underpinning
- 31 4120 - Sheet Piling
31 5000 - Excavation Support and Protection
- 31 5100 - Anchor Tiebacks (Tension)
- 31 5200 - Cofferdams
31 6000 - Foundations and Load-Bearing Elements
- 31 6200 - Bored and Driven Piers and Piles
- 31 6800 - Residential Foundations and Basement Walls

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