The following works and attendance shall be provided by the Sub-Contractor:
Excavation, back filling, and compaction for all pipe trenches.
All cutting, drilling, and modifications to the Building Works.
All concrete bases, foundations, and pads for the Utility Works.
Flashing for pipes passing through roofs and wet areas.
Sleeves for pipes passing through floors and walls.
Hangers and supports
Pipe cleaning and flushing