31 Earthwork
31.01.00 Maintenance of Earthwork
31.01.10 Maintenance of Clearing 31.01.20 Maintenance of Earth Moving 31.01.40 Maintenance of Shoring and Underpinning 31.01.50 Maintenance of Excavation Support and Protection 31.01.60 Maintenance of Special Foundations and Load Bearing Elements 31.01.62 Maintenance of Driven Piles 31.01.62.61 Driven Pile Repairs 31.01.63 Maintenance of Bored and Augered Piles 31.01.63.61 Bored and Augered Pile Repairs 31.01.70 Maintenance of Tunneling and Mining 31.01.70.61 Tunnel Leak Repairs