1.   Builders often collect rocks when they excavate the ground for a foundation.

2.   The ground must be excavated to accept the right shape and dimensions of the liner.

3.   With the edgings firmly in place you can excavate the ground in between, then pour the four-inch gravel subbed.

4.   The prosecutors said they suspected that while excavating the ground to lay foundations, the workers might have accidentally punctured the gas main.