Using the jack hammer, we can break up the top layer of rock in the trench that we've dug.
and then several days of moving the rocks and dirt out of the trench gets us down a foot or so.
But we need more depth than this, so we go back for another round, to get another foot deeper.
Expanding out from this, we can get down 24 to 30 inches.
The bump by the capped-off remains of the sprinkler lines is the French Drain that we installed from here to the back yard years ago.
Now we just continue to push the deep part towards the street, breaking off rock and hauling it out.
The rock is a strange mix of limestone. Some of it is hard and brittle, but most of it is soft and crumbly. We get a lot of rock dust, which is almost like soil or sand.