So we start by digging a hole.
Then we expand and deepen that hole.
Notice that we are uncovering the main sprinkler water supply line, and the wiring that controls the various irrigation valves for Zones 6 to 11 (and the ground). We have to dig carefully to avoid breaking this water supply line.
Digging on the other side of the water supply line, right up to the house, and the wall for the Iris bed.
We hit a solid layer of rock, about 16 to 20 inches down. That seems almost deep enough. Using the jackhammer, we create a hole near the Iris bed that goes thru this layer of rock to the next level. That is another 12 inches.
So we could take out another 12 inches of rock to get to 32 inches deep. But this rock is very solid limestone; it does not break easily. And it is 12 inches thick. And we are hemmed in by the house on one side and the River of Rocks on the other, so we can't really work freely in this narrow slice of the backyard. Although it is 34 feet long, it is at most 80 inches wide, and most of it is half that width. So we will just stay at the 16 to 20 inch level.
Keep digging, mixing the soil with leaves, and filling in the bottom half of what has already been dug out.
And keep digging. We come across a big rock.
but using the jackhammer, we can break it into smaller pieces and pull it out, leaving more digging to do.
With more digging, we find more rock,
which is then broken up