It's still pretty wet out there, but seems to have dried up enough to work. I think that the French drain is actually working, and over the past week or more, the water has worked its way into the French drain, down the pipe to the retention pond and then out the drainage holes into the trench from digging and down the
yard to the corner.
But despite that, and the dirt being wet, I dug out the last part.
This gets me all the way from the drainage pond to the fence corner and then back to the retaining wall that should seal the bamboo grove off from the yard.
The next step will be to pour a concrete wall under the fence and put rock on the top to match the retaining wall. This will prevent the bamboo from escaping under the fence, and confine it completely to this one area of the back yard.
I've started collecting together the rocks to go on top of the cement wall. I need to get some "forms" to outline the wall. Previously, I just used some 2 foot by 8 foot pieces of masonite. It's light weight and smooth on one side, and flexible, so it's easy to work with. And I need concrete mix. I'll need to figure out how much.