We’ve located the old septic system tank and dry well. Looks like we MIGHT not have to dismantle the garden after all. We’ll know better Monday morning after they pump the tank and bash it in so they can connect to the pipe that comes out of the house.
They’ve dug more trenches: a big one for the pipe from the new building and a smaller one for the electric conduit that comes to the house.
The yard will stay this way for the weekend. Everybody and their brother is coming on Monday morning at 7 am for the big test of the system. They’ll disconnect the old , test the new, and then hopefully connect us to the new system. Then they can close up all the trenches and finish the mound.
That will be nice.
Mountain Vistas 
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Keep up the good writing.