I hope to have the hole finished tomorrow, but it will take as long as it takes to get the depth I want.
The digger handles should be even with or below the ground. We will see if i can get it that deep.
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My goal on concrete is at least 15 bags. Each bag will weigh 40 pounds or 18 Kg. I am digging in slate rock and clay. The hole depth and amount of concrete I need may not be the same for other parts of the world.