I need to dig a footing 8" wide, 30" deep and 18' long. I can't use a backhoe due to space limitations. The soil is hard clay so I don't want to dig by hand. My two ideas were to rent a two-man auger and bore holes and then dig out the space between holes by hand -or- rent a walk behind trencher and dig two trenches on the edges and then dig out center by hand. I've never use either of these machines so I don't know how hard they are to operate and control. Anybody want to comment or have an alternate suggestions? Here's a pic of the soil.
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