Broken Pipe update: I think the last two utility companies marked their lines yesterday. They are the closest ones to the dig site, but I still have 3-4 feet between the dig area and the lines.
As of today, I think i'm going to rent a mini-excavator to dig the majority of the hole, and then hire a day laborer to finish digging around the pipe etc.
That could change.
Option B would be to just hire two laborers and have them dig the entire hole by hand. It would be 4' wide, 5-6' long and 6' deep. Likely will be a lot of red clay, and definitely will be a lot of tree roots.