Questions about: excavation

The documentation within this section provides general safety information and operating instructions by equipment type. Specific controls, functionality and operating instructions can vary by brand, model and year. It is up to you, the operator, to e
Based on your rather telling but incomplete information, I have to caution you on your plans. This may have changed, I haven't had septic in 20-years. Not good & not legal, if the field hasn't been unused for 20-years
I have a pipe of some kind buried about 6" below grade in my backyard. Photos are provided below. I have no idea what this line might be, and was hoping to solicit ideas