When rebuilding a drain field, is it imperative to dig individual trenches for each "tine" of the drain pipe "fork", or would it be possible to just dig one big hole to lay all the piping down. If I can just dig one big hole, I can just rent a skid steer. If I need to dig trenches, I'll have to rent a backhoe.
How deep below grade do the pipes need to be? I live in a place where frost typically reaches 6 feet or deeper before spring melt.
How much crushed rock needs to be beneath the pipes? Is there a limit to how deep the crushed rock can be? Is there a benefit of greater field capacity with deeper gravel?