It's all done! We had a guy come in with a backhoe...........he followed the pipe (PVC) out and located the tank. It ended up being about 20 feet from the house! The inspector checked it out, and is amending his original report to read "complete, and satisfied". And it was all done by our deadline date. Phew!
Glad this is over, now we can move forward.
Thank you to everyone who gave me their input. :-)