Welcme to the forum, hope you post more. Great story...glad you hit a great spot. I'm from Waldoboro. Let me know if you want to secure some privy digging permissions together. I've got some leads, just need to find the time.
I found a similar dump in Rockland that took 3 seasons to finish. Got a ton of stuff too. The're out there, hard to find, but it just proves that they all didn't get dug yet.
it seemed like the hill got covered over with sand and dump material in differnt times but where the elbow of hard clay is on the very bottom, thats where we found most of the pontil bottles.