Septic Tank Lid

I have exterior sheathing made with tarred paper facing and gypsum center...
Yep sheetrock for sheating...
Now add classic cedar shingles with lots of nails...
Still standing since 1954...
Found out that we have some old indians buried a few houses up...
Found a woman and child with arrowheads in the bodies...
So be glad all you found was bad pipe...
Find an indian here and you get shut down for quite a while...