Below the surface the chips got wetter, and the deeper I dug the more moldy the chips. Many coins were near the surface and fresh, but others were so far down that I had to use my trowel to break up the compressed chips.
There were a couple of interesting finds like this token for "Gatti's GREAT FOOD - GREAT FUN" with "UNITED STATES OF AMERICA - LIBERTY" on the back.
And this "Oliver Vending Game Token" that says: "NO CASH VALUE" on the back:
And a pretty pendant that I'm sure some child missed for a day or so:
I cleaned all the coins up in my rock tumbler with white vinegar and a teaspoon of salt. Pennies and tokens in one batch for 2 hours and the dimes/nickels/quarters for 4 hours. Some were really stained from the wood chips, but not badly corroded as they would have been in dirt. They all came out quite clean.