I've found tin cans, bits of wire, paint or oil cans, gears and a couple large soild pieces of mining / farm machines.
There is ocean spray growing on part of it, 6 large Douglas Firs on one edge, I can add lime to the soil. Hazelnuts I know don't mind growing under the Firs, as well as other natives, red alder grows anywhere with water. I just wondering about other trees.
Most importantly can lead , mercury, arsenic, etc can travel from ground into plant and into fruits, leaves and nuts? Maybe the last question is off topic for this subforum.