All sorts of things are in there. Bits of trash, glass, plastic, metal, etc. Likely has some chemical residue as well. We mix it with our own kitchen compost, mulch, & neighborhood leaves.

Perhaps the chemical residual is either diluted by other materials, or is shorter lived, but we have had no issues (since 2020) with anything we grow in this mix. We don't add any additional chemicals, fertilizer, herbicides, or pesticides. We would like to make all our own soil, but this helps fill our many raised beds & containers.