Chicken forage around treated lumber

I recently purchased a few hens and have been letting them free range. I would like to let them into a tree'd area within a field as it would provide all of their needs. However, about 15 years ago my aunt had her horse fencing installed and some of the treated fence post tops were discarded in that area. Im thinking that the arsenic and other chemicals present in the wood would have leached out and been absorbed/dissipated/degraded by now, and that I shouldn't have too much concern letting them forage the bushes, ground growth, insects, etc. Anyone have any thoughts?

Thanks,

Ryan

if i were you i would try to keep the chickens away from that small area where the wood was but you should be able to let them free range in that area.

Thanks. That is what I am thinking. I have researched treated wood degradation quite a bit and no one seems to have an answer or estimate as to when the dangerous compounds have been dealt with. I think I may run a fence through the area to keep them off that section and eventually get a soil test to see whats there.

Ryan