Can someone tell me is there are any potential dangers with placing a coop here? I have cleared out a place in my suburban back yard for my new chicken coop and chickens coming in the spring. I seem to have found an area where the soil has a lot of what looks to be old coal ash or whatever you call it from burning coal. The "soil" is very gritty and dark, and has some of those clinkers from incomplete coal burning. It has to be from long ago because nobody here now has coal furnaces. The coop and part of the run will sit over that area. With the chickens picking around in the ground, could there be residual heavy metals or toxic residue in this soil that could poison them? I am looking forward to raising healthy chickens and want to start off right. However, this is really the only area in my yard where the coop can go. Thanks in advance for any helpful information in dealing with this. I love this site and have already gained so much helpful information.