I am an over-researcher, so I've been sitting on this chicken thing for a while trying to get my info together. We live in CO and so I have winters to consider, and in terms of keeping the coop dry and warm, want to locate it in the backyard where it has the best protection and a good dose of morning sun. The problem is that in that location is an old fish pond, since filled to make a sand pit. Sadly, the local roaming cats have enjoyed it more than my kids. I'm wondering if 1) we should just rip it out or 2) put the coop/run over it. Are there safety or hygiene issues for my chickens I should be considering? Thanks in advance for your feedback!