I have had 10 out of 22 chicks die within a 5 month period. All chicks are 5-7 months old. Took #3 in for necropsy and was told he died of gout in his kidneys, it shouldn't affect the rest of my flock. Finally took #9 death in and was told she was full of round worms. A vet told me to treat with Wazine every seven days for a 3 week period. The state extension office called me and told me to, "cull the coop, move my coop to a completely new area and start over in the spring with chicks bought from a store." (I purchase these from a local farmer.) I was told the round worm eggs can live in the soil for 2-3 years and if I leave my chicks in the old area I will never get rid of the problem and can never bring new chicks into that area. I have $$$ galore into this coop. We have cemented the fencing into the ground to keep predators out and have an outdoor run that is about 60 by 60. My husband isn't to keen on starting this project over. How do I clean the soil to prevent re-infestation? Can it every be safe to raise babies there?