I have a 5'x4' chicken run with sand on a concrete floor. I've used the sand for about a year and half now, without replacing any. There is a detectable smell now when I kneel down in the run which is bothering me. I have been scooping out poop nearly daily since I have been using it. I only used about 10 bags (can't remember how heavy each bag was, 30 pounds? they weren't that big) when I first filled the run. Right now, there is probably about 6-7 bags (worth) of sand in the run. I would like to replace it all with new sand. Does anyone have any suggestions on how and where to dump the sand? I live in a suburban neighborhood. I am thinking I may have to hire a company or service to pick up and dump the sand for me. I hope it is not expensive otherwise I would be paying $100 to dump dirty sand that originally cost maybe $20 new. Has anyone had any experience with dumping/replacing sand?