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I'm finally going to get something more permanent laid down, but am really concerned about being able to take it apart again. If we sell the house, the existence of a raised (16" - 20") railway in the middle of the yard (which is the most likely location right now) would be a real issue. And if I have to take it apart and somehow 'lose' 15 cubic yards of dirt/rock in a 3000 square foot yard, there's gonna be trouble. I consider styrofoam/extruded foam to be my best solution for filler -- but when buried do such materials emit any chemicals into the soil? Zone 5, so 90-degree summers (humidex maybe around 100-degrees) and 0-degree winters. And YES, the perimeter of the yard is not an appealing location because I built the fence before taking railroad considerations into account.
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