Scheduled maintenance - Thursday, July 12 at 5:00 PM EDT
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How material should be stockpiled depends on the nature of the material itself. The overall goal is to create a stockpile that is stable. This stability will depend on many conditions, including:
Examples of loose material include sand, gravel, salt, slag, etc.
In general:
There may be certain regulated requirements, or other aspects (such as the height and angle of repose) may need to be determined by a professional engineer or inspected by a competent person – check with your jurisdiction for exact requirements.