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Basically you would fill it with dirt and rocks and, optionally, cap it with concrete. The "dirt and rocks" part is also known as clean fill. You may have seen hand-lettered signs up for CLEAN FILL or CLEAN FILL wanted - that's what they're talking about. It's CLEAN if it doesn't have anything in it that would decay over the years and form a void within the area you filled, causing a sinkhole - you DON'T want that. So, no old tree stumps or other kinds of garbage that would biodegrade over time.

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13y ago

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