The top 12 inches of an embankment may not include particles larger than which size?

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Multiple Choice

The top 12 inches of an embankment may not include particles larger than which size?

Explanation:
In earthwork, the surface layer of an embankment must be sized so it can be compacted evenly and provide a smooth, stable bearing for anything placed on top. If oversized particles are present in the top boundary, the compaction equipment can’t bury or crush them effectively, leaving hard pockets, voids, and uneven settlement that translate into a rough surface and potential structural issues later on. Limiting the top 12 inches to only smaller particles—specifically up to three and a half inches—helps ensure the material settles uniformly under rollers or tampers and forms a solid, uniform layer. The rest of the fill below can contain larger material, but the surface layer must be fine enough to compact well and provide a good finish.

In earthwork, the surface layer of an embankment must be sized so it can be compacted evenly and provide a smooth, stable bearing for anything placed on top. If oversized particles are present in the top boundary, the compaction equipment can’t bury or crush them effectively, leaving hard pockets, voids, and uneven settlement that translate into a rough surface and potential structural issues later on. Limiting the top 12 inches to only smaller particles—specifically up to three and a half inches—helps ensure the material settles uniformly under rollers or tampers and forms a solid, uniform layer. The rest of the fill below can contain larger material, but the surface layer must be fine enough to compact well and provide a good finish.

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