re: Dirt work (buying sand)

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I suggest concrete, broken bricks, cinder blocks, whatever you can get to fill the void.

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I would not suggest this. If you ever have to dig it up, it will be a nightmare.

The purpose of layering with riversand first is to allow water to drain through your backfill. Clay and dirt hold water thus increasing the amount of hydrostatic pressure on your bulkhead.

I have seen many walls blown out because the fill material did not allow water to drain from behind the wall.

Layer with sand first then use topsoil for the top 1.5' to 2'.

What kind of sheetpile did you use?