Flatwise 2x4 starts at the high end on the sloping existing concrete (far right above), anchored with double 16d nails hammered into drilled 1/4-inch holes. Tapered formwork was then attached to it for a level top. 2x12's continue over dirt, anchored with standard steel stakes. The 2x4 redwood is just sitting for a dry fit (the sections clamped for glue to dry). It will embed in the new concrete during the pour as a sill plate for some type of screen fence.
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