Took the first step towards building my shop

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By the time I have all of the fill in the shop the conduit will be almost 3 feet below the surface of the eventual slab

Conduit connected to the homemade 6x8x4 J box

What is the plastic pipe you used for the buried conduit? Looks like 3". I assume you have the wires installed already, unless you have some Greenlee power puller, and a helper to feed the wires.
Looks like your doing all the details toward the next big task of building walls.