Curved lines going from E, F, G on the bottom are raceways for conduit coming at surface level. Alternately one can have the pad poured around the line and stubbed out at point D, corresponding to the 3" diameter hole 5" inboards from the bottom left corner on the top diagram that corresponds.
How I'd have it laid out on the concrete pad is rotated 90 degrees from the bottom image, with the stairs and the D-H side of things on the image left side of things. That'd place point D closest to the new subpanel, too, which is nice and clean.
The stairs are 27" deep, iirc. The hot tub is 94 x 94" and the pad will be 108 x 144". Therefore to center it along the short axis we'd have 7" on either side. If I put the same 7" margin on the non-stair side of the long axis that leaves 43" for the stairs + cushion, which seems just right.
So the center point of this 3" hole to stub out the wiring will be 7" margin + 94" length along the hot tub - 5" back from it == 96" along it if you're starting along the F side of the slab, if you will. The center point for the other axis will be 7" margin + 5" inboards from it, so 12" in from the D-E side of the slab.
Now that I look at the top diagram they actually use 89.7" dimensions for the base, not the 94" nominal one. So it's 5 x 5" inches in from the base, not the slightly sticking out panels that make it 94". This should mean that it should be 93.85" in from the F side of the slab down the long axis of the rectangle, 14.15" in from the D-E side of the slab to be precise (accounting for the 4.3"/2 thickness of the casing vs the base on each side).
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