Vertical from the outlet location to the top of the slab makes sense, but I agree with the OP that you do not want to hit these wires. It occurred to me the house plans filed with the county MAY have these details. I was able to get mine several years ago by calling Sumter County Building Department and giving them my address and an email, I received 16 or 17 pages of house plans. Ours in a block home so it did not include the type of detail you are looking for, but the drawings for yours should have this for the actual construction so these are not hit when the house is assembled.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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