With the dirt supply, lay dirt, and compact it to form an even leveled to the concrete perimeter. Do not damage the P.V.C. for too much dirt compacted near it. If questionably, you can leave dirt out in areas such as the pipe, where the concrete may just pour around it, and not so level minded tis the need for the underside of the finished pour of concrete too. You just need it really, really compacted from the first time, and any more put in, and more should be, the floor shouldn't be flush with or go below the perimeter wall of concrete thus far, so that the walling rebar enforced is the lowest thing into the overall around dirt. Any shifting in the dirt from not compacted properly risks the foundation. In this design, thick flooring is not supported. Rather, any cracks that do arise are, as they would not be foundation threatening, only water intrusive in higher storm rains, in a sense, the floor is flexible enough and not foundation supportive enough that it's repairable.
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