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Some free advice...
You haven't shared the foundation details but I hope you're going to back fill that hole with structural fill and compact it, before starting on the foundation. You don't want your finished floor elevation to be anywhere near that low. I wouldn't wait, either. Any rainfall now is going to undermine the compaction of the subsoil.
You should also grade the surrounding area before you start the foundation, as doing it after the structure is built is orders of magnitude more difficult.
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