Engineer - wrong foundation elevation

[billaboss]

I have bought a residential new build and the foundation poured does not match the footprint for my house. The house comes with the option of converting the three car garage to a two car garage with library in place of the third bay space. I selected the library option but they shaped the foundation elevation as if it was going to be a three car garage and now the elevation in the third bay is not even with the rest of the "living space." It is a post tention slab and I am not sure what the appropriate and acceptable corrections are for this mistake. What options do the engineer and superintendent have? I'm worried they'll botch it and just pour another layer of concrete on to fill in the elevation difference.

 

[broekie]

How much of an elevation difference is it?

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