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I'm saying that Javadog is 100% on the money with his post.
You do not want to have any conduit, or pipe in the slab. You want to have sufficient cover (dirt) compaction beneath the slab. This assumes that you have had a soil test done, and the Geotech has recommended a minimum ground cover in his report.
You also need to have adequate fall around the structure so that water does not migrate beneath the foundation and worse, up into your finished floor. If you do not attend to this now, then you'll be excavating and repouring your flatwork later.
What you're calling "foundation work" goes under the category "site work" and is your source of risk. Someone did not do his homework. I would excavate the roots and crap. You need compaction. Roots will decompose. Enough of it, and you'll have methane gas in your building.
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