I'm having a house built and they just completed pouring the slab for the foundation a few days ago. When I inspected it today I noticed several narrow (but sometimes long; one or two do them appear to run nearly across the entire slab) cracks in the concrete. Here are some pictures:
Can anyone tell me if this is something I should be concerned about, or is it standard to find these kinds of small cracks in freshly laid concrete?
Secondary question; I also noticed a few other things that seemed like defects. Are any of these cause for concern:
Edit - Here's a shot of what was in place immediately before the slab went down: