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Post Installed Anchors in Young Concrete

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I have a contractor that is casting a small pump pad and five days later wants to drill and epoxy anchor bolts into the pad for the small pump and motor.  Does anyone know of any guidance on how much strength or how old the concrete should be before drilling and epoxying? 
I don't need the anchors to actually hold their load until later when the rest of the piping is hooked up and by then the concrete will reach it's design strength.  I'm more worried about damage to the concrete pad or integrity of the installed anchor when it is installed in green concrete.
I appreciate your thoughts and comments!
Phoenix, AZ