This site is about as perfect as they come. Easy to move the machines around, great local material and generally flat.
Backfill required more than 200 yards of compactible fill. We had plenty, it was nearby it only cost machine time! Typically the old building Dirt axiom is You pay (a lot) when you need it and you pay (a lot) when you have too much to get rid of it." That seems to be true most of the time in my experience.
We backfilled in 8" lifts compacting with three passes (minimum) as we went. Makes for a long day but in the end you can drive your truck on it and it doesn't even leave a track.
We ran out of light on the first day and finished up by lunch the next.