Its 7:30 AM and there's jackhammering

It's 7:30 AM with partially clear skies (somewhere in Seattle, because we have the part with the clouds here in Redmond). I'm well into my cup of coffee this morning and there's jack hammering going on across the street from my house...some kind of underground utilities thing. Granted, it's a work day. But still....7:30? Jackhammering? How is that OK?