posted on Sep, 4 2012 @ 06:03 AM
I was thinking maybe it was some type of industrial generator since the sound was a constant tone.
Seems like that would be pretty easy to find though since more equipment would probably be present as well. The pumper truck seems like a pretty
viable guess. If you guys have a local Public Works Dept you may check with them and see if they had some sort of emergency in your area. Were there
any power outages at the time around your area that night ? Maybe a utility company working on power lines, but again it seems like that would be
pretty easy to find.
That's about all I can think of