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Thanks for the replies, guys.

The following table (from a musician's web site) helped simply things a bit for me.

Perceptions of Increases in Decibel Level
Imperceptible Change 1dB
Barely Perceptible Change 3dB
Clearly Noticeable Change 5dB
About Twice as Loud 10dB
About Four Times as Loud 20dB

There are some residential back yards even closer to the proposed well site than our classroom, so those folks could be even more unhappy campers once they get cranking. What the drilling company has done at another current site in the area is stack 8' X 8' X 40' shipping containers 2 high around the perimenter of the pad site ...

I wish it was 600 yards, but it's to be less than 600 feet.

Gun show table at Market Hall is unmanned just, now, so I best get on down that way. Thanks for the "calcs".

Unfortunately, it's looking like a gas well drilling company is about to get a variance to be able to drill the first of who-knows-how-many wells about 600' from our "outdoor classroom" at the range. Their "sound management plan" predicts approximately 77 dB(a) when measured 300' from the rig. (Coincidently, the max supposedly allowed by the little town ordinance is 78.) Somewhere in my notes from one of the meetings, I have "each doubling of distance results in a reduction of 6 decibels". Truth or trash?

Once their pad site is cleared, there may not be much between us and the pad site except a (perpendicular) asphalt road, our gravel parking lot and about 150' of grass. Any SWAGs on how loud it's gonna be?