ORIGINAL: davidmil
I think those underground lines bleed off all the time. We used to have one cut through the woods where I hunted. They crossed it religiously every morning and every night. Smelled stuff all the time. I don't think it bothers them at all.
Ditto, this, the lines do constantly "bleed," and most of the places I hunt you can catch a little hint of Nat. Gas somewhere on the property, some places a BIG HINT. I've killed several deer within 100yds of wells on one property in particular.