PilotFighter-

Glad you pointed that out. Actually, those figure are a bit more liberal than typical. Most localities that have objective levels specified in the ordinances say 55 dBA for residential and other noise sensitive locations (schools, hospitals, libraries, for example) during daytime hours, and usually 5-10 dB less during 'sleeping' hours. Figures in the range you cited are okay in commercial and industrial zones. These are the levels recommended by agencies charged with environmental quality, including HUD, ANSI and internationally, ISO. The well drafted ordinances specify an "equivalent" level to cover intermittent sources, which is the average level over some integration period, usually one hour.
Objective levels in the codes and ordinances is a good thing for us, when we take the time to learn what they are and observe them. I have been involved in more than one dispute over noise complaints, and haven't lost in any. All it takes is gathering the data to show that your operations produce sound levels within what the law allows.
Many backwater municipalities still have prohibitions against 'loud, unnecessary and unusual noises' however, and there you are at the mercy of what side side of the bed the individual standing in judgment of your activity got up on. In CA, Los Angeles county has such a subjective ordinance. Moving South, Riverside County has no noise ordinance on the books and so complaints are are handled under general nuisance provisions, i.e., subjective judgement again, and you have to get to San Diego County before finding reasonable, objective Codes and Ordinances re noise that follow state and federal guidelines for such.
At any rate, I'd have say that if you don't know what the law is regarding noise in the locality where you fly, you certainly can't demonstrate that you have taken actions to be compliant with it. If that's the case, then yes, a noise complaint could well be the end of your club's flying site. ('your' used generically - PilotFighter clearly knows this)

Abel