Milwaukee noise ordinance?

Hey folks, I am a restaurant manager on the East side. Tonight, after one of my employees dumped our loose recyclables into our dumpster we received a very angry phone call from a woman who explained that there is a nighttime noise ordinance between the hours of 9pm and 7am. She apparently can hear us dumping our recycled glass, cans, etc from blocks away and we are waking up her child. Obviously I expressed my apologies and tried to get her information so she could have a constructive conversation with my GM on how to resolve this issue but she hung up on me.

I am curious if the sound of us dumping our recyclables is technically in violation of the city’s noise ordinance? I’m genuinely sorry for waking her child, I understand that is frustrating. We don’t close until 10pm during the week and 11pm on Fri/Sat so I believe it’s unrealistic to expect us to dump our recycle bins before 9pm. Thoughts?