9/3/2017 – The sounds of raindrops

Elmer’s Crane and Dozer, out of Traverse City states the following in their presentation:

We measured the noise volumes of our portable gravel plant and construction equipment operating on August 1, 2017 at a customer’s gravel pit at multiple distance intervals.  The gravel pit is flat and has no screening.

  • 100 feet: 77 to 78 decibels. This is comparable an enclosed cab tractor.
  • 500 feet (MSHA minimum distance from residences): 59-64 decibels. This is comparable to normal conversation.
  • 1000 feet (expected actual distance from residences): 45 to 64 decibels. This is comparable to raindrops and normal conversation.

The following audio was taken from over 2000 feet away from the Manthei gravel pit.  The audio was not increased or changed in any way and taken with an iPhone on 8/28/2017 at 10:12 AM.  Does this sound like rain drops?  Keep in mind this is over 1000 feet greater than what Elmer’s out of Traverse City is calling comparable to raindrops.

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