Evidence of long distance noise intrusion

Last week the university of Groningen (RUG) presented a report about noise levels of windturbines. In the investigations they measured a group of turbines near the German border near a place called Bourtange. The people of Bourtange had complains to the noise level of the turbinepark at about 800 meters. The university investigated the problems and came out with completely new figures. The point is that noise levels normaly are taken at a height of 10 meters. What they figured out is that in a stable weather pattern  the wind at 80 to 90 meters is compledly different than at 10 meters. This is caused by temperature layers that rise and fall..
In short the conclusions are that the windspeed at 80 meters on a normal summer's day   just before sundown is twice as high as at 10 meters. They measured on a Tacke TW 1.5 turbine. Normally the manufacturers conclude that at a windspeed of 3 m/s at 10 meters the speed at 80 meters will be 4.1 m/s. The university measured 14.7 m/s so also the noise production will be a lot higher.
I think that there is proof now that people have noise problems at big distances from turbines and that the regulations have to be changed.
The address of the university is:

Rijksuniversiteit Groningen
Nijenborgh 4
9747 AG Groningen
tel: 050 - 3634867
nawi@phys.rug.nl