Motorsport facilities do not need to cause significant noise pollution. The BMR family resort will keep noise levels to a minimum.
BMDC hired ACI Acoustical Consultants Inc. to conduct an environmental noise impact assessment. It generated a computer noise model of the Road Course to determine the relative impact on nearby residential receptors that are not part of the concept plan.
Environmental noise impact was measured using 1 3D digital sound model of the entire site based on the preliminary design concept by Alan Wilson (figure 2) and the projected number and type of vehicles to be using the site.
The majority of users would drive street legal BMWs, Porches, Corvettes and like cars which produce much lower sound levels than dragsters and stock car racers.
The results of the noise modelling indicated noise levels at various surrounding receptor locations below the permissible sound level (PSL) of 50 dBA LeqDay.
The highest noise level modelled (at the closest receptor) was 37.1 dBA (figure 4) which is similar to a quiet residential neighbourhood (figure 3). This would be audible, but still well below the guideline PSL.
At the town of Rosebud, the projected noise level is 19.7 dBA (figure 4) which is similar to a soft whisper. It would likely be inaudible (figure 3).
No additional noise mitigation is required based on the typical maximum weekend course usage data.