5.3 Unmitigated Impact of Dura 40 Ball The initial model for the Dura 40 ball is shown in Figure 5.2. The contours are similar to the existing conditions shifted by approximately nine dBA. 5.4 Noise Abatement Plan for Dura 40 Ball Due to the large difference in ball and paddle impact sound pressures between the Foam Quiet and Dura 40 balls and the proximity of noise sensitive areas on all sides of the pickleball courts, a full perimeter wall system will be needed. For ingress and egress overlapping wall sections are used to create a passage while blocking line of sight from outside the wall. Parallel walls create reflections that build up between the interior surfaces significantly degrading the acoustical performance of the wall system. To prevent this issue the interior surfaces of the wall will need to be covered with sound absorption. Figure 5.3 shows the sound pressure level contours with a 10 foot perimeter wall. The north and south walls covering the entrance gap between the perimeter walls are eight feet high. The 55 dBA contour is in about the same place as in Figure 5.1, the unmitigated Foam Quiet ball. The results for an eight foot perimeter wall are shown in Figure 5.4. The 55 dBA contour now extends across Myrtle and Maple Drives and farther into the open space south of Satinloaf Drive. The 10 foot perimeter wall most closely matches the existing conditions.
31 of 58 Spendiarian & Willis Acoustics & Noise Control LLC
12/15/2019
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