ZB 22 13 Acoustal Evaluation

Mr. Lawrence BenBassett -4- 30 March 2023 4.2 Rooftop HVAC The following rooftop equipment and associated manufacturers’ sound data was included in the acoustical model for each building, assumed to be located towards the middle of each roof. A 3 foot tall parapet was included for each roof.  Two Rooftop Units (RTU) – 82 dB(A) sound power level  Two Kitchen Exhaust Fans (KEF) – 76 dB(A) sound power level  One Bathroom Exhaust Fan – 65 dB(A) sound power level If louder equipment is selected, equipment is located toward the south of the roof, or a lower parapet is used, additional noise control measures may be required such as roof screening or equipment reselection with low-noise options. 5.0 RESULTS Table 2, below, shows the expected A-weighted sound levels due to the simultaneous operation of the proposed mechanical equipment and the drive-thru intercom loudspeakers. The results are compared to the average ambient sound levels measured on site, and to the applicable limits of the NJDEP noise regulation. Table 2 – Expected A-weighted Sound Levels due to Mechanical Equipment and Drive-Thru Intercoms, 470 Eagle Rock Avenue, West Orange, New Jersey. Location Sound Level, dB(A) Expected Limit 1 43 50 2 48 50 3 47 50 Average Measured Ambient Sound Level, dB(A) 52 Figure 2, at the end of this letter, shows the expected octave band sound pressure levels at the nearest residential property lines due to the proposed mechanical equipment and intercom loudspeakers, compared to the applicable limits of the NJDEP noise regulation. The results of the evaluation indicate that the sound levels due to the mechanical equipment and intercom loudspeakers are expected to meet the applicable limits of the NJDEP noise regulation at the nearest property lines with the recommended maximum equipment sound levels.