AT&T EG46 Fox Hollow Road & Amazon Road Page 4 <br />PREDICTED NOISE LEVELS WITH MITIGATION <br /> <br />The following are the predicted noise levels with the mitigation implemented: <br /> <br />Receiving Property: West <br />Source Sound Level Distance To Building Noise Distance dBA Level <br />123 <br />Receiver Factor Control Factor <br />Discharge 80 dBA @ 23 feet 70 -15 -27 -10 28 <br /> <br />Intake 80 dBA @ 23 feet 70-22 -10 -10 38 <br /> <br />Exhaust 102 dBA @ 3 feet 70 -35 -27 40 <br /> Total 42 <br /> <br />Table Notes: <br />1. Building factor is plenum reduction / increase of building or interfering building element. <br />2. Noise Control is mufflers, silencers, or lined hoods. <br />3. Distance Factor = -10*LOG(Q)+20*LOG(R2/R1) for dBA or -10*LOG(Q)+20*LOG(R)+0.5 for LwA <br /> <br />Receiving Property: South <br />Source Sound Level Distance To Building Noise Distance dBA Level <br />123 <br />Receiver Factor Control Factor <br />Discharge 80 dBA @ 23 feet 200 -27 -19 34 <br />Intake 80 dBA @ 23 feet 200 -7 -10 -19 44 <br />Exhaust 102 dBA @ 3 feet 200 -35 -36 31 <br /> Total 45 <br /> <br />Table Notes: <br />1. Building factor is plenum reduction / increase of building or interfering building element. <br />2. Noise Control is mufflers, silencers, or lined hoods. <br />3. Distance Factor = -10*LOG(Q)+20*LOG(R2/R1) for dBA or -10*LOG(Q)+20*LOG(R)+0.5 for LwA <br /> <br />With the mitigation implemented, noise from proposed emergency generator will meet the 45 dBA <br />code at the nearest residential properties when in operation. <br /> <br />Please contact our office if you have questions or need further information. <br /> <br />Sincerely, <br />SSA Acoustics, LLP <br /> <br /> <br /> <br /> <br />Alan Burt, P.E. <br />AP <br />SSOCIATE ARTNER <br /> <br />AC <br />COUSTICAL ONSULTANT <br /> <br /> <br /> <br />