AT&T EG46 Fox Hollow Road & Amazon Road <br />PREDICTED NOISE LEVELS - WITH MITIGATION <br />The following are the predicted noise levels with the mitigation implemented: <br />Receiving Property: West <br />Page 4 <br />Source <br />Sound Level <br />Distance To <br />Receiver <br />Building <br />Factor' <br />Noise <br />Control <br />Distance <br />Factor3 <br />dBA Level <br />Discharge <br />80 dBA @ 23 feet <br />70 <br />-15 <br />-17 <br />-10 <br />38 <br />Intake <br />80 dBA 23 feet <br />70 <br />-15 <br />-17 <br />-10 <br />38 <br />Exhaust <br />102 dBA 3 feet <br />70 <br />-30 <br />-27 <br />45 <br />Total <br />46 <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 />Receiving ProDertv: South <br />Source <br />Sound Level <br />Distance To <br />Receiver <br />Building <br />Factor' <br />Noise <br />Control <br />Distance <br />Factor' <br />dBA Level <br />Discharge <br />80 dBA 23 feet <br />200 <br />-17 <br />-19 <br />44 <br />Intake <br />80 dBA 23 feet <br />.200 <br />-10 <br />-17 <br />-19 <br />43 <br />Exhaust <br />102 dBA 3 feet <br />200 <br />-30 <br />-36 <br />36 <br />Total <br />46 <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 />With the mitigation implemented, noise from proposed emergency generator will be very close to <br />the 45 dBA code at the nearest residential properties when in operation. <br />Please contact our office if you have questions or need further information. <br />Sincerely, <br />SSA Acousti S, LLP <br />Alan Burt, P.E. <br />ASSOCIATE PARTNER <br />ACOUSTICAL CONSULTANT <br />