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Decatur Northwest 1, LLC <br /> Decatur Northwest 1 Commercial Solar Energy Facility,Decatur, IL <br /> Figure 2 Nighttime Noise Modeling Results <br /> ! <br /> :Hilt* <br /> 1 a f . ... <br /> f it dEUI• /G d8) {AST 15RL6 , t <br /> ) • <br /> , <br /> :: Y <br /> >' it N <br /> ,,,,.-..•p. ,,'"-'"'''4., ,H,,,,\\..,_._„ - . <br /> '::I. <br /> v )4: . ,.....:,,,...:„...s. i.....,, .,,,,,,,,,,, - 'A um - <br /> Al41/41 <br /> w.. <br /> -- :' ..0.:::... <br /> _ _ i <br /> y..a - ! ' <br /> ^- ' •�• e l <br /> N dBA , .�' f.. <br /> -4,......46: - T?S_ <br /> • i:3 s. <br /> ' •'... 4' -gal � <br /> rrort,-,, f* .. <br /> s$� ''1 { <br /> ..--.._...... t. 1 -t -.._ _ .,z .l}fit' <br /> VP <br /> The results presented above demonstrate that the predicted noise levels generated by Project sources will <br /> be well below the most limiting Illinois Pollution Control Board sound emission standards at sensitive <br /> residential receptors and the Macon County noise ordinance levels.The only increase to baseline <br /> observed was at R1,the closest residential receptor during the daytime, with a predicted increase of 1 <br /> dBA. This is a negligible increase above the FTA estimated baseline level of 50 dbA but below the values <br /> of the applicable noise standards. The Macon County noise ordinance also has a subjective component <br /> that the noise source should not be audible at 300 ft from the source during the daytime and 100 ft from <br /> the source during the nighttime.Audible is a difficult standard to describe with sound levels as it is <br /> subjective based on people's perception.Based on the FTA estimated baseline,it is not likely to be more <br /> audible than the baseline based on the negligible amount above the surrounding environment for the one <br /> daytime location of Rl and no increase for any other receptors.However, if there are any pure tones <br /> associated with the equipment at specific octave bands,this could make people more sensitive to the <br /> sound being emitted from the inverters and transformers. <br />