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-. Memorandum to: Kent Peterson Bituminous Roadways October 7, 2010 Page 4 -. I'he noise data collected from each of the four monitoring locations is provided in Table 2. The nighttime L50 values within Table 2 are based on the data collected from 6:00 am to 7:00 am at each location_ The daytime L50 values presented in Table 2 is the average L50 ofail hours of noise data collecred from 7:00 am until 5:00 pm a[ each location. Table 2: Noise Loca[ion and NAC�� Industrial #2 - Ind Old Dutch & Railrc N3 - Res End of Eustis Court #4 - Res St. Croix St. - Mid-I MPCA Nighttime Nighttime L50 dBA�2� L50 Standai 60.7 75 66.2 75 58.2 Daytime Da�aime L50 50 dBA�3� Standard 59.7 75 65.9 75 62.5 60 563 60 ( I): NAC = Noise Area Classification; Ind = Industrial Noise Arw; Res = Residrntiel Noise Area. (21: Nighttime L50 was calculated (rom noise data collected betw•een 6:00 am and 7:00 am. (3): Daytime L50 presented is the average LSQ from 12 hours of noise data collected from 7:00 am ta 5:00 pm. The monirored existing L50 Ievels from the four monitoring locations were used in conjunction ^ with the measured noise levels at the existing Bituminous Roadways Shakopee asphalt plant to calculate the future noise leveis at the noise mo��itoring locations. The potential future noise levels from [he proposed project at each noise monitoring location were calculated using �he following formula: dBAa;s„�« = 79.4 dB(A)2� — 20 logio(distance/20) Oncc the noise levels genera[ed by the proposed projeet were determined for each noise monitoring location, these values were then added to the existing monitored noise levels ro yield the predicred future noise Icvels. The following formula was used to calculate the summation of the eaisting noise with the new noise created by [he proposed project: FuturedBA= IOlog(10"":n��ad,viu� { ��,Yeo,vio>� The predicted future daytime noise levels under normal plant operations are presented in Table 3 for each of the four monitoring locations. Under normal operations the noise geoerated by [he proposed projcct would increase the noise levels at the four monitored locations by 0 to 0.2 dBA. An increase ofthis magnitude is not detectable by the human ear and suppons the conclusions presented in the EA W that the proposed project would not result in a significant increase in noise in areas adjacent to the project. Figure 3 presents the existing noise Icvds a[ each loe:ation as well as the predicted future noise levels a[ each location with the asphalt plant under normal operation. � l tN:!-Unun.iwe NV I]ao9 h xn0e CN�au�Nemo-101U-14M tlo;