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� Memorandurn to: Ken[ Peterson Bituminous Roadways October 7, 20] 0 Page 5 Table 3: Predicted total l Existing Location Da time L. N 1 59.7 #2 65.9 tl3 62.5 daytime noise levels i lant Noise Level Und� Normal Operations at 46. I 40.4 �r normal cond Toca1 Predicted Future Daytime Noise Levels The temporary crushii�g operation would create additional noise beyond the normal operational conditions. The crushing operation would be louder than the equipment in use at the plant under normal operations and would therefore add noise to the proposed project site. The noise levels created by the crushing operation were calculated for each of the four noise monitoring locations. These noise values were theo added to the predicted future noises levels of the combined existing noise plus the plant under normal operations. This returned a prcdicted future noise Icvel at each bcation with the addition of the proposed plant plus while the crushing operation is one si[e. There are two potehtial locations on [he projecl site for the mobile erushing opera[ions. The crusher would be located at each loca[ion for a portion of two to three week period the crusher is on site and in operation: The noise levels heard at a location are dependant on the distance f}om the noise source. As a result, for the calculations in "I'able 4 that predict the fwure noise levels at the monitoring locations during crushing, the crusher location that was closest ro each monitoring bcation was used for the calculation. This calculation would then provide the greatest possible increase in noise at a location due to the presence of the plant and the c�usher for future noise levels. Table 4: Location u�ai remcrea �urure aa tu Plant Noise Level Under Existing ivormal Daytime Operations at L50 each Location 59.7 46.1 65.9 44.2 62.5 41.3 563 40.4 levels site Crusher Noise L.evel at each I.0 Total Predicted Future Daytime oise Leve 61.6 66.6 62.9 The noise generatecl by the proposed project during crushing operations will result in a 0.5 to 1.9 dBA increase to the existing noise levels a[ the four monitored locations near the project site. Based on MPCA noise guidance, a I dBA increase is not detectable by the hinnan ear and a 3 d8A inaease is considered [he threshold of perccption (A Gurde io Norse Contru! in rLlinnesom; MPCA, 2008). As a result, the small increases in noise created by the proposed T ll42�-p�vnwuus 0.\I 1}WJ 0.o,µn�lle fl�.\pifey�em.o.141616D5Cx .� .... �/