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CHAPTERFOUR Environmental Consequences and Mitigation <br />number of locomotives, and the future number of trains during a 24-hour period. The model <br />calculated the distance of the 65dBA contour and location of the moderate and severe impacts <br />zones within the 0.5-mile long noise envelope. Unlike noise generated from increasing <br />automobile traffic, train noise is not permanent. Normal background noise levels will resume <br />after the train crossing has completed each pass. A discussion of the railroad horn noise impacts <br />are summarized in the following text. <br />CR M. 8 Grade Crossing <br />The results from the railroad horn noise model at the proposed M.8 Road grade crossing are <br />shown in Figure 4-5, County Road M8/Railroad Grade Crossing Railroad Horn Noise Impact <br />Areas. .Receptors R1 and R3 will hear the railroad horn, but levels will be below "moderately <br />impact," as defined in Chapter 3, Table 3.1-6, Noise Levels Defining Impact for Transit Projects. <br />Receptor R4 will experience moderate noise impacts when the horn is sounded up to 4 times a <br />day. The predicted noise levels are estimated to increase 3 dBA, at these locations. Normal <br />background noise levels will resume after the train crossing has been completed. <br />Receptor R2 will experience a severe noise impact when the horn is sounded at the grade <br />crossing. The noise level during will increase by approximately 8 dBA, after which normal <br />background noise levels will resume. <br />No receptors at this location will exceed the HUD acceptability standard of 65 dBA for a <br />residence. Table 3.1-6, Category 2 shows the project noise impact exposure used to identify the <br />level of impacts based on an existing noise exposure level of 52 dBA. <br />Other residences located within a mile radius of the grade crossing will hear the train horn, but <br />will not be moderately or severely impacted by the horn noise. The noise levels will be well <br />below the 65 dBA threshold and will not require mitigation. <br />In addition to train horn noise, the locomotive and coal rail cars with generate noise with each <br />pass. Residences located within ahalf--mile radius of the tracks will hear train noise, but levels <br />will be less than moderate or severe impacts. The noise levels generated by the locomotive and <br />coal rail cars will be well below the 65 dBA threshold and will not require mitigation. Normal <br />background noise levels will resume after the train has passed the proximity of the residence. <br />CR 10 Grade Crossing <br />The results from the railroad horn noise model at the proposed CR 10 grade crossing are shown <br />in Figure 4-6, County Road 10/Railroad Grade Crossing Railroad Horn Noise Impact Areas. <br />Receptor R8 will hear the railroad horn, but the level will be below the "moderate impact." <br />Receptors R5, R6, R7, and R9 will experience moderate noise impacts when the horn is sounded <br />up to 4 times in a 24-hour period. The predicted increase in noise levels vary from 1 to 6 dBA <br />when the railroad horn is sounded. <br />Receptor R10 will experience a severe noise impact when the horn is sounded as the train passes <br />by the property. The noise levels will increase approximately 12 dBA, and exceed the 65 dBA <br />HUD standard. <br />4-40 <br />DBMS 595 <br />