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vicinity are identified on Table 3.6-4. The model used for preparing the noise contours <br /> incorporates assumptions regarding average daily traffic volumes, the percentage of <br /> trucks, and the average speed. The model assumes no blockage of line-of-sight between <br /> roadway and observer. <br /> Sensitive Receptors <br /> Land uses such as housing, religious, educational, convalescent, and medical <br /> facilities are more sensitive to noise than commercial and industrial uses. The nearest <br /> residential area lies within 400 feet of the southern fence line of the proposed quarry <br /> site. About 12 homes lie within this distance, with the nearest home approximately 300 <br /> feet from the fence line. Additionally, a zoned residential area, currently with no homes <br /> on it, is located about 200 feet from the southwestern fence line. An approximately 50- <br /> foot high bluff and several mature oak trees separate the existing residential area from <br /> the proposed site. The nearest school is located about 1,500 feet from the western fence <br /> line. <br /> As discussed above, State Route 88 is designated by the County as a "critical' <br /> noise route. Many of the homes within 400 feet of the fence line of the proposed <br /> quarry site, as well as the school, are located within the 65 dBA CNEL noise contour of <br /> State Route 88 (Table 3.6-4), and a few are even within the existing 70 dBA CNEL <br /> contour. <br /> The area around the processing facility is sparsely populated. The nearest <br /> residence to the processing area is about 1,600 feet north; however, there are several <br /> homes along Jahant Road that are affected by truck traffic associated with existing <br /> operations. As mentioned above, Jahant Road is designated as a "problem" noise route. <br /> 3.6.2 Impacts <br /> Noise from Extraction Activities <br /> Noise from quarry activities would include engine and operation noise from the <br /> loader and haul trucks. A low and high range of measured noise levels (Golen et. al., <br /> 1979) for these vehicles were combined to use for assessing noise impacts. The <br /> combined noise levels would range from a low of 73.5 dBA (Leq) to a high of 80 dBA <br /> 86 <br />