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Chapter 4 Environmental Setting, Impacts, and Mitigation Measures Threshold If the project is located within the vicinity of a private airstrip, would it expose people residing or working in the project site to excessive noise levels? The Transit Zoning Code (SD 84A and SD 8413) area is not located within the vicinity of a private airstrip. Thus, no impact related to the exposure of people residing or working in the project site to excessive airstrip -related noise levels is anticipated, and no further analysis is required in this EIR. Effects Found to Be Less Than Significant Threshold Would the project result in the exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? Impact 4.8-1 Construction activities associated with the proposed project would generate noise levels that exceed the noise standards established by the City of Santa Ana Municipal Code. This is considered a potentially significant impact. Implementation of mitigation measures MM4.8-1 through MM4.8-4 would reduce this impact, but noise levels could still be substantial. However, the project's construction noise impacts would be temporary and would be consistent with the exemption for construction noise that exists in the Municipal Code. Therefore, this impact would be considered less than significant. The proposed project has the potential to result in events that may exceed permitted noise levels. The primary sources of noise associated with the proposed project would be construction activities and project -related traffic volumes. Secondary sources include increased human activity throughout the sites. Noise limits for sensitive uses established in Section 18-311 and 18-312 of the Santa Ana Municipal Code are shown in Table 4.8-7 and Table 4.8-8. Development of projects under the Transit Zoning Code (SD 84A and SD 8413) would require the use of heavy equipment for demolition, site excavation, installation of utilities, site grading, paving, and building fabrication. Construction activities would also involve the use of smaller power tools, generators, and other sources of noise. During each stage of construction there would be a different mix of equipment operating, and noise levels would vary based on the amount of equipment in operation and the location of the activity. The EPA has compiled data regarding the noise generating characteristics of specific types of construction equipment and typical construction activities. These data are presented in Table 4.8-9 (Noise Ranges of Typical Construction Equipment) and Table 4.8-10 (Typical Outdoor Construction Noise Levels). These noise levels would diminish rapidly with distance from the construction site at a rate of approximately 6 dBA per doubling of distance. For example, a noise level of 86 dBA measured at 50 feet from the noise source to the receptor would reduce to 80 dBA at 100 feet from the source to the receptor, and reduce by another 6 dBA to 74 dBA at 200 feet from the source to the receptor. 4.8-20 City of Santa Ana Transit Zoning Code (SD 84A and SD 848) EIR