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4.8 Nolse Consistency Analysis As described under Impact 4.8-1, construction -related noise could negatively affect nearby sensitive receptors. However, with the implementation of mitigation measures MM4.8-1 though MM4.8-4, construction -related noise would be reduced. Sources of noise generated by implementation of the proposed project would include new stationary sources (such as rooftop heating, ventilation, and air conditioning [HVAC] systems for the residential and office uses). As discussed under Impact 4.8-2, these noise sources have the potential to impact sensitive uses located both on- and off -site. Mitigation measures MM4.8-5 though MM4.8-7 would reduce exterior noise levels affecting nearby sensitive uses to below the exterior noise standard of 65 dBA CNEL. The primary source of noise in the vicinity of the proposed project is traffic noise. As discussed in Impact 4.8-7, traffic generated by the proposed project would generate noise along nearby road segments; however, the increase attributed to the proposed project would not be substantial and would not affect nearby sensitive uses both on- and off -site. However, portions of the Transit Zoning Code (SD 84A and SD 8413) area are located within close proximity to the SARTC and the AT&SF rail line. As discussed in Impact 4.8-8, sensitive receptors may be exposed to noise levels from trains in excess of the desired exterior noise standard of 65 dBA CNEL and interior noise standard of 45 dBA CNEL. Implementation of mitigation measures outlined below would reduce noise levels but below the standards set by the City. For the reasons listed above, the proposed project is not consistent with Goal 1. City of Santa Ana Municipal Code The City of Santa Ana has also adopted a Noise Ordinance (Chapter 18, Article VI of the Santa Ana Municipal Code), which identifies exterior noise standards, specific noise restrictions, exemptions, and variances for sources of noise within the City. Section 18-311 of the Municipal Code designates the entire City as Noise Zone 1 for exterior and interior noises. Section 18-312 of the Municipal Code establishes exterior noise levels for residential land uses. The exterior noise standards established in the City's Noise Ordinance are identified in Table 4.8-7 (City of Santa Ana Noise Ordinance Exterior Noise Standards). If the ambient noise level is greater than the identified noise standards, the noise standard becomes the ambient noise level without the offending noise. TableOrdinance Noise Level That May Not Be Exceeded for More Than Exterior 7:00 A.M.-10.*00 P.M. N 6ise Stanclardi 10:00 P.M: 7.00 A.M. 30 minutes in any hour 55 dBA 50 dBA 15 minutes in any hour 60 dBA 55 dBA 5 minutes in any hour 65 dBA 60 dBA 1 minute in any hour 70 dBA 65 dBA Any time 75 dBA 70 dBA SOURCE: City of Santa Ana Municipal Code Section 18-312 In the event that the alleged offensive noise consists entirely of Impact noise, simple tone noise, speech, music or cry combination thereof, the specified noise limits are reduced by 5 dB(A) City of Santa Ana Transit Zoning Code (SD 84A and SD 84B) EIR 4.815