2019-040 - Mainplace Mall Transformation

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City of Santa Ana Addendum to the MainPlace Mall Transformation Proiect Fashion Square Commercial Center Final EIR 5.7 NOISE Summary of Impacts Identified in the 1983 EIR Construction The 1983 EIR determines that development of additional uses on the site would generate additional noise in the local area due to demolition of existing on -site structures, construction activity, construction traffic and Project -generated traffic. Since construction activities are limited to daytime hours and there are no "noise sensitive" land uses immediately adjacent to the site, no adverse noise impacts were anticipated during construction of the Project. In addition, the 1983 EIR did not identify potentially significant impacts related to ground borne vibration from construction activities. Operation The 1983 EIR determines that operation of the Project would result in increased traffic noise from the Project -related vehicular trips. The EIR describes that a noise barrier on the west side of North Broadway would be constructed as a part of Caltrans' construction of the Broadway overpass. The 1983 EIR determines that this would mitigate any increase in traffic noise along Broadway resulting from Project traffic. The 1983 EIR also described that increased noise levels between 3 and 5 decibel (dB) would occur along Owens Drive (now Memory Lane) east of Main Street during the daytime hours when the proposed commercial uses would generate the majority of the traffic. The late night and early morning hour noise levels were not anticipated to substantially change. However, the 1983 EIR determined that a noise impact would occur at the residential uses on Owens Drive (Memory Lane) at Main Street during the daytime due to the 3 to 5 dB "noticeable" increase in noise. The 1983 EIR identified that the construction of a noise barrier along the east side of Main Street would not be feasible and the impact was identified as significant and unavoidable. Since certification of the 1983 EIR, the residential uses in this location have been replaced with office and commercial uses. No significant impact would have occurred with the existing office and commercial uses because they are not sensitive noise receptors. Summary of Impacts Identified in the 1996 Addendum Construction The 1996 Addendum determines that the proposed expansion would generate additional noise in the local area due to demolition of existing on -site structures, construction activities, construction traffic, and Project -generated traffic. However, the City of Santa Ana noise ordinance limits noise from construction that occurs outside daytime hours and because there are no noise sensitive land uses in the immediate vicinity of the site, construction noise impacts were determined to be less than significant. In addition, the 1996 Addendum did not identify potentially significant impacts related to ground borne vibration from construction activities. o;