75D - PH- MAIN PLACE TRANSFORMATION

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In urban settings, peak period average sound levels are generally within 1 to 2 dB of Community Noise Equivalent Level (CNEL) and Day -Night Noise Level (DNL) values. The CNEL descriptor requires that an artificial increment of 5 dBA be added to the actual noise level for the hours from 7:00 to 10:00 p.m. and 10 dBA for the hours from 10:00 p.m. to 7:00 a.m. Tile DNL descriptor uses the same methodology except that there is no artificial increment added to the hours between 7:00 and 10:00 p.m. Both descriptors give roughly the same 24-hour level with the CNEL being only slightly higher. For the purposes of this discussion, peak period sound levels are considered to be equivalent to DNL values. The City of Santa Ana General Plan Noise Element identifies the following standards and guidelines for land uses: Residential, low density Residential, medium density Residential, high density Schools Commercial, office Industrial Desirable Maximum CNEL or DNL 55 60 65 60 65 70 Maximum Acceptable CNEL or DNL 65 65 70 70 75 75 Using these guidelines, existing sound levels are considered to be generally consistent with the land uses in the area. Impacts As with the project proposed in the Fashion Square EIR, the proposed expansion modification will generate additional noise in the local area due to demolition of existing on -site structures, construction activities, construction traffic, and project -generated traffic. No pile driving activities will be associated with construction (pers. communication, Ron Brunswig, April 1, 1996). Because the City of Santa Ana noise ordinance (No. NS-1441) limits noise from construction that occurs outside daytime hours and because there are no noise sensitive land uses in the immediate vicinity of the project, construction noise impacts are considered less than significant and no mitigation is required. The Fashion Square EIR identified increases in traffic noise in the range of 3 to 5 dB along Memory Lane (then Owens Drive) within a couple hundred feet of Main Street as a result of the project. These increases corresponded to increasing the uses in the area from about 522,000 square feet of retail space to a total of 1,500,000 square feet of office space, 1,600,000 square feet of retail space, and 1,200 hotel guest rooms. The current project would add 8,000 square feet of restaurant space, a 70,000 square foot cinema, and 69,000 square feet of retail space for a total of 147,000 square feet. Increasing the existing retail floor area of 1,108,000 square feet by 147,000 square feet AMend= EIR for Ma1n Place/Santa Ana (ER06.033) April 4, 1 96 Page 17 10 Project( No. 96.066 75D-408