6 - GPA19-01; AA19-01_651 W SUNFLOWER AVENUE

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Legacy Sunflower Apartments Page 67 Mitigated Negative Declaration – March 14, 2019 Dozers 77-90 85 Scrapers 83-91 87 Haul Trucks 83-94 88 Cranes 79-86 82 Portable Generators 71-87 80 Rollers 75-82 80 Tractors 77-82 80 Front-End Loaders 77-90 86 Hydraulic Backhoe 81-90 86 Hydraulic Excavators 81-90 86 Graders 79-89 86 Air Compressors 76-89 86 Trucks 81-87 86 The existing school adjacent to and north of the site as well as the multi-family developments east, south (The Enclave), southwest (Avenue of the Arts) and west of the project may be temporarily affected by short-term noise impacts associated with project construction activities including workers commuting to the site, delivery of construction materials, demolition, ground clearing, excavation, grading, and building activities. However, construction noise would be acoustically dispersed throughout the project site and not concentrated in one area near surrounding sensitive uses. The City’s Noise Ordinance does not establish quantitative construction noise standards. Rather, the Noise Ordinance establishes allowable hours of construction. Section 18-314 of the Santa Ana Municipal Code exempts noise associated with construction, repair, remodeling, or grading of any real property from the noise limitations of the Municipal Code, provided that construction activities do not take place between the hours of 8:00 PM and 7:00 AM on weekdays, including Saturday, or any time on Sunday or federal holidays. All project construction activities would be required to comply with the Santa Ana Municipal Code Section 18-314. A likely worst-case construction noise scenario was calculated using the Federal Highway Administration's Roadway Construction Noise Model (RCNM). The construction equipment used was based on the project’s Air Quality and Greenhouse Gas Impact Analysis default construction equipment list that is identified in the CalEEMod modeling (Ganddini Group, Inc., 2019). Demolition The noise modeling for the demolition activities included the use of two (2) dozers, three (3) excavators, and a concrete saw all operating between 15 and 200 feet from the northern property line. The existing concrete wall along the project’s eastern boundary and the wall along the northern property line of the multi-family development (The Enclave) south of Sunflower Avenue would provide 5 dB of noise reduction, which was accounted for in the noise modeling. The noise levels at the adjacent surrounding noise sensitive land uses during project demolition are shown in Table 12. 6-89