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<br />Legacy Sunflower Apartments Page 68 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />Table 12 <br />Demolition Noise Levels <br /> <br />Location Leq Lmax <br />Playfields at school adjacent to the northern <br />property line <br />88.8 92.1 <br />Residential adjacent to the eastern property line 72.2 74.2 <br />Residential property line 140 feet to the south 66 69 <br />Residential property line 145 feet to the west 72.6 75.6 <br />Residential property line 225 feet to the southwest 67.9 71 <br /> <br />Grading <br /> <br />The noise modeling for the on-site grading activities includes the use of a grader, a tractor, an <br />excavator, a front-end loader, a dozer and a backhoe with all pieces of equipment operating between <br />25 and 350 feet from the project property line. The existing concrete wall along the project’s eastern <br />boundary and the wall along the northern property line of the multi-family development (The Enclave) <br />south of Sunflower Avenue would provide 5 dB of noise reduction, which was accounted for in the <br />modeling. The noise levels at the adjacent surrounding noise sensitive land uses during project <br />grading are shown in Table 13. <br /> <br />Table 13 <br />Project Grading Noise Levels <br /> <br />Location Leq Lmax <br />Playfields at school adjacent to the northern <br />property line <br />87.3 91 <br />Residential adjacent to the eastern property line 82.3 86 <br />Residential property line 140 feet to the south 67.8 69.6 <br />Residential property line 145 feet to west 72.6 74.4 <br />Residential property line 225 feet to the southwest 69.7 71 <br /> <br />Although construction noise would have a temporary or periodic increase in the ambient noise levels <br />above the existing within the project vicinity, all construction noise would occur during the hours allowed <br />by Santa Ana Municipal Code Section A-314. Therefore, construction-related noise impacts are <br />considered less than significant. However, to be conservative and reduce construction noise levels at <br />the nearest sensitive receptors as much as feasible, the following construction noise mitigation <br />measures are recommended. <br /> <br />Mitigation Measure No. 2 During all project site excavation and grading on-site, construction <br />contractors shall equip all construction equipment, fixed or mobile, with <br />properly operating and maintained mufflers, consistent with manufacturer <br />standards. <br /> <br />Mitigation Measure No. 3 The contractor shall place all stationary construction equipment so that <br />emitted noise is directed away from the noise sensitive receptors nearest <br />the project site. <br /> <br />Mitigation Measure No. 4 Equipment shall be shut off and not left to idle when not in use. <br /> <br />6-90