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City of Santa Ana <br />California Environmental Quality Act <br />Initial Study/Mitigated Negative Declaration <br />Construction will take place between the hours of 8:00 AM until 5:00 PM Monday through Friday. The <br />Santa Ana Municipal code has exemptions for Noise listed in Chapter 18.3, which includes <br />construction. Construction hours are limited to Monday through Friday from 7:00 am to 5:00 pm, <br />excluding holidays and weekends, unless approved otherwise by the City. The City's Municipal Code <br />also states that noise levels must meet the criteria based on land use, as depicted in Table 3-2. The <br />entire City of Santa Ana is designated as "Noise Zone 1". <br />Table 3-2 City of Santa Ana Land Use Guidelines for Exterior Noise <br />Noise Zone <br />Allowable Noise Level <br />Time Period <br />1 <br />55 dBA <br />7:00 a.m. - 10:00 p.m. <br />1 <br />50 dBA <br />10:00 p.m. - 7:00 a.m. <br />As shown in Table 3-3, the Federal Highway Administration (FHWA) identified predicted noise limits <br />at a reference distance of 50 feet. By utilizing these values, noise levels at nearby sensitive receptors <br />can be calculated and predicted. <br />Table 3-3 Construction Equipment Noise Emission Levels <br />Equipment Description <br />Lmax Noise Limit at 50 feet., dB <br />Slow <br />Is Equipment an Impact <br />Device? <br />All other equipment > 5HP <br />85 <br />No <br />Backhoe <br />78 <br />No <br />Compactor (ground) <br />83 <br />No <br />Compressor (air) <br />78 <br />No <br />Concrete Mixer Truck <br />79 <br />No <br />Concrete Saw <br />90 <br />No <br />Crane <br />81 <br />No <br />Dozer <br />82 <br />No <br />Dump Truck <br />76 <br />No <br />Excavator <br />81 <br />No <br />Flat Bed truck <br />74 <br />No <br />Front End Loader <br />79 <br />No <br />Generator <br />81 <br />No <br />Impact/Vibratory Pile Driver <br />101 <br />Yes <br />Jackhammer <br />89 <br />Yes <br />Mounted Impact Hammer <br />90 <br />Yes <br />Pavement Scarifier <br />85 <br />No <br />Pumps <br />81 <br />No <br />Roller <br />80 <br />No <br />Sand Blasting (single nozzle) <br />96 <br />No <br />Slurry Trenching Machine <br />80 <br />No <br />Vacuum Street Sweeper <br />82 <br />No <br />Welder / Torch <br />74 <br />No <br />