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at a residential property that exceeds the following exterior noise standards. The noise levels are based on a cumulative period of more than 30 minutes in any hour. Table 6. Santa Ana Noise Ordinance Noise Zone Noise Level Time Period 1 55 dB(A) 7:00 a.m.-1D:00 p.m. 50 dB(A) 10:00 p.m.— 7:00 a.m. Source: Santa Ana Municipal Code, §18-312. Noise emissions from one property that propagate onto an adjacent or nearby residential property and exceed these limits are deemed to be noncompliant with the Santa Ana Municipal Code. Noise emissions related to construction activities are exempt from the limits, provided the construction activities do not occur place between 8:00 p.m. and 7:00 a.m. on weekdays, including Saturday, or at any time on Sunday or a federal holiday. Analysis of New Hotel Construction The effect of construction noise impacts on nearby noise-sensitive neighbors is dependent on the location and nature of the construction activities. Depending on the construction activities and neighboring land uses, there is a potential for possible significance threshold exceedances related to the resulting construction activities, particularly in relation to residential communities. While noise from construction activities is exempt from the Santa Ana Municipal Code during daytime hours, noise from construction activities occurring during the nighttime hours (as detailed in the previous section) must comply with the established limits. Additionally, the potential for substantial temporary increases to the existing ambient conditions could be considered relative to CEQA guidelines. Construction typically involves the use of heavy machinery that can be a significant source of noise and, while often temporary, can result in significant impacts. Construction equipment commonly includes air compressors, backhoes, concrete trucks, cranes, dump trucks, excavators, graders, pavers, tractors/dozers, vibratory rollers, portable generators, and water trucks. Depending on the phase of construction, project construction typically involves a combination of these types of off-road and portable construction equipment. Assuming a typical construction plan, common types of construction equipment, and typical construction equipment sound levels published by resources such as the U.S. Federal Highway Administration, the Federal Transit Administration, and manufacturers, potential overall sound levels can be estimated. Accordingly, construction sound levels could range from approximately 75 to 90 dBA assuming typical receptor distances of 500 ft to 50 ft. Construction activities also may need to occur at night due to various limitations. Examples include concrete pours that need to occur when other construction is not happening or would impede traffic, accelerated construction needs to meet hotel demand that may come with the Olympics in 2028, roadway construction work that needs to occur at nighttime. The table below outlines general construction phasing and equipment assumptions employed to estimate approximate sound pressure levels (SPQ for common construction phases for a hotel use as generated in CalEEMod.19 It is anticipated that these sound pressure levels are above typical .1 California Air Pollution Control Officers Association (CAPCOA). California Emissions Estimator Model (CalEEMod®1 Version 2022.1. Available online at htti)s://www.caleemod.com/ . 13/14