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City of Santa Ana Addendum to the <br />MainPlace Mall Transformation Project Fashion Square Commercial Center Final EIR <br />DG - 141 Open space should be sheltered from the noise and traffic of adjacent <br />streets or other incompatible uses. <br />DG - 219 Parking lot landscaping should contribute to minimizing environmental <br />impacts such as noise, light, and exhaust. <br />Additionally, the Specific Plan allows minor modifications to any of the development <br />standards or regulation for noise attenuation purposes, such as modification of wall <br />heights. Therefore, with compliance to Specific Plan Design Guidelines and to the City's <br />existing noise regulations, which would be verified through the City's development <br />permitting process, impacts related to onsite sensitive noise receptors during operation <br />would be less than significant. No new impact would occur. <br />Offsite Sensitive Receptors <br />Although the Project site is within the City of Santa Ana, the closest offsite sensitive <br />receptors are residences 300 feet to the north and 300 feet to the east that are within <br />the City of Orange. The City of Santa Ana's stationary source exterior noise standard is <br />65 dBA and the City of Orange's stationary source exterior noise standard is 55 dBA. <br />Mechanical Equipment <br />Mechanical equipment (e.g., heating ventilation and air conditioning [HVAC] equipment) <br />typically generates noise levels of approximately 50 to 60 dBA at 50 feet. Mechanical <br />equipment would be located more than 300 feet from the closest offsite receptors. <br />Conservatively, at 300 feet, mechanical equipment noise levels would be reduced to <br />44.0 dBA based on distance attenuation. This noise level is below the City of Orange's <br />55 dBA exterior standard and would not be perceptible because existing ambient noise <br />levels are between 64.4 to 72.1 dBA (refer to Table N-5). Thus, operation of mechanical <br />equipment would not increase ambient noise levels and would not generate noise in <br />excess of standards. Therefore, the proposed Project would result in a less than <br />significant impact related to noise from mechanical equipment. No new impact would <br />occur. <br />Delivery Trucks and Loading/Unloading Noise <br />Typical deliveries occur during daytime hours. During loading and unloading activities, <br />noise would be generated by the trucks' diesel engines, exhaust systems, and brakes <br />during low gear shifting' braking activities; backing up toward the docks/loading areas; <br />dropping down the dock ramps; and maneuvering away from the docks. <br />Loading/unloading activities would occur at various locations throughout the site. <br />Typical heavy truck operations generate a noise level of 68 dBA at a distance of 30 feet. <br />The closest offsite residences would be located approximately 300 feet north and east <br />of the Project site (across SR-22 and Main Street). These offsite residences would <br />experience truck noise levels of approximately 48 dBA, which is below the City of <br />Orange's 55 dBA exterior standard and below existing ambient noise levels of between <br />64.4 to 72.1 dBA (refer to Table N-5). Noise levels below the existing ambient levels <br />would not result in a noticeable noise increase. As noise levels associated with trucks <br />e] <br />