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' Operational Noise ' Implementation of the proposed project consists of a commercial building with a mix of retail, restaurant, and medical-office uses that will result in an increase in vehicular traffic along the roads located closest to the project site. According to ' the Traffic Impact and Parking Analysis prepared for the proposed project, three roadways will show increases in traffic volume. The three roadways are Harbor Boulevard, 1St Street, and McFadden Avenue. The proposed project is anticipated ' to increase the total traffic volume on Harbor Boulevard by approximately 1,600 vehicles per day with a majority of the project-related traffic traveling south on Harbor Boulevard toward McFadden Avenue and the remaining traffic traveling ' north towards 1St Street. This increase in traffic volume due to the proposed project will result in an increase in noise of approximately 0.1 dB CNEL. This level of noise increase would be imperceptible to the human ear, and therefore, ' will not result in a significant impact due to project related traffic volume increases. ' As the proposed project involves a commercial building and a subterranean parking facility, mechanical equipment associated with the building, including air conditioning units, condenser units, and fans will be used. The architectural plans ' for the proposed project indicate that 15 air conditioning units and 15 condenser units will be equipped on the roof of the building. The roof will consist of a 7 foot facade element and parapet, measured from the base of the roof, around the ' perimeter of the roof. The subterranean parking structure will require a mechanical ventilation system to evacuate the carbon dioxide when vehicle exhaust levels become too high. Sensors will be placed within the parking facility ' which will trigger the fans when exhaust concentrations exceed apre-determined level. The ventilation exhaust fan will be located in the northeast corner of the parking facility which will ventilate the exhaust fumes through vents installed on ' the north side of the main driveway. The exhaust ventilation system will operate during normal business hours expected to be from 7 a.m. to 10 p.m. Sound level data of the exhaust ventilation fan was obtained from the manufacturer and ' calculated to be 87 dBA at a distance of 3 feet from the ventilation discharge grille. The results of the mechanical noise analysis indicate worst case mechanical noise levels will be experienced at the southeast corner of the mobile home park, near the center of the project site. The worst case unmitigated mechanical noise level at ' this location will be approximately 47 dBA Ley, when the ventilation exhaust fan is operating. The existing block wall located between the project site and the mobile home park will provide a minimum 5 dB of noise reduction to the ' residents within the mobile home park. The mitigated mechanical noise level within the mobile home park is expected to be less than 42 dBA Lam. The mitigated noise level from the mechanical equipment proposed for this project is ' expected to be less than the measured ambient noise level at the project site, and it is expected to be less than the daytime noise ordinance level of 55 dBA L~ at all of the sensitive noise receptors adjacent to the proposed project site. Noise ' impacts due to the mechanical equipment is not anticipated for this project. 57 Initial Study/Mitigated Negative Declaration July 2008 ' Harbor Medical and Retail Center 7 5A 9 0