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u As the proposed project involves the operation of a commercial building, vehicles will be entering and exiting the site during the daytime operating hours to access the retail, restaurant, and medical-offices anticipated to be occupying the building. The retail, restaurant, and medical-offices tenants that will occupy the building are also anticipated to receive deliveries of supplies, maintenance, and other deliveries related to the day-to-day operations of the individual businesses. As a result, the activities associated with day-to-day operations are anticipated to generate noise with vehicular traffic in and around the site. This includes noise associated with vehicle engine start-ups, vehicle doors, horns, and noise associated with vehicles driving through the parking facility including the subterranean parking facility. Typical parking facility noise levels associated with common activities in parking facilities are presented in Table 9. Table 9 -Common Parking Facility Noise Level Noise Source Ran a (dBA L,,,ax) Car startin at 10 feet 53 - 66 Car drivin b at 10 feet 58 - 66 Car drivin at 15 feet 55 - 63 Car door closin at 10 feet 60 - 67 Car trunk closin at 10 feet 43 - 52 Car door o enin at 10 feet 48 - 58 Car en ine shut off at 5 feet 52 - 60 Source: Noise Stud Re ort, URS Cor oration. Existing noise barriers around the perimeter of the project site will reduce the noise levels from parking lot activities by a minimum of 5 dB and a wall with a height of 6 feet can provide approximately 8 dB of noise reduction. The noise levels expected to be experienced by the existing residences adjacent to the proposed project will be less than the values listed in the table above. Furthermore, the noise levels associated with the parking facility of the proposed project should not exceed the noise values and time durations, previously mentioned above, of the City of Santa Ana Noise Ordinance. To further reduce noise levels associated with the parking facility of the proposed project, the following provisions shall be agreed upon by the tenants and visitors of the building. • No deliveries will be allowed before 7 a.m. or after 10 p.m. • Loitering shall be prohibited in the parking lot before 7 a.m. or after 10 p.m. • Delivery vehicle engines shall be shut down when the vehicles are parked. Furthermore, the parking facility has been designed to maintain traffic flow in one direction. Signs and direction arrows will signal the direction of movement within the parking facility and will contribute to the efficient movement of vehicles maneuvering through the site. The vehicle movement will also allow trucks and commercial vehicles to travel in a forward direction within the parking facility thereby reducing sound-emitting safety beepers associated with these vehicles shifting into reverse gear. 58 Initial Study/Mitigated Negative Declaration July 2008 ' Harbor Medical and Retail Center 7 5A 91