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78 ATTACHMENT 4 Page 38 other earthmoving activities. Additionally, construction noise also results from machinery and equipment used in the process of constructing the new housing facility. There is a possibility that the project may expose persons to or generate noise levels in excess of standards established in a local general plan or noise ordinance or other applicable standards of other agencies. (IS/MND Impact 11- a, pp. 3-58, 3-69, 3-60). Potential Impact 11-d: Construction activities have the potential to exceed Redwood City's exterior noise standard of 60 dBA within about 1,500 feet of construction activity. There is a potentially significant impact from construction noise to people residing or recreating in the project vicinity. Project construction would result in a temporary increase in ambient noise levels. (IS/MND Impact 11-d, p, 3-61). Mitigation Measure N-1: The following noise-control measures would be included in the construction contract specifications to reduce and control noise generated from construction, demolition, and renovation-related activities. . The normal working day for construction activities will be between 7 am and 7 pm on weekdays. . Construction equipment will have appropriate mufflers, intake silencers, and noise-control features, and would be properly maintained and equipped with exhaust mufflers that meet state standards. . Vehicles and other gas- or diesel-powered equipment will be prohibited from unnecessary warming up, idling, and engine revving. . A sign will be posted at the construction site giving the name and telephone number or e-mail address of the District staff member whom the public should contact with any noise complaints. This information will also be available on the District website. If necessary due to complaints, the construction contractor will provide noise-attenuating measures such as additional mufflers or engine shrouding. Because there are not residents adjacent to the project site, the topography provides a noise buffer, and the project site would be de-annexed from Woodside and incorporated into Redwood City. (MMRP Mitigation N-1). Finding: The higher elevation of the project site and the surrounding wooded hillside would provide a noise buffer, which would reduce the construction noise impacts of both 11-a and 11-d. These potential impacts would be further reduced to a less-than significant fevel with implementation of Mitigation Measure N-1. G. TRANSPORTATION AND TRAFFIC 1. Impacts on Transportation and Traffic Potential Impact 15-a and 15-b: Construction and operation of the proposed project would generate additional traffic on regional and local