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7A Page 48 Site planning to minimize noise in shared residential outdoor activity areas by locating the areas behind the buildings, in courtyards, or orienting the terraces to alleyways rather than streets, whenever possible; Air conditioning in ail units so that windows can remain closed to maintain interior noise levels below 45 dBA CNEL; and Sound-rated windows and construction methods in residential units proposed along streets (or the Caltrain iii.e) where ..Disc levels Would exceed /0 dB CNEL. Noise levels at residential property lines around Plan-facilitated development should be maintained at an Leq not in excess of 60 dBA during the daytime hours and 50 dBA during nighttime hours (10:00 PM to 7:00 AM), unless ambient noise levels are higher. In those cases, the ambient noise level would be the noise level standard. The approval of future commercial projects near Precise Plan area residential and other noise-sensitive uses may, at City discretion, require a noise study demonstrating how the project--including associated loading docks, refuse areas, and ventilation systems--would meet these standards. Finding: Implementation of these measures to the satisfaction of the Redwood City Building Department would reduce the potential impact on new residential uses to a less than significant level. Vi. AlR QUALITY A. Air Quality !mpacts Impact 12-1: Construction-Related Air Quality (mpacts. Demolition or construction activities permitted and/or facilitated by the proposed Downtown PreC;ISe Plan under both the Maximum Intensity and Moderate Intensity alternatives may generate construction-period exhaust emissions and fugitive dust that could temporarily but noticeably affect local air quality. This would represent a potentially significant impacf {see criteria 2, 4, and 5 in subsection 12.3.1, "Significance Criteria," above). Mitigation 12-1. For all discretionary grading, demolition, or construction activity in the Precise Plan area, require implementation of the following dust control measures by construction contractors, where applicable: During demolition of existing structures: • Water active demolition areas to control dust generation during demolition of structures and break-up of pavement. • Cover all trucks hauling demolition debris from the site. • Use dust-proof chutes to Toad debris into trucks whenever feasible. During all construction phases: • Water all active construction areas at least twice daily. Atty/Reso/Reso.1683 2g 030707