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7.B. - Page 87 Redwood City Chapter 4.Environmental Impact Analysis Impact Discussion As discussed below,the proposed modifications to the project would not result in any new or more severe significant noise impacts beyond those previously addressed in the 2007 FEIR and 2007 Addendum No. 1,and there are no other changes in circumstances,or new information that would necessitate any major modification of the noise discussions in the 2007 FEIR and 2007 Addendum No. 1. Would the project: a. Expose persons to orgenerate noise levels in excess of standards established in the local general plan or noise ordinance,or applicable standards of other agencies? Less-than-Significant New Impact. Construction staging would occur on the project site and all construction activities would be limited to weekday daytime hours between 7 a.m.and 3:30 p.m.As analyzed in the 2007 FEIR (page 4.6-4), the construction of the Costco warehouse and fueling center was estimated to generate a peak noise level of approximately 75 dBA at 300 feet from the source.The project site is located farther away from the closest residential neighborhoods (600-750 feet) and would have a smaller scale of construction than the construction of the Costco Warehouse and Tire Station in 2009.Therefore,the peak noise level generated by project construction is expected to be less than 69 dBA at 600 feet from the source,given a noise attenuation rate of 6 dB per doubling of distance.The construction noise would be well below the City`s noise ordinance limit of 110 dBA,and construction equipment would utilize available noise suppression devices,where feasible,to be consistent with Policies PS- 13.6 and PS-13.8 in the General Plan. In addition,the construction activities would be limited to daytime hours for a short period of time (7 weeks). Consequently,new construction noise impacts would be less than significant. The fueling center operates between the hours of 6 a.m.and 9:30 p.m.on weekdays,and between the hours of 6 a.m.and 7 p.m.on weekends.As analyzed in the 2007 FEIR(page 4.6-7),the operation of the 16-station fueling center was estimated to generate a noise level of 50 dBA Leq or less at the closest residential areas.With the exception of a change in traffic noise levels,the operational nature of the activities at the existing fueling center would remain the same,therefore the increase in operational noise at these residential neighborhoods would be negligible because the noise level would be well below existing background noise levels,which is dominated by traffic noise sources on adjacent local streets.As such,the project would not conflict with Policies PS-13.3, PS-13.4,and PS-13.5.Therefore,new noise impact associated with the operation of the project plus the proposed modifications would be less than significant. As analyzed in the 2007 FEIR(page 4.6-8),the operation of the Costco warehouse and fueling center was estimated to result in a traffic noise increase of less than 1 dBA on adjacent streets for which the traffic noise levels were greater than 60 dBA CNEL.The 2007 FEIR estimated the originally approved project would result in 80 diverted trips (which would affect traffic noise along Middlefield Road) and 80 net new trips (which would affect noise along Woodside Road and Middlefield Road).As described in Table 4.3-3 above,the previously approved project plus the proposed modifications is estimated to result in 230 diverted trips (which would affect noise along Middlefield Road) but only 80 net new trips overall (which would affect noise along Woodside Road and Middlefield Road).Thus,the project with the proposed modifications would result in 20 new trips along Woodside Road compared to 2012 existing conditions,but no change from what was Addendum No.2 to the Environmental Impact Report for 4 4Z September 2012 the Redwood City Costco Wholesale Project ICF 00154.12