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7.B. - Page 89 Redwood City Chapter 4.Environmental Impact Analysis volumes. 3 The 2012 Existing with Project with Proposed Modifications scenario adds 70 peak hour trips on Middlefield(20 new+50 diverted). 4 The 2012 Existing with Project with Proposed Modifications scenario adds 20 peak hour trips on Woodside. s The 2012 Existing without Project scenario subtracts 260 peak hour trips on Middlefield(80 net+180 diverted). 6 The 2012 Existing without Project scenario subtracts 80 peak hour trips on Woodside. Source:ICF 2012,Appendix C. b. Cause exposure of persons to orgeneration of excessivegroundborne vibration orgroundborne noise levels? Less-than-Significant New Impact.Construction activities associated with the proposed modifications would not involve high-impact noise generating activities such as pile driving. Vibration from nonimpact construction activity and truck traffic is typically below the threshold of perception when the activity is more than about 50 feet from the receiver(Federal Transit Administration 2006). Because the proposed modifications would not involve high-impact equipment and the construction site is more than 50 feet from the nearest noise-sensitive land uses, new impacts would be less than significant. c. Cause a substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? Less-than-Significant New Impact.As discussed in Section 4.5.a,operation of the project plus the proposed modifications would result in a noise level of less than 50 dBA Leq,which is below existing background noise levels at the closest residential neighborhoods,and consistent with the City's goal and policies of reducing potential noise impacts.Therefore,new impacts resulting from the operation of the proposed modifications would be less than significant. d. Cause a substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? Less-than-Significant New Impact.As discussed in Section 4.5.a,the peak noise level generated by the construction of the proposed modifications is expected to be less than 69 dBA at the closest residential neighborhood.Construction activities would likely be intermittent and of short duration, so average noise levels (Leq and CNEL) at the residential neighborhoods would be lower than the peak noise levels.The ambient noise levels in the project area range between 61 and 71 CNEL; therefore,the proposed modifications would not result in a substantial temporary increase in ambient noise levels in the project area.New impacts would be less than significant. e. For a project located within an airport land use plan or, where such a plan has not been adopted, within 2 miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? No New Impact.The project site is well outside any aircraft noise impact zone.The nearest airport is the San Carlos Airport,located approximately 3 miles northwest of the site in San Carlos.Aircraft noise from this airport does not affect the project site.No new impact would occur. Addendum No.2 to the Environmental Impact Report for 4-44 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12