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7.B. - Page 126 Redwood City Chapter 6.Cumulative Impacts The air quality analysis provided in Section 4.4 is already cumulative in nature.According to the BAAQMD,if daily average or annual emissions of operational-related criteria air pollutants would exceed any of the applicable emissions thresholds,the project would result in a cumulatively considerable impact(Bay Area Air Quality Management District 2011).As described in Section 4.4, the construction and operational emissions associated with the project with the proposed modifications were estimated to be well below the significance thresholds.The cumulative health risks associated with TACs were also estimated to be well below the BAAQMD's thresholds. Therefore,the original project with the proposed modifications would not contribute to new cumulatively significant air quality emissions. The cumulative setting for noise analysis includes the project site and adjacent areas affected by noise from the facility itself and the principal roadways where the project will contribute new traffic (specifically Middlefield Road and Woodside Road).As described in Section 4.5 in this Addendum No. 2,noise levels around the Costco facility at present are not at levels above acceptable noise standards for adjacent uses and the proposed modifications would not substantially change existing noise levels.As described in Section 4.3 in this document,existing traffic noise levels from the cumulative effect of the original project,plus traffic from other completed cumulative projects since 2007 has resulted in increases of less than 3 dBA on locally affected roadway.The addition of the proposed modification traffic to existing cumulative traffic would result in increases in traffic noise of less than 1 dBA above the existing conditions along locally affected roadways.As to future cumulative traffic noise levels,the 2007 EIR evaluated 2020 cumulative conditions and found that impacts would be less than 3 dBA increase over then-existing conditions at affected locations except along Willow Street,but that project improvements of splitting traffic at Willow would result in increases less than 3 dBA for that street. Given that the analysis in this Addendum No. 2 includes additional cumulative projects not included in the 2007 EIR and due to the passage of time,the cumulative analysis in the EIR for the 2010 General Plan (City of Redwood City,2010b) for the year 2030 was utilized for consideration in this document.The EIR for the 2010 General Plan analyzed cumulative traffic noise levels along key roadways in the City for cumulative 2030 conditions and found that noise levels along Woodside Road between El Camino Real and Middlefield Road (as well as other segments)would increase by less than 3 dBA overall.The 2010 General Plan EIR did not analyze levels along Middlefield Road,but as described in Section 4.3 of this Addendum No. 2,the original Costco project plus the proposed modifications are expected to contribute less than 1 dBA of traffic noise and thus would not contribute considerably to any cumulative traffic noise impacts along Middlefield Road (less than significant impact). The cumulative setting for geology and soils includes all the development and infrastructure that have occurred in Redwood City in the past and would be expected to occur in the future. Past, present,and future development could be affected by geologic conditions resulting in ground shaking,landsliding,and expansion,which ultimately could result in significant impacts on the environment.However,similar to the project with the proposed modifications,past,present,and future projects have been and would continue to be required to comply fully with the California Building Code and to implement specific building techniques to minimize seismic damage. Additionally,as described in Section 4.7,impacts on geology and soils resulting from the proposed modifications would be site-specific.As such,the project with the proposed modifications would not have a new cumulatively considerable contribution to cumulative impacts related to geology and soils. The analysis of greenhouse gas emissions provided in Section 4.12 is already cumulative in nature. This document utilizes the draft BAAQMD GHG emissions threshold which is designed to account for Addendum No.2 to the Environmental Impact Report for September 2012 the Redwood City Costco Wholesale Project 6-3 ICF 00154.12