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7.B. - Page 125 Redwood City Chapter 6.Cumulative Impacts would be mitigated to a level below significance with incorporation of the standard conditions of approval and mitigation measures described throughout this document.While the proposed modifications would result in less-than-significant impacts with mitigation,cumulative impacts could occur if the proposed modifications would result in a new cumulatively considerable contribution to impacts on a resource. The cumulative setting for traffic analysis includes the principal roadways where the project will contribute new traffic (specifically Middlefield Road and Woodside Road). The original project plus the proposed modifications will contribute traffic to these two main roadways. Cumulative projects will also contribute traffic to these roadways.As described in Section 4.3,the cumulative effect of the original project,plus traffic from other completed cumulative projects since 2007 on existing traffic levels has not resulted in exceedance of traffic level of service standards for these two main roadways.The addition of the proposed modifications to the existing cumulative traffic will also not result in exceedance of the traffic level of service standards.The 2007 EIR evaluated 2020 cumulative conditions of the original project and found that cumulative conditions would meet LOS standards with the exception of the Woodside Road/Middlefield intersection,but that project improvements to that intersection would improve conditions compared to 2020 without project conditions.Given that the current 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 also utilized for this document.The 2010 General Plan EIR identifies that,in 2030,Woodside Road between El Camino Road and US 101 would have LOS F conditions which would be a significant cumulative impact as it exceeds the CMP standard of LOS E.The 2010 General Plan EIR also found that,in 2030, Middlefield Road between Woodside Road and 5th Avenue would have LOS D (AM peak) and LOS E (PM peak) conditions,which would not meet the LOS standard of D for PM peak operations.As noted above,the original Costco project plus the proposed modifications would contribute traffic to both roadways. However,as discussed in Section 4.3 in this document,the proposed modifications would not change the amount of new trips on Woodside Road compared to that predicted in the 2007 FEIR for the original project.Thus the proposed modifications would not result in a new significant impact nor a substantially more severe impact on Woodside Road compared to that identified in the 2007 FEIR.Regarding Middlefield Road between Woodside Road and 5th Avenue, the current(Kittelson 2012) traffic analysis estimates that the 2012 existing two-way volumes on Middlefield Road east of Woodside is 2,423 vehicles/hour(PM peak hour).The 70 new trips from the new gas pumps would add approximately 3%to the traffic volumes on Middlefield Road.The General Plan EIR estimates that 2030 cumulative two-way PM peak traffic volumes for Middlefield Road east of Woodside Road will be 2,936 vehicles/hour.The 70 trips from the new gas pumps at the Costco would add approximately 2%to the identified 2030 cumulative volumes.It should be noted that the General Plan EIR cumulative analysis included a larger version of the Saltworks project than is currently expected and thus the GP EIR analysis may overstate cumulative traffic impacts. Policy BE-25.6 of the 2010 General Plan requires that the City's transportation impact fee program be used to adequately fund transportation improvements needed to accommodate new developments. Costco is required to contribute a transportation impact fee as part of the project as specified in Article 15,Section 18,248(A) of the City's municipal code. Given the limited scale of new trips from the new pumps and the payment of the transportation impact fee as part of the project, the contribution of the proposed modifications to the cumulative traffic impact along Middlefield Road would less than considerable (which equals a less than significant impact).As a result,the proposed modifications would not result in a new significant impact or a substantially more severe impact concerning cumulative traffic than the conclusions presented in the 2007 FEIR. Addendum No.2 to the Environmental Impact Report for September 2012 the Redwood City Costco Wholesale Project 6-Z ICF 00154.12