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7.B. - Page 118 Redwood City Chapter 4.Environmental Impact Analysis BAAQMD's approachg to addressing project-level and cumulative impacts associated with climate change is to identify emissions levels below which an individual project would not be expected to substantially conflict with existing California legislation enacted to reduce statewide GHG emissions. If a project is anticipated to generate GHG emissions above the relevant threshold,BAAQMD considers that it would contribute substantially to cumulative impacts and therefore should be considered significant.For stationary source projects requiring a District Permit to Operate (as does the Costco fueling center),BAAQMD recommends a threshold of 10,000 metric tons per year COae (Bay Area Air Quality Management District 2011).However,the source of GHG emissions from this project is not the stationary source aspect; fuel station emissions are volatile organic compounds, such as benzene,which are not considered GHG emissions.The sources of GHG emissions from this project are the increased vehicle trips and changes in vehicle queuing. For land use projects, wherein transportation-related GHG emissions occur due to changes in trip generation,BAAQMD recommends a threshold of 1,100 metric tons per year COae(Bay Area Air Quality Management District 2011).This 1,100 metric ton threshold for land use projects is used in this analysis because it is more suitable and stringent than the 10,000 metric ton threshold for the stationary source projects. BAAQMD does not recommend a GHG emission threshold for construction activities. However,the BAAQMD recommends that GHG emissions from construction be quantified and disclosed using the most up to date calculation and analysis methods.The BAAQMD also recommended that lead agencies include a discussion of feasible construction mitigation necessary to reduce GHG emissions. Impact Discussion Would the project: a. Generategreenhousegas emissions, either directly or indirectly,that may have a significant impact on the environment? Construction Emissions Less than Significant New Impact. GHG emissions from the construction of the proposed modifications would primarily result from the use of diesel-powered construction equipment and heavy-duty haul trucks.Table 4.12-1 summarizes the construction-related GHG emissions from diesel-fueled equipment and vehicles as well as the gasoline-fueled employee vehicles.As shown in the table,the project would generate 24 metric tons of COae during the construction period.This is equivalent to adding five typical passenger vehicles to the road in a year(U.S.Environmental Protection Agency 2011). Because construction emissions would cease once construction is complete and the amount of GHG emissions generated by project construction are small,this new GHG impact would not be significant. g As noted above,although the 2010 BAAQMD guidelines are not formally adopted,due to a recent Alameda County Superior Court ruling,the City finds that the proposed significance threshold in the(now)draft guidelines are appropriate and technically justified to use in CEQA analysis by the evidence included in the guideline documents. Addendum No.2 to the Environmental Impact Report for 4 73 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12