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ANALYSIS AND IMPACT DISCUSSION Construction - Period Greenhouse Gas Emissions Significance Criteria: BAAQMD does not have an adopted threshold of significance for construction- related GHG emissions. A comparison to the previously approved project was used for this analysis. Temporary construction- related exhaust would be an additional source of GHG emissions that could contribute to significant impacts on the environment. Sources of construction - related GHGs only include exhaust from on -site construction equipment and trucks and worker vehicles coming to and leaving the site. The proposed Retail and Office Project would disturb the same acreage and require construction of less building square footage than the approved Office Only Project. This would result in the similar or lessened GHG emissions. Therefore, changing the project from office to retail would result in no impact related to construction- period GHG emissions. However, BAAQMD now encourages implementation of best management practices to reduce GHG emissions during construction, as applicable. Best management practices may include, but are not limited to: • using alternative fueled (e.g., biodiesel, electric) construction vehicles /equipment of at least 15 percent of the fleet, • using local building materials of at least 10 percent, and • recycling or reusing at least 50 percent of construction waste or demolition materials. If implemented by the project, the above measures would further reduce construction- period GHG emissions. Operational Period Greenhouse Gas Emissions Significance Criteria: The Project would have a significant environmental impact if it would exceed BAAQMD's GHG emissions threshold of GHG emissions of more than 1,100 metric tons per year of CO2e or 4.6 metric tons CO2e per service population per year. BAAQMD has determined that GHG emissions and global climate change represent cumulative impacts. No single project could generate enough GHG emissions to noticeably change the global average temperature. The combination of GHG emissions from past, present, and future projects contribute substantially to the phenomenon of global climate change and its associated environmental impacts. In developing thresholds of significance for GHG emissions, BAAQMD considered the emission levels for which a project's individual emissions would be cumulatively considerable. If a project exceeds the identified significance thresholds, its emissions would be GHG EMISSIONS ANALYSIS FOR THE PLEASANTON GATEWAY PROJECT PAGE 5 OF 9