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3. Environmental Checklist <br /> <br />San Leandro Treatment Wetland <br />IS/MND <br />3-35 February 2024 <br /> <br />3.9. Greenhouse Gas Emissions <br />ISSUES: GREENHOUSE GAS EMISSIONS <br />POTENTIALLY <br />SIGNIFICANT <br />IMPACT <br />LESS THAN <br />SIGNIFICANT <br />WITH <br />MITIGATION <br />INCORPORATED <br />LESS THAN <br />SIGNIFICANT <br />IMPACT <br />NO IMPACT <br />Would the Project: <br />a) Generate greenhouse gas emissions, either <br />directly or indirectly, that may have a significant <br />impact on the environment? <br />☐ ☐ ☒ ☐ <br />b) Conflict with an applicable plan, policy or <br />regulation adopted for the purpose of reducing the <br />emissions of greenhouse gases? <br />☐ ☐ ☒ ☐ <br /> Discussion <br />a) Generate significant GHG emissions: The Proposed Project's construction would involve using heavy <br />equipment, trucks, and employee vehicles to convert an existing wastewater storage basin into a <br />treatment wetland. BAAQMD has not established a quantitative significance threshold for evaluating <br />construction related emissions, but it does recommend quantifying and disclosing construction <br />generated GHG emissions.27 The emissions associated with construction activities were quantified <br />using the CalEEMod emissions model.28 Appendix A (Air Emissions Modeling Results) provides <br />detailed model input and output. <br />Table 3-6 summarizes estimated GHG emissions associated with construction and operation. As <br />indicated, the total construction-related GHG emissions would be approximately 253 metric tons (MT) <br />of carbon dioxide equivalents (CO2e) over the approximate one-year construction period. This value <br />represents the maximum absolute value rather than an amortized value over the anticipated life of the <br />Proposed Project. The short-term increase in GHG emissions would account for 0.04 percent of the <br />2017 City-wide GHG emissions budget, a de minimis temporary increase and less-than-significant <br />impact. <br />GHG emissions during the operations phase are expected to total 56.2 metric tons per year (MT/yr). <br />As such, the total GHG emissions during the first year would total 309.2 MT/yr in the first year and <br />56.2 MT/yr afterward. <br /> <br /> <br />27 Bay Area Air Quality Management District. 2022. California Environmental Quality Act Air Quality Guidelines. Available at <br />https://www.baaqmd.gov/plans-and-climate/california-environmental-quality-act-ceqa/updated-ceqa-guidelines <br />28 California Air Pollution Officers Association (CAPCOA) in collaboration with the California Air Districts. California Emissions Estimator <br />Model (CalEEMod) (Version 2022.1.1.21). Available at: https://www.aqmd.gov/caleemod/download-model