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Veterans Memorial Senior Center/YMCA Project 13 Addendum #2 City of Redwood City November 2025 Health Risk Effects The 2019 EIR determined that construction activities associated with the project could result in significant air quality impacts related to fugitive dust, construction equipment emissions, and vehicle exhaust. With the implementation of standard conditions of approval (including the BMPs described above) and mitigation measure MM AIR-3.1 from the 2019 EIR (excerpted below for reference), the 2019 EIR concluded that community health risk impacts – particularly those associated with increased cancer risk impacts – would be reduced to a less than significant level.7 The 2022 Addendum confirmed that the changes to the off-site traffic calming measures would not result in any new significant impacts or more significant impacts than disclosed in the 2019 EIR because the amount of construction equipment usage would decrease compared to the assumptions in the 2019 EIR.8 MM AIR-3.1 generally requires a 55 percent reduction in diesel exhaust emissions, as follows: 2019 EIR Mitigation Measure: 2019 EIR MM AIR-3.1: Prior to issuance of a grading permit, the project shall develop a plan demonstrating that the off-road equipment used on-site to construct the project would achieve a fleet-wide average 55-percent reduction in DPM exhaust emissions or greater. The plan shall be submitted and approved by the City Planning Division. The following are feasible methods: All diesel-powered off-road equipment, larger than 25 horsepower, operating on the site for more than two days continuously shall, at a minimum, meet EPA particulate matter emissions standards for Tier 3 engines with CARB-certified Level 3 Diesel Particulate Filters or equivalent. All diesel-powered off-road equipment, larger than 25 horsepower, operating on the site for more than two days continuously shall meet EPA Tier 4 standards for particulate matter. The use of equipment that includes electric or alternatively-fueled equipment (i.e., non-diesel) would meet the reduction requirement above. Like the original project, the modified project would implement the Air District’s standard BMPs and 2019 EIR MM AIR-3.1 to limit health risk impacts associated with construction on-site. The updated quantitative analysis prepared for the project (which is included in Appendix A) calculated the potential community health risks impacts associated with the modified project’s construction activities and concluded that although there would be a minor increase in emissions associated with the modified project (approximately five percent), the updated health risk impacts due to the modified project would not exceed the Air District’s significance thresholds with implementation of 7 Ibid. Pages 35 to 43. 8 City of Redwood City. Addendum to the Environmental Impact Report for the Veterans Memorial Senior Center/YMCA Project. September 2022. Page 7. ATTY/RESO.0111/CC RESO CONSIDERING AND APPROVING AN ADDENDUM TO THE FINAL EIR (YMCA PROJECT CEQA) - EXHIBIT A REV: 11-06-25 VR