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City of San Leandro 14143-14273 Washington Avenue Warehouse Project 38 Table 10 Estimated Cancer Risks and Chronic Non-Cancer Hazards Cancer Risk (risk per million) Chronic Non-Cancer Hazard Index1 TAC Concentration (micrograms per cubic meter) Residential MIR 7.29 <0.01 0.02 Significance Threshold 10 1 0.3 Threshold Exceeded? No No No MIR = Maximally Impacted Receptor TAC = toxic air contaminants 1 Chronic non-cancer hazard index was estimated by dividing the annual DPM concentration (as PM2.5 exhaust) by the DPM reference exposure level of 5 micrograms per cubic meter Threshold source: BAAQMD 2022. See Appendix B for the cancer health risk model output results. This assessment uses outputs from the CalEEMod modeling conducted using a previous model version, which estimated greater construction emissions than the updated CalEEMod outputs attached to the end of Appendix B. Therefore, this cancer risk assessment is more conservative in that is utilizes greater estimated emissions. As shown above, the proposed project’s construction emissions would not exceed applicable BAAQMD significance thresholds. Project construction would not result in significant health impacts to nearby sensitive receptors. Cumulative Health Risk Assessment FirstCarbon Solutions conducted a health risk assessment for potential cumulative impacts from TAC sources within 1,000 feet of a project, which was peer-reviewed by Rincon Consultants. The health risk assessment incorporated BAAQMD pre-calculated air pollutant concentrations and associated traffic volumes for analyzing health risks associated with local roadways; BAAQMD pre-estimated cancer risks and PM2.5 concentration increases associated with nearby highways (I-880 and SR 185); emissions from permitted stationary sources; and PM2.5 concentrations associated with railroad operations at the western boundary of the project. The results of the construction cumulative health risk assessments are shown in Table 11.