RES 211231 Exhibit A - Laserfiche WebLink

Environmental Checklist and City of Pleasanton–10x Genomics Project Environmental Evaluation Initial Study/Mitigated Negative Declaration 42 FirstCarbon Solutions Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480024/ISMND/wp/21480024 10x Genomics Project Full Screencheck ISMND.docx feet of the project boundary. As shown in Table 5, Phase 1 grading activities and Phase 2 pavement removal activities would generate the greatest volume of exhaust emissions during project construction. These activities would occur across the entire project site. The Maximum Impacted Sensitive Receptor (MIR) during construction would be at the multi-family residences approximately 130 feet east of the project site across from Stoneridge Mall Road. Table 8 provides the estimated health and hazard impacts from construction emissions at the MIR for each sensitive receptor age group. The estimates shown in Table 10 include the application of BMPs recommended by the BAAQMD and required by MM AIR-1; however, it should be noted that implementation of MM AIR-1 would only reduce PM2.5 fugitive dust emissions and not PM2.5 exhaust. Table 8: Estimated Health Risks and Hazards—Unmitigated Construction Sensitive Receptor Age Group Cancer Risk (risk per million) Chronic Non- Cancer Hazard Index1 Annual PM2.5 Concentration (µg/m3) Infant 17.54 0.03 0.16 Child 3.37 0.03 0.16 Adult 0.52 0.03 0.16 Risks and Hazards 21.43 0.03 0.16 BAAQMD Thresholds of Significance 10 1 0.3 Exceeds Individual Source Threshold? Yes No No Notes: 1 Chronic non-cancer hazard index was estimated by dividing the annual DPM concentration (as PM2.5 exhaust) by the reference exposure level of 5 µg/m3. Source: Appendix A. As shown above in Table 8, the proposed project’s construction DPM emissions would exceed the BAAQMD’s cancer risk but would not exceed the BAAQMD’s chronic non-cancer hazard index or annual PM2.5 thresholds of significance at the maximum impacted receptor for any of the sensitive receptor age groups analyzed. Therefore, the proposed project would be required to implement MM AIR-2 to ensure that construction emissions would not result in significant health impacts to nearby sensitive receptors. MM AIR-2 would require the use of Tier 4 Final engines for select construction equipment, including excavators, sweepers and scrubbers, trenchers, graders, scrapers, aerial lifts, cement and mortar mixers, cranes, forklifts, welders, pavers, rollers, and off-highway trucks. Equipment tiers refer to a generation of emission standards established by the EPA and ARB that apply to diesel engines in off- road equipment. The “tier” of an engine depends on the model year and horsepower rating; generally, the newer a piece of equipment is, the higher the tier number it is likely to have. Excluding engines greater than 750 horsepower, Tier 1 engines were manufactured generally between 1996 and 2003. Tier 2 engines were manufactured between 2001 and 2007. Tier 3 engines were