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risk threshold of 10 in a million. The maximum potential chronic health index associated with the Project is 0.37 (occurs at an existing on-site worker receptor location), which would not exceed the BAAQMD's chronic hazard index threshold of 1. The maximum potential annual average PM2.5 concentration associated with the Project is 0.28 micrograms per cubic meter(µg/m3) (occurs at an existing on-site worker receptor location), which would not exceed the BAAQMD's threshold of 0.3 1.1g/m3. Therefore, Project-level impacts due to exposure of sensitive receptors to toxic air contaminants (TACs) would be less than significant. (See Revised HRA Tables 6, 7, 8 in RTC Appendix B; Tables 3- 7, 3-8, 3-9 of HRA; Response to Comments 2-2.) • Cumulative air quality impacts due to exposure of sensitive receptors to toxic air contaminants are less than significant. The maximum potential cumulative lifetime excess cancer risk associated with the Project and all background TAC sources within 1,000 feet of the Project is 86.7 in a million(occurs at an off-site worker receptor location),which would not exceed the BAAQMD cumulative cancer risk threshold of 100 in a million. The maximum potential cumulative chronic health index associated with the Project is 0.40 (occurs at an existing on- site worker receptor location), which would not exceed the BAAQMD's chronic hazard index threshold of 10. The maximum potential cumulative annual average PM2.5 concentration associated with the Project is 0.49 µg/m3 (occurs at an existing off-site residential receptor location), which would not exceed the BAAQMD's threshold of 0.8 µg/m3. Therefore, cumulative impacts due to exposure of sensitive receptors to TACs would be less than significant. (See Revised HRA Tables 10 and 11 in Response to Comments Appendix B.) • All three air quality impacts identified in the Draft SEIR as significant and unavoidable due to Project operations—operational emissions of criteria air pollutants (Impact 4.B-2), conflict with the applicable air quality plan (Impact 4.B-3), and cumulative emissions of criteria air pollutants (Impact 4.B-6)–have now been found to be less than significant. First, average daily full-buildout operational emissions of ROG,NOX, PM10, and PM2.5 would be 47.48, 34.16, 75.70, and 20.68 pounds per day, respectively. In addition, Phase 1 operational emissions plus Phase 2 construction emissions of ROG,NOX, PM10, and PM2.5 would be 49.95, 22.55, 35.91, and 10.07 pounds per day, respectively. These emissions do not exceed BAAQMD's threshold for ROG,NOX, and PM2.5 of 54 pounds per day and for PM10 of 82 pounds per day. Therefore, mitigation is not required and the impact would be less than significant. Second, operation of the project would not conflict with or obstruct implementation of the applicable air quality plan(the BAAQMD 2017 Clean Air Plan)because operational emissions of all criteria pollutants are below the project-level thresholds and the project would be consistent with the applicable air quality control measures contained in the 2017 Clean Air Plan. Therefore, mitigation is not required and the impact would be less than significant. Third,the cumulative air quality impact from operations of the project would not be cumulatively