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IMPACTS AND MITIGATION MEASURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5 Impact Assessment Methods and Key Assumptions . . . . . . . . . . . . . . . . . . . . . 8-5 Criteria for Determining the Significance of Impacts . . . . . . . . . . . . . . . . . . . . 8-8 2015 PROPOSED PROJECT WITH PHASE 1 OR PHASE 2 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8 Impact AQ-1: Temporary Emissions of ROG and NO, Resulting from Construction Activities . . . . . . . . . . . . . . . . . . . . . 8-8 Impact AQ-2: Temporary Emissions of PMIO from Construction Activities . 8-9 2015 PROPOSED PROJECT WITH PHASE 1 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10 Impact AQ-3: Exceedance of Carbon Monoxide Standards Under 2015 Project(Phase 1 Interchange) Conditions . . . . . . . . . . . . . . . . . . . . . . 8-10 Impact AQ-4: Increased Ozone Precursor and PM 10 Emissions Under 2015 Project (Phase 1 Interchange) Conditions . . . . . . . . . . . . . . . . . . 8-11 2015 PROPOSED PROJECT WITH PHASE 2 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12 i Impact AQ-5: Exceedance of Carbon Monoxide Standards Under N 2015 Project (Phase 2 Interchange) Conditions . . . . . . . . . . . . . . . . . . 842 Impact AQ-6: Increased Ozone Precursor and PM 10 Emissions Under 2015 Project (Phase 2 Interchange) Conditions . . . . . . . . . . . . . . . . . . 8-12 Consistency with General Plan and Other Planning Policies . . . . . . . . . . . . . 8-13 Impact AQ-7: Inconsistency with General Plan Policies . . . . . . . . . . . . . . . . 8-13 1 Chapter 9. Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 Regulatory Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 Environmental Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2 IMPACTS AND MITIGATION MEASURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3 Impact Assessment Methods and Key Assumptions . . . . . . 9-3 [ Criteria for Determining the Significance of Impacts . . . . . . . . . . . . . . . . . . . . 9-4 2015 PROPOSED PROJECT WITH PHASE 1 OR PHASE 2 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 - Impact N-1: Exposure of Noise-Sensitive Uses to Noise From Construction Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5 Impact N-2: Exposure of Noise-Sensitive Land Uses to Increased Aircraft Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6 2015 PROPOSED PROJECT WITH PHASE 1 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6 Impact N-3: Exposure of Noise-Sensitive Land Uses to Increased Surface Traffic Noise Under 2015 Proposed Project(Phase 1 Interchange) Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7 2015 PROPOSED PROJECT WITH PHASE 2 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7 Impact N-4: Exposure of Noise-Sensitive Land Uses to Increased Surface Traffic Noise Under 2015 Proposed Project (Phase 2 Interchange) Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7 iv