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C Criteria for Determining the Significance of Impacts . . . . . . . . . . . . . . . . . . . 6-13 VEGETATION IMPACT ASSESSMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14 Impact VW-1: Loss of 2.65 Acres of Freshwater Marsh . . . . . . . . . . . . . . . . 6-14 Impact VW-2: Loss of 0.6 Acre of Drainage Ditch . . . . . . . . . . . . . . . . . . . . 6-15 Impact VW-3: Loss of 1.2 Acres of Seasonal Pool Habitat . . . . . . . . . . . . . . 6-15 Impact VW-4: Conversion of Approximately 591 Acres of Agricultural Fields and Potential Habitat for Special-Status Plant Species to Developed Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16 Impact VW-5: Potential Loss of Oak Trees . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16 WILDLIFE IMPACT ASSESSMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17 Impact VW-6: Loss of Habitat for Common Wildlife Species . . . . . . . . . . . . 6-17 Impact VW-7: Direct Mortality and Loss of Habitat for Vernal Pool Fairy Shrimp and Vernal Pool Tadpole Shrimp . . . . . . . . . . . . . . . . . 6-17 Impact VW-8: Potential Loss of Giant Garter Snake Habitat . . . . . . . . . . . . . 6-18 ` Impact VW-9: Potential Loss of Swainson's Hawk Foraging Habitat . . . . . . 6-18 # Impact VW-10: .Potential Disturbance of Nesting Swainson's Hawks . . . . . . 6-19 Impact VW-11: Potential Loss of Burrowing Owl Nesting and Foraging Habitat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20 Impact VW-12: Loss of or Disturbance to an Active Raptor Nest . . . . . . . . . 6-21 Impact VW-13: Loss of Suitable Foraging Habitat for Other Special-Status Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21 Consistency with General Plan and Other Planning Policies . . . . . . . . . . . . . 6-22 Chapter 7. Transportation and Circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Regulatory Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Environmental Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 IMPACTS AND MITIGATION MEASURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 Approach and Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 Criteria for Determining Significance of Environmental Impacts . . . . . . . . . . . 7-6 2015 PROPOSED PROJECT WITH PHASE 1 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 Impact T-1: Increased Traffic at Roadways, Freeway Ramps, and Intersections Resulting from Project (Phase 1 Interchange) Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 2015 PROPOSED PROJECT WITH PHASE 2 INTERCHANGE IMPROVEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 Impact T-2: Increased Traffic at Roadways, Freeway Ramps, and Intersections Resulting from Project(Phase 2 Interchange) Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 Consistency with General Plan and Other Planning Policies . . . . . . . . . . . . . . 7-9 Chapter 8. Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . . . . . . . . . 1 . 8-1 SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 Regulatory Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 Environmental Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4 iii