- Home
- Government
- Departments
- Public Works
- City Projects
- In Progress
- U.S. Highway 101 / State Route 46 West Interchange
U.S. Highway 101 / State Route 46 West Interchange
District 05-SLO-101, PM 53 8, 1954.5
District 05-SLO-46, PM R21.5/R22.0
EA 05-451300
SCH Number 2008051102
Initial Study with Mitigated Negative Declaration / Environmental Assessment
Prepared by:
The State of California Department of Transportation
The environmental review, consultation, and any other action required in accordance with applicable federal laws for this project is being, or has been, carried out by the California Department of Transportation under its assumption of responsibility pursuant to 23 U.S. Code 327.
December 2009
General information (PDF) about this document.
Table of Contents
- Finding of No Significant Impact (PDF) - iii
- Mitigated Negative Declaration (PDF) - v
- Summary (PDF) - vii
- Table of Contents (PDF) - xiii
- List of Figures (PDF) - xv
- List of Tables (PDF) - xv
Proposed Project
- 1.1 Introduction - 1
- 1.2 Purpose and Need -7
- 1.2.1 Purpose - 7
- 1.2.2 Need - 9
- 1.3 Alternatives - 11
- 1.3.1 Build Alternatives - 11
- 1.3.2 No-Build (No-Action) Alternative - 14
- 1.3.3 Comparison of Alternatives - 14
- 1.3.4 Identification of a Preferred Alternative - 23
- 1.3.5 Alternatives Considered and Withdrawn - 25
- 1.4 Permits and Approvals Needed - 27
Affected Environment, Environmental Consequences & Avoidance, Minimization & / or Mitigation Measures
- 2.1 Human Environment - 30
- 2.1.1 Land Use - 30
- 2.1.2 Growth - 40
- 2.1.3 Farmlands - 42
- 2.1.4 Community Impacts - 45
- 2.1.5 Utilities/Emergency Services - 59
- 2.1.6 Traffic and Transportation/Pedestrian and Bicycle Facilities - 61
- 2.1.7 Visual/Aesthetics - 69
- 2.2 Physical Environment - 81
- 2.2.1 Hydrology and Floodplains - 81
- 2.2.2 Water Quality and Storm Water Runoff - 85
- 2.2.3 Geology/Soils/Seismic/Topography - 90
- 2.2.4 Paleontology - 93
- 2.2.5 Hazardous Waste Materials - 95
- 2.2.6 Air Quality - 102
- 2.2.7 Noise - 116
- 2.3 Biological Environment - 129
- 2.3.1 Natural Communities - 129
- 2.3.2 Wetlands and Other Waters - 143
- 2.3.3 Animal Species - 147
- 2.3.4 Invasive Species - 151
- 2.4 Cumulative Impacts - 153
- 2.5 Climate Change under the California Environmental Quality Act - 156
Comments & Coordination
Chapter 3 (PDF) - 173
List of Preparers
Chapter 4 (PDF) - 177
Distribution List
Chapter 5 (PDF) - 181
- Appendix A (PDF) - California Environmental Quality Act Checklist
- Appendix B (PDF) - Title VI Policy Statement
- Appendix C (PDF) - Summary of Relocation Benefits
- Appendix D (PDF) - Minimization and Mitigation Measures Summary
- Appendix E (PDF) - Natural Resources Conservation Service Impact Rating Form
- Appendix F (PDF) - References
- Appendix G - Response to Comments (1-21)
- Comments/Responses:
- Appendix H (PDF) - List of Technical Studies Bound Separately
- Appendix I (PDF) - Memorandum of Understanding and Funding Commitment Correspondence