U.S. HIGHWAY 101/STATE ROUTE 46 WEST
INTERCHANGE
MODIFICATION PROJECT
District 05-SLO-101, PM 53.8/54.5
District 05-SLO-46, PM
R21.5/R22.0
EA 05-451300
SCH # 2008051102
Initial Study with Mitigated Negative Declaration/Environmental Assessment with Finding of No Significant Impact
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 About This Document
Table of Contents
Finding of No Significant Impact - iii
Mitigated Negative
Declaration - v
Summary - vii
Table of
Contents - xiii
List of Figures - xv
List of Tables - xv
Chapter 1 - Proposed Project
[pdf:2.2mb/28pp]
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1.3.5 Alternatives Considered and Withdrawn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
Chapter 2 - Affected Environment, Environmental Consequences, and Avoidance, Minimization, and/or Mitigation Measures
[pdf:3.4mb/144pp]
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
Chapter 3 - Comments and Coordination - 173
Chapter 4 - List of Preparers - 177
Chapter 5 - Distribution List - 181
Appendix A - California Environmental Quality Act Checklist
Appendix B - Title VI Policy Statement
Appendix C - Summary of Relocation Benefits
[pdf:2.3mb/20pp]
Appendix D - Minimization and Mitigation Measures Summary
Appendix E - Natural Resources Conservation Service Impact Rating Form
Appendix F - References
Appendix G - Response to Comments (1-21)
Comments/Responses:
- 1-13 [pdf:2.5mb/49pp]
- 14 [pdf:2.7mb/40pp]
- 15-19 [pdf:2.6mb/49pp]
- 20 [pdf:1.4mb/13pp]
- 21 [pdf:2.4mb/21pp]
Appendix H - List of Technical Studies Bound Separately
Appendix I - Memorandum of Understanding and Funding Commitment Correspondence
[pdf:2.5mb/11pp]
