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Engineering Division

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

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1.3.5 Alternatives Considered and Withdrawn - 25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]

 

 


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