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Community Development


Initial Study with Mitigated Negative Declaration

This document contains a Mitigated Negative Declaration, which examines the environmental effects of a proposed project on the U.S. Highway 101/State Route 46 East Interchange in San Luis Obispo County.

The Initial Study and proposed Mitigated Negative Declaration were circulated to the public from August 11, 2009 to September 11, 2009. Comments received on the draft document and Caltrans’ responses to those comments are provided in the Comments and Responses section of this document (Appendix D), which has been added since the draft. Elsewhere throughout this document, a line in the margin indicates a change made since the draft document circulation.

What happens after this?

The proposed project has completed environmental compliance after the circulation of this document. When funding is approved, Caltrans can design and build all or part of the project.

Download Entire Document [pdf:13mb/226pp]

Download Section 1  
Cover, General Information  
Mitigated Negative Declaration iv
Summary vii
Table of Contents xi
List of Figures xiii
List of Tables xiv
List of Abbreviated Terms xv
List of Abbreviated Terms (continued) xvi
Chapter 1 Proposed Project [pdf:5.4mb/34pp] 17-50
1.1Introduction 17
1.1.1 Existing Facilities 17
1.2 Purpose and Need 18
1.2.1 Purpose 18
1.2.2 Need 19
1.3 Alternatives 28
1.3.1 Build Alternative 28
1.3.2 No-Build Alternative 45
1.3.3 Comparison of Alternatives 45
1.3.4 Identification of a Preferred Alternative 46
Alternatives Considered But Eliminated From Further Discussion  47
1.4 Permits and Approvals Needed 50
Chapter 2 Affected Environment, Environmental Consequences, and Avoidance, Minimization, and/or Mitigation Measures [pdf:5mb/96pp] 51-146
2.1 Human Environment 52
2.1.1 Land Use 52
2.1.2 Parks and Recreation 60
2.1.3 Utilities/Emergency Services 61
2.1.4 Traffic and Transportation/Pedestrian and Bicycle Facilities 63 2.1.5 Visual/Aesthetics 71
2.2 Physical Environment 84
2.2.1 Water Quality and Storm Water Runoff 84
2.2.2 Geology/Soils/Seismic/Topography 89
2.2.3 Hazardous Waste or Materials 93
2.2.4 Air Quality 97
2.2.5 Noise and Vibration 105
2.3 Biological Environment 122
2.3.1 Natural Communities122
2.3.2 Plant Species 134
Climate Change Under the California Environmental Quality Act 137
Chapter 3 Comments and Coordination 147
Chapter 4 List of Preparers 149
Chapter 5 References 153
Appendix A California Environmental Quality Act Checklist 155
Appendix B Title VI Policy Statement 167
Appendix C Avoidance, Minimization, and/or Mitigation Measures 169
Appendix D Comments and Responses 181
Appendix E Distribution List 223



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