(I-5 to SR-55) Improvement Project

The Orange County Transporation Authority (OCTA), in cooperation with the California Department of Transportation (Caltrans) and the City of Irvine proposes to improve the mainline freeway and interchanges along Interstate 405 (I-405 or San Diego Freeway) in Orange Countuy. The proposed project alternatives would reduce congestion and improve operational efficiency on I-405 between I-5 and State Route 55 (SR-55) through the addition of general purpose(s) and auxiliary lanes. The approximately 8.5 mile long project corridor is located primarily in the City of Irvine.

An Inital Study/Environmental Assessment (IS/EA) - Mitigated Negative Declaration(MND)/Finding of No Significant Impact (FONSI) has been prepared for this project and provides responses to Draft IS/EA comments received during both public circulation periods. It compares the environmental impact evaluation and proposed avoidance, minimization and/or mitigation of potential impacts associated with all proposed Build Alternatives; and identifies the Preferred Alternative - Build Alternative 2.

The information in the Initial Study/Environmental Assessment (IS/EA) is intended to disclose potential environmental impacts and propose avoidance, minimzation, and/or mitigation to reduce impacts associated with all project alternatives.

Initial Study with Proposed Mitigated Negative Declaration/Environmental Assessment
Cover page/General Information/Title Page/Mitigated Negative Declaration/Finding of No Significant Impact
Table of Contents
Chapter 1 - PROPOSED PROJECT
Chapter 2 - AFFECTED ENVIRONMENT, ENVIRONMENTAL CONSEQUENCES, AND AVOIDANCE, MINIMIZATION, AND/OR MITIGATION MEASURES
Human Environment
2.1.1 Land use
2.1.2 Growth
2.1.3 Farmlands
2.1.4 Community Impacts
2.1.5 Utilities/Emergency Services
2.1.6 Traffic and Transportation/Pedestran and Bicycle Facilities
2.1.7 Visual/Aesthetics
2.1.8 Cultural Resources
Physical Environment
2.2.1 Hydrology and Floodplains
2.2.2 Water Quality and Stormwater Runoff
2.2.3 Geology/Soils/Seismic/Topography
2.2.4 Paleontology
2.2.5 Hazardous Waste/Materials
2.2.6 Air Quality
2.2.7 Noise and Vibration
Biological Environment
2.3.1 Natural Communities
2.3.2 Wetlands and Other Waters
2.3.3 Plant Species
2.3.4 Animal Species
2.3.5 Threatened and Endangered Species
2.3.6 Invasive Species
2.4 Cumulative Impacts
Chapter 3 - CALIFORNIA ENVIRONMENTAL QUALITY ACT
Chapter 4 - COMMENTS AND COORDINATION
Chapter 5 - LIST OF PREPARERS
Chapter 6 - DISTRIBUTION LIST

List of Appendices
Appendix A - Resources Evaluated Relative to Requirements of Section 4(f)
Appendix B - Title VI Policy Statement
Appendix C - List of Technical Studies
Appendix D - List of Acronyms and Abbreviations
Appendix E - FTIP Project Listing
Appendix F - Environmental Commitments Record
Appendix G - Project Plans
Appendix H - Response to Comments
Appendix I - FHWA Air Quality Conformity Determination

Technial Studies
Air Quality Study Report (April 2017)
Preliminary Geotechnical Report (December 2015)
Draft Relocation Impact Memorandum (March 2016)
Final Relocation Impact Memorandum (July 2018)
Energy Report (February 2017)
Location Hydraulic Study (December 2015)
Floodplain Evaluation Report (January 2016)
Historic Properties Survey Report (April 2016)
Initial Site Assessment (January 2016)
Jurisdictional Delineation (November 2012)
Natural Environment Study (June 2016) with Errata (June 2018)
Noise Study Report (November 2016)
Noise Abatement Decision Report (January 2017)
Paleontological Identification Report/Evaluation Report (November 2015)
Traffic Study Report (December 2016)
Visual Impact Assessment (April 2017)
Water Quality Assessment Report (February 2016)
Transportation Management Plan (February 2016)

If you have any questions about the project, please contact Carmen Lo, Associate Environmental Planner, California Department of Transportation, District 12, Division of Environmental Analysis, 1750 East 4th Street, Santa Ana, CA 92705.

Thank you for your visit! To learn more about other projects please visit our home page at http://www.dot.ca.gov/d12

A Look at District 12

Travel Conditions

 

Check Current Highway Conditions

 
You can also call 1-800-427-7623 for current highway conditions.

QuickMap is available in both Google Play and in the App Store. 

Google Play   Apple Store


Statewide Alerts and Other Information