(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.

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

Public Notice

Initial Study with Proposed Mitigated Negative Declaration/Environmental Assessment
Cover page/General Information/Title Page/Proposed Mitigated Negative Declaration
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

Technial Studies
Air Quality Study Report (April 2017)
Preliminary Geotechnical Report (December 2015)
Draft Relocation Impact Memorandum (March 2016)
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)
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)

Please submit your comments in writing no later than 5 pm, December 15, 2017 to Scott Shelley, Associate Environmental Planner, California Department of Transportation, District 12, Division of Environmental Analysis, 1750 East 4th Street, Santa Ana, CA 92705 or via e-mail to:

D12.405-South-Improvement-Project@dot.ca.gov

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

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Contact Information

General Information:

Phone: (657) 328-6000
Fax: (657) 328-6511

Physical Address:

California Department of Transportation
District 12
1750 East 4th Street, Suite 100
Santa Ana CA 92705

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