Environmental Impact/Permitting

The Clean Water Program will have a positive impact on our environment by preventing raw sewage from overflowing into San Francisco Bay. As with most infrastructure improvements, there are some temporary nuisance impacts during construction and changes associated with building new facilities. The City conducted an environmental review of the Clean Water Program that addressed potential impacts under the California Environmental Quality act (CEQA) via a Programmatic Environmental Impact Report, that was approved by City Council in June 2016.

As design has progressed, the City continues to review project elements to ensure compliance with CEQA. As part of this review, the City prepared an Environmental Impact Report for the Underground Flow Equalization System Project (formerly called the In-System Storage Facility). Below is information pertaining to the CEQA documentation the City has prepared on behalf of the Program.


Underground Flow Equalization System Project Final Environmental Impact Report

The City prepared the Final Environmental Impact Report (Final EIR) to review the potential environmental impacts associated with the Underground Flow Equalization System Project (UFES Project). Comments received during the public review and comment period of the Draft EIR were considered in the preparation of the Final EIR, and written responses to comments are included in the document. The Notice of Availability of the Draft EIR was issued on March 6, 2019, and the public review and comment period ran from March 6, 2019 through May 31, 2019. Prior to preparing the Draft EIR, the City conducted a 40-day public scoping effort to solicit comments on the scope of the EIR. The Notice of Preparation was issued on September 7, 2018, and the scoping period ran from September 10, 2018 through October 22, 2018.  A copy of the notice can be downloaded here. More information about the UFES Project can be found here.

The Final EIR is now available for public review and comment. A Notice of Availability was issued on September 6 and can be downloaded here.

A digital copy of the Final EIR is available for download at the links provided below. Hard copies are available for viewing at the following locations:

City Hall, 330 West 20th Avenue
San Mateo Main Library, 55 West 3rd Avenue
Download the entire Final EIR, just the main text, or just the technical appendices at the links provided below:

Final EIR Full Document (47MB pdf file, reduced resolution)
Final EIR Main Text (38MB pdf file, full resolution)
Technical Appendices (80MB pdf file, full resolution)
Final EIR Errata No. 1 (13MB pdf file)
Mitigation Monitoring and Reporting Program (1MB pdf file)


Clean Water Program Final Programmatic Environmental Impact Report

The City conducted a full review of the Clean Water Program through a Programmatic Environmental Impact Report (PEIR) in 2015/2016.

The Public Works Commission received public comments on the Final PEIR and made a recommendation to the San Mateo City Council regarding certification and adoption of the Final PEIR at the May 11, 2016 Public Works Commission Meeting. A summary of the comments received with responses is available here.

The San Mateo City Council certified and adopted the Final PEIR; approved the Underground Flow Equalization System Alternative (formerly called the In-System Storage Alternative) for the Clean Water Program; and adopted required findings, a statement of overriding considerations, and the mitigation monitoring or reporting program at the June 6, 2016 City Council meeting.

Download the entire Final Programmatic Environmental Impact Report, or just the individual section you are interested in below:

Notice of Availability Final PEIR
Full Final PEIR, released April 2016
Cover, ToC, Acronyms
Executive Summary
Chapter 1 Introduction
Chapter 2 Program Description
Chapter 3 Aesthetics
Chapter 4 Air Quality
Chapter 5 Biological Resources
Chapter 6 Cultural Resources
Chapter 7 Geology and Soils
Chapter 8 Greenhouse Gases
Chapter 9 Hazards and Hazardous Materials
Chapter 10 Hydrology and Water Quality
Chapter 11 Land Use
Chapter 12 Noise
Chapter 13 Population and Housing
Chapter 14 Public Services
Chapter 15 Recreation
Chapter 16 Transportation Traffic
Chapter 17 Utilities
Chapter 18 Other Required California Environmental Quality Act
Chapter 19 Alternatives
Chapter 20 Report Preparation
Appendix A Evaluation of In-System Storage Location Alternatives for the San Mateo Clean Water Program
Appendix B Air Emissions Calculations
Appendix C Special-status Species Tables
Appendix D Wetlands Delineation Report
Appendix E Geologic Units
Appendix F Master Responses, Responses Public Letters, and Public Hearings
Appendix G Changes to Draft Programmatic Environmental Impact Report

Notice of Availability Draft PEIR
Full Draft PEIR, released October 2015


Addenda to the CWP Final PEIR – Wastewater Treatment Plant Project Evaluation

Since the certification of the Final PEIR, the detailed design of the wastewater treatment plant (WWTP) has progressed.

To evaluate whether the changes to the WWTP (since the certification of the Final PEIR) could require the preparation of a subsequent or supplemental environmental impact report, the more detailed project was compared to the original project evaluated in the Final PEIR. The key changes to the project consist of slightly different locations for the various project components.

Under CEQA, if the criteria requiring the preparation of subsequent or supplemental environmental impact report are not met, then an addendum is considered to be the appropriate document. The purpose of an addendum is to update the analysis in the original EIR when there are minor project changes (in this case, the specific locations of the project components on the site).

Download the Addenda to the Final PEIR below:

Addendum 1 to the San Mateo CWP Final Programmatic Environmental Impact Report
Addendum 2 to the San Mateo CWP Final Programmatic Environmental Impact Report