PA18-010 Underground Flow Equalization System (UFES)

PA18-010 - Site Plan

REVISED:  September 16, 2019

2495 Delaware Street
San Mateo Event Center
(Southeast corner, along
Saratoga Drive)

APN:  040-030-220

Clean Water Program
City of San Mateo
Public Works Department

Richard Patenaude
Contract Planner
(650) 522-7158 ext. 6


A Final Environmental Impact Report (Final EIR) has been prepared to specifically identify and analyze the anticipated environmental impacts of the Underground Flow Equalization System (UFES) project. The Final EIR includes responses to the comments received on the Draft EIR, as well as any amendments needed to the Draft EIR in response to comments.

The project will require a Special Use Permit for a public service use in the “A” Agricultural District and a Site Plan & Architectural Review (SPAR) for structures and walls over six feet in height.

The City of San Mateo Planning Commission will hold a public hearing to make a recommendation to the City Council regarding the Special Use Permit, Site Plan and Architectural Review and Final EIR. This will include a Resolution to Certify the Final Environmental Impact Report (FEIR), adopt the Mitigation Monitoring and Reporting Program; and adopt a Statement of Overriding Considerations regarding construction noise impacts.

The Planning Commission Public Hearing will be held on September 24, 2019 at 7 p.m. in the City Hall Council Chambers, 330 W. 20th Avenue, San Mateo CA 94403. Further information can be found here


     •    Project Plans: (Current) – September 16, 2019

Environmental Impact Report

     •    UFES FEIR, Final EIR Errata No. 1 and Mitigation Monitoring and Reporting Program (MMRP)

Draft Environmental Impact Report

     •    UFES DEIR – No Appendices
     •    Appendix A – Air Emissions Calculations
     •    Appendix B – Species Database Search Results & Potential to Occur
     •    Appendix C – Geologic Unit Descriptions
     •    Appendix D – Basin 2 & 3 Collection System Improvement UFES & Diversion Sewers Geotechnical Interpretive Report
     •    Appendix E – Phase I Environmental Site Assessment


Planning Commission - Public Hearing: 
Date:          September 24, 2019
Time:         7:00 p.m.
Location:  City of San Mateo, City Hall at Council Chambers
                   330 West 20th Avenue
                   San Mateo, CA 94403


•    Planning Commission (Study Session): Meeting Materials & Video – August 27, 2019
•    Planning Commission (Study Session): Meeting Materials – April 9, 2019
•    Planning Commission (Study Session): Meeting Video – April 9, 2019
•    Community Meeting: – May 21, 2019
(The Clean Water Program hosted a community meeting about the project and the Draft Environmental Impact Report with time for questions and answers. The meeting was held at the San Mateo County Event Center.) 


The City of San Mateo is implementing a series of capital projects, referred to collectively as the Clean Water Program (CWP), to replace aging wastewater infrastructure, build wet weather capacity, comply with regulatory requirements, and align with the City’s sustainability goals. In adopting the 2016 Final Program EIR for the CWP, the City Council selected the “In-System Storage Program” alternative. The Underground Flow Equalization System (UFES) project, consistent with the Council’s selected program alternative, will provide the wastewater system capacity to comply with regulations requiring prevention of sanitary system overflows.

This project consists of a concrete holding structure, pump station, diversion sewers and force main, and on odor control equipment room. These facilities would be located underground. Access hatches, an emergency backup generator, and an electrical building and vents for treated air would be located at ground level. The proposed project will provide for short-term storage of wastewater to prevent sanitary sewer overflows during wet weather. On July 17, 2017, the City Council selected the San Mateo County Event Center parking lot as the preferred location for the project.

For more information on the City's Clean Water Program, please visit that website at: