Notice of Availability: Draft Supplemental Environmental Impact Report for Potential Project Modifications in the City of San Dimas

The Construction Authority is announcing the release of a Draft Supplemental Environmental Impact Report (SEIR) for proposed Project Modifications to the Glendora to Montclair Project in the City of San Dimas (see details below). The Draft SEIR 3 was released February 18, 2022, and is available for public review and comment through April 4, 2022.

How to Review the Draft SEIR:

The Draft SEIR 3 is available on the Construction Authority’s website ( Hard copies or CD versions of the document can be made available upon written request to the Construction Authority and mailed to recipients for the cost of printing and shipping. A hard copy of the document will also be available for public review at the Construction Authority’s office (address below) and can be accessed by requesting an appointment with Lisa Levy Buch at the address and e-mail below. In light of the COVID-19 pandemic, viewing of the document in person will only be available by pre-arranged appointment.

Proposed Project Modifications:

The Construction Authority is considering modifications to the Project to relocate the parking facility at the San Dimas Station from the previously approved location to a new location south of the project right-of-way between Monte Vista Avenue and San Dimas Avenue – the site is the current San Dimas Park and Ride Lot. The Project Modifications are proposed as a result of coordination conducted between the City of San Dimas and the Construction Authority. Approximately 289 parking spaces would be provided which is consistent with the number of parking spaces planned at the currently approved facility as part of SEIR 2. Relocation of the San Dimas parking facility would result in associated vehicle and pedestrian access changes in the vicinity of the San Dimas Station. All parking modifications would be designed and constructed in accordance with the Metro Rail Design Criteria. In response to these proposed changes, the Authority has prepared a SEIR (SEIR 3) to evaluate the potential for significant impacts that may result from the potential relocation of the San Dimas parking facility. No modifications are proposed for the parking facilities at the Glendora, La Verne, Pomona, Claremont, or Montclair Stations.

The proposed changes do not alter the scope of the Project as approved by the Construction Authority. The Draft SEIR 3 has concluded construction of the Project Modifications would not have new or more severe significant impacts or require new mitigation measures.

Graphic: Potential San Dimas Parking (Under Review; Not Approved)
(click to enlarge)


Providing Comments on the Draft SEIR 3:

The Draft SEIR 3 is being made available for public review for a 45-day comment period, commencing on Friday, February 18, 2022, and concluding on Monday, April 4, 2022. Public comments on the Draft SEIR 3 will be received during this period. Please submit comments on the Draft SEIR 3 in writing to the address or email address below by close of the comment period. All submitted comments concerning the Draft SEIR 3 must be received no later than 5:00 p.m., Monday, April 4, 2022.

Lisa Levy Buch
Chief Communications Officer
Metro Gold Line Foothill Extension Construction Authority
406 E. Huntington Drive, Suite 202
Monrovia, CA 91016-3633
Phone: (626) 305-7004

All comments received during the Draft SEIR 3 public review period will be compiled and responded to as part of the Final SEIR 3. If there are any questions regarding this notice, or how to review available documents, please contact Lisa Levy Buch at (626) 305-7004 or at

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