Former Vallejo manufactured gas plant

PG&E is working with the City of Vallejo and private property owners to conduct an environmental investigation and cleanup of a former manufactured gas plant (MGP) site near Curtola Parkway and Sonoma Boulevard. All work is being conducted voluntarily under the oversight of the California Department of Toxic Substances Control (DTSC). This is an important first step in the future redevelopment of the property.

Former Vallejo manufactured gas plant in the 1920s

Site overview

An MGP operated at the site from the late 1800s to 1930. PG&E acquired the gas plant in 1905 and operated it until 1930, when it was put on standby status. The plant was largely dismantled by 1944. Gas-making operations took place on a piece of property south of Curtola Parkway that is now owned by the City. In addition, three gas holders were located to the north of Curtola Parkway on two smaller properties that are now privately-owned (see diagram).

Site overview about gas making operations

Project status

PG&E has made significant progress at the site. In 2015, DTSC approved the site investigation report, which defined the extent of impacts in soil, soil gas (air between soil particles) and groundwater. PG&E, with City concurrence, recently submitted a draft cleanup plan, also called a draft remedial action plan (RAP), to DTSC for review and approval.


The draft cleanup plan analyzed several different alternatives and settled on the one that will achieve the long-term cleanup goals of protecting human health and the environment while minimizing short-term impacts to the community. The selected alternative is explained in the draft RAP and combines excavation and off-haul with on-site treatment of contaminated soil. This approach minimizes truck traffic and the amount of material being placed in landfills, and aligns with the City's waterfront redevelopment plans.


After DTSC completes its review of the draft cleanup plan, the public will have 30 days to review the plan and provide comments. A public meeting will be held during the comment period at a location near the site to explain the proposed plan and accept public comments. DTSC will consider and respond to all comments prior to approval of the plan. PG&E anticipates site cleanup will begin in early 2019 and continue for roughly three years.


PG&E will continue to keep the community informed about this project through fact sheets, work notices and other outreach, as appropriate. More information is available by calling the PG&E toll-free community hotline at 1-866-247-0581.

Find more information at DTSC Resources & Contact Information.

Site-related documents can also be found at:
John F. Kennedy Library

505 Santa Clara Street

Vallejo, CA

1-866-572-7587, press 3 for reference desk

Contact information

Contact information

Environmental Remediation
Information and Response Line
By email:

Important health & safety information

Important health and safety information

There is no indication that PG&E's former MGP sites pose any health concerns to the public, based on our testing, experience, and extensive review of medical literature.