Cleanup areas and recent activities

Former Potrero Power Plant | Site Overview | Cleanup Areas & Recent Activities | FAQArchive


Potrero Site Map


We have made significant progress on the environmental investigation and remediation of the site. We finished work in two of the seven project areas: the PG&E owned Hoe Down Yard, and the Switchyard and Construction Yard Area. In addition, we are in the process of securing regulatory closure of the Station A area owned by Associate Capital. With the Station A Area complete, about two-thirds of the upland project site has been successfully remediated.

Work is progressing in four remaining areas: the Northeast Area (which includes the southeast portion of the adjacent Pier 70 owned by the Port of San Francisco), the Offshore Sediment Area, the Tank Farm Area and the Power Generation Facility Area.

See our area-by-area updates below:


Northeast Area (Associate Capital and Port of San Francisco owned)

This area includes the northeastern corner of the Potrero power plant property owned by Associate Capital and a portion of Pier 70 (as illustrated above), which is owned by the Port of San Francisco.

The cleanup plan (also known as a Remedial Action Plan) approved by the Water Board (Solidification with Limited Excavation) is a well-accepted remediation approach, wherein a portion of MGP residues at the Power Plant property will be solidified in place using a cement mix. This method will address MGP residues in the areas that extend deep below the ground surface and are difficult to excavate. MGP residues at a shallower depth on the Pier 70 Port property will be excavated.

The cleanup also includes installing a durable cover. The cover will go over areas where solidified soil is present or MGP residues are present in smaller quantities. The durable cover (which may consist of paving, buildings or clean soil with vegetation) will prevent exposure to the remaining residues. It will also protect human health and future exposure to materials below the ground surface. In addition, a land use covenant (LUC) and a risk management plan (RMP) will provide safety guidelines for future construction and maintenance activities.

After the cleanup, groundwater will be monitored to confirm it is being protected.


Active cleanup will begin in 2017. Before work starts, PG&E will host a community meeting to address questions and share details about the cleanup effort.


Offshore Sediment Area

PG&E is in the process of developing a cleanup plan for the Offshore Sediment Area. This area includes sediments in the San Francisco Bay near the former power plant property and the Port of San Francisco's Pier 70 property.

PG&E conducted a thorough investigation of the Offshore Sediment Area. The results, approved by the Water Board, indicate the presence of impacts that were likely the result of PG&E's historical operations.

A cleanup method for the area was approved by the Water Board last year. The cleanup focuses on two sections within the Offshore Area: the Nearshore Area (about 50-75 feet from the shoreline) and the area called the Transition Area (about 100 to 150 feet into the Bay).

Impacted sediment in the Nearshore area will be dredged and removed and are will be capped, some sediments will be treated in place using activated carbon, and ongoing natural recovery processes will reduce the level of impacts in other areas.

Within parts of the Northern Transition Area, impacted sediments will be treated in-place with activated carbon and then monitored. The Southern Transition Area will be monitored as well, but does not require treatment.

PG&E is now working with the Water Board on the Cleanup Plan, also known as a Remedial Action Plan (RAP). The RAP provides the details of how we will implement the approved approach described above. The RAP will also include details about disposal of dredged materials, our planned trucking route through the neighborhood, and important worker and community safety plans.

The RAP will be available for public review and comment in 2017.

Switchyard and General Construction Yard Areas (PG&E owned)

The Switchyard and General Construction Yard remain an integral part of San Francisco's electrical infrastructure. Environmental remediation work in this area has been completed and approved by the Water Board. In 2012, the Water Board issued a completion (i.e., no further action) letter that states no further remediation work is needed in this area.




Hoe Down Yard (PG&E owned)

Environmental remediation work for the Hoe Down yard (a PG&E construction and equipment storage area) has been completed and approved by the Water Board. In 2012, the Water Board issued a completion (i.e., no further action) letter for environmental work in this area.


Hoe down yard


Station A Area (Associate Capital/PG&E owned)

PG&E is nearing a major milestone as we finalize completion of the Station A closure, one of the largest areas of the Site.


In 2016, the Water Board approved a Risk Management Plan (RMP)/Final Remedy for the Station A Area. In 2017, PG&E purchased an acre of Station A for construction of a Gas Insulated Substation. In response, a revised Final Remedy was prepared and approved by the Water Board.


The Final Remedy outlines the steps that will be taken to maintain safe conditions during future construction. PG&E have finalized the terms of land use covenants (LUCs) for their respective portions of Station A, which detail how the areas will remain protective of human health and the environment into the future. Now that the Final Remedy addendum, RMP, and LUCs are in-place, the Water Board is expected to issue a formal complete (no further action) letter.


View of buildings in station A area


Power Block Unit 3 (Owned by Associate Capital)

This area includes the unit 3 power plant (which was shut down in 2011) and immediate surroundings.

We recently completed soil and groundwater investigations in the area and are now working with the Water Board to analyze the results of the investigations. We anticipate a closure plan will be available for public review and comment this year, with formal closure anticipated in 2018.


Image shows power plant


Tank Farm Area (Owned by Associate Capital)

This area includes three large above-ground fuel tanks formerly used to house fuel oil and diesel fuel. Limited soil and groundwater investigations have been conducted in this area.


View of 3 large above-ground fuel tanks


Safety and reliability projects

In addition to remediation efforts, PG&E is conducting work at the site as part of its commitment to improve the safety and reliability of service in San Francisco. Learn about a new 230kV power transmission line that will be installed between the Embarcadero and Potrero substations.

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.