Hunters Point Power Plant Closure and Cleanup

Remediation

PG&E’s remediation plan for the Hunters Point Site was approved by the Department of Toxic Substances Control (DTSC) on June 10, 2010. Following is an overview of the plan which focuses on three issues:

  • Soil impacted by the former plant operations
  • Groundwater impacted by plant operations, and
  • Naturally Occurring Asbestos (NOA) present in the fill material on which the site was built

More on closure and cleanup:

Site conditions (JPG, 40 KB)

Click on the photo to see a larger version.

Soil

Soil cleanup was substantially completed in 2012. Each completed area is deemed complete when confirmation soil sampling shows that the remedial action goals approved by DTSC have been met. Areas where soil cleanup is complete are covered with asphalt, clean soil or natural groundcover.

Groundwater

Groundwater in one portion of the site is impacted by petroleum. The cleanup plan for groundwater involves mixing or injecting a treatment agent RegenOx (PDF, 177 KB) into the groundwater zone to breakdown the petroleum over time. Groundwater is being monitored to ensure the plan is working. New ground monitoring wells have been installed in the treated areas and down gradient of these area. Groundwater at the Site is not used for drinking water.

In addition, two barrier walls are in place to safeguard against impacts to the Bay. PG&E installed a 200-foot long subsurface groundwater barrier in 2006 so that the area of impacted groundwater did not reach the bay, and this was successful in protecting the bay. The second wall was installed in 2012 in conjunction with the groundwater treatment to contain the groundwater treatment area while cleanup is in progress.

In addition, further studies are being conducted to finalize implementation details of an off-site groundwater treatment plan for 2013.

Naturally Occurring Asbestos (NOA)

The Hunters Point Site, like much of the Bayview Hunters Point neighborhood, is comprised of serpentine rock from the local hillsides. Serpentine rock contains NOA. As part of DTSC’s process, PG&E studied a range of options that would not only clean up effects of the former power plant but also safely address NOA.

Left undisturbed, NOA does not pose a hazard. After the impacts of the former power plant have been addressed, the plan calls for additional protective measures, including:

  1. Covering exposed areas with asphalt, clean soil, and vegetation to prevent exposure to NOA
  2. Recording a deed restriction requiring that protective measures be taken in connection with any redevelopment. For more information on how Naturally Occurring Asbestos will be managed during the cleanup, please see the Health and Safety page.

Shoreline

We will also be conducting investigations along the shoreline to determine whether additional measures are needed to protect the area, which lies outside the fence-line of the former power plant. If such measures are needed, a separate plan will be prepared. As part of DTSC’s public participation process, the community will have an opportunity to review the plan and provide public comment.

For a current project update, please see the most recent Community First newsletter or Community Notices located in the Archive page.

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