The Navy has developed the following list of relevant and timely topics about its cleanup program at the former Naval Station Treasure Island (NSTI). We hope that members of the community and media representatives will find this tool useful to better understand environmental cleanup efforts at NSTI.
Topics are in chronological order and introduced with a question, or a brief description of an issue which is followed by a statement from the Navy about NSTI.
Please make this page your first stop when looking for the most current content available about NSTI.
December 11, 2018 (FAQs Updated as of 5-11-21)
Frequently Asked Questions is safe to live on, work on and visit at NSTI.
September 17, 2019 (updated 10-4-19)
Facts About a Recently Excavated Low-level Radiological Material at Treasure Island
Because the Navy’s first priority in the cleanup at NSTI is public health and safety, the Navy has standard procedures in place to conduct radiological scans before, during, and after chemical cleanup work to determine whether any radiological materials are present during the soil excavation.
After removing the concrete, the Navy detected radiation above the background range in degraded material contained in the soil beneath the removed concrete. The Navy then excavated an area roughly 21 inches deep to ensure any contaminated material was safely removed.
Based on the results of the pre-excavation scan, which found no elevated radiation levels, and the scan results during the excavation work, Navy radiological health experts are confident there was no health risk to local residents or the public while the impacted material was in place or during its removal.
Supplemental information added October 4, 2019:
This means if a person was directly exposed to this unearthed degraded material for one hour per day for one year, the total accumulated dose over that year would be 4.7 millirem (mrem) which is about the average dose (4 mrem) a person receives from a cross-country flight from San Francisco to Washington, D.C.
March 26, 2019
Title: Work Performed by TETRA TECH EC on Treasure Island
Statement: The Navy understands the community concerns related to recent reporting about Tetra Tech EC work at Treasure Island. The Navy would like to reassure residents that there is no radiological health risk to those who live on, work on or visit Treasure Island.
- Buildings 343, 344 and 233
|For information about radiological work performed by Tetra Tech EC on Treasure Island Click here.|
February 2, 2019
The Environmental and Radiological Clean-up Program at NSTI
The Navy follows a deliberate, iterative and thorough regulatory clean-up process that is defined in the Comprehensive Environmental Response, Compensation, and Liability Act. This means that decisions are updated over time, as new data or information is collected. The process ensures regulatory vetting, stakeholder involvement and public awareness about the clean-up actions that are selected and implemented to protect the environment and community prior to any property parcels being transferred to the City of San Francisco for productive reuse.
Multiple regulatory agencies have concluded that even as clean-up requirements at NSTI evolved, there was no risk to human health and safety in residential areas. These findings were also confirmed with independent evaluations by the California Department of Public Health (CDPH). The state regulatory agencies, including the California Department of Toxic Substances Control (DTSC) and CDPH, review all work plans, scan results, site information and clean-up data and have not identified any unacceptable risk to those who live and work at NSTI. While there are certain areas of NSTI that are still undergoing investigation and cleanup, those areas have physical barriers in place to prevent public access.
December 19, 2018
Navy General Statement on Resident and Public Safety at NSTI
Multiple regulatory agencies have concluded that even as cleanup requirements at NSTI evolved, there was no risk to human health and safety in residential areas from subsurface objects discovered through the environmental cleanup program. These findings were also confirmed with independent evaluations by the California Department of Public Health (CDPH).
While there are certain areas of NSTI that are still undergoing investigation and cleanup, those areas have physical barriers in place to prevent public access. If radiological objects are discovered, they are removed and properly disposed.
The Navy’s protocols and the data are reviewed by state regulators, including the CDPH, State Water Board, and the California Department of Toxic Substances Control (DTSC). Their overarching role in monitoring the Navy’s work is to ensure the safety of human health and the restoration of the environment. The Navy values the health and safety of the community and will continue to transparently provide information on the remaining cleanup by sharing important updates through the Restoration Advisory Board (RAB), quarterly meetings, BRAC website, newsletters and public notices. READ MORE>