UCSF toxicologist Tamer Durani urges action on PCE contamination in Sunset Neighborhood

The San Francisco City Council meeting on July 4, 2025, focused on significant health concerns related to tetrachloroethylene (PCE) contamination in the Mid Sunset neighborhood. Dr. Tamer Durani, a toxicologist from UCSF, presented findings indicating that PCE levels in the soil and homes exceed safety thresholds, posing serious health risks, particularly to children and pregnant individuals. He emphasized the need for immediate remediation to prevent further exposure, advocating for soil vapor extraction as the preferred method.

Dr. Durani highlighted that long-term exposure to PCE is linked to cancer and cognitive impairments. He argued that the opportunity to prevent additional exposure should not be overlooked, as it is more beneficial than addressing health issues after they arise. Following Dr. Durani, Dan Grasmick from Apex Companies discussed the technical aspects of implementing an active soil vapor extraction system, asserting that it would effectively reduce PCE concentrations in the area.

Grasmick countered claims from project developers that no primary source of contamination exists on-site, stating that secondary sources of PCE continue to affect the neighborhood. He noted that the soil's composition makes it suitable for vapor extraction, which could significantly lower contamination levels within months.

The meeting also addressed concerns about the adequacy of previous investigations into the contamination, with some commissioners questioning the thoroughness of the testing conducted during the demolition of the site. They expressed the need for clarity on whether new data emerged from the demolition process that could impact remediation efforts.

In conclusion, the council's discussions underscored the urgency of addressing PCE contamination in the Mid Sunset neighborhood, with experts advocating for immediate action to safeguard public health. The board has the authority to condition project approvals on the implementation of remediation measures before construction begins, highlighting the critical intersection of environmental health and urban development in San Francisco.