Phillips 66 San Francisco Refinery (formerly Unocal) – Post Closure Permit Renewal, Primary Basin

Phillips 66 San Francisco Refinery (formerly Unocal) – Post Closure Permit Renewal, Primary Basin

The California Department of Toxic Substances Control (DTSC) approves the Hazardous Waste Facility Post-Closure Permit Renewal (Permit) for the Primary Basin at the Phillips 66 Company – San Francisco Refinery (SFR) for ten additional years. DTSC prepared an addendum to a previously adopted Initial Study/Negative Declaration due to updates to the CEQA Guidelines and not as a result of project changes as the Permit Renewal will continue the monitoring and inspection programs of the Primary Basin, as approved in the previous Post-Closure Permit. The Primary Basin will no longer be used for storage of wastewater or stormwater and no ground disturbing activities are proposed by SFR. The SFR is located at 1390 San Pablo Avenue in Rodeo, California. The Primary Basin located at the Unit 100 Wastewater Treatment Plant (WWTP), is a below-grade, open-air, surface impoundment with a concrete bottom and gunite sides. It was previously permitted to temporarily store up to 2.3 million gallons of hazardous process wastewater and/or stormwater during emergencies and high intensity rainfall events. An outflow weir limited the total storage capacity of the Primary Basin to 2.3 million gallons with 2.5 feet of freeboard. The Primary Basin was used for temporary storage of a combination of process wastewater and stormwater during operating emergencies at the SFR, such as at times of peak flow and/or equipment malfunction. Stored water may have contained free oil and detectable amounts of some dissolved organic constituents including benzene. Stored wastewater would be sampled and pumped back into the WWTP for treatment upon capacity availability. The Primary Basin will no longer be permitted for use as a discharge impoundment for wastewater and stormwater. This project would not affect any aspect of the environment and requires no new construction. All post closure activities including groundwater monitoring, monitoring of the synthetic liner system, and monitoring of the leachate/leak detection system which will continue to be consistent with the Post Closure Permit and will not result in any physical changes. There are no proposed physical changes to the facility that were not included in the previously adopted Initial Study/Negative Declaration, for which the prepared addendum is updating.

Rodeo

Contra Costa

San Francisco Bay Area

Contra Costa