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Memorandum PPS0128221203ATL 1 Subject USPS Stockton Vehicle Maintenance Facility Used Oil Aboveground Storage Tank System Transfer Pipe Description Project Name Stockton VMF Piping Containment Method Attention Garrett Backus San Joaquin County Environmental Health Department From Caitlin Santinelli/Jacobs Date February 3, 2022 Copies to Patrick Langsjoen/USPS Judy Wingo-Stalinger/USPS Sydney Randell/USPS Sean Smith/Jacobs Jeff Enzminger/Jacobs Annalisa Henderson/Jacobs This information is being submitted in response to your request via email on November 22, 2021 regarding Certified Unified Program Agencies approval of alternative piping containment method. The 500-gallon used oil aboveground storage tank (AST) and associated 1-inch-diameter steel transfer piping system at the United States Postal Service (USPS) vehicle maintenance facility (VMF) in Stockton, California likely was installed in 1999. The tank is located in a separate 20-foot by 22-foot room of the VMF building The tank room also contains two compressors, a new oil tank, storage drums, and two old oil tanks that are no longer in use. The concrete floor is in good condition and contains two drains, both of which are plugged. Jacobs confirmed these details during a site visit on January 6, 2022, as part of the Stockton VMF Piping Containment Method project. The doorway to the tank room has a raised curb that appears to be capable of containing small leaks or spills that may occur in the tank room. The total piping run in the tank room is approximately 50 feet with 7 threaded connections. Starting at the tank, the transfer piping run exits the top of the tank, runs up the east wall of the room, and makes a 90-degree turn west along the ceiling. It then takes another 90-degree bend south, continuing at ceiling level until it penetrates the south wall of the room; this wall is an interior wall of the VMF building. The transfer piping then enters an adjacent 36-foot by 20-foot ,where it runs through two 90- degree bends and then continues south along the ceiling of the room. There are no drains in the tire room. The total piping run in the tire room is approximately 22 feet with 3 threaded connections. The piping run exits the tire room when it passes over a partial-height interior wall into the transfer pump area, which appears to be used for tool and parts storage. The piping continues south along the ceiling of this space for 12 feet, then takes a 90-degree bend and runs west along the ceiling until it reaches a full-height interior wall. This is where it changes direction and proceeds down the wall to the transfer pump. The transfer pump area is approximately 40 feet by 20 feet and is directly adjacent to the main service area of the VMF building. A trench drain with oil-water separator separates these two spaces. The total piping run in this space is approximately 50 feet with 3 threaded connections. Overall, there are approximately 118 feet of used oil transfer pipe with 13 threaded connections. Refer to the attached drawings and photographs showing the AST transfer piping system.