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Workplan for PFAS Sampling and Analysis Project Number:60657245 1 . Introduction and Site Background AECOM Technical Services, Inc. (AECOM) has prepared this Work Plan for Per- and Polyfluoroalkyl Substances (PFAS) Sampling and Analysis (Work Plan) on behalf of Tesoro Logistics Operations LLC (Tesoro) for the Tesoro Terminal Facility at 3003 Navy Drive, Stockton, California (Site, Figure 1-1). This Work Plan was prepared in accordance with State Water Resources Control Board (SWRCB) Order WQ 2021-0006-DWQ dated April 29, 2021 and SWRCB's letter dated May 7, 2021,which granted an extension to August 31, 2021 to submit this Work Plan. 1 .1 Site Description The Site is located within a terminal lease area of the Port of Stockton,California.Other petroleum terminal and pipeline facility lease holders include the former Time Oil Facility,the Kinder Morgan Energy Partners, L.P. Stockton Terminal, Buckeye Terminals, LLC(Buckeye)Terminal, and NuStar Terminals Operations Partnership L.P.facility. Fuel distribution activities began in the area in the 1940s and expanded during the 1950s and 1960s.The Site currently consists of two areas, the West Terminal at 3003 Navy Drive and the East Annex at 2560 West Washington Street (Figures 1-2 and 1-3). The West Terminal serves as a petroleum product distribution source to supply gasoline and diesel fuels to the local area. Finished product is received by pipeline,stored in tanks and distributed by bulk tank trucks for delivery to retail service stations and other commercial facilities. The West Terminal contains a tank farm consisting of ten vertical and two horizontal aboveground tanks enclosed within a large concrete dike. A tank truck loading rack (truck rack) is located near the main entrance to the facility along Navy Drive. The East Annex is located northeast of the West Terminal at the northwest corner of the intersection of West Washington Street and Stork Road. The East Annex is a rail offloading station that was recently added to the Site's operation. Ethanol and renewable diesel are primarily received and unloaded from rail cars at the East Annex. There is also an offloading area for delivery by trucks at the East Annex. The Port of Stockton holds the National Pollution Discharge Elimination System (NPDES) permit for the discharge of stormwater from this Site as well as other Port of Stockton tenant facilities. Stormwater control areas are located at east, west, and south corners of the West Terminal. Undiked areas of the West Terminal do not contain storm drains. Water accumulating in diked areas of the Tank Farm is drained via valves which remain closed until approved to open. Drainage from the Tank Farm requires visual inspection of the water to be released to the Port of Stockton conveyances, while material captured in other diked areas of the Site are directed to a central sump and into an on-site double-walled 6,000-gallon underground tank that then pumps to aboveground oily water Tank 420.Material from Tank 420 is trucked to the Tesoro Carson Refinery in Carson, California for oil recovery and treatment. Sheet flow from parking lots and driveways will accumulate near the northwest and southwest exit gates and can be pumped by terminal operators under Navy Drive to the adjacent Port of Stockton ditches. From there, stormwater drains to a Port of Stockton holding pond, located across Navy Drive to the south of the Site(Figure 1-2). Stormwater at the East Annex drains to an on-site bermed spill containment pond. The materials in the containment pond are checked before these materials are pumped to the Port of Stockton drainage system. Industrial and commercial operations are located adjacent to the Site. Residential areas are located across the main branch of the San Joaquin River to the north and to the east near the Route 4 Freeway. 1 .2 Geology Unconsolidated strata beneath the Stockton area consist primarily of interbedded clays, silts, and fine-grained sands of the Quaternary age flood basin deposits.The flood basin deposits are approximately 1,000 feet thick in the Stockton area. There is considerable variability in the distribution and percentage of fine- and coarse-grained sediments in the Site vicinity. These deposits are interpreted to have been deposited by fluvial (water borne) processes as overbank flood plain deposits outside the main channel of the San Joaquin River. Based on current understanding of the depositional environment, preferential pathways may trend to the south. Prepared for:Tesoro Logistics Operations LLC AECOM 4