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AECOMAECOM <br /> 3995 Via Oro Avenue <br /> Long Beach,CA 90810 <br /> aecom.com <br /> January 13, 2023 <br /> Mr. Jose Lopez <br /> Water Resources Control Engineer <br /> Central Valley Regional Water <br /> Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, CA 95670 <br /> Responses to Comments on Work Plan for Per-and Polyfluoroalkyl Substances (PFAS) Sampling and <br /> Analysis (PFAS Work Plan), dated August 31, 2021 <br /> Tesoro Stockton Bulk Terminal, 3003 Navy Drive, Stockton, San Joaquin County, California <br /> Dear Mr. Lopez, <br /> This letter responds to the comments from the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) included in the Review Of Preliminary Site Investigation Work Plan— Tesoro Stockton Bulk <br /> Fuel Terminal, Stockton, San Joaquin County— Global Identification SL375453650 (PFAS Workplan <br /> Comment Letter), dated October 18, 2022. The responses are consistent with the discussion in the <br /> meeting conducted with the CVRWQCB on November 18, 2022 between representatives of the <br /> CVRWQCB, Tesoro Logistics Operations LLC, and AECOM.As such, the responses to comments below <br /> are considered to be amendments and additions to the PFAS Work Plan dated August 31, 2021, as <br /> agreed in the November 18, 2022, meeting. <br /> The CVRWQCB comments' are shown in italics below followed by our responses. <br /> Comment 1: Section 2.1 of the Work Plan briefly describes two existing and one historical FFSs. <br /> Please provide the following additional information for each system: <br /> a. Drawings or schematics of the system layout. <br /> b. Contingency measures, if available, to prevent chemical releases (e.g., leak detection systems, <br /> secondary containments, and the presence of liners). <br /> c. Records of past(annual) testing or use events, including the time, names and quantities of foams <br /> used, and waste disposal practices in each event. <br /> d. Copies of safety data sheets for the foams historically or currently stored or used on Site. <br /> Response: <br /> a. The available schematics of the fire foam system (FFS)at the West Terminal and East Annex are <br /> attached as Figures 1 and 2, respectively.These two attachments represent the extent of the available <br /> schematics and drawings pertaining to the FFS. <br /> b. There are three storage locations at Tesoro Stockton, shown on Figure 3(West Terminal)and Figure 4 <br /> (East Annex). Foam is stored in designated tanks.The tank on the West Terminal is located on a <br /> concrete pad which is surrounded by asphalt pavement which prevents direct release to the ground <br /> surface.On the East Annex,the foam storage tank is also located on a concrete pad and the <br /> Although the comments are unnumbered in the CVRWQCB letter dated October 18,2022,AECOM has numbered these comments <br /> for ease of reference. <br /> aecom.com <br /> 1/5 <br />