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Revised Workplan-Additional Site Investigation for PFAS BSK Project E20-016-01F Stockton Metropolitan Airport(SCK) March 1, 2023 Stockton, California Page 4 to, spilled, or released in any way to lands of a facility, then a Preliminary Site Investigation Workplan is required for those locations where PFAS was released to land. The initial March 20, 2019 Order required that a Workplan for a one-time preliminary site inspection for PFAS impacts be submitted to the CVRWQCB by May 19, 2019. The California Airports Council (CAC) requested an extension to the compliance deadlines stated in the Order on April 23, 2019. The SWRCB granted an extension of 60 additional days to the original Workplan due date for Small-Hub and Non-Hub airports. SCK is considered a Non-Hub airport. BSK conducted a Site visit at SCK on April 25, 2019,and met with Mr. Russell Stark,former Airport Director, and Mr. Edward Martell, Fire Chief of Montezuma Fire Department (MFD) Station 18-2. BSK toured the following five locations where AFFF has been historically or currently stored, used, and/or discharged: (1) Awash rack located at the southeast end of the facility,to the south of the runways("Wash Rack") (2) A former runway near the present cargo area at the north end of the facility that was removed from service in about 2002 ("Former Runway") (3) The Atlantic Aviation Hangar (4) MFD Station 18-2 (5) A Fire Suppression (FS) Materials Storage Shed that is located 120 ft northwest of MFD Station 18-2, at the west end of"Hangar J." Figure 2 shows the locations of the five AFFF Use Areas that were identified during BSK's Site visit to be evaluated for potential PFAS investigation. Based on Site practices, containment, and/or the findings of no known AFFF releases, Fire Station 18-2,and the Materials Storage Building warranted no further action and were not included in the scope of investigative activities. The scope of PFAS investigative activities did however include: • the Wash Rack(Potential Release Area "PRA 1"), • the Former Runway("PRA 2"), and • the Atlantic Aviation Hangar("PRA 3"). Following a June 2020 PFAS investigation at SCK, BSK submitted a Revised PSI titled "Revised Report Preliminary Site Investigations for PFAS Stockton Metropolitan Airport (SCK) Stockton, California" dated October 15, 2021, and revised on May 1, 2022. The CVRWQCB concurred with BSK's recommendations in the revised report in their letters dated March 2, 2022. Recommendations in BSK's Revised PSI concluded the following: