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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 6 4. Methods to evaluate whether the PFAS groundwater plume has migrated off-site and caused or contributed to the detection of PFAS compounds in municipal supply well CA3910012 089 089 located within 4,000 feet northeast of the Airport; 5. Information regarding the storm drain network, stormwater flow directions, and any stormwater retention and/or treatment system available at the Airport, to evaluate the potential of PFAS compounds being transported off-site via stormwater; 6. Sampling and Analysis Plan (SAP)for compounds and parameters specified in Tables 2 and 3 at the end of this letter. The SAP shall include the following but not limited to: a. Field sampling methods that are consistent with the State Water Board's Per- and Polyfluoroalkyl Substances (PFAS) Sampling Guidelines for Non-Drinking Water; b. Lab analytical method which reports the 31 target analytes contained in Table 2 and the analytical laboratory accredited by the California Environmental Laboratory Accreditation Program that is capable to conduct the PFAS analysis compliant with the quality control requirements of Department of Defense Table B-15 of Quality Systems Manual(QSM)5. c.Analytical methods for the field parameters and general groundwater chemistry parameters in Table 3 that are appropriate for the expected concentrations. Finally, the Work Plan must be uploaded in a searchable portable document format (PDF) into GeoTracker via the ESI Portal by COB November 2, 2022. GeoTracker ESI guidance, general information, and Help Desk assistance can be found on the ESI homepage6." BSK issued a November 2, 2022, document titled "Workplan, Additional Site Investigation, Per- and Polyfluoroalkyl Substances in Soil and Groundwater, Stockton Metropolitan Airport (SCK), 5000 South Airport Way,Stockton,California,(GeoTracker#T10000012778), (WDR Order No.WQ-2019-0005-DWQ)", for further investigation at Stockton Metropolitan Airport. Following their review of BSK's November 2, 2022 workplan, the Central Valley Regional Water Quality Control Board (CVRWQCB) issued a January 13, 2023, letter titled "Response to Additional PFAS Site Investigation Work Plan Stockton Municipal Airport(T10000012778)5000 S. Airoport[sic] Way, Stockton, California". The letter contains the CVRWQCB's comments regarding BSK's November 2, 2022 workplan. This revised workplan addresses those comments. The following sections describe the environmental setting, purpose of the investigation, project approach, scope of work to be performed at SCK to delineate the lateral and vertical extent of soil and groundwater