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The PFAS analyte list, which includes 18 PFAS compounds, was presented. Analysis will be completed by a DoD-Environmental Laboratory Accreditation (ELAP)/National Environmental Laboratory Accreditation Program (NELAP)-certified laboratory. The lab is also CA-ELAP certified. A Level III deliverable will be received from the laboratory, and data will undergo Stage 2b data validation as defined in the DoD General Data Validation Guidelines. A general outline of the schedule was presented. The Final UFP-QAPP will be provided with the responses to CA Water Board comments in April 2021. The field investigation is tentatively planned for May to June 2021. Note: This tentative schedule may be adjusted based on planned re -submittal of the Draft Final QAPP, as discussed below. Under normal circumstances, the team would field verify the proposed locations during a site reconnaissance walk conducted after the TPP meeting; however, that is not possible given the current travel restrictions due to the COVID-19 pandemic. Instead, the site walk will be performed during the mark -out and utility clearing. Open Discussion (Slide 24): • Due to the presence of a former wash rack, the SI sample locations may be adjusted to determine the presence or absence of PFAS from this potential source area. Mr. Pierce suggested that one of the boring locations could be shifted to obtain better coverage of this area. Ms. Stinger will send out revised UFP-QAPP Worksheets and figures to reflect the new potential source area (former wash rack) and associated sample location adjustments. • Existing wells located at the FMS #24, southwest corner of the CAARNG facility, may be gauged to support the determination of a northeast groundwater gradient. Mr. Brian Pierskalla (CAARNG) confirmed a November 2020 groundwater monitoring event at FMS #24 showed a northeast groundwater flow. This groundwater monitoring report is still in draft phase but will be published soon. He noted the nine existing monitoring wells at FMS #24 will likely be accessible for gauging during the SI. He re -stated all six monitoring wells near the former wash rack/underground storage tank have been abandoned. • Ms. Stinger asked about CA Water Board's position on the timeframe for leaving a temporary well open and the well permitting process. Marcus Pierce (CA Water Board) stated that this was more a San Joaquin County issue but given that the temporary wells will likely be abandoned within a week and the facility property is secured, he had no issues with use of a CERCLA waiver to allow installation of the proposed temporary wells. However a well permit will be required for permanent well installation, and the process for obtaining a permit from San Joaquin County may delay the project by a year. Revised language in the QAPP is also needed if a well permit is pursued. To avoid significant project delays, all parties were in agreement that a CERCLA waiver would be invoked to allow installation of temporary wells. • Mr. Murphy (CA Water Board) mentioned that there was an ongoing PFAS investigation at the adjoining municipal airport. However, the status of the investigation is unknown. • Mr. Pierce stated that per state requirements, the final SI UFP-QAPP will need to be stamped by a California -licensed Professional Engineer (PE). Ms. Stinger will incorporate this requirement into the final deliverable. • Mr. Pierce requested the full package of Standard Operating Procedures. Ms. Stinger will provide this package in the next submittal. • Mr. Murphy indicated that the 30 -day review timeframe for the UFP-QAPP was reasonable and that he already had preliminary comments ready. Dr. Packer suggested that CA Water Board hold off on submitting comments until after reviewing forthcoming revised Stockton QAPP worksheets, to be revised per suggestions made during this TPP1 &2 meeting. • Ms. Stinger asked about the utility clearance process for Stockton AASF. Mr. Pierskalla believes that a private utility locator performed clearance at the FMS site and was not sure if the local 811 operator would be able to access the facility. Ms. Stinger requested the contact information for a local person with knowledge about the facility's utility clearance process. • Mr. John Oberg (CAARNG) confirmed that the investigation -derived waste (IDW) management plan was similar to other CAARNG sites. IDW soil and water will be containerized in drums. If the analytical results show the associated sample(s) is below Office of the Secretary of Defense [OSD] screening levels, IDW may be returned to the ground surface at the source of generation. Otherwise IDW will be ARNG PA/SI, Stockton AASF CA 3 24 February 2021