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Stockton Municipal Airport - 2 - 3 April 2023 J10000012778) boring; for monitoring wells, collect soil samples in the capillary fringe right above the groundwater table. 4) Summarize the PFAS soil and groundwater results in a Progress Report and submit the Progress Report to the Central Valley Water Board. 5) Summarize the Airport drainage network information; within 60 days after receiving the results of an on-going drainage study at the Airport, submit the drainage network information and results of the drainage study, and as necessary, propose stormwater sampling activities to the Central Valley Water Board. Phase II: 6) Conduct vertical groundwater profiling by advancing four borings based on Phase I results and collect groundwater samples at a 10 feet interval from the groundwater table to 40 feet below static groundwater level in each boring for PFAS analysis. 7) Install two monitoring wells within/close to PRA-1 and two monitoring wells within/close to PRA-2 based on the groundwater profiling results and collect groundwater samples for PFAS analysis. 8) Collect soil samples at 1, 5, and 10 feet bgs, respectively, from each boring and monitoring well installed in Items 6) and 7) above for PFAS analysis. 9) Summarize the Phase I and Phase II soil and groundwater sampling results in a Final Report and submit the Final Report to the Central Valley Water Board. In addition to Items 1) through 9) above, BSK indicates in the RTC that the two City of Stockton supply wells (Well 04 and Well 05) located along the Airport's western boundary will be sampled for PFAS after receiving the City of Stockton's approval. According to Section 7, Project Schedule in the Revised Work Plan, the Airport will apply for the relevant Federal Aviation Administration (FAA) permit for the proposed field work after receiving the Central Valley Water Board concurrence with the Revised Work Plan; accordingly, the Phase I activities will start within about 90 to 180 days after the receipt of the Central Valley Water Board concurrence, and the overall project will be completed within 12 months. Central Valley Water Board staff concurs with the scope of work, including its associated schedule, presented in the Revised Work Plan and RTC. Please proceed with implementing the proposed investigations. Following the proposed schedule, please submit the Progress Report by 15 September 2023 and the Final Report by 3 April 2024. If the timeframe of the FAA permit application process prevents the timely submittal of the Progress Report and/or Final Report, you may contact the Central Valley Water Board staff for a reasonable due date extension.