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Programmatic Sampling and Analysis Plan Project Number:60657245 • identifies the areas where PFAS-containing materials are stored, used, and/or disposed • details the various potential pathways (current and historic) for discharge of PFAS from your facility and the nature of potential PFAS contamination in the surface and subsurface soil, groundwater, stormwater, and if the facility operates an onsite wastewater treatment plant, the plant influent and effluent Based on historical information reviewed and the results of the interview process, the boundaries of the study area are defined as the areas of concern described in the Work Plan. Develop the Analytical Approach: Eurofins Lancaster has been tasked to perform the analytical work for this project. As required by Order WQ 2021-0006-DWQ (California Water Boards, 2021), this laboratory is accredited by the California Laboratory Accreditation Program (ELAP) to perform the method compliant with DoD QSM 5.3 (or most recent). The laboratory will analyze for the PFAS list provided in Table 1 and must meet the associated target reporting limits. Specify Performance or Acceptance Criteria: The acceptable quality control criteria compliant with Table B-15 of DoD QSM version 5.3 (or most recent). The laboratory must use in-house acceptance criteria for criteria not outlined in the DoD QSM. At a minimum, the PFAS analyte list provided in Table 1 must be reported. The results of the analytical testing will be subjected to Stage 2B data validation procedures. Data are determined to be valid if the specific limits on precision, accuracy, representativeness, completeness, comparability, and sensitivity are achieved. Outlier field or laboratory results may be evaluated using an appropriate statistical test. The quality of the data will be assessed through the validation procedures described in Section 2.4. Develop the Plan for Obtaining Data: Soil and water samples will be collected as described in Section 3 and analyzed as described in Section 4. Measurement Quality Objectives Identifying data quality indicators (DQIs) and establishing quality control (QC) samples and performance criteria to assess the DQIs are key components of project planning and development. These components demonstrate an understanding of the data to support project decisions and help to establish there is a well-defined system in place to assess the DQOs. Data collected will be used to make informed decisions regarding the nature and extent of contamination, remedy selection, and the effectiveness of the selected remedy. These uses require high quality data that is qualitatively and quantitatively precise, accurate, representative, comparable, adequately sensitive, and legally defensible. The PARCCs parameters (precision, accuracy, representativeness, completeness, comparability, and sensitivity) outlined below are used to interpret and assess specific data quality needs for each sample matrix and analytical operation. Precision: Precision is a measure of mutual agreement between duplicate samples, or co- located sample measurements of the same analyte. The closer the numerical values of the measurements are to each other, the more precise the measurement. Precision for a single analyte will be expressed as a relative percentage difference (RPD) between results of field duplicate samples, laboratory duplicate samples, or matrix spike duplicate (MSD) in cases where both results are greater than five times the reporting limit (RL). RPD is defined as follows: AECOM 4