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3.2.7 Step 7—Develop a Plan for Obtaining Data Sampling activities will be performed as described in the Work Plan. The following methods will be used for the VI investigation. Analyte Method VOCs USEPA TO-15 and TO-15 selective ion monitoring(SIM) Helium American Society for Testing and Materials(ASTM)D1946 The following methods will be used for groundwater monitoring. Analyte Method VOCs USEPA 8260B 3.3 PARCCS Overview 3.3.1 Introduction This QAPP addresses both field and laboratory activities associated with the collection and analytical analysis of samples in support of project DQOs. Field sampling and laboratory testing will be performed according to the relevant SOPS. QA objectives are formally measured through the computation of performance measures known as DQIs. The DQIs for measurement data are expressed in terms of PARCCS. Evaluation of DQIs provides the mechanism for ongoing control and evaluation of data quality throughout the project and ultimately will be used to define the data quality achieved for the various measurement parameters. The field QA/QC program will be accomplished through the collection of trip blanks, equipment blanks, field duplicates, and ambient air samples as applicable. The analytical QA/QC program will be assessed through the internal laboratory QC performed, including method blanks, matrix spike (MS)/MS duplicate (MSD) recoveries and relative percent differences (RPDs), laboratory control sample (LCS)/LCS duplicate (LCSD) recoveries and RPDs, and surrogate recoveries, as applicable to the analytical method. The following sections describe the DQIs in detail. 3.3.2 Precision Precision refers to the reproducibility or degree of agreement among duplicate measurements of a single analyte. The closer the numerical values of the measurements, the more precise the measurement. Poor precision stems from random errors (i.e., mechanisms which can cause both high and low measurement errors at random). Appendix C 8