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1 SAP/QAPP Addendum <br /> O Lodi-125 N Stockton <br /> Final <br /> March 24,2025 <br /> SITE-SPECIFIC QAPP WORKSHEET #12 (CONTINUED) <br /> MEASUREMENT PERFORMANCE CRITERIA <br /> Matrix Soil Gas, <br /> Sub-Slab Soil Vapor <br /> Analytical Group Helium <br /> Concentration NA <br /> Level <br /> QC Sample and/or QC Sample Assesses <br /> Sampling Laboratory DQIs Measurement Performance Criteria Activity Used to Error for Sampling(S), <br /> Procedurea SOP Reference Assess Measurement Analytical(A),or both <br /> Performance (S&A <br /> Various Eurofins Air Toxics Precision <— 50%RPD Field duplicate S &A <br /> SOP#8 <br /> Various Eurofins Air Toxics Accuracy No Analytes > QL Method blank A <br /> SOP#8 <br /> Eurofins Air Toxics Accuracy, 70-130%R <br /> Various SOP #8 Precision 25%RPD LCS/LCSD S&A <br /> Data completeness is <br /> determined by the <br /> amount of data not <br /> Various Eurofins Air Toxics Completeness > 90% qualified as rejected S &A <br /> SOP#8 — after validation divided <br /> by the amount of data <br /> planned to be <br /> generated. <br /> 30 <br />