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1534 Willow Pass Road,Pittsburg,CA 94565-1701 <br /> _ M c C a m p b e I l Analytical, Inc. Toll Free Telephone:(877)252-9262/Fax:(925)252-9269 <br /> "When Quality Counts" http://www.mccampbell.com/E-mail:main@mccampbell.com <br /> Quality Control Report <br /> Client: BSK Associates Engineers&Laboratories WorkOrder: 2312D25 <br /> Date Prepared: 12/27/2023 BatchID: 284839 <br /> Date Analyzed: 01/03/2024 Extraction Method: DOD QSM <br /> Instrument: LC-MS3 Analytical Method: DOD QSM <br /> Matrix: Soil Unit: µg/Kg <br /> Project: E200160117; Stockton Airport PFAS Samples Sample ID: MB/LCS/LCSD-284839 <br /> QC Summary Report for DOD QSM 5.3 <br /> Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD <br /> Result Result Val %REC %REC Limits Limit <br /> PFPeS 4.8 5.6 5 95 113 73-123 17.0 30 <br /> PFTeDA 5.3 5.7 5 106 113 69-133 6.46 30 <br /> PFTrDA 5.5 6.1 5 ill 122 66-139 9.70 30 <br /> PFUnA 5.2 5.7 5 104 114 64-136 9.18 30 <br /> DoD-ELAP Cert#L22-757•CA ELAP 1644 <br /> Page 17 of 22 <br />