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1534 Willow Pass Road,Pittsburg,CA 94565-1701 <br /> _ M c C a m p b e I I 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: Kirkwood Meadows Public Untility District WorkOrder: 2604713 <br /> Date Prepared: 04/10/2026 BatchID: 339413 <br /> Date Analyzed: 04/10/2026 Extraction Method: SW3550B <br /> Instrument: GC48 Analytical Method: SW8270E <br /> Matrix: Soil Unit: mg/Kg <br /> Project: Kirkwood WWTP Sample ID: MB/LCS/LCSD-339413 <br /> QC Summary Report for SW8270E <br /> Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD <br /> Result Result Val %REC %REC Limits Limit <br /> Surrogate Recovery <br /> 2-Fluorophenol 1.3 1.3 1.25 101 102 70-130 1.27 30 <br /> Phenol-d5 1.1 1.1 1.25 88 88 70-130 0.538 30 <br /> Nitrobenzene-d5 1.2 1.3 1.25 96 103 60-130 6.79 30 <br /> 2-Fluorobiphenyl 1.3 1.2 1.25 105 99 60-130 5.80 30 <br /> 2,4,6-Tribromophenol 1.5 1.5 1.25 119 123 30-130 3.07 30 <br /> 4-TerphenyW14 1.3 1.4 1.25 107 110 40-130 2.46 30 <br /> CA ELAP 1644.ORELAP(NELAP)4033 <br /> Page 24 of 36 <br />