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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: Kirkwood Meadows Public Untility District WorkOrder: 2604713 <br /> Date Prepared: 04/10/2026 BatchID: 339405 <br /> Date Analyzed: 04/12/2026-04/13/2026 Extraction Method: SW5030B <br /> Instrument: GC45,GC49 Analytical Method: SW8260D <br /> Matrix: Soil Unit: mg/kg <br /> Project: Kirkwood WWTP Sample ID: MB/LCS/LCSD-339405 <br /> QC Summary Report for SW8260D <br /> Analyte MB MDL RL SPK MB IS/SS MB IS/SS <br /> Result Val %REC Limits <br /> Surrogate Recovery <br /> Dibromofluoromethane 0.11 0.125 87 70-140 <br /> Toluene-d8 0.14 0.125 112 70-140 <br /> 4-BFB 0.015 0.0125 119 70-140 <br /> Benzene-d6 0.10 0.1 104 70-140 <br /> Ethyl benzene-d10 0.13 0.1 125 70-140 <br /> 1,2-DCB-d4 0.097 0.1 97 70-140 <br /> (Cont.) <br /> CA ELAP 1644.ORELAP(NELAP)4033 <br /> Page 15 of 36 <br />