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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.mccarnpbell.com/E-mail:main@mccampbell.com <br /> Quality Control Report <br /> Client: AdvancedGeo,Inc. WorkOrder: 2508906 <br /> Date Prepared: 08/16/2025 BatchID: 323839 <br /> Date Analyzed: 08/16/2025 Extraction Method: E524.3 <br /> Instrument: GC54 Analytical Method: E524.3 <br /> Matrix: Drinking Water Unit: n/L <br /> Project: James Lee Property Sample ID: MB/LCS/LCSD-323839 <br /> QC Summary Report for E524.3 <br /> Analyte MB MDL RL SPK MB IS/SS MB IS/SS <br /> Result Val %REC Limits <br /> 1,2-Dibromo-3-chloropropane ND 0.0074 0.010 - - - <br /> Surrogate Recovery <br /> 4-BFB 0.95 1 95 70-130 <br /> 1,2-dichlorobenzene-d4 1.0 1 101 70-130 <br /> Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD <br /> Result Result Val %REC %REC Limits Limit <br /> 1,2-Dibromo-3-chloropropane 0.083 0.094 0.10 83 94 70-130 11.9 20 <br /> Surrogate Recovery <br /> 4-BFB 0.95 0.96 1 95 96 70-130 0.695 20 <br /> 1,2-dichlorobenzene-d4 1.0 1.0 1 101 101 70-130 0.0898 20 <br /> CA ELAP 1644 <br /> Page 7 of 12 <br />