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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" I <br /> http://www.niccampbell.com/E-mail:main@mccampbell.com <br /> Quality Control Report <br /> Client: AdvancedGeo,Inc. WorkOrder: 2103D57 <br /> Date Prepared: 03/26/2021 BatchID: 218199 <br /> Date Analyzed: 03/26/2021 Extraction Method: E524.2 <br /> Instrument: GC18 Analytical Method: E524.2 <br /> Matrix: Drinking Water Unit: µg/L <br /> Project: Rivera Property Sample ID: MB/LCS/LCSD-218199 <br /> QC Summary Report for E524.2 <br /> Analyte MB MDL RL SPK MB SS MB SS <br /> Result Val %REC Limits <br /> 1,2-Dibromo-3-chloropropane ND 0.0690 0.200 - - - <br /> Surrogate Recovery <br /> 4-BFB 2.37 2.5 95 70-130 <br /> Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD <br /> Result Result Val %REC %REC Limits Limit <br /> 1,2-13ibromo-3-chloropropane 2.14 2.16 2 107 108 70-130 0.988 20 <br /> Surrogate Recovery <br /> 4-BFB 2.80 2.68 2.5 112 107 70-130 4.37 20 <br /> CA ELAP 1644 <br /> Page 6 of 10 <br />