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Quality Control Report <br />McCampbell Analytical, Inc.1534 Willow Pass Road, Pittsburg, CA 94565-1701 <br />Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 <br />http://www.mccampbell.com / E-mail: main@mccampbell.com"When Quality Counts" <br />Client:Terracon <br />Project:NA207102; Cherokee;Lodi CA <br />Date Analyzed:02/16/2021 <br />Date Prepared:02/16/2021 <br />WorkOrder:2102533 <br />BatchID:215461 <br />Analytical Method:E524.3 <br />Unit:μg/L <br />Sample ID:MB/LCS/LCSD-215461 <br />2102533-002AMS/MSD <br />Instrument:GC45 <br />Matrix:Drinking Water <br />Extraction Method:E524.3 <br />QC Summary Report for E524.3 <br />Analyte MB <br />Result <br />MDL RL SPK <br />Val <br />MB SS <br />%REC <br />MB SS <br />Limits <br />1,2-Dibromo-3-chloropropane ND 0.00630 0.0100 --- <br />1,2-Dibromoethane (EDB)ND 0.0150 0.0200 --- <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 0.979 1 98 70-130 <br />4-BFB 0.746 1 75 70-130 <br />1,2-dichlorobenzene-d4 0.951 1 95 70-130 <br />Analyte LCS <br />Result <br />LCSD <br />Result <br />SPK <br />Val <br />LCS <br />%REC <br />LCSD <br />%REC <br />LCS/LCSD <br />Limits <br />RPD RPD <br />Limit <br />1,2-Dibromo-3-chloropropane 0.0786 0.0744 0.10 79 74 70-130 5.54 20 <br />1,2-Dibromoethane (EDB)0.0984 0.0868 0.10 98 87 70-130 12.5 20 <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 1.25 1.01 1 125 101 70-130 22.0,F3 20 <br />4-BFB 0.819 0.819 1 82 82 70-130 0.0954 20 <br />1,2-dichlorobenzene-d4 0.942 0.990 1 94 99 70-130 4.99 20 <br />Analyte MS <br />Result <br />MSD <br />Result <br />SPK <br />Val <br />SPKRef <br />Val <br />MS <br />%REC <br />MSD <br />%REC <br />MS/MSD <br /> Limits <br />RPD RPD <br />Limit <br />MS <br />DF <br />1,2-Dibromo-3-chloropropane 0.213 0.211 0.10 0.117 96 95 70-130 0.625 301 <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 1.17 1.22 11 117 122 70-130 3.57 30 <br />4-BFB 0.799 0.805 11 80 81 70-130 0.843 30 <br />1,2-dichlorobenzene-d4 1.05 1.06 11 105 106 70-130 0.896 30 <br />CA ELAP 1644 <br />Page 7 of 11