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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:Petralogix <br />Project:SSS/NLS-S Koster Road <br />Date Analyzed:09/10/2021 <br />Date Prepared:09/10/2021 <br />WorkOrder:2109270 <br />BatchID:229419 <br />Analytical Method:E524.3 <br />Unit:µg/L <br />Sample ID:MB/LCS/LCSD-229419 <br />2109270-001AMS/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 0.00840 0.0100 --- <br />1,2-Dibromoethane (EDB)ND 0.0150 0.0200 --- <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 0.605 1 60,F3 70-130 <br />4-BFB 1.00 1 100 70-130 <br />1,2-dichlorobenzene-d4 1.04 1 105 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 0.0771 0.0941 0.10 77 94 70-130 19.9 20 <br />1,2-Dibromoethane (EDB)0.132 0.138 0.10 132,F2 138,F2 70-130 4.66 20 <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 0.595 1.11 1 60,F3 111 70-130 60.5,F3 20 <br />4-BFB 1.06 1.03 1 106 103 70-130 2.87 20 <br />1,2-dichlorobenzene-d4 0.984 1.01 1 98 101 70-130 2.41 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 0.0756 0.0871 0.10 ND 76 87 70-130 14.2 301 <br />1,2-Dibromoethane (EDB)0.125 0.130 0.10 ND 125 131,F1 70-130 4.54 301 <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 0.564 0.643 11 56,F3 64,F3 70-130 13.0 30 <br />4-BFB 1.10 1.14 11 110 114 70-130 2.96 30 <br />1,2-dichlorobenzene-d4 1.05 1.08 11 105 108 70-130 3.15 30 <br />CA ELAP 1644 <br />Page 7 of 11