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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:AdvancedGeo, Inc. <br />Project:Labarber Property <br />Date Analyzed:08/27/2021 - 08/28/2021 <br />Date Prepared:08/27/2021 - 08/28/2021 <br />WorkOrder:2108C39 <br />BatchID:228688 <br />Analytical Method:E524.3 <br />Unit:µg/L <br />Sample ID:MB/LCS/LCSD-228688 <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 0.0200 --- <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 1.10 1 110 70-130 <br />4-BFB 0.953 1 95 70-130 <br />1,2-dichlorobenzene-d4 1.08 1 108 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 0.0847 0.0996 0.10 85 100 70-130 16.1 20 <br />Surrogate Recovery <br />tert-Butyl methyl ether-d3 0.977 1.09 1 98 109 70-130 11.0 20 <br />4-BFB 0.976 0.972 1 98 97 70-130 0.330 20 <br />1,2-dichlorobenzene-d4 1.02 1.05 1 102 105 70-130 2.65 20 <br />CA ELAP 1644 <br />Page 6 of 10