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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:Hobman Property <br />Date Analyzed:12/05/2020 <br />Date Prepared:12/05/2020 <br />WorkOrder:2012020 <br />BatchID:210662 <br />Analytical Method:E524.2 <br />Unit:µg/L <br />Sample ID:MB/LCS/LCSD-210662 <br />Instrument:GC16 <br />Matrix:Drinking Water <br />Extraction Method:E524.2 <br />QC Summary Report for E524.2 <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 0.0690 0.200 --- <br />Surrogate Recovery <br />4-BFB 2.20 2.5 88 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 2.49 1.99 2 125 100 70-130 22.1,F2 20 <br />Surrogate Recovery <br />4-BFB 2.28 2.25 2.5 91 90 70-130 1.23 20 <br />CA ELAP 1644 <br />Page 5 of 9