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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:San Joaquin County Public Health Services <br />Date Analyzed:08/10/2023 <br />Date Prepared:08/07/2023 <br />WorkOrder:2308071 <br />BatchID:275359 <br />Analytical Method:SW6020 <br />Unit:mg/L <br />Sample ID:MB/LCS/LCSD-275359 <br />Instrument:ICP-MS3 <br />Matrix:Soil <br />Extraction Method:CA Title 22 <br />QC Summary Report for Metals (STLC) <br />Analyte MB <br />Result <br />MDL RL <br />Chromium ND 0.10 0.10 --- <br />Lead ND 0.10 0.10 --- <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 />Chromium 9.6 9.6 10 96 96 75-125 0.104 20 <br />Lead 9.7 9.6 10 97 96 75-125 1.49 20 <br />CA ELAP 1644 • NELAP 4033ORELAP <br />Page 6 of 10