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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:Safety Kleen <br />Project:MO32012-ripon; MO32012 <br />Date Analyzed:06/02/2021 <br />Date Prepared:06/01/2021 <br />WorkOrder:2106020 <br />BatchID:222511 <br />Analytical Method:SW6020 <br />Unit:mg/kg <br />Sample ID:MB/LCS/LCSD-222511 <br />Instrument:ICP-MS4 <br />Matrix:Soil <br />Extraction Method:SW3050B <br />QC Summary Report for Metals <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 />Antimony 50.0 48.1 50 100 96 75-125 3.88 20 <br />Arsenic 50.5 50.9 50 101 102 75-125 0.734 20 <br />Barium 518 507 500 104 101 75-125 2.26 20 <br />Beryllium 49.7 49.9 50 99 100 75-125 0.558 20 <br />Cadmium 50.9 49.4 50 102 99 75-125 2.92 20 <br />Chromium 50.0 49.7 50 100 99 75-125 0.455 20 <br />Cobalt 52.2 49.8 50 104 100 75-125 4.76 20 <br />Copper 50.1 50.2 50 100 100 75-125 0.213 20 <br />Lead 49.3 48.3 50 99 97 75-125 2.21 20 <br />Mercury 1.28 1.24 1.25 102 99 75-125 3.41 20 <br />Molybdenum 51.2 49.2 50 102 98 75-125 4.01 20 <br />Nickel 50.4 50.5 50 101 101 75-125 0.307 20 <br />Selenium 51.0 50.8 50 102 102 75-125 0.393 20 <br />Silver 48.8 46.9 50 98 94 75-125 3.97 20 <br />Thallium 50.0 48.4 50 100 97 75-125 3.42 20 <br />Vanadium 51.3 50.7 50 103 101 75-125 1.10 20 <br />Zinc 503 497 500 101 99 75-125 1.15 20 <br />Surrogate Recovery <br />Terbium 533 511 500 107 102 70-130 4.22 20 <br />CA ELAP 1644 • NELAP 4033ORELAP <br />Page 6 of 10