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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:Clean Harbors <br />Project:Turner Cut <br />Date Analyzed:02/27/2025 <br />Date Prepared:02/26/2025 <br />WorkOrder:2502J06 <br />BatchID:312128 <br />Analytical Method:E200.8 <br />Unit:µg/L <br />Sample ID:MB/LCS/LCSD-312128 <br />Instrument:ICP-MS4 <br />Matrix:Water <br />Extraction Method:E200.8 <br />QC Report for Metals (>1% Sediment Content) <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 250 240 250 99 98 85-115 1.07 20 <br />Arsenic 260 250 250 102 101 85-115 1.68 20 <br />Barium 2500 2500 2500 101 102 85-115 0.952 20 <br />Beryllium 250 250 250 100 100 85-115 0.355 20 <br />Cadmium 260 260 250 102 103 85-115 0.497 20 <br />Chromium 260 260 250 103 104 85-115 1.07 20 <br />Cobalt 250 250 250 100 101 85-115 1.04 20 <br />Copper 260 260 250 104 103 85-115 1.23 20 <br />Lead 250 250 250 101 102 85-115 0.801 20 <br />Molybdenum 250 250 250 101 100 85-115 0.992 20 <br />Nickel 260 260 250 104 103 85-115 1.27 20 <br />Selenium 260 260 250 104 103 85-115 1.22 20 <br />Silver 250 250 250 101 100 85-115 0.959 20 <br />Thallium 260 260 250 103 103 85-115 0.672 20 <br />Vanadium 250 260 250 102 104 85-115 1.85 20 <br />Zinc 2600 2600 2500 103 102 85-115 0.862 20 <br />Surrogate Recovery <br />Terbium 2600 2500 2500 103 101 70-130 1.96 20 <br />CA ELAP 1644 • NELAP 4033ORELAP <br />Page 27 of 34