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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: Scrubber Ball Profile <br /> 2526 W.Washington St. Project Number: 4700995195 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffman 01/25/2108:41 <br /> Total Recoverable Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AAJ0284-EPA 6010B <br /> Matrix Spike Dup(AAJ0284-MSD1) Source:2010157-01 Prepared&Analyzed: 10/26/20 <br /> Antimony 32.7 0.5 mg/kg 100 1.64 31.0 75-125 8.15 25 QM-01 <br /> Arsenic 86.3 0.5 100 1.36 85.0 75-125 0.531 25 <br /> Barium 235 0.5 100 156 79.4 75-125 6.02 25 <br /> Beryllium 84.6 0.5 100 ND 84.6 75-125 0.707 25 <br /> Cadmium 85.8 0.5 100 ND 85.8 75-125 0.893 25 <br /> Chromium 112 0.5 100 26.6 85.5 75-125 2.99 25 <br /> Cobalt 90.2 0.5 100 9.62 80.6 75-125 2.41 25 <br /> Copper 95.0 0.5 100 13.3 81.7 75-125 2.81 25 <br /> Lead 83.6 0.5 100 3.71 79.9 75-125 0.940 25 <br /> Molybdenum 78.9 0.5 100 ND 78.9 75-125 0.955 25 <br /> Nickel 96.5 0.5 100 16.2 80.2 75-125 2.61 25 <br /> Selenium 79.1 0.5 100 ND 79.1 75-125 0.342 25 <br /> Silver 81.5 0.5 100 ND 81.5 75-125 0.0982 25 <br /> Thallium 75.3 0.5 100 ND 75.3 75-125 0.0797 25 <br /> Vanadium 136 0.5 100 55.6 80.1 75-125 5.87 25 <br /> Zinc 115 0.5 100 34.7 79.9 75-125 4.19 25 <br /> Batch A'J0292-EPA 7471A <br /> Blank(A^J0292-BLK1) Prepared&Analyzed: 10/26/20 <br /> Mercury ND 0.016 mg/kg <br /> LCS(A-J0292-BS1) Prepared&Analyzed: 10/26/20 <br /> Mercury 0.203 0.016 mg/kg 0.200 102 80-120 <br /> LCS Dup(A A J0292-BSD1) Prepared&Analyzed: 10/26/20 <br /> Mercury 0.199 0.016 mg/kg 0.200 99.6 80-120 1.99 20 <br /> Excelchem Laboratories.Tnc. The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Laboratory Representative Page 6 of 10 <br />