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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2019 Annual Fly Ash Profiling <br /> 2526 W.Washington St. Project Number: 4701254256 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/12/19 16:16 <br /> STLC Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch A]D0092-EPA 6010B <br /> Matrix Spike Dup(A]D0092-MSD1) Source:1904030-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 21.6 2.0 mg/L 20.0 0.046 108 75-125 4.58 25 <br /> Arsenic 22.5 0.2 20.0 0.322 111 75-125 4.78 25 <br /> Barium 24.6 0.4 20.0 4.39 101 75-125 0.652 25 <br /> Beryllium 20.5 0.1 20.0 0.004 102 75-125 4.85 25 <br /> Cadmium 21.0 0.2 20.0 0.010 105 75-125 4.39 25 <br /> Chromium 20.8 0.2 20.0 0.370 102 75-125 4.38 25 <br /> Cobalt 19.4 1.0 20.0 0.076 96.8 75-125 3.99 25 <br /> Copper 20.9 0.4 20.0 1.48 97.1 75-125 4.85 25 <br /> Lead 18.9 0.2 20.0 0.120 93.9 75-125 4.05 25 <br /> Molybdenum 21.2 0.2 20.0 0.084 105 75-125 4.10 25 <br /> Nickel 19.5 0.2 20.0 0.322 95.8 75-125 4.09 25 <br /> Selenium 22.0 0.4 20.0 0.192 109 75-125 4.03 25 <br /> Silver 18.4 0.4 20.0 0.084 91.8 75-125 0.326 25 <br /> Thallium 17.5 0.4 20.0 ND 87.4 75-125 4.44 25 <br /> Vanadium 19.1 0.4 20.0 0.408 93.5 75-125 5.04 25 <br /> Zinc 21.8 0.4 20.0 1.72 100 75-125 4.03 25 <br /> Batch A]D0106-EPA 7470A <br /> Blank(A]D0106-BLK1) Prepared:04/11/19 Analyzed:04/12/19 <br /> Mercury ND 0.00240 mg/L <br /> LCS(A]D0106-BS1) Prepared:04/11/19 Analyzed:04/12/19 <br /> Mercury 0.0338 0.00240 mg/L 0.0400 84.4 75-120 <br /> LCS Dup(A]D0106-BSD1) Prepared:04/11/19 Analyzed:04/12/19 <br /> Mercury 0.0334 0.00240 mg/L 0.0400 83.6 75-120 0.952 20 <br /> Excelchem Environmental Lab. 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 14 of 18 <br />