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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 /> Blank(A]D0092-BLK1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony ND 2.0 mg/L <br /> Arsenic ND 0.2 <br /> Barium ND 0.4 <br /> Beryllium ND 0.1 <br /> Cadmium ND 0.2 <br /> Chromium ND 0.2 <br /> Cobalt ND 1.0 <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> Molybdenum ND 0.2 <br /> Nickel ND 0.2 <br /> Selenium ND 0.4 <br /> Silver ND 0.4 <br /> Thallium ND 0.4 <br /> Vanadium ND 0.4 <br /> Zinc ND 0.4 <br /> LCS(A]D0092-BS1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 21.1 2.0 mg/L 20.0 106 80-120 <br /> Arsenic 21.7 0.2 20.0 109 80-120 <br /> Barium 20.2 0.4 20.0 101 80-120 <br /> Beryllium 19.9 0.1 20.0 99.7 80-120 <br /> Cadmium 20.3 0.2 20.0 102 80-120 <br /> Chromium 20.0 0.2 20.0 99.9 80-120 <br /> Cobalt 19.1 1.0 20.0 95.3 80-120 <br /> Copper 18.8 0.4 20.0 93.8 80-120 <br /> Lead 18.4 0.2 20.0 91.9 80-120 <br /> Molybdenum 20.7 0.2 20.0 104 80-120 <br /> Nickel 19.1 0.2 20.0 95.7 80-120 <br /> Selenium 22.0 0.4 20.0 110 80-120 <br /> Silver 18.2 0.4 20.0 91.1 80-120 <br /> Thallium 17.0 0.4 20.0 85.0 80-120 <br /> Vanadium 18.2 0.4 20.0 90.8 80-120 <br /> Zinc 20.1 0.4 20.0 101 80-120 <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 12 of 18 <br />