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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 16:21 <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]D0093-EPA 6010B <br /> LCS Dup(A]D0093-BSD1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 19.8 2.0 mg/L 20.0 99.0 80-120 15.6 25 <br /> Arsenic 23.6 0.2 20.0 118 80-120 16.3 25 <br /> Barium 22.7 0.4 20.0 114 80-120 14.4 25 <br /> Beryllium 23.0 0.1 20.0 115 80-120 15.8 25 <br /> Cadmium 23.8 0.2 20.0 119 80-120 16.6 25 <br /> Chromium 23.4 0.2 20.0 117 80-120 16.7 25 <br /> Cobalt 22.4 1.0 20.0 112 80-120 16.5 25 <br /> Copper 22.3 0.4 20.0 111 80-120 17.0 25 <br /> Lead 21.7 0.2 20.0 108 80-120 16.9 25 <br /> Molybdenum 23.7 0.2 20.0 119 80-120 16.6 25 <br /> Nickel 22.5 0.2 20.0 112 80-120 16.6 25 <br /> Selenium 22.4 0.4 20.0 112 80-120 16.0 25 <br /> Silver 20.7 0.4 20.0 104 80-120 15.3 25 <br /> Thallium 20.2 0.4 20.0 101 80-120 16.6 25 <br /> Vanadium 21.2 0.4 20.0 106 80-120 16.6 25 <br /> Zinc 23.7 0.4 20.0 118 80-120 16.8 25 <br /> Matrix Spike(A]D0093-MS1) Source:1904046-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 20.5 2.0 mg/L 20.0 0.183 102 75-125 <br /> Arsenic 25.6 0.2 20.0 1.36 121 75-125 <br /> Barium 27.9 0.4 20.0 5.10 114 75-125 <br /> Beryllium 23.5 0.1 20.0 0.003 118 75-125 <br /> Cadmium 24.6 0.2 20.0 0.084 122 75-125 <br /> Chromium 24.4 0.2 20.0 0.605 119 75-125 <br /> Cobalt 22.6 1.0 20.0 0.060 113 75-125 <br /> Copper 24.8 0.4 20.0 2.04 114 75-125 <br /> Lead 22.7 0.2 20.0 0.752 110 75-125 <br /> Molybdenum 24.4 0.2 20.0 0.137 121 75-125 <br /> Nickel 22.7 0.2 20.0 0.295 112 75-125 <br /> Selenium 22.5 0.4 20.0 0.329 111 75-125 <br /> Silver 20.7 0.4 20.0 0.100 103 75-125 <br /> Thallium 20.5 0.4 20.0 ND 103 75-125 <br /> Vanadium 21.7 0.4 20.0 0.209 107 75-125 <br /> Zinc 32.7 0.4 20.0 9.26 117 75-125 <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 17 <br />