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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2020 Annual Bottom Ash Profiling <br /> 2526 W.Washington St. Project Number: 4700995195 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/10/20 21:46 <br /> STLC Analysis-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AAD0067-EPA 6010B <br /> Blank(AAD0067-BLK1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(AAD0067-BS1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.0 0.2 mg/L 20.0 110 80-120 <br /> Copper 18.3 0.4 20.0 91.4 80-120 <br /> Lead 18.6 0.2 20.0 93.1 80-120 <br /> LCS Dup(AAD0067-BSD1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.3 0.2 mg/L 20.0 111 80-120 1.26 25 <br /> Copper 18.1 0.4 20.0 90.4 80-120 0.990 25 <br /> Lead 18.8 0.2 20.0 93.8 80-120 0.749 25 <br /> Matrix Spike(AAD0067-MS1) Source:2004043-02 Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.4 0.2 mg/L 20.0 0.272 111 75-125 <br /> Copper 20.7 0.4 20.0 2.36 91.6 80-120 <br /> Lead 18.7 0.2 20.0 0.0606 93.0 75-125 <br /> Matrix Spike Dup(AAD0067-MSD1) Source:2004043-02 Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.4 0.2 mg/L 20.0 0.272 111 75-125 0.0891 25 <br /> Copper 20.8 0.4 20.0 2.36 92.2 80-120 0.627 25 <br /> Lead 18.6 0.2 20.0 0.0606 92.9 75-125 0.161 25 <br /> Excelchem Laboratories.inc. 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 16 of 19 <br />