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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 21:23 <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 AAD0066-EPA 6010B <br /> Blank(AAD0066-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(AAD0066-BS1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.1 0.2 mg/L 20.0 110 80-120 <br /> Copper 18.1 0.4 20.0 90.7 80-120 <br /> Lead 18.6 0.2 20.0 92.9 80-120 <br /> LCS Dup(AAD0066-BSD1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.3 0.2 mg/L 20.0 111 80-120 0.947 25 <br /> Copper 18.3 0.4 20.0 91.4 80-120 0.714 25 <br /> Lead 18.8 0.2 20.0 94.2 80-120 1.34 25 <br /> Matrix Spike(AAD0066-MS1) Source:2004044-02 Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.7 0.2 mg/L 20.0 0.286 112 75-125 <br /> Copper 21.0 0.4 20.0 2.50 92.5 80-120 <br /> Lead 18.9 0.2 20.0 0.0895 94.0 75-125 <br /> Matrix Spike Dup(AAD0066-MSD1) Source:2004044-02 Prepared:04/09/20 Analyzed:04/10/20 <br /> Arsenic 22.7 0.2 mg/L 20.0 0.286 112 75-125 0.0881 25 <br /> Copper 20.7 0.4 20.0 2.50 90.9 80-120 1.54 25 <br /> Lead 18.8 0.2 20.0 0.0895 93.6 75-125 0.478 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 />