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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: #4701180998 Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 06/08/18 16:00 <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 AT0052-EPA 6010B <br /> Blank(A\F0052-BLK1) Prepared&Analyzed:06/07/18 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A\F0052-BS1) Prepared&Analyzed:06/07/18 <br /> Arsenic 20.0 0.2 mg/L 20.0 100 80-120 <br /> Copper 20.8 0.4 20.0 104 80-120 <br /> Lead 20.0 0.2 20.0 99.8 80-120 <br /> LCS Dup(A\F0052-BSDI) Prepared&Analyzed:06/07/18 <br /> Arsenic 19.9 0.2 mg/L 20.0 99.6 80-120 0.501 25 <br /> Copper 21.0 0.4 20.0 105 80-120 0.718 25 <br /> Lead 19.9 0.2 20.0 99.4 80-120 0.352 25 <br /> Matrix Spike(A\F0052-MS1) Source:1806019-01 Prepared&Analyzed:06/07/18 <br /> Arsenic 23.1 0.2 mg/L 20.0 0.324 114 75-125 <br /> Copper 27.7 0.4 20.0 4.32 117 80-120 <br /> Lead 18.0 0.2 20.0 0.284 88.8 75-125 <br /> Matrix Spike Dup(A\F0052-MSD1) Source:1806019-01 Prepared&Analyzed:06/07/18 <br /> Arsenic 23.2 0.2 mg/L 20.0 0.324 114 75-125 0.346 25 <br /> Copper 27.5 0.4 20.0 4.32 116 80-120 0.725 25 <br /> Lead 18.2 0.2 20.0 0.284 89.4 75-125 0.663 25 <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 5 of <br />