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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 06/12/18 17:42 <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 AT0086-EPA 6010B <br /> Blank(A\F0086-BLK1) Prepared:06/11/18 Analyzed:06/12/18 <br /> Arsenic ND 0.2 mg/L <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> LCS(A\F0086-BS1) Prepared:06/11/18 Analyzed:06/12/18 <br /> Arsenic 20.5 0.2 mg/L 20.0 102 80-120 <br /> Copper 19.5 0.4 20.0 97.6 80-120 <br /> Lead 19.8 0.2 20.0 98.9 80-120 <br /> LCS Dup(A\F0086-BSDI) Prepared:06/11/18 Analyzed:06/12/18 <br /> Arsenic 20.3 0.2 mg/L 20.0 102 80-120 0.980 25 <br /> Copper 19.5 0.4 20.0 97.4 80-120 0.256 25 <br /> Lead 19.7 0.2 20.0 98.4 80-120 0.558 25 <br /> Matrix Spike(A\F0086-MS1) Source:1806033-01 Prepared:06/11/18 Analyzed:06/12/18 <br /> Arsenic 22.5 0.2 mg/L 20.0 0.321 111 75-125 <br /> Copper 20.5 0.4 20.0 1.99 92.7 80-120 <br /> Lead 18.3 0.2 20.0 0.0267 91.4 75-125 <br /> Matrix Spike Dup(A\F0086-MSD1) Source:1806033-01 Prepared:06/11/18 Analyzed:06/12/18 <br /> Arsenic 22.4 0.2 mg/L 20.0 0.321 110 75-125 0.401 25 <br /> Copper 20.4 0.4 20.0 1.99 92.3 80-120 0.390 25 <br /> Lead 18.2 0.2 20.0 0.0267 90.8 75-125 0.658 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 />