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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 06/13/18 16:18 <br /> Total Recoverable Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AW0067-EPA 6010B <br /> Blank(A\F0067-BLK1) Prepared:06/08/18 Analyzed:06/11/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\F0067-BS1) Prepared:06/08/18 Analyzed:06/11/18 <br /> Arsenic 97.1 1.0 mg/kg 100 97.1 80-120 <br /> Copper 101 2.0 100 101 80-120 <br /> Lead 102 1.0 100 102 80-120 <br /> LCS Dup(A\F0067-BSD1) Prepared:06/08/18 Analyzed:06/11/18 <br /> Arsenic 95.7 1.0 mg/kg 100 95.7 80-120 1.51 25 <br /> Copper 103 2.0 100 103 80-120 1.47 25 <br /> Lead 101 1.0 100 101 80-120 1.28 25 <br /> Matrix Spike(A\F0067-MS1) Source:1806052-01 Prepared:06/08/18 Analyzed:06/11/18 <br /> Arsenic 109 1.0 mg/kg 100 6.41 102 75-125 <br /> Copper 177 2.0 100 179 NR 75-125 QM-01 <br /> Lead 102 1.0 100 6.10 95.4 75-125 <br /> Matrix Spike Dup(A\F0067-MSDI) Source:1806052-01 Prepared:06/08/18 Analyzed:06/11/18 <br /> Arsenic 105 1.0 mg/kg 100 6.41 98.8 75-125 3.18 25 <br /> Copper 138 2.0 100 179 NR 75-125 24.7 25 QM-01 <br /> Lead 98.8 1.0 100 6.10 92.7 75-125 2.71 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 4of7 <br />