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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 17:49 <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 AW0056-EPA 6010B <br /> Blank(A\F0056-BLK1) Prepared:06/07/18 Analyzed:06/08/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\F0056-BS1) Prepared:06/07/18 Analyzed:06/08/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 <br /> Copper 102 2.0 100 102 80-120 <br /> Lead 102 1.0 100 102 80-120 <br /> LCS Dup(A\F0056-BSD1) Prepared:06/07/18 Analyzed:06/08/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 0.0993 25 <br /> Copper 101 2.0 100 101 80-120 0.691 25 <br /> Lead 101 1.0 100 101 80-120 0.591 25 <br /> Matrix Spike(A\F0056-MS1) Source:1806034-01 Prepared:06/07/18 Analyzed:06/08/18 <br /> Arsenic 132 1.0 mg/kg 100 33.6 98.0 75-125 <br /> Copper 296 2.0 100 208 88.2 75-125 <br /> Lead 171 1.0 100 91.2 80.1 75-125 <br /> Matrix Spike Dup(A\F0056-MSD1) Source:1806034-01 Prepared:06/07/18 Analyzed:06/08/18 <br /> Arsenic 131 1.0 mg/kg 100 33.6 97.5 75-125 0.381 25 <br /> Copper 294 2.0 100 208 86.8 75-125 0.475 25 <br /> Lead 169 1.0 100 91.2 78.1 75-125 1.17 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 />