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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 15:59 <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 AW0029-EPA 6010B <br /> Blank(A\F0029-BLK1) Prepared&Analyzed:06/05/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\F0029-BS1) Prepared&Analyzed:06/05/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 <br /> Copper 100 2.0 100 100 80-120 <br /> Lead 101 1.0 100 101 80-120 <br /> LCS Dup(A\F0029-BSD1) Prepared&Analyzed:06/05/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 0.396 25 <br /> Copper 100 2.0 100 100 80-120 0.00 25 <br /> Lead 100 1.0 100 100 80-120 0.299 25 <br /> Matrix Spike(A\F0029-MS1) Source:1806007-01 Prepared&Analyzed:06/05/18 <br /> Arsenic 103 1.0 mg/kg 100 4.01 99.1 75-125 <br /> Copper 211 2.0 100 83.5 128 75-125 QM-01 <br /> Lead 102 1.0 100 13.9 87.8 75-125 <br /> Matrix Spike Dup(A\F0029-MSD1) Source:1806007-01 Prepared&Analyzed:06/05/18 <br /> Arsenic 104 1.0 mg/kg 100 4.01 100 75-125 0.965 25 <br /> Copper 243 2.0 100 83.5 159 75-125 13.9 25 QM-01 <br /> Lead 99.6 1.0 100 13.9 85.7 75-125 2.10 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 />