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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 02/22/18 17:35 <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 A\B0226-EPA 6010B <br /> Blank(A\B0226-BLK1) Prepared:02/21/18 Analyzed:02/22/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\B0226-BS1) Prepared:02/21/18 Analyzed:02/22/18 <br /> Arsenic 101 1.0 mg/kg 100 101 80-120 <br /> Copper 104 2.0 100 104 80-120 <br /> Lead 102 1.0 100 102 80-120 <br /> LCS Dup(A\B0226-BSD1) Prepared:02/21/18 Analyzed:02/22/18 <br /> Arsenic 99.8 1.0 mg/kg 100 99.8 80-120 0.928 25 <br /> Copper 103 2.0 100 103 80-120 0.580 25 <br /> Lead 101 1.0 100 101 80-120 0.888 25 <br /> Matrix Spike(A\B0226-MSI) Source:1802153-01 Prepared:02/21/18 Analyzed:02/22/18 <br /> Arsenic 102 1.0 mg/kg 100 1.24 101 75-125 <br /> Copper 154 2.0 100 46.1 108 75-125 <br /> Lead 89.2 1.0 100 1.34 87.9 75-125 <br /> Matrix Spike Dup(A\B0226-MSD1) Source:1802153-01 Prepared:02/21/18 Analyzed:02/22/18 <br /> Arsenic 99.3 1.0 mg/kg 100 1.24 98.1 75-125 2.84 25 <br /> Copper 144 2.0 100 46.1 97.9 75-125 6.58 25 <br /> Lead 86.5 1.0 100 1.34 85.2 75-125 3.03 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 6 of <br />