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Excelchem Environmental Labs <br /> DTE Stockton,LLC Project: Ash <br /> 2526 W.Washington St. Project Number: [none] Date Reported: <br /> Stockton,CA 95203 Project Manager: Dan Crawford 02/22/18 13:14 <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\B0160-EPA 6010B <br /> Blank(A\B0160-BLK1) Prepared&Analyzed:02/16/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\B0160-BS1) Prepared&Analyzed:02/16/18 <br /> Arsenic 94.5 1.0 mg/kg 100 94.5 80-120 <br /> Copper 94.7 2.0 100 94.7 80-120 <br /> Lead 95.2 1.0 100 95.2 80-120 <br /> LCS Dup(A\B0160-BSD1) Prepared&Analyzed:02/16/18 <br /> Arsenic 94.9 1.0 mg/kg 100 94.9 80-120 0.412 25 <br /> Copper 94.6 2.0 100 94.6 80-120 0.148 25 <br /> Lead 95.5 1.0 100 95.5 80-120 0.252 25 <br /> Matrix Spike(A\B0160-MS1) Source:1802106-01 Prepared&Analyzed:02/16/18 <br /> Arsenic 88.1 1.0 mg/kg 100 0.958 87.1 75-125 <br /> Copper 110 2.0 100 24.2 86.3 75-125 <br /> Lead 98.9 1.0 100 20.6 78.3 75-125 <br /> Matrix Spike Dup(A\B0160-MSD1) Source:1802106-01 Prepared&Analyzed:02/16/18 <br /> Arsenic 85.0 1.0 mg/kg 100 0.958 84.0 75-125 3.58 25 <br /> Copper 109 2.0 100 24.2 84.4 75-125 1.73 25 <br /> Lead 92.3 1.0 100 20.6 71.7 75-125 6.94 25 QM-01 <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 />