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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 13:08 <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\B0155-EPA 6010B <br /> Blank(A\B0155-BLK1) Prepared:02/15/18 Analyzed:02/16/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\B0155-BS1) Prepared:02/15/18 Analyzed:02/16/18 <br /> Arsenic 92.0 1.0 mg/kg 100 92.0 80-120 <br /> Copper 95.0 2.0 100 95.0 80-120 <br /> Lead 93.8 1.0 100 93.8 80-120 <br /> LCS Dup(A\B0155-BSD1) Prepared:02/15/18 Analyzed:02/16/18 <br /> Arsenic 93.4 1.0 mg/kg 100 93.4 80-120 1.59 25 <br /> Copper 94.8 2.0 100 94.8 80-120 0.179 25 <br /> Lead 94.8 1.0 100 94.8 80-120 1.06 25 <br /> Matrix Spike(A\B0155-MSI) Source:1802097-01 Prepared:02/15/18 Analyzed:02/19/18 <br /> Arsenic 98.5 1.0 mg/kg 100 0.960 97.6 75-125 <br /> Copper 169 2.0 100 84.9 84.3 75-125 <br /> Lead 81.8 1.0 100 1.00 80.8 75-125 <br /> Matrix Spike Dup(A\B0155-MSD1) Source:1802097-01 Prepared:02/15/18 Analyzed:02/19/18 <br /> Arsenic 99.5 1.0 mg/kg 100 0.960 98.5 75-125 0.949 25 <br /> Copper 170 2.0 100 84.9 85.6 75-125 0.765 25 <br /> Lead 83.2 1.0 100 1.00 82.2 75-125 1.62 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 />