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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 02/21/18 17:37 <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\B0208-EPA 6010B <br /> Blank(A\B0208-BLK1) Prepared&Analyzed:02/20/18 <br /> Arsenic ND 1.0 mg/kg <br /> Copper ND 2.0 <br /> Lead ND 1.0 <br /> LCS(A\B0208-BS1) Prepared&Analyzed:02/20/18 <br /> Arsenic 102 1.0 mg/kg 100 102 80-120 <br /> Copper 100 2.0 100 100 80-120 <br /> Lead 101 1.0 100 101 80-120 <br /> LCS Dup(A\B0208-BSD1) Prepared&Analyzed:02/20/18 <br /> Arsenic 102 1.0 mg/kg 100 102 80-120 0.0979 25 <br /> Copper 99.0 2.0 100 99.0 80-120 1.13 25 <br /> Lead 101 1.0 100 101 80-120 0.00 25 <br /> Matrix Spike(A\B0208-MS1) Source:1802122-01 Prepared&Analyzed:02/20/18 <br /> Arsenic 105 1.0 mg/kg 100 0.393 105 75-125 <br /> Copper 131 2.0 100 46.5 84.9 75-125 <br /> Lead 91.0 1.0 100 1.45 89.6 75-125 <br /> Matrix Spike Dup(A\B0208-MSD1) Source:1802122-01 Prepared&Analyzed:02/20/18 <br /> Arsenic 105 1.0 mg/kg 100 0.393 105 75-125 0.00 25 <br /> Copper 152 2.0 100 46.5 105 75-125 14.3 25 <br /> Lead 90.4 1.0 100 1.45 89.0 75-125 0.661 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 />